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/bootmem.h> 38 #include <linux/root_dev.h> 39 #include <linux/console.h> 40 #include <linux/kernel_stat.h> 41 #include <linux/dma-contiguous.h> 42 #include <linux/device.h> 43 #include <linux/notifier.h> 44 #include <linux/pfn.h> 45 #include <linux/ctype.h> 46 #include <linux/reboot.h> 47 #include <linux/topology.h> 48 #include <linux/kexec.h> 49 #include <linux/crash_dump.h> 50 #include <linux/memory.h> 51 #include <linux/compat.h> 52 53 #include <asm/ipl.h> 54 #include <asm/facility.h> 55 #include <asm/smp.h> 56 #include <asm/mmu_context.h> 57 #include <asm/cpcmd.h> 58 #include <asm/lowcore.h> 59 #include <asm/nmi.h> 60 #include <asm/irq.h> 61 #include <asm/page.h> 62 #include <asm/ptrace.h> 63 #include <asm/sections.h> 64 #include <asm/ebcdic.h> 65 #include <asm/diag.h> 66 #include <asm/os_info.h> 67 #include <asm/sclp.h> 68 #include <asm/sysinfo.h> 69 #include <asm/numa.h> 70 #include <asm/alternative.h> 71 #include <asm/nospec-branch.h> 72 #include "entry.h" 73 74 /* 75 * Machine setup.. 76 */ 77 unsigned int console_mode = 0; 78 EXPORT_SYMBOL(console_mode); 79 80 unsigned int console_devno = -1; 81 EXPORT_SYMBOL(console_devno); 82 83 unsigned int console_irq = -1; 84 EXPORT_SYMBOL(console_irq); 85 86 unsigned long elf_hwcap __read_mostly = 0; 87 char elf_platform[ELF_PLATFORM_SIZE]; 88 89 unsigned long int_hwcap = 0; 90 91 int __initdata memory_end_set; 92 unsigned long __initdata memory_end; 93 unsigned long __initdata max_physmem_end; 94 95 unsigned long VMALLOC_START; 96 EXPORT_SYMBOL(VMALLOC_START); 97 98 unsigned long VMALLOC_END; 99 EXPORT_SYMBOL(VMALLOC_END); 100 101 struct page *vmemmap; 102 EXPORT_SYMBOL(vmemmap); 103 104 unsigned long MODULES_VADDR; 105 unsigned long MODULES_END; 106 107 /* An array with a pointer to the lowcore of every CPU. */ 108 struct lowcore *lowcore_ptr[NR_CPUS]; 109 EXPORT_SYMBOL(lowcore_ptr); 110 111 /* 112 * This is set up by the setup-routine at boot-time 113 * for S390 need to find out, what we have to setup 114 * using address 0x10400 ... 115 */ 116 117 #include <asm/setup.h> 118 119 /* 120 * condev= and conmode= setup parameter. 121 */ 122 123 static int __init condev_setup(char *str) 124 { 125 int vdev; 126 127 vdev = simple_strtoul(str, &str, 0); 128 if (vdev >= 0 && vdev < 65536) { 129 console_devno = vdev; 130 console_irq = -1; 131 } 132 return 1; 133 } 134 135 __setup("condev=", condev_setup); 136 137 static void __init set_preferred_console(void) 138 { 139 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 140 add_preferred_console("ttyS", 0, NULL); 141 else if (CONSOLE_IS_3270) 142 add_preferred_console("tty3270", 0, NULL); 143 else if (CONSOLE_IS_VT220) 144 add_preferred_console("ttyS", 1, NULL); 145 else if (CONSOLE_IS_HVC) 146 add_preferred_console("hvc", 0, NULL); 147 } 148 149 static int __init conmode_setup(char *str) 150 { 151 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 152 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 153 SET_CONSOLE_SCLP; 154 #endif 155 #if defined(CONFIG_TN3215_CONSOLE) 156 if (strncmp(str, "3215", 5) == 0) 157 SET_CONSOLE_3215; 158 #endif 159 #if defined(CONFIG_TN3270_CONSOLE) 160 if (strncmp(str, "3270", 5) == 0) 161 SET_CONSOLE_3270; 162 #endif 163 set_preferred_console(); 164 return 1; 165 } 166 167 __setup("conmode=", conmode_setup); 168 169 static void __init conmode_default(void) 170 { 171 char query_buffer[1024]; 172 char *ptr; 173 174 if (MACHINE_IS_VM) { 175 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 176 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 177 ptr = strstr(query_buffer, "SUBCHANNEL ="); 178 console_irq = simple_strtoul(ptr + 13, NULL, 16); 179 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 180 ptr = strstr(query_buffer, "CONMODE"); 181 /* 182 * Set the conmode to 3215 so that the device recognition 183 * will set the cu_type of the console to 3215. If the 184 * conmode is 3270 and we don't set it back then both 185 * 3215 and the 3270 driver will try to access the console 186 * device (3215 as console and 3270 as normal tty). 