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#include <linux/kmemleak.h> 54 55#include <asm/archrandom.h> 56#include <asm/boot_data.h> 57#include <asm/ipl.h> 58#include <asm/facility.h> 59#include <asm/smp.h> 60#include <asm/mmu_context.h> 61#include <asm/cpcmd.h> 62#include <asm/abs_lowcore.h> 63#include <asm/nmi.h> 64#include <asm/irq.h> 65#include <asm/page.h> 66#include <asm/ptrace.h> 67#include <asm/sections.h> 68#include <asm/ebcdic.h> 69#include <asm/diag.h> 70#include <asm/os_info.h> 71#include <asm/sclp.h> 72#include <asm/stacktrace.h> 73#include <asm/sysinfo.h> 74#include <asm/numa.h> 75#include <asm/alternative.h> 76#include <asm/nospec-branch.h> 77#include <asm/physmem_info.h> 78#include <asm/maccess.h> 79#include <asm/uv.h> 80#include <asm/asm-offsets.h> 81#include "entry.h" 82 83/* 84 * Machine setup.. 85 */ 86unsigned int console_mode = 0; 87EXPORT_SYMBOL(console_mode); 88 89unsigned int console_devno = -1; 90EXPORT_SYMBOL(console_devno); 91 92unsigned int console_irq = -1; 93EXPORT_SYMBOL(console_irq); 94 95/* 96 * Some code and data needs to stay below 2 GB, even when the kernel would be 97 * relocated above 2 GB, because it has to use 31 bit addresses. 98 * Such code and data is part of the .amode31 section. 99 */ 100char __amode31_ref *__samode31 = _samode31; 101char __amode31_ref *__eamode31 = _eamode31; 102char __amode31_ref *__stext_amode31 = _stext_amode31; 103char __amode31_ref *__etext_amode31 = _etext_amode31; 104struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table; 105struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table; 106 107/* 108 * Control registers CR2, CR5 and CR15 are initialized with addresses 109 * of tables that must be placed below 2G which is handled by the AMODE31 110 * sections. 111 * Because the AMODE31 sections are relocated below 2G at startup, 112 * the content of control registers CR2, CR5 and CR15 must be updated 113 * with new addresses after the relocation. The initial initialization of 114 * control registers occurs in head64.S and then gets updated again after AMODE31 115 * relocation. We must access the relevant AMODE31 tables indirectly via 116 * pointers placed in the .amode31.refs linker section. Those pointers get 117 * updated automatically during AMODE31 relocation and always contain a valid 118 * address within AMODE31 sections. 119 */ 120 121static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64); 122 123static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = { 124 [1] = 0xffffffffffffffff 125}; 126 127static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = { 128 0x80000000, 0, 0, 0, 129 0x80000000, 0, 0, 0, 130 0x80000000, 0, 0, 0, 131 0x80000000, 0, 0, 0, 132 0x80000000, 0, 0, 0, 133 0x80000000, 0, 0, 0, 134 0x80000000, 0, 0, 0, 135 0x80000000, 0, 0, 0 136}; 137 138static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = { 139 0, 0, 0x89000000, 0, 140 0, 0, 0x8a000000, 0 141}; 142 143static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31; 144static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31; 145static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31; 146static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31; 147 148unsigned long __bootdata_preserved(max_mappable); 149unsigned long __bootdata(ident_map_size); 150struct physmem_info __bootdata(physmem_info); 151 152unsigned long __bootdata_preserved(__kaslr_offset); 153int __bootdata_preserved(__kaslr_enabled); 154unsigned int __bootdata_preserved(zlib_dfltcc_support); 155EXPORT_SYMBOL(zlib_dfltcc_support); 156u64 __bootdata_preserved(stfle_fac_list[16]); 157EXPORT_SYMBOL(stfle_fac_list); 158u64 __bootdata_preserved(alt_stfle_fac_list[16]); 159struct oldmem_data __bootdata_preserved(oldmem_data); 160 161unsigned long VMALLOC_START; 162EXPORT_SYMBOL(VMALLOC_START); 163 