1 /*- 2 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 3 * Copyright (c) 1992 Terrence R. Lambert. 4 * Copyright (c) 2003 Peter Wemm. 5 * Copyright (c) 2008 The DragonFly Project. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 40 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $ 41 */ 42 43 //#include "use_npx.h" 44 #include "use_isa.h" 45 #include "opt_cpu.h" 46 #include "opt_ddb.h" 47 #include "opt_directio.h" 48 #include "opt_inet.h" 49 #include "opt_msgbuf.h" 50 #include "opt_swap.h" 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/sysproto.h> 55 #include <sys/signalvar.h> 56 #include <sys/kernel.h> 57 #include <sys/linker.h> 58 #include <sys/malloc.h> 59 #include <sys/proc.h> 60 #include <sys/priv.h> 61 #include <sys/buf.h> 62 #include <sys/reboot.h> 63 #include <sys/mbuf.h> 64 #include <sys/msgbuf.h> 65 #include <sys/sysent.h> 66 #include <sys/sysctl.h> 67 #include <sys/vmmeter.h> 68 #include <sys/bus.h> 69 #include <sys/usched.h> 70 #include <sys/reg.h> 71 #include <sys/sbuf.h> 72 #include <sys/ctype.h> 73 #include <sys/serialize.h> 74 #include <sys/systimer.h> 75 76 #include <vm/vm.h> 77 #include <vm/vm_param.h> 78 #include <sys/lock.h> 79 #include <vm/vm_kern.h> 80 #include <vm/vm_object.h> 81 #include <vm/vm_page.h> 82 #include <vm/vm_map.h> 83 #include <vm/vm_pager.h> 84 #include <vm/vm_extern.h> 85 86 #include <sys/thread2.h> 87 #include <sys/mplock2.h> 88 #include <sys/mutex2.h> 89 90 #include <sys/user.h> 91 #include <sys/exec.h> 92 #include <sys/cons.h> 93 94 #include <sys/efi.h> 95 96 #include <ddb/ddb.h> 97 98 #include <machine/cpu.h> 99 #include <machine/clock.h> 100 #include <machine/specialreg.h> 101 #if 0 /* JG */ 102 #include <machine/bootinfo.h> 103 #endif 104 #include <machine/md_var.h> 105 #include <machine/metadata.h> 106 #include <machine/pc/bios.h> 107 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 108 #include <machine/globaldata.h> /* CPU_prvspace */ 109 #include <machine/smp.h> 110 #include <machine/cputypes.h> 111 #include <machine/intr_machdep.h> 112 #include <machine/framebuffer.h> 113 114 #ifdef OLD_BUS_ARCH 115 #include <bus/isa/isa_device.h> 116 #endif 117 #include <machine_base/isa/isa_intr.h> 118 #include <bus/isa/rtc.h> 119 #include <sys/random.h> 120 #include <sys/ptrace.h> 121 #include <machine/sigframe.h> 122 123 #include <sys/machintr.h> 124 #include <machine_base/icu/icu_abi.h> 125 #include <machine_base/icu/elcr_var.h> 126 #include <machine_base/apic/lapic.h> 127 #include <machine_base/apic/ioapic.h> 128 #include <machine_base/apic/ioapic_abi.h> 129 #include <machine/mptable.h> 130 131 #define PHYSMAP_ENTRIES 10 132 133 extern u_int64_t hammer_time(u_int64_t, u_int64_t); 134 135 extern void printcpuinfo(void); /* XXX header file */ 136 extern void identify_cpu(void); 137 #if 0 /* JG */ 138 extern void finishidentcpu(void); 139 #endif 140 extern void panicifcpuunsupported(void); 141 142 static void cpu_startup(void *); 143 static void pic_finish(void *); 144 static void cpu_finish(void *); 145 146 static void set_fpregs_xmm(struct save87 *, struct savexmm *); 147 static void fill_fpregs_xmm(struct savexmm *, struct save87 *); 148 #ifdef DIRECTIO 149 extern void ffs_rawread_setup(void); 150 #endif /* DIRECTIO */ 151 static void init_locks(void); 152 153 extern void pcpu_timer_always(struct intrframe *); 154 155 SYSINIT(cpu, SI_BOOT2_START_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 156 SYSINIT(pic_finish, SI_BOOT2_FINISH_PIC, SI_ORDER_FIRST, pic_finish, NULL); 157 SYSINIT(cpu_finish, SI_BOOT2_FINISH_CPU, SI_ORDER_FIRST, cpu_finish, NULL); 158 159 #ifdef DDB 160 extern vm_offset_t ksym_start, ksym_end; 161 #endif 162 163 struct privatespace CPU_prvspace_bsp __aligned(4096); 164 struct privatespace *CPU_prvspace[MAXCPU] = { &CPU_prvspace_bsp }; 165 166 int _udatasel, _ucodesel, _ucode32sel; 167 u_long atdevbase; 168 int64_t tsc_offsets[MAXCPU]; 169 cpumask_t smp_idleinvl_mask; 170 cpumask_t smp_idleinvl_reqs; 171 172 static int cpu_mwait_halt_global; /* MWAIT hint (EAX) or CPU_MWAIT_HINT_ */ 173 174 #if defined(SWTCH_OPTIM_STATS) 175 extern int swtch_optim_stats; 176 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 177 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 178 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 179 CTLFLAG_RD, &tlb_flush_count, 0, ""); 180 #endif 181 SYSCTL_INT(_hw, OID_AUTO, cpu_mwait_halt, 182 CTLFLAG_RD, &cpu_mwait_halt_global, 0, ""); 183 SYSCTL_INT(_hw, OID_AUTO, cpu_mwait_spin, CTLFLAG_RD, &cpu_mwait_spin, 0, 184 "monitor/mwait target state"); 185 186 #define CPU_MWAIT_HAS_CX \ 187 ((cpu_feature2 & CPUID2_MON) && \ 188 (cpu_mwait_feature & CPUID_MWAIT_EXT)) 189 190 #define CPU_MWAIT_CX_NAMELEN 16 191 192 #define CPU_MWAIT_C1 1 193 #define CPU_MWAIT_C2 2 194 #define CPU_MWAIT_C3 3 195 #define CPU_MWAIT_CX_MAX 8 196 197 #define CPU_MWAIT_HINT_AUTO -1 /* C1 and C2 */ 198 #define CPU_MWAIT_HINT_AUTODEEP -2 /* C3+ */ 199 200 SYSCTL_NODE(_machdep, OID_AUTO, mwait, CTLFLAG_RW, 0, "MWAIT features"); 201 SYSCTL_NODE(_machdep_mwait, OID_AUTO, CX, CTLFLAG_RW, 0, "MWAIT Cx settings"); 202 203 struct cpu_mwait_cx { 204 int subcnt; 205 char name[4]; 206 struct sysctl_ctx_list sysctl_ctx; 207 struct sysctl_oid *sysctl_tree; 208 }; 209 static struct cpu_mwait_cx cpu_mwait_cx_info[CPU_MWAIT_CX_MAX]; 210 static char cpu_mwait_cx_supported[256]; 211 212 static int cpu_mwait_c1_hints_cnt; 213 static int cpu_mwait_hints_cnt; 214 static int *cpu_mwait_hints; 215 216 static int cpu_mwait_deep_hints_cnt; 217 static int *cpu_mwait_deep_hints; 218 219 #define CPU_IDLE_REPEAT_DEFAULT 750 220 221 static u_int cpu_idle_repeat = CPU_IDLE_REPEAT_DEFAULT; 222 static u_long cpu_idle_repeat_max = CPU_IDLE_REPEAT_DEFAULT; 223 static u_int cpu_mwait_repeat_shift = 1; 224 225 #define CPU_MWAIT_C3_PREAMBLE_BM_ARB 0x1 226 #define CPU_MWAIT_C3_PREAMBLE_BM_STS 0x2 227 228 static int cpu_mwait_c3_preamble = 229 CPU_MWAIT_C3_PREAMBLE_BM_ARB | 230 CPU_MWAIT_C3_PREAMBLE_BM_STS; 231 232 SYSCTL_STRING(_machdep_mwait_CX, OID_AUTO, supported, CTLFLAG_RD, 233 cpu_mwait_cx_supported, 0, "MWAIT supported C states"); 234 SYSCTL_INT(_machdep_mwait_CX, OID_AUTO, c3_preamble, CTLFLAG_RD, 235 &cpu_mwait_c3_preamble, 0, "C3+ preamble mask"); 236 237 static int cpu_mwait_cx_select_sysctl(SYSCTL_HANDLER_ARGS, 238 int *, boolean_t); 239 static int cpu_mwait_cx_idle_sysctl(SYSCTL_HANDLER_ARGS); 240 static int cpu_mwait_cx_pcpu_idle_sysctl(SYSCTL_HANDLER_ARGS); 241 static int cpu_mwait_cx_spin_sysctl(SYSCTL_HANDLER_ARGS); 242 243 SYSCTL_PROC(_machdep_mwait_CX, OID_AUTO, idle, CTLTYPE_STRING|CTLFLAG_RW, 244 NULL, 0, cpu_mwait_cx_idle_sysctl, "A", ""); 245 SYSCTL_PROC(_machdep_mwait_CX, OID_AUTO, spin, CTLTYPE_STRING|CTLFLAG_RW, 246 NULL, 0, cpu_mwait_cx_spin_sysctl, "A", ""); 247 SYSCTL_UINT(_machdep_mwait_CX, OID_AUTO, repeat_shift, CTLFLAG_RW, 248 &cpu_mwait_repeat_shift, 0, ""); 249 250 long physmem = 0; 251 252 u_long ebda_addr = 0; 253 254 int imcr_present = 0; 255 256 int naps = 0; /* # of Applications processors */ 257 258 u_int base_memory; 259 struct mtx dt_lock; /* lock for GDT and LDT */ 260 261 static int 262 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 263 { 264 u_long pmem = ctob(physmem); 265 266 int error = sysctl_handle_long(oidp, &pmem, 0, req); 267 return (error); 268 } 269 270 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD, 271 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)"); 272 273 static int 274 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 275 { 276 int error = sysctl_handle_int(oidp, 0, 277 ctob(physmem - vmstats.v_wire_count), req); 278 return (error); 279 } 280 281 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 282 0, 0, sysctl_hw_usermem, "IU", ""); 283 284 static int 285 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS) 286 { 287 int error = sysctl_handle_int(oidp, 0, 288 x86_64_btop(avail_end - avail_start), req); 289 return (error); 290 } 291 292 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 293 0, 0, sysctl_hw_availpages, "I", ""); 294 295 vm_paddr_t Maxmem; 296 vm_paddr_t Realmem; 297 298 /* 299 * The number of PHYSMAP entries must be one less than the number of 300 * PHYSSEG entries because the PHYSMAP entry that spans the largest 301 * physical address that is accessible by ISA DMA is split into two 302 * PHYSSEG entries. 303 */ 304 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1)) 305 306 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2]; 307 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2]; 308 309 /* must be 2 less so 0 0 can signal end of chunks */ 310 #define PHYS_AVAIL_ARRAY_END (NELEM(phys_avail) - 2) 311 #define DUMP_AVAIL_ARRAY_END (NELEM(dump_avail) - 2) 312 313 static vm_offset_t buffer_sva, buffer_eva; 314 vm_offset_t clean_sva, clean_eva; 315 static vm_offset_t pager_sva, pager_eva; 316 static struct trapframe proc0_tf; 317 318 static void 319 cpu_startup(void *dummy) 320 { 321 caddr_t v; 322 vm_size_t size = 0; 323 vm_offset_t firstaddr; 324 325 /* 326 * Good {morning,afternoon,evening,night}. 327 */ 328 kprintf("%s", version); 329 startrtclock(); 330 printcpuinfo(); 331 panicifcpuunsupported(); 332 kprintf("real memory = %ju (%ju MB)\n", 333 (intmax_t)Realmem, 334 (intmax_t)Realmem / 1024 / 1024); 335 /* 336 * Display any holes after the first chunk of extended memory. 337 */ 338 if (bootverbose) { 339 int indx; 340 341 kprintf("Physical memory chunk(s):\n"); 342 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 343 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx]; 344 345 kprintf("0x%08jx - 0x%08jx, %ju bytes (%ju pages)\n", 346 (intmax_t)phys_avail[indx], 347 (intmax_t)phys_avail[indx + 1] - 1, 348 (intmax_t)size1, 349 (intmax_t)(size1 / PAGE_SIZE)); 350 } 351 } 352 353 /* 354 * Allocate space for system data structures. 355 * The first available kernel virtual address is in "v". 356 * As pages of kernel virtual memory are allocated, "v" is incremented. 357 * As pages of memory are allocated and cleared, 358 * "firstaddr" is incremented. 359 * An index into the kernel page table corresponding to the 360 * virtual memory address maintained in "v" is kept in "mapaddr". 361 */ 362 363 /* 364 * Make two passes. The first pass calculates how much memory is 365 * needed and allocates it. The second pass assigns virtual 366 * addresses to the various data structures. 367 */ 368 firstaddr = 0; 369 again: 370 v = (caddr_t)firstaddr; 371 372 #define valloc(name, type, num) \ 373 (name) = (type *)v; v = (caddr_t)((name)+(num)) 374 #define valloclim(name, type, num, lim) \ 375 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 376 377 /* 378 * The nominal buffer size (and minimum KVA allocation) is MAXBSIZE. 379 * For the first 64MB of ram nominally allocate sufficient buffers to 380 * cover 1/4 of our ram. Beyond the first 64MB allocate additional 381 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing 382 * the buffer cache we limit the eventual kva reservation to 383 * maxbcache bytes. 384 * 385 * factor represents the 1/4 x ram conversion. 386 */ 387 if (nbuf == 0) { 388 long factor = 4 * NBUFCALCSIZE / 1024; 389 long kbytes = physmem * (PAGE_SIZE / 1024); 390 391 nbuf = 50; 392 if (kbytes > 4096) 393 nbuf += min((kbytes - 4096) / factor, 65536 / factor); 394 if (kbytes > 65536) 395 nbuf += (kbytes - 65536) * 2 / (factor * 5); 396 if (maxbcache && nbuf > maxbcache / NBUFCALCSIZE) 397 nbuf = maxbcache / NBUFCALCSIZE; 398 } 399 400 /* 401 * Do not allow the buffer_map to be more then 1/2 the size of the 402 * kernel_map. 403 */ 404 if (nbuf > (virtual_end - virtual_start + 405 virtual2_end - virtual2_start) / (MAXBSIZE * 2)) { 406 nbuf = (virtual_end - virtual_start + 407 virtual2_end - virtual2_start) / (MAXBSIZE * 2); 408 kprintf("Warning: nbufs capped at %ld due to kvm\n", nbuf); 409 } 410 411 /* 412 * Do not allow the buffer_map to use more than 50% of available 413 * physical-equivalent memory. Since the VM pages which back 414 * individual buffers are typically wired, having too many bufs 415 * can prevent the system from paging properly. 