187 */ 188 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 189 if (ptr == NULL) { 190 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 191 SET_CONSOLE_SCLP; 192 #endif 193 return; 194 } 195 if (strncmp(ptr + 8, "3270", 4) == 0) { 196 #if defined(CONFIG_TN3270_CONSOLE) 197 SET_CONSOLE_3270; 198 #elif defined(CONFIG_TN3215_CONSOLE) 199 SET_CONSOLE_3215; 200 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 201 SET_CONSOLE_SCLP; 202 #endif 203 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 204 #if defined(CONFIG_TN3215_CONSOLE) 205 SET_CONSOLE_3215; 206 #elif defined(CONFIG_TN3270_CONSOLE) 207 SET_CONSOLE_3270; 208 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 209 SET_CONSOLE_SCLP; 210 #endif 211 } 212 } else if (MACHINE_IS_KVM) { 213 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 214 SET_CONSOLE_VT220; 215 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 216 SET_CONSOLE_SCLP; 217 else 218 SET_CONSOLE_HVC; 219 } else { 220 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 221 SET_CONSOLE_SCLP; 222 #endif 223 } 224 } 225 226 #ifdef CONFIG_CRASH_DUMP 227 static void __init setup_zfcpdump(void) 228 { 229 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 230 return; 231 if (OLDMEM_BASE) 232 return; 233 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 234 console_loglevel = 2; 235 } 236 #else 237 static inline void setup_zfcpdump(void) {} 238 #endif /* CONFIG_CRASH_DUMP */ 239 240 /* 241 * Reboot, halt and power_off stubs. They just call _machine_restart, 242 * _machine_halt or _machine_power_off. 243 */ 244 245 void machine_restart(char *command) 246 { 247 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 248 /* 249 * Only unblank the console if we are called in enabled 250 * context or a bust_spinlocks cleared the way for us. 251 */ 252 console_unblank(); 253 _machine_restart(command); 254 } 255 256 void machine_halt(void) 257 { 258 if (!in_interrupt() || oops_in_progress) 259 /* 260 * Only unblank the console if we are called in enabled 261 * context or a bust_spinlocks cleared the way for us. 262 */ 263 console_unblank(); 264 _machine_halt(); 265 } 266 267 void machine_power_off(void) 268 { 269 if (!in_interrupt() || oops_in_progress) 270 /* 271 * Only unblank the console if we are called in enabled 272 * context or a bust_spinlocks cleared the way for us. 273 */ 274 console_unblank(); 275 _machine_power_off(); 276 } 277 278 /* 279 * Dummy power off function. 280 */ 281 void (*pm_power_off)(void) = machine_power_off; 282 EXPORT_SYMBOL_GPL(pm_power_off); 283 284 static int __init early_parse_mem(char *p) 285 { 286 memory_end = memparse(p, &p); 287 memory_end &= PAGE_MASK; 288 memory_end_set = 1; 289 return 0; 290 } 291 early_param("mem", early_parse_mem); 292 293 static int __init parse_vmalloc(char *arg) 294 { 295 if (!arg) 296 return -EINVAL; 297 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 298 return 0; 299 } 300 early_param("vmalloc", parse_vmalloc); 301 302 void *restart_stack __section(.data); 303 304 static void __init setup_lowcore(void) 305 { 306 struct lowcore *lc; 307 308 /* 309 * Setup lowcore for boot cpu 310 */ 311 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 312 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc)); 313 lc->restart_psw.mask = PSW_KERNEL_BITS; 314 lc->restart_psw.addr = (unsigned long) restart_int_handler; 315 lc->external_new_psw.mask = PSW_KERNEL_BITS | 316 PSW_MASK_DAT | PSW_MASK_MCHECK; 317 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 318 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 319 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 320 lc->svc_new_psw.addr = (unsigned long) system_call; 321 lc->program_new_psw.mask = PSW_KERNEL_BITS | 322 PSW_MASK_DAT | PSW_MASK_MCHECK; 323 