164unsigned long VMALLOC_END; 165EXPORT_SYMBOL(VMALLOC_END); 166 167struct page *vmemmap; 168EXPORT_SYMBOL(vmemmap); 169unsigned long vmemmap_size; 170 171unsigned long MODULES_VADDR; 172unsigned long MODULES_END; 173 174/* An array with a pointer to the lowcore of every CPU. */ 175struct lowcore *lowcore_ptr[NR_CPUS]; 176EXPORT_SYMBOL(lowcore_ptr); 177 178DEFINE_STATIC_KEY_FALSE(cpu_has_bear); 179 180/* 181 * The Write Back bit position in the physaddr is given by the SLPC PCI. 182 * Leaving the mask zero always uses write through which is safe 183 */ 184unsigned long mio_wb_bit_mask __ro_after_init; 185 186/* 187 * This is set up by the setup-routine at boot-time 188 * for S390 need to find out, what we have to setup 189 * using address 0x10400 ... 190 */ 191 192#include <asm/setup.h> 193 194/* 195 * condev= and conmode= setup parameter. 196 */ 197 198static int __init condev_setup(char *str) 199{ 200 int vdev; 201 202 vdev = simple_strtoul(str, &str, 0); 203 if (vdev >= 0 && vdev < 65536) { 204 console_devno = vdev; 205 console_irq = -1; 206 } 207 return 1; 208} 209 210__setup("condev=", condev_setup); 211 212static void __init set_preferred_console(void) 213{ 214 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 215 add_preferred_console("ttyS", 0, NULL); 216 else if (CONSOLE_IS_3270) 217 add_preferred_console("tty3270", 0, NULL); 218 else if (CONSOLE_IS_VT220) 219 add_preferred_console("ttysclp", 0, NULL); 220 else if (CONSOLE_IS_HVC) 221 add_preferred_console("hvc", 0, NULL); 222} 223 224static int __init conmode_setup(char *str) 225{ 226#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 227 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 228 SET_CONSOLE_SCLP; 229#endif 230#if defined(CONFIG_TN3215_CONSOLE) 231 if (!strcmp(str, "3215")) 232 SET_CONSOLE_3215; 233#endif 234#if defined(CONFIG_TN3270_CONSOLE) 235 if (!strcmp(str, "3270")) 236 SET_CONSOLE_3270; 237#endif 238 set_preferred_console(); 239 return 1; 240} 241 242__setup("conmode=", conmode_setup); 243 244static void __init conmode_default(void) 245{ 246 char query_buffer[1024]; 247 char *ptr; 248 249 if (MACHINE_IS_VM) { 250 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 251 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 252 ptr = strstr(query_buffer, "SUBCHANNEL ="); 253 console_irq = simple_strtoul(ptr + 13, NULL, 16); 254 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 255 ptr = strstr(query_buffer, "CONMODE"); 256 /* 257 * Set the conmode to 3215 so that the device recognition 258 * will set the cu_type of the console to 3215. If the 259 * conmode is 3270 and we don't set it back then both 260 * 3215 and the 3270 driver will try to access the console 261 * device (3215 as console and 3270 as normal tty). 262 */ 263 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 264 if (ptr == NULL) { 265#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 266 SET_CONSOLE_SCLP; 267#endif 268 return; 269 } 270 if (str_has_prefix(ptr + 8, "3270")) { 271#if defined(CONFIG_TN3270_CONSOLE) 272 SET_CONSOLE_3270; 273#elif defined(CONFIG_TN3215_CONSOLE) 274 SET_CONSOLE_3215; 275#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 276 SET_CONSOLE_SCLP; 277#endif 278 } else if (str_has_prefix(ptr + 8, "3215")) { 279#if defined(CONFIG_TN3215_CONSOLE) 280 SET_CONSOLE_3215; 281#elif defined(CONFIG_TN3270_CONSOLE) 282 SET_CONSOLE_3270; 283#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 284 SET_CONSOLE_SCLP; 285#endif 286 } 287 } else if (MACHINE_IS_KVM) { 288 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 289 SET_CONSOLE_VT220; 290 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 291 SET_CONSOLE_SCLP; 292 else 293 SET_CONSOLE_HVC; 294 } else { 295#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 296 SET_CONSOLE_SCLP; 297#endif 298 } 299} 300 301#ifdef