1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999, 2012 5 * Author(s): Hartmut Penner (hp@de.ibm.com), 6 * Martin Schwidefsky (schwidefsky@de.ibm.com) 7 * 8 * Derived from "arch/i386/kernel/setup.c" 9 * Copyright (C) 1995, Linus Torvalds 10 */ 11 12 /* 13 * This file handles the architecture-dependent parts of initialization 14 */ 15 16 #define KMSG_COMPONENT "setup" 17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 18 19 #include <linux/errno.h> 20 #include <linux/export.h> 21 #include <linux/sched.h> 22 #include <linux/sched/task.h> 23 #include <linux/cpu.h> 24 #include <linux/kernel.h> 25 #include <linux/memblock.h> 26 #include <linux/mm.h> 27 #include <linux/stddef.h> 28 #include <linux/unistd.h> 29 #include <linux/ptrace.h> 30 #include <linux/random.h> 31 #include <linux/user.h> 32 #include <linux/tty.h> 33 #include <linux/ioport.h> 34 #include <linux/delay.h> 35 #include <linux/init.h> 36 #include <linux/initrd.h> 37 #include <linux/root_dev.h> 38 #include <linux/console.h> 39 #include <linux/kernel_stat.h> 40 #include <linux/dma-contiguous.h> 41 #include <linux/device.h> 42 #include <linux/notifier.h> 43 #include <linux/pfn.h> 44 #include <linux/ctype.h> 45 #include <linux/reboot.h> 46 #include <linux/topology.h> 47 #include <linux/kexec.h> 48 #include <linux/crash_dump.h> 49 #include <linux/memory.h> 50 #include <linux/compat.h> 51 #include <linux/start_kernel.h> 52 53 #include <asm/boot_data.h> 54 #include <asm/ipl.h> 55 #include <asm/facility.h> 56 #include <asm/smp.h> 57 #include <asm/mmu_context.h> 58 #include <asm/cpcmd.h> 59 #include <asm/lowcore.h> 60 #include <asm/nmi.h> 61 #include <asm/irq.h> 62 #include <asm/page.h> 63 #include <asm/ptrace.h> 64 #include <asm/sections.h> 65 #include <asm/ebcdic.h> 66 #include <asm/diag.h> 67 #include <asm/os_info.h> 68 #include <asm/sclp.h> 69 #include <asm/stacktrace.h> 70 #include <asm/sysinfo.h> 71 #include <asm/numa.h> 72 #include <asm/alternative.h> 73 #include <asm/nospec-branch.h> 74 #include <asm/mem_detect.h> 75 #include <asm/uv.h> 76 #include "entry.h" 77 78 /* 79 * Machine setup.. 80 */ 81 unsigned int console_mode = 0; 82 EXPORT_SYMBOL(console_mode); 83 84 unsigned int console_devno = -1; 85 EXPORT_SYMBOL(console_devno); 86 87 unsigned int console_irq = -1; 88 EXPORT_SYMBOL(console_irq); 89 90 unsigned long elf_hwcap __read_mostly = 0; 91 char elf_platform[ELF_PLATFORM_SIZE]; 92 93 unsigned long int_hwcap = 0; 94 95 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST 96 int __bootdata_preserved(prot_virt_guest); 97 #endif 98 99 int __bootdata(noexec_disabled); 100 int __bootdata(memory_end_set); 101 unsigned long __bootdata(memory_end); 102 unsigned long __bootdata(max_physmem_end); 103 struct mem_detect_info __bootdata(mem_detect); 104 105 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table); 106 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table); 107 unsigned long __bootdata_preserved(__swsusp_reset_dma); 108 unsigned long __bootdata_preserved(__stext_dma); 109 unsigned long __bootdata_preserved(__etext_dma); 110 unsigned long __bootdata_preserved(__sdma); 111 unsigned long __bootdata_preserved(__edma); 112 unsigned long __bootdata_preserved(__kaslr_offset); 113 114 unsigned long VMALLOC_START; 115 EXPORT_SYMBOL(VMALLOC_START); 116 117 unsigned long VMALLOC_END; 118 EXPORT_SYMBOL(VMALLOC_END); 119 120 struct page *vmemmap; 121 EXPORT_SYMBOL(vmemmap); 122 123 unsigned long MODULES_VADDR; 124 unsigned long MODULES_END; 125 126 /* An array with a pointer to the lowcore of every CPU. */ 127 struct lowcore *lowcore_ptr[NR_CPUS]; 128 EXPORT_SYMBOL(lowcore_ptr); 129 130 /* 131 * This is set up by the setup-routine at boot-time 132 * for S390 need to find out, what we have to setup 133 * using address 0x10400 ... 134 */ 135 136 #include <asm/setup.h> 137 138 /* 139 * condev= and conmode= setup parameter. 