git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  32 #include <linux/init.h>
  33 #include <linux/initrd.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/root_dev.h>
  36 #include <linux/console.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/kernel_stat.h>
  39
  40 #include <asm/uaccess.h>
  41 #include <asm/system.h>
  42 #include <asm/smp.h>
  43 #include <asm/mmu_context.h>
  44 #include <asm/cpcmd.h>
  45 #include <asm/lowcore.h>
  46 #include <asm/irq.h>
  47 #include <asm/page.h>
  48 #include <asm/ptrace.h>
  49
  50 /*
  51  * Machine setup..
  52  */
  53 unsigned int console_mode = 0;
  54 unsigned int console_devno = -1;
  55 unsigned int console_irq = -1;
  56 unsigned long memory_size = 0;
  57 unsigned long machine_flags = 0;
  58 struct {
  59         unsigned long addr, size, type;
  60 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  61 #define CHUNK_READ_WRITE 0
  62 #define CHUNK_READ_ONLY 1
  63 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  64 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  65 static unsigned long __initdata memory_end;
  66
  67 /*
  68  * Setup options
  69  */
  70 extern int _text,_etext, _edata, _end;
  71
  72 /*
  73  * This is set up by the setup-routine at boot-time
  74  * for S390 need to find out, what we have to setup
  75  * using address 0x10400 ...
  76  */
  77
  78 #include <asm/setup.h>
  79
  80 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  81
  82 static struct resource code_resource = {
  83         .name  = "Kernel code",
  84         .start = (unsigned long) &_text,
  85         .end = (unsigned long) &_etext - 1,
  86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  87 };
  88
  89 static struct resource data_resource = {
  90         .name = "Kernel data",
  91         .start = (unsigned long) &_etext,
  92         .end = (unsigned long) &_edata - 1,
  93         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  94 };
  95
  96 /*
  97  * cpu_init() initializes state that is per-CPU.
  98  */
  99 void __devinit cpu_init (void)
 100 {
 101         int addr = hard_smp_processor_id();
 102
 103         /*
 104          * Store processor id in lowcore (used e.g. in timer_interrupt)
 105          */
 106         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
 107         S390_lowcore.cpu_data.cpu_addr = addr;
 108
 109         /*
 110          * Force FPU initialization:
 111          */
 112         clear_thread_flag(TIF_USEDFPU);
 113         clear_used_math();
 114
 115         atomic_inc(&init_mm.mm_count);
 116         current->active_mm = &init_mm;
 117         if (current->mm)
 118                 BUG();
 119         enter_lazy_tlb(&init_mm, current);
 120 }
 121
 122 /*
 123  * VM halt and poweroff setup routines
 124  */
 125 char vmhalt_cmd[128] = "";
 126 char vmpoff_cmd[128] = "";
 127
 128 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 129 {
 130         int sx, dx;
 131
 132         dx = 0;
 133         for (sx = 0; src[sx] != 0; sx++) {
 134                 if (src[sx] == '"') continue;
 135                 dst[dx++] = src[sx];
 136                 if (dx >= n) break;
 137         }
 138 }
 139
 140 static int __init vmhalt_setup(char *str)
 141 {
 142         strncpy_skip_quote(vmhalt_cmd, str, 127);
 143         vmhalt_cmd[127] = 0;
 144         return 1;
 145 }
 146
 147 __setup("vmhalt=", vmhalt_setup);
 148
 149 static int __init vmpoff_setup(char *str)
 150 {
 151         strncpy_skip_quote(vmpoff_cmd, str, 127);
 152         vmpoff_cmd[127] = 0;
 153         return 1;
 154 }
 155
 156 __setup("vmpoff=", vmpoff_setup);
 157
 158 /*
 159  * condev= and conmode= setup parameter.