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 324 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 325 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 326 lc->io_new_psw.mask = PSW_KERNEL_BITS | 327 PSW_MASK_DAT | PSW_MASK_MCHECK; 328 lc->io_new_psw.addr = (unsigned long) io_int_handler; 329 lc->clock_comparator = clock_comparator_max; 330 lc->kernel_stack = ((unsigned long) &init_thread_union) 331 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 332 lc->async_stack = (unsigned long) 333 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE) 334 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 335 lc->panic_stack = (unsigned long) 336 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE) 337 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 338 lc->current_task = (unsigned long)&init_task; 339 lc->lpp = LPP_MAGIC; 340 lc->machine_flags = S390_lowcore.machine_flags; 341 lc->preempt_count = S390_lowcore.preempt_count; 342 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 343 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 344 sizeof(lc->stfle_fac_list)); 345 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, 346 sizeof(lc->alt_stfle_fac_list)); 347 nmi_alloc_boot_cpu(lc); 348 vdso_alloc_boot_cpu(lc); 349 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 350 lc->async_enter_timer = S390_lowcore.async_enter_timer; 351 lc->exit_timer = S390_lowcore.exit_timer; 352 lc->user_timer = S390_lowcore.user_timer; 353 lc->system_timer = S390_lowcore.system_timer; 354 lc->steal_timer = S390_lowcore.steal_timer; 355 lc->last_update_timer = S390_lowcore.last_update_timer; 356 lc->last_update_clock = S390_lowcore.last_update_clock; 357 358 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE); 359 restart_stack += ASYNC_SIZE; 360 361 /* 362 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 363 * restart data to the absolute zero lowcore. This is necessary if 364 * PSW restart is done on an offline CPU that has lowcore zero. 365 */ 366 lc->restart_stack = (unsigned long) restart_stack; 367 lc->restart_fn = (unsigned long) do_restart; 368 lc->restart_data = 0; 369 lc->restart_source = -1UL; 370 371 /* Setup absolute zero lowcore */ 372 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 373 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 374 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 375 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 376 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 377 378 #ifdef CONFIG_SMP 379 lc->spinlock_lockval = arch_spin_lockval(0); 380 lc->spinlock_index = 0; 381 arch_spin_lock_setup(0); 382 #endif 383 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 384 385 set_prefix((u32)(unsigned long) lc); 386 lowcore_ptr[0] = lc; 387 } 388 389 static struct resource code_resource = { 390 .name = "Kernel code", 391 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 392 }; 393 394 static struct resource data_resource = { 395 .name = "Kernel data", 396 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 397 }; 398 399 static struct resource bss_resource = { 400 .name = "Kernel bss", 401 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 402 }; 403 404 static struct resource __initdata *standard_resources[] = { 405 &code_resource, 406 &data_resource, 407 &bss_resource, 408 }; 409 410 static void __init setup_resources(void) 411 { 412 struct resource *res, *std_res, *sub_res; 413 struct memblock_region *reg; 414 int j; 415 416 code_resource.start = (unsigned long) &_text; 417 code_resource.end = (unsigned long) &_etext - 1; 418 data_resource.start = (unsigned long) &_etext; 419 data_resource.end = (unsigned long) &_edata - 1; 420 bss_resource.start = (unsigned long) &__bss_start; 421 bss_resource.end = (unsigned long) &__bss_stop - 1; 422 423 for_each_memblock(memory, reg) { 424 res = memblock_virt_alloc(sizeof(*res), 8); 425 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 426 