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 <asm/asm-offsets.h>
  77 #include "entry.h"
  78
  79 /*
  80  * Machine setup..
  81  */
  82 unsigned int console_mode = 0;
  83 EXPORT_SYMBOL(console_mode);
  84
  85 unsigned int console_devno = -1;
  86 EXPORT_SYMBOL(console_devno);
  87
  88 unsigned int console_irq = -1;
  89 EXPORT_SYMBOL(console_irq);
  90
  91 unsigned long elf_hwcap __read_mostly = 0;
  92 char elf_platform[ELF_PLATFORM_SIZE];
  93
  94 unsigned long int_hwcap = 0;
  95
  96 int __bootdata(noexec_disabled);
  97 int __bootdata(memory_end_set);
  98 unsigned long __bootdata(memory_end);
  99 unsigned long __bootdata(vmalloc_size);
 100 unsigned long __bootdata(max_physmem_end);
 101 struct mem_detect_info __bootdata(mem_detect);
 102
 103 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
 104 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
 105 unsigned long __bootdata_preserved(__swsusp_reset_dma);
 106 unsigned long __bootdata_preserved(__stext_dma);
 107 unsigned long __bootdata_preserved(__etext_dma);
 108 unsigned long __bootdata_preserved(__sdma);
 109 unsigned long __bootdata_preserved(__edma);
 110 unsigned long __bootdata_preserved(__kaslr_offset);
 111 unsigned int __bootdata_preserved(zlib_dfltcc_support);
 112 EXPORT_SYMBOL(zlib_dfltcc_support);
 113
 114 unsigned long VMALLOC_START;
 115 EXPORT_SYMBOL(VMALLOC_START);
 116
 117 unsigned long VMALLOC_END;
 118 EXPORT_SYMBOL(VMALLOC_END);
 119
 120 struct page *vmemmap;
 121 EXPORT_SYMBOL(vmemmap);
 122
 123 unsigned long MODULES_VADDR;
 124 unsigned long MODULES_END;
 125
 126 /* An array with a pointer to the lowcore of every CPU. */
 127 struct lowcore *lowcore_ptr[NR_CPUS];
 128 EXPORT_SYMBOL(lowcore_ptr);
 129
 130 /*
 131  * This is set up by the setup-routine at boot-time
 132  * for S390 need to find out, what we have to setup
 133  * using address 0x10400 ...
 134  */
 135
 136 #include <asm/setup.h>
 137
 138 /*
 139  * condev= and conmode= setup parameter.
 140  */
 141
 142 static int __init condev_setup(char *str)
 143 {
 144         int vdev;
 145
 146         vdev = simple_strtoul(str, &str, 0);
 147         if (vdev >= 0 && vdev < 65536) {
 148                 console_devno = vdev;
 149                 console_irq = -1;
 150         }
 151         return 1;
 152 }
 153
 154 __setup("condev=", condev_setup);
 155
 156 static void __init set_preferred_console(void)
 157 {
 158         if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 159                 add_preferred_console("ttyS", 0, NULL);
 160         else if (CONSOLE_IS_3270)
 161                 add_preferred_console("tty3270", 0, NULL);
 162         else if (CONSOLE_IS_VT220)
 163                 add_preferred_console("ttyS", 1, NULL);
 164         else if (CONSOLE_IS_HVC)
 165                 add_preferred_console("hvc", 0, NULL);
 166 }
 167
 168 static int __init conmode_setup(char *str)
 169 {
 170 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 171         if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
 172                 SET_CONSOLE_SCLP;
 173 #endif
 174 #if defined(CONFIG_TN3215_CONSOLE)
 175         if (!strcmp(str, "3215"))
 176                 SET_CONSOLE_3215;
 177 #endif
 178 #if defined(CONFIG_TN3270_CONSOLE)
 179         if (!strcmp(str, "3270"))
 180                 SET_CONSOLE_3270;
 181 #endif
 182         set_preferred_console();
 183         return 1;
 184 }
 185
 186 __setup("conmode=", conmode_setup);
 187
 188 static void __init conmode_default(void)
 189 {
 190         char query_buffer[1024];
 191         char *ptr;
 192
 193         if (MACHINE_IS_VM) {
 194                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 195                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 196                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 197                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 198                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 199                 ptr = strstr(query_buffer, "CONMODE");
 200                 /*
 201                  * Set the conmode to 3215 so that the device recognition
 202                  * will set the cu_type of the console to 3215. If the
 203                  * conmode is 3270 and we don't set it back then both
 204                  * 3215 and the 3270 driver will try to access the console
 205                  * device (3215 as console and 3270 as normal tty).
