arch/s390/kernel/setup.c

   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/a.out.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/seq_file.h>
  37 #include <linux/kernel_stat.h>
  38 #include <linux/device.h>
  39 #include <linux/notifier.h>
  40 #include <linux/pfn.h>
  41
  42 #include <asm/uaccess.h>
  43 #include <asm/system.h>
  44 #include <asm/smp.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/cpcmd.h>
  47 #include <asm/lowcore.h>
  48 #include <asm/irq.h>
  49 #include <asm/page.h>
  50 #include <asm/ptrace.h>
  51 #include <asm/sections.h>
  52
  53 /*
  54  * User copy operations.
  55  */
  56 struct uaccess_ops uaccess;
  57 EXPORT_SYMBOL_GPL(uaccess);
  58
  59 /*
  60  * Machine setup..
  61  */
  62 unsigned int console_mode = 0;
  63 unsigned int console_devno = -1;
  64 unsigned int console_irq = -1;
  65 unsigned long memory_size = 0;
  66 unsigned long machine_flags = 0;
  67 struct {
  68         unsigned long addr, size, type;
  69 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  70 #define CHUNK_READ_WRITE 0
  71 #define CHUNK_READ_ONLY 1
  72 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  73 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  74 static unsigned long __initdata memory_end;
  75
  76 /*
  77  * This is set up by the setup-routine at boot-time
  78  * for S390 need to find out, what we have to setup
  79  * using address 0x10400 ...
  80  */
  81
  82 #include <asm/setup.h>
  83
  84 static struct resource code_resource = {
  85         .name  = "Kernel code",
  86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  87 };
  88
  89 static struct resource data_resource = {
  90         .name = "Kernel data",
  91         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  92 };
  93
  94 /*
  95  * cpu_init() initializes state that is per-CPU.
  96  */
  97 void __devinit cpu_init (void)
  98 {
  99         int addr = hard_smp_processor_id();
 100
 101         /*
 102          * Store processor id in lowcore (used e.g. in timer_interrupt)
 103          */
 104         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 105         S390_lowcore.cpu_data.cpu_addr = addr;
 106
 107         /*
 108          * Force FPU initialization:
 109          */
 110         clear_thread_flag(TIF_USEDFPU);
 111         clear_used_math();
 112
 113         atomic_inc(&init_mm.mm_count);
 114         current->active_mm = &init_mm;
 115         if (current->mm)
 116                 BUG();
 117         enter_lazy_tlb(&init_mm, current);
 118 }
 119
 120 /*
 121  * VM halt and poweroff setup routines
 122  */
 123 char vmhalt_cmd[128] = "";
 124 char vmpoff_cmd[128] = "";
 125 char vmpanic_cmd[128] = "";
 126
 127 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 128 {
 129         int sx, dx;
 130
 131         dx = 0;
 132         for (sx = 0; src[sx] != 0; sx++) {
 133                 if (src[sx] == '"') continue;
 134                 dst[dx++] = src[sx];
 135                 if (dx >= n) break;
 136         }
 137 }
 138
 139 static int __init vmhalt_setup(char *str)
 140 {
 141         strncpy_skip_quote(vmhalt_cmd, str, 127);
 142         vmhalt_cmd[127] = 0;
 143         return 1;
 144 }
 145
 146 __setup("vmhalt=", vmhalt_setup);
 147
 148 static int __init vmpoff_setup(char *str)
 149 {
 150         strncpy_skip_quote(vmpoff_cmd, str, 127);
 151         vmpoff_cmd[127] = 0;
 152         return 1;
 153 }
 154
 155 __setup("vmpoff=", vmpoff_setup);
 156
 157 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 158                           void *data)
 159 {
 160         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 161                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 162
 163         return NOTIFY_OK;
 164 }
 165
 166 #define PANIC_PRI_VMPANIC       0
 167
 168 static struct notifier_block vmpanic_nb = {
 169         .notifier_call = vmpanic_notify,
 170         .priority = PANIC_PRI_VMPANIC
 171 };
 172
 173 static int __init vmpanic_setup(char *str)
 174 {
 175         static int register_done __initdata = 0;
 176
 177         strncpy_skip_quote(vmpanic_cmd, str, 127);
 178         vmpanic_cmd[127] = 0;
 179         if (!register_done) {
 180                 register_done = 1;
 181                 atomic_notifier_chain_register(&panic_notifier_list,
 182                                                &vmpanic_nb);
 183         }
 184         return 1;
 185 }
 186
 187 __setup("vmpanic=", vmpanic_setup);
 188
 189 /*
 190  * condev= and conmode= setup parameter.
