arch/s390/kernel/setup.c

   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(vmalloc_size);
 103 unsigned long __bootdata(max_physmem_end);
 104 struct mem_detect_info __bootdata(mem_detect);
 105
 106 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
 107 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
 108 unsigned long __bootdata_preserved(__swsusp_reset_dma);
 109 unsigned long __bootdata_preserved(__stext_dma);
 110 unsigned long __bootdata_preserved(__etext_dma);
 111 unsigned long __bootdata_preserved(__sdma);
 112 unsigned long __bootdata_preserved(__edma);
 113 unsigned long __bootdata_preserved(__kaslr_offset);
 114
 115 unsigned long VMALLOC_START;
 116 EXPORT_SYMBOL(VMALLOC_START);
 117
 118 unsigned long VMALLOC_END;
 119 EXPORT_SYMBOL(VMALLOC_END);
 120
 121 struct page *vmemmap;
 122 EXPORT_SYMBOL(vmemmap);
 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  * This is set up by the setup-routine at boot-time
 133  * for S390 need to find out, what we have to setup
 134  * using address 0x10400 ...
 135  */
 136
 137 #include <asm/setup.h>
 138
 139 /*
 140  * condev= and conmode= setup parameter.
 141  */
 142
 143 static int __init condev_setup(char *str)
 144 {
 145         int vdev;
 146
 147         vdev = simple_strtoul(str, &str, 0);
 148         if (vdev >= 0 && vdev < 65536) {
 149                 console_devno = vdev;
 150                 console_irq = -1;
 151         }
 152         return 1;
 153 }
 154
 155 __setup("condev=", condev_setup);
 156
 157 static void __init set_preferred_console(void)
 158 {
 159         if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 160                 add_preferred_console("ttyS", 0, NULL);
 161         else if (CONSOLE_IS_3270)
 162                 add_preferred_console("tty3270", 0, NULL);
 163         else if (CONSOLE_IS_VT220)
 164                 add_preferred_console("ttyS", 1, NULL);
 165         else if (CONSOLE_IS_HVC)
 166                 add_preferred_console("hvc", 0, NULL);
 167 }
 168
 169 static int __init conmode_setup(char *str)
 170 {
 171 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 172         if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
 173                 SET_CONSOLE_SCLP;
 174 #endif
 175 #if defined(CONFIG_TN3215_CONSOLE)
 176         if (!strcmp(str, "3215"))
 177                 SET_CONSOLE_3215;
 178 #endif
 179 #if defined(CONFIG_TN3270_CONSOLE)
 180         if (!strcmp(str, "3270"))
 181                 SET_CONSOLE_3270;
 182 #endif
 183         set_preferred_console();
 184         return 1;
 185 }
 186
 187 __setup("conmode=", conmode_setup);
 188
 189 static void __init conmode_default(void)
 190 {
 191         char query_buffer[1024];
 192         char *ptr;
 193
 194         if (MACHINE_IS_VM) {
 195                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 196                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 197                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 198                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 199                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 200                 ptr = strstr(query_buffer, "CONMODE");
 201                 /*
 202                  * Set the conmode to 3215 so that the device recognition
 203                  * will set the cu_type of the console to 3215. If the
 204                  * conmode is 3270 and we don't set it back then both
 205                  * 3215 and the 3270 driver will try to access the console
 206                  * device (3215 as console and 3270 as normal tty).
 207                  */
 208                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 209                 if (ptr == NULL) {
 210 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 211                         SET_CONSOLE_SCLP;
 212 #endif
 213                         return;
 214                 }
 215                 if (str_has_prefix(ptr + 8, "3270")) {
 216 #if defined(CONFIG_TN3270_CONSOLE)
 217                         SET_CONSOLE_3270;
 218 #elif defined(CONFIG_TN3215_CONSOLE)
 219                         SET_CONSOLE_3215;
 220 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 221                         SET_CONSOLE_SCLP;
 222 #endif
 223                 } else if (str_has_prefix(ptr + 8, "3215")) {
 224 #if defined(CONFIG_TN3215_CONSOLE)
 225                         SET_CONSOLE_3215;
 226 #elif defined(CONFIG_TN3270_CONSOLE)
 227                         SET_CONSOLE_3270;
 228 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 229                         SET_CONSOLE_SCLP;
 230 #endif
 231                 }
 232         } else if (MACHINE_IS_KVM) {
 233                 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
 234                         SET_CONSOLE_VT220;
 235                 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
 236                         SET_CONSOLE_SCLP;
 237                 else
 238                         SET_CONSOLE_HVC;
 239         } else {
 240 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 241                 SET_CONSOLE_SCLP;
 242 #endif
 243         }
 244 }
 245
 246 #ifdef CONFIG_CRASH_DUMP
 247 static void __init setup_zfcpdump(void)
 248 {
 249         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 250                 return;
 251         if (OLDMEM_BASE)
 252                 return;
 253         strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
 254         console_loglevel = 2;
 255 }
 256 #else
 257 static inline void setup_zfcpdump(void) {}
 258 #endif /* CONFIG_CRASH_DUMP */
 259
 260  /*
 261  * Reboot, halt and power_off stubs. They just call _machine_restart,
 262  * _machine_halt or _machine_power_off.