 160  */
 161
 162 static int __init condev_setup(char *str)
 163 {
 164         int vdev;
 165
 166         vdev = simple_strtoul(str, &str, 0);
 167         if (vdev >= 0 && vdev < 65536) {
 168                 console_devno = vdev;
 169                 console_irq = -1;
 170         }
 171         return 1;
 172 }
 173
 174 __setup("condev=", condev_setup);
 175
 176 static int __init conmode_setup(char *str)
 177 {
 178 #if defined(CONFIG_SCLP_CONSOLE)
 179         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 180                 SET_CONSOLE_SCLP;
 181 #endif
 182 #if defined(CONFIG_TN3215_CONSOLE)
 183         if (strncmp(str, "3215", 5) == 0)
 184                 SET_CONSOLE_3215;
 185 #endif
 186 #if defined(CONFIG_TN3270_CONSOLE)
 187         if (strncmp(str, "3270", 5) == 0)
 188                 SET_CONSOLE_3270;
 189 #endif
 190         return 1;
 191 }
 192
 193 __setup("conmode=", conmode_setup);
 194
 195 static void __init conmode_default(void)
 196 {
 197         char query_buffer[1024];
 198         char *ptr;
 199
 200         if (MACHINE_IS_VM) {
 201                 __cpcmd("QUERY CONSOLE", query_buffer, 1024);
 202                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 203                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 204                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 205                 __cpcmd("QUERY TERM", query_buffer, 1024);
 206                 ptr = strstr(query_buffer, "CONMODE");
 207                 /*
 208                  * Set the conmode to 3215 so that the device recognition
 209                  * will set the cu_type of the console to 3215. If the
 210                  * conmode is 3270 and we don't set it back then both
 211                  * 3215 and the 3270 driver will try to access the console
 212                  * device (3215 as console and 3270 as normal tty).
 213                  */
 214                 __cpcmd("TERM CONMODE 3215", NULL, 0);
 215                 if (ptr == NULL) {
 216 #if defined(CONFIG_SCLP_CONSOLE)
 217                         SET_CONSOLE_SCLP;
 218 #endif
 219                         return;
 220                 }
 221                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 222 #if defined(CONFIG_TN3270_CONSOLE)
 223                         SET_CONSOLE_3270;
 224 #elif defined(CONFIG_TN3215_CONSOLE)
 225                         SET_CONSOLE_3215;
 226 #elif defined(CONFIG_SCLP_CONSOLE)
 227                         SET_CONSOLE_SCLP;
 228 #endif
 229                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 230 #if defined(CONFIG_TN3215_CONSOLE)
 231                         SET_CONSOLE_3215;
 232 #elif defined(CONFIG_TN3270_CONSOLE)
 233                         SET_CONSOLE_3270;
 234 #elif defined(CONFIG_SCLP_CONSOLE)
 235                         SET_CONSOLE_SCLP;
 236 #endif
 237                 }
 238         } else if (MACHINE_IS_P390) {
 239 #if defined(CONFIG_TN3215_CONSOLE)
 240                 SET_CONSOLE_3215;
 241 #elif defined(CONFIG_TN3270_CONSOLE)
 242                 SET_CONSOLE_3270;
 243 #endif
 244         } else {
 245 #if defined(CONFIG_SCLP_CONSOLE)
 246                 SET_CONSOLE_SCLP;
 247 #endif
 248         }
 249 }
 250
 251 #ifdef CONFIG_SMP
 252 extern void machine_restart_smp(char *);
 253 extern void machine_halt_smp(void);
 254 extern void machine_power_off_smp(void);
 255
 256 void (*_machine_restart)(char *command) = machine_restart_smp;
 257 void (*_machine_halt)(void) = machine_halt_smp;
 258 void (*_machine_power_off)(void) = machine_power_off_smp;
 259 #else
 260 /*
 261  * Reboot, halt and power_off routines for non SMP.
 262  */
 263 extern void reipl(unsigned long devno);
 264 static void do_machine_restart_nonsmp(char * __unused)
 265 {
 266         if (MACHINE_IS_VM)
 267                 cpcmd ("IPL", NULL, 0);
 268         else
 269                 reipl (0x10000 | S390_lowcore.ipl_device);
 270 }
 271
 272 static void do_machine_halt_nonsmp(void)
 273 {
 274         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 275                 cpcmd(vmhalt_cmd, NULL, 0);
 276         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 277 }
 278
 279 static void do_machine_power_off_nonsmp(void)
 280 {
 281         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 282                 cpcmd(vmpoff_cmd, NULL, 0);
 283         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 284 }
 285
 286 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 287 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 288 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 289 #endif
 290
 291  /*
 292  * Reboot, halt and power_off stubs. They just call _machine_restart,
 293  * _machine_halt or _machine_power_off.