416 */ 417 if (nbuf > physmem * PAGE_SIZE / (NBUFCALCSIZE * 2)) { 418 nbuf = physmem * PAGE_SIZE / (NBUFCALCSIZE * 2); 419 kprintf("Warning: nbufs capped at %ld due to physmem\n", nbuf); 420 } 421 422 /* 423 * Do not allow the sizeof(struct buf) * nbuf to exceed half of 424 * the valloc space which is just the virtual_end - virtual_start 425 * section. We use valloc() to allocate the buf header array. 426 */ 427 if (nbuf > (virtual_end - virtual_start) / sizeof(struct buf) / 2) { 428 nbuf = (virtual_end - virtual_start) / 429 sizeof(struct buf) / 2; 430 kprintf("Warning: nbufs capped at %ld due to valloc " 431 "considerations\n", nbuf); 432 } 433 434 nswbuf_mem = lmax(lmin(nbuf / 32, 512), 8); 435 #ifdef NSWBUF_MIN 436 if (nswbuf_mem < NSWBUF_MIN) 437 nswbuf_mem = NSWBUF_MIN; 438 #endif 439 nswbuf_kva = lmax(lmin(nbuf / 4, 512), 16); 440 #ifdef NSWBUF_MIN 441 if (nswbuf_kva < NSWBUF_MIN) 442 nswbuf_kva = NSWBUF_MIN; 443 #endif 444 #ifdef DIRECTIO 445 ffs_rawread_setup(); 446 #endif 447 448 valloc(swbuf_mem, struct buf, nswbuf_mem); 449 valloc(swbuf_kva, struct buf, nswbuf_kva); 450 valloc(buf, struct buf, nbuf); 451 452 /* 453 * End of first pass, size has been calculated so allocate memory 454 */ 455 if (firstaddr == 0) { 456 size = (vm_size_t)(v - firstaddr); 457 firstaddr = kmem_alloc(&kernel_map, round_page(size)); 458 if (firstaddr == 0) 459 panic("startup: no room for tables"); 460 goto again; 461 } 462 463 /* 464 * End of second pass, addresses have been assigned 465 * 466 * nbuf is an int, make sure we don't overflow the field. 467 * 468 * On 64-bit systems we always reserve maximal allocations for 469 * buffer cache buffers and there are no fragmentation issues, 470 * so the KVA segment does not have to be excessively oversized. 471 */ 472 if ((vm_size_t)(v - firstaddr) != size) 473 panic("startup: table size inconsistency"); 474 475 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva, 476 ((vm_offset_t)(nbuf + 16) * MAXBSIZE) + 477 ((nswbuf_mem + nswbuf_kva) * MAXPHYS) + pager_map_size); 478 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva, 479 ((vm_offset_t)(nbuf + 16) * MAXBSIZE)); 480 buffer_map.system_map = 1; 481 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva, 482 ((vm_offset_t)(nswbuf_mem + nswbuf_kva) * MAXPHYS) + 483 pager_map_size); 484 pager_map.system_map = 1; 485 kprintf("avail memory = %ju (%ju MB)\n", 486 (uintmax_t)ptoa(vmstats.v_free_count + vmstats.v_dma_pages), 487 (uintmax_t)ptoa(vmstats.v_free_count + vmstats.v_dma_pages) / 488 1024 / 1024); 489 } 490 491 struct cpu_idle_stat { 492 int hint; 493 int reserved; 494 u_long halt; 495 u_long spin; 496 u_long repeat; 497 u_long repeat_last; 498 u_long repeat_delta; 499 u_long mwait_cx[CPU_MWAIT_CX_MAX]; 500 } __cachealign; 501 502 #define CPU_IDLE_STAT_HALT -1 503 #define CPU_IDLE_STAT_SPIN -2 504 505 static struct cpu_idle_stat cpu_idle_stats[MAXCPU]; 506 507 static int 508 sysctl_cpu_idle_cnt(SYSCTL_HANDLER_ARGS) 509 { 510 int idx = arg2, cpu, error; 511 u_long val = 0; 512 513 if (idx == CPU_IDLE_STAT_HALT) { 514 for (cpu = 0; cpu < ncpus; ++cpu) 515 val += cpu_idle_stats[cpu].halt; 516 } else if (idx == CPU_IDLE_STAT_SPIN) { 517 for (cpu = 0; cpu < ncpus; ++cpu) 518 val += cpu_idle_stats[cpu].spin; 519 } else { 520 KASSERT(idx >= 0 && idx < CPU_MWAIT_CX_MAX, 521 ("invalid index %d", idx)); 522 for (cpu = 0; cpu < ncpus; ++cpu) 523 val += cpu_idle_stats[cpu].mwait_cx[idx]; 524 } 525 526 error = sysctl_handle_quad(oidp, &val, 0, req); 527 if (error || req->newptr == NULL) 528 return error; 529 530 if (idx == CPU_IDLE_STAT_HALT) { 531 for (cpu = 0; cpu < ncpus; ++cpu) 532 cpu_idle_stats[cpu].halt = 0; 533 cpu_idle_stats[0].halt = val; 534 } else if (idx == CPU_IDLE_STAT_SPIN) { 535 for (cpu = 0; cpu < ncpus; ++cpu) 536 cpu_idle_stats[cpu].spin = 0; 537 cpu_idle_stats[0].spin = val; 538 } else { 539 KASSERT(idx >= 0 && idx < CPU_MWAIT_CX_MAX, 540 ("invalid index %d", idx)); 541 for (cpu = 0; cpu < ncpus; ++cpu) 542 cpu_idle_stats[cpu].mwait_cx[idx] = 0; 543 cpu_idle_stats[0].mwait_cx[idx] = val; 544 } 545 return 0; 546 } 547 548 static void 549 cpu_mwait_attach(void) 550 { 551 struct sbuf sb; 552 int hint_idx, i; 553 554 if (!CPU_MWAIT_HAS_CX) 555 return; 556 557 if (cpu_vendor_id == CPU_VENDOR_INTEL && 558 (CPUID_TO_FAMILY(cpu_id) > 0xf || 559 (CPUID_TO_FAMILY(cpu_id) == 0x6 && 560 CPUID_TO_MODEL(cpu_id) >= 0xf))) { 561 int bm_sts = 1; 562 563 /* 564 * Pentium dual-core, Core 2 and beyond do not need any 565 * additional activities to enter deep C-state, i.e. C3(+). 566 */ 567 cpu_mwait_cx_no_bmarb(); 568 569 TUNABLE_INT_FETCH("machdep.cpu.mwait.bm_sts", &bm_sts); 570 if (!bm_sts) 571 cpu_mwait_cx_no_bmsts(); 572 } 573 574 sbuf_new(&sb, cpu_mwait_cx_supported, 575 sizeof(cpu_mwait_cx_supported), SBUF_FIXEDLEN); 576 577 for (i = 0; i < CPU_MWAIT_CX_MAX; ++i) { 578 struct cpu_mwait_cx *cx = &cpu_mwait_cx_info[i]; 579 int sub; 580 581 ksnprintf(cx->name, sizeof(cx->name), "C%d", i); 582 583 sysctl_ctx_init(&cx->sysctl_ctx); 584 cx->sysctl_tree = SYSCTL_ADD_NODE(&cx->sysctl_ctx, 585 SYSCTL_STATIC_CHILDREN(_machdep_mwait), OID_AUTO, 586 cx->name, CTLFLAG_RW, NULL, "Cx control/info"); 587 if (cx->sysctl_tree == NULL) 588 continue; 589 590 cx->subcnt = CPUID_MWAIT_CX_SUBCNT(cpu_mwait_extemu, i); 591 SYSCTL_ADD_INT(&cx->sysctl_ctx, 592 SYSCTL_CHILDREN(cx->sysctl_tree), OID_AUTO, 593 "subcnt", CTLFLAG_RD, &cx->subcnt, 0, 594 "sub-state count"); 595 SYSCTL_ADD_PROC(&cx->sysctl_ctx, 596 SYSCTL_CHILDREN(cx->sysctl_tree), OID_AUTO, 597 "entered", (CTLTYPE_QUAD | CTLFLAG_RW), 0, 598 i, sysctl_cpu_idle_cnt, "Q", "# of times entered"); 599 600 for (sub = 0; sub < cx->subcnt; ++sub) 601 sbuf_printf(&sb, "C%d/%d ", i, sub); 602 } 603 sbuf_trim(&sb); 604 sbuf_finish(&sb); 605 606 /* 607 * Non-deep C-states 608 */ 609 cpu_mwait_c1_hints_cnt = cpu_mwait_cx_info[CPU_MWAIT_C1].subcnt; 610 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_C3; ++i) 611 cpu_mwait_hints_cnt += cpu_mwait_cx_info[i].subcnt; 612 cpu_mwait_hints = kmalloc(sizeof(int) * cpu_mwait_hints_cnt, 613 M_DEVBUF, M_WAITOK); 614 615 hint_idx = 0; 616 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_C3; ++i) { 617 int j, subcnt; 618 619 subcnt = cpu_mwait_cx_info[i].subcnt; 620 for (j = 0; j < subcnt; ++j) { 621 KASSERT(hint_idx < cpu_mwait_hints_cnt, 622 ("invalid mwait hint index %d", hint_idx)); 623 cpu_mwait_hints[hint_idx] = MWAIT_EAX_HINT(i, j); 624 ++hint_idx; 625 } 626 } 627 KASSERT(hint_idx == cpu_mwait_hints_cnt, 628 ("mwait hint count %d != index %d", 629 cpu_mwait_hints_cnt, hint_idx)); 630 631 if (bootverbose) { 632 kprintf("MWAIT hints (%d C1 hints):\n", cpu_mwait_c1_hints_cnt); 633 for (i = 0; i < cpu_mwait_hints_cnt; ++i) { 634 int hint = cpu_mwait_hints[i]; 635 636 kprintf(" C%d/%d hint 0x%04x\n", 637 MWAIT_EAX_TO_CX(hint), MWAIT_EAX_TO_CX_SUB(hint), 638 hint); 639 } 640 } 641 642 /* 643 * Deep C-states 644 */ 645 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_CX_MAX; ++i) 646 cpu_mwait_deep_hints_cnt += cpu_mwait_cx_info[i].subcnt; 647 cpu_mwait_deep_hints = kmalloc(sizeof(int) * cpu_mwait_deep_hints_cnt, 648 M_DEVBUF, M_WAITOK); 649 650 hint_idx = 0; 651 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_CX_MAX; ++i) { 652 int j, subcnt; 653 654 subcnt = cpu_mwait_cx_info[i].subcnt; 655 for (j = 0; j < subcnt; ++j) { 656 KASSERT(hint_idx < cpu_mwait_deep_hints_cnt, 657 ("invalid mwait deep hint index %d", hint_idx)); 658 cpu_mwait_deep_hints[hint_idx] = MWAIT_EAX_HINT(i, j); 659 ++hint_idx; 660 } 661 } 662 KASSERT(hint_idx == cpu_mwait_deep_hints_cnt, 663 ("mwait deep hint count %d != index %d", 664 cpu_mwait_deep_hints_cnt, hint_idx)); 665 666 if (bootverbose) { 667 kprintf("MWAIT deep hints:\n"); 668 for (i = 0; i < cpu_mwait_deep_hints_cnt; ++i) { 669 int hint = cpu_mwait_deep_hints[i]; 670 671 kprintf(" C%d/%d hint 0x%04x\n", 672 MWAIT_EAX_TO_CX(hint), MWAIT_EAX_TO_CX_SUB(hint), 673 hint); 674 } 675 } 676 cpu_idle_repeat_max = 256 * cpu_mwait_deep_hints_cnt; 677 678 for (i = 0; i < ncpus; ++i) { 679 char name[16]; 680 681 ksnprintf(name, sizeof(name), "idle%d", i); 682 SYSCTL_ADD_PROC(NULL, 683 SYSCTL_STATIC_CHILDREN(_machdep_mwait_CX), OID_AUTO, 684 name, (CTLTYPE_STRING | CTLFLAG_RW), &cpu_idle_stats[i], 685 0, cpu_mwait_cx_pcpu_idle_sysctl, "A", ""); 686 } 687 } 688 689 static void 690 cpu_finish(void *dummy __unused) 691 { 692 cpu_setregs(); 693 cpu_mwait_attach(); 694 } 695 696 static void 697 pic_finish(void *dummy __unused) 698 { 699 /* Log ELCR information */ 700 elcr_dump(); 701 702 /* Log MPTABLE information */ 703 mptable_pci_int_dump(); 704 705 /* Finalize PCI */ 706 MachIntrABI.finalize(); 707 } 708 709 /* 710 * Send an interrupt to process. 711 * 712 * Stack is set up to allow sigcode stored 713 * at top to call routine, followed by kcall 714 * to sigreturn routine below. After sigreturn 715 * resets the signal mask, the stack, and the 716 * frame pointer, it returns to the user 717 * specified pc, psl. 718 */ 719 void 720 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code) 721 { 722 struct lwp *lp = curthread->td_lwp; 723 struct proc *p = lp->lwp_proc; 724 struct trapframe *regs; 725 struct sigacts *psp = p->p_sigacts; 726 struct sigframe sf, *sfp; 727 int oonstack; 728 char *sp; 729 730 regs = lp->lwp_md.md_regs; 731 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 732 733 /* Save user context */ 734 bzero(&sf, sizeof(struct sigframe)); 735 sf.sf_uc.uc_sigmask = *mask; 736 sf.sf_uc.uc_stack = lp->lwp_sigstk; 737 sf.sf_uc.uc_mcontext.mc_onstack = oonstack; 738 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0); 739 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe)); 740 741 /* Make the size of the saved context visible to userland */ 742 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); 743 744 /* Allocate and validate space for the signal handler context. */ 745 if ((lp->lwp_flags & LWP_ALTSTACK) != 0 && !oonstack && 746 SIGISMEMBER(psp->ps_sigonstack, sig)) { 747 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size - 748 sizeof(struct sigframe)); 749 lp->lwp_sigstk.ss_flags |= SS_ONSTACK; 750 } else { 751 /* We take red zone into account */ 752 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128; 753 } 754 755 /* 756 * XXX AVX needs 64-byte alignment but sigframe has other fields and 757 * the embedded ucontext is not at the front, so aligning this won't 758 * help us. Fortunately we bcopy in/out of the sigframe, so the 759 * kernel is ok. 760 * 761 * The problem though is if userland winds up trying to use the 762 * context directly. 763 */ 764 sfp = (struct sigframe *)((intptr_t)sp & ~(intptr_t)0xF); 765 766 /* Translate the signal is appropriate */ 767 if (p->p_sysent->sv_sigtbl) { 768 if (sig <= p->p_sysent->sv_sigsize) 769 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 770 } 771 772 /* 773 * Build the argument list for the signal handler. 774 * 775 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx) 776 */ 777 regs->tf_rdi = sig; /* argument 1 */ 778 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */ 779 780 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 781 /* 782 * Signal handler installed with SA_SIGINFO. 783 * 784 * action(signo, siginfo, ucontext) 785 */ 786 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */ 787 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */ 788 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 789 790 /* fill siginfo structure */ 791 sf.sf_si.si_signo = sig; 792 sf.sf_si.si_code = code; 793 sf.sf_si.si_addr = (void *)regs->tf_addr; 794 } else { 795 /* 796 * Old FreeBSD-style arguments. 