140 */ 141 142 static int __init condev_setup(char *str) 143 { 144 int vdev; 145 146 vdev = simple_strtoul(str, &str, 0); 147 if (vdev >= 0 && vdev < 65536) { 148 console_devno = vdev; 149 console_irq = -1; 150 } 151 return 1; 152 } 153 154 __setup("condev=", condev_setup); 155 156 static void __init set_preferred_console(void) 157 { 158 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 159 add_preferred_console("ttyS", 0, NULL); 160 else if (CONSOLE_IS_3270) 161 add_preferred_console("tty3270", 0, NULL); 162 else if (CONSOLE_IS_VT220) 163 add_preferred_console("ttyS", 1, NULL); 164 else if (CONSOLE_IS_HVC) 165 add_preferred_console("hvc", 0, NULL); 166 } 167 168 static int __init conmode_setup(char *str) 169 { 170 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 171 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 172 SET_CONSOLE_SCLP; 173 #endif 174 #if defined(CONFIG_TN3215_CONSOLE) 175 if (strncmp(str, "3215", 5) == 0) 176 SET_CONSOLE_3215; 177 #endif 178 #if defined(CONFIG_TN3270_CONSOLE) 179 if (strncmp(str, "3270", 5) == 0) 180 SET_CONSOLE_3270; 181 #endif 182 set_preferred_console(); 183 return 1; 184 } 185 186 __setup("conmode=", conmode_setup); 187 188 static void __init conmode_default(void) 189 { 190 char query_buffer[1024]; 191 char *ptr; 192 193 if (MACHINE_IS_VM) { 194 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 196 ptr = strstr(query_buffer, "SUBCHANNEL ="); 197 console_irq = simple_strtoul(ptr + 13, NULL, 16); 198 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 199 ptr = strstr(query_buffer, "CONMODE"); 200 /* 201 * Set the conmode to 3215 so that the device recognition 202 * will set the cu_type of the console to 3215. If the 203 * conmode is 3270 and we don't set it back then both 204 * 3215 and the 3270 driver will try to access the console 205 * device (3215 as console and 3270 as normal tty). 206 */ 207 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 208 if (ptr == NULL) { 209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 210 SET_CONSOLE_SCLP; 211 #endif 212 return; 213 } 214 if (strncmp(ptr + 8, "3270", 4) == 0) { 215 #if defined(CONFIG_TN3270_CONSOLE) 216 SET_CONSOLE_3270; 217 #elif defined(CONFIG_TN3215_CONSOLE) 218 SET_CONSOLE_3215; 219 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 220 SET_CONSOLE_SCLP; 221 #endif 222 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 223 #if defined(CONFIG_TN3215_CONSOLE) 224 SET_CONSOLE_3215; 225 #elif defined(CONFIG_TN3270_CONSOLE) 226 SET_CONSOLE_3270; 227 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 228 SET_CONSOLE_SCLP; 229 #endif 230 } 231 } else if (MACHINE_IS_KVM) { 232 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 233 SET_CONSOLE_VT220; 234 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 235 SET_CONSOLE_SCLP; 236 else 237 SET_CONSOLE_HVC; 238 } else { 239 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 240 SET_CONSOLE_SCLP; 241 #endif 242 } 243 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE)) 244 conswitchp = &dummy_con; 245 } 246 247 #ifdef CONFIG_CRASH_DUMP 248 static void __init setup_zfcpdump(void) 249 { 250 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 251 return; 252 if (OLDMEM_BASE) 253 return; 254 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 255 console_loglevel = 2; 256 } 257 #else 258 static inline void setup_zfcpdump(void) {} 259 #endif /* CONFIG_CRASH_DUMP */ 260 261 /* 262 * Reboot, halt and power_off stubs. They just call _machine_restart, 263 * _machine_halt or _machine_power_off. 264 */ 265 266 void machine_restart(char *command) 267 { 268 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 269 /* 270 * Only unblank the console if we are called in enabled 271 * context or a bust_spinlocks cleared the way for us. 272 */ 273 console_unblank(); 274 _machine_restart(command); 275 } 276 277 void machine_halt(void) 278 { 279 if (!in_interrupt() || oops_in_progress) 280 /* 281 * Only unblank the console if we are called in enabled 282 * context or a bust_spinlocks cleared the way for us. 283 */ 284 console_unblank(); 285 _machine_halt(); 286 } 287 288 void machine_power_off(void) 289 { 290 if (!in_interrupt() || oops_in_progress) 291 /* 292 * Only unblank the console if we are called in enabled 293 * context or a bust_spinlocks cleared the way for us. 294 */ 295 console_unblank(); 296 _machine_power_off(); 297 } 298 299 /* 300 * Dummy power off function. 