 263  */
 264
 265 void machine_restart(char *command)
 266 {
 267         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 268                 /*
 269                  * Only unblank the console if we are called in enabled
 270                  * context or a bust_spinlocks cleared the way for us.
 271                  */
 272                 console_unblank();
 273         _machine_restart(command);
 274 }
 275
 276 void machine_halt(void)
 277 {
 278         if (!in_interrupt() || oops_in_progress)
 279                 /*
 280                  * Only unblank the console if we are called in enabled
 281                  * context or a bust_spinlocks cleared the way for us.
 282                  */
 283                 console_unblank();
 284         _machine_halt();
 285 }
 286
 287 void machine_power_off(void)
 288 {
 289         if (!in_interrupt() || oops_in_progress)
 290                 /*
 291                  * Only unblank the console if we are called in enabled
 292                  * context or a bust_spinlocks cleared the way for us.
 293                  */
 294                 console_unblank();
 295         _machine_power_off();
 296 }
 297
 298 /*
 299  * Dummy power off function.
 300  */
 301 void (*pm_power_off)(void) = machine_power_off;
 302 EXPORT_SYMBOL_GPL(pm_power_off);
 303
 304 void *restart_stack __section(.data);
 305
 306 unsigned long stack_alloc(void)
 307 {
 308 #ifdef CONFIG_VMAP_STACK
 309         return (unsigned long)
 310                 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
 311                                      VMALLOC_START, VMALLOC_END,
 312                                      THREADINFO_GFP,
 313                                      PAGE_KERNEL, 0, NUMA_NO_NODE,
 314                                      __builtin_return_address(0));
 315 #else
 316         return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
 317 #endif
 318 }
 319
 320 void stack_free(unsigned long stack)
 321 {
 322 #ifdef CONFIG_VMAP_STACK
 323         vfree((void *) stack);
 324 #else
 325         free_pages(stack, THREAD_SIZE_ORDER);
 326 #endif
 327 }
 328
 329 int __init arch_early_irq_init(void)
 330 {
 331         unsigned long stack;
 332
 333         stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
 334         if (!stack)
 335                 panic("Couldn't allocate async stack");
 336         S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
 337         return 0;
 338 }
 339
 340 static int __init async_stack_realloc(void)
 341 {
 342         unsigned long old, new;
 343
 344         old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
 345         new = stack_alloc();
 346         if (!new)
 347                 panic("Couldn't allocate async stack");
 348         S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
 349         free_pages(old, THREAD_SIZE_ORDER);
 350         return 0;
 351 }
 352 early_initcall(async_stack_realloc);
 353
 354 void __init arch_call_rest_init(void)
 355 {
 356         unsigned long stack;
 357
 358         stack = stack_alloc();
 359         if (!stack)
 360                 panic("Couldn't allocate kernel stack");
 361         current->stack = (void *) stack;
 362 #ifdef CONFIG_VMAP_STACK
 363         current->stack_vm_area = (void *) stack;
 364 #endif
 365         set_task_stack_end_magic(current);
 366         stack += STACK_INIT_OFFSET;
 367         S390_lowcore.kernel_stack = stack;
 368         CALL_ON_STACK_NORETURN(rest_init, stack);
 369 }
 370
 371 static void __init setup_lowcore_dat_off(void)
 372 {
 373         struct lowcore *lc;
 374
 375         /*
 376          * Setup lowcore for boot cpu
 377          */
 378         BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
 379         lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
 380         if (!lc)
 381                 panic("%s: Failed to allocate %zu bytes align=%zx\n",
 382                       __func__, sizeof(*lc), sizeof(*lc));
 383
 384         lc->restart_psw.mask = PSW_KERNEL_BITS;
 385         lc->restart_psw.addr = (unsigned long) restart_int_handler;
 386         lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 387         lc->external_new_psw.addr = (unsigned long) ext_int_handler;
 388         lc->svc_new_psw.mask = PSW_KERNEL_BITS |
 389                 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 390         lc->svc_new_psw.addr = (unsigned long) system_call;
 391         lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 392         lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
 393         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 394         lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
 395         lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 396         lc->io_new_psw.addr = (unsigned long) io_int_handler;
 397         lc->clock_comparator = clock_comparator_max;
 398         lc->nodat_stack = ((unsigned long) &init_thread_union)
 399                 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 400         lc->current_task = (unsigned long)&init_task;
 401         lc->lpp = LPP_MAGIC;
 402         lc->machine_flags = S390_lowcore.machine_flags;
 403         lc->preempt_count = S390_lowcore.preempt_count;
 404         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 405         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 406                sizeof(lc->stfle_fac_list));
 407         memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
 408                sizeof(lc->alt_stfle_fac_list));
 409         nmi_alloc_boot_cpu(lc);
 410         vdso_alloc_boot_cpu(lc);