CONFIG_CRASH_DUMP 302static void __init setup_zfcpdump(void) 303{ 304 if (!is_ipl_type_dump()) 305 return; 306 if (oldmem_data.start) 307 return; 308 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE); 309 console_loglevel = 2; 310} 311#else 312static inline void setup_zfcpdump(void) {} 313#endif /* CONFIG_CRASH_DUMP */ 314 315 /* 316 * Reboot, halt and power_off stubs. They just call _machine_restart, 317 * _machine_halt or _machine_power_off. 318 */ 319 320void machine_restart(char *command) 321{ 322 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 323 /* 324 * Only unblank the console if we are called in enabled 325 * context or a bust_spinlocks cleared the way for us. 326 */ 327 console_unblank(); 328 _machine_restart(command); 329} 330 331void machine_halt(void) 332{ 333 if (!in_interrupt() || oops_in_progress) 334 /* 335 * Only unblank the console if we are called in enabled 336 * context or a bust_spinlocks cleared the way for us. 337 */ 338 console_unblank(); 339 _machine_halt(); 340} 341 342void machine_power_off(void) 343{ 344 if (!in_interrupt() || oops_in_progress) 345 /* 346 * Only unblank the console if we are called in enabled 347 * context or a bust_spinlocks cleared the way for us. 348 */ 349 console_unblank(); 350 _machine_power_off(); 351} 352 353/* 354 * Dummy power off function. 355 */ 356void (*pm_power_off)(void) = machine_power_off; 357EXPORT_SYMBOL_GPL(pm_power_off); 358 359void *restart_stack; 360 361unsigned long stack_alloc(void) 362{ 363#ifdef CONFIG_VMAP_STACK 364 void *ret; 365 366 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP, 367 NUMA_NO_NODE, __builtin_return_address(0)); 368 kmemleak_not_leak(ret); 369 return (unsigned long)ret; 370#else 371 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 372#endif 373} 374 375void stack_free(unsigned long stack) 376{ 377#ifdef CONFIG_VMAP_STACK 378 vfree((void *) stack); 379#else 380 free_pages(stack, THREAD_SIZE_ORDER); 381#endif 382} 383 384static unsigned long __init stack_alloc_early(void) 385{ 386 unsigned long stack; 387 388 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); 389 if (!stack) { 390 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 391 __func__, THREAD_SIZE, THREAD_SIZE); 392 } 393 return stack; 394} 395 396static void __init setup_lowcore(void) 397{ 398 struct lowcore *lc, *abs_lc; 399 400 /* 401 * Setup lowcore for boot cpu 402 */ 403 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 404 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 405 if (!lc) 406 panic("%s: Failed to allocate %zu bytes align=%zx\n", 407 __func__, sizeof(*lc), sizeof(*lc)); 408 409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT; 410 lc->restart_psw.addr = __pa(restart_int_handler); 411 lc->external_new_psw.mask = PSW_KERNEL_BITS; 412 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 413 lc->svc_new_psw.mask = PSW_KERNEL_BITS; 414 lc->svc_new_psw.addr = (unsigned long) system_call; 415 lc->program_new_psw.mask = PSW_KERNEL_BITS; 416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 419 lc->io_new_psw.mask = PSW_KERNEL_BITS; 420 lc->io_new_psw.addr = (unsigned long) io_int_handler; 421 lc->clock_comparator = clock_comparator_max; 422 lc->current_task = (unsigned long)&init_task; 423 lc->lpp = LPP_MAGIC; 424 lc->machine_flags = S390_lowcore.machine_flags; 425 lc->preempt_count = S390_lowcore.preempt_count; 426 nmi_alloc_mcesa_early(&lc->mcesad); 427 lc->sys_enter_timer = S390_lowcore.sys_enter_timer; 428 lc->exit_timer = S390_lowcore.exit_timer; 429 lc->user_timer = S390_lowcore.user_timer; 430 lc->system_timer = S390_lowcore.system_timer; 431 lc->steal_timer = S390_lowcore.steal_timer; 432 lc->last_update_timer = S390_lowcore.last_update_timer; 433 lc->last_update_clock = S390_lowcore.last_update_clock; 434 /* 435 * Allocate the global restart stack which is the same for 436 * all CPUs in case *one* of them does a PSW restart. 