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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/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  * Machine setup..
  55  */
  56 unsigned int console_mode = 0;
  57 unsigned int console_devno = -1;
  58 unsigned int console_irq = -1;
  59 unsigned long memory_size = 0;
  60 unsigned long machine_flags = 0;
  61 struct {
  62         unsigned long addr, size, type;
  63 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  64 #define CHUNK_READ_WRITE 0
  65 #define CHUNK_READ_ONLY 1
  66 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  67 unsigned long __initdata zholes_size[MAX_NR_ZONES];
  68 static unsigned long __initdata memory_end;
  69
  70 /*
  71  * This is set up by the setup-routine at boot-time
  72  * for S390 need to find out, what we have to setup
  73  * using address 0x10400 ...
  74  */
  75
  76 #include <asm/setup.h>
  77
  78 static struct resource code_resource = {
  79         .name  = "Kernel code",
  80         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  81 };
  82
  83 static struct resource data_resource = {
  84         .name = "Kernel data",
  85         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  86 };
  87
  88 /*
  89  * cpu_init() initializes state that is per-CPU.
  90  */
  91 void __devinit cpu_init (void)
  92 {
  93         int addr = hard_smp_processor_id();
  94
  95         /*
  96          * Store processor id in lowcore (used e.g. in timer_interrupt)
  97          */
  98         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
  99         S390_lowcore.cpu_data.cpu_addr = addr;
 100
 101         /*
 102          * Force FPU initialization:
 103          */
 104         clear_thread_flag(TIF_USEDFPU);
 105         clear_used_math();
 106
 107         atomic_inc(&init_mm.mm_count);
 108         current->active_mm = &init_mm;
 109         if (current->mm)
 110                 BUG();
 111         enter_lazy_tlb(&init_mm, current);
 112 }
 113
 114 /*
 115  * VM halt and poweroff setup routines
 116  */
 117 char vmhalt_cmd[128] = "";
 118 char vmpoff_cmd[128] = "";
 119 char vmpanic_cmd[128] = "";
 120
 121 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 122 {
 123         int sx, dx;
 124
 125         dx = 0;
 126         for (sx = 0; src[sx] != 0; sx++) {
 127                 if (src[sx] == '"') continue;
 128                 dst[dx++] = src[sx];
 129                 if (dx >= n) break;
 130         }
 131 }
 132
 133 static int __init vmhalt_setup(char *str)
 134 {
 135         strncpy_skip_quote(vmhalt_cmd, str, 127);
 136         vmhalt_cmd[127] = 0;
 137         return 1;
 138 }
 139
 140 __setup("vmhalt=", vmhalt_setup);
 141
 142 static int __init vmpoff_setup(char *str)
 143 {
 144         strncpy_skip_quote(vmpoff_cmd, str, 127);
 145         vmpoff_cmd[127] = 0;
 146         return 1;
 147 }
 148
 149 __setup("vmpoff=", vmpoff_setup);
 150
 151 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
 152                           void *data)
 153 {
 154         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
 155                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
 156
 157         return NOTIFY_OK;
 158 }
 159
 160 #define PANIC_PRI_VMPANIC       0
 161
 162 static struct notifier_block vmpanic_nb = {
 163         .notifier_call = vmpanic_notify,
 164         .priority = PANIC_PRI_VMPANIC
 165 };
 166
 167 static int __init vmpanic_setup(char *str)
 168 {
 169         static int register_done __initdata = 0;
 170
 171         strncpy_skip_quote(vmpanic_cmd, str, 127);
 172         vmpanic_cmd[127] = 0;
 173         if (!register_done) {
 174                 register_done = 1;
 175                 atomic_notifier_chain_register(&panic_notifier_list,
 176                                                &vmpanic_nb);
 177         }
 178         return 1;
 179 }
 180
 181 __setup("vmpanic=", vmpanic_setup);
 182
 183 /*
 184  * condev= and conmode= setup parameter.