797 * 798 * handler (signo, code, [uc], addr) 799 */ 800 regs->tf_rsi = (register_t)code; /* argument 2 */ 801 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */ 802 sf.sf_ahu.sf_handler = catcher; 803 } 804 805 /* 806 * If we're a vm86 process, we want to save the segment registers. 807 * We also change eflags to be our emulated eflags, not the actual 808 * eflags. 809 */ 810 #if 0 /* JG */ 811 if (regs->tf_eflags & PSL_VM) { 812 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 813 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86; 814 815 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 816 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 817 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 818 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 819 820 if (vm86->vm86_has_vme == 0) 821 sf.sf_uc.uc_mcontext.mc_eflags = 822 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 823 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 824 825 /* 826 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 827 * syscalls made by the signal handler. This just avoids 828 * wasting time for our lazy fixup of such faults. PSL_NT 829 * does nothing in vm86 mode, but vm86 programs can set it 830 * almost legitimately in probes for old cpu types. 831 */ 832 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 833 } 834 #endif 835 836 /* 837 * Save the FPU state and reinit the FP unit 838 */ 839 npxpush(&sf.sf_uc.uc_mcontext); 840 841 /* 842 * Copy the sigframe out to the user's stack. 843 */ 844 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) { 845 /* 846 * Something is wrong with the stack pointer. 847 * ...Kill the process. 848 */ 849 sigexit(lp, SIGILL); 850 } 851 852 regs->tf_rsp = (register_t)sfp; 853 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 854 855 /* 856 * i386 abi specifies that the direction flag must be cleared 857 * on function entry 858 */ 859 regs->tf_rflags &= ~(PSL_T|PSL_D); 860 861 /* 862 * 64 bit mode has a code and stack selector but 863 * no data or extra selector. %fs and %gs are not 864 * stored in-context. 865 */ 866 regs->tf_cs = _ucodesel; 867 regs->tf_ss = _udatasel; 868 clear_quickret(); 869 } 870 871 /* 872 * Sanitize the trapframe for a virtual kernel passing control to a custom 873 * VM context. Remove any items that would otherwise create a privilage 874 * issue. 875 * 876 * XXX at the moment we allow userland to set the resume flag. Is this a 877 * bad idea? 878 */ 879 int 880 cpu_sanitize_frame(struct trapframe *frame) 881 { 882 frame->tf_cs = _ucodesel; 883 frame->tf_ss = _udatasel; 884 /* XXX VM (8086) mode not supported? */ 885 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP); 886 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I; 887 888 return(0); 889 } 890 891 /* 892 * Sanitize the tls so loading the descriptor does not blow up 893 * on us. For x86_64 we don't have to do anything. 894 */ 895 int 896 cpu_sanitize_tls(struct savetls *tls) 897 { 898 return(0); 899 } 900 901 /* 902 * sigreturn(ucontext_t *sigcntxp) 903 * 904 * System call to cleanup state after a signal 905 * has been taken. Reset signal mask and 906 * stack state from context left by sendsig (above). 907 * Return to previous pc and psl as specified by 908 * context left by sendsig. Check carefully to 909 * make sure that the user has not modified the 910 * state to gain improper privileges. 911 * 912 * MPSAFE 913 */ 914 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 915 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 916 917 int 918 sys_sigreturn(struct sigreturn_args *uap) 919 { 920 struct lwp *lp = curthread->td_lwp; 921 struct trapframe *regs; 922 ucontext_t uc; 923 ucontext_t *ucp; 924 register_t rflags; 925 int cs; 926 int error; 927 928 /* 929 * We have to copy the information into kernel space so userland 930 * can't modify it while we are sniffing it. 931 */ 932 regs = lp->lwp_md.md_regs; 933 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 934 if (error) 935 return (error); 936 ucp = &uc; 937 rflags = ucp->uc_mcontext.mc_rflags; 938 939 /* VM (8086) mode not supported */ 940 rflags &= ~PSL_VM_UNSUPP; 941 942 #if 0 /* JG */ 943 if (eflags & PSL_VM) { 944 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 945 struct vm86_kernel *vm86; 946 947 /* 948 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 949 * set up the vm86 area, and we can't enter vm86 mode. 950 */ 951 if (lp->lwp_thread->td_pcb->pcb_ext == 0) 952 return (EINVAL); 953 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86; 954 if (vm86->vm86_inited == 0) 955 return (EINVAL); 956 957 /* go back to user mode if both flags are set */ 958 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 959 trapsignal(lp, SIGBUS, 0); 960 961 if (vm86->vm86_has_vme) { 962 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 963 (eflags & VME_USERCHANGE) | PSL_VM; 964 } else { 965 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 966 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 967 (eflags & VM_USERCHANGE) | PSL_VM; 968 } 969 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe)); 970 tf->tf_eflags = eflags; 971 tf->tf_vm86_ds = tf->tf_ds; 972 tf->tf_vm86_es = tf->tf_es; 973 tf->tf_vm86_fs = tf->tf_fs; 974 tf->tf_vm86_gs = tf->tf_gs; 975 tf->tf_ds = _udatasel; 976 tf->tf_es = _udatasel; 977 tf->tf_fs = _udatasel; 978 tf->tf_gs = _udatasel; 979 } else 980 #endif 981 { 982 /* 983 * Don't allow users to change privileged or reserved flags. 984 */ 985 /* 986 * XXX do allow users to change the privileged flag PSL_RF. 987 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 988 * should sometimes set it there too. tf_eflags is kept in 989 * the signal context during signal handling and there is no 990 * other place to remember it, so the PSL_RF bit may be 991 * corrupted by the signal handler without us knowing. 992 * Corruption of the PSL_RF bit at worst causes one more or 993 * one less debugger trap, so allowing it is fairly harmless. 994 */ 995 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 996 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags); 997 return(EINVAL); 998 } 999 1000 /* 1001 * Don't allow users to load a valid privileged %cs. Let the 1002 * hardware check for invalid selectors, excess privilege in 1003 * other selectors, invalid %eip's and invalid %esp's. 1004 */ 1005 cs = ucp->uc_mcontext.mc_cs; 1006 if (!CS_SECURE(cs)) { 1007 kprintf("sigreturn: cs = 0x%x\n", cs); 1008 trapsignal(lp, SIGBUS, T_PROTFLT); 1009 return(EINVAL); 1010 } 1011 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe)); 1012 } 1013 1014 /* 1015 * Restore the FPU state from the frame 1016 */ 1017 crit_enter(); 1018 npxpop(&ucp->uc_mcontext); 1019 1020 if (ucp->uc_mcontext.mc_onstack & 1) 1021 lp->lwp_sigstk.ss_flags |= SS_ONSTACK; 1022 else 1023 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK; 1024 1025 lp->lwp_sigmask = ucp->uc_sigmask; 1026 SIG_CANTMASK(lp->lwp_sigmask); 1027 clear_quickret(); 1028 crit_exit(); 1029 return(EJUSTRETURN); 1030 } 1031 1032 /* 1033 * Machine dependent boot() routine 1034 * 1035 * I haven't seen anything to put here yet 1036 * Possibly some stuff might be grafted back here from boot() 1037 */ 1038 void 1039 cpu_boot(int howto) 1040 { 1041 } 1042 1043 /* 1044 * Shutdown the CPU as much as possible 1045 */ 1046 void 1047 cpu_halt(void) 1048 { 1049 for (;;) 1050 __asm__ __volatile("hlt"); 1051 } 1052 1053 /* 1054 * cpu_idle() represents the idle LWKT. You cannot return from this function 1055 * (unless you want to blow things up!). Instead we look for runnable threads 1056 * and loop or halt as appropriate. Giant is not held on entry to the thread. 1057 * 1058 * The main loop is entered with a critical section held, we must release 1059 * the critical section before doing anything else. lwkt_switch() will 1060 * check for pending interrupts due to entering and exiting its own 1061 * critical section. 1062 * 1063 * NOTE: On an SMP system we rely on a scheduler IPI to wake a HLTed cpu up. 1064 * However, there are cases where the idlethread will be entered with 1065 * the possibility that no IPI will occur and in such cases 1066 * lwkt_switch() sets TDF_IDLE_NOHLT. 1067 * 1068 * NOTE: cpu_idle_repeat determines how many entries into the idle thread 1069 * must occur before it starts using ACPI halt. 1070 * 1071 * NOTE: Value overridden in hammer_time(). 1072 */ 1073 static int cpu_idle_hlt = 2; 1074 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 1075 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 1076 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_repeat, CTLFLAG_RW, 1077 &cpu_idle_repeat, 0, "Idle entries before acpi hlt"); 1078 1079 SYSCTL_PROC(_machdep, OID_AUTO, cpu_idle_hltcnt, (CTLTYPE_QUAD | CTLFLAG_RW), 1080 0, CPU_IDLE_STAT_HALT, sysctl_cpu_idle_cnt, "Q", "Idle loop entry halts"); 1081 SYSCTL_PROC(_machdep, OID_AUTO, cpu_idle_spincnt, (CTLTYPE_QUAD | CTLFLAG_RW), 1082 0, CPU_IDLE_STAT_SPIN, sysctl_cpu_idle_cnt, "Q", "Idle loop entry spins"); 1083 1084 static void 1085 cpu_idle_default_hook(void) 1086 { 1087 /* 1088 * We must guarentee that hlt is exactly the instruction 1089 * following the sti. 1090 */ 1091 __asm __volatile("sti; hlt"); 1092 } 1093 1094 /* Other subsystems (e.g., ACPI) can hook this later. */ 1095 void (*cpu_idle_hook)(void) = cpu_idle_default_hook; 1096 1097 static __inline int 1098 cpu_mwait_cx_hint(struct cpu_idle_stat *stat) 1099 { 1100 int hint, cx_idx; 1101 u_int idx; 1102 1103 hint = stat->hint; 1104 if (hint >= 0) 1105 goto done; 1106 1107 idx = (stat->repeat + stat->repeat_last + stat->repeat_delta) >> 1108 cpu_mwait_repeat_shift; 1109 if (idx >= cpu_mwait_c1_hints_cnt) { 1110 /* Step up faster, once we walked through all C1 states */ 1111 stat->repeat_delta += 1 << (cpu_mwait_repeat_shift + 1); 1112 } 1113 if (hint == CPU_MWAIT_HINT_AUTODEEP) { 1114 if (idx >= cpu_mwait_deep_hints_cnt) 1115 idx = cpu_mwait_deep_hints_cnt - 1; 1116 hint = cpu_mwait_deep_hints[idx]; 1117 } else { 1118 if (idx >= cpu_mwait_hints_cnt) 1119 idx = cpu_mwait_hints_cnt - 1; 1120 hint = cpu_mwait_hints[idx]; 1121 } 1122 done: 1123 cx_idx = MWAIT_EAX_TO_CX(hint); 1124 if (cx_idx >= 0 && cx_idx < CPU_MWAIT_CX_MAX) 1125 stat->mwait_cx[cx_idx]++; 1126 return hint; 1127 } 1128 1129 void 1130 cpu_idle(void) 1131 { 1132 globaldata_t gd = mycpu; 1133 struct cpu_idle_stat *stat = &cpu_idle_stats[gd->gd_cpuid]; 1134 struct thread *td __debugvar = gd->gd_curthread; 1135 int reqflags; 1136 int quick; 1137 1138 stat->repeat = stat->repeat_last = cpu_idle_repeat_max; 1139 1140 crit_exit(); 1141 KKASSERT(td->td_critcount == 0); 1142 1143 for (;;) { 1144 /* 1145 * See if there are any LWKTs ready to go. 1146 */ 1147 lwkt_switch(); 1148 1149 /* 1150 * When halting inside a cli we must check for reqflags 1151 * races, particularly [re]schedule requests. Running 1152 * splz() does the job. 1153 * 1154 * cpu_idle_hlt: 1155 * 0 Never halt, just spin 1156 * 1157 * 1 Always use HLT (or MONITOR/MWAIT if avail). 1158 * 1159 * Better default for modern (Haswell+) Intel 1160 * cpus. 1161 * 1162 * 2 Use HLT/MONITOR/MWAIT up to a point and then 1163 * use the ACPI halt (default). This is a hybrid 1164 * approach. See machdep.cpu_idle_repeat. 1165 * 1166 * Better default for modern AMD cpus and older 1167 * Intel cpus. 1168 * 1169 * 3 Always use the ACPI halt. This typically 1170 * eats the least amount of power but the cpu 1171 * will be slow waking up. Slows down e.g. 1172 * compiles and other pipe/event oriented stuff. 1173 * 1174 * 4 Always use HLT. 1175 * 1176 * NOTE: Interrupts are enabled and we are not in a critical 1177 * section. 1178 * 1179 * NOTE: Preemptions do not reset gd_idle_repeat. Also we 1180 * don't bother capping gd_idle_repeat, it is ok if 1181 * it overflows. 1182 * 1183 * Implement optimized invltlb operations when halted 1184 * in idle. By setting the bit in smp_idleinvl_mask 1185 * we inform other cpus that they can set _reqs to 1186 * request an invltlb. Current the code to do that 1187 * sets the bits in _reqs anyway, but then check _mask 1188 * to determine if they can assume the invltlb will execute. 