301 */ 302 void (*pm_power_off)(void) = machine_power_off; 303 EXPORT_SYMBOL_GPL(pm_power_off); 304 305 static int __init parse_vmalloc(char *arg) 306 { 307 if (!arg) 308 return -EINVAL; 309 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 310 return 0; 311 } 312 early_param("vmalloc", parse_vmalloc); 313 314 void *restart_stack __section(.data); 315 316 unsigned long stack_alloc(void) 317 { 318 #ifdef CONFIG_VMAP_STACK 319 return (unsigned long) 320 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE, 321 VMALLOC_START, VMALLOC_END, 322 THREADINFO_GFP, 323 PAGE_KERNEL, 0, NUMA_NO_NODE, 324 __builtin_return_address(0)); 325 #else 326 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 327 #endif 328 } 329 330 void stack_free(unsigned long stack) 331 { 332 #ifdef CONFIG_VMAP_STACK 333 vfree((void *) stack); 334 #else 335 free_pages(stack, THREAD_SIZE_ORDER); 336 #endif 337 } 338 339 int __init arch_early_irq_init(void) 340 { 341 unsigned long stack; 342 343 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 344 if (!stack) 345 panic("Couldn't allocate async stack"); 346 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 347 return 0; 348 } 349 350 static int __init async_stack_realloc(void) 351 { 352 unsigned long old, new; 353 354 old = S390_lowcore.async_stack - STACK_INIT_OFFSET; 355 new = stack_alloc(); 356 if (!new) 357 panic("Couldn't allocate async stack"); 358 S390_lowcore.async_stack = new + STACK_INIT_OFFSET; 359 free_pages(old, THREAD_SIZE_ORDER); 360 return 0; 361 } 362 early_initcall(async_stack_realloc); 363 364 void __init arch_call_rest_init(void) 365 { 366 struct stack_frame *frame; 367 unsigned long stack; 368 369 stack = stack_alloc(); 370 if (!stack) 371 panic("Couldn't allocate kernel stack"); 372 current->stack = (void *) stack; 373 #ifdef CONFIG_VMAP_STACK 374 current->stack_vm_area = (void *) stack; 375 #endif 376 set_task_stack_end_magic(current); 377 stack += STACK_INIT_OFFSET; 378 S390_lowcore.kernel_stack = stack; 379 frame = (struct stack_frame *) stack; 380 memset(frame, 0, sizeof(*frame)); 381 /* Branch to rest_init on the new stack, never returns */ 382 asm volatile( 383 " la 15,0(%[_frame])\n" 384 " jg rest_init\n" 385 : : [_frame] "a" (frame)); 386 } 387 388 static void __init setup_lowcore_dat_off(void) 389 { 390 struct lowcore *lc; 391 392 /* 393 * Setup lowcore for boot cpu 394 */ 395 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 396 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 397 if (!lc) 398 panic("%s: Failed to allocate %zu bytes align=%zx\n", 399 __func__, sizeof(*lc), sizeof(*lc)); 400 401 lc->restart_psw.mask = PSW_KERNEL_BITS; 402 lc->restart_psw.addr = (unsigned long) restart_int_handler; 403 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 404 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 405 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 406 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 407 lc->svc_new_psw.addr = (unsigned long) system_call; 408 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 409 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 410 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 411 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 412 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 413 lc->io_new_psw.addr = (unsigned long) io_int_handler; 414 lc->clock_comparator = clock_comparator_max; 415 lc->nodat_stack = ((unsigned long) &init_thread_union) 416 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 417 lc->current_task = (unsigned long)&init_task; 418 lc->lpp = LPP_MAGIC; 419 lc->machine_flags = S390_lowcore.machine_flags; 420 lc->preempt_count = S390_lowcore.preempt_count; 421 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 422 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 423 sizeof(lc->stfle_fac_list)); 424 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, 425 sizeof(lc->alt_stfle_fac_list)); 426 nmi_alloc_boot_cpu(lc); 427 vdso_alloc_boot_cpu(lc); 428 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 429 lc->async_enter_timer = S390_lowcore.async_enter_timer; 430 lc->exit_timer = S390_lowcore.exit_timer; 431 lc->user_timer = S390_lowcore.user_timer; 432 lc->system_timer = S390_lowcore.system_timer; 433 lc->steal_timer = S390_lowcore.steal_timer; 434 lc->last_update_timer = S390_lowcore.last_update_timer; 435 lc->last_update_clock = S390_lowcore.last_update_clock; 436 437 /* 438 * Allocate the global restart stack which is the same for 439 * all CPUs in cast *one* of them does a PSW restart. 