 185  */
 186
 187 static int __init condev_setup(char *str)
 188 {
 189         int vdev;
 190
 191         vdev = simple_strtoul(str, &str, 0);
 192         if (vdev >= 0 && vdev < 65536) {
 193                 console_devno = vdev;
 194                 console_irq = -1;
 195         }
 196         return 1;
 197 }
 198
 199 __setup("condev=", condev_setup);
 200
 201 static int __init conmode_setup(char *str)
 202 {
 203 #if defined(CONFIG_SCLP_CONSOLE)
 204         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 205                 SET_CONSOLE_SCLP;
 206 #endif
 207 #if defined(CONFIG_TN3215_CONSOLE)
 208         if (strncmp(str, "3215", 5) == 0)
 209                 SET_CONSOLE_3215;
 210 #endif
 211 #if defined(CONFIG_TN3270_CONSOLE)
 212         if (strncmp(str, "3270", 5) == 0)
 213                 SET_CONSOLE_3270;
 214 #endif
 215         return 1;
 216 }
 217
 218 __setup("conmode=", conmode_setup);
 219
 220 static void __init conmode_default(void)
 221 {
 222         char query_buffer[1024];
 223         char *ptr;
 224
 225         if (MACHINE_IS_VM) {
 226                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 227                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 228                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 229                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 230                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 231                 ptr = strstr(query_buffer, "CONMODE");
 232                 /*
 233                  * Set the conmode to 3215 so that the device recognition
 234                  * will set the cu_type of the console to 3215. If the
 235                  * conmode is 3270 and we don't set it back then both
 236                  * 3215 and the 3270 driver will try to access the console
 237                  * device (3215 as console and 3270 as normal tty).
 238                  */
 239                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 240                 if (ptr == NULL) {
 241 #if defined(CONFIG_SCLP_CONSOLE)
 242                         SET_CONSOLE_SCLP;
 243 #endif
 244                         return;
 245                 }
 246                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 247 #if defined(CONFIG_TN3270_CONSOLE)
 248                         SET_CONSOLE_3270;
 249 #elif defined(CONFIG_TN3215_CONSOLE)
 250                         SET_CONSOLE_3215;
 251 #elif defined(CONFIG_SCLP_CONSOLE)
 252                         SET_CONSOLE_SCLP;
 253 #endif
 254                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 255 #if defined(CONFIG_TN3215_CONSOLE)
 256                         SET_CONSOLE_3215;
 257 #elif defined(CONFIG_TN3270_CONSOLE)
 258                         SET_CONSOLE_3270;
 259 #elif defined(CONFIG_SCLP_CONSOLE)
 260                         SET_CONSOLE_SCLP;
 261 #endif
 262                 }
 263         } else if (MACHINE_IS_P390) {
 264 #if defined(CONFIG_TN3215_CONSOLE)
 265                 SET_CONSOLE_3215;
 266 #elif defined(CONFIG_TN3270_CONSOLE)
 267                 SET_CONSOLE_3270;
 268 #endif
 269         } else {
 270 #if defined(CONFIG_SCLP_CONSOLE)
 271                 SET_CONSOLE_SCLP;
 272 #endif
 273         }
 274 }
 275
 276 #ifdef CONFIG_SMP
 277 extern void machine_restart_smp(char *);
 278 extern void machine_halt_smp(void);
 279 extern void machine_power_off_smp(void);
 280
 281 void (*_machine_restart)(char *command) = machine_restart_smp;
 282 void (*_machine_halt)(void) = machine_halt_smp;
 283 void (*_machine_power_off)(void) = machine_power_off_smp;
 284 #else
 285 /*
 286  * Reboot, halt and power_off routines for non SMP.
 287  */
 288 extern void reipl(unsigned long devno);
 289 extern void reipl_diag(void);
 290 static void do_machine_restart_nonsmp(char * __unused)
 291 {
 292         reipl_diag();
 293
 294         if (MACHINE_IS_VM)
 295                 cpcmd ("IPL", NULL, 0, NULL);
 296         else
 297                 reipl (0x10000 | S390_lowcore.ipl_device);
 298 }
 299
 300 static void do_machine_halt_nonsmp(void)
 301 {
 302         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 303                 cpcmd(vmhalt_cmd, NULL, 0, NULL);
 304         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 305 }
 306
 307 static void do_machine_power_off_nonsmp(void)
 308 {
 309         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 310                 cpcmd(vmpoff_cmd, NULL, 0, NULL);
 311         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 312 }
 313
 314 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 315 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 316 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 317 #endif
 318
 319  /*
 320  * Reboot, halt and power_off stubs. They just call _machine_restart,
 321  * _machine_halt or _machine_power_off.
 322  */
 323
 324 void machine_restart(char *command)
 325 {
 326         if (!in_interrupt() || oops_in_progress)
 327                 /*
 328                  * Only unblank the console if we are called in enabled
 329                  * context or a bust_spinlocks cleared the way for us.