 206                  */
 207                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 208                 if (ptr == NULL) {
 209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 210                         SET_CONSOLE_SCLP;
 211 #endif
 212                         return;
 213                 }
 214                 if (str_has_prefix(ptr + 8, "3270")) {
 215 #if defined(CONFIG_TN3270_CONSOLE)
 216                         SET_CONSOLE_3270;
 217 #elif defined(CONFIG_TN3215_CONSOLE)
 218                         SET_CONSOLE_3215;
 219 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 220                         SET_CONSOLE_SCLP;
 221 #endif
 222                 } else if (str_has_prefix(ptr + 8, "3215")) {
 223 #if defined(CONFIG_TN3215_CONSOLE)
 224                         SET_CONSOLE_3215;
 225 #elif defined(CONFIG_TN3270_CONSOLE)
 226                         SET_CONSOLE_3270;
 227 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 228                         SET_CONSOLE_SCLP;
 229 #endif
 230                 }
 231         } else if (MACHINE_IS_KVM) {
 232                 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
 233                         SET_CONSOLE_VT220;
 234                 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
 235                         SET_CONSOLE_SCLP;
 236                 else
 237                         SET_CONSOLE_HVC;
 238         } else {
 239 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 240                 SET_CONSOLE_SCLP;
 241 #endif
 242         }
 243 }
 244
 245 #ifdef CONFIG_CRASH_DUMP
 246 static void __init setup_zfcpdump(void)
 247 {
 248         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 249                 return;
 250         if (OLDMEM_BASE)
 251                 return;
 252         strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
 253         console_loglevel = 2;
 254 }
 255 #else
 256 static inline void setup_zfcpdump(void) {}
 257 #endif /* CONFIG_CRASH_DUMP */
 258
 259  /*
 260  * Reboot, halt and power_off stubs. They just call _machine_restart,
 261  * _machine_halt or _machine_power_off.
 262  */
 263
 264 void machine_restart(char *command)
 265 {
 266         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 267                 /*
 268                  * Only unblank the console if we are called in enabled
 269                  * context or a bust_spinlocks cleared the way for us.
 270                  */
 271                 console_unblank();
 272         _machine_restart(command);
 273 }
 274
 275 void machine_halt(void)
 276 {
 277         if (!in_interrupt() || oops_in_progress)
 278                 /*
 279                  * Only unblank the console if we are called in enabled
 280                  * context or a bust_spinlocks cleared the way for us.
 281                  */
 282                 console_unblank();
 283         _machine_halt();
 284 }
 285
 286 void machine_power_off(void)
 287 {
 288         if (!in_interrupt() || oops_in_progress)
 289                 /*
 290                  * Only unblank the console if we are called in enabled
 291                  * context or a bust_spinlocks cleared the way for us.
 292                  */
 293                 console_unblank();
 294         _machine_power_off();
 295 }
 296
 297 /*
 298  * Dummy power off function.
 299  */
 300 void (*pm_power_off)(void) = machine_power_off;
 301 EXPORT_SYMBOL_GPL(pm_power_off);
 302
 303 void *restart_stack __section(.data);
 304
 305 unsigned long stack_alloc(void)
 306 {
 307 #ifdef CONFIG_VMAP_STACK
 308         return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE,
 309                         THREADINFO_GFP, NUMA_NO_NODE,
 310                         __builtin_return_address(0));
 311 #else
 312         return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
 313 #endif
 314 }
 315
 316 void stack_free(unsigned long stack)
 317 {
 318 #ifdef CONFIG_VMAP_STACK
 319         vfree((void *) stack);
 320 #else
 321         free_pages(stack, THREAD_SIZE_ORDER);
 322 #endif
 323 }
 324
 325 int __init arch_early_irq_init(void)
 326 {
 327         unsigned long stack;
 328
 329         stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
 330         if (!stack)
 331                 panic("Couldn't allocate async stack");
 332         S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
 333         return 0;
 334 }
 335
 336 static int __init async_stack_realloc(void)
 337 {
 338         unsigned long old, new;
 339
 340         old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
 341         new = stack_alloc();
 342         if (!new)
 343                 panic("Couldn't allocate async stack");
 344         S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
 345         free_pages(old, THREAD_SIZE_ORDER);
 346         return 0;
 347 }
 348 early_initcall(async_stack_realloc);
 349
 350 void __init arch_call_rest_init(void)
 351 {
 352         unsigned long stack;
 353
