arch/s390/kernel/setup.c

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 1999, 2012
   4  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   5  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   6  *
   7  *  Derived from "arch/i386/kernel/setup.c"
   8  *    Copyright (C) 1995, Linus Torvalds
   9  */
  10
  11 /*
  12  * This file handles the architecture-dependent parts of initialization
  13  */
  14
  15 #define KMSG_COMPONENT "setup"
  16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  17
  18 #include <linux/errno.h>
  19 #include <linux/export.h>
  20 #include <linux/sched.h>
  21 #include <linux/kernel.h>
  22 #include <linux/memblock.h>
  23 #include <linux/mm.h>
  24 #include <linux/stddef.h>
  25 #include <linux/unistd.h>
  26 #include <linux/ptrace.h>
  27 #include <linux/user.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/root_dev.h>
  35 #include <linux/console.h>
  36 #include <linux/kernel_stat.h>
  37 #include <linux/device.h>
  38 #include <linux/notifier.h>
  39 #include <linux/pfn.h>
  40 #include <linux/ctype.h>
  41 #include <linux/reboot.h>
  42 #include <linux/topology.h>
  43 #include <linux/ftrace.h>
  44 #include <linux/kexec.h>
  45 #include <linux/crash_dump.h>
  46 #include <linux/memory.h>
  47 #include <linux/compat.h>
  48
  49 #include <asm/ipl.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/facility.h>
  52 #include <asm/smp.h>
  53 #include <asm/mmu_context.h>
  54 #include <asm/cpcmd.h>
  55 #include <asm/lowcore.h>
  56 #include <asm/irq.h>
  57 #include <asm/page.h>
  58 #include <asm/ptrace.h>
  59 #include <asm/sections.h>
  60 #include <asm/ebcdic.h>
  61 #include <asm/kvm_virtio.h>
  62 #include <asm/diag.h>
  63 #include <asm/os_info.h>
  64 #include <asm/sclp.h>
  65 #include "entry.h"
  66
  67 /*
  68  * User copy operations.
  69  */
  70 struct uaccess_ops uaccess;
  71 EXPORT_SYMBOL(uaccess);
  72
  73 /*
  74  * Machine setup..
  75  */
  76 unsigned int console_mode = 0;
  77 EXPORT_SYMBOL(console_mode);
  78
  79 unsigned int console_devno = -1;
  80 EXPORT_SYMBOL(console_devno);
  81
  82 unsigned int console_irq = -1;
  83 EXPORT_SYMBOL(console_irq);
  84
  85 unsigned long elf_hwcap = 0;
  86 char elf_platform[ELF_PLATFORM_SIZE];
  87
  88 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  89
  90 int __initdata memory_end_set;
  91 unsigned long __initdata memory_end;
  92
  93 unsigned long VMALLOC_START;
  94 EXPORT_SYMBOL(VMALLOC_START);
  95
  96 unsigned long VMALLOC_END;
  97 EXPORT_SYMBOL(VMALLOC_END);
  98
  99 struct page *vmemmap;
 100 EXPORT_SYMBOL(vmemmap);
 101
 102 #ifdef CONFIG_64BIT
 103 unsigned long MODULES_VADDR;
 104 unsigned long MODULES_END;
 105 #endif
 106
 107 /* An array with a pointer to the lowcore of every CPU. */
 108 struct _lowcore *lowcore_ptr[NR_CPUS];
 109 EXPORT_SYMBOL(lowcore_ptr);
 110
 111 /*
 112  * This is set up by the setup-routine at boot-time
 113  * for S390 need to find out, what we have to setup
 114  * using address 0x10400 ...
 115  */
 116
 117 #include <asm/setup.h>
 118
 119 /*
 120  * condev= and conmode= setup parameter.