1189 * 1190 * A critical section is required to ensure that interrupts 1191 * do not fully run until after we've had a chance to execute 1192 * the request. 1193 */ 1194 if (gd->gd_idle_repeat == 0) { 1195 stat->repeat = (stat->repeat + stat->repeat_last) >> 1; 1196 if (stat->repeat > cpu_idle_repeat_max) 1197 stat->repeat = cpu_idle_repeat_max; 1198 stat->repeat_last = 0; 1199 stat->repeat_delta = 0; 1200 } 1201 ++stat->repeat_last; 1202 1203 ++gd->gd_idle_repeat; 1204 reqflags = gd->gd_reqflags; 1205 quick = (cpu_idle_hlt == 1) || 1206 (cpu_idle_hlt < 3 && 1207 gd->gd_idle_repeat < cpu_idle_repeat); 1208 1209 if (quick && (cpu_mi_feature & CPU_MI_MONITOR) && 1210 (reqflags & RQF_IDLECHECK_WK_MASK) == 0) { 1211 splz(); /* XXX */ 1212 crit_enter_gd(gd); 1213 ATOMIC_CPUMASK_ORBIT(smp_idleinvl_mask, gd->gd_cpuid); 1214 cpu_mmw_pause_int(&gd->gd_reqflags, reqflags, 1215 cpu_mwait_cx_hint(stat), 0); 1216 stat->halt++; 1217 ATOMIC_CPUMASK_NANDBIT(smp_idleinvl_mask, gd->gd_cpuid); 1218 if (ATOMIC_CPUMASK_TESTANDCLR(smp_idleinvl_reqs, 1219 gd->gd_cpuid)) { 1220 cpu_invltlb(); 1221 cpu_mfence(); 1222 } 1223 crit_exit_gd(gd); 1224 } else if (cpu_idle_hlt) { 1225 __asm __volatile("cli"); 1226 splz(); 1227 crit_enter_gd(gd); 1228 ATOMIC_CPUMASK_ORBIT(smp_idleinvl_mask, gd->gd_cpuid); 1229 if ((gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) { 1230 if (quick) 1231 cpu_idle_default_hook(); 1232 else 1233 cpu_idle_hook(); 1234 } 1235 __asm __volatile("sti"); 1236 stat->halt++; 1237 ATOMIC_CPUMASK_NANDBIT(smp_idleinvl_mask, gd->gd_cpuid); 1238 if (ATOMIC_CPUMASK_TESTANDCLR(smp_idleinvl_reqs, 1239 gd->gd_cpuid)) { 1240 cpu_invltlb(); 1241 cpu_mfence(); 1242 } 1243 crit_exit_gd(gd); 1244 } else { 1245 splz(); 1246 __asm __volatile("sti"); 1247 stat->spin++; 1248 } 1249 } 1250 } 1251 1252 /* 1253 * This routine is called if a spinlock has been held through the 1254 * exponential backoff period and is seriously contested. On a real cpu 1255 * we let it spin. 1256 */ 1257 void 1258 cpu_spinlock_contested(void) 1259 { 1260 cpu_pause(); 1261 } 1262 1263 /* 1264 * Clear registers on exec 1265 */ 1266 void 1267 exec_setregs(u_long entry, u_long stack, u_long ps_strings) 1268 { 1269 struct thread *td = curthread; 1270 struct lwp *lp = td->td_lwp; 1271 struct pcb *pcb = td->td_pcb; 1272 struct trapframe *regs = lp->lwp_md.md_regs; 1273 1274 /* was i386_user_cleanup() in NetBSD */ 1275 user_ldt_free(pcb); 1276 1277 clear_quickret(); 1278 bzero((char *)regs, sizeof(struct trapframe)); 1279 regs->tf_rip = entry; 1280 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */ 1281 regs->tf_rdi = stack; /* argv */ 1282 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 1283 regs->tf_ss = _udatasel; 1284 regs->tf_cs = _ucodesel; 1285 regs->tf_rbx = ps_strings; 1286 1287 /* 1288 * Reset the hardware debug registers if they were in use. 1289 * They won't have any meaning for the newly exec'd process. 1290 */ 1291 if (pcb->pcb_flags & PCB_DBREGS) { 1292 pcb->pcb_dr0 = 0; 1293 pcb->pcb_dr1 = 0; 1294 pcb->pcb_dr2 = 0; 1295 pcb->pcb_dr3 = 0; 1296 pcb->pcb_dr6 = 0; 1297 pcb->pcb_dr7 = 0; /* JG set bit 10? */ 1298 if (pcb == td->td_pcb) { 1299 /* 1300 * Clear the debug registers on the running 1301 * CPU, otherwise they will end up affecting 1302 * the next process we switch to. 1303 */ 1304 reset_dbregs(); 1305 } 1306 pcb->pcb_flags &= ~PCB_DBREGS; 1307 } 1308 1309 /* 1310 * Initialize the math emulator (if any) for the current process. 1311 * Actually, just clear the bit that says that the emulator has 1312 * been initialized. Initialization is delayed until the process 1313 * traps to the emulator (if it is done at all) mainly because 1314 * emulators don't provide an entry point for initialization. 1315 */ 1316 pcb->pcb_flags &= ~FP_SOFTFP; 1317 1318 /* 1319 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing 1320 * gd_npxthread. Otherwise a preemptive interrupt thread 1321 * may panic in npxdna(). 1322 */ 1323 crit_enter(); 1324 load_cr0(rcr0() | CR0_MP); 1325 1326 /* 1327 * NOTE: The MSR values must be correct so we can return to 1328 * userland. gd_user_fs/gs must be correct so the switch 1329 * code knows what the current MSR values are. 1330 */ 1331 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */ 1332 pcb->pcb_gsbase = 0; 1333 mdcpu->gd_user_fs = 0; /* Cache of current MSR values */ 1334 mdcpu->gd_user_gs = 0; 1335 wrmsr(MSR_FSBASE, 0); /* Set MSR values for return to userland */ 1336 wrmsr(MSR_KGSBASE, 0); 1337 1338 /* Initialize the npx (if any) for the current process. */ 1339 npxinit(); 1340 crit_exit(); 1341 1342 pcb->pcb_ds = _udatasel; 1343 pcb->pcb_es = _udatasel; 1344 pcb->pcb_fs = _udatasel; 1345 pcb->pcb_gs = _udatasel; 1346 } 1347 1348 void 1349 cpu_setregs(void) 1350 { 1351 register_t cr0; 1352 1353 cr0 = rcr0(); 1354 cr0 |= CR0_NE; /* Done by npxinit() */ 1355 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 1356 cr0 |= CR0_WP | CR0_AM; 1357 load_cr0(cr0); 1358 load_gs(_udatasel); 1359 } 1360 1361 static int 1362 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 1363 { 1364 int error; 1365 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1366 req); 1367 if (!error && req->newptr) 1368 resettodr(); 1369 return (error); 1370 } 1371 1372 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1373 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1374 1375 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1376 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1377 1378 #if 0 /* JG */ 1379 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1380 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1381 #endif 1382 1383 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1384 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1385 1386 extern u_long bootdev; /* not a cdev_t - encoding is different */ 1387 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev, 1388 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)"); 1389 1390 static int 1391 efi_map_sysctl_handler(SYSCTL_HANDLER_ARGS) 1392 { 1393 struct efi_map_header *efihdr; 1394 caddr_t kmdp; 1395 uint32_t efisize; 1396 1397 kmdp = preload_search_by_type("elf kernel"); 1398 if (kmdp == NULL) 1399 kmdp = preload_search_by_type("elf64 kernel"); 1400 efihdr = (struct efi_map_header *)preload_search_info(kmdp, 1401 MODINFO_METADATA | MODINFOMD_EFI_MAP); 1402 if (efihdr == NULL) 1403 return (0); 1404 efisize = *((uint32_t *)efihdr - 1); 1405 return (SYSCTL_OUT(req, efihdr, efisize)); 1406 } 1407 SYSCTL_PROC(_machdep, OID_AUTO, efi_map, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0, 1408 efi_map_sysctl_handler, "S,efi_map_header", "Raw EFI Memory Map"); 1409 1410 /* 1411 * Initialize 386 and configure to run kernel 1412 */ 1413 1414 /* 1415 * Initialize segments & interrupt table 1416 */ 1417 1418 int _default_ldt; 1419 struct user_segment_descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1420 struct gate_descriptor idt_arr[MAXCPU][NIDT]; 1421 #if 0 /* JG */ 1422 union descriptor ldt[NLDT]; /* local descriptor table */ 1423 #endif 1424 1425 /* table descriptors - used to load tables by cpu */ 1426 struct region_descriptor r_gdt; 1427 struct region_descriptor r_idt_arr[MAXCPU]; 1428 1429 /* JG proc0paddr is a virtual address */ 1430 void *proc0paddr; 1431 /* JG alignment? */ 1432 char proc0paddr_buff[LWKT_THREAD_STACK]; 1433 1434 1435 /* software prototypes -- in more palatable form */ 1436 struct soft_segment_descriptor gdt_segs[] = { 1437 /* GNULL_SEL 0 Null Descriptor */ 1438 { 0x0, /* segment base address */ 1439 0x0, /* length */ 1440 0, /* segment type */ 1441 0, /* segment descriptor priority level */ 1442 0, /* segment descriptor present */ 1443 0, /* long */ 1444 0, /* default 32 vs 16 bit size */ 1445 0 /* limit granularity (byte/page units)*/ }, 1446 /* GCODE_SEL 1 Code Descriptor for kernel */ 1447 { 0x0, /* segment base address */ 1448 0xfffff, /* length - all address space */ 1449 SDT_MEMERA, /* segment type */ 1450 SEL_KPL, /* segment descriptor priority level */ 1451 1, /* segment descriptor present */ 1452 1, /* long */ 1453 0, /* default 32 vs 16 bit size */ 1454 1 /* limit granularity (byte/page units)*/ }, 1455 /* GDATA_SEL 2 Data Descriptor for kernel */ 1456 { 0x0, /* segment base address */ 1457 0xfffff, /* length - all address space */ 1458 SDT_MEMRWA, /* segment type */ 1459 SEL_KPL, /* segment descriptor priority level */ 1460 1, /* segment descriptor present */ 1461 1, /* long */ 1462 0, /* default 32 vs 16 bit size */ 1463 1 /* limit granularity (byte/page units)*/ }, 1464 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */ 1465 { 0x0, /* segment base address */ 1466 0xfffff, /* length - all address space */ 1467 SDT_MEMERA, /* segment type */ 1468 SEL_UPL, /* segment descriptor priority level */ 1469 1, /* segment descriptor present */ 1470 0, /* long */ 1471 1, /* default 32 vs 16 bit size */ 1472 1 /* limit granularity (byte/page units)*/ }, 1473 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */ 1474 { 0x0, /* segment base address */ 1475 0xfffff, /* length - all address space */ 1476 SDT_MEMRWA, /* segment type */ 1477 SEL_UPL, /* segment descriptor priority level */ 1478 1, /* segment descriptor present */ 1479 0, /* long */ 1480 1, /* default 32 vs 16 bit size */ 1481 1 /* limit granularity (byte/page units)*/ }, 1482 /* GUCODE_SEL 5 64 bit Code Descriptor for user */ 1483 { 0x0, /* segment base address */ 1484 0xfffff, /* length - all address space */ 1485 SDT_MEMERA, /* segment type */ 1486 SEL_UPL, /* segment descriptor priority level */ 1487 1, /* segment descriptor present */ 1488 1, /* long */ 1489 0, /* default 32 vs 16 bit size */ 1490 1 /* limit granularity (byte/page units)*/ }, 1491 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1492 { 1493 0x0, /* segment base address */ 1494 sizeof(struct x86_64tss)-1,/* length - all address space */ 1495 SDT_SYSTSS, /* segment type */ 1496 SEL_KPL, /* segment descriptor priority level */ 1497 1, /* segment descriptor present */ 1498 0, /* long */ 1499 0, /* unused - default 32 vs 16 bit size */ 1500 0 /* limit granularity (byte/page units)*/ }, 1501 /* Actually, the TSS is a system descriptor which is double size */ 1502 { 0x0, /* segment base address */ 1503 0x0, /* length */ 1504 0, /* segment type */ 1505 0, /* segment descriptor priority level */ 1506 0, /* segment descriptor present */ 1507 0, /* long */ 1508 0, /* default 32 vs 16 bit size */ 1509 0 /* limit granularity (byte/page units)*/ }, 1510 /* GUGS32_SEL 8 32 bit GS Descriptor for user */ 1511 { 0x0, /* segment base address */ 1512 0xfffff, /* length - all address space */ 1513 SDT_MEMRWA, /* segment type */ 1514 SEL_UPL, /* segment descriptor priority level */ 1515 1, /* segment descriptor present */ 1516 0, /* long */ 1517 1, /* default 32 vs 16 bit size */ 1518 1 /* limit granularity (byte/page units)*/ }, 1519 }; 1520 1521 void 1522 setidt_global(int idx, inthand_t *func, int typ, int dpl, int ist) 1523 { 1524 int cpu; 1525 1526 for (cpu = 0; cpu < MAXCPU; ++cpu) { 1527 struct gate_descriptor *ip = &idt_arr[cpu][idx]; 1528 1529 ip->gd_looffset = (uintptr_t)func; 1530 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL); 1531 ip->gd_ist = ist; 1532 ip->gd_xx = 0; 1533 ip->gd_type = typ; 1534 ip->gd_dpl = dpl; 1535 ip->gd_p = 1; 1536 ip->gd_hioffset = ((uintptr_t)func)>>16 ; 1537 } 1538 } 1539 1540 void 1541 setidt(int idx, inthand_t *func, int typ, int dpl, int ist, int cpu) 1542 { 1543 struct gate_descriptor *ip; 1544 1545 KASSERT(cpu >= 0 && cpu < ncpus, ("invalid cpu %d", cpu)); 1546 1547 ip = &idt_arr[cpu][idx]; 1548 ip->gd_looffset = (uintptr_t)func; 1549 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL); 1550 ip->gd_ist = ist; 1551 ip->gd_xx = 0; 1552 ip->gd_type = typ; 