 354         stack = stack_alloc();
 355         if (!stack)
 356                 panic("Couldn't allocate kernel stack");
 357         current->stack = (void *) stack;
 358 #ifdef CONFIG_VMAP_STACK
 359         current->stack_vm_area = (void *) stack;
 360 #endif
 361         set_task_stack_end_magic(current);
 362         stack += STACK_INIT_OFFSET;
 363         S390_lowcore.kernel_stack = stack;
 364         CALL_ON_STACK_NORETURN(rest_init, stack);
 365 }
 366
 367 static void __init setup_lowcore_dat_off(void)
 368 {
 369         struct lowcore *lc;
 370
 371         /*
 372          * Setup lowcore for boot cpu
 373          */
 374         BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
 375         lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
 376         if (!lc)
 377                 panic("%s: Failed to allocate %zu bytes align=%zx\n",
 378                       __func__, sizeof(*lc), sizeof(*lc));
 379
 380         lc->restart_psw.mask = PSW_KERNEL_BITS;
 381         lc->restart_psw.addr = (unsigned long) restart_int_handler;
 382         lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 383         lc->external_new_psw.addr = (unsigned long) ext_int_handler;
 384         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 385         lc->svc_new_psw.addr = (unsigned long) system_call;
 386         lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 387         lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
 388         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 389         lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
 390         lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 391         lc->io_new_psw.addr = (unsigned long) io_int_handler;
 392         lc->clock_comparator = clock_comparator_max;
 393         lc->nodat_stack = ((unsigned long) &init_thread_union)
 394                 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 395         lc->current_task = (unsigned long)&init_task;
 396         lc->lpp = LPP_MAGIC;
 397         lc->machine_flags = S390_lowcore.machine_flags;
 398         lc->preempt_count = S390_lowcore.preempt_count;
 399         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 400         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 401                sizeof(lc->stfle_fac_list));
 402         memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
 403                sizeof(lc->alt_stfle_fac_list));
 404         nmi_alloc_boot_cpu(lc);
 405         vdso_alloc_boot_cpu(lc);
 406         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 407         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 408         lc->exit_timer = S390_lowcore.exit_timer;
 409         lc->user_timer = S390_lowcore.user_timer;
 410         lc->system_timer = S390_lowcore.system_timer;
 411         lc->steal_timer = S390_lowcore.steal_timer;
 412         lc->last_update_timer = S390_lowcore.last_update_timer;
 413         lc->last_update_clock = S390_lowcore.last_update_clock;
 414
 415         /*
 416          * Allocate the global restart stack which is the same for
 417          * all CPUs in cast *one* of them does a PSW restart.
 418          */
 419         restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
 420         if (!restart_stack)
 421                 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 422                       __func__, THREAD_SIZE, THREAD_SIZE);
 423         restart_stack += STACK_INIT_OFFSET;
 424
 425         /*
 426          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 427          * restart data to the absolute zero lowcore. This is necessary if
 428          * PSW restart is done on an offline CPU that has lowcore zero.
 429          */
 430         lc->restart_stack = (unsigned long) restart_stack;
 431         lc->restart_fn = (unsigned long) do_restart;
 432         lc->restart_data = 0;
 433         lc->restart_source = -1UL;
 434
 435         /* Setup absolute zero lowcore */
 436         mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
 437         mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
 438         mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
 439         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
 440         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
 441
 442         lc->spinlock_lockval = arch_spin_lockval(0);
 443         lc->spinlock_index = 0;
 444         arch_spin_lock_setup(0);
 445         lc->br_r1_trampoline = 0x07f1;  /* br %r1 */
 446         lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
 447         lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
 448
 449         set_prefix((u32)(unsigned long) lc);
 450         lowcore_ptr[0] = lc;
 451 }
 452
 453 static void __init setup_lowcore_dat_on(void)
 454 {
 455         __ctl_clear_bit(0, 28);
 456         S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
 457         S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