 330                  */
 331                 console_unblank();
 332         _machine_restart(command);
 333 }
 334
 335 void machine_halt(void)
 336 {
 337         if (!in_interrupt() || oops_in_progress)
 338                 /*
 339                  * Only unblank the console if we are called in enabled
 340                  * context or a bust_spinlocks cleared the way for us.
 341                  */
 342                 console_unblank();
 343         _machine_halt();
 344 }
 345
 346 void machine_power_off(void)
 347 {
 348         if (!in_interrupt() || oops_in_progress)
 349                 /*
 350                  * Only unblank the console if we are called in enabled
 351                  * context or a bust_spinlocks cleared the way for us.
 352                  */
 353                 console_unblank();
 354         _machine_power_off();
 355 }
 356
 357 /*
 358  * Dummy power off function.
 359  */
 360 void (*pm_power_off)(void) = machine_power_off;
 361
 362 static void __init
 363 add_memory_hole(unsigned long start, unsigned long end)
 364 {
 365         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
 366
 367         if (end <= dma_pfn)
 368                 zholes_size[ZONE_DMA] += end - start + 1;
 369         else if (start > dma_pfn)
 370                 zholes_size[ZONE_NORMAL] += end - start + 1;
 371         else {
 372                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
 373                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
 374         }
 375 }
 376
 377 static int __init early_parse_mem(char *p)
 378 {
 379         memory_end = memparse(p, &p);
 380         return 0;
 381 }
 382 early_param("mem", early_parse_mem);
 383
 384 /*
 385  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 386  */
 387 static int __init early_parse_ipldelay(char *p)
 388 {
 389         unsigned long delay = 0;
 390
 391         delay = simple_strtoul(p, &p, 0);
 392
 393         switch (*p) {
 394         case 's':
 395         case 'S':
 396                 delay *= 1000000;
 397                 break;
 398         case 'm':
 399         case 'M':
 400                 delay *= 60 * 1000000;
 401         }
 402
 403         /* now wait for the requested amount of time */
 404         udelay(delay);
 405
 406         return 0;
 407 }
 408 early_param("ipldelay", early_parse_ipldelay);
 409
 410 static void __init
 411 setup_lowcore(void)
 412 {
 413         struct _lowcore *lc;
 414         int lc_pages;
 415
 416         /*
 417          * Setup lowcore for boot cpu
 418          */
 419         lc_pages = sizeof(void *) == 8 ? 2 : 1;
 420         lc = (struct _lowcore *)
 421                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 422         memset(lc, 0, lc_pages * PAGE_SIZE);
 423         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 424         lc->restart_psw.addr =
 425                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 426         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 427         lc->external_new_psw.addr =
 428                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 429         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 430         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 431         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 432         lc->program_new_psw.addr =
 433                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 434         lc->mcck_new_psw.mask =
 435                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 436         lc->mcck_new_psw.addr =
 437                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 438         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 439         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 440         lc->ipl_device = S390_lowcore.ipl_device;
 441         lc->jiffy_timer = -1LL;
 442         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 443         lc->async_stack = (unsigned long)
 444                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 445         lc->panic_stack = (unsigned long)
 446                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 447         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 448         lc->thread_info = (unsigned long) &init_thread_union;
 449 #ifndef CONFIG_64BIT
 450         if (MACHINE_HAS_IEEE) {
 451                 lc->extended_save_area_addr = (__u32)
 452                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 453                 /* enable extended save area */
 454                 ctl_set_bit(14, 29);
 455         }
 456 #endif
 457         set_prefix((u32)(unsigned long) lc);
 458 }
 459
 460 static void __init
 461 setup_resources(void)
 462 {
 463         struct resource *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 && memory_chunk[i].size > 0; i++) {
 472                 res = alloc_bootmem_low(sizeof(struct resource));
 473                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 474                 switch (memory_chunk[i].type) {
 475                 case CHUNK_READ_WRITE:
 476                         res->name = "System RAM";
 477                         break;
 478                 case CHUNK_READ_ONLY:
 479                         res->name = "System ROM";
 480                         res->flags |= IORESOURCE_READONLY;
 481                         break;
 482                 default:
 483                         res->name = "reserved";
 484                 }
 485                 res->start = memory_chunk[i].addr;
 486                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 487                 request_resource(&iomem_resource, res);
 488                 request_resource(res, &code_resource);
 489                 request_resource(res, &data_resource);
 490         }
 491 }
 492
 493 static void __init
 494 setup_memory(void)
 495 {
 496         unsigned long bootmap_size;
 497         unsigned long start_pfn, end_pfn, init_pfn;
 498         unsigned long last_rw_end;
 499         int i;
 500
 501         /*
 502          * partially used pages are not usable - thus
 503          * we are rounding upwards:
 504          */
 505         start_pfn = PFN_UP(__pa(&_end));
 506         end_pfn = max_pfn = PFN_DOWN(memory_end);
 507
 508         /* Initialize storage key for kernel pages */
 509         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
 510                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 511
 512 #ifdef CONFIG_BLK_DEV_INITRD
 513         /*
 514          * Move the initrd in case the bitmap of the bootmem allocater
 515          * would overwrite it.
