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   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #define KMSG_COMPONENT "setup"
  18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  19
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/sched.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/stddef.h>
  26 #include <linux/unistd.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/slab.h>
  29 #include <linux/user.h>
  30 #include <linux/tty.h>
  31 #include <linux/ioport.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34 #include <linux/initrd.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/console.h>
  38 #include <linux/kernel_stat.h>
  39 #include <linux/device.h>
  40 #include <linux/notifier.h>
  41 #include <linux/pfn.h>
  42 #include <linux/ctype.h>
  43 #include <linux/reboot.h>
  44 #include <linux/topology.h>
  45 #include <linux/ftrace.h>
  46
  47 #include <asm/ipl.h>
  48 #include <asm/uaccess.h>
  49 #include <asm/system.h>
  50 #include <asm/smp.h>
  51 #include <asm/mmu_context.h>
  52 #include <asm/cpcmd.h>
  53 #include <asm/lowcore.h>
  54 #include <asm/irq.h>
  55 #include <asm/page.h>
  56 #include <asm/ptrace.h>
  57 #include <asm/sections.h>
  58 #include <asm/ebcdic.h>
  59 #include <asm/compat.h>
  60 #include <asm/kvm_virtio.h>
  61
  62 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  63                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  64 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  65                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  66                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  67
  68 /*
  69  * User copy operations.
  70  */
  71 struct uaccess_ops uaccess;
  72 EXPORT_SYMBOL(uaccess);
  73
  74 /*
  75  * Machine setup..
  76  */
  77 unsigned int console_mode = 0;
  78 EXPORT_SYMBOL(console_mode);
  79
  80 unsigned int console_devno = -1;
  81 EXPORT_SYMBOL(console_devno);
  82
  83 unsigned int console_irq = -1;
  84 EXPORT_SYMBOL(console_irq);
  85
  86 unsigned long elf_hwcap = 0;
  87 char elf_platform[ELF_PLATFORM_SIZE];
  88
  89 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  90 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  91
  92 int __initdata memory_end_set;
  93 unsigned long __initdata memory_end;
  94
  95 /* An array with a pointer to the lowcore of every CPU. */
  96 struct _lowcore *lowcore_ptr[NR_CPUS];
  97 EXPORT_SYMBOL(lowcore_ptr);
  98
  99 /*
 100  * This is set up by the setup-routine at boot-time
 101  * for S390 need to find out, what we have to setup
 102  * using address 0x10400 ...
 103  */
 104
 105 #include <asm/setup.h>
 106
 107 static struct resource code_resource = {
 108         .name  = "Kernel code",
 109         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 110 };
 111
 112 static struct resource data_resource = {
 113         .name = "Kernel data",
 114         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 115 };
 116
 117 /*
 118  * cpu_init() initializes state that is per-CPU.
 119  */
 120 void __cpuinit cpu_init(void)
 121 {
 122         /*
 123          * Store processor id in lowcore (used e.g. in timer_interrupt)
 124          */
 125         get_cpu_id(&S390_lowcore.cpu_id);
 126
 127         atomic_inc(&init_mm.mm_count);
 128         current->active_mm = &init_mm;
 129         BUG_ON(current->mm);
 130         enter_lazy_tlb(&init_mm, current);
 131 }
 132
 133 /*
 134  * condev= and conmode= setup parameter.
