arch/s390/kernel/setup.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
condev_setup
set_preferred_console
conmode_setup
conmode_default
setup_zfcpdump
setup_zfcpdump
machine_restart
machine_halt
machine_power_off
stack_alloc
stack_free
arch_early_irq_init
async_stack_realloc
arch_call_rest_init
setup_lowcore_dat_off
setup_lowcore_dat_on
setup_resources
setup_memory_end
kdump_mem_notifier
reserve_memory_end
reserve_oldmem
remove_oldmem
reserve_crashkernel
reserve_initrd
reserve_certificate_list
reserve_mem_detect_info
free_mem_detect_info
memblock_physmem_add
get_mem_info_source
memblock_add_mem_detect_info
check_initrd
reserve_kernel
setup_memory
setup_hwcaps
setup_randomness
setup_task_size
setup_control_program_code
log_component_list
setup_arch
   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 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
  97 int __bootdata_preserved(prot_virt_guest);
  98 #endif
  99 
 100 int __bootdata(noexec_disabled);
 101 int __bootdata(memory_end_set);
 102 unsigned long __bootdata(memory_end);
 103 unsigned long __bootdata(vmalloc_size);
 104 unsigned long __bootdata(max_physmem_end);
 105 struct mem_detect_info __bootdata(mem_detect);
 106 
 107 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
 108 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
 109 unsigned long __bootdata_preserved(__swsusp_reset_dma);
 110 unsigned long __bootdata_preserved(__stext_dma);
 111 unsigned long __bootdata_preserved(__etext_dma);
 112 unsigned long __bootdata_preserved(__sdma);
 113 unsigned long __bootdata_preserved(__edma);
 114 unsigned long __bootdata_preserved(__kaslr_offset);
 115 
 116 unsigned long VMALLOC_START;
 117 EXPORT_SYMBOL(VMALLOC_START);
 118 
 119 unsigned long VMALLOC_END;
 120 EXPORT_SYMBOL(VMALLOC_END);
 121 
 122 struct page *vmemmap;
 123 EXPORT_SYMBOL(vmemmap);
 124 
 125 unsigned long MODULES_VADDR;
 126 unsigned long MODULES_END;
 127 
 128 /* An array with a pointer to the lowcore of every CPU. */
 129 struct lowcore *lowcore_ptr[NR_CPUS];
 130 EXPORT_SYMBOL(lowcore_ptr);
 131 
 132 /*
 133  * This is set up by the setup-routine at boot-time
 134  * for S390 need to find out, what we have to setup
 135  * using address 0x10400 ...
 136  */
 137 
 138 #include <asm/setup.h>
 139 
 140 /*
 141  * condev= and conmode= setup parameter.
 142  */
 143 
 144 static int __init condev_setup(char *str)
 145 {
 146         int vdev;
 147 
 148         vdev = simple_strtoul(str, &str, 0);
 149         if (vdev >= 0 && vdev < 65536) {
 150                 console_devno = vdev;
 151                 console_irq = -1;
 152         }
 153         return 1;
 154 }
 155 
 156 __setup("condev=", condev_setup);
 157 
 158 static void __init set_preferred_console(void)
 159 {
 160         if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 161                 add_preferred_console("ttyS", 0, NULL);
 162         else if (CONSOLE_IS_3270)
 163                 add_preferred_console("tty3270", 0, NULL);
 164         else if (CONSOLE_IS_VT220)
 165                 add_preferred_console("ttyS", 1, NULL);
 166         else if (CONSOLE_IS_HVC)
 167                 add_preferred_console("hvc", 0, NULL);
 168 }
 169 
 170 static int __init conmode_setup(char *str)
 171 {
 172 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 173         if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
 174                 SET_CONSOLE_SCLP;
 175 #endif
 176 #if defined(CONFIG_TN3215_CONSOLE)
 177         if (!strcmp(str, "3215"))
 178                 SET_CONSOLE_3215;
 179 #endif
 180 #if defined(CONFIG_TN3270_CONSOLE)
 181         if (!strcmp(str, "3270"))
 182                 SET_CONSOLE_3270;
 183 #endif
 184         set_preferred_console();
 185         return 1;
 186 }
 187 
 188 __setup("conmode=", conmode_setup);
 189 
 190 static void __init conmode_default(void)
 191 {
 192         char query_buffer[1024];
 193         char *ptr;
 194 
 195         if (MACHINE_IS_VM) {
 196                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 197                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 198                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 199                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 200                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 201                 ptr = strstr(query_buffer, "CONMODE");
 202                 /*
 203                  * Set the conmode to 3215 so that the device recognition 
 204                  * will set the cu_type of the console to 3215. If the
 205                  * conmode is 3270 and we don't set it back then both
 206                  * 3215 and the 3270 driver will try to access the console
 207                  * device (3215 as console and 3270 as normal tty).