 516          */
 517
 518         if (INITRD_START && INITRD_SIZE) {
 519                 unsigned long bmap_size;
 520                 unsigned long start;
 521
 522                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 523                 bmap_size = PFN_PHYS(bmap_size);
 524
 525                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 526                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 527
 528                         if (start + INITRD_SIZE > memory_end) {
 529                                 printk("initrd extends beyond end of memory "
 530                                        "(0x%08lx > 0x%08lx)\n"
 531                                        "disabling initrd\n",
 532                                        start + INITRD_SIZE, memory_end);
 533                                 INITRD_START = INITRD_SIZE = 0;
 534                         } else {
 535                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
 536                                        "size: %ld)\n",
 537                                        INITRD_START, start, INITRD_SIZE);
 538                                 memmove((void *) start, (void *) INITRD_START,
 539                                         INITRD_SIZE);
 540                                 INITRD_START = start;
 541                         }
 542                 }
 543         }
 544 #endif
 545
 546         /*
 547          * Initialize the boot-time allocator (with low memory only):
 548          */
 549         bootmap_size = init_bootmem(start_pfn, end_pfn);
 550
 551         /*
 552          * Register RAM areas with the bootmem allocator.
 553          */
 554         last_rw_end = start_pfn;
 555
 556         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 557                 unsigned long start_chunk, end_chunk;
 558
 559                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 560                         continue;
 561                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 562                 start_chunk >>= PAGE_SHIFT;
 563                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 564                 end_chunk >>= PAGE_SHIFT;
 565                 if (start_chunk < start_pfn)
 566                         start_chunk = start_pfn;
 567                 if (end_chunk > end_pfn)
 568                         end_chunk = end_pfn;
 569                 if (start_chunk < end_chunk) {
 570                         /* Initialize storage key for RAM pages */
 571                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
 572                              init_pfn++)
 573                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
 574                                                      PAGE_DEFAULT_KEY);
 575                         free_bootmem(start_chunk << PAGE_SHIFT,
 576                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 577                         if (last_rw_end < start_chunk)
 578                                 add_memory_hole(last_rw_end, start_chunk - 1);
 579                         last_rw_end = end_chunk;
 580                 }
 581         }
 582
 583         psw_set_key(PAGE_DEFAULT_KEY);
 584
 585         if (last_rw_end < end_pfn - 1)
 586                 add_memory_hole(last_rw_end, end_pfn - 1);
 587
 588         /*
 589          * Reserve the bootmem bitmap itself as well. We do this in two
 590          * steps (first step was init_bootmem()) because this catches
 591          * the (very unlikely) case of us accidentally initializing the
 592          * bootmem allocator with an invalid RAM area.
 593          */
 594         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 595
 596 #ifdef CONFIG_BLK_DEV_INITRD
 597         if (INITRD_START && INITRD_SIZE) {
 598                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 599                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 600                         initrd_start = INITRD_START;
 601                         initrd_end = initrd_start + INITRD_SIZE;
 602                 } else {
 603                         printk("initrd extends beyond end of memory "
 604                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 605                                initrd_start + INITRD_SIZE, memory_end);
 606                         initrd_start = initrd_end = 0;
 607                 }
 608         }
 609 #endif
 610 }
 611
 612 /*
 613  * Setup function called from init/main.c just after the banner
 614  * was printed.
 615  */
 616
 617 void __init
 618 setup_arch(char **cmdline_p)
 619 {
 620         /*
 621          * print what head.S has found out about the machine
 622          */
 623 #ifndef CONFIG_64BIT
 624         printk((MACHINE_IS_VM) ?
