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-map-ops.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 #include <linux/hugetlb.h> 53 54 #include <asm/boot_data.h> 55 #include <asm/ipl.h> 56 #include <asm/facility.h> 57 #include <asm/smp.h> 58 #include <asm/mmu_context.h> 59 #include <asm/cpcmd.h> 60 #include <asm/lowcore.h> 61 #include <asm/nmi.h> 62 #include <asm/irq.h> 63 #include <asm/page.h> 64 #include <asm/ptrace.h> 65 #include <asm/sections.h> 66 #include <asm/ebcdic.h> 67 #include <asm/diag.h> 68 #include <asm/os_info.h> 69 #include <asm/sclp.h> 70 #include <asm/stacktrace.h> 71 #include <asm/sysinfo.h> 72 #include <asm/numa.h> 73 #include <asm/alternative.h> 74 #include <asm/nospec-branch.h> 75 #include <asm/mem_detect.h> 76 #include <asm/uv.h> 77 #include <asm/asm-offsets.h> 78 #include "entry.h" 79 80 /* 81 * Machine setup.. 82 */ 83 unsigned int console_mode = 0; 84 EXPORT_SYMBOL(console_mode); 85 86 unsigned int console_devno = -1; 87 EXPORT_SYMBOL(console_devno); 88 89 unsigned int console_irq = -1; 90 EXPORT_SYMBOL(console_irq); 91 92 unsigned long elf_hwcap __read_mostly = 0; 93 char elf_platform[ELF_PLATFORM_SIZE]; 94 95 unsigned long int_hwcap = 0; 96 97 int __bootdata(noexec_disabled); 98 unsigned long __bootdata(ident_map_size); 99 struct mem_detect_info __bootdata(mem_detect); 100 101 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table); 102 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table); 103 unsigned long __bootdata_preserved(__stext_dma); 104 unsigned long __bootdata_preserved(__etext_dma); 105 unsigned long __bootdata_preserved(__sdma); 106 unsigned long __bootdata_preserved(__edma); 107 unsigned long __bootdata_preserved(__kaslr_offset); 108 unsigned int __bootdata_preserved(zlib_dfltcc_support); 109 EXPORT_SYMBOL(zlib_dfltcc_support); 110 u64 __bootdata_preserved(stfle_fac_list[16]); 111 EXPORT_SYMBOL(stfle_fac_list); 112 u64 __bootdata_preserved(alt_stfle_fac_list[16]); 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 unsigned long vmemmap_size; 123 124 unsigned long MODULES_VADDR; 125 unsigned long MODULES_END; 126 127 /* An array with a pointer to the lowcore of every CPU. */ 128 struct lowcore *lowcore_ptr[NR_CPUS]; 129 EXPORT_SYMBOL(lowcore_ptr); 130 131 /* 132 * The Write Back bit position in the physaddr is given by the SLPC PCI. 133 * Leaving the mask zero always uses write through which is safe 134 */ 135 unsigned long mio_wb_bit_mask __ro_after_init; 136 137 /* 138 * This is set up by the setup-routine at boot-time 139 * for S390 need to find out, what we have to setup 140 * using address 0x10400 ... 141 */ 142 143 #include <asm/setup.h> 144 145 /* 146 * condev= and conmode= setup parameter. 147 */ 148 149 static int __init condev_setup(char *str) 150 { 151 int vdev; 152 153 vdev = simple_strtoul(str, &str, 0); 154 if (vdev >= 0 && vdev < 65536) { 155 console_devno = vdev; 156 console_irq = -1; 157 } 158 return 1; 159 } 160 161 __setup("condev=", condev_setup); 162 163 static void __init set_preferred_console(void) 164 { 165 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 166 add_preferred_console("ttyS", 0, NULL); 167 else if (CONSOLE_IS_3270) 168 add_preferred_console("tty3270", 0, NULL); 169 else if (CONSOLE_IS_VT220) 170 add_preferred_console("ttysclp", 0, NULL); 171 else if (CONSOLE_IS_HVC) 172 add_preferred_console("hvc", 0, NULL); 173 } 174 175 static int __init conmode_setup(char *str) 176 { 177 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 178 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 179 SET_CONSOLE_SCLP; 180 #endif 181 #if defined(CONFIG_TN3215_CONSOLE) 182 if (!strcmp(str, "3215")) 183 SET_CONSOLE_3215; 184 #endif 185 #if defined(CONFIG_TN3270_CONSOLE) 186 if (!strcmp(str, "3270")) 187 SET_CONSOLE_3270; 188 #endif 189 set_preferred_console(); 190 return 1; 191 } 192 193 __setup("conmode=", conmode_setup); 