 191  */
 192
 193 static int __init condev_setup(char *str)
 194 {
 195         int vdev;
 196
 197         vdev = simple_strtoul(str, &str, 0);
 198         if (vdev >= 0 && vdev < 65536) {
 199                 console_devno = vdev;
 200                 console_irq = -1;
 201         }
 202         return 1;
 203 }
 204
 205 __setup("condev=", condev_setup);
 206
 207 static int __init conmode_setup(char *str)
 208 {
 209 #if defined(CONFIG_SCLP_CONSOLE)
 210         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 211                 SET_CONSOLE_SCLP;
 212 #endif
 213 #if defined(CONFIG_TN3215_CONSOLE)
 214         if (strncmp(str, "3215", 5) == 0)
 215                 SET_CONSOLE_3215;
 216 #endif
 217 #if defined(CONFIG_TN3270_CONSOLE)
 218         if (strncmp(str, "3270", 5) == 0)
 219                 SET_CONSOLE_3270;
 220 #endif
 221         return 1;
 222 }
 223
 224 __setup("conmode=", conmode_setup);
 225
 226 static void __init conmode_default(void)
 227 {
 228         char query_buffer[1024];
 229         char *ptr;
 230
 231         if (MACHINE_IS_VM) {
 232                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 233                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 234                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 235                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 236                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 237                 ptr = strstr(query_buffer, "CONMODE");
 238                 /*
 239                  * Set the conmode to 3215 so that the device recognition
 240                  * will set the cu_type of the console to 3215. If the
 241                  * conmode is 3270 and we don't set it back then both
 242                  * 3215 and the 3270 driver will try to access the console
 243                  * device (3215 as console and 3270 as normal tty).
 244                  */
 245                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 246                 if (ptr == NULL) {
 247 #if defined(CONFIG_SCLP_CONSOLE)
 248                         SET_CONSOLE_SCLP;
 249 #endif
 250                         return;
 251                 }
 252                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 253 #if defined(CONFIG_TN3270_CONSOLE)
 254                         SET_CONSOLE_3270;
 255 #elif defined(CONFIG_TN3215_CONSOLE)
 256                         SET_CONSOLE_3215;
 257 #elif defined(CONFIG_SCLP_CONSOLE)
 258                         SET_CONSOLE_SCLP;
 259 #endif
 260                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 261 #if defined(CONFIG_TN3215_CONSOLE)
 262                         SET_CONSOLE_3215;
 263 #elif defined(CONFIG_TN3270_CONSOLE)
 264                         SET_CONSOLE_3270;
 265 #elif defined(CONFIG_SCLP_CONSOLE)
 266                         SET_CONSOLE_SCLP;
 267 #endif
 268                 }
 269         } else if (MACHINE_IS_P390) {
 270 #if defined(CONFIG_TN3215_CONSOLE)
 271                 SET_CONSOLE_3215;
 272 #elif defined(CONFIG_TN3270_CONSOLE)
 273                 SET_CONSOLE_3270;
 274 #endif
 275         } else {
 276 #if defined(CONFIG_SCLP_CONSOLE)
 277                 SET_CONSOLE_SCLP;
 278 #endif
 279         }
 280 }
 281
 282 #ifdef CONFIG_SMP
 283 extern void machine_restart_smp(char *);
 284 extern void machine_halt_smp(void);
 285 extern void machine_power_off_smp(void);
 286
 287 void (*_machine_restart)(char *command) = machine_restart_smp;
 288 void (*_machine_halt)(void) = machine_halt_smp;
 289 void (*_machine_power_off)(void) = machine_power_off_smp;
 290 #else
 291 /*
 292  * Reboot, halt and power_off routines for non SMP.
 293  */
 294 static void do_machine_restart_nonsmp(char * __unused)
 295 {
 296         do_reipl();
 297 }
 298
 299 static void do_machine_halt_nonsmp(void)
 300 {
 301         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 302                 cpcmd(vmhalt_cmd, NULL, 0, NULL);
 303         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 304 }
 305
 306 static void do_machine_power_off_nonsmp(void)
 307 {
 308         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 309                 cpcmd(vmpoff_cmd, NULL, 0, NULL);
 310         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 311 }
 312
 313 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 314 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 315 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 316 #endif
 317
 318  /*
 319  * Reboot, halt and power_off stubs. They just call _machine_restart,
 320  * _machine_halt or _machine_power_off.