 294  */
 295
 296 void machine_restart(char *command)
 297 {
 298         console_unblank();
 299         _machine_restart(command);
 300 }
 301
 302 EXPORT_SYMBOL(machine_restart);
 303
 304 void machine_halt(void)
 305 {
 306         console_unblank();
 307         _machine_halt();
 308 }
 309
 310 EXPORT_SYMBOL(machine_halt);
 311
 312 void machine_power_off(void)
 313 {
 314         console_unblank();
 315         _machine_power_off();
 316 }
 317
 318 EXPORT_SYMBOL(machine_power_off);
 319
 320 static void __init
 321 add_memory_hole(unsigned long start, unsigned long end)
 322 {
 323         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 324
 325         if (end <= dma_pfn)
 326                 zholes_size[ZONE_DMA] += end - start + 1;
 327         else if (start > dma_pfn)
 328                 zholes_size[ZONE_NORMAL] += end - start + 1;
 329         else {
 330                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 331                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 332         }
 333 }
 334
 335 static void __init
 336 parse_cmdline_early(char **cmdline_p)
 337 {
 338         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
 339         unsigned long delay = 0;
 340
 341         /* Save unparsed command line copy for /proc/cmdline */
 342         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 343         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 344
 345         for (;;) {
 346                 /*
 347                  * "mem=XXX[kKmM]" sets memsize
 348                  */
 349                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
 350                         memory_end = simple_strtoul(from+4, &from, 0);
 351                         if ( *from == 'K' || *from == 'k' ) {
 352                                 memory_end = memory_end << 10;
 353                                 from++;
 354                         } else if ( *from == 'M' || *from == 'm' ) {
 355                                 memory_end = memory_end << 20;
 356                                 from++;
 357                         }
 358                 }
 359                 /*
 360                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 361                  */
 362                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
 363                         delay = simple_strtoul(from+9, &from, 0);
 364                         if (*from == 's' || *from == 'S') {
 365                                 delay = delay*1000000;
 366                                 from++;
 367                         } else if (*from == 'm' || *from == 'M') {
 368                                 delay = delay*60*1000000;
 369                                 from++;
 370                         }
 371                         /* now wait for the requested amount of time */
 372                         udelay(delay);
 373                 }
 374                 cn = *(from++);
 375                 if (!cn)
 376                         break;
 377                 if (cn == '\n')
 378                         cn = ' ';  /* replace newlines with space */
 379                 if (cn == 0x0d)
 380                         cn = ' ';  /* replace 0x0d with space */
 381                 if (cn == ' ' && c == ' ')
 382                         continue;  /* remove additional spaces */
 383                 c = cn;
 384                 if (to - command_line >= COMMAND_LINE_SIZE)
 385                         break;
 386                 *(to++) = c;
 387         }
 388         if (c == ' ' && to > command_line) to--;
 389         *to = '\0';
 390         *cmdline_p = command_line;
 391 }
 392
 393 static void __init
 394 setup_lowcore(void)
 395 {
 396         struct _lowcore *lc;
 397         int lc_pages;
 398
 399         /*
 400          * Setup lowcore for boot cpu
 401          */
 402         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 403         lc = (struct _lowcore *)
 404                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 405         memset(lc, 0, lc_pages * PAGE_SIZE);
 406         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 407         lc->restart_psw.addr =
 408                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 409         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 410         lc->external_new_psw.addr =
 411                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 412         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 413         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 414         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 415         lc->program_new_psw.addr =
 416                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 417         lc->mcck_new_psw.mask =
 418                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 419         lc->mcck_new_psw.addr =
 420                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 421         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 422         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 423         lc->ipl_device = S390_lowcore.ipl_device;
 424         lc->jiffy_timer = -1LL;
 425         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 426         lc->async_stack = (unsigned long)
 427                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 428         lc->panic_stack = (unsigned long)
 429                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 430         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 431         lc->thread_info = (unsigned long) &init_thread_union;
 432 #ifndef CONFIG_ARCH_S390X
 433         if (MACHINE_HAS_IEEE) {