 135  */
 136
 137 static int __init condev_setup(char *str)
 138 {
 139         int vdev;
 140
 141         vdev = simple_strtoul(str, &str, 0);
 142         if (vdev >= 0 && vdev < 65536) {
 143                 console_devno = vdev;
 144                 console_irq = -1;
 145         }
 146         return 1;
 147 }
 148
 149 __setup("condev=", condev_setup);
 150
 151 static void __init set_preferred_console(void)
 152 {
 153         if (MACHINE_IS_KVM)
 154                 add_preferred_console("hvc", 0, NULL);
 155         else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 156                 add_preferred_console("ttyS", 0, NULL);
 157         else if (CONSOLE_IS_3270)
 158                 add_preferred_console("tty3270", 0, NULL);
 159 }
 160
 161 static int __init conmode_setup(char *str)
 162 {
 163 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 164         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 165                 SET_CONSOLE_SCLP;
 166 #endif
 167 #if defined(CONFIG_TN3215_CONSOLE)
 168         if (strncmp(str, "3215", 5) == 0)
 169                 SET_CONSOLE_3215;
 170 #endif
 171 #if defined(CONFIG_TN3270_CONSOLE)
 172         if (strncmp(str, "3270", 5) == 0)
 173                 SET_CONSOLE_3270;
 174 #endif
 175         set_preferred_console();
 176         return 1;
 177 }
 178
 179 __setup("conmode=", conmode_setup);
 180
 181 static void __init conmode_default(void)
 182 {
 183         char query_buffer[1024];
 184         char *ptr;
 185
 186         if (MACHINE_IS_VM) {
 187                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 188                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 189                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 190                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 191                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 192                 ptr = strstr(query_buffer, "CONMODE");
 193                 /*
 194                  * Set the conmode to 3215 so that the device recognition
 195                  * will set the cu_type of the console to 3215. If the
 196                  * conmode is 3270 and we don't set it back then both
 197                  * 3215 and the 3270 driver will try to access the console
 198                  * device (3215 as console and 3270 as normal tty).
 199                  */
 200                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 201                 if (ptr == NULL) {
 202 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 203                         SET_CONSOLE_SCLP;
 204 #endif
 205                         return;
 206                 }
 207                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 208 #if defined(CONFIG_TN3270_CONSOLE)
 209                         SET_CONSOLE_3270;
 210 #elif defined(CONFIG_TN3215_CONSOLE)
 211                         SET_CONSOLE_3215;
 212 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 213                         SET_CONSOLE_SCLP;
 214 #endif
 215                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 216 #if defined(CONFIG_TN3215_CONSOLE)
 217                         SET_CONSOLE_3215;
 218 #elif defined(CONFIG_TN3270_CONSOLE)
 219                         SET_CONSOLE_3270;
 220 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 221                         SET_CONSOLE_SCLP;
 222 #endif
 223                 }
 224         } else {
 225 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 226                 SET_CONSOLE_SCLP;
 227 #endif
 228         }
 229 }
 230
 231 #ifdef CONFIG_ZFCPDUMP
 232 static void __init setup_zfcpdump(unsigned int console_devno)
 233 {
 234         static char str[41];
 235
 236         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 237                 return;
 238         if (console_devno != -1)
 239                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 240                         ipl_info.data.fcp.dev_id.devno, console_devno);
 241         else
 242                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 243                         ipl_info.data.fcp.dev_id.devno);
 244         strcat(boot_command_line, str);
 245         console_loglevel = 2;
 246 }
 247 #else
 248 static inline void setup_zfcpdump(unsigned int console_devno) {}
 249 #endif /* CONFIG_ZFCPDUMP */
 250
 251  /*
 252  * Reboot, halt and power_off stubs. They just call _machine_restart,
 253  * _machine_halt or _machine_power_off.
 254  */
 255
 256 void machine_restart(char *command)
 257 {
 258         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 259                 /*
 260                  * Only unblank the console if we are called in enabled
 261                  * context or a bust_spinlocks cleared the way for us.
 262                  */
 263                 console_unblank();
 264         _machine_restart(command);
 265 }
 266
 267 void machine_halt(void)
 268 {
 269         if (!in_interrupt() || oops_in_progress)
 270                 /*
 271                  * Only unblank the console if we are called in enabled
 272                  * context or a bust_spinlocks cleared the way for us.
 273                  */
 274                 console_unblank();
 275         _machine_halt();
 276 }
 277
 278 void machine_power_off(void)
 279 {
 280         if (!in_interrupt() || oops_in_progress)
 281                 /*
 282                  * Only unblank the console if we are called in enabled
 283                  * context or a bust_spinlocks cleared the way for us.
 284                  */
 285                 console_unblank();
 286         _machine_power_off();
 287 }
 288
 289 /*
 290  * Dummy power off function.