427 res->name = "System RAM"; 428 res->start = reg->base; 429 res->end = reg->base + reg->size - 1; 430 request_resource(&iomem_resource, res); 431 432 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 433 std_res = standard_resources[j]; 434 if (std_res->start < res->start || 435 std_res->start > res->end) 436 continue; 437 if (std_res->end > res->end) { 438 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8); 439 *sub_res = *std_res; 440 sub_res->end = res->end; 441 std_res->start = res->end + 1; 442 request_resource(res, sub_res); 443 } else { 444 request_resource(res, std_res); 445 } 446 } 447 } 448 #ifdef CONFIG_CRASH_DUMP 449 /* 450 * Re-add removed crash kernel memory as reserved memory. This makes 451 * sure it will be mapped with the identity mapping and struct pages 452 * will be created, so it can be resized later on. 453 * However add it later since the crash kernel resource should not be 454 * part of the System RAM resource. 455 */ 456 if (crashk_res.end) { 457 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 458 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 459 insert_resource(&iomem_resource, &crashk_res); 460 } 461 #endif 462 } 463 464 static void __init setup_memory_end(void) 465 { 466 unsigned long vmax, vmalloc_size, tmp; 467 468 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 469 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 470 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 471 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 472 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 473 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 474 else 475 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 476 /* module area is at the end of the kernel address space. */ 477 MODULES_END = vmax; 478 MODULES_VADDR = MODULES_END - MODULES_LEN; 479 VMALLOC_END = MODULES_VADDR; 480 VMALLOC_START = vmax - vmalloc_size; 481 482 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 483 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 484 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 485 tmp = SECTION_ALIGN_UP(tmp); 486 tmp = VMALLOC_START - tmp * sizeof(struct page); 487 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 488 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 489 vmemmap = (struct page *) tmp; 490 491 /* Take care that memory_end is set and <= vmemmap */ 492 memory_end = min(memory_end ?: max_physmem_end, tmp); 493 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 494 memblock_remove(memory_end, ULONG_MAX); 495 496 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 497 } 498 499 #ifdef CONFIG_CRASH_DUMP 500 501 /* 502 * When kdump is enabled, we have to ensure that no memory from 503 * the area [0 - crashkernel memory size] and 504 * [crashk_res.start - crashk_res.end] is set offline. 505 */ 506 static int kdump_mem_notifier(struct notifier_block *nb, 507 unsigned long action, void *data) 508 { 509 struct memory_notify *arg = data; 510 511 if (action != MEM_GOING_OFFLINE) 512 return NOTIFY_OK; 513 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 514 return NOTIFY_BAD; 515 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 516 return NOTIFY_OK; 517 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 518 return NOTIFY_OK; 519 return NOTIFY_BAD; 520 } 521 522 static struct notifier_block kdump_mem_nb = { 523 .notifier_call = kdump_mem_notifier, 524 }; 525 526 #endif 527 528 /* 529 * Make sure that the area behind memory_end is protected 530 */ 531 static void reserve_memory_end(void) 532 { 533 #ifdef CONFIG_CRASH_DUMP 534 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 535 !OLDMEM_BASE && sclp.hsa_size) { 536 memory_end = sclp.hsa_size; 537 memory_end &= PAGE_MASK; 538 memory_end_set = 1; 539 } 540 #endif 541 if (!memory_end_set) 542 return; 543 memblock_reserve(memory_end, ULONG_MAX); 544 } 545 546 /* 547 * Make sure that oldmem, where the dump is stored, is