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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 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/tty.h>
  28 #include <linux/ioport.h>
  29 #include <linux/delay.h>
  30 #include <linux/init.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/root_dev.h>
  34 #include <linux/console.h>
  35 #include <linux/seq_file.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
  44 #include <asm/ipl.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/system.h>
  47 #include <asm/smp.h>
  48 #include <asm/mmu_context.h>
  49 #include <asm/cpcmd.h>
  50 #include <asm/lowcore.h>
  51 #include <asm/irq.h>
  52 #include <asm/page.h>
  53 #include <asm/ptrace.h>
  54 #include <asm/sections.h>
  55 #include <asm/ebcdic.h>
  56 #include <asm/compat.h>
  57
  58 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  59                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  60 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  61                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  62                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  63
  64 /*
  65  * User copy operations.
  66  */
  67 struct uaccess_ops uaccess;
  68 EXPORT_SYMBOL(uaccess);
  69
  70 /*
  71  * Machine setup..
  72  */
  73 unsigned int console_mode = 0;
  74 unsigned int console_devno = -1;
  75 unsigned int console_irq = -1;
  76 unsigned long machine_flags;
  77 unsigned long elf_hwcap = 0;
  78 char elf_platform[ELF_PLATFORM_SIZE];
  79
  80 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  81 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  82 static unsigned long __initdata memory_end;
  83
  84 /*
  85  * This is set up by the setup-routine at boot-time
  86  * for S390 need to find out, what we have to setup
  87  * using address 0x10400 ...
  88  */
  89
  90 #include <asm/setup.h>
  91
  92 static struct resource code_resource = {
  93         .name  = "Kernel code",
  94         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  95 };
  96
  97 static struct resource data_resource = {
  98         .name = "Kernel data",
  99         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 100 };
 101
 102 /*
 103  * cpu_init() initializes state that is per-CPU.
 104  */
 105 void __cpuinit cpu_init(void)
 106 {
 107         int addr = hard_smp_processor_id();
 108
 109         /*
 110          * Store processor id in lowcore (used e.g. in timer_interrupt)
 111          */
 112         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 113         S390_lowcore.cpu_data.cpu_addr = addr;
 114
 115         /*
 116          * Force FPU initialization:
 117          */
 118         clear_thread_flag(TIF_USEDFPU);
 119         clear_used_math();
 120
 121         atomic_inc(&init_mm.mm_count);
 122         current->active_mm = &init_mm;
 123         if (current->mm)
 124                 BUG();
 125         enter_lazy_tlb(&init_mm, current);
 126 }
 127
 128 /*
 129  * condev= and conmode= setup parameter.
 130  */
 131
 132 static int __init condev_setup(char *str)
 133 {
 134         int vdev;
 135
 136         vdev = simple_strtoul(str, &str, 0);
 137         if (vdev >= 0 && vdev < 65536) {
 138                 console_devno = vdev;
 139                 console_irq = -1;
 140         }
 141         return 1;
 142 }
 143
 144 __setup("condev=", condev_setup);
 145
 146 static int __init conmode_setup(char *str)
 147 {
 148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 149         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 150                 SET_CONSOLE_SCLP;
 151 #endif
 152 #if defined(CONFIG_TN3215_CONSOLE)
 153         if (strncmp(str, "3215", 5) == 0)
 154                 SET_CONSOLE_3215;
 155 #endif
 156 #if defined(CONFIG_TN3270_CONSOLE)
 157         if (strncmp(str, "3270", 5) == 0)
 158                 SET_CONSOLE_3270;
 159 #endif
 160         return 1;
 161 }
 162
 163 __setup("conmode=", conmode_setup);
 164
 165 static void __init conmode_default(void)
 166 {
 167         char query_buffer[1024];
 168         char *ptr;
 169
 170         if (MACHINE_IS_VM) {
 171                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 172                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 173                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 174                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 175                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 176                 ptr = strstr(query_buffer, "CONMODE");
 177                 /*
 178                  * Set the conmode to 3215 so that the device recognition
 179                  * will set the cu_type of the console to 3215. If the
 180                  * conmode is 3270 and we don't set it back then both
 181                  * 3215 and the 3270 driver will try to access the console
 182                  * device (3215 as console and 3270 as normal tty).