 208                  */
 209                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 210                 if (ptr == NULL) {
 211 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 212                         SET_CONSOLE_SCLP;
 213 #endif
 214                         return;
 215                 }
 216                 if (str_has_prefix(ptr + 8, "3270")) {
 217 #if defined(CONFIG_TN3270_CONSOLE)
 218                         SET_CONSOLE_3270;
 219 #elif defined(CONFIG_TN3215_CONSOLE)
 220                         SET_CONSOLE_3215;
 221 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 222                         SET_CONSOLE_SCLP;
 223 #endif
 224                 } else if (str_has_prefix(ptr + 8, "3215")) {
 225 #if defined(CONFIG_TN3215_CONSOLE)
 226                         SET_CONSOLE_3215;
 227 #elif defined(CONFIG_TN3270_CONSOLE)
 228                         SET_CONSOLE_3270;
 229 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 230                         SET_CONSOLE_SCLP;
 231 #endif
 232                 }
 233         } else if (MACHINE_IS_KVM) {
 234                 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
 235                         SET_CONSOLE_VT220;
 236                 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
 237                         SET_CONSOLE_SCLP;
 238                 else
 239                         SET_CONSOLE_HVC;
 240         } else {
 241 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 242                 SET_CONSOLE_SCLP;
 243 #endif
 244         }
 245         if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
 246                 conswitchp = &dummy_con;
 247 }
 248 
 249 #ifdef CONFIG_CRASH_DUMP
 250 static void __init setup_zfcpdump(void)
 251 {
 252         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 253                 return;
 254         if (OLDMEM_BASE)
 255                 return;
 256         strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
 257         console_loglevel = 2;
 258 }
 259 #else
 260 static inline void setup_zfcpdump(void) {}
 261 #endif /* CONFIG_CRASH_DUMP */
 262 
 263  /*
 264  * Reboot, halt and power_off stubs. They just call _machine_restart,
 265  * _machine_halt or _machine_power_off. 
 266  */
 267 
 268 void machine_restart(char *command)
 269 {
 270         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 271                 /*
 272                  * Only unblank the console if we are called in enabled
 273                  * context or a bust_spinlocks cleared the way for us.
 274                  */
 275                 console_unblank();
 276         _machine_restart(command);
 277 }
 278 
 279 void machine_halt(void)
 280 {
 281         if (!in_interrupt() || oops_in_progress)
 282                 /*
 283                  * Only unblank the console if we are called in enabled
 284                  * context or a bust_spinlocks cleared the way for us.
 285                  */
 286                 console_unblank();
 287         _machine_halt();
 288 }
 289 
 290 void machine_power_off(void)
 291 {
 292         if (!in_interrupt() || oops_in_progress)
 293                 /*
 294                  * Only unblank the console if we are called in enabled
 295                  * context or a bust_spinlocks cleared the way for us.
 296                  */
 297                 console_unblank();
 298         _machine_power_off();
 299 }
 300 
 301 /*
 302  * Dummy power off function.
 303  */
 304 void (*pm_power_off)(void) = machine_power_off;
 305 EXPORT_SYMBOL_GPL(pm_power_off);
 306 
 307 void *restart_stack __section(.data);
 308 
 309 unsigned long stack_alloc(void)
 310 {
 311 #ifdef CONFIG_VMAP_STACK
 312         return (unsigned long)
 313                 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
 314                                      VMALLOC_START, VMALLOC_END,
 315                                      THREADINFO_GFP,
 316                                      PAGE_KERNEL, 0, NUMA_NO_NODE,
 317                                      __builtin_return_address(0));
 318 #else
 319         return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
 320 #endif
 321 }
 322 
 323 void stack_free(unsigned long stack)
 324 {
 325 #ifdef CONFIG_VMAP_STACK
 326         vfree((void *) stack);
 327 #else
 328         free_pages(stack, THREAD_SIZE_ORDER);
 329 #endif
 330 }
 331 
 332 int __init arch_early_irq_init(void)
 333 {
 334         unsigned long stack;
 335 
 336         stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
 337         if (!stack)
 338                 panic("Couldn't allocate async stack");
 339         S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
 340         return 0;
 341 }
 342 
 343 static int __init async_stack_realloc(void)
 344 {
 345         unsigned long old, new;
 346 
 347         old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
 348         new = stack_alloc();
 349         if (!new)
 350                 panic("Couldn't allocate async stack");
 351         S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
 352         free_pages(old, THREAD_SIZE_ORDER);
 353         return 0;
 354 }
 355 early_initcall(async_stack_realloc);
 356 
 357 void __init arch_call_rest_init(void)
 358 {
 359         struct stack_frame *frame;
 360         unsigned long stack;
 361 
 362         stack = stack_alloc();
 363         if (!stack)
 364                 panic("Couldn't allocate kernel stack");
 365         current->stack = (void *) stack;
 366 #ifdef CONFIG_VMAP_STACK
 367         current->stack_vm_area = (void *) stack;
 368 #endif