1553 ip->gd_dpl = dpl; 1554 ip->gd_p = 1; 1555 ip->gd_hioffset = ((uintptr_t)func)>>16 ; 1556 } 1557 1558 #define IDTVEC(name) __CONCAT(X,name) 1559 1560 extern inthand_t 1561 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1562 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1563 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1564 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1565 IDTVEC(xmm), IDTVEC(dblfault), 1566 IDTVEC(fast_syscall), IDTVEC(fast_syscall32); 1567 1568 void 1569 sdtossd(struct user_segment_descriptor *sd, struct soft_segment_descriptor *ssd) 1570 { 1571 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1572 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1573 ssd->ssd_type = sd->sd_type; 1574 ssd->ssd_dpl = sd->sd_dpl; 1575 ssd->ssd_p = sd->sd_p; 1576 ssd->ssd_def32 = sd->sd_def32; 1577 ssd->ssd_gran = sd->sd_gran; 1578 } 1579 1580 void 1581 ssdtosd(struct soft_segment_descriptor *ssd, struct user_segment_descriptor *sd) 1582 { 1583 1584 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 1585 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff; 1586 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 1587 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 1588 sd->sd_type = ssd->ssd_type; 1589 sd->sd_dpl = ssd->ssd_dpl; 1590 sd->sd_p = ssd->ssd_p; 1591 sd->sd_long = ssd->ssd_long; 1592 sd->sd_def32 = ssd->ssd_def32; 1593 sd->sd_gran = ssd->ssd_gran; 1594 } 1595 1596 void 1597 ssdtosyssd(struct soft_segment_descriptor *ssd, 1598 struct system_segment_descriptor *sd) 1599 { 1600 1601 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 1602 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful; 1603 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 1604 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 1605 sd->sd_type = ssd->ssd_type; 1606 sd->sd_dpl = ssd->ssd_dpl; 1607 sd->sd_p = ssd->ssd_p; 1608 sd->sd_gran = ssd->ssd_gran; 1609 } 1610 1611 /* 1612 * Populate the (physmap) array with base/bound pairs describing the 1613 * available physical memory in the system, then test this memory and 1614 * build the phys_avail array describing the actually-available memory. 1615 * 1616 * If we cannot accurately determine the physical memory map, then use 1617 * value from the 0xE801 call, and failing that, the RTC. 1618 * 1619 * Total memory size may be set by the kernel environment variable 1620 * hw.physmem or the compile-time define MAXMEM. 1621 * 1622 * Memory is aligned to PHYSMAP_ALIGN which must be a multiple 1623 * of PAGE_SIZE. This also greatly reduces the memory test time 1624 * which would otherwise be excessive on machines with > 8G of ram. 1625 * 1626 * XXX first should be vm_paddr_t. 1627 */ 1628 1629 #define PHYSMAP_ALIGN (vm_paddr_t)(128 * 1024) 1630 #define PHYSMAP_ALIGN_MASK (vm_paddr_t)(PHYSMAP_ALIGN - 1) 1631 vm_paddr_t physmap[PHYSMAP_SIZE]; 1632 struct bios_smap *smapbase, *smap, *smapend; 1633 struct efi_map_header *efihdrbase; 1634 u_int32_t smapsize; 1635 #define PHYSMAP_HANDWAVE (vm_paddr_t)(2 * 1024 * 1024) 1636 #define PHYSMAP_HANDWAVE_MASK (PHYSMAP_HANDWAVE - 1) 1637 1638 static void 1639 add_smap_entries(int *physmap_idx) 1640 { 1641 int i; 1642 1643 smapsize = *((u_int32_t *)smapbase - 1); 1644 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize); 1645 1646 for (smap = smapbase; smap < smapend; smap++) { 1647 if (boothowto & RB_VERBOSE) 1648 kprintf("SMAP type=%02x base=%016lx len=%016lx\n", 1649 smap->type, smap->base, smap->length); 1650 1651 if (smap->type != SMAP_TYPE_MEMORY) 1652 continue; 1653 1654 if (smap->length == 0) 1655 continue; 1656 1657 for (i = 0; i <= *physmap_idx; i += 2) { 1658 if (smap->base < physmap[i + 1]) { 1659 if (boothowto & RB_VERBOSE) { 1660 kprintf("Overlapping or non-monotonic " 1661 "memory region, ignoring " 1662 "second region\n"); 1663 } 1664 break; 1665 } 1666 } 1667 if (i <= *physmap_idx) 1668 continue; 1669 1670 Realmem += smap->length; 1671 1672 if (smap->base == physmap[*physmap_idx + 1]) { 1673 physmap[*physmap_idx + 1] += smap->length; 1674 continue; 1675 } 1676 1677 *physmap_idx += 2; 1678 if (*physmap_idx == PHYSMAP_SIZE) { 1679 kprintf("Too many segments in the physical " 1680 "address map, giving up\n"); 1681 break; 1682 } 1683 physmap[*physmap_idx] = smap->base; 1684 physmap[*physmap_idx + 1] = smap->base + smap->length; 1685 } 1686 } 1687 1688 static void 1689 add_efi_map_entries(int *physmap_idx) 1690 { 1691 struct efi_md *map, *p; 1692 const char *type; 1693 size_t efisz; 1694 int i, ndesc; 1695 1696 static const char *types[] = { 1697 "Reserved", 1698 "LoaderCode", 1699 "LoaderData", 1700 "BootServicesCode", 1701 "BootServicesData", 1702 "RuntimeServicesCode", 1703 "RuntimeServicesData", 1704 "ConventionalMemory", 1705 "UnusableMemory", 1706 "ACPIReclaimMemory", 1707 "ACPIMemoryNVS", 1708 "MemoryMappedIO", 1709 "MemoryMappedIOPortSpace", 1710 "PalCode" 1711 }; 1712 1713 /* 1714 * Memory map data provided by UEFI via the GetMemoryMap 1715 * Boot Services API. 1716 */ 1717 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf; 1718 map = (struct efi_md *)((uint8_t *)efihdrbase + efisz); 1719 1720 if (efihdrbase->descriptor_size == 0) 1721 return; 1722 ndesc = efihdrbase->memory_size / efihdrbase->descriptor_size; 1723 1724 if (boothowto & RB_VERBOSE) 1725 kprintf("%23s %12s %12s %8s %4s\n", 1726 "Type", "Physical", "Virtual", "#Pages", "Attr"); 1727 1728 for (i = 0, p = map; i < ndesc; i++, 1729 p = efi_next_descriptor(p, efihdrbase->descriptor_size)) { 1730 if (boothowto & RB_VERBOSE) { 1731 if (p->md_type <= EFI_MD_TYPE_PALCODE) 1732 type = types[p->md_type]; 1733 else 1734 type = "<INVALID>"; 1735 kprintf("%23s %012lx %12p %08lx ", type, p->md_phys, 1736 p->md_virt, p->md_pages); 1737 if (p->md_attr & EFI_MD_ATTR_UC) 1738 kprintf("UC "); 1739 if (p->md_attr & EFI_MD_ATTR_WC) 1740 kprintf("WC "); 1741 if (p->md_attr & EFI_MD_ATTR_WT) 1742 kprintf("WT "); 1743 if (p->md_attr & EFI_MD_ATTR_WB) 1744 kprintf("WB "); 1745 if (p->md_attr & EFI_MD_ATTR_UCE) 1746 kprintf("UCE "); 1747 if (p->md_attr & EFI_MD_ATTR_WP) 1748 kprintf("WP "); 1749 if (p->md_attr & EFI_MD_ATTR_RP) 1750 kprintf("RP "); 1751 if (p->md_attr & EFI_MD_ATTR_XP) 1752 kprintf("XP "); 1753 if (p->md_attr & EFI_MD_ATTR_RT) 1754 kprintf("RUNTIME"); 1755 kprintf("\n"); 1756 } 1757 1758 switch (p->md_type) { 1759 case EFI_MD_TYPE_CODE: 1760 case EFI_MD_TYPE_DATA: 1761 case EFI_MD_TYPE_BS_CODE: 1762 case EFI_MD_TYPE_BS_DATA: 1763 case EFI_MD_TYPE_FREE: 1764 /* 1765 * We're allowed to use any entry with these types. 1766 */ 1767 break; 1768 default: 1769 continue; 1770 } 1771 1772 Realmem += p->md_pages * PAGE_SIZE; 1773 1774 if (p->md_phys == physmap[*physmap_idx + 1]) { 1775 physmap[*physmap_idx + 1] += p->md_pages * PAGE_SIZE; 1776 continue; 1777 } 1778 1779 *physmap_idx += 2; 1780 if (*physmap_idx == PHYSMAP_SIZE) { 1781 kprintf("Too many segments in the physical " 1782 "address map, giving up\n"); 1783 break; 1784 } 1785 physmap[*physmap_idx] = p->md_phys; 1786 physmap[*physmap_idx + 1] = p->md_phys + p->md_pages * PAGE_SIZE; 1787 } 1788 } 1789 1790 struct fb_info efi_fb_info; 1791 static int have_efi_framebuffer = 0; 1792 1793 static void 1794 efi_fb_init_vaddr(int direct_map) 1795 { 1796 uint64_t sz; 1797 vm_offset_t addr, v; 1798 1799 v = efi_fb_info.vaddr; 1800 sz = efi_fb_info.stride * efi_fb_info.height; 1801 1802 if (direct_map) { 1803 addr = PHYS_TO_DMAP(efi_fb_info.paddr); 1804 if (addr >= DMAP_MIN_ADDRESS && addr + sz < DMAP_MAX_ADDRESS) 1805 efi_fb_info.vaddr = addr; 1806 } else { 1807 efi_fb_info.vaddr = (vm_offset_t)pmap_mapdev_attr( 1808 efi_fb_info.paddr, sz, PAT_WRITE_COMBINING); 1809 } 1810 1811 if (v == 0 && efi_fb_info.vaddr != 0) 1812 memset((void *)efi_fb_info.vaddr, 0x77, sz); 1813 } 1814 1815 int 1816 probe_efi_fb(int early) 1817 { 1818 struct efi_fb *efifb; 1819 caddr_t kmdp; 1820 1821 if (have_efi_framebuffer) { 1822 if (!early && 1823 (efi_fb_info.vaddr == 0 || 1824 efi_fb_info.vaddr == PHYS_TO_DMAP(efi_fb_info.paddr))) 1825 efi_fb_init_vaddr(0); 1826 return 0; 1827 } 1828 1829 kmdp = preload_search_by_type("elf kernel"); 1830 if (kmdp == NULL) 1831 kmdp = preload_search_by_type("elf64 kernel"); 1832 efifb = (struct efi_fb *)preload_search_info(kmdp, 1833 MODINFO_METADATA | MODINFOMD_EFI_FB); 1834 if (efifb == NULL) 1835 return 1; 1836 1837 have_efi_framebuffer = 1; 1838 1839 efi_fb_info.is_vga_boot_display = 1; 1840 efi_fb_info.width = efifb->fb_width; 1841 efi_fb_info.height = efifb->fb_height; 1842 efi_fb_info.stride = efifb->fb_stride * 4; 1843 efi_fb_info.depth = 32; 1844 efi_fb_info.paddr = efifb->fb_addr; 1845 if (early) { 1846 efi_fb_info.vaddr = 0; 1847 } else { 1848 efi_fb_init_vaddr(0); 1849 } 1850 efi_fb_info.restore = NULL; 1851 efi_fb_info.device = NULL; 1852 1853 return 0; 1854 } 1855 1856 static void 1857 efifb_startup(void *arg) 1858 { 1859 probe_efi_fb(0); 1860 } 1861 1862 SYSINIT(efi_fb_info, SI_BOOT1_POST, SI_ORDER_FIRST, efifb_startup, NULL); 1863 1864 static void 1865 getmemsize(caddr_t kmdp, u_int64_t first) 1866 { 1867 int off, physmap_idx, pa_indx, da_indx; 1868 int i, j; 1869 vm_paddr_t pa; 1870 vm_paddr_t msgbuf_size; 1871 u_long physmem_tunable; 1872 pt_entry_t *pte; 1873 quad_t dcons_addr, dcons_size; 1874 1875 bzero(physmap, sizeof(physmap)); 1876 physmap_idx = 0; 1877 1878 /* 1879 * get memory map from INT 15:E820, kindly supplied by the loader. 1880 * 1881 * subr_module.c says: 1882 * "Consumer may safely assume that size value precedes data." 1883 * ie: an int32_t immediately precedes smap. 1884 */ 1885 efihdrbase = (struct efi_map_header *)preload_search_info(kmdp, 1886 MODINFO_METADATA | MODINFOMD_EFI_MAP); 1887 smapbase = (struct bios_smap *)preload_search_info(kmdp, 1888 MODINFO_METADATA | MODINFOMD_SMAP); 1889 if (smapbase == NULL && efihdrbase == NULL) 1890 panic("No BIOS smap or EFI map info from loader!"); 1891 1892 if (efihdrbase == NULL) 1893 add_smap_entries(&physmap_idx); 1894 else 1895 add_efi_map_entries(&physmap_idx); 1896 1897 base_memory = physmap[1] / 1024; 1898 /* make hole for AP bootstrap code */ 1899 physmap[1] = mp_bootaddress(base_memory); 1900 1901 /* Save EBDA address, if any */ 1902 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e)); 1903 ebda_addr <<= 4; 1904 1905 /* 1906 * Maxmem isn't the "maximum memory", it's one larger than the 1907 * highest page of the physical address space. It should be 1908 * called something like "Maxphyspage". We may adjust this 1909 * based on ``hw.physmem'' and the results of the memory test. 1910 */ 1911 Maxmem = atop(physmap[physmap_idx + 1]); 1912 1913 #ifdef MAXMEM 1914 Maxmem = MAXMEM / 4; 1915 #endif 1916 1917 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) 1918 Maxmem = atop(physmem_tunable); 1919 1920 /* 1921 * Don't allow MAXMEM or hw.physmem to extend the amount of memory 1922 * in the system. 1923 */ 1924 if (Maxmem > atop(physmap[physmap_idx + 1])) 1925 Maxmem = atop(physmap[physmap_idx + 1]); 1926 1927 /* 1928 * Blowing out the DMAP will blow up the system. 1929 */ 1930 if (Maxmem > atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS)) { 1931 kprintf("Limiting Maxmem due to DMAP size\n"); 1932 Maxmem = atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS); 1933 } 1934 1935 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1936 (boothowto & RB_VERBOSE)) { 1937 kprintf("Physical memory use set to %ldK\n", Maxmem * 4); 1938 } 1939 1940 /* 1941 * Call pmap initialization to make new kernel address space 1942 * 1943 * Mask off page 0. 1944 */ 1945 pmap_bootstrap(&first); 1946 physmap[0] = PAGE_SIZE; 1947 1948 /* 1949 * Align the physmap to PHYSMAP_ALIGN and cut out anything 1950 * exceeding Maxmem. 