 121  */
 122
 123 static int __init condev_setup(char *str)
 124 {
 125         int vdev;
 126
 127         vdev = simple_strtoul(str, &str, 0);
 128         if (vdev >= 0 && vdev < 65536) {
 129                 console_devno = vdev;
 130                 console_irq = -1;
 131         }
 132         return 1;
 133 }
 134
 135 __setup("condev=", condev_setup);
 136
 137 static void __init set_preferred_console(void)
 138 {
 139         if (MACHINE_IS_KVM) {
 140                 if (sclp_has_vt220())
 141                         add_preferred_console("ttyS", 1, NULL);
 142                 else if (sclp_has_linemode())
 143                         add_preferred_console("ttyS", 0, NULL);
 144                 else
 145                         add_preferred_console("hvc", 0, NULL);
 146         } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 147                 add_preferred_console("ttyS", 0, NULL);
 148         else if (CONSOLE_IS_3270)
 149                 add_preferred_console("tty3270", 0, NULL);
 150 }
 151
 152 static int __init conmode_setup(char *str)
 153 {
 154 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 155         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 156                 SET_CONSOLE_SCLP;
 157 #endif
 158 #if defined(CONFIG_TN3215_CONSOLE)
 159         if (strncmp(str, "3215", 5) == 0)
 160                 SET_CONSOLE_3215;
 161 #endif
 162 #if defined(CONFIG_TN3270_CONSOLE)
 163         if (strncmp(str, "3270", 5) == 0)
 164                 SET_CONSOLE_3270;
 165 #endif
 166         set_preferred_console();
 167         return 1;
 168 }
 169
 170 __setup("conmode=", conmode_setup);
 171
 172 static void __init conmode_default(void)
 173 {
 174         char query_buffer[1024];
 175         char *ptr;
 176
 177         if (MACHINE_IS_VM) {
 178                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 179                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 180                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 181                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 182                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 183                 ptr = strstr(query_buffer, "CONMODE");
 184                 /*
 185                  * Set the conmode to 3215 so that the device recognition
 186                  * will set the cu_type of the console to 3215. If the
 187                  * conmode is 3270 and we don't set it back then both
 188                  * 3215 and the 3270 driver will try to access the console
 189                  * device (3215 as console and 3270 as normal tty).
 190                  */
 191                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 192                 if (ptr == NULL) {
 193 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 194                         SET_CONSOLE_SCLP;
 195 #endif
 196                         return;
 197                 }
 198                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 199 #if defined(CONFIG_TN3270_CONSOLE)
 200                         SET_CONSOLE_3270;
 201 #elif defined(CONFIG_TN3215_CONSOLE)
 202                         SET_CONSOLE_3215;
 203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 204                         SET_CONSOLE_SCLP;
 205 #endif
 206                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 207 #if defined(CONFIG_TN3215_CONSOLE)
 208                         SET_CONSOLE_3215;
 209 #elif defined(CONFIG_TN3270_CONSOLE)
 210                         SET_CONSOLE_3270;
 211 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 212                         SET_CONSOLE_SCLP;
 213 #endif
 214                 }
 215         } else {
 216 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 217                 SET_CONSOLE_SCLP;
 218 #endif
 219         }
 220 }
 221
 222 #ifdef CONFIG_ZFCPDUMP
 223 static void __init setup_zfcpdump(void)
 224 {
 225         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 226                 return;
 227         if (OLDMEM_BASE)
 228                 return;
 229         strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
 230         console_loglevel = 2;
 231 }
 232 #else
 233 static inline void setup_zfcpdump(void) {}
 234 #endif /* CONFIG_ZFCPDUMP */
 235
 236  /*
 237  * Reboot, halt and power_off stubs. They just call _machine_restart,
 238  * _machine_halt or _machine_power_off.
 239  */
 240
 241 void machine_restart(char *command)
 242 {
 243         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 244                 /*
 245                  * Only unblank the console if we are called in enabled
 246                  * context or a bust_spinlocks cleared the way for us.
 247                  */
 248                 console_unblank();
 249         _machine_restart(command);
 250 }
 251
 252 void machine_halt(void)
 253 {
 254         if (!in_interrupt() || oops_in_progress)
 255                 /*
 256                  * Only unblank the console if we are called in enabled
 257                  * context or a bust_spinlocks cleared the way for us.
 258                  */
 259                 console_unblank();
 260         _machine_halt();
 261 }
 262
 263 void machine_power_off(void)
 264 {
 265         if (!in_interrupt() || oops_in_progress)
 266                 /*
 267                  * Only unblank the console if we are called in enabled
 268                  * context or a bust_spinlocks cleared the way for us.
 269                  */
 270                 console_unblank();
 271         _machine_power_off();
 272 }
 273
 274 /*
 275  * Dummy power off function.