 369         set_task_stack_end_magic(current);
 370         stack += STACK_INIT_OFFSET;
 371         S390_lowcore.kernel_stack = stack;
 372         frame = (struct stack_frame *) stack;
 373         memset(frame, 0, sizeof(*frame));
 374         /* Branch to rest_init on the new stack, never returns */
 375         asm volatile(
 376                 "       la      15,0(%[_frame])\n"
 377                 "       jg      rest_init\n"
 378                 : : [_frame] "a" (frame));
 379 }
 380 
 381 static void __init setup_lowcore_dat_off(void)
 382 {
 383         struct lowcore *lc;
 384 
 385         /*
 386          * Setup lowcore for boot cpu
 387          */
 388         BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
 389         lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
 390         if (!lc)
 391                 panic("%s: Failed to allocate %zu bytes align=%zx\n",
 392                       __func__, sizeof(*lc), sizeof(*lc));
 393 
 394         lc->restart_psw.mask = PSW_KERNEL_BITS;
 395         lc->restart_psw.addr = (unsigned long) restart_int_handler;
 396         lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 397         lc->external_new_psw.addr = (unsigned long) ext_int_handler;
 398         lc->svc_new_psw.mask = PSW_KERNEL_BITS |
 399                 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 400         lc->svc_new_psw.addr = (unsigned long) system_call;
 401         lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 402         lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
 403         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 404         lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
 405         lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 406         lc->io_new_psw.addr = (unsigned long) io_int_handler;
 407         lc->clock_comparator = clock_comparator_max;
 408         lc->nodat_stack = ((unsigned long) &init_thread_union)
 409                 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 410         lc->current_task = (unsigned long)&init_task;
 411         lc->lpp = LPP_MAGIC;
 412         lc->machine_flags = S390_lowcore.machine_flags;
 413         lc->preempt_count = S390_lowcore.preempt_count;
 414         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 415         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 416                sizeof(lc->stfle_fac_list));
 417         memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
 418                sizeof(lc->alt_stfle_fac_list));
 419         nmi_alloc_boot_cpu(lc);
 420         vdso_alloc_boot_cpu(lc);
 421         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 422         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 423         lc->exit_timer = S390_lowcore.exit_timer;
 424         lc->user_timer = S390_lowcore.user_timer;
 425         lc->system_timer = S390_lowcore.system_timer;
 426         lc->steal_timer = S390_lowcore.steal_timer;
 427         lc->last_update_timer = S390_lowcore.last_update_timer;
 428         lc->last_update_clock = S390_lowcore.last_update_clock;
 429 
 430         /*
 431          * Allocate the global restart stack which is the same for
 432          * all CPUs in cast *one* of them does a PSW restart.
 433          */
 434         restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
 435         if (!restart_stack)
 436                 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 437                       __func__, THREAD_SIZE, THREAD_SIZE);
 438         restart_stack += STACK_INIT_OFFSET;
 439 
 440         /*
 441          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 442          * restart data to the absolute zero lowcore. This is necessary if
 443          * PSW restart is done on an offline CPU that has lowcore zero.
 444          */
 445         lc->restart_stack = (unsigned long) restart_stack;
 446         lc->restart_fn = (unsigned long) do_restart;
 447         lc->restart_data = 0;
 448         lc->restart_source = -1UL;
 449 
 450         /* Setup absolute zero lowcore */
 451         mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
 452         mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
 453         mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
 454         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
 455         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
 456 
 457         lc->spinlock_lockval = arch_spin_lockval(0);
 458         lc->spinlock_index = 0;
 459         arch_spin_lock_setup(0);
 460         lc->br_r1_trampoline = 0x07f1;  /* br %r1 */
 461         lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
 462         lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
 463 
 464         set_prefix((u32)(unsigned long) lc);
 465         lowcore_ptr[0] = lc;
 466 }
 467 
 468 static void __init setup_lowcore_dat_on(void)
 469 {
 470         __ctl_clear_bit(0, 28);
 471         S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
 472         S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
 473         S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
 474         S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
 475         __ctl_set_bit(0, 28);
 476 }
 477 
 478 static struct resource code_resource = {
 479         .name  = "Kernel code",
 480         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 481 };
 482 
 483 static struct resource data_resource = {
 484         .name = "Kernel data",
 485         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 486 };
 487 
 488 static struct resource bss_resource = {