194 195 static void __init conmode_default(void) 196 { 197 char query_buffer[1024]; 198 char *ptr; 199 200 if (MACHINE_IS_VM) { 201 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 202 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 203 ptr = strstr(query_buffer, "SUBCHANNEL ="); 204 console_irq = simple_strtoul(ptr + 13, NULL, 16); 205 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 206 ptr = strstr(query_buffer, "CONMODE"); 207 /* 208 * Set the conmode to 3215 so that the device recognition 209 * will set the cu_type of the console to 3215. If the 210 * conmode is 3270 and we don't set it back then both 211 * 3215 and the 3270 driver will try to access the console 212 * device (3215 as console and 3270 as normal tty). 213 */ 214 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 215 if (ptr == NULL) { 216 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 217 SET_CONSOLE_SCLP; 218 #endif 219 return; 220 } 221 if (str_has_prefix(ptr + 8, "3270")) { 222 #if defined(CONFIG_TN3270_CONSOLE) 223 SET_CONSOLE_3270; 224 #elif defined(CONFIG_TN3215_CONSOLE) 225 SET_CONSOLE_3215; 226 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 227 SET_CONSOLE_SCLP; 228 #endif 229 } else if (str_has_prefix(ptr + 8, "3215")) { 230 #if defined(CONFIG_TN3215_CONSOLE) 231 SET_CONSOLE_3215; 232 #elif defined(CONFIG_TN3270_CONSOLE) 233 SET_CONSOLE_3270; 234 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 235 SET_CONSOLE_SCLP; 236 #endif 237 } 238 } else if (MACHINE_IS_KVM) { 239 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 240 SET_CONSOLE_VT220; 241 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 242 SET_CONSOLE_SCLP; 243 else 244 SET_CONSOLE_HVC; 245 } else { 246 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 247 SET_CONSOLE_SCLP; 248 #endif 249 } 250 } 251 252 #ifdef CONFIG_CRASH_DUMP 253 static void __init setup_zfcpdump(void) 254 { 255 if (!is_ipl_type_dump()) 256 return; 257 if (OLDMEM_BASE) 258 return; 259 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 260 console_loglevel = 2; 261 } 262 #else 263 static inline void setup_zfcpdump(void) {} 264 #endif /* CONFIG_CRASH_DUMP */ 265 266 /* 267 * Reboot, halt and power_off stubs. They just call _machine_restart, 268 * _machine_halt or _machine_power_off. 269 */ 270 271 void machine_restart(char *command) 272 { 273 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 274 /* 275 * Only unblank the console if we are called in enabled 276 * context or a bust_spinlocks cleared the way for us. 277 */ 278 console_unblank(); 279 _machine_restart(command); 280 } 281 282 void machine_halt(void) 283 { 284 if (!in_interrupt() || oops_in_progress) 285 /* 286 * Only unblank the console if we are called in enabled 287 * context or a bust_spinlocks cleared the way for us. 288 */ 289 console_unblank(); 290 _machine_halt(); 291 } 292 293 void machine_power_off(void) 294 { 295 if (!in_interrupt() || oops_in_progress) 296 /* 297 * Only unblank the console if we are called in enabled 298 * context or a bust_spinlocks cleared the way for us. 299 */ 300 console_unblank(); 301 _machine_power_off(); 302 } 303 304 /* 305 * Dummy power off function. 306 */ 307 void (*pm_power_off)(void) = machine_power_off; 308 EXPORT_SYMBOL_GPL(pm_power_off); 309 310 void *restart_stack; 311 312 unsigned long stack_alloc(void) 313 { 314 #ifdef CONFIG_VMAP_STACK 315 return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE, 316 THREADINFO_GFP, NUMA_NO_NODE, 317 __builtin_return_address(0)); 318 #else 319 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 320 #endif 321 } 322 323 void stack_free(unsigned long stack) 324 { 325 #ifdef CONFIG_VMAP_STACK 326 vfree((void *) stack); 327 #else 328 free_pages(stack, THREAD_SIZE_ORDER); 329 #endif 330 } 331 332 int __init arch_early_irq_init(void) 333 { 334 unsigned long stack; 335 336 