 183                  */
 184                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 185                 if (ptr == NULL) {
 186 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 187                         SET_CONSOLE_SCLP;
 188 #endif
 189                         return;
 190                 }
 191                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 192 #if defined(CONFIG_TN3270_CONSOLE)
 193                         SET_CONSOLE_3270;
 194 #elif defined(CONFIG_TN3215_CONSOLE)
 195                         SET_CONSOLE_3215;
 196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 197                         SET_CONSOLE_SCLP;
 198 #endif
 199                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 200 #if defined(CONFIG_TN3215_CONSOLE)
 201                         SET_CONSOLE_3215;
 202 #elif defined(CONFIG_TN3270_CONSOLE)
 203                         SET_CONSOLE_3270;
 204 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 205                         SET_CONSOLE_SCLP;
 206 #endif
 207                 }
 208         } else if (MACHINE_IS_P390) {
 209 #if defined(CONFIG_TN3215_CONSOLE)
 210                 SET_CONSOLE_3215;
 211 #elif defined(CONFIG_TN3270_CONSOLE)
 212                 SET_CONSOLE_3270;
 213 #endif
 214         } else {
 215 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 216                 SET_CONSOLE_SCLP;
 217 #endif
 218         }
 219 }
 220
 221 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 222 static void __init setup_zfcpdump(unsigned int console_devno)
 223 {
 224         static char str[41];
 225
 226         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 227                 return;
 228         if (console_devno != -1)
 229                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 230                         ipl_info.data.fcp.dev_id.devno, console_devno);
 231         else
 232                 sprintf(str, " cio_ignore=all,!0.0.%04x",
 233                         ipl_info.data.fcp.dev_id.devno);
 234         strcat(boot_command_line, str);
 235         console_loglevel = 2;
 236 }
 237 #else
 238 static inline void setup_zfcpdump(unsigned int console_devno) {}
 239 #endif /* CONFIG_ZFCPDUMP */
 240
 241  /*
 242  * Reboot, halt and power_off stubs. They just call _machine_restart,
 243  * _machine_halt or _machine_power_off.
 244  */
 245
 246 void machine_restart(char *command)
 247 {
 248         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 249                 /*
 250                  * Only unblank the console if we are called in enabled
 251                  * context or a bust_spinlocks cleared the way for us.
 252                  */
 253                 console_unblank();
 254         _machine_restart(command);
 255 }
 256
 257 void machine_halt(void)
 258 {
 259         if (!in_interrupt() || oops_in_progress)
 260                 /*
 261                  * Only unblank the console if we are called in enabled
 262                  * context or a bust_spinlocks cleared the way for us.
 263                  */
 264                 console_unblank();
 265         _machine_halt();
 266 }
 267
 268 void machine_power_off(void)
 269 {
 270         if (!in_interrupt() || 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_power_off();
 277 }
 278
 279 /*
 280  * Dummy power off function.
 281  */
 282 void (*pm_power_off)(void) = machine_power_off;
 283
 284 static int __init early_parse_mem(char *p)
 285 {
 286         memory_end = memparse(p, &p);
 287         return 0;
 288 }
 289 early_param("mem", early_parse_mem);
 290
 291 #ifdef CONFIG_S390_SWITCH_AMODE
 292 #ifdef CONFIG_PGSTE
 293 unsigned int switch_amode = 1;
 294 #else
 295 unsigned int switch_amode = 0;
 296 #endif
 297 EXPORT_SYMBOL_GPL(switch_amode);
 298
 299 static void set_amode_and_uaccess(unsigned long user_amode,
 300                                   unsigned long user32_amode)
 301 {
 302         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 303                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 304                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 305 #ifdef CONFIG_COMPAT
 306         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 307                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 308                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 309         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 310                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 311                           PSW32_MASK_PSTATE;
 312 #endif
 313         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 314                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 315
 316         if (MACHINE_HAS_MVCOS) {
 317                 printk("mvcos available.\n");
 318                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 319         } else {
 320                 printk("mvcos not available.\n");
 321                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 322         }
 323 }
 324
 325 /*
 326  * Switch kernel/user addressing modes?