 458         S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
 459         S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
 460         __ctl_set_bit(0, 28);
 461 }
 462
 463 static struct resource code_resource = {
 464         .name  = "Kernel code",
 465         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 466 };
 467
 468 static struct resource data_resource = {
 469         .name = "Kernel data",
 470         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 471 };
 472
 473 static struct resource bss_resource = {
 474         .name = "Kernel bss",
 475         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 476 };
 477
 478 static struct resource __initdata *standard_resources[] = {
 479         &code_resource,
 480         &data_resource,
 481         &bss_resource,
 482 };
 483
 484 static void __init setup_resources(void)
 485 {
 486         struct resource *res, *std_res, *sub_res;
 487         struct memblock_region *reg;
 488         int j;
 489
 490         code_resource.start = (unsigned long) _text;
 491         code_resource.end = (unsigned long) _etext - 1;
 492         data_resource.start = (unsigned long) _etext;
 493         data_resource.end = (unsigned long) _edata - 1;
 494         bss_resource.start = (unsigned long) __bss_start;
 495         bss_resource.end = (unsigned long) __bss_stop - 1;
 496
 497         for_each_memblock(memory, reg) {
 498                 res = memblock_alloc(sizeof(*res), 8);
 499                 if (!res)
 500                         panic("%s: Failed to allocate %zu bytes align=0x%x\n",
 501                               __func__, sizeof(*res), 8);
 502                 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
 503
 504                 res->name = "System RAM";
 505                 res->start = reg->base;
 506                 res->end = reg->base + reg->size - 1;
 507                 request_resource(&iomem_resource, res);
 508
 509                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 510                         std_res = standard_resources[j];
 511                         if (std_res->start < res->start ||
 512                             std_res->start > res->end)
 513                                 continue;
 514                         if (std_res->end > res->end) {
 515                                 sub_res = memblock_alloc(sizeof(*sub_res), 8);
 516                                 if (!sub_res)
 517                                         panic("%s: Failed to allocate %zu bytes align=0x%x\n",
 518                                               __func__, sizeof(*sub_res), 8);
 519                                 *sub_res = *std_res;
 520                                 sub_res->end = res->end;
 521                                 std_res->start = res->end + 1;
 522                                 request_resource(res, sub_res);
 523                         } else {
 524                                 request_resource(res, std_res);
 525                         }
 526                 }
 527         }
 528 #ifdef CONFIG_CRASH_DUMP
 529         /*
 530          * Re-add removed crash kernel memory as reserved memory. This makes
 531          * sure it will be mapped with the identity mapping and struct pages
 532          * will be created, so it can be resized later on.
 533          * However add it later since the crash kernel resource should not be
 534          * part of the System RAM resource.
 535          */
 536         if (crashk_res.end) {
 537                 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
 538                 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
 539                 insert_resource(&iomem_resource, &crashk_res);
 540         }
 541 #endif
 542 }
 543
 544 static void __init setup_memory_end(void)
 545 {
 546         unsigned long vmax, tmp;
 547
 548         /* Choose kernel address space layout: 3 or 4 levels. */
 549         if (IS_ENABLED(CONFIG_KASAN)) {
 550                 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
 551                            ? _REGION1_SIZE
 552                            : _REGION2_SIZE;
 553         } else {
 554                 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
 555                 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
 556                 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
 557                         vmax = _REGION2_SIZE; /* 3-level kernel page table */
 558                 else
 559                         vmax = _REGION1_SIZE; /* 4-level kernel page table */
 560         }
 561
 562         if (is_prot_virt_host())
 563                 adjust_to_uv_max(&vmax);
 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 the area
 597  * [0 - crashkernel memory size] is set offline - it will be exchanged with
 598  * the crashkernel memory region when kdump is triggered. The crashkernel
 599  * memory region can never get offlined (pages are unmovable).