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 337 if (!stack) 338 panic("Couldn't allocate async stack"); 339 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 340 return 0; 341 } 342 343 void __init arch_call_rest_init(void) 344 { 345 unsigned long stack; 346 347 stack = stack_alloc(); 348 if (!stack) 349 panic("Couldn't allocate kernel stack"); 350 current->stack = (void *) stack; 351 #ifdef CONFIG_VMAP_STACK 352 current->stack_vm_area = (void *) stack; 353 #endif 354 set_task_stack_end_magic(current); 355 stack += STACK_INIT_OFFSET; 356 S390_lowcore.kernel_stack = stack; 357 call_on_stack_noreturn(rest_init, stack); 358 } 359 360 static void __init setup_lowcore_dat_off(void) 361 { 362 unsigned long int_psw_mask = PSW_KERNEL_BITS; 363 unsigned long mcck_stack; 364 struct lowcore *lc; 365 366 if (IS_ENABLED(CONFIG_KASAN)) 367 int_psw_mask |= PSW_MASK_DAT; 368 369 /* 370 * Setup lowcore for boot cpu 371 */ 372 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 373 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 374 if (!lc) 375 panic("%s: Failed to allocate %zu bytes align=%zx\n", 376 __func__, sizeof(*lc), sizeof(*lc)); 377 378 lc->restart_psw.mask = PSW_KERNEL_BITS; 379 lc->restart_psw.addr = (unsigned long) restart_int_handler; 380 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 381 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 382 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 383 lc->svc_new_psw.addr = (unsigned long) system_call; 384 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 385 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 386 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 387 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 388 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 389 lc->io_new_psw.addr = (unsigned long) io_int_handler; 390 lc->clock_comparator = clock_comparator_max; 391 lc->nodat_stack = ((unsigned long) &init_thread_union) 392 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 393 lc->current_task = (unsigned long)&init_task; 394 lc->lpp = LPP_MAGIC; 395 lc->machine_flags = S390_lowcore.machine_flags; 396 lc->preempt_count = S390_lowcore.preempt_count; 397 nmi_alloc_boot_cpu(lc); 398 lc->sys_enter_timer = S390_lowcore.sys_enter_timer; 399 lc->exit_timer = S390_lowcore.exit_timer; 400 lc->user_timer = S390_lowcore.user_timer; 401 lc->system_timer = S390_lowcore.system_timer; 402 lc->steal_timer = S390_lowcore.steal_timer; 403 lc->last_update_timer = S390_lowcore.last_update_timer; 404 lc->last_update_clock = S390_lowcore.last_update_clock; 405 406 /* 407 * Allocate the global restart stack which is the same for 408 * all CPUs in cast *one* of them does a PSW restart. 409 */ 410 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 411 if (!restart_stack) 412 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 413 __func__, THREAD_SIZE, THREAD_SIZE); 414 restart_stack += STACK_INIT_OFFSET; 415 416 /* 417 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 418 * restart data to the absolute zero lowcore. This is necessary if 419 * PSW restart is done on an offline CPU that has lowcore zero. 420 */ 421 lc->restart_stack = (unsigned long) restart_stack; 422 lc->restart_fn = (unsigned long) do_restart; 423 lc->restart_data = 0; 424 lc->restart_source = -1UL; 425 426 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); 427 if (!mcck_stack) 428 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 429 __func__, THREAD_SIZE, THREAD_SIZE); 430 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET; 431 432 /* Setup absolute zero lowcore */ 433 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 434 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 435 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 436 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 437 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 