 321  */
 322
 323 void machine_restart(char *command)
 324 {
 325         if (!in_interrupt() || oops_in_progress)
 326                 /*
 327                  * Only unblank the console if we are called in enabled
 328                  * context or a bust_spinlocks cleared the way for us.
 329                  */
 330                 console_unblank();
 331         _machine_restart(command);
 332 }
 333
 334 void machine_halt(void)
 335 {
 336         if (!in_interrupt() || oops_in_progress)
 337                 /*
 338                  * Only unblank the console if we are called in enabled
 339                  * context or a bust_spinlocks cleared the way for us.
 340                  */
 341                 console_unblank();
 342         _machine_halt();
 343 }
 344
 345 void machine_power_off(void)
 346 {
 347         if (!in_interrupt() || oops_in_progress)
 348                 /*
 349                  * Only unblank the console if we are called in enabled
 350                  * context or a bust_spinlocks cleared the way for us.
 351                  */
 352                 console_unblank();
 353         _machine_power_off();
 354 }
 355
 356 /*
 357  * Dummy power off function.
 358  */
 359 void (*pm_power_off)(void) = machine_power_off;
 360
 361 static void __init
 362 add_memory_hole(unsigned long start, unsigned long end)
 363 {
 364         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 365
 366         if (end <= dma_pfn)
 367                 zholes_size[ZONE_DMA] += end - start + 1;
 368         else if (start > dma_pfn)
 369                 zholes_size[ZONE_NORMAL] += end - start + 1;
 370         else {
 371                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 372                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 373         }
 374 }
 375
 376 static int __init early_parse_mem(char *p)
 377 {
 378         memory_end = memparse(p, &p);
 379         return 0;
 380 }
 381 early_param("mem", early_parse_mem);
 382
 383 /*
 384  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 385  */
 386 static int __init early_parse_ipldelay(char *p)
 387 {
 388         unsigned long delay = 0;
 389
 390         delay = simple_strtoul(p, &p, 0);
 391
 392         switch (*p) {
 393         case 's':
 394         case 'S':
 395                 delay *= 1000000;
 396                 break;
 397         case 'm':
 398         case 'M':
 399                 delay *= 60 * 1000000;
 400         }
 401
 402         /* now wait for the requested amount of time */
 403         udelay(delay);
 404
 405         return 0;
 406 }
 407 early_param("ipldelay", early_parse_ipldelay);
 408
 409 static void __init
 410 setup_lowcore(void)
 411 {
 412         struct _lowcore *lc;
 413         int lc_pages;
 414
 415         /*
 416          * Setup lowcore for boot cpu
 417          */
 418         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 419         lc = (struct _lowcore *)
 420                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 421         memset(lc, 0, lc_pages * PAGE_SIZE);
 422         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 423         lc->restart_psw.addr =
 424                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 425         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 426         lc->external_new_psw.addr =
 427                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 428         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 429         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 430         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 431         lc->program_new_psw.addr =
 432                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 433         lc->mcck_new_psw.mask =
 434                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 435         lc->mcck_new_psw.addr =
 436                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 437         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 438         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 439         lc->ipl_device = S390_lowcore.ipl_device;
 440         lc->jiffy_timer = -1LL;
 441         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 442         lc->async_stack = (unsigned long)
 443                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 444         lc->panic_stack = (unsigned long)
 445                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 446         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 447         lc->thread_info = (unsigned long) &init_thread_union;
 448 #ifndef CONFIG_64BIT
 449         if (MACHINE_HAS_IEEE) {
 450                 lc->extended_save_area_addr = (__u32)
 451                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 452                 /* enable extended save area */
 453                 ctl_set_bit(14, 29);
 454         }
 455 #endif
 456         set_prefix((u32)(unsigned long) lc);
 457 }
 458
 459 static void __init
 460 setup_resources(void)
 461 {
 462         struct resource *res;
 463         int i;
 464
 465         code_resource.start = (unsigned long) &_text;
 466         code_resource.end = (unsigned long) &_etext - 1;
 467         data_resource.start = (unsigned long) &_etext;
 468         data_resource.end = (unsigned long) &_edata - 1;
 469
 470         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 471                 res = alloc_bootmem_low(sizeof(struct resource));
 472                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 473                 switch (memory_chunk[i].type) {
 474                 case CHUNK_READ_WRITE:
 475                         res->name = "System RAM";
 476                         break;
 477                 case CHUNK_READ_ONLY:
 478                         res->name = "System ROM";
 479                         res->flags |= IORESOURCE_READONLY;
 480                         break;
 481                 default:
 482                         res->name = "reserved";
 483                 }
 484                 res->start = memory_chunk[i].addr;
 485                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 486                 request_resource(&iomem_resource, res);
 487                 request_resource(res, &code_resource);
 488                 request_resource(res, &data_resource);
 489         }
 490 }
 491
 492 static void __init
 493 setup_memory(void)
 494 {
 495         unsigned long bootmap_size;
 496         unsigned long start_pfn, end_pfn, init_pfn;
 497         unsigned long last_rw_end;
 498         int i;
 499
 500         /*
 501          * partially used pages are not usable - thus
 502          * we are rounding upwards:
 503          */
 504         start_pfn = PFN_UP(__pa(&_end));
 505         end_pfn = max_pfn = PFN_DOWN(memory_end);
 506
 507         /* Initialize storage key for kernel pages */
 508         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 509                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 510
 511 #ifdef CONFIG_BLK_DEV_INITRD
 512         /*
 513          * Move the initrd in case the bitmap of the bootmem allocater
 514          * would overwrite it.