 600  */
 601 static int kdump_mem_notifier(struct notifier_block *nb,
 602                               unsigned long action, void *data)
 603 {
 604         struct memory_notify *arg = data;
 605
 606         if (action != MEM_GOING_OFFLINE)
 607                 return NOTIFY_OK;
 608         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 609                 return NOTIFY_BAD;
 610         return NOTIFY_OK;
 611 }
 612
 613 static struct notifier_block kdump_mem_nb = {
 614         .notifier_call = kdump_mem_notifier,
 615 };
 616
 617 #endif
 618
 619 /*
 620  * Make sure that the area behind memory_end is protected
 621  */
 622 static void reserve_memory_end(void)
 623 {
 624         if (memory_end_set)
 625                 memblock_reserve(memory_end, ULONG_MAX);
 626 }
 627
 628 /*
 629  * Make sure that oldmem, where the dump is stored, is protected
 630  */
 631 static void reserve_oldmem(void)
 632 {
 633 #ifdef CONFIG_CRASH_DUMP
 634         if (OLDMEM_BASE)
 635                 /* Forget all memory above the running kdump system */
 636                 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
 637 #endif
 638 }
 639
 640 /*
 641  * Make sure that oldmem, where the dump is stored, is protected
 642  */
 643 static void remove_oldmem(void)
 644 {
 645 #ifdef CONFIG_CRASH_DUMP
 646         if (OLDMEM_BASE)
 647                 /* Forget all memory above the running kdump system */
 648                 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
 649 #endif
 650 }
 651
 652 /*
 653  * Reserve memory for kdump kernel to be loaded with kexec
 654  */
 655 static void __init reserve_crashkernel(void)
 656 {
 657 #ifdef CONFIG_CRASH_DUMP
 658         unsigned long long crash_base, crash_size;
 659         phys_addr_t low, high;
 660         int rc;
 661
 662         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 663                                &crash_base);
 664
 665         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 666         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 667         if (rc || crash_size == 0)
 668                 return;
 669
 670         if (memblock.memory.regions[0].size < crash_size) {
 671                 pr_info("crashkernel reservation failed: %s\n",
 672                         "first memory chunk must be at least crashkernel size");
 673                 return;
 674         }
 675
 676         low = crash_base ?: OLDMEM_BASE;
 677         high = low + crash_size;
 678         if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
 679                 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
 680                 crash_base = low;
 681         } else {
 682                 /* Find suitable area in free memory */
 683                 low = max_t(unsigned long, crash_size, sclp.hsa_size);
 684                 high = crash_base ? crash_base + crash_size : ULONG_MAX;
 685
 686                 if (crash_base && crash_base < low) {
 687                         pr_info("crashkernel reservation failed: %s\n",
 688                                 "crash_base too low");
 689                         return;
 690                 }
 691                 low = crash_base ?: low;
 692                 crash_base = memblock_find_in_range(low, high, crash_size,
 693                                                     KEXEC_CRASH_MEM_ALIGN);
 694         }
 695
 696         if (!crash_base) {
 697                 pr_info("crashkernel reservation failed: %s\n",
 698                         "no suitable area found");
 699                 return;
 700         }
 701
 702         if (register_memory_notifier(&kdump_mem_nb))
 703                 return;
 704
 705         if (!OLDMEM_BASE && MACHINE_IS_VM)
 706                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
 707         crashk_res.start = crash_base;
 708         crashk_res.end = crash_base + crash_size - 1;
 709         memblock_remove(crash_base, crash_size);
 710         pr_info("Reserving %lluMB of memory at %lluMB "
 711                 "for crashkernel (System RAM: %luMB)\n",
 712                 crash_size >> 20, crash_base >> 20,
 713                 (unsigned long)memblock.memory.total_size >> 20);
 714         os_info_crashkernel_add(crash_base, crash_size);
 715 #endif
 716 }
 717
 718 /*
 719  * Reserve the initrd from being used by memblock
 720  */
 721 static void __init reserve_initrd(void)
 722 {
 723 #ifdef CONFIG_BLK_DEV_INITRD
 724         if (!INITRD_START || !INITRD_SIZE)
 725                 return;
 726         initrd_start = INITRD_START;
 727         initrd_end = initrd_start + INITRD_SIZE;
 728         memblock_reserve(INITRD_START, INITRD_SIZE);
 729 #endif
 730 }
 731
 732 /*
 733  * Reserve the memory area used to pass the certificate lists
 734  */
 735 static void __init reserve_certificate_list(void)
 736 {
 737         if (ipl_cert_list_addr)
 738                 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
 739 }
 740
 741 static void __init reserve_mem_detect_info(void)
 742 {
 743         unsigned long start, size;
 744
 745         get_mem_detect_reserved(&start, &size);
 746         if (size)
 747                 memblock_reserve(start, size);
 748 }
 749
 750 static void __init free_mem_detect_info(void)
 751 {
 752         unsigned long start, size;
 753
 754         get_mem_detect_reserved(&start, &size);
 755         if (size)
 756                 memblock_free(start, size);
 757 }
 758
 759 static const char * __init get_mem_info_source(void)
 760 {
 761         switch (mem_detect.info_source) {
 762         case MEM_DETECT_SCLP_STOR_INFO:
 763                 return "sclp storage info";
 764         case MEM_DETECT_DIAG260:
 765                 return "diag260";
 766         case MEM_DETECT_SCLP_READ_INFO:
 767                 return "sclp read info";
 768         case MEM_DETECT_BIN_SEARCH:
 769                 return "binary search";
 770         }
 771         return "none";
 772 }
 773
 774 static void __init memblock_add_mem_detect_info(void)
 775 {
 776         unsigned long start, end;
 777         int i;
 778
 779         memblock_dbg("physmem info source: %s (%hhd)\n",
 780                      get_mem_info_source(), mem_detect.info_source);
 781         /* keep memblock lists close to the kernel */
 782         memblock_set_bottom_up(true);
 783         for_each_mem_detect_block(i, &start, &end) {
 784                 memblock_add(start, end - start);
 785                 memblock_physmem_add(start, end - start);
 786         }
 787         memblock_set_bottom_up(false);
 788         memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
 789         memblock_dump_all();
 790 }
 791
 792 /*
 793  * Check for initrd being in usable memory
 794  */
 795 static void __init check_initrd(void)
 796 {
 797 #ifdef CONFIG_BLK_DEV_INITRD
 798         if (INITRD_START && INITRD_SIZE &&
 799             !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
 800                 pr_err("The initial RAM disk does not fit into the memory\n");
 801                 memblock_free(INITRD_START, INITRD_SIZE);
 802                 initrd_start = initrd_end = 0;
 803         }
 804 #endif
 805 }
 806
 807 /*
 808  * Reserve memory used for lowcore/command line/kernel image.