438 439 lc->spinlock_lockval = arch_spin_lockval(0); 440 lc->spinlock_index = 0; 441 arch_spin_lock_setup(0); 442 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 443 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 444 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 445 lc->preempt_count = PREEMPT_DISABLED; 446 447 set_prefix((u32)(unsigned long) lc); 448 lowcore_ptr[0] = lc; 449 } 450 451 static void __init setup_lowcore_dat_on(void) 452 { 453 __ctl_clear_bit(0, 28); 454 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 455 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 456 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 457 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 458 __ctl_set_bit(0, 28); 459 } 460 461 static struct resource code_resource = { 462 .name = "Kernel code", 463 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 464 }; 465 466 static struct resource data_resource = { 467 .name = "Kernel data", 468 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 469 }; 470 471 static struct resource bss_resource = { 472 .name = "Kernel bss", 473 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 474 }; 475 476 static struct resource __initdata *standard_resources[] = { 477 &code_resource, 478 &data_resource, 479 &bss_resource, 480 }; 481 482 static void __init setup_resources(void) 483 { 484 struct resource *res, *std_res, *sub_res; 485 phys_addr_t start, end; 486 int j; 487 u64 i; 488 489 code_resource.start = (unsigned long) _text; 490 code_resource.end = (unsigned long) _etext - 1; 491 data_resource.start = (unsigned long) _etext; 492 data_resource.end = (unsigned long) _edata - 1; 493 bss_resource.start = (unsigned long) __bss_start; 494 bss_resource.end = (unsigned long) __bss_stop - 1; 495 496 for_each_mem_range(i, &start, &end) { 497 res = memblock_alloc(sizeof(*res), 8); 498 if (!res) 499 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 500 __func__, sizeof(*res), 8); 501 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 502 503 res->name = "System RAM"; 504 res->start = start; 505 /* 506 * In memblock, end points to the first byte after the 507 * range while in resourses, end points to the last byte in 508 * the range. 509 */ 510 res->end = end - 1; 511 request_resource(&iomem_resource, res); 512 513 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 514 std_res = standard_resources[j]; 515 if (std_res->start < res->start || 516 std_res->start > res->end) 517 continue; 518 if (std_res->end > res->end) { 519 sub_res = memblock_alloc(sizeof(*sub_res), 8); 520 if (!sub_res) 521 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 522 __func__, sizeof(*sub_res), 8); 523 *sub_res = *std_res; 524 sub_res->end = res->end; 525 std_res->start = res->end + 1; 526 request_resource(res, sub_res); 527 } else { 528 request_resource(res, std_res); 529 } 530 } 531 } 532 #ifdef CONFIG_CRASH_DUMP 533 /* 534 * Re-add removed crash kernel memory as reserved memory. This makes 535 * sure it will be mapped with the identity mapping and struct pages 536 * will be created, so it can be resized later on. 537 * However add it later since the crash kernel resource should not be 538 * part of the System RAM resource. 539 */ 540 if (crashk_res.end) { 541 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 542 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 543 insert_resource(&iomem_resource, &crashk_res); 544 } 545 #endif 546 } 547 548 static void __init setup_memory_end(void) 549 { 550 memblock_remove(ident_map_size, ULONG_MAX); 551 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 552 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 553 } 554 555 #ifdef CONFIG_CRASH_DUMP 556 557 /* 558 * When kdump is enabled, we have to ensure that no memory from the area 559 * [0 - crashkernel memory size] is set offline - it will be exchanged with 560 * the crashkernel memory region when kdump is triggered. The crashkernel 561 * memory region can never get offlined (pages are unmovable). 