 515          */
 516
 517         if (INITRD_START && INITRD_SIZE) {
 518                 unsigned long bmap_size;
 519                 unsigned long start;
 520
 521                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 522                 bmap_size = PFN_PHYS(bmap_size);
 523
 524                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 525                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 526
 527                         if (start + INITRD_SIZE > memory_end) {
 528                                 printk("initrd extends beyond end of memory "
 529                                        "(0x%08lx > 0x%08lx)\n"
 530                                        "disabling initrd\n",
 531                                        start + INITRD_SIZE, memory_end);
 532                                 INITRD_START = INITRD_SIZE = 0;
 533                         } else {
 534                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 535                                        "size: %ld)\n",
 536                                        INITRD_START, start, INITRD_SIZE);
 537                                 memmove((void *) start, (void *) INITRD_START,
 538                                         INITRD_SIZE);
 539                                 INITRD_START = start;
 540                         }
 541                 }
 542         }
 543 #endif
 544
 545         /*
 546          * Initialize the boot-time allocator (with low memory only):
 547          */
 548         bootmap_size = init_bootmem(start_pfn, end_pfn);
 549
 550         /*
 551          * Register RAM areas with the bootmem allocator.
 552          */
 553         last_rw_end = start_pfn;
 554
 555         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 556                 unsigned long start_chunk, end_chunk;
 557
 558                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 559                         continue;
 560                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 561                 start_chunk >>= PAGE_SHIFT;
 562                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 563                 end_chunk >>= PAGE_SHIFT;
 564                 if (start_chunk < start_pfn)
 565                         start_chunk = start_pfn;
 566                 if (end_chunk > end_pfn)
 567                         end_chunk = end_pfn;
 568                 if (start_chunk < end_chunk) {
 569                         /* Initialize storage key for RAM pages */
 570                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 571                              init_pfn++)
 572                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 573                                                      PAGE_DEFAULT_KEY);
 574                         free_bootmem(start_chunk << PAGE_SHIFT,
 575                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 576                         if (last_rw_end < start_chunk)
 577                                 add_memory_hole(last_rw_end, start_chunk - 1);
 578                         last_rw_end = end_chunk;
 579                 }
 580         }
 581
 582         psw_set_key(PAGE_DEFAULT_KEY);
 583
 584         if (last_rw_end < end_pfn - 1)
 585                 add_memory_hole(last_rw_end, end_pfn - 1);
 586
 587         /*
 588          * Reserve the bootmem bitmap itself as well. We do this in two
 589          * steps (first step was init_bootmem()) because this catches
 590          * the (very unlikely) case of us accidentally initializing the
 591          * bootmem allocator with an invalid RAM area.
 592          */
 593         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 594
 595 #ifdef CONFIG_BLK_DEV_INITRD
 596         if (INITRD_START && INITRD_SIZE) {
 597                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 598                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 599                         initrd_start = INITRD_START;
 600                         initrd_end = initrd_start + INITRD_SIZE;
 601                 } else {
 602                         printk("initrd extends beyond end of memory "
 603                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 604                                initrd_start + INITRD_SIZE, memory_end);
 605                         initrd_start = initrd_end = 0;
 606                 }
 607         }
 608 #endif
 609 }
 610
 611 /*
 612  * Setup function called from init/main.c just after the banner
 613  * was printed.
 614  */
 615
 616 void __init
 617 setup_arch(char **cmdline_p)
 618 {
 619         /*
 620          * print what head.S has found out about the machine
 621          */
 622 #ifndef CONFIG_64BIT
 623         printk((MACHINE_IS_VM) ?