 809  */
 810 static void __init reserve_kernel(void)
 811 {
 812         unsigned long start_pfn = PFN_UP(__pa(_end));
 813
 814         memblock_reserve(0, HEAD_END);
 815         memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
 816                          - (unsigned long)_stext);
 817         memblock_reserve(__sdma, __edma - __sdma);
 818 }
 819
 820 static void __init setup_memory(void)
 821 {
 822         struct memblock_region *reg;
 823
 824         /*
 825          * Init storage key for present memory
 826          */
 827         for_each_memblock(memory, reg) {
 828                 storage_key_init_range(reg->base, reg->base + reg->size);
 829         }
 830         psw_set_key(PAGE_DEFAULT_KEY);
 831
 832         /* Only cosmetics */
 833         memblock_enforce_memory_limit(memblock_end_of_DRAM());
 834 }
 835
 836 /*
 837  * Setup hardware capabilities.
 838  */
 839 static int __init setup_hwcaps(void)
 840 {
 841         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 842         struct cpuid cpu_id;
 843         int i;
 844
 845         /*
 846          * The store facility list bits numbers as found in the principles
 847          * of operation are numbered with bit 1UL<<31 as number 0 to
 848          * bit 1UL<<0 as number 31.
 849          *   Bit 0: instructions named N3, "backported" to esa-mode
 850          *   Bit 2: z/Architecture mode is active
 851          *   Bit 7: the store-facility-list-extended facility is installed
 852          *   Bit 17: the message-security assist is installed
 853          *   Bit 19: the long-displacement facility is installed
 854          *   Bit 21: the extended-immediate facility is installed
 855          *   Bit 22: extended-translation facility 3 is installed
 856          *   Bit 30: extended-translation facility 3 enhancement facility
 857          * These get translated to:
 858          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 859          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 860          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 861          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 862          */
 863         for (i = 0; i < 6; i++)
 864                 if (test_facility(stfl_bits[i]))
 865                         elf_hwcap |= 1UL << i;
 866
 867         if (test_facility(22) && test_facility(30))
 868                 elf_hwcap |= HWCAP_S390_ETF3EH;
 869
 870         /*
 871          * Check for additional facilities with store-facility-list-extended.
 872          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 873          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 874          * as stored by stfl, bits 32-xxx contain additional facilities.
 875          * How many facility words are stored depends on the number of
 876          * doublewords passed to the instruction. The additional facilities
 877          * are:
 878          *   Bit 42: decimal floating point facility is installed
 879          *   Bit 44: perform floating point operation facility is installed
 880          * translated to:
 881          *   HWCAP_S390_DFP bit 6 (42 && 44).
 882          */
 883         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 884                 elf_hwcap |= HWCAP_S390_DFP;
 885
 886         /*
 887          * Huge page support HWCAP_S390_HPAGE is bit 7.
 888          */
 889         if (MACHINE_HAS_EDAT1)
 890                 elf_hwcap |= HWCAP_S390_HPAGE;
 891
 892         /*
 893          * 64-bit register support for 31-bit processes
 894          * HWCAP_S390_HIGH_GPRS is bit 9.
 895          */
 896         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 897
 898         /*
 899          * Transactional execution support HWCAP_S390_TE is bit 10.
 900          */
 901         if (MACHINE_HAS_TE)
 902                 elf_hwcap |= HWCAP_S390_TE;
 903
 904         /*
 905          * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
 906          * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
 907          * instead of facility bit 129.