 291  */
 292 void (*pm_power_off)(void) = machine_power_off;
 293
 294 static int __init early_parse_mem(char *p)
 295 {
 296         memory_end = memparse(p, &p);
 297         memory_end_set = 1;
 298         return 0;
 299 }
 300 early_param("mem", early_parse_mem);
 301
 302 unsigned int user_mode = HOME_SPACE_MODE;
 303 EXPORT_SYMBOL_GPL(user_mode);
 304
 305 static int set_amode_and_uaccess(unsigned long user_amode,
 306                                  unsigned long user32_amode)
 307 {
 308         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 309                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 310                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 311 #ifdef CONFIG_COMPAT
 312         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 313                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 314                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 315         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 316                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 317                           PSW32_MASK_PSTATE;
 318 #endif
 319         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 320                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 321
 322         if (MACHINE_HAS_MVCOS) {
 323                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 324                 return 1;
 325         } else {
 326                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 327                 return 0;
 328         }
 329 }
 330
 331 /*
 332  * Switch kernel/user addressing modes?
 333  */
 334 static int __init early_parse_switch_amode(char *p)
 335 {
 336         if (user_mode != SECONDARY_SPACE_MODE)
 337                 user_mode = PRIMARY_SPACE_MODE;
 338         return 0;
 339 }
 340 early_param("switch_amode", early_parse_switch_amode);
 341
 342 static int __init early_parse_user_mode(char *p)
 343 {
 344         if (p && strcmp(p, "primary") == 0)
 345                 user_mode = PRIMARY_SPACE_MODE;
 346 #ifdef CONFIG_S390_EXEC_PROTECT
 347         else if (p && strcmp(p, "secondary") == 0)
 348                 user_mode = SECONDARY_SPACE_MODE;
 349 #endif
 350         else if (!p || strcmp(p, "home") == 0)
 351                 user_mode = HOME_SPACE_MODE;
 352         else
 353                 return 1;
 354         return 0;
 355 }
 356 early_param("user_mode", early_parse_user_mode);
 357
 358 #ifdef CONFIG_S390_EXEC_PROTECT
 359 /*
 360  * Enable execute protection?
 361  */
 362 static int __init early_parse_noexec(char *p)
 363 {
 364         if (!strncmp(p, "off", 3))
 365                 return 0;
 366         user_mode = SECONDARY_SPACE_MODE;
 367         return 0;
 368 }
 369 early_param("noexec", early_parse_noexec);
 370 #endif /* CONFIG_S390_EXEC_PROTECT */
 371
 372 static void setup_addressing_mode(void)
 373 {
 374         if (user_mode == SECONDARY_SPACE_MODE) {
 375                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
 376                                           PSW32_ASC_SECONDARY))
 377                         pr_info("Execute protection active, "
 378                                 "mvcos available\n");
 379                 else
 380                         pr_info("Execute protection active, "
 381                                 "mvcos not available\n");
 382         } else if (user_mode == PRIMARY_SPACE_MODE) {
 383                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
 384                         pr_info("Address spaces switched, "
 385                                 "mvcos available\n");
 386                 else
 387                         pr_info("Address spaces switched, "
 388                                 "mvcos not available\n");
 389         }
 390 #ifdef CONFIG_TRACE_IRQFLAGS
 391         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 392         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 393 #endif
 394 }
 395
 396 static void __init
 397 setup_lowcore(void)
 398 {
 399         struct _lowcore *lc;
 400         int lc_pages;
 401
 402         /*
 403          * Setup lowcore for boot cpu
 404          */
 405         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 406         lc = (struct _lowcore *)
 407                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 408         memset(lc, 0, lc_pages * PAGE_SIZE);
 409         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 410         lc->restart_psw.addr =
 411                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 412         if (user_mode != HOME_SPACE_MODE)
 413                 lc->restart_psw.mask |= PSW_ASC_HOME;
 414         lc->external_new_psw.mask = psw_kernel_bits;
 415         lc->external_new_psw.addr =
 416                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 417         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 418         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 419         lc->program_new_psw.mask = psw_kernel_bits;
 420         lc->program_new_psw.addr =
 421                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 422         lc->mcck_new_psw.mask =
 423                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 424         lc->mcck_new_psw.addr =
 425                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 426         lc->io_new_psw.mask = psw_kernel_bits;