437 */ 438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET); 439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET; 440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET; 441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET; 442 lc->kernel_stack = S390_lowcore.kernel_stack; 443 /* 444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 445 * restart data to the absolute zero lowcore. This is necessary if 446 * PSW restart is done on an offline CPU that has lowcore zero. 447 */ 448 lc->restart_stack = (unsigned long) restart_stack; 449 lc->restart_fn = (unsigned long) do_restart; 450 lc->restart_data = 0; 451 lc->restart_source = -1U; 452 lc->spinlock_lockval = arch_spin_lockval(0); 453 lc->spinlock_index = 0; 454 arch_spin_lock_setup(0); 455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 457 lc->preempt_count = PREEMPT_DISABLED; 458 lc->kernel_asce = S390_lowcore.kernel_asce; 459 lc->user_asce = S390_lowcore.user_asce; 460 461 system_ctlreg_init_save_area(lc); 462 abs_lc = get_abs_lowcore(); 463 abs_lc->restart_stack = lc->restart_stack; 464 abs_lc->restart_fn = lc->restart_fn; 465 abs_lc->restart_data = lc->restart_data; 466 abs_lc->restart_source = lc->restart_source; 467 abs_lc->restart_psw = lc->restart_psw; 468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS; 469 abs_lc->program_new_psw = lc->program_new_psw; 470 abs_lc->mcesad = lc->mcesad; 471 put_abs_lowcore(abs_lc); 472 473 set_prefix(__pa(lc)); 474 lowcore_ptr[0] = lc; 475 if (abs_lowcore_map(0, lowcore_ptr[0], false)) 476 panic("Couldn't setup absolute lowcore"); 477} 478 479static struct resource code_resource = { 480 .name = "Kernel code", 481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 482}; 483 484static struct resource data_resource = { 485 .name = "Kernel data", 486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 487}; 488 489static struct resource bss_resource = { 490 .name = "Kernel bss", 491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 492}; 493 494static struct resource __initdata *standard_resources[] = { 495 &code_resource, 496 &data_resource, 497 &bss_resource, 498}; 499 500static void __init setup_resources(void) 501{ 502 struct resource *res, *std_res, *sub_res; 503 phys_addr_t start, end; 504 int j; 505 u64 i; 506 507 code_resource.start = __pa_symbol(_text); 508 code_resource.end = __pa_symbol(_etext) - 1; 509 data_resource.start = __pa_symbol(_etext); 510 data_resource.end = __pa_symbol(_edata) - 1; 511 bss_resource.start = __pa_symbol(__bss_start); 512 bss_resource.end = __pa_symbol(__bss_stop) - 1; 513 514 for_each_mem_range(i, &start, &end) { 515 res = memblock_alloc(sizeof(*res), 8); 516 if (!res) 517 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 518 __func__, sizeof(*res), 8); 519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 520 521 res->name = "System RAM"; 522 res->start = start; 523 /* 524 * In memblock, end points to the first byte after the 525 * range while in resources, end points to the last byte in 526 * the range. 527 */ 528 res->end = end - 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), 560 0, MEMBLOCK_NONE); 561 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 562 insert_resource(&iomem_resource, &crashk_res); 563 } 564#endif 565} 566 567static void __init setup_memory_end(void) 568{ 569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 571} 572 573#ifdef CONFIG_CRASH_DUMP 574 575/* 576 * When kdump is enabled, we have to ensure that no memory from the area 577 * [0 - crashkernel memory size] is set offline - it will be exchanged with 578 * the crashkernel memory region when kdump is triggered. The crashkernel 579 * memory region can never get offlined (pages are unmovable). 