 434                 lc->extended_save_area_addr = (__u32)
 435                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 436                 /* enable extended save area */
 437                 ctl_set_bit(14, 29);
 438         }
 439 #endif
 440 #ifdef CONFIG_ARCH_S390X
 441         if (MACHINE_HAS_DIAG44)
 442                 lc->diag44_opcode = 0x83000044;
 443         else
 444                 lc->diag44_opcode = 0x07000700;
 445 #endif /* CONFIG_ARCH_S390X */
 446         set_prefix((u32)(unsigned long) lc);
 447 }
 448
 449 static void __init
 450 setup_resources(void)
 451 {
 452         struct resource *res;
 453         int i;
 454
 455         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 456                 res = alloc_bootmem_low(sizeof(struct resource));
 457                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 458                 switch (memory_chunk[i].type) {
 459                 case CHUNK_READ_WRITE:
 460                         res->name = "System RAM";
 461                         break;
 462                 case CHUNK_READ_ONLY:
 463                         res->name = "System ROM";
 464                         res->flags |= IORESOURCE_READONLY;
 465                         break;
 466                 default:
 467                         res->name = "reserved";
 468                 }
 469                 res->start = memory_chunk[i].addr;
 470                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 471                 request_resource(&iomem_resource, res);
 472                 request_resource(res, &code_resource);
 473                 request_resource(res, &data_resource);
 474         }
 475 }
 476
 477 static void __init
 478 setup_memory(void)
 479 {
 480         unsigned long bootmap_size;
 481         unsigned long start_pfn, end_pfn, init_pfn;
 482         unsigned long last_rw_end;
 483         int i;
 484
 485         /*
 486          * partially used pages are not usable - thus
 487          * we are rounding upwards:
 488          */
 489         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
 490         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
 491
 492         /* Initialize storage key for kernel pages */
 493         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 494                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 495
 496         /*
 497          * Initialize the boot-time allocator (with low memory only):
 498          */
 499         bootmap_size = init_bootmem(start_pfn, end_pfn);
 500
 501         /*
 502          * Register RAM areas with the bootmem allocator.
 503          */
 504         last_rw_end = start_pfn;
 505
 506         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 507                 unsigned long start_chunk, end_chunk;
 508
 509                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 510                         continue;
 511                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 512                 start_chunk >>= PAGE_SHIFT;
 513                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 514                 end_chunk >>= PAGE_SHIFT;
 515                 if (start_chunk < start_pfn)
 516                         start_chunk = start_pfn;
 517                 if (end_chunk > end_pfn)
 518                         end_chunk = end_pfn;
 519                 if (start_chunk < end_chunk) {
 520                         /* Initialize storage key for RAM pages */
 521                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 522                              init_pfn++)
 523                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 524                                                      PAGE_DEFAULT_KEY);
 525                         free_bootmem(start_chunk << PAGE_SHIFT,
 526                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 527                         if (last_rw_end < start_chunk)
 528                                 add_memory_hole(last_rw_end, start_chunk - 1);
 529                         last_rw_end = end_chunk;
 530                 }
 531         }
 532
 533         psw_set_key(PAGE_DEFAULT_KEY);
 534
 535         if (last_rw_end < end_pfn - 1)
 536                 add_memory_hole(last_rw_end, end_pfn - 1);
 537
 538         /*
 539          * Reserve the bootmem bitmap itself as well. We do this in two
 540          * steps (first step was init_bootmem()) because this catches
 541          * the (very unlikely) case of us accidentally initializing the
 542          * bootmem allocator with an invalid RAM area.
 543          */
 544         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 545
 546 #ifdef CONFIG_BLK_DEV_INITRD
 547         if (INITRD_START) {
 548                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 549                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 550                         initrd_start = INITRD_START;
 551                         initrd_end = initrd_start + INITRD_SIZE;
 552                 } else {
 553                         printk("initrd extends beyond end of memory "
 554                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 555                                initrd_start + INITRD_SIZE, memory_end);
 556                         initrd_start = initrd_end = 0;
 557                 }
 558         }
 559 #endif
 560 }
 561
 562 /*
 563  * Setup function called from init/main.c just after the banner
 564  * was printed.
 565  */
 566
 567 void __init
 568 setup_arch(char **cmdline_p)
 569 {
 570         /*
 571          * print what head.S has found out about the machine
 572          */
 573 #ifndef CONFIG_ARCH_S390X
 574         printk((MACHINE_IS_VM) ?