440 */ 441 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 442 if (!restart_stack) 443 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 444 __func__, THREAD_SIZE, THREAD_SIZE); 445 restart_stack += STACK_INIT_OFFSET; 446 447 /* 448 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 449 * restart data to the absolute zero lowcore. This is necessary if 450 * PSW restart is done on an offline CPU that has lowcore zero. 451 */ 452 lc->restart_stack = (unsigned long) restart_stack; 453 lc->restart_fn = (unsigned long) do_restart; 454 lc->restart_data = 0; 455 lc->restart_source = -1UL; 456 457 /* Setup absolute zero lowcore */ 458 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 459 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 460 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 461 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 462 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 463 464 #ifdef CONFIG_SMP 465 lc->spinlock_lockval = arch_spin_lockval(0); 466 lc->spinlock_index = 0; 467 arch_spin_lock_setup(0); 468 #endif 469 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 470 471 set_prefix((u32)(unsigned long) lc); 472 lowcore_ptr[0] = lc; 473 } 474 475 static void __init setup_lowcore_dat_on(void) 476 { 477 __ctl_clear_bit(0, 28); 478 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 479 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 480 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 481 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 482 __ctl_set_bit(0, 28); 483 } 484 485 static struct resource code_resource = { 486 .name = "Kernel code", 487 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 488 }; 489 490 static struct resource data_resource = { 491 .name = "Kernel data", 492 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 493 }; 494 495 static struct resource bss_resource = { 496 .name = "Kernel bss", 497 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 498 }; 499 500 static struct resource __initdata *standard_resources[] = { 501 &code_resource, 502 &data_resource, 503 &bss_resource, 504 }; 505 506 static void __init setup_resources(void) 507 { 508 struct resource *res, *std_res, *sub_res; 509 struct memblock_region *reg; 510 int j; 511 512 code_resource.start = (unsigned long) _text; 513 code_resource.end = (unsigned long) _etext - 1; 514 data_resource.start = (unsigned long) _etext; 515 data_resource.end = (unsigned long) _edata - 1; 516 bss_resource.start = (unsigned long) __bss_start; 517 bss_resource.end = (unsigned long) __bss_stop - 1; 518 519 for_each_memblock(memory, reg) { 520 res = memblock_alloc(sizeof(*res), 8); 521 if (!res) 522 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 523 __func__, sizeof(*res), 8); 524 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 525 526 res->name = "System RAM"; 527 res->start = reg->base; 528 res->end = reg->base + reg->size - 1; 529 request_resource(&iomem_resource, res); 530 531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 532 std_res = standard_resources[j]; 533 if (std_res->start < res->start || 534 std_res->start > res->end) 535 continue; 536 if (std_res->end > res->end) { 537 sub_res = memblock_alloc(sizeof(*sub_res), 8); 538 if (!sub_res) 539 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 540 __func__, sizeof(*sub_res), 8); 541 *sub_res = *std_res; 542 sub_res->end = res->end; 543 std_res->start = res->end + 1; 544 request_resource(res, sub_res); 545 } else { 546 request_resource(res, std_res); 547 } 548 } 549 } 550 #ifdef CONFIG_CRASH_DUMP 551 /* 552 * Re-add removed crash kernel memory as reserved memory. This makes 553 * sure it will be mapped with the identity mapping and struct pages 554 * will be created, so it can be resized later on. 555 * However add it later since the crash kernel resource should not be 556 * part of the System RAM resource. 557 */ 558 if (crashk_res.end) { 559 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 560 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 561 insert_resource(&iomem_resource, &crashk_res); 562 } 563 #endif 564 } 565 566 static void __init setup_memory_end(void) 567 { 568 unsigned long vmax, vmalloc_size, tmp; 569 570 /* Choose kernel address space layout: 3 or 4 levels. */ 571 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 572 if (IS_ENABLED(CONFIG_KASAN)) { 573 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING) 574 ? _REGION1_SIZE 575 : _REGION2_SIZE; 576 } else { 577 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 578 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 579 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 580 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 581 else 582 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 583 } 584 585 /* module area is at the end of the kernel address space. */ 586 MODULES_END = vmax; 587 MODULES_VADDR = MODULES_END - MODULES_LEN; 588 VMALLOC_END = MODULES_VADDR; 589 VMALLOC_START = VMALLOC_END - vmalloc_size; 590 591 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 592 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 593 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 594 tmp = SECTION_ALIGN_UP(tmp); 595 tmp = VMALLOC_START - tmp * sizeof(struct page); 596 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 597 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 598 vmemmap = (struct page *) tmp; 599 600 /* Take care that memory_end is set and <= vmemmap */ 601 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap); 602 #ifdef CONFIG_KASAN 603 /* fit in kasan shadow memory region between 1:1 and vmemmap */ 604 memory_end = min(memory_end, KASAN_SHADOW_START); 605 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); 606 #endif 607 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 608 memblock_remove(memory_end, ULONG_MAX); 609 610 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 611 } 612 613 #ifdef CONFIG_CRASH_DUMP 614 615 /* 616 * When kdump is enabled, we have to ensure that no memory from 617 * the area [0 - crashkernel memory size] and 618 * [crashk_res.start - crashk_res.end] is set offline. 619 */ 620 static int kdump_mem_notifier(struct notifier_block *nb, 621 unsigned long action, void *data) 622 { 623 struct memory_notify *arg = data; 624 625 if (action != MEM_GOING_OFFLINE) 626 return NOTIFY_OK; 627 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 628 return NOTIFY_BAD; 629 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 630 return NOTIFY_OK; 631 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 632 return NOTIFY_OK; 633 return NOTIFY_BAD; 634 } 635 636 static struct notifier_block kdump_mem_nb = { 637 .notifier_call = kdump_mem_notifier, 638 }; 639 640 #endif 641 642 /* 643 * Make sure that the area behind memory_end is protected 644 */ 645 static void reserve_memory_end(void) 646 { 647 if (memory_end_set) 648 memblock_reserve(memory_end, ULONG_MAX); 649 } 650 651 /* 652 * Make sure that oldmem, where the dump is stored, is protected 653 */ 654 static void reserve_oldmem(void) 655 { 656 #ifdef CONFIG_CRASH_DUMP 657 if (OLDMEM_BASE) 658 /* Forget all memory above the running kdump system */ 659 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 660 #endif 661 } 662 663 /* 664 * Make sure that oldmem, where the dump is stored, is protected 665 */ 666 static void remove_oldmem(void) 667 { 668 #ifdef CONFIG_CRASH_DUMP 669 if (OLDMEM_BASE) 670 /* Forget all memory above the running kdump system */ 671 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 672 #endif 673 } 674 675 /* 676 * Reserve memory for kdump kernel to be loaded with kexec 677 */ 678 static void __init reserve_crashkernel(void) 679 { 680 #ifdef CONFIG_CRASH_DUMP 681 unsigned long long crash_base, crash_size; 682 phys_addr_t low, high; 683 int rc; 684 685 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 686 &crash_base); 687 688 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 689 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 690 if (rc || crash_size == 0) 691 return; 692 693 if (memblock.memory.regions[0].size < crash_size) { 694 pr_info("crashkernel reservation failed: %s\n", 695 "first memory chunk must be at least crashkernel size"); 696 return; 697 } 698 699 low = crash_base ?: OLDMEM_BASE; 700 high = low + crash_size; 701 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 702 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 703 crash_base = low; 704 } else { 705 /* Find suitable area in free memory */ 706 low = max_t(unsigned long, crash_size, sclp.hsa_size); 707 high = crash_base ? crash_base + crash_size : ULONG_MAX; 708 709 if (crash_base && crash_base < low) { 710 pr_info("crashkernel reservation failed: %s\n", 711 "crash_base too low"); 712 return; 713 } 714 low = crash_base ?: low; 715 crash_base = memblock_find_in_range(low, high, crash_size, 716 KEXEC_CRASH_MEM_ALIGN); 717 } 718 719 if (!crash_base) { 720 pr_info("crashkernel reservation failed: %s\n", 721 "no suitable area found"); 722 return; 723 } 724 725 if (register_memory_notifier(&kdump_mem_nb)) 726 return; 727 728 if (!OLDMEM_BASE && MACHINE_IS_VM) 729 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 730 crashk_res.start = crash_base; 731 crashk_res.end = crash_base + crash_size - 1; 732 memblock_remove(crash_base, crash_size); 733 pr_info("Reserving %lluMB of memory at %lluMB " 734 "for crashkernel (System RAM: %luMB)\n", 735 crash_size >> 20, crash_base >> 20, 736 (unsigned long)memblock.memory.total_size >> 20); 737 os_info_crashkernel_add(crash_base, crash_size); 738 #endif 739 } 740 741 /* 742 * Reserve the initrd from being used by memblock 743 */ 744 static void __init reserve_initrd(void) 745 { 746 #ifdef CONFIG_BLK_DEV_INITRD 747 if (!INITRD_START || !INITRD_SIZE) 748 return; 749 initrd_start = INITRD_START; 750 initrd_end = initrd_start + INITRD_SIZE; 751 memblock_reserve(INITRD_START, INITRD_SIZE); 752 #endif 753 } 754 755 /* 756 * Reserve the memory area used to pass the certificate lists 757 */ 758 static void __init reserve_certificate_list(void) 759 { 760 if (ipl_cert_list_addr) 761 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 762 } 763 764 static void __init reserve_mem_detect_info(void) 765 { 766 unsigned long start, size; 767 768 get_mem_detect_reserved(&start, &size); 769 if (size) 770 memblock_reserve(start, size); 771 } 772 773 static void __init free_mem_detect_info(void) 774 { 775 unsigned long start, size; 776 777 get_mem_detect_reserved(&start, &size); 778 if (size) 779 memblock_free(start, size); 780 } 781 782 static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size) 783 { 784 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n", 785 start, start + size - 1); 786 memblock_add_range(&memblock.memory, start, size, 0, 0); 787 memblock_add_range(&memblock.physmem, start, size, 0, 0); 788 } 789 790 static const char * __init get_mem_info_source(void) 791 { 792 switch (mem_detect.info_source) { 793 case MEM_DETECT_SCLP_STOR_INFO: 794 return "sclp storage info"; 795 case MEM_DETECT_DIAG260: 796 return "diag260"; 797 case MEM_DETECT_SCLP_READ_INFO: 798 return "sclp read info"; 799 case MEM_DETECT_BIN_SEARCH: 800 return "binary search"; 801 } 802 return "none"; 803 } 804 805 static void __init memblock_add_mem_detect_info(void) 806 { 807 unsigned long start, end; 808 int i; 809 810 memblock_dbg("physmem info source: %s (%hhd)\n", 811 get_mem_info_source(), mem_detect.info_source); 812 /* keep memblock lists close to the kernel */ 813 memblock_set_bottom_up(true); 814 for_each_mem_detect_block(i, &start, &end) 815 memblock_physmem_add(start, end - start); 816 memblock_set_bottom_up(false); 817 memblock_dump_all(); 818 } 819 820 /* 821 * Check for initrd being in usable memory 822 */ 823 static void __init check_initrd(void) 824 { 825 #ifdef CONFIG_BLK_DEV_INITRD 826 if (INITRD_START && INITRD_SIZE && 827 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 828 pr_err("The initial RAM disk does not fit into the memory\n"); 829 memblock_free(INITRD_START, INITRD_SIZE); 830 initrd_start = initrd_end = 0; 831 } 832 #endif 833 } 834 835 /* 836 * Reserve memory used for lowcore/command line/kernel image. 837 */ 838 static void __init reserve_kernel(void) 839 { 840 unsigned long start_pfn = PFN_UP(__pa(_end)); 841 842 memblock_reserve(0, HEAD_END); 843 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 844 - (unsigned long)_stext); 845 memblock_reserve(__sdma, __edma - __sdma); 846 } 847 848 static void __init setup_memory(void) 849 { 850 struct memblock_region *reg; 851 852 /* 853 * Init storage key for present memory 854 */ 855 for_each_memblock(memory, reg) { 856 storage_key_init_range(reg->base, reg->base + reg->size); 857 } 858 psw_set_key(PAGE_DEFAULT_KEY); 859 860 /* Only cosmetics */ 861 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 862 } 863 864 /* 865 * Setup hardware capabilities. 866 */ 867 static int __init setup_hwcaps(void) 868 { 869 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 870 struct cpuid cpu_id; 871 int i; 872 873 /* 874 * The store facility list bits numbers as found in the principles 875 * of operation are numbered with bit 1UL<<31 as number 0 to 876 * bit 1UL<<0 as number 31. 877 * Bit 0: instructions named N3, "backported" to esa-mode 878 * Bit 2: z/Architecture mode is active 879 * Bit 7: the store-facility-list-extended facility is installed 880 * Bit 17: the message-security assist is installed 881 * Bit 19: the long-displacement facility is installed 882 * Bit 21: the extended-immediate facility is installed 883 * Bit 22: extended-translation facility 3 is installed 884 * Bit 30: extended-translation facility 3 enhancement facility 885 * These get translated to: 886 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 887 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 888 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 889 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 890 */ 891 for (i = 0; i < 6; i++) 892 if (test_facility(stfl_bits[i])) 893 elf_hwcap |= 1UL << i; 894 895 if (test_facility(22) && test_facility(30)) 896 elf_hwcap |= HWCAP_S390_ETF3EH; 897 898 /* 899 * Check for additional facilities with store-facility-list-extended. 