 411         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 412         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 413         lc->exit_timer = S390_lowcore.exit_timer;
 414         lc->user_timer = S390_lowcore.user_timer;
 415         lc->system_timer = S390_lowcore.system_timer;
 416         lc->steal_timer = S390_lowcore.steal_timer;
 417         lc->last_update_timer = S390_lowcore.last_update_timer;
 418         lc->last_update_clock = S390_lowcore.last_update_clock;
 419
 420         /*
 421          * Allocate the global restart stack which is the same for
 422          * all CPUs in cast *one* of them does a PSW restart.
 423          */
 424         restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
 425         if (!restart_stack)
 426                 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 427                       __func__, THREAD_SIZE, THREAD_SIZE);
 428         restart_stack += STACK_INIT_OFFSET;
 429
 430         /*
 431          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 432          * restart data to the absolute zero lowcore. This is necessary if
 433          * PSW restart is done on an offline CPU that has lowcore zero.
 434          */
 435         lc->restart_stack = (unsigned long) restart_stack;
 436         lc->restart_fn = (unsigned long) do_restart;
 437         lc->restart_data = 0;
 438         lc->restart_source = -1UL;
 439
 440         /* Setup absolute zero lowcore */
 441         mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
 442         mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
 443         mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
 444         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
 445         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
 446
 447         lc->spinlock_lockval = arch_spin_lockval(0);
 448         lc->spinlock_index = 0;
 449         arch_spin_lock_setup(0);
 450         lc->br_r1_trampoline = 0x07f1;  /* br %r1 */
 451
 452         set_prefix((u32)(unsigned long) lc);
 453         lowcore_ptr[0] = lc;
 454 }
 455
 456 static void __init setup_lowcore_dat_on(void)
 457 {
 458         __ctl_clear_bit(0, 28);
 459         S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
 460         S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
 461         S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
 462         S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
 463         __ctl_set_bit(0, 28);
 464 }
 465
 466 static struct resource code_resource = {
 467         .name  = "Kernel code",
 468         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 469 };
 470
 471 static struct resource data_resource = {
 472         .name = "Kernel data",
 473         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 474 };
 475
 476 static struct resource bss_resource = {
 477         .name = "Kernel bss",
 478         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 479 };
 480
 481 static struct resource __initdata *standard_resources[] = {
 482         &code_resource,
 483         &data_resource,
 484         &bss_resource,
 485 };
 486
 487 static void __init setup_resources(void)
 488 {
 489         struct resource *res, *std_res, *sub_res;
 490         struct memblock_region *reg;
 491         int j;
 492
 493         code_resource.start = (unsigned long) _text;
 494         code_resource.end = (unsigned long) _etext - 1;
 495         data_resource.start = (unsigned long) _etext;
 496         data_resource.end = (unsigned long) _edata - 1;
 497         bss_resource.start = (unsigned long) __bss_start;
 498         bss_resource.end = (unsigned long) __bss_stop - 1;
 499
 500         for_each_memblock(memory, reg) {
 501                 res = memblock_alloc(sizeof(*res), 8);
 502                 if (!res)
 503                         panic("%s: Failed to allocate %zu bytes align=0x%x\n",
 504                               __func__, sizeof(*res), 8);
 505                 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
 506
 507                 res->name = "System RAM";
 508                 res->start = reg->base;
 509                 res->end = reg->base + reg->size - 1;
 510                 request_resource(&iomem_resource, res);
 511
 512                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 513                         std_res = standard_resources[j];
 514                         if (std_res->start < res->start ||
 515                             std_res->start > res->end)
 516                                 continue;
 517                         if (std_res->end > res->end) {
 518                                 sub_res = memblock_alloc(sizeof(*sub_res), 8);
 519                                 if (!sub_res)
 520                                         panic("%s: Failed to allocate %zu bytes align=0x%x\n",
 521                                               __func__, sizeof(*sub_res), 8);
 522                                 *sub_res = *std_res;
 523                                 sub_res->end = res->end;
 524                                 std_res->start = res->end + 1;
 525                                 request_resource(res, sub_res);
 526                         } else {
 527                                 request_resource(res, std_res);
 528                         }
 529                 }
 530         }
 531 #ifdef CONFIG_CRASH_DUMP
 532         /*
 533          * Re-add removed crash kernel memory as reserved memory. This makes
 534          * sure it will be mapped with the identity mapping and struct pages
 535          * will be created, so it can be resized later on.