1951 */ 1952 for (i = j = 0; i <= physmap_idx; i += 2) { 1953 if (physmap[i+1] > ptoa(Maxmem)) 1954 physmap[i+1] = ptoa(Maxmem); 1955 physmap[i] = (physmap[i] + PHYSMAP_ALIGN_MASK) & 1956 ~PHYSMAP_ALIGN_MASK; 1957 physmap[i+1] = physmap[i+1] & ~PHYSMAP_ALIGN_MASK; 1958 1959 physmap[j] = physmap[i]; 1960 physmap[j+1] = physmap[i+1]; 1961 1962 if (physmap[i] < physmap[i+1]) 1963 j += 2; 1964 } 1965 physmap_idx = j - 2; 1966 1967 /* 1968 * Align anything else used in the validation loop. 1969 */ 1970 first = (first + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK; 1971 1972 /* 1973 * Size up each available chunk of physical memory. 1974 */ 1975 pa_indx = 0; 1976 da_indx = 1; 1977 phys_avail[pa_indx++] = physmap[0]; 1978 phys_avail[pa_indx] = physmap[0]; 1979 dump_avail[da_indx] = physmap[0]; 1980 pte = CMAP1; 1981 1982 /* 1983 * Get dcons buffer address 1984 */ 1985 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 || 1986 kgetenv_quad("dcons.size", &dcons_size) == 0) 1987 dcons_addr = 0; 1988 1989 /* 1990 * Validate the physical memory. The physical memory segments 1991 * have already been aligned to PHYSMAP_ALIGN which is a multiple 1992 * of PAGE_SIZE. 1993 */ 1994 for (i = 0; i <= physmap_idx; i += 2) { 1995 vm_paddr_t end; 1996 vm_paddr_t incr = PHYSMAP_ALIGN; 1997 1998 end = physmap[i + 1]; 1999 2000 for (pa = physmap[i]; pa < end; pa += incr) { 2001 int page_bad, full; 2002 volatile uint64_t *ptr = (uint64_t *)CADDR1; 2003 uint64_t tmp; 2004 2005 incr = PHYSMAP_ALIGN; 2006 full = FALSE; 2007 2008 /* 2009 * block out kernel memory as not available. 2010 */ 2011 if (pa >= 0x200000 && pa < first) 2012 goto do_dump_avail; 2013 2014 /* 2015 * block out dcons buffer 2016 */ 2017 if (dcons_addr > 0 2018 && pa >= trunc_page(dcons_addr) 2019 && pa < dcons_addr + dcons_size) { 2020 goto do_dump_avail; 2021 } 2022 2023 page_bad = FALSE; 2024 2025 /* 2026 * Always test the first and last block supplied in 2027 * the map entry, but it just takes too long to run 2028 * the test these days and we already have to skip 2029 * pages. Handwave it on PHYSMAP_HANDWAVE boundaries. 2030 */ 2031 if (pa != physmap[i]) { 2032 vm_paddr_t bytes = end - pa; 2033 if ((pa & PHYSMAP_HANDWAVE_MASK) == 0 && 2034 bytes >= PHYSMAP_HANDWAVE + PHYSMAP_ALIGN) { 2035 incr = PHYSMAP_HANDWAVE; 2036 goto handwaved; 2037 } 2038 } 2039 2040 /* 2041 * map page into kernel: valid, read/write,non-cacheable 2042 */ 2043 *pte = pa | 2044 kernel_pmap.pmap_bits[PG_V_IDX] | 2045 kernel_pmap.pmap_bits[PG_RW_IDX] | 2046 kernel_pmap.pmap_bits[PG_N_IDX]; 2047 cpu_invlpg(__DEVOLATILE(void *, ptr)); 2048 cpu_mfence(); 2049 2050 tmp = *ptr; 2051 /* 2052 * Test for alternating 1's and 0's 2053 */ 2054 *ptr = 0xaaaaaaaaaaaaaaaaLLU; 2055 cpu_mfence(); 2056 if (*ptr != 0xaaaaaaaaaaaaaaaaLLU) 2057 page_bad = TRUE; 2058 /* 2059 * Test for alternating 0's and 1's 2060 */ 2061 *ptr = 0x5555555555555555LLU; 2062 cpu_mfence(); 2063 if (*ptr != 0x5555555555555555LLU) 2064 page_bad = TRUE; 2065 /* 2066 * Test for all 1's 2067 */ 2068 *ptr = 0xffffffffffffffffLLU; 2069 cpu_mfence(); 2070 if (*ptr != 0xffffffffffffffffLLU) 2071 page_bad = TRUE; 2072 /* 2073 * Test for all 0's 2074 */ 2075 *ptr = 0x0; 2076 cpu_mfence(); 2077 if (*ptr != 0x0) 2078 page_bad = TRUE; 2079 /* 2080 * Restore original value. 2081 */ 2082 *ptr = tmp; 2083 handwaved: 2084 2085 /* 2086 * Adjust array of valid/good pages. 2087 */ 2088 if (page_bad == TRUE) 2089 continue; 2090 2091 /* 2092 * If this good page is a continuation of the 2093 * previous set of good pages, then just increase 2094 * the end pointer. Otherwise start a new chunk. 2095 * Note that "end" points one higher than end, 2096 * making the range >= start and < end. 2097 * If we're also doing a speculative memory 2098 * test and we at or past the end, bump up Maxmem 2099 * so that we keep going. The first bad page 2100 * will terminate the loop. 2101 */ 2102 if (phys_avail[pa_indx] == pa) { 2103 phys_avail[pa_indx] += incr; 2104 } else { 2105 pa_indx++; 2106 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 2107 kprintf( 2108 "Too many holes in the physical address space, giving up\n"); 2109 pa_indx--; 2110 full = TRUE; 2111 goto do_dump_avail; 2112 } 2113 phys_avail[pa_indx++] = pa; 2114 phys_avail[pa_indx] = pa + incr; 2115 } 2116 physmem += incr / PAGE_SIZE; 2117 do_dump_avail: 2118 if (dump_avail[da_indx] == pa) { 2119 dump_avail[da_indx] += incr; 2120 } else { 2121 da_indx++; 2122 if (da_indx == DUMP_AVAIL_ARRAY_END) { 2123 da_indx--; 2124 goto do_next; 2125 } 2126 dump_avail[da_indx++] = pa; 2127 dump_avail[da_indx] = pa + incr; 2128 } 2129 do_next: 2130 if (full) 2131 break; 2132 } 2133 } 2134 *pte = 0; 2135 cpu_invltlb(); 2136 cpu_mfence(); 2137 2138 /* 2139 * The last chunk must contain at least one page plus the message 2140 * buffer to avoid complicating other code (message buffer address 2141 * calculation, etc.). 2142 */ 2143 msgbuf_size = (MSGBUF_SIZE + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK; 2144 2145 while (phys_avail[pa_indx - 1] + PHYSMAP_ALIGN + 2146 msgbuf_size >= phys_avail[pa_indx]) { 2147 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 2148 phys_avail[pa_indx--] = 0; 2149 phys_avail[pa_indx--] = 0; 2150 } 2151 2152 Maxmem = atop(phys_avail[pa_indx]); 2153 2154 /* Trim off space for the message buffer. */ 2155 phys_avail[pa_indx] -= msgbuf_size; 2156 2157 avail_end = phys_avail[pa_indx]; 2158 2159 /* Map the message buffer. */ 2160 for (off = 0; off < msgbuf_size; off += PAGE_SIZE) { 2161 pmap_kenter((vm_offset_t)msgbufp + off, 2162 phys_avail[pa_indx] + off); 2163 } 2164 /* Try to get EFI framebuffer working as early as possible */ 2165 if (have_efi_framebuffer) 2166 efi_fb_init_vaddr(1); 2167 } 2168 2169 struct machintr_abi MachIntrABI; 2170 2171 /* 2172 * IDT VECTORS: 2173 * 0 Divide by zero 2174 * 1 Debug 2175 * 2 NMI 2176 * 3 BreakPoint 2177 * 4 OverFlow 2178 * 5 Bound-Range 2179 * 6 Invalid OpCode 2180 * 7 Device Not Available (x87) 2181 * 8 Double-Fault 2182 * 9 Coprocessor Segment overrun (unsupported, reserved) 2183 * 10 Invalid-TSS 2184 * 11 Segment not present 2185 * 12 Stack 2186 * 13 General Protection 2187 * 14 Page Fault 2188 * 15 Reserved 2189 * 16 x87 FP Exception pending 2190 * 17 Alignment Check 2191 * 18 Machine Check 2192 * 19 SIMD floating point 2193 * 20-31 reserved 2194 * 32-255 INTn/external sources 2195 */ 2196 u_int64_t 2197 hammer_time(u_int64_t modulep, u_int64_t physfree) 2198 { 2199 caddr_t kmdp; 2200 int gsel_tss, x, cpu; 2201 #if 0 /* JG */ 2202 int metadata_missing, off; 2203 #endif 2204 struct mdglobaldata *gd; 2205 u_int64_t msr; 2206 2207 /* 2208 * Prevent lowering of the ipl if we call tsleep() early. 2209 */ 2210 gd = &CPU_prvspace[0]->mdglobaldata; 2211 bzero(gd, sizeof(*gd)); 2212 2213 /* 2214 * Note: on both UP and SMP curthread must be set non-NULL 2215 * early in the boot sequence because the system assumes 2216 * that 'curthread' is never NULL. 2217 */ 2218 2219 gd->mi.gd_curthread = &thread0; 2220 thread0.td_gd = &gd->mi; 2221 2222 atdevbase = ISA_HOLE_START + PTOV_OFFSET; 2223 2224 #if 0 /* JG */ 2225 metadata_missing = 0; 2226 if (bootinfo.bi_modulep) { 2227 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 2228 preload_bootstrap_relocate(KERNBASE); 2229 } else { 2230 metadata_missing = 1; 2231 } 2232 if (bootinfo.bi_envp) 2233 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 2234 #endif 2235 2236 preload_metadata = (caddr_t)(uintptr_t)(modulep + PTOV_OFFSET); 2237 preload_bootstrap_relocate(PTOV_OFFSET); 2238 kmdp = preload_search_by_type("elf kernel"); 2239 if (kmdp == NULL) 2240 kmdp = preload_search_by_type("elf64 kernel"); 2241 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 2242 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + PTOV_OFFSET; 2243 #ifdef DDB 2244 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 2245 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 2246 #endif 2247 2248 if (boothowto & RB_VERBOSE) 2249 bootverbose++; 2250 2251 /* 2252 * Default MachIntrABI to ICU 2253 */ 2254 MachIntrABI = MachIntrABI_ICU; 2255 2256 /* 2257 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask, 2258 * and ncpus_fit_mask remain 0. 2259 */ 2260 ncpus = 1; 2261 ncpus2 = 1; 2262 ncpus_fit = 1; 2263 /* Init basic tunables, hz etc */ 2264 init_param1(); 2265 2266 /* 2267 * make gdt memory segments 2268 */ 2269 gdt_segs[GPROC0_SEL].ssd_base = 2270 (uintptr_t) &CPU_prvspace[0]->mdglobaldata.gd_common_tss; 2271 2272 gd->mi.gd_prvspace = CPU_prvspace[0]; 2273 2274 for (x = 0; x < NGDT; x++) { 2275 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1)) 2276 ssdtosd(&gdt_segs[x], &gdt[x]); 2277 } 2278 ssdtosyssd(&gdt_segs[GPROC0_SEL], 2279 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]); 2280 2281 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 2282 r_gdt.rd_base = (long) gdt; 2283 lgdt(&r_gdt); 2284 2285 wrmsr(MSR_FSBASE, 0); /* User value */ 2286 wrmsr(MSR_GSBASE, (u_int64_t)&gd->mi); 2287 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */ 2288 2289 mi_gdinit(&gd->mi, 0); 2290 cpu_gdinit(gd, 0); 2291 proc0paddr = proc0paddr_buff; 2292 mi_proc0init(&gd->mi, proc0paddr); 2293 safepri = TDPRI_MAX; 2294 2295 /* spinlocks and the BGL */ 2296 init_locks(); 2297 2298 /* exceptions */ 2299 for (x = 0; x < NIDT; x++) 2300 setidt_global(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 2301 setidt_global(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0); 2302 setidt_global(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0); 2303 setidt_global(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1); 2304 setidt_global(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0); 2305 setidt_global(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0); 2306 setidt_global(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0); 2307 setidt_global(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0); 2308 setidt_global(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0); 2309 setidt_global(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1); 2310 setidt_global(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0); 2311 setidt_global(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0); 2312 setidt_global(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0); 2313 setidt_global(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0); 2314 setidt_global(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0); 2315 setidt_global(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0); 2316 setidt_global(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0); 2317 setidt_global(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0); 2318 setidt_global(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0); 2319 setidt_global(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0); 2320 2321 for (cpu = 0; cpu < MAXCPU; ++cpu) { 2322 r_idt_arr[cpu].rd_limit = sizeof(idt_arr[cpu]) - 1; 2323 r_idt_arr[cpu].rd_base = (long) &idt_arr[cpu][0]; 2324 } 2325 2326 lidt(&r_idt_arr[0]); 2327 2328 /* 2329 * Initialize the console before we print anything out. 2330 */ 2331 cninit(); 2332 2333 #if 0 /* JG */ 2334 if (metadata_missing) 2335 kprintf("WARNING: loader(8) metadata is missing!\n"); 2336 #endif 2337 2338 #if NISA >0 2339 elcr_probe(); 2340 isa_defaultirq(); 2341 #endif 2342 rand_initialize(); 2343 2344 /* 2345 * Initialize IRQ mapping 2346 * 2347 * NOTE: 2348 * SHOULD be after elcr_probe() 2349 */ 2350 MachIntrABI_ICU.initmap(); 2351 MachIntrABI_IOAPIC.initmap(); 2352 2353 #ifdef DDB 2354 kdb_init(); 2355 if (boothowto & RB_KDB) 2356 Debugger("Boot flags requested debugger"); 2357 #endif 2358 2359 #if 0 /* JG */ 2360 finishidentcpu(); /* Final stage of CPU initialization */ 2361 setidt(6, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 2362 setidt(13, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 2363 #endif 2364 identify_cpu(); /* Final stage of CPU initialization */ 2365 initializecpu(0); /* Initialize CPU registers */ 2366 2367 /* 2368 * On modern intel cpus, haswell or later, cpu_idle_hlt=1 is better 2369 * because the cpu does significant power management in MWAIT 2370 * (also suggested is to set sysctl machdep.mwait.CX.idle=AUTODEEP). 