protected 548 */ 549 static void reserve_oldmem(void) 550 { 551 #ifdef CONFIG_CRASH_DUMP 552 if (OLDMEM_BASE) 553 /* Forget all memory above the running kdump system */ 554 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 555 #endif 556 } 557 558 /* 559 * Make sure that oldmem, where the dump is stored, is protected 560 */ 561 static void remove_oldmem(void) 562 { 563 #ifdef CONFIG_CRASH_DUMP 564 if (OLDMEM_BASE) 565 /* Forget all memory above the running kdump system */ 566 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 567 #endif 568 } 569 570 /* 571 * Reserve memory for kdump kernel to be loaded with kexec 572 */ 573 static void __init reserve_crashkernel(void) 574 { 575 #ifdef CONFIG_CRASH_DUMP 576 unsigned long long crash_base, crash_size; 577 phys_addr_t low, high; 578 int rc; 579 580 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 581 &crash_base); 582 583 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 584 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 585 if (rc || crash_size == 0) 586 return; 587 588 if (memblock.memory.regions[0].size < crash_size) { 589 pr_info("crashkernel reservation failed: %s\n", 590 "first memory chunk must be at least crashkernel size"); 591 return; 592 } 593 594 low = crash_base ?: OLDMEM_BASE; 595 high = low + crash_size; 596 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 597 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 598 crash_base = low; 599 } else { 600 /* Find suitable area in free memory */ 601 low = max_t(unsigned long, crash_size, sclp.hsa_size); 602 high = crash_base ? crash_base + crash_size : ULONG_MAX; 603 604 if (crash_base && crash_base < low) { 605 pr_info("crashkernel reservation failed: %s\n", 606 "crash_base too low"); 607 return; 608 } 609 low = crash_base ?: low; 610 crash_base = memblock_find_in_range(low, high, crash_size, 611 KEXEC_CRASH_MEM_ALIGN); 612 } 613 614 if (!crash_base) { 615 pr_info("crashkernel reservation failed: %s\n", 616 "no suitable area found"); 617 return; 618 } 619 620 if (register_memory_notifier(&kdump_mem_nb)) 621 return; 622 623 if (!OLDMEM_BASE && MACHINE_IS_VM) 624 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 625 crashk_res.start = crash_base; 626 crashk_res.end = crash_base + crash_size - 1; 627 memblock_remove(crash_base, crash_size); 628 pr_info("Reserving %lluMB of memory at %lluMB " 629 "for crashkernel (System RAM: %luMB)\n", 630 crash_size >> 20, crash_base >> 20, 631 (unsigned long)memblock.memory.total_size >> 20); 632 os_info_crashkernel_add(crash_base, crash_size); 633 #endif 634 } 635 636 /* 637 * Reserve the initrd from being used by memblock 638 */ 639 static void __init reserve_initrd(void) 640 { 641 #ifdef CONFIG_BLK_DEV_INITRD 642 if (!INITRD_START || !INITRD_SIZE) 643 return; 644 initrd_start = INITRD_START; 645 initrd_end = initrd_start + INITRD_SIZE; 646 memblock_reserve(INITRD_START, INITRD_SIZE); 647 #endif 648 } 649 650 /* 651 * Check for initrd being in usable memory 652 */ 653 static void __init check_initrd(void) 654 { 655 #ifdef CONFIG_BLK_DEV_INITRD 656 if (INITRD_START && INITRD_SIZE && 657 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 658 pr_err("The initial RAM disk does not fit into the memory\n"); 659 memblock_free(INITRD_START, INITRD_SIZE); 660 initrd_start = initrd_end = 0; 661 } 662 #endif 663 } 664 665 /* 666 * Reserve memory used for lowcore/command line/kernel image. 667 */ 668 static void __init reserve_kernel(void) 669 { 670 unsigned long start_pfn = PFN_UP(__pa(&_end)); 671 672 #ifdef CONFIG_DMA_API_DEBUG 673 /* 674 * DMA_API_DEBUG code stumbles over addresses from the 675 * range [_ehead, _stext]. Mark the memory as reserved 676 * so it is not used for CONFIG_DMA_API_DEBUG=y. 677 */ 678 memblock_reserve(0, PFN_PHYS(start_pfn)); 679 #else 680 memblock_reserve(0, (unsigned long)_ehead); 681 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 682 - (unsigned long)_stext); 683 #endif 684 } 685 686 static void __init setup_memory(void) 687 { 688 struct memblock_region *reg; 689 690 /* 691 * Init storage key for present memory 692 */ 693 for_each_memblock(memory, reg) { 694 storage_key_init_range(reg->base, reg->base + reg->size); 695 } 696 psw_set_key(PAGE_DEFAULT_KEY); 697 698 /* Only cosmetics */ 699 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 700 } 701 702 /* 703 * Setup hardware capabilities. 