 427         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 428         lc->clock_comparator = -1ULL;
 429         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 430         lc->async_stack = (unsigned long)
 431                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 432         lc->panic_stack = (unsigned long)
 433                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 434         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 435         lc->thread_info = (unsigned long) &init_thread_union;
 436         lc->machine_flags = S390_lowcore.machine_flags;
 437 #ifndef CONFIG_64BIT
 438         if (MACHINE_HAS_IEEE) {
 439                 lc->extended_save_area_addr = (__u32)
 440                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 441                 /* enable extended save area */
 442                 __ctl_set_bit(14, 29);
 443         }
 444 #else
 445         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 446 #endif
 447         lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
 448         lc->async_enter_timer = S390_lowcore.async_enter_timer;
 449         lc->exit_timer = S390_lowcore.exit_timer;
 450         lc->user_timer = S390_lowcore.user_timer;
 451         lc->system_timer = S390_lowcore.system_timer;
 452         lc->steal_timer = S390_lowcore.steal_timer;
 453         lc->last_update_timer = S390_lowcore.last_update_timer;
 454         lc->last_update_clock = S390_lowcore.last_update_clock;
 455         lc->ftrace_func = S390_lowcore.ftrace_func;
 456         set_prefix((u32)(unsigned long) lc);
 457         lowcore_ptr[0] = lc;
 458 }
 459
 460 static void __init
 461 setup_resources(void)
 462 {
 463         struct resource *res, *sub_res;
 464         int i;
 465
 466         code_resource.start = (unsigned long) &_text;
 467         code_resource.end = (unsigned long) &_etext - 1;
 468         data_resource.start = (unsigned long) &_etext;
 469         data_resource.end = (unsigned long) &_edata - 1;
 470
 471         for (i = 0; i < MEMORY_CHUNKS; i++) {
 472                 if (!memory_chunk[i].size)
 473                         continue;
 474                 res = alloc_bootmem_low(sizeof(struct resource));
 475                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 476                 switch (memory_chunk[i].type) {
 477                 case CHUNK_READ_WRITE:
 478                         res->name = "System RAM";
 479                         break;
 480                 case CHUNK_READ_ONLY:
 481                         res->name = "System ROM";
 482                         res->flags |= IORESOURCE_READONLY;
 483                         break;
 484                 default:
 485                         res->name = "reserved";
 486                 }
 487                 res->start = memory_chunk[i].addr;
 488                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 489                 request_resource(&iomem_resource, res);
 490
 491                 if (code_resource.start >= res->start  &&
 492                         code_resource.start <= res->end &&
 493                         code_resource.end > res->end) {
 494                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 495                         memcpy(sub_res, &code_resource,
 496                                 sizeof(struct resource));
 497                         sub_res->end = res->end;
 498                         code_resource.start = res->end + 1;
 499                         request_resource(res, sub_res);
 500                 }
 501
 502                 if (code_resource.start >= res->start &&
 503                         code_resource.start <= res->end &&
 504                         code_resource.end <= res->end)
 505                         request_resource(res, &code_resource);
 506
 507                 if (data_resource.start >= res->start &&
 508                         data_resource.start <= res->end &&
 509                         data_resource.end > res->end) {
 510                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 511                         memcpy(sub_res, &data_resource,
 512                                 sizeof(struct resource));
 513                         sub_res->end = res->end;
 514                         data_resource.start = res->end + 1;
 515                         request_resource(res, sub_res);
 516                 }
 517
 518                 if (data_resource.start >= res->start &&
 519                         data_resource.start <= res->end &&
 520                         data_resource.end <= res->end)
 521                         request_resource(res, &data_resource);
 522         }
 523 }
 524
 525 unsigned long real_memory_size;
 526 EXPORT_SYMBOL_GPL(real_memory_size);
 527
 528 static void __init setup_memory_end(void)
 529 {
 530         unsigned long memory_size;
 531         unsigned long max_mem;
 532         int i;
 533
 534 #ifdef CONFIG_ZFCPDUMP
 535         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 536                 memory_end = ZFCPDUMP_HSA_SIZE;
 537                 memory_end_set = 1;
 538         }
 539 #endif
 540         memory_size = 0;
 541         memory_end &= PAGE_MASK;
 542
 543         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 544         memory_end = min(max_mem, memory_end);
 545
 546         /*
 547          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 548          * extra checks that HOLES_IN_ZONE would require.