 276  */
 277 void (*pm_power_off)(void) = machine_power_off;
 278 EXPORT_SYMBOL_GPL(pm_power_off);
 279
 280 static int __init early_parse_mem(char *p)
 281 {
 282         memory_end = memparse(p, &p);
 283         memory_end_set = 1;
 284         return 0;
 285 }
 286 early_param("mem", early_parse_mem);
 287
 288 static int __init parse_vmalloc(char *arg)
 289 {
 290         if (!arg)
 291                 return -EINVAL;
 292         VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
 293         return 0;
 294 }
 295 early_param("vmalloc", parse_vmalloc);
 296
 297 static int __init early_parse_user_mode(char *p)
 298 {
 299         if (!p || strcmp(p, "primary") == 0)
 300                 return 0;
 301         return 1;
 302 }
 303 early_param("user_mode", early_parse_user_mode);
 304
 305 void *restart_stack __attribute__((__section__(".data")));
 306
 307 static void __init setup_lowcore(void)
 308 {
 309         struct _lowcore *lc;
 310
 311         /*
 312          * Setup lowcore for boot cpu
 313          */
 314         BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
 315         lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
 316         lc->restart_psw.mask = PSW_KERNEL_BITS;
 317         lc->restart_psw.addr =
 318                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 319         lc->external_new_psw.mask = PSW_KERNEL_BITS |
 320                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 321         lc->external_new_psw.addr =
 322                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 323         lc->svc_new_psw.mask = PSW_KERNEL_BITS |
 324                 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 325         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 326         lc->program_new_psw.mask = PSW_KERNEL_BITS |
 327                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 328         lc->program_new_psw.addr =
 329                 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
 330         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 331         lc->mcck_new_psw.addr =
 332                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 333         lc->io_new_psw.mask = PSW_KERNEL_BITS |
 334                 PSW_MASK_DAT | PSW_MASK_MCHECK;
 335         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 336         lc->clock_comparator = -1ULL;
 337         lc->kernel_stack = ((unsigned long) &init_thread_union)
 338                 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 339         lc->async_stack = (unsigned long)
 340                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
 341                 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 342         lc->panic_stack = (unsigned long)
 343                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
 344                 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 345         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 346         lc->thread_info = (unsigned long) &init_thread_union;
 347         lc->machine_flags = S390_lowcore.machine_flags;
 348         lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
 349         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 350                MAX_FACILITY_BIT/8);
 351 #ifndef CONFIG_64BIT
 352         if (MACHINE_HAS_IEEE) {
 353                 lc->extended_save_area_addr = (__u32)
 354                         __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
 355                 /* enable extended save area */
 356                 __ctl_set_bit(14, 29);
 357         }
 358 #else
 359         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 360 #endif
 361         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 362         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 363         lc->exit_timer = S390_lowcore.exit_timer;
 364         lc->user_timer = S390_lowcore.user_timer;
 365         lc->system_timer = S390_lowcore.system_timer;
 366         lc->steal_timer = S390_lowcore.steal_timer;
 367         lc->last_update_timer = S390_lowcore.last_update_timer;
 368         lc->last_update_clock = S390_lowcore.last_update_clock;
 369         lc->ftrace_func = S390_lowcore.ftrace_func;
 370
 371         restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
 372         restart_stack += ASYNC_SIZE;
 373
 374         /*
 375          * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 376          * restart data to the absolute zero lowcore. This is necesary if
 377          * PSW restart is done on an offline CPU that has lowcore zero.