704 */ 705 static int __init setup_hwcaps(void) 706 { 707 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 708 struct cpuid cpu_id; 709 int i; 710 711 /* 712 * The store facility list bits numbers as found in the principles 713 * of operation are numbered with bit 1UL<<31 as number 0 to 714 * bit 1UL<<0 as number 31. 715 * Bit 0: instructions named N3, "backported" to esa-mode 716 * Bit 2: z/Architecture mode is active 717 * Bit 7: the store-facility-list-extended facility is installed 718 * Bit 17: the message-security assist is installed 719 * Bit 19: the long-displacement facility is installed 720 * Bit 21: the extended-immediate facility is installed 721 * Bit 22: extended-translation facility 3 is installed 722 * Bit 30: extended-translation facility 3 enhancement facility 723 * These get translated to: 724 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 725 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 726 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 727 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 728 */ 729 for (i = 0; i < 6; i++) 730 if (test_facility(stfl_bits[i])) 731 elf_hwcap |= 1UL << i; 732 733 if (test_facility(22) && test_facility(30)) 734 elf_hwcap |= HWCAP_S390_ETF3EH; 735 736 /* 737 * Check for additional facilities with store-facility-list-extended. 738 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 739 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 740 * as stored by stfl, bits 32-xxx contain additional facilities. 741 * How many facility words are stored depends on the number of 742 * doublewords passed to the instruction. The additional facilities 743 * are: 744 * Bit 42: decimal floating point facility is installed 745 * Bit 44: perform floating point operation facility is installed 746 * translated to: 747 * HWCAP_S390_DFP bit 6 (42 && 44). 748 */ 749 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 750 elf_hwcap |= HWCAP_S390_DFP; 751 752 /* 753 * Huge page support HWCAP_S390_HPAGE is bit 7. 754 */ 755 if (MACHINE_HAS_EDAT1) 756 elf_hwcap |= HWCAP_S390_HPAGE; 757 758 /* 759 * 64-bit register support for 31-bit processes 760 * HWCAP_S390_HIGH_GPRS is bit 9. 761 */ 762 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 763 764 /* 765 * Transactional execution support HWCAP_S390_TE is bit 10. 766 */ 767 if (MACHINE_HAS_TE) 768 elf_hwcap |= HWCAP_S390_TE; 769 770 /* 771 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 772 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 773 * instead of facility bit 129. 774 */ 775 if (MACHINE_HAS_VX) { 776 elf_hwcap |= HWCAP_S390_VXRS; 777 if (test_facility(134)) 778 elf_hwcap |= HWCAP_S390_VXRS_EXT; 779 if (test_facility(135)) 780 elf_hwcap |= HWCAP_S390_VXRS_BCD; 781 } 782 783 /* 784 * Guarded storage support HWCAP_S390_GS is bit 12. 785 */ 786 if (MACHINE_HAS_GS) 787 elf_hwcap |= HWCAP_S390_GS; 788 789 get_cpu_id(&cpu_id); 790 add_device_randomness(&cpu_id, sizeof(cpu_id)); 791 switch (cpu_id.machine) { 792 case 0x2064: 793 case 0x2066: 794 default: /* Use "z900" as default for 64 bit kernels. */ 795 strcpy(elf_platform, "z900"); 796 break; 797 case 0x2084: 798 case 0x2086: 799 strcpy(elf_platform, "z990"); 800 break; 801 case 0x2094: 802 case 0x2096: 803 strcpy(elf_platform, "z9-109"); 804 break; 805 case 0x2097: 806 case 0x2098: 807 strcpy(elf_platform, "z10"); 808 break; 809 case 0x2817: 810 case 0x2818: 811 strcpy(elf_platform, "z196"); 812 break; 813 case 0x2827: 814 case 0x2828: 815 strcpy(elf_platform, "zEC12"); 816 break; 817 case 0x2964: 818 case 0x2965: 819 strcpy(elf_platform, "z13"); 820 break; 821 case 0x3906: 822 strcpy(elf_platform, "z14"); 823 break; 824 } 825 826 /* 827 * Virtualization support HWCAP_INT_SIE is bit 0. 