 549          */
 550         for (i = 0; i < MEMORY_CHUNKS; i++) {
 551                 unsigned long start, end;
 552                 struct mem_chunk *chunk;
 553                 unsigned long align;
 554
 555                 chunk = &memory_chunk[i];
 556                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 557                 start = (chunk->addr + align - 1) & ~(align - 1);
 558                 end = (chunk->addr + chunk->size) & ~(align - 1);
 559                 if (start >= end)
 560                         memset(chunk, 0, sizeof(*chunk));
 561                 else {
 562                         chunk->addr = start;
 563                         chunk->size = end - start;
 564                 }
 565         }
 566
 567         for (i = 0; i < MEMORY_CHUNKS; i++) {
 568                 struct mem_chunk *chunk = &memory_chunk[i];
 569
 570                 real_memory_size = max(real_memory_size,
 571                                        chunk->addr + chunk->size);
 572                 if (chunk->addr >= max_mem) {
 573                         memset(chunk, 0, sizeof(*chunk));
 574                         continue;
 575                 }
 576                 if (chunk->addr + chunk->size > max_mem)
 577                         chunk->size = max_mem - chunk->addr;
 578                 memory_size = max(memory_size, chunk->addr + chunk->size);
 579         }
 580         if (!memory_end)
 581                 memory_end = memory_size;
 582 }
 583
 584 static void __init
 585 setup_memory(void)
 586 {
 587         unsigned long bootmap_size;
 588         unsigned long start_pfn, end_pfn;
 589         int i;
 590
 591         /*
 592          * partially used pages are not usable - thus
 593          * we are rounding upwards:
 594          */
 595         start_pfn = PFN_UP(__pa(&_end));
 596         end_pfn = max_pfn = PFN_DOWN(memory_end);
 597
 598 #ifdef CONFIG_BLK_DEV_INITRD
 599         /*
 600          * Move the initrd in case the bitmap of the bootmem allocater
 601          * would overwrite it.
 602          */
 603
 604         if (INITRD_START && INITRD_SIZE) {
 605                 unsigned long bmap_size;
 606                 unsigned long start;
 607
 608                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 609                 bmap_size = PFN_PHYS(bmap_size);
 610
 611                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 612                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 613
 614                         if (start + INITRD_SIZE > memory_end) {
 615                                 pr_err("initrd extends beyond end of "
 616                                        "memory (0x%08lx > 0x%08lx) "
 617                                        "disabling initrd\n",
 618                                        start + INITRD_SIZE, memory_end);
 619                                 INITRD_START = INITRD_SIZE = 0;
 620                         } else {
 621                                 pr_info("Moving initrd (0x%08lx -> "
 622                                         "0x%08lx, size: %ld)\n",
 623                                         INITRD_START, start, INITRD_SIZE);
 624                                 memmove((void *) start, (void *) INITRD_START,
 625                                         INITRD_SIZE);
 626                                 INITRD_START = start;
 627                         }
 628                 }
 629         }
 630 #endif
 631
 632         /*
 633          * Initialize the boot-time allocator
 634          */
 635         bootmap_size = init_bootmem(start_pfn, end_pfn);
 636
 637         /*
 638          * Register RAM areas with the bootmem allocator.