580 */ 581static int kdump_mem_notifier(struct notifier_block *nb, 582 unsigned long action, void *data) 583{ 584 struct memory_notify *arg = data; 585 586 if (action != MEM_GOING_OFFLINE) 587 return NOTIFY_OK; 588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 589 return NOTIFY_BAD; 590 return NOTIFY_OK; 591} 592 593static struct notifier_block kdump_mem_nb = { 594 .notifier_call = kdump_mem_notifier, 595}; 596 597#endif 598 599/* 600 * Reserve page tables created by decompressor 601 */ 602static void __init reserve_pgtables(void) 603{ 604 unsigned long start, end; 605 struct reserved_range *range; 606 607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end) 608 memblock_reserve(start, end - start); 609} 610 611/* 612 * Reserve memory for kdump kernel to be loaded with kexec 613 */ 614static void __init reserve_crashkernel(void) 615{ 616#ifdef CONFIG_CRASH_DUMP 617 unsigned long long crash_base, crash_size; 618 phys_addr_t low, high; 619 int rc; 620 621 rc = parse_crashkernel(boot_command_line, ident_map_size, 622 &crash_size, &crash_base, NULL, NULL); 623 624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 626 if (rc || crash_size == 0) 627 return; 628 629 if (memblock.memory.regions[0].size < crash_size) { 630 pr_info("crashkernel reservation failed: %s\n", 631 "first memory chunk must be at least crashkernel size"); 632 return; 633 } 634 635 low = crash_base ?: oldmem_data.start; 636 high = low + crash_size; 637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) { 638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 639 crash_base = low; 640 } else { 641 /* Find suitable area in free memory */ 642 low = max_t(unsigned long, crash_size, sclp.hsa_size); 643 high = crash_base ? crash_base + crash_size : ULONG_MAX; 644 645 if (crash_base && crash_base < low) { 646 pr_info("crashkernel reservation failed: %s\n", 647 "crash_base too low"); 648 return; 649 } 650 low = crash_base ?: low; 651 crash_base = memblock_phys_alloc_range(crash_size, 652 KEXEC_CRASH_MEM_ALIGN, 653 low, high); 654 } 655 656 if (!crash_base) { 657 pr_info("crashkernel reservation failed: %s\n", 658 "no suitable area found"); 659 return; 660 } 661 662 if (register_memory_notifier(&kdump_mem_nb)) { 663 memblock_phys_free(crash_base, crash_size); 664 return; 665 } 666 667 if (!oldmem_data.start && MACHINE_IS_VM) 668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 669 crashk_res.start = crash_base; 670 crashk_res.end = crash_base + crash_size - 1; 671 memblock_remove(crash_base, crash_size); 672 pr_info("Reserving %lluMB of memory at %lluMB " 673 "for crashkernel (System RAM: %luMB)\n", 674 crash_size >> 20, crash_base >> 20, 675 (unsigned long)memblock.memory.total_size >> 20); 676 os_info_crashkernel_add(crash_base, crash_size); 677#endif 678} 679 680/* 681 * Reserve the initrd from being used by memblock 682 */ 683static void __init reserve_initrd(void) 684{ 685 unsigned long addr, size; 686 687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size)) 688 return; 689 initrd_start = (unsigned long)__va(addr); 690 initrd_end = initrd_start + size; 691 memblock_reserve(addr, size); 692} 693 694/* 695 * Reserve the memory area used to pass the certificate lists 696 */ 697static void __init reserve_certificate_list(void) 698{ 699 if (ipl_cert_list_addr) 700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 701} 702 703static void __init reserve_physmem_info(void) 704{ 705 unsigned long addr, size; 706 707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size)) 708 memblock_reserve(addr, size); 709} 710 711static void __init free_physmem_info(void) 712{ 713 unsigned long addr, size; 714 715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size)) 716 memblock_phys_free(addr, size); 717} 718 719static void __init memblock_add_physmem_info(void) 720{ 721 unsigned long start, end; 722 int i; 723 724 pr_debug("physmem info source: %s (%hhd)\n", 725 get_physmem_info_source(), physmem_info.info_source); 726 /* keep memblock lists close to the kernel */ 727 memblock_set_bottom_up(true); 728 for_each_physmem_usable_range(i, &start, &end) 729 memblock_add(start, end - start); 730 for_each_physmem_online_range(i, &start, &end) 731 memblock_physmem_add(start, end - start); 732 memblock_set_bottom_up(false); 733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 734} 735 736/* 737 * Reserve memory used for lowcore/command line/kernel image. 