 378          */
 379         lc->restart_stack = (unsigned long) restart_stack;
 380         lc->restart_fn = (unsigned long) do_restart;
 381         lc->restart_data = 0;
 382         lc->restart_source = -1UL;
 383
 384         /* Setup absolute zero lowcore */
 385         mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
 386         mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
 387         mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
 388         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
 389         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
 390
 391         set_prefix((u32)(unsigned long) lc);
 392         lowcore_ptr[0] = lc;
 393 }
 394
 395 static struct resource code_resource = {
 396         .name  = "Kernel code",
 397         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 398 };
 399
 400 static struct resource data_resource = {
 401         .name = "Kernel data",
 402         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 403 };
 404
 405 static struct resource bss_resource = {
 406         .name = "Kernel bss",
 407         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 408 };
 409
 410 static struct resource __initdata *standard_resources[] = {
 411         &code_resource,
 412         &data_resource,
 413         &bss_resource,
 414 };
 415
 416 static void __init setup_resources(void)
 417 {
 418         struct resource *res, *std_res, *sub_res;
 419         int i, j;
 420
 421         code_resource.start = (unsigned long) &_text;
 422         code_resource.end = (unsigned long) &_etext - 1;
 423         data_resource.start = (unsigned long) &_etext;
 424         data_resource.end = (unsigned long) &_edata - 1;
 425         bss_resource.start = (unsigned long) &__bss_start;
 426         bss_resource.end = (unsigned long) &__bss_stop - 1;
 427
 428         for (i = 0; i < MEMORY_CHUNKS; i++) {
 429                 if (!memory_chunk[i].size)
 430                         continue;
 431                 res = alloc_bootmem_low(sizeof(*res));
 432                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 433                 switch (memory_chunk[i].type) {
 434                 case CHUNK_READ_WRITE:
 435                         res->name = "System RAM";
 436                         break;
 437                 case CHUNK_READ_ONLY:
 438                         res->name = "System ROM";
 439                         res->flags |= IORESOURCE_READONLY;
 440                         break;
 441                 default:
 442                         res->name = "reserved";
 443                 }
 444                 res->start = memory_chunk[i].addr;
 445                 res->end = res->start + memory_chunk[i].size - 1;
 446                 request_resource(&iomem_resource, res);
 447
 448                 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
 449                         std_res = standard_resources[j];
 450                         if (std_res->start < res->start ||
 451                             std_res->start > res->end)
 452                                 continue;
 453                         if (std_res->end > res->end) {
 454                                 sub_res = alloc_bootmem_low(sizeof(*sub_res));
 455                                 *sub_res = *std_res;
 456                                 sub_res->end = res->end;
 457                                 std_res->start = res->end + 1;
 458                                 request_resource(res, sub_res);
 459                         } else {
 460                                 request_resource(res, std_res);
 461                         }
 462                 }
 463         }
 464 }
 465
 466 static void __init setup_memory_end(void)
 467 {
 468         unsigned long vmax, vmalloc_size, tmp;
 469         unsigned long real_memory_size = 0;
 470         int i;
 471
 472
 473 #ifdef CONFIG_ZFCPDUMP
 474         if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
 475                 memory_end = ZFCPDUMP_HSA_SIZE;
 476                 memory_end_set = 1;
 477         }
 478 #endif
 479         memory_end &= PAGE_MASK;
 480
 481         /*
 482          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 483          * extra checks that HOLES_IN_ZONE would require.
 484          */
 485         for (i = 0; i < MEMORY_CHUNKS; i++) {
 486                 unsigned long start, end;
 487                 struct mem_chunk *chunk;
 488                 unsigned long align;
 489
 490                 chunk = &memory_chunk[i];
 491                 if (!chunk->size)
 492                         continue;
 493                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 494                 start = (chunk->addr + align - 1) & ~(align - 1);
 495                 end = (chunk->addr + chunk->size) & ~(align - 1);
 496                 if (start >= end)
 497                         memset(chunk, 0, sizeof(*chunk));
 498                 else {
 499                         chunk->addr = start;
 500                         chunk->size = end - start;
 501                 }
 502                 real_memory_size = max(real_memory_size,
 503                                        chunk->addr + chunk->size);
 504         }
 505
 506         /* Choose kernel address space layout: 2, 3, or 4 levels. */
 507 #ifdef CONFIG_64BIT
 508         vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
 509         tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
 510         tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
 511         if (tmp <= (1UL << 42))
 512                 vmax = 1UL << 42;       /* 3-level kernel page table */