 536          * However add it later since the crash kernel resource should not be
 537          * part of the System RAM resource.
 538          */
 539         if (crashk_res.end) {
 540                 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
 541                 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
 542                 insert_resource(&iomem_resource, &crashk_res);
 543         }
 544 #endif
 545 }
 546
 547 static void __init setup_memory_end(void)
 548 {
 549         unsigned long vmax, tmp;
 550
 551         /* Choose kernel address space layout: 3 or 4 levels. */
 552         if (IS_ENABLED(CONFIG_KASAN)) {
 553                 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
 554                            ? _REGION1_SIZE
 555                            : _REGION2_SIZE;
 556         } else {
 557                 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
 558                 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
 559                 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
 560                         vmax = _REGION2_SIZE; /* 3-level kernel page table */
 561                 else
 562                         vmax = _REGION1_SIZE; /* 4-level kernel page table */
 563         }
 564
 565         /* module area is at the end of the kernel address space. */
 566         MODULES_END = vmax;
 567         MODULES_VADDR = MODULES_END - MODULES_LEN;
 568         VMALLOC_END = MODULES_VADDR;
 569         VMALLOC_START = VMALLOC_END - vmalloc_size;
 570
 571         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
 572         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
 573         /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
 574         tmp = SECTION_ALIGN_UP(tmp);
 575         tmp = VMALLOC_START - tmp * sizeof(struct page);
 576         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
 577         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
 578         vmemmap = (struct page *) tmp;
 579
 580         /* Take care that memory_end is set and <= vmemmap */
 581         memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
 582 #ifdef CONFIG_KASAN
 583         /* fit in kasan shadow memory region between 1:1 and vmemmap */
 584         memory_end = min(memory_end, KASAN_SHADOW_START);
 585         vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
 586 #endif
 587         max_pfn = max_low_pfn = PFN_DOWN(memory_end);
 588         memblock_remove(memory_end, ULONG_MAX);
 589
 590         pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
 591 }
 592
 593 #ifdef CONFIG_CRASH_DUMP
 594
 595 /*
 596  * When kdump is enabled, we have to ensure that no memory from
 597  * the area [0 - crashkernel memory size] and
 598  * [crashk_res.start - crashk_res.end] is set offline.
 599  */
 600 static int kdump_mem_notifier(struct notifier_block *nb,
 601                               unsigned long action, void *data)
 602 {
 603         struct memory_notify *arg = data;
 604
 605         if (action != MEM_GOING_OFFLINE)
 606                 return NOTIFY_OK;
 607         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 608                 return NOTIFY_BAD;
 609         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
 610                 return NOTIFY_OK;
 611         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
 612                 return NOTIFY_OK;
 613         return NOTIFY_BAD;
 614 }
 615
 616 static struct notifier_block kdump_mem_nb = {
 617         .notifier_call = kdump_mem_notifier,
 618 };
 619
 620 #endif
 621
 622 /*
 623  * Make sure that the area behind memory_end is protected
 624  */
 625 static void reserve_memory_end(void)
 626 {
 627         if (memory_end_set)
 628                 memblock_reserve(memory_end, ULONG_MAX);
 629 }
 630
 631 /*
 632  * Make sure that oldmem, where the dump is stored, is protected
 633  */
 634 static void reserve_oldmem(void)
 635 {
 636 #ifdef CONFIG_CRASH_DUMP
 637         if (OLDMEM_BASE)
 638                 /* Forget all memory above the running kdump system */
 639                 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
 640 #endif
 641 }
 642
 643 /*
 644  * Make sure that oldmem, where the dump is stored, is protected
 645  */
 646 static void remove_oldmem(void)
 647 {
 648 #ifdef CONFIG_CRASH_DUMP
 649         if (OLDMEM_BASE)
 650                 /* Forget all memory above the running kdump system */
 651                 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
 652 #endif
 653 }
 654
 655 /*
 656  * Reserve memory for kdump kernel to be loaded with kexec
 657  */
 658 static void __init reserve_crashkernel(void)
 659 {
 660 #ifdef CONFIG_CRASH_DUMP
 661         unsigned long long crash_base, crash_size;
 662         phys_addr_t low, high;
 663         int rc;
 664
 665         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 666                                &crash_base);
 667
 668         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 669         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 670         if (rc || crash_size == 0)
 671                 return;
 672
 673         if (memblock.memory.regions[0].size < crash_size) {