 489         .name = "Kernel bss",
 490         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 491 };
 492 
 493 static struct resource __initdata *standard_resources[] = {
 494         &code_resource,
 495         &data_resource,
 496         &bss_resource,
 497 };
 498 
 499 static void __init setup_resources(void)
 500 {
 501         struct resource *res, *std_res, *sub_res;
 502         struct memblock_region *reg;
 503         int j;
 504 
 505         code_resource.start = (unsigned long) _text;
 506         code_resource.end = (unsigned long) _etext - 1;
 507         data_resource.start = (unsigned long) _etext;
 508         data_resource.end = (unsigned long) _edata - 1;
 509         bss_resource.start = (unsigned long) __bss_start;
 510         bss_resource.end = (unsigned long) __bss_stop - 1;
 511 
 512         for_each_memblock(memory, reg) {
 513                 res = memblock_alloc(sizeof(*res), 8);
 514                 if (!res)
 515                         panic("%s: Failed to allocate %zu bytes align=0x%x\n",
 516                               __func__, sizeof(*res), 8);
 517                 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
 518 
 519                 res->name = "System RAM";
 520                 res->start = reg->base;
 521                 res->end = reg->base + reg->size - 1;
 522                 request_resource(&iomem_resource, res);
 523 
 524                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 525                         std_res = standard_resources[j];
 526                         if (std_res->start < res->start ||
 527                             std_res->start > res->end)
 528                                 continue;
 529                         if (std_res->end > res->end) {
 530                                 sub_res = memblock_alloc(sizeof(*sub_res), 8);
 531                                 if (!sub_res)
 532                                         panic("%s: Failed to allocate %zu bytes align=0x%x\n",
 533                                               __func__, sizeof(*sub_res), 8);
 534                                 *sub_res = *std_res;
 535                                 sub_res->end = res->end;
 536                                 std_res->start = res->end + 1;
 537                                 request_resource(res, sub_res);
 538                         } else {
 539                                 request_resource(res, std_res);
 540                         }
 541                 }
 542         }
 543 #ifdef CONFIG_CRASH_DUMP
 544         /*
 545          * Re-add removed crash kernel memory as reserved memory. This makes
 546          * sure it will be mapped with the identity mapping and struct pages
 547          * will be created, so it can be resized later on.
 548          * However add it later since the crash kernel resource should not be
 549          * part of the System RAM resource.
 550          */
 551         if (crashk_res.end) {
 552                 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
 553                 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
 554                 insert_resource(&iomem_resource, &crashk_res);
 555         }
 556 #endif
 557 }
 558 
 559 static void __init setup_memory_end(void)
 560 {
 561         unsigned long vmax, tmp;
 562 
 563         /* Choose kernel address space layout: 3 or 4 levels. */
 564         if (IS_ENABLED(CONFIG_KASAN)) {
 565                 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
 566                            ? _REGION1_SIZE
 567                            : _REGION2_SIZE;
 568         } else {
 569                 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
 570                 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
 571                 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
 572                         vmax = _REGION2_SIZE; /* 3-level kernel page table */
 573                 else
 574                         vmax = _REGION1_SIZE; /* 4-level kernel page table */
 575         }
 576 
 577         /* module area is at the end of the kernel address space. */
 578         MODULES_END = vmax;
 579         MODULES_VADDR = MODULES_END - MODULES_LEN;
 580         VMALLOC_END = MODULES_VADDR;
 581         VMALLOC_START = VMALLOC_END - vmalloc_size;
 582 
 583         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
 584         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
 585         /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
 586         tmp = SECTION_ALIGN_UP(tmp);
 587         tmp = VMALLOC_START - tmp * sizeof(struct page);
 588         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
 589         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
 590         vmemmap = (struct page *) tmp;
 591 
 592         /* Take care that memory_end is set and <= vmemmap */
 593         memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
 594 #ifdef CONFIG_KASAN
 595         /* fit in kasan shadow memory region between 1:1 and vmemmap */
 596         memory_end = min(memory_end, KASAN_SHADOW_START);
 597         vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
 598 #endif
 599         max_pfn = max_low_pfn = PFN_DOWN(memory_end);
 600         memblock_remove(memory_end, ULONG_MAX);
 601 
 602         pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
 603 }
 604 
 605 #ifdef CONFIG_CRASH_DUMP
 606 
 607 /*
 608  * When kdump is enabled, we have to ensure that no memory from
 609  * the area [0 - crashkernel memory size] and
 610  * [crashk_res.start - crashk_res.end] is set offline.