562 */ 563 static int kdump_mem_notifier(struct notifier_block *nb, 564 unsigned long action, void *data) 565 { 566 struct memory_notify *arg = data; 567 568 if (action != MEM_GOING_OFFLINE) 569 return NOTIFY_OK; 570 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 571 return NOTIFY_BAD; 572 return NOTIFY_OK; 573 } 574 575 static struct notifier_block kdump_mem_nb = { 576 .notifier_call = kdump_mem_notifier, 577 }; 578 579 #endif 580 581 /* 582 * Make sure that the area above identity mapping is protected 583 */ 584 static void __init reserve_above_ident_map(void) 585 { 586 memblock_reserve(ident_map_size, ULONG_MAX); 587 } 588 589 /* 590 * Reserve memory for kdump kernel to be loaded with kexec 591 */ 592 static void __init reserve_crashkernel(void) 593 { 594 #ifdef CONFIG_CRASH_DUMP 595 unsigned long long crash_base, crash_size; 596 phys_addr_t low, high; 597 int rc; 598 599 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, 600 &crash_base); 601 602 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 603 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 604 if (rc || crash_size == 0) 605 return; 606 607 if (memblock.memory.regions[0].size < crash_size) { 608 pr_info("crashkernel reservation failed: %s\n", 609 "first memory chunk must be at least crashkernel size"); 610 return; 611 } 612 613 low = crash_base ?: OLDMEM_BASE; 614 high = low + crash_size; 615 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 616 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 617 crash_base = low; 618 } else { 619 /* Find suitable area in free memory */ 620 low = max_t(unsigned long, crash_size, sclp.hsa_size); 621 high = crash_base ? crash_base + crash_size : ULONG_MAX; 622 623 if (crash_base && crash_base < low) { 624 pr_info("crashkernel reservation failed: %s\n", 625 "crash_base too low"); 626 return; 627 } 628 low = crash_base ?: low; 629 crash_base = memblock_find_in_range(low, high, crash_size, 630 KEXEC_CRASH_MEM_ALIGN); 631 } 632 633 if (!crash_base) { 634 pr_info("crashkernel reservation failed: %s\n", 635 "no suitable area found"); 636 return; 637 } 638 639 if (register_memory_notifier(&kdump_mem_nb)) 640 return; 641 642 if (!OLDMEM_BASE && MACHINE_IS_VM) 643 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 644 crashk_res.start = crash_base; 645 crashk_res.end = crash_base + crash_size - 1; 646 memblock_remove(crash_base, crash_size); 647 pr_info("Reserving %lluMB of memory at %lluMB " 648 "for crashkernel (System RAM: %luMB)\n", 649 crash_size >> 20, crash_base >> 20, 650 (unsigned long)memblock.memory.total_size >> 20); 651 os_info_crashkernel_add(crash_base, crash_size); 652 #endif 653 } 654 655 /* 656 * Reserve the initrd from being used by memblock 657 */ 658 static void __init reserve_initrd(void) 659 { 660 #ifdef CONFIG_BLK_DEV_INITRD 661 if (!INITRD_START || !INITRD_SIZE) 662 return; 663 initrd_start = INITRD_START; 664 initrd_end = initrd_start + INITRD_SIZE; 665 memblock_reserve(INITRD_START, INITRD_SIZE); 666 #endif 667 } 668 669 /* 670 * Reserve the memory area used to pass the certificate lists 671 */ 672 static void __init reserve_certificate_list(void) 673 { 674 if (ipl_cert_list_addr) 675 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 676 } 677 678 static void __init reserve_mem_detect_info(void) 679 { 680 unsigned long start, size; 681 682 get_mem_detect_reserved(&start, &size); 683 if (size) 684 memblock_reserve(start, size); 685 } 686 687 static void __init free_mem_detect_info(void) 688 { 689 unsigned long start, size; 690 691 get_mem_detect_reserved(&start, &size); 692 if (size) 693 memblock_free(start, size); 694 } 695 696 static const char * __init get_mem_info_source(void) 697 { 698 switch (mem_detect.info_source) { 699 case MEM_DETECT_SCLP_STOR_INFO: 700 return "sclp storage info"; 701 case MEM_DETECT_DIAG260: 702 return "diag260"; 703 case MEM_DETECT_SCLP_READ_INFO: 704 return "sclp read info"; 705 case MEM_DETECT_BIN_SEARCH: 706 return "binary search"; 707 } 708 return "none"; 709 } 710 711 static void __init memblock_add_mem_detect_info(void) 712 { 713 unsigned long start, end; 714 int i; 715 716 pr_debug("physmem info source: %s (%hhd)\n", 717 get_mem_info_source(), mem_detect.info_source); 718 /* keep memblock lists close to the kernel */ 719 memblock_set_bottom_up(true); 720 for_each_mem_detect_block(i, &start, &end) { 721 memblock_add(start, end - start); 722 memblock_physmem_add(start, end - start); 723 } 724 memblock_set_bottom_up(false); 725 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 726 memblock_dump_all(); 727 } 728 729 /* 730 * Check for initrd being in usable memory 731 */ 732 static void __init check_initrd(void) 733 { 734 #ifdef CONFIG_BLK_DEV_INITRD 735 if (INITRD_START && INITRD_SIZE && 736 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 737 pr_err("The initial RAM disk does not fit into the memory\n"); 738 memblock_free(INITRD_START, INITRD_SIZE); 739 initrd_start = initrd_end = 0; 740 } 741 #endif 742 } 743 744 /* 745 * Reserve memory used for lowcore/command line/kernel image. 746 */ 747 static void __init reserve_kernel(void) 748 { 749 unsigned long start_pfn = PFN_UP(__pa(_end)); 750 751 memblock_reserve(0, HEAD_END); 752 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 753 - (unsigned long)_stext); 754 memblock_reserve(__sdma, __edma - __sdma); 755 } 756 757 static void __init setup_memory(void) 758 { 759 phys_addr_t start, end; 760 u64 i; 761 762 /* 763 * Init storage key for present memory 764 */ 765 for_each_mem_range(i, &start, &end) 766 storage_key_init_range(start, end); 767 768 psw_set_key(PAGE_DEFAULT_KEY); 769 770 /* Only cosmetics */ 771 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 772 } 773 774 /* 775 * Setup hardware capabilities. 776 */ 777 static int __init setup_hwcaps(void) 778 { 779 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 780 struct cpuid cpu_id; 781 int i; 782 783 /* 784 * The store facility list bits numbers as found in the principles 785 * of operation are numbered with bit 1UL<<31 as number 0 to 786 * bit 1UL<<0 as number 31. 787 * Bit 0: instructions named N3, "backported" to esa-mode 788 * Bit 2: z/Architecture mode is active 789 * Bit 7: the store-facility-list-extended facility is installed 790 * Bit 17: the message-security assist is installed 791 * Bit 19: the long-displacement facility is installed 792 * Bit 21: the extended-immediate facility is installed 793 * Bit 22: extended-translation facility 3 is installed 794 * Bit 30: extended-translation facility 3 enhancement facility 795 * These get translated to: 796 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 797 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 798 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 799 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 800 */ 801 for (i = 0; i < 6; i++) 802 if (test_facility(stfl_bits[i])) 803 elf_hwcap |= 1UL << i; 804 805 if (test_facility(22) && test_facility(30)) 806 elf_hwcap |= HWCAP_S390_ETF3EH; 807 808 /* 809 * Check for additional facilities with store-facility-list-extended. 810 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 811 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 812 * as stored by stfl, bits 32-xxx contain additional facilities. 813 * How many facility words are stored depends on the number of 814 * doublewords passed to the instruction. The additional facilities 815 * are: 816 * Bit 42: decimal floating point facility is installed 817 * Bit 44: perform floating point operation facility is installed 818 * translated to: 819 * HWCAP_S390_DFP bit 6 (42 && 44). 