 674                 pr_info("crashkernel reservation failed: %s\n",
 675                         "first memory chunk must be at least crashkernel size");
 676                 return;
 677         }
 678
 679         low = crash_base ?: OLDMEM_BASE;
 680         high = low + crash_size;
 681         if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
 682                 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
 683                 crash_base = low;
 684         } else {
 685                 /* Find suitable area in free memory */
 686                 low = max_t(unsigned long, crash_size, sclp.hsa_size);
 687                 high = crash_base ? crash_base + crash_size : ULONG_MAX;
 688
 689                 if (crash_base && crash_base < low) {
 690                         pr_info("crashkernel reservation failed: %s\n",
 691                                 "crash_base too low");
 692                         return;
 693                 }
 694                 low = crash_base ?: low;
 695                 crash_base = memblock_find_in_range(low, high, crash_size,
 696                                                     KEXEC_CRASH_MEM_ALIGN);
 697         }
 698
 699         if (!crash_base) {
 700                 pr_info("crashkernel reservation failed: %s\n",
 701                         "no suitable area found");
 702                 return;
 703         }
 704
 705         if (register_memory_notifier(&kdump_mem_nb))
 706                 return;
 707
 708         if (!OLDMEM_BASE && MACHINE_IS_VM)
 709                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
 710         crashk_res.start = crash_base;
 711         crashk_res.end = crash_base + crash_size - 1;
 712         memblock_remove(crash_base, crash_size);
 713         pr_info("Reserving %lluMB of memory at %lluMB "
 714                 "for crashkernel (System RAM: %luMB)\n",
 715                 crash_size >> 20, crash_base >> 20,
 716                 (unsigned long)memblock.memory.total_size >> 20);
 717         os_info_crashkernel_add(crash_base, crash_size);
 718 #endif
 719 }
 720
 721 /*
 722  * Reserve the initrd from being used by memblock
 723  */
 724 static void __init reserve_initrd(void)
 725 {
 726 #ifdef CONFIG_BLK_DEV_INITRD
 727         if (!INITRD_START || !INITRD_SIZE)
 728                 return;
 729         initrd_start = INITRD_START;
 730         initrd_end = initrd_start + INITRD_SIZE;
 731         memblock_reserve(INITRD_START, INITRD_SIZE);
 732 #endif
 733 }
 734
 735 /*
 736  * Reserve the memory area used to pass the certificate lists
 737  */
 738 static void __init reserve_certificate_list(void)
 739 {
 740         if (ipl_cert_list_addr)
 741                 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
 742 }
 743
 744 static void __init reserve_mem_detect_info(void)
 745 {
 746         unsigned long start, size;
 747
 748         get_mem_detect_reserved(&start, &size);
 749         if (size)
 750                 memblock_reserve(start, size);
 751 }
 752
 753 static void __init free_mem_detect_info(void)
 754 {
 755         unsigned long start, size;
 756
 757         get_mem_detect_reserved(&start, &size);
 758         if (size)
 759                 memblock_free(start, size);
 760 }
 761
 762 static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
 763 {
 764         memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
 765                      start, start + size - 1);
 766         memblock_add_range(&memblock.memory, start, size, 0, 0);
 767         memblock_add_range(&memblock.physmem, start, size, 0, 0);
 768 }
 769
 770 static const char * __init get_mem_info_source(void)
 771 {
 772         switch (mem_detect.info_source) {
 773         case MEM_DETECT_SCLP_STOR_INFO:
 774                 return "sclp storage info";
 775         case MEM_DETECT_DIAG260:
 776                 return "diag260";
 777         case MEM_DETECT_SCLP_READ_INFO:
 778                 return "sclp read info";
 779         case MEM_DETECT_BIN_SEARCH:
 780                 return "binary search";
 781         }
 782         return "none";
 783 }
 784
 785 static void __init memblock_add_mem_detect_info(void)
 786 {
 787         unsigned long start, end;
 788         int i;
 789
 790         memblock_dbg("physmem info source: %s (%hhd)\n",
 791                      get_mem_info_source(), mem_detect.info_source);
 792         /* keep memblock lists close to the kernel */
 793         memblock_set_bottom_up(true);
 794         for_each_mem_detect_block(i, &start, &end)
 795                 memblock_physmem_add(start, end - start);
 796         memblock_set_bottom_up(false);
 797         memblock_dump_all();
 798 }
 799
 800 /*
 801  * Check for initrd being in usable memory
 802  */
 803 static void __init check_initrd(void)
 804 {
 805 #ifdef CONFIG_BLK_DEV_INITRD
 806         if (INITRD_START && INITRD_SIZE &&
 807             !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
 808                 pr_err("The initial RAM disk does not fit into the memory\n");
 809                 memblock_free(INITRD_START, INITRD_SIZE);
 810                 initrd_start = initrd_end = 0;
 811         }
 812 #endif
 813 }
 814
 815 /*
 816  * Reserve memory used for lowcore/command line/kernel image.