 908          */
 909         if (MACHINE_HAS_VX) {
 910                 elf_hwcap |= HWCAP_S390_VXRS;
 911                 if (test_facility(134))
 912                         elf_hwcap |= HWCAP_S390_VXRS_EXT;
 913                 if (test_facility(135))
 914                         elf_hwcap |= HWCAP_S390_VXRS_BCD;
 915                 if (test_facility(148))
 916                         elf_hwcap |= HWCAP_S390_VXRS_EXT2;
 917                 if (test_facility(152))
 918                         elf_hwcap |= HWCAP_S390_VXRS_PDE;
 919         }
 920         if (test_facility(150))
 921                 elf_hwcap |= HWCAP_S390_SORT;
 922         if (test_facility(151))
 923                 elf_hwcap |= HWCAP_S390_DFLT;
 924
 925         /*
 926          * Guarded storage support HWCAP_S390_GS is bit 12.
 927          */
 928         if (MACHINE_HAS_GS)
 929                 elf_hwcap |= HWCAP_S390_GS;
 930
 931         get_cpu_id(&cpu_id);
 932         add_device_randomness(&cpu_id, sizeof(cpu_id));
 933         switch (cpu_id.machine) {
 934         case 0x2064:
 935         case 0x2066:
 936         default:        /* Use "z900" as default for 64 bit kernels. */
 937                 strcpy(elf_platform, "z900");
 938                 break;
 939         case 0x2084:
 940         case 0x2086:
 941                 strcpy(elf_platform, "z990");
 942                 break;
 943         case 0x2094:
 944         case 0x2096:
 945                 strcpy(elf_platform, "z9-109");
 946                 break;
 947         case 0x2097:
 948         case 0x2098:
 949                 strcpy(elf_platform, "z10");
 950                 break;
 951         case 0x2817:
 952         case 0x2818:
 953                 strcpy(elf_platform, "z196");
 954                 break;
 955         case 0x2827:
 956         case 0x2828:
 957                 strcpy(elf_platform, "zEC12");
 958                 break;
 959         case 0x2964:
 960         case 0x2965:
 961                 strcpy(elf_platform, "z13");
 962                 break;
 963         case 0x3906:
 964         case 0x3907:
 965                 strcpy(elf_platform, "z14");
 966                 break;
 967         case 0x8561:
 968         case 0x8562:
 969                 strcpy(elf_platform, "z15");
 970                 break;
 971         }
 972
 973         /*
 974          * Virtualization support HWCAP_INT_SIE is bit 0.
 975          */
 976         if (sclp.has_sief2)
 977                 int_hwcap |= HWCAP_INT_SIE;
 978
 979         return 0;
 980 }
 981 arch_initcall(setup_hwcaps);
 982
 983 /*
 984  * Add system information as device randomness
 985  */
 986 static void __init setup_randomness(void)
 987 {
 988         struct sysinfo_3_2_2 *vmms;
 989
 990         vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
 991                                                             PAGE_SIZE);
 992         if (!vmms)
 993                 panic("Failed to allocate memory for sysinfo structure\n");
 994
 995         if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
 996                 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
 997         memblock_free((unsigned long) vmms, PAGE_SIZE);
 998 }
 999
1000 /*
1001  * Find the correct size for the task_struct. This depends on
1002  * the size of the struct fpu at the end of the thread_struct
1003  * which is embedded in the task_struct.
1004  */
1005 static void __init setup_task_size(void)
1006 {
1007         int task_size = sizeof(struct task_struct);
1008
1009         if (!MACHINE_HAS_VX) {
1010                 task_size -= sizeof(__vector128) * __NUM_VXRS;
1011                 task_size += sizeof(freg_t) * __NUM_FPRS;
1012         }
1013         arch_task_struct_size = task_size;
1014 }
1015
1016 /*
1017  * Issue diagnose 318 to set the control program name and
1018  * version codes.