 513         else
 514                 vmax = 1UL << 53;       /* 4-level kernel page table */
 515         /* module area is at the end of the kernel address space. */
 516         MODULES_END = vmax;
 517         MODULES_VADDR = MODULES_END - MODULES_LEN;
 518         VMALLOC_END = MODULES_VADDR;
 519 #else
 520         vmalloc_size = VMALLOC_END ?: 96UL << 20;
 521         vmax = 1UL << 31;               /* 2-level kernel page table */
 522         /* vmalloc area is at the end of the kernel address space. */
 523         VMALLOC_END = vmax;
 524 #endif
 525         VMALLOC_START = vmax - vmalloc_size;
 526
 527         /* Split remaining virtual space between 1:1 mapping & vmemmap array */
 528         tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
 529         /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
 530         tmp = SECTION_ALIGN_UP(tmp);
 531         tmp = VMALLOC_START - tmp * sizeof(struct page);
 532         tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
 533         tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
 534         vmemmap = (struct page *) tmp;
 535
 536         /* Take care that memory_end is set and <= vmemmap */
 537         memory_end = min(memory_end ?: real_memory_size, tmp);
 538
 539         /* Fixup memory chunk array to fit into 0..memory_end */
 540         for (i = 0; i < MEMORY_CHUNKS; i++) {
 541                 struct mem_chunk *chunk = &memory_chunk[i];
 542
 543                 if (!chunk->size)
 544                         continue;
 545                 if (chunk->addr >= memory_end) {
 546                         memset(chunk, 0, sizeof(*chunk));
 547                         continue;
 548                 }
 549                 if (chunk->addr + chunk->size > memory_end)
 550                         chunk->size = memory_end - chunk->addr;
 551         }
 552 }
 553
 554 static void __init setup_vmcoreinfo(void)
 555 {
 556         mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
 557 }
 558
 559 #ifdef CONFIG_CRASH_DUMP
 560
 561 /*
 562  * Find suitable location for crashkernel memory
 563  */
 564 static unsigned long __init find_crash_base(unsigned long crash_size,
 565                                             char **msg)
 566 {
 567         unsigned long crash_base;
 568         struct mem_chunk *chunk;
 569         int i;
 570
 571         if (memory_chunk[0].size < crash_size) {
 572                 *msg = "first memory chunk must be at least crashkernel size";
 573                 return 0;
 574         }
 575         if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
 576                 return OLDMEM_BASE;
 577
 578         for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
 579                 chunk = &memory_chunk[i];
 580                 if (chunk->size == 0)
 581                         continue;
 582                 if (chunk->type != CHUNK_READ_WRITE)
 583                         continue;
 584                 if (chunk->size < crash_size)
 585                         continue;
 586                 crash_base = (chunk->addr + chunk->size) - crash_size;
 587                 if (crash_base < crash_size)
 588                         continue;
 589                 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
 590                         continue;
 591                 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
 592                         continue;
 593                 return crash_base;
 594         }
 595         *msg = "no suitable area found";
 596         return 0;
 597 }
 598
 599 /*
 600  * Check if crash_base and crash_size is valid
 601  */
 602 static int __init verify_crash_base(unsigned long crash_base,
 603                                     unsigned long crash_size,
 604                                     char **msg)
 605 {
 606         struct mem_chunk *chunk;
 607         int i;
 608
 609         /*
 610          * Because we do the swap to zero, we must have at least 'crash_size'
 611          * bytes free space before crash_base
 612          */
 613         if (crash_size > crash_base) {
 614                 *msg = "crashkernel offset must be greater than size";
 615                 return -EINVAL;
 616         }
 617
 618         /* First memory chunk must be at least crash_size */
 619         if (memory_chunk[0].size < crash_size) {
 620                 *msg = "first memory chunk must be at least crashkernel size";
 621                 return -EINVAL;
 622         }
 623         /* Check if we fit into the respective memory chunk */
 624         for (i = 0; i < MEMORY_CHUNKS; i++) {
 625                 chunk = &memory_chunk[i];
 626                 if (chunk->size == 0)
 627                         continue;
 628                 if (crash_base < chunk->addr)
 629                         continue;
 630                 if (crash_base >= chunk->addr + chunk->size)
 631                         continue;
 632                 /* we have found the memory chunk */
 633                 if (crash_base + crash_size > chunk->addr + chunk->size) {
 634                         *msg = "selected memory chunk is too small for "
 635                                 "crashkernel memory";
 636                         return -EINVAL;
 637                 }
 638                 return 0;
 639         }
 640         *msg = "invalid memory range specified";
 641         return -EINVAL;
 642 }
 643
 644 /*
 645  * When kdump is enabled, we have to ensure that no memory from
 646  * the area [0 - crashkernel memory size] and
 647  * [crashk_res.start - crashk_res.end] is set offline.