820 */ 821 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 822 elf_hwcap |= HWCAP_S390_DFP; 823 824 /* 825 * Huge page support HWCAP_S390_HPAGE is bit 7. 826 */ 827 if (MACHINE_HAS_EDAT1) 828 elf_hwcap |= HWCAP_S390_HPAGE; 829 830 /* 831 * 64-bit register support for 31-bit processes 832 * HWCAP_S390_HIGH_GPRS is bit 9. 833 */ 834 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 835 836 /* 837 * Transactional execution support HWCAP_S390_TE is bit 10. 838 */ 839 if (MACHINE_HAS_TE) 840 elf_hwcap |= HWCAP_S390_TE; 841 842 /* 843 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 844 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 845 * instead of facility bit 129. 846 */ 847 if (MACHINE_HAS_VX) { 848 elf_hwcap |= HWCAP_S390_VXRS; 849 if (test_facility(134)) 850 elf_hwcap |= HWCAP_S390_VXRS_BCD; 851 if (test_facility(135)) 852 elf_hwcap |= HWCAP_S390_VXRS_EXT; 853 if (test_facility(148)) 854 elf_hwcap |= HWCAP_S390_VXRS_EXT2; 855 if (test_facility(152)) 856 elf_hwcap |= HWCAP_S390_VXRS_PDE; 857 } 858 if (test_facility(150)) 859 elf_hwcap |= HWCAP_S390_SORT; 860 if (test_facility(151)) 861 elf_hwcap |= HWCAP_S390_DFLT; 862 863 /* 864 * Guarded storage support HWCAP_S390_GS is bit 12. 865 */ 866 if (MACHINE_HAS_GS) 867 elf_hwcap |= HWCAP_S390_GS; 868 869 get_cpu_id(&cpu_id); 870 add_device_randomness(&cpu_id, sizeof(cpu_id)); 871 switch (cpu_id.machine) { 872 case 0x2064: 873 case 0x2066: 874 default: /* Use "z900" as default for 64 bit kernels. */ 875 strcpy(elf_platform, "z900"); 876 break; 877 case 0x2084: 878 case 0x2086: 879 strcpy(elf_platform, "z990"); 880 break; 881 case 0x2094: 882 case 0x2096: 883 strcpy(elf_platform, "z9-109"); 884 break; 885 case 0x2097: 886 case 0x2098: 887 strcpy(elf_platform, "z10"); 888 break; 889 case 0x2817: 890 case 0x2818: 891 strcpy(elf_platform, "z196"); 892 break; 893 case 0x2827: 894 case 0x2828: 895 strcpy(elf_platform, "zEC12"); 896 break; 897 case 0x2964: 898 case 0x2965: 899 strcpy(elf_platform, "z13"); 900 break; 901 case 0x3906: 902 case 0x3907: 903 strcpy(elf_platform, "z14"); 904 break; 905 case 0x8561: 906 case 0x8562: 907 strcpy(elf_platform, "z15"); 908 break; 909 } 910 911 /* 912 * Virtualization support HWCAP_INT_SIE is bit 0. 913 */ 914 if (sclp.has_sief2) 915 int_hwcap |= HWCAP_INT_SIE; 916 917 return 0; 918 } 919 arch_initcall(setup_hwcaps); 920 921 /* 922 * Add system information as device randomness 923 */ 924 static void __init setup_randomness(void) 925 { 926 struct sysinfo_3_2_2 *vmms; 927 928 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 929 PAGE_SIZE); 930 if (!vmms) 931 panic("Failed to allocate memory for sysinfo structure\n"); 932 933 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 934 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 935 memblock_free((unsigned long) vmms, PAGE_SIZE); 936 } 937 938 /* 939 * Find the correct size for the task_struct. This depends on 940 * the size of the struct fpu at the end of the thread_struct 941 * which is embedded in the task_struct. 942 */ 943 static void __init setup_task_size(void) 944 { 945 int task_size = sizeof(struct task_struct); 946 947 if (!MACHINE_HAS_VX) { 948 task_size -= sizeof(__vector128) * __NUM_VXRS; 949 task_size += sizeof(freg_t) * __NUM_FPRS; 950 } 951 arch_task_struct_size = task_size; 952 } 953 954 /* 955 * Issue diagnose 318 to set the control program name and 956 * version codes. 