738 */ 739static void __init reserve_kernel(void) 740{ 741 memblock_reserve(0, STARTUP_NORMAL_OFFSET); 742 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long)); 743 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long)); 744 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31); 745 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP); 746 memblock_reserve(__pa(_stext), _end - _stext); 747} 748 749static void __init setup_memory(void) 750{ 751 phys_addr_t start, end; 752 u64 i; 753 754 /* 755 * Init storage key for present memory 756 */ 757 for_each_mem_range(i, &start, &end) 758 storage_key_init_range(start, end); 759 760 psw_set_key(PAGE_DEFAULT_KEY); 761} 762 763static void __init relocate_amode31_section(void) 764{ 765 unsigned long amode31_size = __eamode31 - __samode31; 766 long amode31_offset, *ptr; 767 768 amode31_offset = physmem_info.reserved[RR_AMODE31].start - (unsigned long)__samode31; 769 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size); 770 771 /* Move original AMODE31 section to the new one */ 772 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size); 773 /* Zero out the old AMODE31 section to catch invalid accesses within it */ 774 memset(__samode31, 0, amode31_size); 775 776 /* Update all AMODE31 region references */ 777 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++) 778 *ptr += amode31_offset; 779} 780 781/* This must be called after AMODE31 relocation */ 782static void __init setup_cr(void) 783{ 784 union ctlreg2 cr2; 785 union ctlreg5 cr5; 786 union ctlreg15 cr15; 787 788 __ctl_duct[1] = (unsigned long)__ctl_aste; 789 __ctl_duct[2] = (unsigned long)__ctl_aste; 790 __ctl_duct[4] = (unsigned long)__ctl_duald; 791 792 /* Update control registers CR2, CR5 and CR15 */ 793 local_ctl_store(2, &cr2.reg); 794 local_ctl_store(5, &cr5.reg); 795 local_ctl_store(15, &cr15.reg); 796 cr2.ducto = (unsigned long)__ctl_duct >> 6; 797 cr5.pasteo = (unsigned long)__ctl_duct >> 6; 798 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3; 799 system_ctl_load(2, &cr2.reg); 800 system_ctl_load(5, &cr5.reg); 801 system_ctl_load(15, &cr15.reg); 802} 803 804/* 805 * Add system information as device randomness 806 */ 807static void __init setup_randomness(void) 808{ 809 struct sysinfo_3_2_2 *vmms; 810 811 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 812 if (!vmms) 813 panic("Failed to allocate memory for sysinfo structure\n"); 814 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 815 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 816 memblock_free(vmms, PAGE_SIZE); 817 818 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) 819 static_branch_enable(&s390_arch_random_available); 820} 821 822/* 823 * Issue diagnose 318 to set the control program name and 824 * version codes. 