 327  */
 328 static int __init early_parse_switch_amode(char *p)
 329 {
 330         switch_amode = 1;
 331         return 0;
 332 }
 333 early_param("switch_amode", early_parse_switch_amode);
 334
 335 #else /* CONFIG_S390_SWITCH_AMODE */
 336 static inline void set_amode_and_uaccess(unsigned long user_amode,
 337                                          unsigned long user32_amode)
 338 {
 339 }
 340 #endif /* CONFIG_S390_SWITCH_AMODE */
 341
 342 #ifdef CONFIG_S390_EXEC_PROTECT
 343 unsigned int s390_noexec = 0;
 344 EXPORT_SYMBOL_GPL(s390_noexec);
 345
 346 /*
 347  * Enable execute protection?
 348  */
 349 static int __init early_parse_noexec(char *p)
 350 {
 351         if (!strncmp(p, "off", 3))
 352                 return 0;
 353         switch_amode = 1;
 354         s390_noexec = 1;
 355         return 0;
 356 }
 357 early_param("noexec", early_parse_noexec);
 358 #endif /* CONFIG_S390_EXEC_PROTECT */
 359
 360 static void setup_addressing_mode(void)
 361 {
 362         if (s390_noexec) {
 363                 printk("S390 execute protection active, ");
 364                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 365         } else if (switch_amode) {
 366                 printk("S390 address spaces switched, ");
 367                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 368         }
 369 #ifdef CONFIG_TRACE_IRQFLAGS
 370         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 371         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 372 #endif
 373 }
 374
 375 static void __init
 376 setup_lowcore(void)
 377 {
 378         struct _lowcore *lc;
 379         int lc_pages;
 380
 381         /*
 382          * Setup lowcore for boot cpu
 383          */
 384         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 385         lc = (struct _lowcore *)
 386                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 387         memset(lc, 0, lc_pages * PAGE_SIZE);
 388         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 389         lc->restart_psw.addr =
 390                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 391         if (switch_amode)
 392                 lc->restart_psw.mask |= PSW_ASC_HOME;
 393         lc->external_new_psw.mask = psw_kernel_bits;
 394         lc->external_new_psw.addr =
 395                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 396         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 397         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 398         lc->program_new_psw.mask = psw_kernel_bits;
 399         lc->program_new_psw.addr =
 400                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 401         lc->mcck_new_psw.mask =
 402                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 403         lc->mcck_new_psw.addr =
 404                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 405         lc->io_new_psw.mask = psw_kernel_bits;
 406         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 407         lc->ipl_device = S390_lowcore.ipl_device;
 408         lc->clock_comparator = -1ULL;
 409         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 410         lc->async_stack = (unsigned long)
 411                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 412         lc->panic_stack = (unsigned long)
 413                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 414         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 415         lc->thread_info = (unsigned long) &init_thread_union;
 416 #ifndef CONFIG_64BIT
 417         if (MACHINE_HAS_IEEE) {
 418                 lc->extended_save_area_addr = (__u32)
 419                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 420                 /* enable extended save area */
 421                 __ctl_set_bit(14, 29);
 422         }
 423 #endif
 424         set_prefix((u32)(unsigned long) lc);
 425 }
 426
 427 static void __init
 428 setup_resources(void)
 429 {
 430         struct resource *res, *sub_res;
 431         int i;
 432
 433         code_resource.start = (unsigned long) &_text;
 434         code_resource.end = (unsigned long) &_etext - 1;
 435         data_resource.start = (unsigned long) &_etext;
 436         data_resource.end = (unsigned long) &_edata - 1;
 437
 438         for (i = 0; i < MEMORY_CHUNKS; i++) {
 439                 if (!memory_chunk[i].size)
 440                         continue;
 441                 res = alloc_bootmem_low(sizeof(struct resource));
 442                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 443                 switch (memory_chunk[i].type) {
 444                 case CHUNK_READ_WRITE:
 445                         res->name = "System RAM";
 446                         break;
 447                 case CHUNK_READ_ONLY:
 448                         res->name = "System ROM";
 449                         res->flags |= IORESOURCE_READONLY;