2371 * 2372 * On modern amd cpus cpu_idle_hlt=3 is better, because the cpu does 2373 * significant power management in HLT or ACPI (but cpu_idle_hlt=1 2374 * would try to use MWAIT). 2375 * 2376 * On older amd or intel cpus, cpu_idle_hlt=2 is better because ACPI 2377 * is needed to reduce power consumption, but wakeup times are often 2378 * longer. 2379 */ 2380 if (cpu_vendor_id == CPU_VENDOR_INTEL && 2381 CPUID_TO_MODEL(cpu_id) >= 0x3C) { /* Haswell or later */ 2382 cpu_idle_hlt = 1; 2383 } 2384 if (cpu_vendor_id == CPU_VENDOR_AMD && 2385 CPUID_TO_FAMILY(cpu_id) >= 0x14) { /* Bobcat or later */ 2386 cpu_idle_hlt = 3; 2387 } 2388 2389 TUNABLE_INT_FETCH("hw.apic_io_enable", &ioapic_enable); /* for compat */ 2390 TUNABLE_INT_FETCH("hw.ioapic_enable", &ioapic_enable); 2391 TUNABLE_INT_FETCH("hw.lapic_enable", &lapic_enable); 2392 TUNABLE_INT_FETCH("machdep.cpu_idle_hlt", &cpu_idle_hlt); 2393 2394 /* 2395 * Some of the virtual machines do not work w/ I/O APIC 2396 * enabled. If the user does not explicitly enable or 2397 * disable the I/O APIC (ioapic_enable < 0), then we 2398 * disable I/O APIC on all virtual machines. 2399 * 2400 * NOTE: 2401 * This must be done after identify_cpu(), which sets 2402 * 'cpu_feature2' 2403 */ 2404 if (ioapic_enable < 0) { 2405 if (cpu_feature2 & CPUID2_VMM) 2406 ioapic_enable = 0; 2407 else 2408 ioapic_enable = 1; 2409 } 2410 2411 /* make an initial tss so cpu can get interrupt stack on syscall! */ 2412 gd->gd_common_tss.tss_rsp0 = 2413 (register_t)(thread0.td_kstack + 2414 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb)); 2415 /* Ensure the stack is aligned to 16 bytes */ 2416 gd->gd_common_tss.tss_rsp0 &= ~(register_t)0xF; 2417 2418 /* double fault stack */ 2419 gd->gd_common_tss.tss_ist1 = 2420 (long)&gd->mi.gd_prvspace->idlestack[ 2421 sizeof(gd->mi.gd_prvspace->idlestack)]; 2422 2423 /* Set the IO permission bitmap (empty due to tss seg limit) */ 2424 gd->gd_common_tss.tss_iobase = sizeof(struct x86_64tss); 2425 2426 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 2427 gd->gd_tss_gdt = &gdt[GPROC0_SEL]; 2428 gd->gd_common_tssd = *gd->gd_tss_gdt; 2429 ltr(gsel_tss); 2430 2431 /* Set up the fast syscall stuff */ 2432 msr = rdmsr(MSR_EFER) | EFER_SCE; 2433 wrmsr(MSR_EFER, msr); 2434 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall)); 2435 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32)); 2436 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) | 2437 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48); 2438 wrmsr(MSR_STAR, msr); 2439 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D|PSL_IOPL); 2440 2441 getmemsize(kmdp, physfree); 2442 init_param2(physmem); 2443 2444 /* now running on new page tables, configured,and u/iom is accessible */ 2445 2446 /* Map the message buffer. */ 2447 #if 0 /* JG */ 2448 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 2449 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 2450 #endif 2451 2452 msgbufinit(msgbufp, MSGBUF_SIZE); 2453 2454 2455 /* transfer to user mode */ 2456 2457 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); 2458 _udatasel = GSEL(GUDATA_SEL, SEL_UPL); 2459 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL); 2460 2461 load_ds(_udatasel); 2462 load_es(_udatasel); 2463 load_fs(_udatasel); 2464 2465 /* setup proc 0's pcb */ 2466 thread0.td_pcb->pcb_flags = 0; 2467 thread0.td_pcb->pcb_cr3 = KPML4phys; 2468 thread0.td_pcb->pcb_ext = NULL; 2469 lwp0.lwp_md.md_regs = &proc0_tf; /* XXX needed? */ 2470 2471 /* Location of kernel stack for locore */ 2472 return ((u_int64_t)thread0.td_pcb); 2473 } 2474 2475 /* 2476 * Initialize machine-dependant portions of the global data structure. 2477 * Note that the global data area and cpu0's idlestack in the private 2478 * data space were allocated in locore. 2479 * 2480 * Note: the idlethread's cpl is 0 2481 * 2482 * WARNING! Called from early boot, 'mycpu' may not work yet. 2483 */ 2484 void 2485 cpu_gdinit(struct mdglobaldata *gd, int cpu) 2486 { 2487 if (cpu) 2488 gd->mi.gd_curthread = &gd->mi.gd_idlethread; 2489 2490 lwkt_init_thread(&gd->mi.gd_idlethread, 2491 gd->mi.gd_prvspace->idlestack, 2492 sizeof(gd->mi.gd_prvspace->idlestack), 2493 0, &gd->mi); 2494 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu); 2495 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch; 2496 gd->mi.gd_idlethread.td_sp -= sizeof(void *); 2497 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore; 2498 } 2499 2500 /* 2501 * We only have to check for DMAP bounds, the globaldata space is 2502 * actually part of the kernel_map so we don't have to waste time 2503 * checking CPU_prvspace[*]. 2504 */ 2505 int 2506 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr) 2507 { 2508 #if 0 2509 if (saddr >= (vm_offset_t)&CPU_prvspace[0] && 2510 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) { 2511 return (TRUE); 2512 } 2513 #endif 2514 if (saddr >= DMAP_MIN_ADDRESS && eaddr <= DMAP_MAX_ADDRESS) 2515 return (TRUE); 2516 return (FALSE); 2517 } 2518 2519 struct globaldata * 2520 globaldata_find(int cpu) 2521 { 2522 KKASSERT(cpu >= 0 && cpu < ncpus); 2523 return(&CPU_prvspace[cpu]->mdglobaldata.mi); 2524 } 2525 2526 /* 2527 * This path should be safe from the SYSRET issue because only stopped threads 2528 * can have their %rip adjusted this way (and all heavy weight thread switches 2529 * clear QUICKREF and thus do not use SYSRET). However, the code path is 2530 * convoluted so add a safety by forcing %rip to be cannonical. 2531 */ 2532 int 2533 ptrace_set_pc(struct lwp *lp, unsigned long addr) 2534 { 2535 if (addr & 0x0000800000000000LLU) 2536 lp->lwp_md.md_regs->tf_rip = addr | 0xFFFF000000000000LLU; 2537 else 2538 lp->lwp_md.md_regs->tf_rip = addr & 0x0000FFFFFFFFFFFFLLU; 2539 return (0); 2540 } 2541 2542 int 2543 ptrace_single_step(struct lwp *lp) 2544 { 2545 lp->lwp_md.md_regs->tf_rflags |= PSL_T; 2546 return (0); 2547 } 2548 2549 int 2550 fill_regs(struct lwp *lp, struct reg *regs) 2551 { 2552 struct trapframe *tp; 2553 2554 if ((tp = lp->lwp_md.md_regs) == NULL) 2555 return EINVAL; 2556 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs)); 2557 return (0); 2558 } 2559 2560 int 2561 set_regs(struct lwp *lp, struct reg *regs) 2562 { 2563 struct trapframe *tp; 2564 2565 tp = lp->lwp_md.md_regs; 2566 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) || 2567 !CS_SECURE(regs->r_cs)) 2568 return (EINVAL); 2569 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs)); 2570 clear_quickret(); 2571 return (0); 2572 } 2573 2574 static void 2575 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87) 2576 { 2577 struct env87 *penv_87 = &sv_87->sv_env; 2578 struct envxmm *penv_xmm = &sv_xmm->sv_env; 2579 int i; 2580 2581 /* FPU control/status */ 2582 penv_87->en_cw = penv_xmm->en_cw; 2583 penv_87->en_sw = penv_xmm->en_sw; 2584 penv_87->en_tw = penv_xmm->en_tw; 2585 penv_87->en_fip = penv_xmm->en_fip; 2586 penv_87->en_fcs = penv_xmm->en_fcs; 2587 penv_87->en_opcode = penv_xmm->en_opcode; 2588 penv_87->en_foo = penv_xmm->en_foo; 2589 penv_87->en_fos = penv_xmm->en_fos; 2590 2591 /* FPU registers */ 2592 for (i = 0; i < 8; ++i) 2593 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 2594 } 2595 2596 static void 2597 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm) 2598 { 2599 struct env87 *penv_87 = &sv_87->sv_env; 2600 struct envxmm *penv_xmm = &sv_xmm->sv_env; 2601 int i; 2602 2603 /* FPU control/status */ 2604 penv_xmm->en_cw = penv_87->en_cw; 2605 penv_xmm->en_sw = penv_87->en_sw; 2606 penv_xmm->en_tw = penv_87->en_tw; 2607 penv_xmm->en_fip = penv_87->en_fip; 2608 penv_xmm->en_fcs = penv_87->en_fcs; 2609 penv_xmm->en_opcode = penv_87->en_opcode; 2610 penv_xmm->en_foo = penv_87->en_foo; 2611 penv_xmm->en_fos = penv_87->en_fos; 2612 2613 /* FPU registers */ 2614 for (i = 0; i < 8; ++i) 2615 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 2616 } 2617 2618 int 2619 fill_fpregs(struct lwp *lp, struct fpreg *fpregs) 2620 { 2621 if (lp->lwp_thread == NULL || lp->lwp_thread->td_pcb == NULL) 2622 return EINVAL; 2623 if (cpu_fxsr) { 2624 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm, 2625 (struct save87 *)fpregs); 2626 return (0); 2627 } 2628 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 2629 return (0); 2630 } 2631 2632 int 2633 set_fpregs(struct lwp *lp, struct fpreg *fpregs) 2634 { 2635 if (cpu_fxsr) { 2636 set_fpregs_xmm((struct save87 *)fpregs, 2637 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm); 2638 return (0); 2639 } 2640 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs); 2641 return (0); 2642 } 2643 2644 int 2645 fill_dbregs(struct lwp *lp, struct dbreg *dbregs) 2646 { 2647 struct pcb *pcb; 2648 2649 if (lp == NULL) { 2650 dbregs->dr[0] = rdr0(); 2651 dbregs->dr[1] = rdr1(); 2652 dbregs->dr[2] = rdr2(); 2653 dbregs->dr[3] = rdr3(); 2654 dbregs->dr[4] = rdr4(); 2655 dbregs->dr[5] = rdr5(); 2656 dbregs->dr[6] = rdr6(); 2657 dbregs->dr[7] = rdr7(); 2658 return (0); 2659 } 2660 if (lp->lwp_thread == NULL || (pcb = lp->lwp_thread->td_pcb) == NULL) 2661 return EINVAL; 2662 dbregs->dr[0] = pcb->pcb_dr0; 2663 dbregs->dr[1] = pcb->pcb_dr1; 2664 dbregs->dr[2] = pcb->pcb_dr2; 2665 dbregs->dr[3] = pcb->pcb_dr3; 2666 dbregs->dr[4] = 0; 2667 dbregs->dr[5] = 0; 2668 dbregs->dr[6] = pcb->pcb_dr6; 2669 dbregs->dr[7] = pcb->pcb_dr7; 2670 return (0); 2671 } 2672 2673 int 2674 set_dbregs(struct lwp *lp, struct dbreg *dbregs) 2675 { 2676 if (lp == NULL) { 2677 load_dr0(dbregs->dr[0]); 2678 load_dr1(dbregs->dr[1]); 2679 load_dr2(dbregs->dr[2]); 2680 load_dr3(dbregs->dr[3]); 2681 load_dr4(dbregs->dr[4]); 2682 load_dr5(dbregs->dr[5]); 2683 load_dr6(dbregs->dr[6]); 2684 load_dr7(dbregs->dr[7]); 2685 } else { 2686 struct pcb *pcb; 2687 struct ucred *ucred; 2688 int i; 2689 uint64_t mask1, mask2; 2690 2691 /* 2692 * Don't let an illegal value for dr7 get set. Specifically, 2693 * check for undefined settings. Setting these bit patterns 2694 * result in undefined behaviour and can lead to an unexpected 2695 * TRCTRAP. 2696 */ 2697 /* JG this loop looks unreadable */ 2698 /* Check 4 2-bit fields for invalid patterns. 2699 * These fields are R/Wi, for i = 0..3 2700 */ 2701 /* Is 10 in LENi allowed when running in compatibility mode? */ 2702 /* Pattern 10 in R/Wi might be used to indicate 2703 * breakpoint on I/O. Further analysis should be 2704 * carried to decide if it is safe and useful to 2705 * provide access to that capability 2706 */ 2707 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 4; 2708 i++, mask1 <<= 4, mask2 <<= 4) 2709 if ((dbregs->dr[7] & mask1) == mask2) 2710 return (EINVAL); 2711 2712 pcb = lp->lwp_thread->td_pcb; 2713 ucred = lp->lwp_proc->p_ucred; 2714 2715 /* 2716 * Don't let a process set a breakpoint that is not within the 2717 * process's address space. If a process could do this, it 2718 * could halt the system by setting a breakpoint in the kernel 2719 * (if ddb was enabled). Thus, we need to check to make sure 2720 * that no breakpoints are being enabled for addresses outside 2721 * process's address space, unless, perhaps, we were called by 2722 * uid 0. 2723 * 2724 * XXX - what about when the watched area of the user's 2725 * address space is written into from within the kernel 2726 * ... wouldn't that still cause a breakpoint to be generated 2727 * from within kernel mode? 2728 */ 2729 2730 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) { 2731 if (dbregs->dr[7] & 0x3) { 2732 /* dr0 is enabled */ 2733 if (dbregs->dr[0] >= VM_MAX_USER_ADDRESS) 2734 return (EINVAL); 2735 } 2736 2737 if (dbregs->dr[7] & (0x3<<2)) { 2738 /* dr1 is enabled */ 2739 if (dbregs->dr[1] >= VM_MAX_USER_ADDRESS) 2740 return (EINVAL); 2741 } 2742 2743 if (dbregs->dr[7] & (0x3<<4)) { 2744 /* dr2 is enabled */ 2745 if (dbregs->dr[2] >= VM_MAX_USER_ADDRESS) 2746 return (EINVAL); 2747 } 2748 2749 if (dbregs->dr[7] & (0x3<<6)) { 2750 /* dr3 is enabled */ 2751 if (dbregs->dr[3] >= VM_MAX_USER_ADDRESS) 2752 return (EINVAL); 2753 } 2754 } 2755 2756 pcb->pcb_dr0 = dbregs->dr[0]; 2757 pcb->pcb_dr1 = dbregs->dr[1]; 2758 pcb->pcb_dr2 = dbregs->dr[2]; 2759 pcb->pcb_dr3 = dbregs->dr[3]; 2760 pcb->pcb_dr6 = dbregs->dr[6]; 2761 pcb->pcb_dr7 = dbregs->dr[7]; 2762 2763 pcb->pcb_flags |= PCB_DBREGS; 2764 } 2765 2766 return (0); 2767 } 2768 2769 /* 2770 * Return > 0 if a hardware breakpoint has been hit, and the 2771 * breakpoint was in user space. Return 0, otherwise. 