900 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 901 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 902 * as stored by stfl, bits 32-xxx contain additional facilities. 903 * How many facility words are stored depends on the number of 904 * doublewords passed to the instruction. The additional facilities 905 * are: 906 * Bit 42: decimal floating point facility is installed 907 * Bit 44: perform floating point operation facility is installed 908 * translated to: 909 * HWCAP_S390_DFP bit 6 (42 && 44). 910 */ 911 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 912 elf_hwcap |= HWCAP_S390_DFP; 913 914 /* 915 * Huge page support HWCAP_S390_HPAGE is bit 7. 916 */ 917 if (MACHINE_HAS_EDAT1) 918 elf_hwcap |= HWCAP_S390_HPAGE; 919 920 /* 921 * 64-bit register support for 31-bit processes 922 * HWCAP_S390_HIGH_GPRS is bit 9. 923 */ 924 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 925 926 /* 927 * Transactional execution support HWCAP_S390_TE is bit 10. 928 */ 929 if (MACHINE_HAS_TE) 930 elf_hwcap |= HWCAP_S390_TE; 931 932 /* 933 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 934 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 935 * instead of facility bit 129. 936 */ 937 if (MACHINE_HAS_VX) { 938 elf_hwcap |= HWCAP_S390_VXRS; 939 if (test_facility(134)) 940 elf_hwcap |= HWCAP_S390_VXRS_EXT; 941 if (test_facility(135)) 942 elf_hwcap |= HWCAP_S390_VXRS_BCD; 943 if (test_facility(148)) 944 elf_hwcap |= HWCAP_S390_VXRS_EXT2; 945 if (test_facility(152)) 946 elf_hwcap |= HWCAP_S390_VXRS_PDE; 947 } 948 if (test_facility(150)) 949 elf_hwcap |= HWCAP_S390_SORT; 950 if (test_facility(151)) 951 elf_hwcap |= HWCAP_S390_DFLT; 952 953 /* 954 * Guarded storage support HWCAP_S390_GS is bit 12. 955 */ 956 if (MACHINE_HAS_GS) 957 elf_hwcap |= HWCAP_S390_GS; 958 959 get_cpu_id(&cpu_id); 960 add_device_randomness(&cpu_id, sizeof(cpu_id)); 961 switch (cpu_id.machine) { 962 case 0x2064: 963 case 0x2066: 964 default: /* Use "z900" as default for 64 bit kernels. */ 965 strcpy(elf_platform, "z900"); 966 break; 967 case 0x2084: 968 case 0x2086: 969 strcpy(elf_platform, "z990"); 970 break; 971 case 0x2094: 972 case 0x2096: 973 strcpy(elf_platform, "z9-109"); 974 break; 975 case 0x2097: 976 case 0x2098: 977 strcpy(elf_platform, "z10"); 978 break; 979 case 0x2817: 980 case 0x2818: 981 strcpy(elf_platform, "z196"); 982 break; 983 case 0x2827: 984 case 0x2828: 985 strcpy(elf_platform, "zEC12"); 986 break; 987 case 0x2964: 988 case 0x2965: 989 strcpy(elf_platform, "z13"); 990 break; 991 case 0x3906: 992 case 0x3907: 993 strcpy(elf_platform, "z14"); 994 break; 995 } 996 997 /* 998 * Virtualization support HWCAP_INT_SIE is bit 0. 999 */ 1000 if (sclp.has_sief2) 1001 int_hwcap |= HWCAP_INT_SIE; 1002 1003 return 0; 1004 } 1005 arch_initcall(setup_hwcaps); 1006 1007 /* 1008 * Add system information as device randomness 1009 */ 1010 static void __init setup_randomness(void) 1011 { 1012 struct sysinfo_3_2_2 *vmms; 1013 1014 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 1015 PAGE_SIZE); 1016 if (!vmms) 1017 panic("Failed to allocate memory for sysinfo structure\n"); 1018 1019 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 1020 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 1021 memblock_free((unsigned long) vmms, PAGE_SIZE); 1022 } 1023 1024 /* 1025 * Find the correct size for the task_struct. This depends on 1026 * the size of the struct fpu at the end of the thread_struct 1027 * which is embedded in the task_struct. 1028 */ 1029 static void __init setup_task_size(void) 1030 { 1031 int task_size = sizeof(struct task_struct); 1032 1033 if (!MACHINE_HAS_VX) { 1034 task_size -= sizeof(__vector128) * __NUM_VXRS; 1035 task_size += sizeof(freg_t) * __NUM_FPRS; 1036 } 1037 arch_task_struct_size = task_size; 1038 } 1039 1040 /* 1041 * Issue diagnose 318 to set the control program name and 1042 * version codes. 