1 /*- 2 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 3 * Copyright (C) 1995, 1996 TooLs GmbH. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by TooLs GmbH. 17 * 4. The name of TooLs GmbH may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (C) 2001 Benno Rice 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 44 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 45 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 47 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 49 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 50 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 51 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 52 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 53 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $ 55 */ 56 57 #include <sys/cdefs.h> 58 __FBSDID("$FreeBSD$"); 59 60 #include "opt_compat.h" 61 #include "opt_ddb.h" 62 #include "opt_kstack_pages.h" 63 #include "opt_platform.h" 64 65 #include <sys/param.h> 66 #include <sys/proc.h> 67 #include <sys/systm.h> 68 #include <sys/bio.h> 69 #include <sys/buf.h> 70 #include <sys/bus.h> 71 #include <sys/cons.h> 72 #include <sys/cpu.h> 73 #include <sys/eventhandler.h> 74 #include <sys/exec.h> 75 #include <sys/imgact.h> 76 #include <sys/kdb.h> 77 #include <sys/kernel.h> 78 #include <sys/ktr.h> 79 #include <sys/linker.h> 80 #include <sys/lock.h> 81 #include <sys/malloc.h> 82 #include <sys/mbuf.h> 83 #include <sys/msgbuf.h> 84 #include <sys/mutex.h> 85 #include <sys/ptrace.h> 86 #include <sys/reboot.h> 87 #include <sys/rwlock.h> 88 #include <sys/signalvar.h> 89 #include <sys/syscallsubr.h> 90 #include <sys/sysctl.h> 91 #include <sys/sysent.h> 92 #include <sys/sysproto.h> 93 #include <sys/ucontext.h> 94 #include <sys/uio.h> 95 #include <sys/vmmeter.h> 96 #include <sys/vnode.h> 97 98 #include <net/netisr.h> 99 100 #include <vm/vm.h> 101 #include <vm/vm_extern.h> 102 #include <vm/vm_kern.h> 103 #include <vm/vm_page.h> 104 #include <vm/vm_map.h> 105 #include <vm/vm_object.h> 106 #include <vm/vm_pager.h> 107 108 #include <machine/altivec.h> 109 #ifndef __powerpc64__ 110 #include <machine/bat.h> 111 #endif 112 #include <machine/cpu.h> 113 #include <machine/elf.h> 114 #include <machine/fpu.h> 115 #include <machine/hid.h> 116 #include <machine/kdb.h> 117 #include <machine/md_var.h> 118 #include <machine/metadata.h> 119 #include <machine/mmuvar.h> 120 #include <machine/pcb.h> 121 #include <machine/reg.h> 122 #include <machine/sigframe.h> 123 #include <machine/spr.h> 124 #include <machine/trap.h> 125 #include <machine/vmparam.h> 126 #include <machine/ofw_machdep.h> 127 128 #include <ddb/ddb.h> 129 130 #include <dev/ofw/openfirm.h> 131 #include <dev/ofw/ofw_subr.h> 132 133 int cold = 1; 134 #ifdef __powerpc64__ 135 int cacheline_size = 128; 136 #else 137 int cacheline_size = 32; 138 #endif 139 int hw_direct_map = 1; 140 141 extern void *ap_pcpu; 142 143 struct pcpu __pcpu[MAXCPU]; 144 static char init_kenv[2048]; 145 146 static struct trapframe frame0; 147 148 char machine[] = "powerpc"; 149 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 150 151 static void cpu_startup(void *); 152 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 153 154 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size, 155 CTLFLAG_RD, &cacheline_size, 0, ""); 156 157 uintptr_t powerpc_init(vm_offset_t, vm_offset_t, vm_offset_t, void *); 158 159 long Maxmem = 0; 160 long realmem = 0; 161 162 struct kva_md_info kmi; 163 164 static void 165 cpu_startup(void *dummy) 166 { 167 168 /* 169 * Initialise the decrementer-based clock. 