 450                         break;
 451                 default:
 452                         res->name = "reserved";
 453                 }
 454                 res->start = memory_chunk[i].addr;
 455                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 456                 request_resource(&iomem_resource, res);
 457
 458                 if (code_resource.start >= res->start  &&
 459                         code_resource.start <= res->end &&
 460                         code_resource.end > res->end) {
 461                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 462                         memcpy(sub_res, &code_resource,
 463                                 sizeof(struct resource));
 464                         sub_res->end = res->end;
 465                         code_resource.start = res->end + 1;
 466                         request_resource(res, sub_res);
 467                 }
 468
 469                 if (code_resource.start >= res->start &&
 470                         code_resource.start <= res->end &&
 471                         code_resource.end <= res->end)
 472                         request_resource(res, &code_resource);
 473
 474                 if (data_resource.start >= res->start &&
 475                         data_resource.start <= res->end &&
 476                         data_resource.end > res->end) {
 477                         sub_res = alloc_bootmem_low(sizeof(struct resource));
 478                         memcpy(sub_res, &data_resource,
 479                                 sizeof(struct resource));
 480                         sub_res->end = res->end;
 481                         data_resource.start = res->end + 1;
 482                         request_resource(res, sub_res);
 483                 }
 484
 485                 if (data_resource.start >= res->start &&
 486                         data_resource.start <= res->end &&
 487                         data_resource.end <= res->end)
 488                         request_resource(res, &data_resource);
 489         }
 490 }
 491
 492 unsigned long real_memory_size;
 493 EXPORT_SYMBOL_GPL(real_memory_size);
 494
 495 static void __init setup_memory_end(void)
 496 {
 497         unsigned long memory_size;
 498         unsigned long max_mem;
 499         int i;
 500
 501 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 502         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 503                 memory_end = ZFCPDUMP_HSA_SIZE;
 504 #endif
 505         memory_size = 0;
 506         memory_end &= PAGE_MASK;
 507
 508         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 509         memory_end = min(max_mem, memory_end);
 510
 511         /*
 512          * Make sure all chunks are MAX_ORDER aligned so we don't need the
 513          * extra checks that HOLES_IN_ZONE would require.
 514          */
 515         for (i = 0; i < MEMORY_CHUNKS; i++) {
 516                 unsigned long start, end;
 517                 struct mem_chunk *chunk;
 518                 unsigned long align;
 519
 520                 chunk = &memory_chunk[i];
 521                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 522                 start = (chunk->addr + align - 1) & ~(align - 1);
 523                 end = (chunk->addr + chunk->size) & ~(align - 1);
 524                 if (start >= end)
 525                         memset(chunk, 0, sizeof(*chunk));
 526                 else {
 527                         chunk->addr = start;
 528                         chunk->size = end - start;
 529                 }
 530         }
 531
 532         for (i = 0; i < MEMORY_CHUNKS; i++) {
 533                 struct mem_chunk *chunk = &memory_chunk[i];
 534
 535                 real_memory_size = max(real_memory_size,
 536                                        chunk->addr + chunk->size);
 537                 if (chunk->addr >= max_mem) {
 538                         memset(chunk, 0, sizeof(*chunk));
 539                         continue;
 540                 }
 541                 if (chunk->addr + chunk->size > max_mem)
 542                         chunk->size = max_mem - chunk->addr;
 543                 memory_size = max(memory_size, chunk->addr + chunk->size);
 544         }
 545         if (!memory_end)
 546                 memory_end = memory_size;
 547 }
 548
 549 static void __init
 550 setup_memory(void)
 551 {
 552         unsigned long bootmap_size;
 553         unsigned long start_pfn, end_pfn;
 554         int i;
 555
 556         /*
 557          * partially used pages are not usable - thus
 558          * we are rounding upwards:
 559          */
 560         start_pfn = PFN_UP(__pa(&_end));
 561         end_pfn = max_pfn = PFN_DOWN(memory_end);
 562
 563 #ifdef CONFIG_BLK_DEV_INITRD
 564         /*
 565          * Move the initrd in case the bitmap of the bootmem allocater
 566          * would overwrite it.