 611  */
 612 static int kdump_mem_notifier(struct notifier_block *nb,
 613                               unsigned long action, void *data)
 614 {
 615         struct memory_notify *arg = data;
 616 
 617         if (action != MEM_GOING_OFFLINE)
 618                 return NOTIFY_OK;
 619         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 620                 return NOTIFY_BAD;
 621         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
 622                 return NOTIFY_OK;
 623         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
 624                 return NOTIFY_OK;
 625         return NOTIFY_BAD;
 626 }
 627 
 628 static struct notifier_block kdump_mem_nb = {
 629         .notifier_call = kdump_mem_notifier,
 630 };
 631 
 632 #endif
 633 
 634 /*
 635  * Make sure that the area behind memory_end is protected
 636  */
 637 static void reserve_memory_end(void)
 638 {
 639         if (memory_end_set)
 640                 memblock_reserve(memory_end, ULONG_MAX);
 641 }
 642 
 643 /*
 644  * Make sure that oldmem, where the dump is stored, is protected
 645  */
 646 static void reserve_oldmem(void)
 647 {
 648 #ifdef CONFIG_CRASH_DUMP
 649         if (OLDMEM_BASE)
 650                 /* Forget all memory above the running kdump system */
 651                 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
 652 #endif
 653 }
 654 
 655 /*
 656  * Make sure that oldmem, where the dump is stored, is protected
 657  */
 658 static void remove_oldmem(void)
 659 {
 660 #ifdef CONFIG_CRASH_DUMP
 661         if (OLDMEM_BASE)
 662                 /* Forget all memory above the running kdump system */
 663                 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
 664 #endif
 665 }
 666 
 667 /*
 668  * Reserve memory for kdump kernel to be loaded with kexec
 669  */
 670 static void __init reserve_crashkernel(void)
 671 {
 672 #ifdef CONFIG_CRASH_DUMP
 673         unsigned long long crash_base, crash_size;
 674         phys_addr_t low, high;
 675         int rc;
 676 
 677         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 678                                &crash_base);
 679 
 680         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 681         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 682         if (rc || crash_size == 0)
 683                 return;
 684 
 685         if (memblock.memory.regions[0].size < crash_size) {
 686                 pr_info("crashkernel reservation failed: %s\n",
 687                         "first memory chunk must be at least crashkernel size");
 688                 return;
 689         }
 690 
 691         low = crash_base ?: OLDMEM_BASE;
 692         high = low + crash_size;
 693         if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
 694                 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
 695                 crash_base = low;
 696         } else {
 697                 /* Find suitable area in free memory */
 698                 low = max_t(unsigned long, crash_size, sclp.hsa_size);
 699                 high = crash_base ? crash_base + crash_size : ULONG_MAX;
 700 
 701                 if (crash_base && crash_base < low) {
 702                         pr_info("crashkernel reservation failed: %s\n",
 703                                 "crash_base too low");
 704                         return;
 705                 }
 706                 low = crash_base ?: low;
 707                 crash_base = memblock_find_in_range(low, high, crash_size,
 708                                                     KEXEC_CRASH_MEM_ALIGN);
 709         }
 710 
 711         if (!crash_base) {
 712                 pr_info("crashkernel reservation failed: %s\n",
 713                         "no suitable area found");
 714                 return;
 715         }
 716 
 717         if (register_memory_notifier(&kdump_mem_nb))
 718                 return;
 719 
 720         if (!OLDMEM_BASE && MACHINE_IS_VM)
 721                 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
 722         crashk_res.start = crash_base;
 723         crashk_res.end = crash_base + crash_size - 1;
 724         memblock_remove(crash_base, crash_size);
 725         pr_info("Reserving %lluMB of memory at %lluMB "
 726                 "for crashkernel (System RAM: %luMB)\n",
 727                 crash_size >> 20, crash_base >> 20,
 728                 (unsigned long)memblock.memory.total_size >> 20);
 729         os_info_crashkernel_add(crash_base, crash_size);
 730 #endif
 731 }
 732 
 733 /*
 734  * Reserve the initrd from being used by memblock
 735  */
 736 static void __init reserve_initrd(void)
 737 {
 738 #ifdef CONFIG_BLK_DEV_INITRD
 739         if (!INITRD_START || !INITRD_SIZE)
 740                 return;
 741         initrd_start = INITRD_START;
 742         initrd_end = initrd_start + INITRD_SIZE;
 743         memblock_reserve(INITRD_START, INITRD_SIZE);
 744 #endif
 745 }
 746 
 747 /*
 748  * Reserve the memory area used to pass the certificate lists
 749  */
 750 static void __init reserve_certificate_list(void)
 751 {
 752         if (ipl_cert_list_addr)
 753                 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
 754 }
 755 
 756 static void __init reserve_mem_detect_info(void)
 757 {
 758         unsigned long start, size;
 759 
 760         get_mem_detect_reserved(&start, &size);
 761         if (size)
 762                 memblock_reserve(start, size);
 763 }
 764 
 765 static void __init free_mem_detect_info(void)
 766 {
 767         unsigned long start, size;
 768 
 769         get_mem_detect_reserved(&start, &size);
 770         if (size)
 771                 memblock_free(start, size);
 772 }
 773 
 774 static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