 648  */
 649 static int kdump_mem_notifier(struct notifier_block *nb,
 650                               unsigned long action, void *data)
 651 {
 652         struct memory_notify *arg = data;
 653
 654         if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
 655                 return NOTIFY_BAD;
 656         if (arg->start_pfn > PFN_DOWN(crashk_res.end))
 657                 return NOTIFY_OK;
 658         if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
 659                 return NOTIFY_OK;
 660         return NOTIFY_BAD;
 661 }
 662
 663 static struct notifier_block kdump_mem_nb = {
 664         .notifier_call = kdump_mem_notifier,
 665 };
 666
 667 #endif
 668
 669 /*
 670  * Make sure that oldmem, where the dump is stored, is protected
 671  */
 672 static void reserve_oldmem(void)
 673 {
 674 #ifdef CONFIG_CRASH_DUMP
 675         unsigned long real_size = 0;
 676         int i;
 677
 678         if (!OLDMEM_BASE)
 679                 return;
 680         for (i = 0; i < MEMORY_CHUNKS; i++) {
 681                 struct mem_chunk *chunk = &memory_chunk[i];
 682
 683                 real_size = max(real_size, chunk->addr + chunk->size);
 684         }
 685         create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE);
 686         create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE);
 687 #endif
 688 }
 689
 690 /*
 691  * Reserve memory for kdump kernel to be loaded with kexec
 692  */
 693 static void __init reserve_crashkernel(void)
 694 {
 695 #ifdef CONFIG_CRASH_DUMP
 696         unsigned long long crash_base, crash_size;
 697         char *msg = NULL;
 698         int rc;
 699
 700         rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
 701                                &crash_base);
 702         if (rc || crash_size == 0)
 703                 return;
 704         crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
 705         crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
 706         if (register_memory_notifier(&kdump_mem_nb))
 707                 return;
 708         if (!crash_base)
 709                 crash_base = find_crash_base(crash_size, &msg);
 710         if (!crash_base) {
 711                 pr_info("crashkernel reservation failed: %s\n", msg);
 712                 unregister_memory_notifier(&kdump_mem_nb);
 713                 return;
 714         }
 715         if (verify_crash_base(crash_base, crash_size, &msg)) {
 716                 pr_info("crashkernel reservation failed: %s\n", msg);
 717                 unregister_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         insert_resource(&iomem_resource, &crashk_res);
 725         create_mem_hole(memory_chunk, crash_base, crash_size);
 726         pr_info("Reserving %lluMB of memory at %lluMB "
 727                 "for crashkernel (System RAM: %luMB)\n",
 728                 crash_size >> 20, crash_base >> 20, memory_end >> 20);
 729         os_info_crashkernel_add(crash_base, crash_size);
 730 #endif
 731 }
 732
 733 static void __init setup_memory(void)
 734 {
 735         unsigned long bootmap_size;
 736         unsigned long start_pfn, end_pfn;
 737         int i;
 738
 739         /*
 740          * partially used pages are not usable - thus
 741          * we are rounding upwards:
 742          */
 743         start_pfn = PFN_UP(__pa(&_end));
 744         end_pfn = max_pfn = PFN_DOWN(memory_end);
 745
 746 #ifdef CONFIG_BLK_DEV_INITRD
 747         /*
 748          * Move the initrd in case the bitmap of the bootmem allocater
 749          * would overwrite it.
 750          */
 751
 752         if (INITRD_START && INITRD_SIZE) {
 753                 unsigned long bmap_size;
 754                 unsigned long start;
 755
 756                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 757                 bmap_size = PFN_PHYS(bmap_size);
 758
 759                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 760                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 761
 762 #ifdef CONFIG_CRASH_DUMP
 763                         if (OLDMEM_BASE) {
 764                                 /* Move initrd behind kdump oldmem */
 765                                 if (start + INITRD_SIZE > OLDMEM_BASE &&
 766                                     start < OLDMEM_BASE + OLDMEM_SIZE)
 767                                         start = OLDMEM_BASE + OLDMEM_SIZE;
 768                         }
 769 #endif
 770                         if (start + INITRD_SIZE > memory_end) {
 771                                 pr_err("initrd extends beyond end of "
 772                                        "memory (0x%08lx > 0x%08lx) "
 773                                        "disabling initrd\n",
 774                                        start + INITRD_SIZE, memory_end);
 775                                 INITRD_START = INITRD_SIZE = 0;
 776                         } else {
 777                                 pr_info("Moving initrd (0x%08lx -> "
 778                                         "0x%08lx, size: %ld)\n",
 779                                         INITRD_START, start, INITRD_SIZE);
 780                                 memmove((void *) start, (void *) INITRD_START,
 781                                         INITRD_SIZE);
 782                                 INITRD_START = start;
 783                         }
 784                 }
 785         }
 786 #endif
 787
 788         /*
 789          * Initialize the boot-time allocator
 790          */
 791         bootmap_size = init_bootmem(start_pfn, end_pfn);
 792
 793         /*
 794          * Register RAM areas with the bootmem allocator.