170 */ 171 decr_init(); 172 173 /* 174 * Good {morning,afternoon,evening,night}. 175 */ 176 cpu_setup(PCPU_GET(cpuid)); 177 178 #ifdef PERFMON 179 perfmon_init(); 180 #endif 181 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem), 182 ptoa((uintmax_t)physmem) / 1048576); 183 realmem = physmem; 184 185 if (bootverbose) 186 printf("available KVA = %zu (%zu MB)\n", 187 virtual_end - virtual_avail, 188 (virtual_end - virtual_avail) / 1048576); 189 190 /* 191 * Display any holes after the first chunk of extended memory. 192 */ 193 if (bootverbose) { 194 int indx; 195 196 printf("Physical memory chunk(s):\n"); 197 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 198 vm_paddr_t size1 = 199 phys_avail[indx + 1] - phys_avail[indx]; 200 201 #ifdef __powerpc64__ 202 printf("0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 203 #else 204 printf("0x%09jx - 0x%09jx, %ju bytes (%ju pages)\n", 205 #endif 206 (uintmax_t)phys_avail[indx], 207 (uintmax_t)phys_avail[indx + 1] - 1, 208 (uintmax_t)size1, (uintmax_t)size1 / PAGE_SIZE); 209 } 210 } 211 212 vm_ksubmap_init(&kmi); 213 214 printf("avail memory = %ju (%ju MB)\n", 215 ptoa((uintmax_t)vm_cnt.v_free_count), 216 ptoa((uintmax_t)vm_cnt.v_free_count) / 1048576); 217 218 /* 219 * Set up buffers, so they can be used to read disk labels. 220 */ 221 bufinit(); 222 vm_pager_bufferinit(); 223 } 224 225 extern vm_offset_t __startkernel, __endkernel; 226 extern unsigned char __bss_start[]; 227 extern unsigned char __sbss_start[]; 228 extern unsigned char __sbss_end[]; 229 extern unsigned char _end[]; 230 231 void aim_cpu_init(vm_offset_t toc); 232 void booke_cpu_init(void); 233 234 uintptr_t 235 powerpc_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, void *mdp) 236 { 237 struct pcpu *pc; 238 vm_offset_t startkernel, endkernel; 239 void *kmdp; 240 char *env; 241 bool ofw_bootargs = false; 242 #ifdef DDB 243 vm_offset_t ksym_start; 244 vm_offset_t ksym_end; 245 #endif 246 247 kmdp = NULL; 248 249 /* First guess at start/end kernel positions */ 250 startkernel = __startkernel; 251 endkernel = __endkernel; 252 253 /* Check for ePAPR loader, which puts a magic value into r6 */ 254 if (mdp == (void *)0x65504150) 255 mdp = NULL; 256 257 #ifdef AIM 258 /* 259 * If running from an FDT, make sure we are in real mode to avoid 260 * tromping on firmware page tables. Everything in the kernel assumes 261 * 1:1 mappings out of firmware, so this won't break anything not 262 * already broken. This doesn't work if there is live OF, since OF 263 * may internally use non-1:1 mappings. 264 */ 265 if (ofentry == 0) 266 mtmsr(mfmsr() & ~(PSL_IR | PSL_DR)); 267 #endif 268 269 /* 270 * Parse metadata if present and fetch parameters. Must be done 271 * before console is inited so cninit gets the right value of 272 * boothowto. 