 567          */
 568
 569         if (INITRD_START && INITRD_SIZE) {
 570                 unsigned long bmap_size;
 571                 unsigned long start;
 572
 573                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 574                 bmap_size = PFN_PHYS(bmap_size);
 575
 576                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 577                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 578
 579                         if (start + INITRD_SIZE > memory_end) {
 580                                 printk("initrd extends beyond end of memory "
 581                                        "(0x%08lx > 0x%08lx)\n"
 582                                        "disabling initrd\n",
 583                                        start + INITRD_SIZE, memory_end);
 584                                 INITRD_START = INITRD_SIZE = 0;
 585                         } else {
 586                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 587                                        "size: %ld)\n",
 588                                        INITRD_START, start, INITRD_SIZE);
 589                                 memmove((void *) start, (void *) INITRD_START,
 590                                         INITRD_SIZE);
 591                                 INITRD_START = start;
 592                         }
 593                 }
 594         }
 595 #endif
 596
 597         /*
 598          * Initialize the boot-time allocator
 599          */
 600         bootmap_size = init_bootmem(start_pfn, end_pfn);
 601
 602         /*
 603          * Register RAM areas with the bootmem allocator.
 604          */
 605
 606         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 607                 unsigned long start_chunk, end_chunk, pfn;
 608
 609                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 610                         continue;
 611                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
 612                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
 613                 end_chunk = min(end_chunk, end_pfn);
 614                 if (start_chunk >= end_chunk)
 615                         continue;
 616                 add_active_range(0, start_chunk, end_chunk);
 617                 pfn = max(start_chunk, start_pfn);
 618                 for (; pfn <= end_chunk; pfn++)
 619                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 620         }
 621
 622         psw_set_key(PAGE_DEFAULT_KEY);
 623
 624         free_bootmem_with_active_regions(0, max_pfn);
 625
 626         /*
 627          * Reserve memory used for lowcore/command line/kernel image.
 628          */
 629         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 630         reserve_bootmem((unsigned long)_stext,
 631                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
 632                         BOOTMEM_DEFAULT);
 633         /*
 634          * Reserve the bootmem bitmap itself as well. We do this in two
 635          * steps (first step was init_bootmem()) because this catches
 636          * the (very unlikely) case of us accidentally initializing the
 637          * bootmem allocator with an invalid RAM area.
 638          */
 639         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 640                         BOOTMEM_DEFAULT);
 641
 642 #ifdef CONFIG_BLK_DEV_INITRD
 643         if (INITRD_START && INITRD_SIZE) {
 644                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 645                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 646                                         BOOTMEM_DEFAULT);
 647                         initrd_start = INITRD_START;
 648                         initrd_end = initrd_start + INITRD_SIZE;
 649                 } else {
 650                         printk("initrd extends beyond end of memory "
 651                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 652                                initrd_start + INITRD_SIZE, memory_end);
 653                         initrd_start = initrd_end = 0;
 654                 }
 655         }
 656 #endif
 657 }
 658
 659 static int __init __stfle(unsigned long long *list, int doublewords)
 660 {
 661         typedef struct { unsigned long long _[doublewords]; } addrtype;
 662         register unsigned long __nr asm("0") = doublewords - 1;
 663
 664         asm volatile(".insn s,0xb2b00000,%0" /* stfle */
 665                      : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
 666         return __nr + 1;
 667 }
 668
 669 int __init stfle(unsigned long long *list, int doublewords)
 670 {
 671         if (!(stfl() & (1UL << 24)))
 672                 return -EOPNOTSUPP;
 673         return __stfle(list, doublewords);
 674 }
 675
 676 /*
 677  * Setup hardware capabilities.