 795          */
 796
 797         for (i = 0; i < MEMORY_CHUNKS; i++) {
 798                 unsigned long start_chunk, end_chunk, pfn;
 799
 800                 if (!memory_chunk[i].size)
 801                         continue;
 802                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 803                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 804                 end_chunk = min(end_chunk, end_pfn);
 805                 if (start_chunk >= end_chunk)
 806                         continue;
 807                 memblock_add_node(PFN_PHYS(start_chunk),
 808                                   PFN_PHYS(end_chunk - start_chunk), 0);
 809                 pfn = max(start_chunk, start_pfn);
 810                 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
 811         }
 812
 813         psw_set_key(PAGE_DEFAULT_KEY);
 814
 815         free_bootmem_with_active_regions(0, max_pfn);
 816
 817         /*
 818          * Reserve memory used for lowcore/command line/kernel image.
 819          */
 820         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 821         reserve_bootmem((unsigned long)_stext,
 822                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 823                         BOOTMEM_DEFAULT);
 824         /*
 825          * Reserve the bootmem bitmap itself as well. We do this in two
 826          * steps (first step was init_bootmem()) because this catches
 827          * the (very unlikely) case of us accidentally initializing the
 828          * bootmem allocator with an invalid RAM area.
 829          */
 830         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 831                         BOOTMEM_DEFAULT);
 832
 833 #ifdef CONFIG_CRASH_DUMP
 834         if (crashk_res.start)
 835                 reserve_bootmem(crashk_res.start,
 836                                 crashk_res.end - crashk_res.start + 1,
 837                                 BOOTMEM_DEFAULT);
 838         if (is_kdump_kernel())
 839                 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
 840                                 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
 841 #endif
 842 #ifdef CONFIG_BLK_DEV_INITRD
 843         if (INITRD_START && INITRD_SIZE) {
 844                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 845                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 846                                         BOOTMEM_DEFAULT);
 847                         initrd_start = INITRD_START;
 848                         initrd_end = initrd_start + INITRD_SIZE;
 849                 } else {
 850                         pr_err("initrd extends beyond end of "
 851                                "memory (0x%08lx > 0x%08lx) "
 852                                "disabling initrd\n",
 853                                initrd_start + INITRD_SIZE, memory_end);
 854                         initrd_start = initrd_end = 0;
 855                 }
 856         }
 857 #endif
 858 }
 859
 860 /*
 861  * Setup hardware capabilities.
 862  */
 863 static void __init setup_hwcaps(void)
 864 {
 865         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 866         struct cpuid cpu_id;
 867         int i;
 868
 869         /*
 870          * The store facility list bits numbers as found in the principles
 871          * of operation are numbered with bit 1UL<<31 as number 0 to
 872          * bit 1UL<<0 as number 31.
 873          *   Bit 0: instructions named N3, "backported" to esa-mode
 874          *   Bit 2: z/Architecture mode is active
 875          *   Bit 7: the store-facility-list-extended facility is installed
 876          *   Bit 17: the message-security assist is installed
 877          *   Bit 19: the long-displacement facility is installed
 878          *   Bit 21: the extended-immediate facility is installed
 879          *   Bit 22: extended-translation facility 3 is installed
 880          *   Bit 30: extended-translation facility 3 enhancement facility
 881          * These get translated to:
 882          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 883          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 884          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 885          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 886          */
 887         for (i = 0; i < 6; i++)
 888                 if (test_facility(stfl_bits[i]))
 889                         elf_hwcap |= 1UL << i;
 890
 891         if (test_facility(22) && test_facility(30))
 892                 elf_hwcap |= HWCAP_S390_ETF3EH;
 893
 894         /*
 895          * Check for additional facilities with store-facility-list-extended.
 896          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 897          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 898          * as stored by stfl, bits 32-xxx contain additional facilities.
 899          * How many facility words are stored depends on the number of
 900          * doublewords passed to the instruction. The additional facilities
 901          * are:
 902          *   Bit 42: decimal floating point facility is installed
 903          *   Bit 44: perform floating point operation facility is installed
 904          * translated to:
 905          *   HWCAP_S390_DFP bit 6 (42 && 44).
 906          */
 907         if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
 908                 elf_hwcap |= HWCAP_S390_DFP;
 909
 910         /*
 911          * Huge page support HWCAP_S390_HPAGE is bit 7.