273 */ 274 if (mdp != NULL) { 275 preload_metadata = mdp; 276 kmdp = preload_search_by_type("elf kernel"); 277 if (kmdp != NULL) { 278 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 279 init_static_kenv(MD_FETCH(kmdp, MODINFOMD_ENVP, char *), 280 0); 281 endkernel = ulmax(endkernel, MD_FETCH(kmdp, 282 MODINFOMD_KERNEND, vm_offset_t)); 283 #ifdef DDB 284 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 285 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 286 db_fetch_ksymtab(ksym_start, ksym_end); 287 #endif 288 } 289 } else { 290 #if !defined(BOOKE) 291 /* 292 * On BOOKE the BSS is already cleared and some variables 293 * initialized. Do not wipe them out. 294 */ 295 bzero(__sbss_start, __sbss_end - __sbss_start); 296 bzero(__bss_start, _end - __bss_start); 297 #endif 298 init_static_kenv(init_kenv, sizeof(init_kenv)); 299 ofw_bootargs = true; 300 } 301 /* Store boot environment state */ 302 OF_initial_setup((void *)fdt, NULL, (int (*)(void *))ofentry); 303 304 /* 305 * Init params/tunables that can be overridden by the loader 306 */ 307 init_param1(); 308 309 /* 310 * Start initializing proc0 and thread0. 311 */ 312 proc_linkup0(&proc0, &thread0); 313 thread0.td_frame = &frame0; 314 315 /* 316 * Set up per-cpu data. 317 */ 318 pc = __pcpu; 319 pcpu_init(pc, 0, sizeof(struct pcpu)); 320 pc->pc_curthread = &thread0; 321 #ifdef __powerpc64__ 322 __asm __volatile("mr 13,%0" :: "r"(pc->pc_curthread)); 323 #else 324 __asm __volatile("mr 2,%0" :: "r"(pc->pc_curthread)); 325 #endif 326 pc->pc_cpuid = 0; 327 328 __asm __volatile("mtsprg 0, %0" :: "r"(pc)); 329 330 /* 331 * Init mutexes, which we use heavily in PMAP 332 */ 333 334 mutex_init(); 335 336 /* 337 * Install the OF client interface 338 */ 339 340 OF_bootstrap(); 341 342 if (ofw_bootargs) 343 ofw_parse_bootargs(); 344 345 /* 346 * Initialize the console before printing anything. 347 */ 348 cninit(); 349 350 /* 351 * Complain if there is no metadata. 352 */ 353 if (mdp == NULL || kmdp == NULL) { 354 printf("powerpc_init: no loader metadata.\n"); 355 } 356 357 /* 358 * Init KDB 359 */ 360 361 kdb_init(); 362 363 #ifdef AIM 364 aim_cpu_init(toc); 365 #else /* BOOKE */ 366 booke_cpu_init(); 367 368 /* Make sure the kernel icache is valid before we go too much further */ 369 __syncicache((caddr_t)startkernel, endkernel - startkernel); 370 #endif 371 372 /* 373 * Choose a platform module so we can get the physical memory map. 374 */ 375 376 platform_probe_and_attach(); 377 378 /* 379 * Bring up MMU 380 */ 381 pmap_bootstrap(startkernel, endkernel); 382 mtmsr(PSL_KERNSET & ~PSL_EE); 383 384 /* 385 * Initialize params/tunables that are derived from memsize 386 */ 387 init_param2(physmem); 388 389 /* 390 * Grab booted kernel's name 391 */ 392 env = kern_getenv("kernelname"); 393 if (env != NULL) { 394 strlcpy(kernelname, env, sizeof(kernelname)); 395 freeenv(env); 396 } 397 398 /* 399 * Finish setting up thread0. 