 775 {
 776         memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
 777                      start, start + size - 1);
 778         memblock_add_range(&memblock.memory, start, size, 0, 0);
 779         memblock_add_range(&memblock.physmem, start, size, 0, 0);
 780 }
 781 
 782 static const char * __init get_mem_info_source(void)
 783 {
 784         switch (mem_detect.info_source) {
 785         case MEM_DETECT_SCLP_STOR_INFO:
 786                 return "sclp storage info";
 787         case MEM_DETECT_DIAG260:
 788                 return "diag260";
 789         case MEM_DETECT_SCLP_READ_INFO:
 790                 return "sclp read info";
 791         case MEM_DETECT_BIN_SEARCH:
 792                 return "binary search";
 793         }
 794         return "none";
 795 }
 796 
 797 static void __init memblock_add_mem_detect_info(void)
 798 {
 799         unsigned long start, end;
 800         int i;
 801 
 802         memblock_dbg("physmem info source: %s (%hhd)\n",
 803                      get_mem_info_source(), mem_detect.info_source);
 804         /* keep memblock lists close to the kernel */
 805         memblock_set_bottom_up(true);
 806         for_each_mem_detect_block(i, &start, &end)
 807                 memblock_physmem_add(start, end - start);
 808         memblock_set_bottom_up(false);
 809         memblock_dump_all();
 810 }
 811 
 812 /*
 813  * Check for initrd being in usable memory
 814  */
 815 static void __init check_initrd(void)
 816 {
 817 #ifdef CONFIG_BLK_DEV_INITRD
 818         if (INITRD_START && INITRD_SIZE &&
 819             !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
 820                 pr_err("The initial RAM disk does not fit into the memory\n");
 821                 memblock_free(INITRD_START, INITRD_SIZE);
 822                 initrd_start = initrd_end = 0;
 823         }
 824 #endif
 825 }
 826 
 827 /*
 828  * Reserve memory used for lowcore/command line/kernel image.
 829  */
 830 static void __init reserve_kernel(void)
 831 {
 832         unsigned long start_pfn = PFN_UP(__pa(_end));
 833 
 834         memblock_reserve(0, HEAD_END);
 835         memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
 836                          - (unsigned long)_stext);
 837         memblock_reserve(__sdma, __edma - __sdma);
 838 }
 839 
 840 static void __init setup_memory(void)
 841 {
 842         struct memblock_region *reg;
 843 
 844         /*
 845          * Init storage key for present memory
 846          */
 847         for_each_memblock(memory, reg) {
 848                 storage_key_init_range(reg->base, reg->base + reg->size);
 849         }
 850         psw_set_key(PAGE_DEFAULT_KEY);
 851 
 852         /* Only cosmetics */
 853         memblock_enforce_memory_limit(memblock_end_of_DRAM());
 854 }
 855 
 856 /*
 857  * Setup hardware capabilities.
 858  */
 859 static int __init setup_hwcaps(void)
 860 {
 861         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 862         struct cpuid cpu_id;
 863         int i;
 864 
 865         /*
 866          * The store facility list bits numbers as found in the principles
 867          * of operation are numbered with bit 1UL<<31 as number 0 to
 868          * bit 1UL<<0 as number 31.
 869          *   Bit 0: instructions named N3, "backported" to esa-mode
 870          *   Bit 2: z/Architecture mode is active
 871          *   Bit 7: the store-facility-list-extended facility is installed
 872          *   Bit 17: the message-security assist is installed
 873          *   Bit 19: the long-displacement facility is installed
 874          *   Bit 21: the extended-immediate facility is installed
 875          *   Bit 22: extended-translation facility 3 is installed
 876          *   Bit 30: extended-translation facility 3 enhancement facility
 877          * These get translated to:
 878          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 879          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 880          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 881          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 882          */
 883         for (i = 0; i < 6; i++)
 884                 if (test_facility(stfl_bits[i]))
 885                         elf_hwcap |= 1UL << i;
 886 
 887         if (test_facility(22) && test_facility(30))
 888                 elf_hwcap |= HWCAP_S390_ETF3EH;
 889 
 890         /*
 891          * Check for additional facilities with store-facility-list-extended.
 892          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 893          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 894          * as stored by stfl, bits 32-xxx contain additional facilities.
 895          * How many facility words are stored depends on the number of
 896          * doublewords passed to the instruction. The additional facilities
 897          * are:
 898          *   Bit 42: decimal floating point facility is installed
 899          *   Bit 44: perform floating point operation facility is installed
 900          * translated to:
 901          *   HWCAP_S390_DFP bit 6 (42 && 44).
 902          */
 903         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 904                 elf_hwcap |= HWCAP_S390_DFP;
 905 
 906         /*
 907          * Huge page support HWCAP_S390_HPAGE is bit 7.
 908          */
 909         if (MACHINE_HAS_EDAT1)
 910                 elf_hwcap |= HWCAP_S390_HPAGE;
 911 
 912         /*
 913          * 64-bit register support for 31-bit processes
 914          * HWCAP_S390_HIGH_GPRS is bit 9.
 915          */
 916         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 917 
 918         /*
 919          * Transactional execution support HWCAP_S390_TE is bit 10.