1019  */
1020 static void __init setup_control_program_code(void)
1021 {
1022         union diag318_info diag318_info = {
1023                 .cpnc = CPNC_LINUX,
1024                 .cpvc = 0,
1025         };
1026
1027         if (!sclp.has_diag318)
1028                 return;
1029
1030         diag_stat_inc(DIAG_STAT_X318);
1031         asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1032 }
1033
1034 /*
1035  * Print the component list from the IPL report
1036  */
1037 static void __init log_component_list(void)
1038 {
1039         struct ipl_rb_component_entry *ptr, *end;
1040         char *str;
1041
1042         if (!early_ipl_comp_list_addr)
1043                 return;
1044         if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
1045                 pr_info("Linux is running with Secure-IPL enabled\n");
1046         else
1047                 pr_info("Linux is running with Secure-IPL disabled\n");
1048         ptr = (void *) early_ipl_comp_list_addr;
1049         end = (void *) ptr + early_ipl_comp_list_size;
1050         pr_info("The IPL report contains the following components:\n");
1051         while (ptr < end) {
1052                 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1053                         if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1054                                 str = "signed, verified";
1055                         else
1056                                 str = "signed, verification failed";
1057                 } else {
1058                         str = "not signed";
1059                 }
1060                 pr_info("%016llx - %016llx (%s)\n",
1061                         ptr->addr, ptr->addr + ptr->len, str);
1062                 ptr++;
1063         }
1064 }
1065
1066 /*
1067  * Setup function called from init/main.c just after the banner
1068  * was printed.
1069  */
1070
1071 void __init setup_arch(char **cmdline_p)
1072 {
1073         /*
1074          * print what head.S has found out about the machine
1075          */
1076         if (MACHINE_IS_VM)
1077                 pr_info("Linux is running as a z/VM "
1078                         "guest operating system in 64-bit mode\n");
1079         else if (MACHINE_IS_KVM)
1080                 pr_info("Linux is running under KVM in 64-bit mode\n");
1081         else if (MACHINE_IS_LPAR)
1082                 pr_info("Linux is running natively in 64-bit mode\n");
1083         else
1084                 pr_info("Linux is running as a guest in 64-bit mode\n");
1085
1086         log_component_list();
1087
1088         /* Have one command line that is parsed and saved in /proc/cmdline */
1089         /* boot_command_line has been already set up in early.c */
1090         *cmdline_p = boot_command_line;
1091
1092         ROOT_DEV = Root_RAM0;
1093
1094         init_mm.start_code = (unsigned long) _text;
1095         init_mm.end_code = (unsigned long) _etext;
1096         init_mm.end_data = (unsigned long) _edata;
1097         init_mm.brk = (unsigned long) _end;
1098
1099         if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1100                 nospec_auto_detect();
1101
1102         jump_label_init();
1103         parse_early_param();
1104 #ifdef CONFIG_CRASH_DUMP
1105         /* Deactivate elfcorehdr= kernel parameter */
1106         elfcorehdr_addr = ELFCORE_ADDR_MAX;
1107 #endif
1108
1109         os_info_init();
1110         setup_ipl();
1111         setup_task_size();
1112         setup_control_program_code();
1113
1114         /* Do some memory reservations *before* memory is added to memblock */
1115         reserve_memory_end();
1116         reserve_oldmem();
1117         reserve_kernel();
1118         reserve_initrd();
1119         reserve_certificate_list();
1120         reserve_mem_detect_info();
1121         memblock_allow_resize();
1122
1123         /* Get information about *all* installed memory */
1124         memblock_add_mem_detect_info();
1125
1126         free_mem_detect_info();
1127         remove_oldmem();
1128
1129         if (is_prot_virt_host())
1130                 setup_uv();
1131         setup_memory_end();
1132         setup_memory();
1133         dma_contiguous_reserve(memory_end);
1134         vmcp_cma_reserve();
1135
1136         check_initrd();
1137         reserve_crashkernel();
1138 #ifdef CONFIG_CRASH_DUMP
1139         /*
1140          * Be aware that smp_save_dump_cpus() triggers a system reset.
1141          * Therefore CPU and device initialization should be done afterwards.
1142          */
1143         smp_save_dump_cpus();
1144 #endif
1145
1146         setup_resources();
1147         setup_lowcore_dat_off();
1148         smp_fill_possible_mask();
1149         cpu_detect_mhz_feature();
1150         cpu_init();
1151         numa_setup();
1152         smp_detect_cpus();
1153         topology_init_early();
1154
1155         /*
1156          * Create kernel page tables and switch to virtual addressing.
1157          */
1158         paging_init();
1159
1160         /*
1161          * After paging_init created the kernel page table, the new PSWs
1162          * in lowcore can now run with DAT enabled.
1163          */
1164         setup_lowcore_dat_on();
1165
1166         /* Setup default console */
1167         conmode_default();
1168         set_preferred_console();
1169
1170         apply_alternative_instructions();
1171         if (IS_ENABLED(CONFIG_EXPOLINE))
1172                 nospec_init_branches();
1173
1174         /* Setup zfcpdump support */
1175         setup_zfcpdump();
1176
1177         /* Add system specific data to the random pool */
1178         setup_randomness();
1179 }