 817  */
 818 static void __init reserve_kernel(void)
 819 {
 820         unsigned long start_pfn = PFN_UP(__pa(_end));
 821
 822         memblock_reserve(0, HEAD_END);
 823         memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
 824                          - (unsigned long)_stext);
 825         memblock_reserve(__sdma, __edma - __sdma);
 826 }
 827
 828 static void __init setup_memory(void)
 829 {
 830         struct memblock_region *reg;
 831
 832         /*
 833          * Init storage key for present memory
 834          */
 835         for_each_memblock(memory, reg) {
 836                 storage_key_init_range(reg->base, reg->base + reg->size);
 837         }
 838         psw_set_key(PAGE_DEFAULT_KEY);
 839
 840         /* Only cosmetics */
 841         memblock_enforce_memory_limit(memblock_end_of_DRAM());
 842 }
 843
 844 /*
 845  * Setup hardware capabilities.
 846  */
 847 static int __init setup_hwcaps(void)
 848 {
 849         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 850         struct cpuid cpu_id;
 851         int i;
 852
 853         /*
 854          * The store facility list bits numbers as found in the principles
 855          * of operation are numbered with bit 1UL<<31 as number 0 to
 856          * bit 1UL<<0 as number 31.
 857          *   Bit 0: instructions named N3, "backported" to esa-mode
 858          *   Bit 2: z/Architecture mode is active
 859          *   Bit 7: the store-facility-list-extended facility is installed
 860          *   Bit 17: the message-security assist is installed
 861          *   Bit 19: the long-displacement facility is installed
 862          *   Bit 21: the extended-immediate facility is installed
 863          *   Bit 22: extended-translation facility 3 is installed
 864          *   Bit 30: extended-translation facility 3 enhancement facility
 865          * These get translated to:
 866          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 867          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 868          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 869          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 870          */
 871         for (i = 0; i < 6; i++)
 872                 if (test_facility(stfl_bits[i]))
 873                         elf_hwcap |= 1UL << i;
 874
 875         if (test_facility(22) && test_facility(30))
 876                 elf_hwcap |= HWCAP_S390_ETF3EH;
 877
 878         /*
 879          * Check for additional facilities with store-facility-list-extended.
 880          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 881          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 882          * as stored by stfl, bits 32-xxx contain additional facilities.
 883          * How many facility words are stored depends on the number of
 884          * doublewords passed to the instruction. The additional facilities
 885          * are:
 886          *   Bit 42: decimal floating point facility is installed
 887          *   Bit 44: perform floating point operation facility is installed
 888          * translated to:
 889          *   HWCAP_S390_DFP bit 6 (42 && 44).
 890          */
 891         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 892                 elf_hwcap |= HWCAP_S390_DFP;
 893
 894         /*
 895          * Huge page support HWCAP_S390_HPAGE is bit 7.
 896          */
 897         if (MACHINE_HAS_EDAT1)
 898                 elf_hwcap |= HWCAP_S390_HPAGE;
 899
 900         /*
 901          * 64-bit register support for 31-bit processes
 902          * HWCAP_S390_HIGH_GPRS is bit 9.
 903          */
 904         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 905
 906         /*
 907          * Transactional execution support HWCAP_S390_TE is bit 10.
 908          */
 909         if (MACHINE_HAS_TE)
 910                 elf_hwcap |= HWCAP_S390_TE;
 911
 912         /*
 913          * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
 914          * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
 915          * instead of facility bit 129.