 678  */
 679 static void __init setup_hwcaps(void)
 680 {
 681         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 682         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 683         unsigned long long facility_list_extended;
 684         unsigned int facility_list;
 685         int i;
 686
 687         facility_list = stfl();
 688         /*
 689          * The store facility list bits numbers as found in the principles
 690          * of operation are numbered with bit 1UL<<31 as number 0 to
 691          * bit 1UL<<0 as number 31.
 692          *   Bit 0: instructions named N3, "backported" to esa-mode
 693          *   Bit 2: z/Architecture mode is active
 694          *   Bit 7: the store-facility-list-extended facility is installed
 695          *   Bit 17: the message-security assist is installed
 696          *   Bit 19: the long-displacement facility is installed
 697          *   Bit 21: the extended-immediate facility is installed
 698          * These get translated to:
 699          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 700          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 701          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 702          */
 703         for (i = 0; i < 6; i++)
 704                 if (facility_list & (1UL << (31 - stfl_bits[i])))
 705                         elf_hwcap |= 1UL << i;
 706
 707         /*
 708          * Check for additional facilities with store-facility-list-extended.
 709          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 710          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 711          * as stored by stfl, bits 32-xxx contain additional facilities.
 712          * How many facility words are stored depends on the number of
 713          * doublewords passed to the instruction. The additional facilites
 714          * are:
 715          *   Bit 43: decimal floating point facility is installed
 716          * translated to:
 717          *   HWCAP_S390_DFP bit 6.
 718          */
 719         if ((elf_hwcap & (1UL << 2)) &&
 720             __stfle(&facility_list_extended, 1) > 0) {
 721                 if (facility_list_extended & (1ULL << (64 - 43)))
 722                         elf_hwcap |= 1UL << 6;
 723         }
 724
 725         if (MACHINE_HAS_HPAGE)
 726                 elf_hwcap |= 1UL << 7;
 727
 728         switch (cpuinfo->cpu_id.machine) {
 729         case 0x9672:
 730 #if !defined(CONFIG_64BIT)
 731         default:        /* Use "g5" as default for 31 bit kernels. */
 732 #endif
 733                 strcpy(elf_platform, "g5");
 734                 break;
 735         case 0x2064:
 736         case 0x2066:
 737 #if defined(CONFIG_64BIT)
 738         default:        /* Use "z900" as default for 64 bit kernels. */
 739 #endif
 740                 strcpy(elf_platform, "z900");
 741                 break;
 742         case 0x2084:
 743         case 0x2086:
 744                 strcpy(elf_platform, "z990");
 745                 break;
 746         case 0x2094:
 747                 strcpy(elf_platform, "z9-109");
 748                 break;
 749         }
 750 }
 751
 752 /*
 753  * Setup function called from init/main.c just after the banner
 754  * was printed.
 755  */
 756
 757 void __init
 758 setup_arch(char **cmdline_p)
 759 {
 760         /*
 761          * print what head.S has found out about the machine
 762          */
 763 #ifndef CONFIG_64BIT
 764         printk((MACHINE_IS_VM) ?
 765                "We are running under VM (31 bit mode)\n" :
 766                "We are running native (31 bit mode)\n");
 767         printk((MACHINE_HAS_IEEE) ?