957 */ 958 static void __init setup_control_program_code(void) 959 { 960 union diag318_info diag318_info = { 961 .cpnc = CPNC_LINUX, 962 .cpvc = 0, 963 }; 964 965 if (!sclp.has_diag318) 966 return; 967 968 diag_stat_inc(DIAG_STAT_X318); 969 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 970 } 971 972 /* 973 * Print the component list from the IPL report 974 */ 975 static void __init log_component_list(void) 976 { 977 struct ipl_rb_component_entry *ptr, *end; 978 char *str; 979 980 if (!early_ipl_comp_list_addr) 981 return; 982 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 983 pr_info("Linux is running with Secure-IPL enabled\n"); 984 else 985 pr_info("Linux is running with Secure-IPL disabled\n"); 986 ptr = (void *) early_ipl_comp_list_addr; 987 end = (void *) ptr + early_ipl_comp_list_size; 988 pr_info("The IPL report contains the following components:\n"); 989 while (ptr < end) { 990 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 991 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 992 str = "signed, verified"; 993 else 994 str = "signed, verification failed"; 995 } else { 996 str = "not signed"; 997 } 998 pr_info("%016llx - %016llx (%s)\n", 999 ptr->addr, ptr->addr + ptr->len, str); 1000 ptr++; 1001 } 1002 } 1003 1004 /* 1005 * Setup function called from init/main.c just after the banner 1006 * was printed. 1007 */ 1008 1009 void __init setup_arch(char **cmdline_p) 1010 { 1011 /* 1012 * print what head.S has found out about the machine 1013 */ 1014 if (MACHINE_IS_VM) 1015 pr_info("Linux is running as a z/VM " 1016 "guest operating system in 64-bit mode\n"); 1017 else if (MACHINE_IS_KVM) 1018 pr_info("Linux is running under KVM in 64-bit mode\n"); 1019 else if (MACHINE_IS_LPAR) 1020 pr_info("Linux is running natively in 64-bit mode\n"); 1021 else 1022 pr_info("Linux is running as a guest in 64-bit mode\n"); 1023 1024 log_component_list(); 1025 1026 /* Have one command line that is parsed and saved in /proc/cmdline */ 1027 /* boot_command_line has been already set up in early.c */ 1028 *cmdline_p = boot_command_line; 1029 1030 ROOT_DEV = Root_RAM0; 1031 1032 setup_initial_init_mm(_text, _etext, _edata, _end); 1033 1034 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1035 nospec_auto_detect(); 1036 1037 jump_label_init(); 1038 parse_early_param(); 1039 #ifdef CONFIG_CRASH_DUMP 1040 /* Deactivate elfcorehdr= kernel parameter */ 1041 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1042 #endif 1043 1044 os_info_init(); 1045 setup_ipl(); 1046 setup_task_size(); 1047 setup_control_program_code(); 1048 1049 /* Do some memory reservations *before* memory is added to memblock */ 1050 reserve_above_ident_map(); 1051 reserve_kernel(); 1052 reserve_initrd(); 1053 reserve_certificate_list(); 1054 reserve_mem_detect_info(); 1055 memblock_allow_resize(); 1056 1057 /* Get information about *all* installed memory */ 1058 memblock_add_mem_detect_info(); 1059 1060 free_mem_detect_info(); 1061 1062 setup_uv(); 1063 setup_memory_end(); 1064 setup_memory(); 1065 dma_contiguous_reserve(ident_map_size); 1066 vmcp_cma_reserve(); 1067 if (MACHINE_HAS_EDAT2) 1068 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 1069 1070 check_initrd(); 1071 reserve_crashkernel(); 1072 #ifdef CONFIG_CRASH_DUMP 1073 /* 1074 * Be aware that smp_save_dump_cpus() triggers a system reset. 1075 * Therefore CPU and device initialization should be done afterwards. 1076 */ 1077 smp_save_dump_cpus(); 1078 #endif 1079 1080 setup_resources(); 1081 setup_lowcore_dat_off(); 1082 smp_fill_possible_mask(); 1083 cpu_detect_mhz_feature(); 1084 cpu_init(); 1085 numa_setup(); 1086 smp_detect_cpus(); 1087 topology_init_early(); 1088 1089 /* 1090 * Create kernel page tables and switch to virtual addressing. 1091 */ 1092 paging_init(); 1093 1094 /* 1095 * After paging_init created the kernel page table, the new PSWs 1096 * in lowcore can now run with DAT enabled. 1097 */ 1098 setup_lowcore_dat_on(); 1099 1100 /* Setup default console */ 1101 conmode_default(); 1102 set_preferred_console(); 1103 1104 apply_alternative_instructions(); 1105 if (IS_ENABLED(CONFIG_EXPOLINE)) 1106 nospec_init_branches(); 1107 1108 /* Setup zfcp/nvme dump support */ 1109 setup_zfcpdump(); 1110 1111 /* Add system specific data to the random pool */ 1112 setup_randomness(); 1113 } 1114