 920          */
 921         if (MACHINE_HAS_TE)
 922                 elf_hwcap |= HWCAP_S390_TE;
 923 
 924         /*
 925          * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
 926          * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
 927          * instead of facility bit 129.
 928          */
 929         if (MACHINE_HAS_VX) {
 930                 elf_hwcap |= HWCAP_S390_VXRS;
 931                 if (test_facility(134))
 932                         elf_hwcap |= HWCAP_S390_VXRS_EXT;
 933                 if (test_facility(135))
 934                         elf_hwcap |= HWCAP_S390_VXRS_BCD;
 935                 if (test_facility(148))
 936                         elf_hwcap |= HWCAP_S390_VXRS_EXT2;
 937                 if (test_facility(152))
 938                         elf_hwcap |= HWCAP_S390_VXRS_PDE;
 939         }
 940         if (test_facility(150))
 941                 elf_hwcap |= HWCAP_S390_SORT;
 942         if (test_facility(151))
 943                 elf_hwcap |= HWCAP_S390_DFLT;
 944 
 945         /*
 946          * Guarded storage support HWCAP_S390_GS is bit 12.
 947          */
 948         if (MACHINE_HAS_GS)
 949                 elf_hwcap |= HWCAP_S390_GS;
 950 
 951         get_cpu_id(&cpu_id);
 952         add_device_randomness(&cpu_id, sizeof(cpu_id));
 953         switch (cpu_id.machine) {
 954         case 0x2064:
 955         case 0x2066:
 956         default:        /* Use "z900" as default for 64 bit kernels. */
 957                 strcpy(elf_platform, "z900");
 958                 break;
 959         case 0x2084:
 960         case 0x2086:
 961                 strcpy(elf_platform, "z990");
 962                 break;
 963         case 0x2094:
 964         case 0x2096:
 965                 strcpy(elf_platform, "z9-109");
 966                 break;
 967         case 0x2097:
 968         case 0x2098:
 969                 strcpy(elf_platform, "z10");
 970                 break;
 971         case 0x2817:
 972         case 0x2818:
 973                 strcpy(elf_platform, "z196");
 974                 break;
 975         case 0x2827:
 976         case 0x2828:
 977                 strcpy(elf_platform, "zEC12");
 978                 break;
 979         case 0x2964:
 980         case 0x2965:
 981                 strcpy(elf_platform, "z13");
 982                 break;
 983         case 0x3906:
 984         case 0x3907:
 985                 strcpy(elf_platform, "z14");
 986                 break;
 987         case 0x8561:
 988         case 0x8562:
 989                 strcpy(elf_platform, "z15");
 990                 break;
 991         }
 992 
 993         /*
 994          * Virtualization support HWCAP_INT_SIE is bit 0.
 995          */
 996         if (sclp.has_sief2)
 997                 int_hwcap |= HWCAP_INT_SIE;
 998 
 999         return 0;
1000 }
1001 arch_initcall(setup_hwcaps);
1002 
1003 /*
1004  * Add system information as device randomness
1005  */
1006 static void __init setup_randomness(void)
1007 {
1008         struct sysinfo_3_2_2 *vmms;
1009 
1010         vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
1011                                                             PAGE_SIZE);
1012         if (!vmms)
1013                 panic("Failed to allocate memory for sysinfo structure\n");
1014 
1015         if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
1016                 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
1017         memblock_free((unsigned long) vmms, PAGE_SIZE);
1018 }
1019 
1020 /*
1021  * Find the correct size for the task_struct. This depends on
1022  * the size of the struct fpu at the end of the thread_struct
1023  * which is embedded in the task_struct.
1024  */
1025 static void __init setup_task_size(void)
1026 {
1027         int task_size = sizeof(struct task_struct);
1028 
1029         if (!MACHINE_HAS_VX) {
1030                 task_size -= sizeof(__vector128) * __NUM_VXRS;
1031                 task_size += sizeof(freg_t) * __NUM_FPRS;
1032         }
1033         arch_task_struct_size = task_size;
1034 }
1035 
1036 /*
1037  * Issue diagnose 318 to set the control program name and
1038  * version codes.