 639          */
 640
 641         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 642                 unsigned long start_chunk, end_chunk, pfn;
 643
 644                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 645                         continue;
 646                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 647                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 648                 end_chunk = min(end_chunk, end_pfn);
 649                 if (start_chunk >= end_chunk)
 650                         continue;
 651                 add_active_range(0, start_chunk, end_chunk);
 652                 pfn = max(start_chunk, start_pfn);
 653                 for (; pfn < end_chunk; pfn++)
 654                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 655         }
 656
 657         psw_set_key(PAGE_DEFAULT_KEY);
 658
 659         free_bootmem_with_active_regions(0, max_pfn);
 660
 661         /*
 662          * Reserve memory used for lowcore/command line/kernel image.
 663          */
 664         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 665         reserve_bootmem((unsigned long)_stext,
 666                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 667                         BOOTMEM_DEFAULT);
 668         /*
 669          * Reserve the bootmem bitmap itself as well. We do this in two
 670          * steps (first step was init_bootmem()) because this catches
 671          * the (very unlikely) case of us accidentally initializing the
 672          * bootmem allocator with an invalid RAM area.
 673          */
 674         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 675                         BOOTMEM_DEFAULT);
 676
 677 #ifdef CONFIG_BLK_DEV_INITRD
 678         if (INITRD_START && INITRD_SIZE) {
 679                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 680                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 681                                         BOOTMEM_DEFAULT);
 682                         initrd_start = INITRD_START;
 683                         initrd_end = initrd_start + INITRD_SIZE;
 684                 } else {
 685                         pr_err("initrd extends beyond end of "
 686                                "memory (0x%08lx > 0x%08lx) "
 687                                "disabling initrd\n",
 688                                initrd_start + INITRD_SIZE, memory_end);
 689                         initrd_start = initrd_end = 0;
 690                 }
 691         }
 692 #endif
 693 }
 694
 695 /*
 696  * Setup hardware capabilities.
 697  */
 698 static void __init setup_hwcaps(void)
 699 {
 700         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 701         unsigned long long facility_list_extended;
 702         unsigned int facility_list;
 703         int i;
 704
 705         facility_list = stfl();
 706         /*
 707          * The store facility list bits numbers as found in the principles
 708          * of operation are numbered with bit 1UL<<31 as number 0 to
 709          * bit 1UL<<0 as number 31.
 710          *   Bit 0: instructions named N3, "backported" to esa-mode
 711          *   Bit 2: z/Architecture mode is active
 712          *   Bit 7: the store-facility-list-extended facility is installed
 713          *   Bit 17: the message-security assist is installed
 714          *   Bit 19: the long-displacement facility is installed
 715          *   Bit 21: the extended-immediate facility is installed
 716          *   Bit 22: extended-translation facility 3 is installed
 717          *   Bit 30: extended-translation facility 3 enhancement facility
 718          * These get translated to:
 719          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 720          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 721          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
 722          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
 723          */
 724         for (i = 0; i < 6; i++)
 725                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 726                         elf_hwcap |= 1UL << i;
 727
 728         if ((facility_list & (1UL << (31 - 22)))
 729             && (facility_list & (1UL << (31 - 30))))
 730                 elf_hwcap |= HWCAP_S390_ETF3EH;
 731
 732         /*
 733          * Check for additional facilities with store-facility-list-extended.
 734          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 735          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 736          * as stored by stfl, bits 32-xxx contain additional facilities.
 737          * How many facility words are stored depends on the number of
 738          * doublewords passed to the instruction. The additional facilites
 739          * are:
 740          *   Bit 42: decimal floating point facility is installed
 741          *   Bit 44: perform floating point operation facility is installed
 742          * translated to:
 743          *   HWCAP_S390_DFP bit 6 (42 && 44).
 744          */
 745         if ((elf_hwcap & (1UL << 2)) &&
 746             __stfle(&facility_list_extended, 1) > 0) {
 747                 if ((facility_list_extended & (1ULL << (63 - 42)))
 748                     && (facility_list_extended & (1ULL << (63 - 44))))
 749                         elf_hwcap |= HWCAP_S390_DFP;
 750         }
 751
 752         /*
 753          * Huge page support HWCAP_S390_HPAGE is bit 7.