 916          */
 917         if (MACHINE_HAS_VX) {
 918                 elf_hwcap |= HWCAP_S390_VXRS;
 919                 if (test_facility(134))
 920                         elf_hwcap |= HWCAP_S390_VXRS_EXT;
 921                 if (test_facility(135))
 922                         elf_hwcap |= HWCAP_S390_VXRS_BCD;
 923                 if (test_facility(148))
 924                         elf_hwcap |= HWCAP_S390_VXRS_EXT2;
 925                 if (test_facility(152))
 926                         elf_hwcap |= HWCAP_S390_VXRS_PDE;
 927         }
 928         if (test_facility(150))
 929                 elf_hwcap |= HWCAP_S390_SORT;
 930         if (test_facility(151))
 931                 elf_hwcap |= HWCAP_S390_DFLT;
 932
 933         /*
 934          * Guarded storage support HWCAP_S390_GS is bit 12.
 935          */
 936         if (MACHINE_HAS_GS)
 937                 elf_hwcap |= HWCAP_S390_GS;
 938
 939         get_cpu_id(&cpu_id);
 940         add_device_randomness(&cpu_id, sizeof(cpu_id));
 941         switch (cpu_id.machine) {
 942         case 0x2064:
 943         case 0x2066:
 944         default:        /* Use "z900" as default for 64 bit kernels. */
 945                 strcpy(elf_platform, "z900");
 946                 break;
 947         case 0x2084:
 948         case 0x2086:
 949                 strcpy(elf_platform, "z990");
 950                 break;
 951         case 0x2094:
 952         case 0x2096:
 953                 strcpy(elf_platform, "z9-109");
 954                 break;
 955         case 0x2097:
 956         case 0x2098:
 957                 strcpy(elf_platform, "z10");
 958                 break;
 959         case 0x2817:
 960         case 0x2818:
 961                 strcpy(elf_platform, "z196");
 962                 break;
 963         case 0x2827:
 964         case 0x2828:
 965                 strcpy(elf_platform, "zEC12");
 966                 break;
 967         case 0x2964:
 968         case 0x2965:
 969                 strcpy(elf_platform, "z13");
 970                 break;
 971         case 0x3906:
 972         case 0x3907:
 973                 strcpy(elf_platform, "z14");
 974                 break;
 975         case 0x8561:
 976         case 0x8562:
 977                 strcpy(elf_platform, "z15");
 978                 break;
 979         }
 980
 981         /*
 982          * Virtualization support HWCAP_INT_SIE is bit 0.
 983          */
 984         if (sclp.has_sief2)
 985                 int_hwcap |= HWCAP_INT_SIE;
 986
 987         return 0;
 988 }
 989 arch_initcall(setup_hwcaps);
 990
 991 /*
 992  * Add system information as device randomness
 993  */
 994 static void __init setup_randomness(void)
 995 {
 996         struct sysinfo_3_2_2 *vmms;
 997
 998         vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
 999                                                             PAGE_SIZE);
1000         if (!vmms)
1001                 panic("Failed to allocate memory for sysinfo structure\n");
1002
1003         if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
1004                 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
1005         memblock_free((unsigned long) vmms, PAGE_SIZE);
1006 }
1007
1008 /*
1009  * Find the correct size for the task_struct. This depends on
1010  * the size of the struct fpu at the end of the thread_struct
1011  * which is embedded in the task_struct.
1012  */
1013 static void __init setup_task_size(void)
1014 {
1015         int task_size = sizeof(struct task_struct);
1016
1017         if (!MACHINE_HAS_VX) {
1018                 task_size -= sizeof(__vector128) * __NUM_VXRS;
1019                 task_size += sizeof(freg_t) * __NUM_FPRS;
1020         }
1021         arch_task_struct_size = task_size;
1022 }
1023
1024 /*
1025  * Issue diagnose 318 to set the control program name and
1026  * version codes.
1027  */
1028 static void __init setup_control_program_code(void)
1029 {
1030         union diag318_info diag318_info = {
1031                 .cpnc = CPNC_LINUX,
1032                 .cpvc_linux = 0,
1033                 .cpvc_distro = {0},
1034         };
1035
1036         if (!sclp.has_diag318)
1037                 return;
1038
1039         diag_stat_inc(DIAG_STAT_X318);
1040         asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1041 }
1042
1043 /*
1044  * Print the component list from the IPL report
1045  */
1046 static void __init log_component_list(void)
1047 {
1048         struct ipl_rb_component_entry *ptr, *end;
1049         char *str;
1050
1051         if (!early_ipl_comp_list_addr)
1052                 return;
1053         if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
1054                 pr_info("Linux is running with Secure-IPL enabled\n");
1055         else
1056                 pr_info("Linux is running with Secure-IPL disabled\n");
1057         ptr = (void *) early_ipl_comp_list_addr;
1058         end = (void *) ptr + early_ipl_comp_list_size;
1059         pr_info("The IPL report contains the following components:\n");
1060         while (ptr < end) {
1061                 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1062                         if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1063                                 str = "signed, verified";
1064                         else
1065                                 str = "signed, verification failed";
1066                 } else {
1067                         str = "not signed";
1068                 }
1069                 pr_info("%016llx - %016llx (%s)\n",
1070                         ptr->addr, ptr->addr + ptr->len, str);
1071                 ptr++;
1072         }
1073 }
1074
1075 /*
1076  * Setup function called from init/main.c just after the banner
1077  * was printed.