 624                "We are running under VM (31 bit mode)\n" :
 625                "We are running native (31 bit mode)\n");
 626         printk((MACHINE_HAS_IEEE) ?
 627                "This machine has an IEEE fpu\n" :
 628                "This machine has no IEEE fpu\n");
 629 #else /* CONFIG_64BIT */
 630         printk((MACHINE_IS_VM) ?
 631                "We are running under VM (64 bit mode)\n" :
 632                "We are running native (64 bit mode)\n");
 633 #endif /* CONFIG_64BIT */
 634
 635         /* Save unparsed command line copy for /proc/cmdline */
 636         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 637
 638         *cmdline_p = COMMAND_LINE;
 639         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 640
 641         ROOT_DEV = Root_RAM0;
 642
 643         init_mm.start_code = PAGE_OFFSET;
 644         init_mm.end_code = (unsigned long) &_etext;
 645         init_mm.end_data = (unsigned long) &_edata;
 646         init_mm.brk = (unsigned long) &_end;
 647
 648         memory_end = memory_size;
 649
 650         if (MACHINE_HAS_MVCOS)
 651                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 652         else
 653                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 654
 655         parse_early_param();
 656
 657 #ifndef CONFIG_64BIT
 658         memory_end &= ~0x400000UL;
 659
 660         /*
 661          * We need some free virtual space to be able to do vmalloc.
 662          * On a machine with 2GB memory we make sure that we have at
 663          * least 128 MB free space for vmalloc.
 664          */
 665         if (memory_end > 1920*1024*1024)
 666                 memory_end = 1920*1024*1024;
 667 #else /* CONFIG_64BIT */
 668         memory_end &= ~0x200000UL;
 669 #endif /* CONFIG_64BIT */
 670
 671         setup_memory();
 672         setup_resources();
 673         setup_lowcore();
 674
 675         cpu_init();
 676         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 677         smp_setup_cpu_possible_map();
 678
 679         /*
 680          * Create kernel page tables and switch to virtual addressing.
 681          */
 682         paging_init();
 683
 684         /* Setup default console */
 685         conmode_default();
 686 }
 687
 688 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 689 {
 690    printk("cpu %d "
 691 #ifdef CONFIG_SMP
 692            "phys_idx=%d "
 693 #endif
 694            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 695            cpuinfo->cpu_nr,
 696 #ifdef CONFIG_SMP
 697            cpuinfo->cpu_addr,
 698 #endif
 699            cpuinfo->cpu_id.version,
 700            cpuinfo->cpu_id.ident,
 701            cpuinfo->cpu_id.machine,
 702            cpuinfo->cpu_id.unused);
 703 }
 704
 705 /*
 706  * show_cpuinfo - Get information on one CPU for use by procfs.
 707  */
 708
 709 static int show_cpuinfo(struct seq_file *m, void *v)
 710 {
 711         struct cpuinfo_S390 *cpuinfo;
 712         unsigned long n = (unsigned long) v - 1;
 713
 714         preempt_disable();
 715         if (!n) {
 716                 seq_printf(m, "vendor_id       : IBM/S390\n"
 717                                "# processors    : %i\n"
 718                                "bogomips per cpu: %lu.%02lu\n",
 719                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 720                                (loops_per_jiffy/(5000/HZ))%100);
 721         }
 722         if (cpu_online(n)) {
 723 #ifdef CONFIG_SMP
 724                 if (smp_processor_id() == n)
 725                         cpuinfo = &S390_lowcore.cpu_data;
 726                 else
 727                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 728 #else
 729                 cpuinfo = &S390_lowcore.cpu_data;
 730 #endif
 731                 seq_printf(m, "processor %li: "
 732                                "version = %02X,  "
 733                                "identification = %06X,  "
 734                                "machine = %04X\n",
 735                                n, cpuinfo->cpu_id.version,
 736                                cpuinfo->cpu_id.ident,
 737                                cpuinfo->cpu_id.machine);
 738         }
 739         preempt_enable();
 740         return 0;
 741 }
 742
 743 static void *c_start(struct seq_file *m, loff_t *pos)
 744 {
 745         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 746 }
 747 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 748 {
 749         ++*pos;
 750         return c_start(m, pos);
 751 }
 752 static void c_stop(struct seq_file *m, void *v)
 753 {
 754 }
 755 struct seq_operations cpuinfo_op = {
 756         .start  = c_start,
 757         .next   = c_next,
 758         .stop   = c_stop,
 759         .show   = show_cpuinfo,
 760 };
 761