2772 */ 2773 int 2774 user_dbreg_trap(void) 2775 { 2776 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */ 2777 u_int64_t bp; /* breakpoint bits extracted from dr6 */ 2778 int nbp; /* number of breakpoints that triggered */ 2779 caddr_t addr[4]; /* breakpoint addresses */ 2780 int i; 2781 2782 dr7 = rdr7(); 2783 if ((dr7 & 0xff) == 0) { 2784 /* 2785 * all GE and LE bits in the dr7 register are zero, 2786 * thus the trap couldn't have been caused by the 2787 * hardware debug registers 2788 */ 2789 return 0; 2790 } 2791 2792 nbp = 0; 2793 dr6 = rdr6(); 2794 bp = dr6 & 0xf; 2795 2796 if (bp == 0) { 2797 /* 2798 * None of the breakpoint bits are set meaning this 2799 * trap was not caused by any of the debug registers 2800 */ 2801 return 0; 2802 } 2803 2804 /* 2805 * at least one of the breakpoints were hit, check to see 2806 * which ones and if any of them are user space addresses 2807 */ 2808 2809 if (bp & 0x01) { 2810 addr[nbp++] = (caddr_t)rdr0(); 2811 } 2812 if (bp & 0x02) { 2813 addr[nbp++] = (caddr_t)rdr1(); 2814 } 2815 if (bp & 0x04) { 2816 addr[nbp++] = (caddr_t)rdr2(); 2817 } 2818 if (bp & 0x08) { 2819 addr[nbp++] = (caddr_t)rdr3(); 2820 } 2821 2822 for (i=0; i<nbp; i++) { 2823 if (addr[i] < 2824 (caddr_t)VM_MAX_USER_ADDRESS) { 2825 /* 2826 * addr[i] is in user space 2827 */ 2828 return nbp; 2829 } 2830 } 2831 2832 /* 2833 * None of the breakpoints are in user space. 2834 */ 2835 return 0; 2836 } 2837 2838 2839 #ifndef DDB 2840 void 2841 Debugger(const char *msg) 2842 { 2843 kprintf("Debugger(\"%s\") called.\n", msg); 2844 } 2845 #endif /* no DDB */ 2846 2847 #ifdef DDB 2848 2849 /* 2850 * Provide inb() and outb() as functions. They are normally only 2851 * available as macros calling inlined functions, thus cannot be 2852 * called inside DDB. 2853 * 2854 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2855 */ 2856 2857 #undef inb 2858 #undef outb 2859 2860 /* silence compiler warnings */ 2861 u_char inb(u_int); 2862 void outb(u_int, u_char); 2863 2864 u_char 2865 inb(u_int port) 2866 { 2867 u_char data; 2868 /* 2869 * We use %%dx and not %1 here because i/o is done at %dx and not at 2870 * %edx, while gcc generates inferior code (movw instead of movl) 2871 * if we tell it to load (u_short) port. 2872 */ 2873 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2874 return (data); 2875 } 2876 2877 void 2878 outb(u_int port, u_char data) 2879 { 2880 u_char al; 2881 /* 2882 * Use an unnecessary assignment to help gcc's register allocator. 2883 * This make a large difference for gcc-1.40 and a tiny difference 2884 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2885 * best results. gcc-2.6.0 can't handle this. 2886 */ 2887 al = data; 2888 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2889 } 2890 2891 #endif /* DDB */ 2892 2893 2894 2895 /* 2896 * initialize all the SMP locks 2897 */ 2898 2899 /* critical region when masking or unmasking interupts */ 2900 struct spinlock_deprecated imen_spinlock; 2901 2902 /* lock region used by kernel profiling */ 2903 struct spinlock_deprecated mcount_spinlock; 2904 2905 /* locks com (tty) data/hardware accesses: a FASTINTR() */ 2906 struct spinlock_deprecated com_spinlock; 2907 2908 /* lock regions around the clock hardware */ 2909 struct spinlock_deprecated clock_spinlock; 2910 2911 static void 2912 init_locks(void) 2913 { 2914 /* 2915 * Get the initial mplock with a count of 1 for the BSP. 2916 * This uses a LOGICAL cpu ID, ie BSP == 0. 2917 */ 2918 cpu_get_initial_mplock(); 2919 /* DEPRECATED */ 2920 spin_init_deprecated(&mcount_spinlock); 2921 spin_init_deprecated(&imen_spinlock); 2922 spin_init_deprecated(&com_spinlock); 2923 spin_init_deprecated(&clock_spinlock); 2924 2925 /* our token pool needs to work early */ 2926 lwkt_token_pool_init(); 2927 } 2928 2929 boolean_t 2930 cpu_mwait_hint_valid(uint32_t hint) 2931 { 2932 int cx_idx, sub; 2933 2934 cx_idx = MWAIT_EAX_TO_CX(hint); 2935 if (cx_idx >= CPU_MWAIT_CX_MAX) 2936 return FALSE; 2937 2938 sub = MWAIT_EAX_TO_CX_SUB(hint); 2939 if (sub >= cpu_mwait_cx_info[cx_idx].subcnt) 2940 return FALSE; 2941 2942 return TRUE; 2943 } 2944 2945 void 2946 cpu_mwait_cx_no_bmsts(void) 2947 { 2948 atomic_clear_int(&cpu_mwait_c3_preamble, CPU_MWAIT_C3_PREAMBLE_BM_STS); 2949 } 2950 2951 void 2952 cpu_mwait_cx_no_bmarb(void) 2953 { 2954 atomic_clear_int(&cpu_mwait_c3_preamble, CPU_MWAIT_C3_PREAMBLE_BM_ARB); 2955 } 2956 2957 static int 2958 cpu_mwait_cx_hint2name(int hint, char *name, int namelen, boolean_t allow_auto) 2959 { 2960 int old_cx_idx, sub = 0; 2961 2962 if (hint >= 0) { 2963 old_cx_idx = MWAIT_EAX_TO_CX(hint); 2964 sub = MWAIT_EAX_TO_CX_SUB(hint); 2965 } else if (hint == CPU_MWAIT_HINT_AUTO) { 2966 old_cx_idx = allow_auto ? CPU_MWAIT_C2 : CPU_MWAIT_CX_MAX; 2967 } else if (hint == CPU_MWAIT_HINT_AUTODEEP) { 2968 old_cx_idx = allow_auto ? CPU_MWAIT_C3 : CPU_MWAIT_CX_MAX; 2969 } else { 2970 old_cx_idx = CPU_MWAIT_CX_MAX; 2971 } 2972 2973 if (!CPU_MWAIT_HAS_CX) 2974 strlcpy(name, "NONE", namelen); 2975 else if (allow_auto && hint == CPU_MWAIT_HINT_AUTO) 2976 strlcpy(name, "AUTO", namelen); 2977 else if (allow_auto && hint == CPU_MWAIT_HINT_AUTODEEP) 2978 strlcpy(name, "AUTODEEP", namelen); 2979 else if (old_cx_idx >= CPU_MWAIT_CX_MAX || 2980 sub >= cpu_mwait_cx_info[old_cx_idx].subcnt) 2981 strlcpy(name, "INVALID", namelen); 2982 else 2983 ksnprintf(name, namelen, "C%d/%d", old_cx_idx, sub); 2984 2985 return old_cx_idx; 2986 } 2987 2988 static int 2989 cpu_mwait_cx_name2hint(char *name, int *hint0, boolean_t allow_auto) 2990 { 2991 int cx_idx, sub, hint; 2992 char *ptr, *start; 2993 2994 if (allow_auto && strcmp(name, "AUTO") == 0) { 2995 hint = CPU_MWAIT_HINT_AUTO; 2996 cx_idx = CPU_MWAIT_C2; 2997 goto done; 2998 } 2999 if (allow_auto && strcmp(name, "AUTODEEP") == 0) { 3000 hint = CPU_MWAIT_HINT_AUTODEEP; 3001 cx_idx = CPU_MWAIT_C3; 3002 goto done; 3003 } 3004 3005 if (strlen(name) < 4 || toupper(name[0]) != 'C') 3006 return -1; 3007 start = &name[1]; 3008 ptr = NULL; 3009 3010 cx_idx = strtol(start, &ptr, 10); 3011 if (ptr == start || *ptr != '/') 3012 return -1; 3013 if (cx_idx < 0 || cx_idx >= CPU_MWAIT_CX_MAX) 3014 return -1; 3015 3016 start = ptr + 1; 3017 ptr = NULL; 3018 3019 sub = strtol(start, &ptr, 10); 3020 if (*ptr != '\0') 3021 return -1; 3022 if (sub < 0 || sub >= cpu_mwait_cx_info[cx_idx].subcnt) 3023 return -1; 3024 3025 hint = MWAIT_EAX_HINT(cx_idx, sub); 3026 done: 3027 *hint0 = hint; 3028 return cx_idx; 3029 } 3030 3031 static int 3032 cpu_mwait_cx_transit(int old_cx_idx, int cx_idx) 3033 { 3034 if (cx_idx >= CPU_MWAIT_C3 && cpu_mwait_c3_preamble) 3035 return EOPNOTSUPP; 3036 if (old_cx_idx < CPU_MWAIT_C3 && cx_idx >= CPU_MWAIT_C3) { 3037 int error; 3038 3039 error = cputimer_intr_powersave_addreq(); 3040 if (error) 3041 return error; 3042 } else if (old_cx_idx >= CPU_MWAIT_C3 && cx_idx < CPU_MWAIT_C3) { 3043 cputimer_intr_powersave_remreq(); 3044 } 3045 return 0; 3046 } 3047 3048 static int 3049 cpu_mwait_cx_select_sysctl(SYSCTL_HANDLER_ARGS, int *hint0, 3050 boolean_t allow_auto) 3051 { 3052 int error, cx_idx, old_cx_idx, hint; 3053 char name[CPU_MWAIT_CX_NAMELEN]; 3054 3055 hint = *hint0; 3056 old_cx_idx = cpu_mwait_cx_hint2name(hint, name, sizeof(name), 3057 allow_auto); 3058 3059 error = sysctl_handle_string(oidp, name, sizeof(name), req); 3060 if (error != 0 || req->newptr == NULL) 3061 return error; 3062 3063 if (!CPU_MWAIT_HAS_CX) 3064 return EOPNOTSUPP; 3065 3066 cx_idx = cpu_mwait_cx_name2hint(name, &hint, allow_auto); 3067 if (cx_idx < 0) 3068 return EINVAL; 3069 3070 error = cpu_mwait_cx_transit(old_cx_idx, cx_idx); 3071 if (error) 3072 return error; 3073 3074 *hint0 = hint; 3075 return 0; 3076 } 3077 3078 static int 3079 cpu_mwait_cx_setname(struct cpu_idle_stat *stat, const char *cx_name) 3080 { 3081 int error, cx_idx, old_cx_idx, hint; 3082 char name[CPU_MWAIT_CX_NAMELEN]; 3083 3084 KASSERT(CPU_MWAIT_HAS_CX, ("cpu does not support mwait CX extension")); 3085 3086 hint = stat->hint; 3087 old_cx_idx = cpu_mwait_cx_hint2name(hint, name, sizeof(name), TRUE); 3088 3089 strlcpy(name, cx_name, sizeof(name)); 3090 cx_idx = cpu_mwait_cx_name2hint(name, &hint, TRUE); 3091 if (cx_idx < 0) 3092 return EINVAL; 3093 3094 error = cpu_mwait_cx_transit(old_cx_idx, cx_idx); 3095 if (error) 3096 return error; 3097 3098 stat->hint = hint; 3099 return 0; 3100 } 3101 3102 static int 3103 cpu_mwait_cx_idle_sysctl(SYSCTL_HANDLER_ARGS) 3104 { 3105 int hint = cpu_mwait_halt_global; 3106 int error, cx_idx, cpu; 3107 char name[CPU_MWAIT_CX_NAMELEN], cx_name[CPU_MWAIT_CX_NAMELEN]; 3108 3109 cpu_mwait_cx_hint2name(hint, name, sizeof(name), TRUE); 3110 3111 error = sysctl_handle_string(oidp, name, sizeof(name), req); 3112 if (error != 0 || req->newptr == NULL) 3113 return error; 3114 3115 if (!CPU_MWAIT_HAS_CX) 3116 return EOPNOTSUPP; 3117 3118 /* Save name for later per-cpu CX configuration */ 3119 strlcpy(cx_name, name, sizeof(cx_name)); 3120 3121 cx_idx = cpu_mwait_cx_name2hint(name, &hint, TRUE); 3122 if (cx_idx < 0) 3123 return EINVAL; 3124 3125 /* Change per-cpu CX configuration */ 3126 for (cpu = 0; cpu < ncpus; ++cpu) { 3127 error = cpu_mwait_cx_setname(&cpu_idle_stats[cpu], cx_name); 3128 if (error) 3129 return error; 3130 } 3131 3132 cpu_mwait_halt_global = hint; 3133 return 0; 3134 } 3135 3136 static int 3137 cpu_mwait_cx_pcpu_idle_sysctl(SYSCTL_HANDLER_ARGS) 3138 { 3139 struct cpu_idle_stat *stat = arg1; 3140 int error; 3141 3142 error = cpu_mwait_cx_select_sysctl(oidp, arg1, arg2, req, 3143 &stat->hint, TRUE); 3144 return error; 3145 } 3146 3147 static int 3148 cpu_mwait_cx_spin_sysctl(SYSCTL_HANDLER_ARGS) 3149 { 3150 int error; 3151 3152 error = cpu_mwait_cx_select_sysctl(oidp, arg1, arg2, req, 3153 &cpu_mwait_spin, FALSE); 3154 return error; 3155 } 3156 3157 /* 3158 * This manual debugging code is called unconditionally from Xtimer 3159 * (the per-cpu timer interrupt) whether the current thread is in a 3160 * critical section or not) and can be useful in tracking down lockups. 3161 * 3162 * NOTE: MANUAL DEBUG CODE 3163 */ 3164 #if 0 3165 static int saveticks[SMP_MAXCPU]; 3166 static int savecounts[SMP_MAXCPU]; 3167 #endif 3168 3169 void 3170 pcpu_timer_always(struct intrframe *frame) 3171 { 3172 #if 0 3173 globaldata_t gd = mycpu; 3174 int cpu = gd->gd_cpuid; 3175 char buf[64]; 3176 short *gptr; 3177 int i; 3178 3179 if (cpu <= 20) { 3180 gptr = (short *)0xFFFFFFFF800b8000 + 80 * cpu; 3181 *gptr = ((*gptr + 1) & 0x00FF) | 0x0700; 3182 ++gptr; 3183 3184 ksnprintf(buf, sizeof(buf), " %p %16s %d %16s ", 3185 (void *)frame->if_rip, gd->gd_curthread->td_comm, ticks, 3186 gd->gd_infomsg); 3187 for (i = 0; buf[i]; ++i) { 3188 gptr[i] = 0x0700 | (unsigned char)buf[i]; 3189 } 3190 } 3191 #if 0 3192 if (saveticks[gd->gd_cpuid] != ticks) { 3193 saveticks[gd->gd_cpuid] = ticks; 3194 savecounts[gd->gd_cpuid] = 0; 3195 } 3196 ++savecounts[gd->gd_cpuid]; 3197 if (savecounts[gd->gd_cpuid] > 2000 && panicstr == NULL) { 3198 panic("cpud %d panicing on ticks failure", 3199 gd->gd_cpuid); 3200 } 3201 for (i = 0; i < ncpus; ++i) { 3202 int delta; 3203 if (saveticks[i] && panicstr == NULL) { 3204 delta = saveticks[i] - ticks; 3205 if (delta < -10 || delta > 10) { 3206 panic("cpu %d panicing on cpu %d watchdog", 3207 gd->gd_cpuid, i); 3208 } 3209 } 3210 } 3211 #endif 3212 #endif 3213 } 3214