1043 */ 1044 static void __init setup_control_program_code(void) 1045 { 1046 union diag318_info diag318_info = { 1047 .cpnc = CPNC_LINUX, 1048 .cpvc_linux = 0, 1049 .cpvc_distro = {0}, 1050 }; 1051 1052 if (!sclp.has_diag318) 1053 return; 1054 1055 diag_stat_inc(DIAG_STAT_X318); 1056 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 1057 } 1058 1059 /* 1060 * Print the component list from the IPL report 1061 */ 1062 static void __init log_component_list(void) 1063 { 1064 struct ipl_rb_component_entry *ptr, *end; 1065 char *str; 1066 1067 if (!early_ipl_comp_list_addr) 1068 return; 1069 if (ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR) 1070 pr_info("Linux is running with Secure-IPL enabled\n"); 1071 else 1072 pr_info("Linux is running with Secure-IPL disabled\n"); 1073 ptr = (void *) early_ipl_comp_list_addr; 1074 end = (void *) ptr + early_ipl_comp_list_size; 1075 pr_info("The IPL report contains the following components:\n"); 1076 while (ptr < end) { 1077 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 1078 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 1079 str = "signed, verified"; 1080 else 1081 str = "signed, verification failed"; 1082 } else { 1083 str = "not signed"; 1084 } 1085 pr_info("%016llx - %016llx (%s)\n", 1086 ptr->addr, ptr->addr + ptr->len, str); 1087 ptr++; 1088 } 1089 } 1090 1091 /* 1092 * Setup function called from init/main.c just after the banner 1093 * was printed. 1094 */ 1095 1096 void __init setup_arch(char **cmdline_p) 1097 { 1098 /* 1099 * print what head.S has found out about the machine 1100 */ 1101 if (MACHINE_IS_VM) 1102 pr_info("Linux is running as a z/VM " 1103 "guest operating system in 64-bit mode\n"); 1104 else if (MACHINE_IS_KVM) 1105 pr_info("Linux is running under KVM in 64-bit mode\n"); 1106 else if (MACHINE_IS_LPAR) 1107 pr_info("Linux is running natively in 64-bit mode\n"); 1108 else 1109 pr_info("Linux is running as a guest in 64-bit mode\n"); 1110 1111 log_component_list(); 1112 1113 /* Have one command line that is parsed and saved in /proc/cmdline */ 1114 /* boot_command_line has been already set up in early.c */ 1115 *cmdline_p = boot_command_line; 1116 1117 ROOT_DEV = Root_RAM0; 1118 1119 /* Is init_mm really needed? */ 1120 init_mm.start_code = PAGE_OFFSET; 1121 init_mm.end_code = (unsigned long) _etext; 1122 init_mm.end_data = (unsigned long) _edata; 1123 init_mm.brk = (unsigned long) _end; 1124 1125 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1126 nospec_auto_detect(); 1127 1128 parse_early_param(); 1129 #ifdef CONFIG_CRASH_DUMP 1130 /* Deactivate elfcorehdr= kernel parameter */ 1131 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1132 #endif 1133 1134 os_info_init(); 1135 setup_ipl(); 1136 setup_task_size(); 1137 setup_control_program_code(); 1138 1139 /* Do some memory reservations *before* memory is added to memblock */ 1140 reserve_memory_end(); 1141 reserve_oldmem(); 1142 reserve_kernel(); 1143 reserve_initrd(); 1144 reserve_certificate_list(); 1145 reserve_mem_detect_info(); 1146 memblock_allow_resize(); 1147 1148 /* Get information about *all* installed memory */ 1149 memblock_add_mem_detect_info(); 1150 1151 free_mem_detect_info(); 1152 remove_oldmem(); 1153 1154 /* 1155 * Make sure all chunks are MAX_ORDER aligned so we don't need the 1156 * extra checks that HOLES_IN_ZONE would require. 1157 * 1158 * Is this still required? 1159 */ 1160 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 1161 1162 setup_memory_end(); 1163 setup_memory(); 1164 dma_contiguous_reserve(memory_end); 1165 vmcp_cma_reserve(); 1166 1167 check_initrd(); 1168 reserve_crashkernel(); 1169 #ifdef CONFIG_CRASH_DUMP 1170 /* 1171 * Be aware that smp_save_dump_cpus() triggers a system reset. 1172 * Therefore CPU and device initialization should be done afterwards. 1173 */ 1174 smp_save_dump_cpus(); 1175 #endif 1176 1177 setup_resources(); 1178 setup_lowcore_dat_off(); 1179 smp_fill_possible_mask(); 1180 cpu_detect_mhz_feature(); 1181 cpu_init(); 1182 numa_setup(); 1183 smp_detect_cpus(); 1184 topology_init_early(); 1185 1186 /* 1187 * Create kernel page tables and switch to virtual addressing. 1188 */ 1189 paging_init(); 1190 1191 /* 1192 * After paging_init created the kernel page table, the new PSWs 1193 * in lowcore can now run with DAT enabled. 1194 */ 1195 setup_lowcore_dat_on(); 1196 1197 /* Setup default console */ 1198 conmode_default(); 1199 set_preferred_console(); 1200 1201 apply_alternative_instructions(); 1202 if (IS_ENABLED(CONFIG_EXPOLINE)) 1203 nospec_init_branches(); 1204 1205 /* Setup zfcpdump support */ 1206 setup_zfcpdump(); 1207 1208 /* Add system specific data to the random pool */ 1209 setup_randomness(); 1210 } 1211