 575                "We are running under VM (31 bit mode)\n" :
 576                "We are running native (31 bit mode)\n");
 577         printk((MACHINE_HAS_IEEE) ?
 578                "This machine has an IEEE fpu\n" :
 579                "This machine has no IEEE fpu\n");
 580 #else /* CONFIG_ARCH_S390X */
 581         printk((MACHINE_IS_VM) ?
 582                "We are running under VM (64 bit mode)\n" :
 583                "We are running native (64 bit mode)\n");
 584 #endif /* CONFIG_ARCH_S390X */
 585
 586         ROOT_DEV = Root_RAM0;
 587 #ifndef CONFIG_ARCH_S390X
 588         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
 589         /*
 590          * We need some free virtual space to be able to do vmalloc.
 591          * On a machine with 2GB memory we make sure that we have at
 592          * least 128 MB free space for vmalloc.
 593          */
 594         if (memory_end > 1920*1024*1024)
 595                 memory_end = 1920*1024*1024;
 596 #else /* CONFIG_ARCH_S390X */
 597         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
 598 #endif /* CONFIG_ARCH_S390X */
 599
 600         init_mm.start_code = PAGE_OFFSET;
 601         init_mm.end_code = (unsigned long) &_etext;
 602         init_mm.end_data = (unsigned long) &_edata;
 603         init_mm.brk = (unsigned long) &_end;
 604
 605         parse_cmdline_early(cmdline_p);
 606
 607         setup_memory();
 608         setup_resources();
 609         setup_lowcore();
 610
 611         cpu_init();
 612         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 613
 614         /*
 615          * Create kernel page tables and switch to virtual addressing.
 616          */
 617         paging_init();
 618
 619         /* Setup default console */
 620         conmode_default();
 621 }
 622
 623 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 624 {
 625    printk("cpu %d "
 626 #ifdef CONFIG_SMP
 627            "phys_idx=%d "
 628 #endif
 629            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 630            cpuinfo->cpu_nr,
 631 #ifdef CONFIG_SMP
 632            cpuinfo->cpu_addr,
 633 #endif
 634            cpuinfo->cpu_id.version,
 635            cpuinfo->cpu_id.ident,
 636            cpuinfo->cpu_id.machine,
 637            cpuinfo->cpu_id.unused);
 638 }
 639
 640 /*
 641  * show_cpuinfo - Get information on one CPU for use by procfs.
 642  */
 643
 644 static int show_cpuinfo(struct seq_file *m, void *v)
 645 {
 646         struct cpuinfo_S390 *cpuinfo;
 647         unsigned long n = (unsigned long) v - 1;
 648
 649         if (!n) {
 650                 seq_printf(m, "vendor_id       : IBM/S390\n"
 651                                "# processors    : %i\n"
 652                                "bogomips per cpu: %lu.%02lu\n",
 653                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 654                                (loops_per_jiffy/(5000/HZ))%100);
 655         }
 656         if (cpu_online(n)) {
 657 #ifdef CONFIG_SMP
 658                 if (smp_processor_id() == n)
 659                         cpuinfo = &S390_lowcore.cpu_data;
 660                 else
 661                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 662 #else
 663                 cpuinfo = &S390_lowcore.cpu_data;
 664 #endif
 665                 seq_printf(m, "processor %li: "
 666                                "version = %02X,  "
 667                                "identification = %06X,  "
 668                                "machine = %04X\n",
 669                                n, cpuinfo->cpu_id.version,
 670                                cpuinfo->cpu_id.ident,
 671                                cpuinfo->cpu_id.machine);
 672         }
 673         return 0;
 674 }
 675
 676 static void *c_start(struct seq_file *m, loff_t *pos)
 677 {
 678         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 679 }
 680 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 681 {
 682         ++*pos;
 683         return c_start(m, pos);
 684 }
 685 static void c_stop(struct seq_file *m, void *v)
 686 {
 687 }
 688 struct seq_operations cpuinfo_op = {
 689         .start  = c_start,
 690         .next   = c_next,
 691         .stop   = c_stop,
 692         .show   = show_cpuinfo,
 693 };
 694