828 */ 829 if (sclp.has_sief2) 830 int_hwcap |= HWCAP_INT_SIE; 831 832 return 0; 833 } 834 arch_initcall(setup_hwcaps); 835 836 /* 837 * Add system information as device randomness 838 */ 839 static void __init setup_randomness(void) 840 { 841 struct sysinfo_3_2_2 *vmms; 842 843 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE); 844 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 845 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 846 memblock_free((unsigned long) vmms, PAGE_SIZE); 847 } 848 849 /* 850 * Find the correct size for the task_struct. This depends on 851 * the size of the struct fpu at the end of the thread_struct 852 * which is embedded in the task_struct. 853 */ 854 static void __init setup_task_size(void) 855 { 856 int task_size = sizeof(struct task_struct); 857 858 if (!MACHINE_HAS_VX) { 859 task_size -= sizeof(__vector128) * __NUM_VXRS; 860 task_size += sizeof(freg_t) * __NUM_FPRS; 861 } 862 arch_task_struct_size = task_size; 863 } 864 865 /* 866 * Setup function called from init/main.c just after the banner 867 * was printed. 868 */ 869 870 void __init setup_arch(char **cmdline_p) 871 { 872 /* 873 * print what head.S has found out about the machine 874 */ 875 if (MACHINE_IS_VM) 876 pr_info("Linux is running as a z/VM " 877 "guest operating system in 64-bit mode\n"); 878 else if (MACHINE_IS_KVM) 879 pr_info("Linux is running under KVM in 64-bit mode\n"); 880 else if (MACHINE_IS_LPAR) 881 pr_info("Linux is running natively in 64-bit mode\n"); 882 883 /* Have one command line that is parsed and saved in /proc/cmdline */ 884 /* boot_command_line has been already set up in early.c */ 885 *cmdline_p = boot_command_line; 886 887 ROOT_DEV = Root_RAM0; 888 889 /* Is init_mm really needed? */ 890 init_mm.start_code = PAGE_OFFSET; 891 init_mm.end_code = (unsigned long) &_etext; 892 init_mm.end_data = (unsigned long) &_edata; 893 init_mm.brk = (unsigned long) &_end; 894 895 parse_early_param(); 896 #ifdef CONFIG_CRASH_DUMP 897 /* Deactivate elfcorehdr= kernel parameter */ 898 elfcorehdr_addr = ELFCORE_ADDR_MAX; 899 #endif 900 901 os_info_init(); 902 setup_ipl(); 903 setup_task_size(); 904 905 /* Do some memory reservations *before* memory is added to memblock */ 906 reserve_memory_end(); 907 reserve_oldmem(); 908 reserve_kernel(); 909 reserve_initrd(); 910 memblock_allow_resize(); 911 912 /* Get information about *all* installed memory */ 913 detect_memory_memblock(); 914 915 remove_oldmem(); 916 917 /* 918 * Make sure all chunks are MAX_ORDER aligned so we don't need the 919 * extra checks that HOLES_IN_ZONE would require. 920 * 921 * Is this still required? 922 */ 923 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 924 925 setup_memory_end(); 926 setup_memory(); 927 dma_contiguous_reserve(memory_end); 928 vmcp_cma_reserve(); 929 930 check_initrd(); 931 reserve_crashkernel(); 932 #ifdef CONFIG_CRASH_DUMP 933 /* 934 * Be aware that smp_save_dump_cpus() triggers a system reset. 935 * Therefore CPU and device initialization should be done afterwards. 936 */ 937 smp_save_dump_cpus(); 938 #endif 939 940 setup_resources(); 941 setup_lowcore(); 942 smp_fill_possible_mask(); 943 cpu_detect_mhz_feature(); 944 cpu_init(); 945 numa_setup(); 946 smp_detect_cpus(); 947 topology_init_early(); 948 949 /* 950 * Create kernel page tables and switch to virtual addressing. 951 */ 952 paging_init(); 953 954 /* Setup default console */ 955 conmode_default(); 956 set_preferred_console(); 957 958 apply_alternative_instructions(); 959 if (IS_ENABLED(CONFIG_EXPOLINE)) 960 nospec_init_branches(); 961 962 /* Setup zfcpdump support */ 963 setup_zfcpdump(); 964 965 /* Add system specific data to the random pool */ 966 setup_randomness(); 967 } 968