 768                "This machine has an IEEE fpu\n" :
 769                "This machine has no IEEE fpu\n");
 770 #else /* CONFIG_64BIT */
 771         if (MACHINE_IS_VM)
 772                 printk("We are running under VM (64 bit mode)\n");
 773         else if (MACHINE_IS_KVM) {
 774                 printk("We are running under KVM (64 bit mode)\n");
 775                 add_preferred_console("ttyS", 1, NULL);
 776         } else
 777                 printk("We are running native (64 bit mode)\n");
 778 #endif /* CONFIG_64BIT */
 779
 780         /* Have one command line that is parsed and saved in /proc/cmdline */
 781         /* boot_command_line has been already set up in early.c */
 782         *cmdline_p = boot_command_line;
 783
 784         ROOT_DEV = Root_RAM0;
 785
 786         init_mm.start_code = PAGE_OFFSET;
 787         init_mm.end_code = (unsigned long) &_etext;
 788         init_mm.end_data = (unsigned long) &_edata;
 789         init_mm.brk = (unsigned long) &_end;
 790
 791         if (MACHINE_HAS_MVCOS)
 792                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 793         else
 794                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 795
 796         parse_early_param();
 797
 798         setup_ipl();
 799         setup_memory_end();
 800         setup_addressing_mode();
 801         setup_memory();
 802         setup_resources();
 803         setup_lowcore();
 804
 805         cpu_init();
 806         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 807         s390_init_cpu_topology();
 808
 809         /*
 810          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 811          */
 812         setup_hwcaps();
 813
 814         /*
 815          * Create kernel page tables and switch to virtual addressing.
 816          */
 817         paging_init();
 818
 819         /* Setup default console */
 820         conmode_default();
 821
 822         /* Setup zfcpdump support */
 823         setup_zfcpdump(console_devno);
 824 }
 825
 826 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 827 {
 828    printk(KERN_INFO "cpu %d "
 829 #ifdef CONFIG_SMP
 830            "phys_idx=%d "
 831 #endif
 832            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 833            cpuinfo->cpu_nr,
 834 #ifdef CONFIG_SMP
 835            cpuinfo->cpu_addr,
 836 #endif
 837            cpuinfo->cpu_id.version,
 838            cpuinfo->cpu_id.ident,
 839            cpuinfo->cpu_id.machine,
 840            cpuinfo->cpu_id.unused);
 841 }
 842
 843 /*
 844  * show_cpuinfo - Get information on one CPU for use by procfs.
 845  */
 846
 847 static int show_cpuinfo(struct seq_file *m, void *v)
 848 {
 849         static const char *hwcap_str[8] = {
 850                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 851                 "edat"
 852         };
 853         struct cpuinfo_S390 *cpuinfo;
 854         unsigned long n = (unsigned long) v - 1;
 855         int i;
 856
 857         s390_adjust_jiffies();
 858         preempt_disable();
 859         if (!n) {
 860                 seq_printf(m, "vendor_id       : IBM/S390\n"
 861                                "# processors    : %i\n"
 862                                "bogomips per cpu: %lu.%02lu\n",
 863                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 864                                (loops_per_jiffy/(5000/HZ))%100);
 865                 seq_puts(m, "features\t: ");
 866                 for (i = 0; i < 8; i++)
 867                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 868                                 seq_printf(m, "%s ", hwcap_str[i]);
 869                 seq_puts(m, "\n");
 870         }
 871
 872         if (cpu_online(n)) {
 873 #ifdef CONFIG_SMP
 874                 if (smp_processor_id() == n)
 875                         cpuinfo = &S390_lowcore.cpu_data;
 876                 else
 877                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 878 #else
 879                 cpuinfo = &S390_lowcore.cpu_data;
 880 #endif
 881                 seq_printf(m, "processor %li: "
 882                                "version = %02X,  "
 883                                "identification = %06X,  "
 884                                "machine = %04X\n",
 885                                n, cpuinfo->cpu_id.version,
 886                                cpuinfo->cpu_id.ident,
 887                                cpuinfo->cpu_id.machine);
 888         }
 889         preempt_enable();
 890         return 0;
 891 }
 892
 893 static void *c_start(struct seq_file *m, loff_t *pos)
 894 {
 895         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 896 }
 897 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 898 {
 899         ++*pos;
 900         return c_start(m, pos);
 901 }
 902 static void c_stop(struct seq_file *m, void *v)
 903 {
 904 }
 905 const struct seq_operations cpuinfo_op = {
 906         .start  = c_start,
 907         .next   = c_next,
 908         .stop   = c_stop,
 909         .show   = show_cpuinfo,
 910 };
 911