400 */ 401 thread0.td_pcb = (struct pcb *) 402 ((thread0.td_kstack + thread0.td_kstack_pages * PAGE_SIZE - 403 sizeof(struct pcb)) & ~15UL); 404 bzero((void *)thread0.td_pcb, sizeof(struct pcb)); 405 pc->pc_curpcb = thread0.td_pcb; 406 407 /* Initialise the message buffer. */ 408 msgbufinit(msgbufp, msgbufsize); 409 410 #ifdef KDB 411 if (boothowto & RB_KDB) 412 kdb_enter(KDB_WHY_BOOTFLAGS, 413 "Boot flags requested debugger"); 414 #endif 415 416 return (((uintptr_t)thread0.td_pcb - 417 (sizeof(struct callframe) - 3*sizeof(register_t))) & ~15UL); 418 } 419 420 void 421 bzero(void *buf, size_t len) 422 { 423 caddr_t p; 424 425 p = buf; 426 427 while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) { 428 *p++ = 0; 429 len--; 430 } 431 432 while (len >= sizeof(u_long) * 8) { 433 *(u_long*) p = 0; 434 *((u_long*) p + 1) = 0; 435 *((u_long*) p + 2) = 0; 436 *((u_long*) p + 3) = 0; 437 len -= sizeof(u_long) * 8; 438 *((u_long*) p + 4) = 0; 439 *((u_long*) p + 5) = 0; 440 *((u_long*) p + 6) = 0; 441 *((u_long*) p + 7) = 0; 442 p += sizeof(u_long) * 8; 443 } 444 445 while (len >= sizeof(u_long)) { 446 *(u_long*) p = 0; 447 len -= sizeof(u_long); 448 p += sizeof(u_long); 449 } 450 451 while (len) { 452 *p++ = 0; 453 len--; 454 } 455 } 456 457 /* 458 * Flush the D-cache for non-DMA I/O so that the I-cache can 459 * be made coherent later. 460 */ 461 void 462 cpu_flush_dcache(void *ptr, size_t len) 463 { 464 register_t addr, off; 465 466 /* 467 * Align the address to a cacheline and adjust the length 468 * accordingly. Then round the length to a multiple of the 469 * cacheline for easy looping. 470 */ 471 addr = (uintptr_t)ptr; 472 off = addr & (cacheline_size - 1); 473 addr -= off; 474 len = roundup2(len + off, cacheline_size); 475 476 while (len > 0) { 477 __asm __volatile ("dcbf 0,%0" :: "r"(addr)); 478 __asm __volatile ("sync"); 479 addr += cacheline_size; 480 len -= cacheline_size; 481 } 482 } 483 484 int 485 ptrace_set_pc(struct thread *td, unsigned long addr) 486 { 487 struct trapframe *tf; 488 489 tf = td->td_frame; 490 tf->srr0 = (register_t)addr; 491 492 return (0); 493 } 494 495 void 496 spinlock_enter(void) 497 { 498 struct thread *td; 499 register_t msr; 500 501 td = curthread; 502 if (td->td_md.md_spinlock_count == 0) { 503 __asm __volatile("or 2,2,2"); /* Set high thread priority */ 504 msr = intr_disable(); 505 td->td_md.md_spinlock_count = 1; 506 td->td_md.md_saved_msr = msr; 507 } else 508 td->td_md.md_spinlock_count++; 509 critical_enter(); 510 } 511 512 void 513 spinlock_exit(void) 514 { 515 struct thread *td; 516 register_t msr; 517 518 td = curthread; 519 critical_exit(); 520 msr = td->td_md.md_saved_msr; 521 td->td_md.md_spinlock_count--; 522 if (td->td_md.md_spinlock_count == 0) { 523 intr_restore(msr); 524 __asm __volatile("or 6,6,6"); /* Set normal thread priority */ 525 } 526 } 527 528 /* 529 * Simple ddb(4) command/hack to view any SPR on the running CPU. 530 * Uses a trivial asm function to perform the mfspr, and rewrites the mfspr 531 * instruction each time. 532 * XXX: Since it uses code modification, it won't work if the kernel code pages 533 * are marked RO. 534 */ 535 extern register_t get_spr(int); 536 537 #ifdef DDB 538 DB_SHOW_COMMAND(spr, db_show_spr) 539 { 540 register_t spr; 541 volatile uint32_t *p; 542 int sprno, saved_sprno; 543 544 if (!have_addr) 545 return; 546 547 saved_sprno = sprno = (intptr_t) addr; 548 sprno = ((sprno & 0x3e0) >> 5) | ((sprno & 0x1f) << 5); 549 p = (uint32_t *)(void *)&get_spr; 550 *p = (*p & ~0x001ff800) | (sprno << 11); 551 __syncicache(get_spr, cacheline_size); 552 spr = get_spr(sprno); 553 554 db_printf("SPR %d(%x): %lx\n", saved_sprno, saved_sprno, 555 (unsigned long)spr); 556 } 557 #endif 558