 912          */
 913         if (MACHINE_HAS_HPAGE)
 914                 elf_hwcap |= HWCAP_S390_HPAGE;
 915
 916 #if defined(CONFIG_64BIT)
 917         /*
 918          * 64-bit register support for 31-bit processes
 919          * HWCAP_S390_HIGH_GPRS is bit 9.
 920          */
 921         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 922
 923         /*
 924          * Transactional execution support HWCAP_S390_TE is bit 10.
 925          */
 926         if (test_facility(50) && test_facility(73))
 927                 elf_hwcap |= HWCAP_S390_TE;
 928 #endif
 929
 930         get_cpu_id(&cpu_id);
 931         switch (cpu_id.machine) {
 932         case 0x9672:
 933 #if !defined(CONFIG_64BIT)
 934         default:        /* Use "g5" as default for 31 bit kernels. */
 935 #endif
 936                 strcpy(elf_platform, "g5");
 937                 break;
 938         case 0x2064:
 939         case 0x2066:
 940 #if defined(CONFIG_64BIT)
 941         default:        /* Use "z900" as default for 64 bit kernels. */
 942 #endif
 943                 strcpy(elf_platform, "z900");
 944                 break;
 945         case 0x2084:
 946         case 0x2086:
 947                 strcpy(elf_platform, "z990");
 948                 break;
 949         case 0x2094:
 950         case 0x2096:
 951                 strcpy(elf_platform, "z9-109");
 952                 break;
 953         case 0x2097:
 954         case 0x2098:
 955                 strcpy(elf_platform, "z10");
 956                 break;
 957         case 0x2817:
 958         case 0x2818:
 959                 strcpy(elf_platform, "z196");
 960                 break;
 961         case 0x2827:
 962         case 0x2828:
 963                 strcpy(elf_platform, "zEC12");
 964                 break;
 965         }
 966 }
 967
 968 /*
 969  * Setup function called from init/main.c just after the banner
 970  * was printed.
 971  */
 972
 973 void __init setup_arch(char **cmdline_p)
 974 {
 975         /*
 976          * print what head.S has found out about the machine
 977          */
 978 #ifndef CONFIG_64BIT
 979         if (MACHINE_IS_VM)
 980                 pr_info("Linux is running as a z/VM "
 981                         "guest operating system in 31-bit mode\n");
 982         else if (MACHINE_IS_LPAR)
 983                 pr_info("Linux is running natively in 31-bit mode\n");
 984         if (MACHINE_HAS_IEEE)
 985                 pr_info("The hardware system has IEEE compatible "
 986                         "floating point units\n");
 987         else
 988                 pr_info("The hardware system has no IEEE compatible "
 989                         "floating point units\n");
 990 #else /* CONFIG_64BIT */
 991         if (MACHINE_IS_VM)
 992                 pr_info("Linux is running as a z/VM "
 993                         "guest operating system in 64-bit mode\n");
 994         else if (MACHINE_IS_KVM)
 995                 pr_info("Linux is running under KVM in 64-bit mode\n");
 996         else if (MACHINE_IS_LPAR)
 997                 pr_info("Linux is running natively in 64-bit mode\n");
 998 #endif /* CONFIG_64BIT */
 999
1000         /* Have one command line that is parsed and saved in /proc/cmdline */
1001         /* boot_command_line has been already set up in early.c */
1002         *cmdline_p = boot_command_line;
1003
1004         ROOT_DEV = Root_RAM0;
1005
1006         init_mm.start_code = PAGE_OFFSET;
1007         init_mm.end_code = (unsigned long) &_etext;
1008         init_mm.end_data = (unsigned long) &_edata;
1009         init_mm.brk = (unsigned long) &_end;
1010
1011         uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos : uaccess_pt;
1012
1013         parse_early_param();
1014         detect_memory_layout(memory_chunk, memory_end);
1015         os_info_init();
1016         setup_ipl();
1017         reserve_oldmem();
1018         setup_memory_end();
1019         reserve_crashkernel();
1020         setup_memory();
1021         setup_resources();
1022         setup_vmcoreinfo();
1023         setup_lowcore();
1024
1025         cpu_init();
1026         s390_init_cpu_topology();
1027
1028         /*
1029          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1030          */
1031         setup_hwcaps();
1032
1033         /*
1034          * Create kernel page tables and switch to virtual addressing.
1035          */
1036         paging_init();
1037
1038         /* Setup default console */
1039         conmode_default();
1040         set_preferred_console();
1041
1042         /* Setup zfcpdump support */
1043         setup_zfcpdump();
1044 }