825 */ 826static void __init setup_control_program_code(void) 827{ 828 union diag318_info diag318_info = { 829 .cpnc = CPNC_LINUX, 830 .cpvc = 0, 831 }; 832 833 if (!sclp.has_diag318) 834 return; 835 836 diag_stat_inc(DIAG_STAT_X318); 837 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 838} 839 840/* 841 * Print the component list from the IPL report 842 */ 843static void __init log_component_list(void) 844{ 845 struct ipl_rb_component_entry *ptr, *end; 846 char *str; 847 848 if (!early_ipl_comp_list_addr) 849 return; 850 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 851 pr_info("Linux is running with Secure-IPL enabled\n"); 852 else 853 pr_info("Linux is running with Secure-IPL disabled\n"); 854 ptr = __va(early_ipl_comp_list_addr); 855 end = (void *) ptr + early_ipl_comp_list_size; 856 pr_info("The IPL report contains the following components:\n"); 857 while (ptr < end) { 858 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 859 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 860 str = "signed, verified"; 861 else 862 str = "signed, verification failed"; 863 } else { 864 str = "not signed"; 865 } 866 pr_info("%016llx - %016llx (%s)\n", 867 ptr->addr, ptr->addr + ptr->len, str); 868 ptr++; 869 } 870} 871 872/* 873 * Setup function called from init/main.c just after the banner 874 * was printed. 875 */ 876 877void __init setup_arch(char **cmdline_p) 878{ 879 /* 880 * print what head.S has found out about the machine 881 */ 882 if (MACHINE_IS_VM) 883 pr_info("Linux is running as a z/VM " 884 "guest operating system in 64-bit mode\n"); 885 else if (MACHINE_IS_KVM) 886 pr_info("Linux is running under KVM in 64-bit mode\n"); 887 else if (MACHINE_IS_LPAR) 888 pr_info("Linux is running natively in 64-bit mode\n"); 889 else 890 pr_info("Linux is running as a guest in 64-bit mode\n"); 891 892 log_component_list(); 893 894 /* Have one command line that is parsed and saved in /proc/cmdline */ 895 /* boot_command_line has been already set up in early.c */ 896 *cmdline_p = boot_command_line; 897 898 ROOT_DEV = Root_RAM0; 899 900 setup_initial_init_mm(_text, _etext, _edata, _end); 901 902 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 903 nospec_auto_detect(); 904 905 jump_label_init(); 906 parse_early_param(); 907#ifdef CONFIG_CRASH_DUMP 908 /* Deactivate elfcorehdr= kernel parameter */ 909 elfcorehdr_addr = ELFCORE_ADDR_MAX; 910#endif 911 912 os_info_init(); 913 setup_ipl(); 914 setup_control_program_code(); 915 916 /* Do some memory reservations *before* memory is added to memblock */ 917 reserve_pgtables(); 918 reserve_kernel(); 919 reserve_initrd(); 920 reserve_certificate_list(); 921 reserve_physmem_info(); 922 memblock_set_current_limit(ident_map_size); 923 memblock_allow_resize(); 924 925 /* Get information about *all* installed memory */ 926 memblock_add_physmem_info(); 927 928 free_physmem_info(); 929 setup_memory_end(); 930 memblock_dump_all(); 931 setup_memory(); 932 933 relocate_amode31_section(); 934 setup_cr(); 935 setup_uv(); 936 dma_contiguous_reserve(ident_map_size); 937 vmcp_cma_reserve(); 938 if (MACHINE_HAS_EDAT2) 939 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 940 941 reserve_crashkernel(); 942#ifdef CONFIG_CRASH_DUMP 943 /* 944 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset. 945 * Therefore CPU and device initialization should be done afterwards. 946 */ 947 smp_save_dump_secondary_cpus(); 948#endif 949 950 setup_resources(); 951 setup_lowcore(); 952 smp_fill_possible_mask(); 953 cpu_detect_mhz_feature(); 954 cpu_init(); 955 numa_setup(); 956 smp_detect_cpus(); 957 topology_init_early(); 958 959 if (test_facility(193)) 960 static_branch_enable(&cpu_has_bear); 961 962 /* 963 * Create kernel page tables. 964 */ 965 paging_init(); 966 967 /* 968 * After paging_init created the kernel page table, the new PSWs 969 * in lowcore can now run with DAT enabled. 970 */ 971#ifdef CONFIG_CRASH_DUMP 972 smp_save_dump_ipl_cpu(); 973#endif 974 975 /* Setup default console */ 976 conmode_default(); 977 set_preferred_console(); 978 979 apply_alternative_instructions(); 980 if (IS_ENABLED(CONFIG_EXPOLINE)) 981 nospec_init_branches(); 982 983 /* Setup zfcp/nvme dump support */ 984 setup_zfcpdump(); 985 986 /* Add system specific data to the random pool */ 987 setup_randomness(); 988} 989