1078  */
1079
1080 void __init setup_arch(char **cmdline_p)
1081 {
1082         /*
1083          * print what head.S has found out about the machine
1084          */
1085         if (MACHINE_IS_VM)
1086                 pr_info("Linux is running as a z/VM "
1087                         "guest operating system in 64-bit mode\n");
1088         else if (MACHINE_IS_KVM)
1089                 pr_info("Linux is running under KVM in 64-bit mode\n");
1090         else if (MACHINE_IS_LPAR)
1091                 pr_info("Linux is running natively in 64-bit mode\n");
1092         else
1093                 pr_info("Linux is running as a guest in 64-bit mode\n");
1094
1095         log_component_list();
1096
1097         /* Have one command line that is parsed and saved in /proc/cmdline */
1098         /* boot_command_line has been already set up in early.c */
1099         *cmdline_p = boot_command_line;
1100
1101         ROOT_DEV = Root_RAM0;
1102
1103         init_mm.start_code = (unsigned long) _text;
1104         init_mm.end_code = (unsigned long) _etext;
1105         init_mm.end_data = (unsigned long) _edata;
1106         init_mm.brk = (unsigned long) _end;
1107
1108         if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1109                 nospec_auto_detect();
1110
1111         parse_early_param();
1112 #ifdef CONFIG_CRASH_DUMP
1113         /* Deactivate elfcorehdr= kernel parameter */
1114         elfcorehdr_addr = ELFCORE_ADDR_MAX;
1115 #endif
1116
1117         os_info_init();
1118         setup_ipl();
1119         setup_task_size();
1120         setup_control_program_code();
1121
1122         /* Do some memory reservations *before* memory is added to memblock */
1123         reserve_memory_end();
1124         reserve_oldmem();
1125         reserve_kernel();
1126         reserve_initrd();
1127         reserve_certificate_list();
1128         reserve_mem_detect_info();
1129         memblock_allow_resize();
1130
1131         /* Get information about *all* installed memory */
1132         memblock_add_mem_detect_info();
1133
1134         free_mem_detect_info();
1135         remove_oldmem();
1136
1137         /*
1138          * Make sure all chunks are MAX_ORDER aligned so we don't need the
1139          * extra checks that HOLES_IN_ZONE would require.
1140          *
1141          * Is this still required?
1142          */
1143         memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
1144
1145         setup_memory_end();
1146         setup_memory();
1147         dma_contiguous_reserve(memory_end);
1148         vmcp_cma_reserve();
1149
1150         check_initrd();
1151         reserve_crashkernel();
1152 #ifdef CONFIG_CRASH_DUMP
1153         /*
1154          * Be aware that smp_save_dump_cpus() triggers a system reset.
1155          * Therefore CPU and device initialization should be done afterwards.
1156          */
1157         smp_save_dump_cpus();
1158 #endif
1159
1160         setup_resources();
1161         setup_lowcore_dat_off();
1162         smp_fill_possible_mask();
1163         cpu_detect_mhz_feature();
1164         cpu_init();
1165         numa_setup();
1166         smp_detect_cpus();
1167         topology_init_early();
1168
1169         /*
1170          * Create kernel page tables and switch to virtual addressing.
1171          */
1172         paging_init();
1173
1174         /*
1175          * After paging_init created the kernel page table, the new PSWs
1176          * in lowcore can now run with DAT enabled.
1177          */
1178         setup_lowcore_dat_on();
1179
1180         /* Setup default console */
1181         conmode_default();
1182         set_preferred_console();
1183
1184         apply_alternative_instructions();
1185         if (IS_ENABLED(CONFIG_EXPOLINE))
1186                 nospec_init_branches();
1187
1188         /* Setup zfcpdump support */
1189         setup_zfcpdump();
1190
1191         /* Add system specific data to the random pool */
1192         setup_randomness();
1193 }