1039  */
1040 static void __init setup_control_program_code(void)
1041 {
1042         union diag318_info diag318_info = {
1043                 .cpnc = CPNC_LINUX,
1044                 .cpvc_linux = 0,
1045                 .cpvc_distro = {0},
1046         };
1047 
1048         if (!sclp.has_diag318)
1049                 return;
1050 
1051         diag_stat_inc(DIAG_STAT_X318);
1052         asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1053 }
1054 
1055 /*
1056  * Print the component list from the IPL report
1057  */
1058 static void __init log_component_list(void)
1059 {
1060         struct ipl_rb_component_entry *ptr, *end;
1061         char *str;
1062 
1063         if (!early_ipl_comp_list_addr)
1064                 return;
1065         if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
1066                 pr_info("Linux is running with Secure-IPL enabled\n");
1067         else
1068                 pr_info("Linux is running with Secure-IPL disabled\n");
1069         ptr = (void *) early_ipl_comp_list_addr;
1070         end = (void *) ptr + early_ipl_comp_list_size;
1071         pr_info("The IPL report contains the following components:\n");
1072         while (ptr < end) {
1073                 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1074                         if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1075                                 str = "signed, verified";
1076                         else
1077                                 str = "signed, verification failed";
1078                 } else {
1079                         str = "not signed";
1080                 }
1081                 pr_info("%016llx - %016llx (%s)\n",
1082                         ptr->addr, ptr->addr + ptr->len, str);
1083                 ptr++;
1084         }
1085 }
1086 
1087 /*
1088  * Setup function called from init/main.c just after the banner
1089  * was printed.
1090  */
1091 
1092 void __init setup_arch(char **cmdline_p)
1093 {
1094         /*
1095          * print what head.S has found out about the machine
1096          */
1097         if (MACHINE_IS_VM)
1098                 pr_info("Linux is running as a z/VM "
1099                         "guest operating system in 64-bit mode\n");
1100         else if (MACHINE_IS_KVM)
1101                 pr_info("Linux is running under KVM in 64-bit mode\n");
1102         else if (MACHINE_IS_LPAR)
1103                 pr_info("Linux is running natively in 64-bit mode\n");
1104         else
1105                 pr_info("Linux is running as a guest in 64-bit mode\n");
1106 
1107         log_component_list();
1108 
1109         /* Have one command line that is parsed and saved in /proc/cmdline */
1110         /* boot_command_line has been already set up in early.c */
1111         *cmdline_p = boot_command_line;
1112 
1113         ROOT_DEV = Root_RAM0;
1114 
1115         init_mm.start_code = (unsigned long) _text;
1116         init_mm.end_code = (unsigned long) _etext;
1117         init_mm.end_data = (unsigned long) _edata;
1118         init_mm.brk = (unsigned long) _end;
1119 
1120         if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1121                 nospec_auto_detect();
1122 
1123         parse_early_param();
1124 #ifdef CONFIG_CRASH_DUMP
1125         /* Deactivate elfcorehdr= kernel parameter */
1126         elfcorehdr_addr = ELFCORE_ADDR_MAX;
1127 #endif
1128 
1129         os_info_init();
1130         setup_ipl();
1131         setup_task_size();
1132         setup_control_program_code();
1133 
1134         /* Do some memory reservations *before* memory is added to memblock */
1135         reserve_memory_end();
1136         reserve_oldmem();
1137         reserve_kernel();
1138         reserve_initrd();
1139         reserve_certificate_list();
1140         reserve_mem_detect_info();
1141         memblock_allow_resize();
1142 
1143         /* Get information about *all* installed memory */
1144         memblock_add_mem_detect_info();
1145 
1146         free_mem_detect_info();
1147         remove_oldmem();
1148 
1149         /*
1150          * Make sure all chunks are MAX_ORDER aligned so we don't need the
1151          * extra checks that HOLES_IN_ZONE would require.
1152          *
1153          * Is this still required?
1154          */
1155         memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
1156 
1157         setup_memory_end();
1158         setup_memory();
1159         dma_contiguous_reserve(memory_end);
1160         vmcp_cma_reserve();
1161 
1162         check_initrd();
1163         reserve_crashkernel();
1164 #ifdef CONFIG_CRASH_DUMP
1165         /*
1166          * Be aware that smp_save_dump_cpus() triggers a system reset.
1167          * Therefore CPU and device initialization should be done afterwards.
1168          */
1169         smp_save_dump_cpus();
1170 #endif
1171 
1172         setup_resources();
1173         setup_lowcore_dat_off();
1174         smp_fill_possible_mask();
1175         cpu_detect_mhz_feature();
1176         cpu_init();
1177         numa_setup();
1178         smp_detect_cpus();
1179         topology_init_early();
1180 
1181         /*
1182          * Create kernel page tables and switch to virtual addressing.
1183          */
1184         paging_init();
1185 
1186         /*
1187          * After paging_init created the kernel page table, the new PSWs
1188          * in lowcore can now run with DAT enabled.
1189          */
1190         setup_lowcore_dat_on();
1191 
1192         /* Setup default console */
1193         conmode_default();
1194         set_preferred_console();
1195 
1196         apply_alternative_instructions();
1197         if (IS_ENABLED(CONFIG_EXPOLINE))
1198                 nospec_init_branches();
1199 
1200         /* Setup zfcpdump support */
1201         setup_zfcpdump();
1202 
1203         /* Add system specific data to the random pool */
1204         setup_randomness();
1205 }
/* [<][>][^][v][top][bottom][index][help] */
root/arch/s390/kernel/setup.c

DEFINITIONS