 754          */
 755         if (MACHINE_HAS_HPAGE)
 756                 elf_hwcap |= HWCAP_S390_HPAGE;
 757
 758         /*
 759          * 64-bit register support for 31-bit processes
 760          * HWCAP_S390_HIGH_GPRS is bit 9.
 761          */
 762         elf_hwcap |= HWCAP_S390_HIGH_GPRS;
 763
 764         switch (S390_lowcore.cpu_id.machine) {
 765         case 0x9672:
 766 #if !defined(CONFIG_64BIT)
 767         default:        /* Use "g5" as default for 31 bit kernels. */
 768 #endif
 769                 strcpy(elf_platform, "g5");
 770                 break;
 771         case 0x2064:
 772         case 0x2066:
 773 #if defined(CONFIG_64BIT)
 774         default:        /* Use "z900" as default for 64 bit kernels. */
 775 #endif
 776                 strcpy(elf_platform, "z900");
 777                 break;
 778         case 0x2084:
 779         case 0x2086:
 780                 strcpy(elf_platform, "z990");
 781                 break;
 782         case 0x2094:
 783         case 0x2096:
 784                 strcpy(elf_platform, "z9-109");
 785                 break;
 786         case 0x2097:
 787         case 0x2098:
 788                 strcpy(elf_platform, "z10");
 789                 break;
 790         }
 791 }
 792
 793 /*
 794  * Setup function called from init/main.c just after the banner
 795  * was printed.
 796  */
 797
 798 void __init
 799 setup_arch(char **cmdline_p)
 800 {
 801         /*
 802          * print what head.S has found out about the machine
 803          */
 804 #ifndef CONFIG_64BIT
 805         if (MACHINE_IS_VM)
 806                 pr_info("Linux is running as a z/VM "
 807                         "guest operating system in 31-bit mode\n");
 808         else
 809                 pr_info("Linux is running natively in 31-bit mode\n");
 810         if (MACHINE_HAS_IEEE)
 811                 pr_info("The hardware system has IEEE compatible "
 812                         "floating point units\n");
 813         else
 814                 pr_info("The hardware system has no IEEE compatible "
 815                         "floating point units\n");
 816 #else /* CONFIG_64BIT */
 817         if (MACHINE_IS_VM)
 818                 pr_info("Linux is running as a z/VM "
 819                         "guest operating system in 64-bit mode\n");
 820         else if (MACHINE_IS_KVM)
 821                 pr_info("Linux is running under KVM in 64-bit mode\n");
 822         else
 823                 pr_info("Linux is running natively in 64-bit mode\n");
 824 #endif /* CONFIG_64BIT */
 825
 826         /* Have one command line that is parsed and saved in /proc/cmdline */
 827         /* boot_command_line has been already set up in early.c */
 828         *cmdline_p = boot_command_line;
 829
 830         ROOT_DEV = Root_RAM0;
 831
 832         init_mm.start_code = PAGE_OFFSET;
 833         init_mm.end_code = (unsigned long) &_etext;
 834         init_mm.end_data = (unsigned long) &_edata;
 835         init_mm.brk = (unsigned long) &_end;
 836
 837         if (MACHINE_HAS_MVCOS)
 838                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 839         else
 840                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 841
 842         parse_early_param();
 843
 844         setup_ipl();
 845         setup_memory_end();
 846         setup_addressing_mode();
 847         setup_memory();
 848         setup_resources();
 849         setup_lowcore();
 850
 851         cpu_init();
 852         __cpu_logical_map[0] = stap();
 853         s390_init_cpu_topology();
 854
 855         /*
 856          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 857          */
 858         setup_hwcaps();
 859
 860         /*
 861          * Create kernel page tables and switch to virtual addressing.
 862          */
 863         paging_init();
 864
 865         /* Setup default console */
 866         conmode_default();
 867         set_preferred_console();
 868
 869         /* Setup zfcpdump support */
 870         setup_zfcpdump(console_devno);
 871 }