 625                "We are running under VM (31 bit mode)\n" :
 626                "We are running native (31 bit mode)\n");
 627         printk((MACHINE_HAS_IEEE) ?
 628                "This machine has an IEEE fpu\n" :
 629                "This machine has no IEEE fpu\n");
 630 #else /* CONFIG_64BIT */
 631         printk((MACHINE_IS_VM) ?
 632                "We are running under VM (64 bit mode)\n" :
 633                "We are running native (64 bit mode)\n");
 634 #endif /* CONFIG_64BIT */
 635
 636         /* Save unparsed command line copy for /proc/cmdline */
 637         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 638
 639         *cmdline_p = COMMAND_LINE;
 640         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
 641
 642         ROOT_DEV = Root_RAM0;
 643
 644         init_mm.start_code = PAGE_OFFSET;
 645         init_mm.end_code = (unsigned long) &_etext;
 646         init_mm.end_data = (unsigned long) &_edata;
 647         init_mm.brk = (unsigned long) &_end;
 648
 649         memory_end = memory_size;
 650
 651         parse_early_param();
 652
 653 #ifndef CONFIG_64BIT
 654         memory_end &= ~0x400000UL;
 655
 656         /*
 657          * We need some free virtual space to be able to do vmalloc.
 658          * On a machine with 2GB memory we make sure that we have at
 659          * least 128 MB free space for vmalloc.
 660          */
 661         if (memory_end > 1920*1024*1024)
 662                 memory_end = 1920*1024*1024;
 663 #else /* CONFIG_64BIT */
 664         memory_end &= ~0x200000UL;
 665 #endif /* CONFIG_64BIT */
 666
 667         setup_memory();
 668         setup_resources();
 669         setup_lowcore();
 670
 671         cpu_init();
 672         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 673         smp_setup_cpu_possible_map();
 674
 675         /*
 676          * Create kernel page tables and switch to virtual addressing.
 677          */
 678         paging_init();
 679
 680         /* Setup default console */
 681         conmode_default();
 682 }
 683
 684 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 685 {
 686    printk("cpu %d "
 687 #ifdef CONFIG_SMP
 688            "phys_idx=%d "
 689 #endif
 690            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 691            cpuinfo->cpu_nr,
 692 #ifdef CONFIG_SMP
 693            cpuinfo->cpu_addr,
 694 #endif
 695            cpuinfo->cpu_id.version,
 696            cpuinfo->cpu_id.ident,
 697            cpuinfo->cpu_id.machine,
 698            cpuinfo->cpu_id.unused);
 699 }
 700
 701 /*
 702  * show_cpuinfo - Get information on one CPU for use by procfs.
 703  */
 704
 705 static int show_cpuinfo(struct seq_file *m, void *v)
 706 {
 707         struct cpuinfo_S390 *cpuinfo;
 708         unsigned long n = (unsigned long) v - 1;
 709
 710         preempt_disable();
 711         if (!n) {
 712                 seq_printf(m, "vendor_id       : IBM/S390\n"
 713                                "# processors    : %i\n"
 714                                "bogomips per cpu: %lu.%02lu\n",
 715                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 716                                (loops_per_jiffy/(5000/HZ))%100);
 717         }
 718         if (cpu_online(n)) {
 719 #ifdef CONFIG_SMP
 720                 if (smp_processor_id() == n)
 721                         cpuinfo = &S390_lowcore.cpu_data;
 722                 else
 723                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 724 #else
 725                 cpuinfo = &S390_lowcore.cpu_data;
 726 #endif
 727                 seq_printf(m, "processor %li: "
 728                                "version = %02X,  "
 729                                "identification = %06X,  "
 730                                "machine = %04X\n",
 731                                n, cpuinfo->cpu_id.version,
 732                                cpuinfo->cpu_id.ident,
 733                                cpuinfo->cpu_id.machine);
 734         }
 735         preempt_enable();
 736         return 0;
 737 }
 738
 739 static void *c_start(struct seq_file *m, loff_t *pos)
 740 {
 741         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 742 }
 743 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 744 {
 745         ++*pos;
 746         return c_start(m, pos);
 747 }
 748 static void c_stop(struct seq_file *m, void *v)
 749 {
 750 }
 751 struct seq_operations cpuinfo_op = {
 752         .start  = c_start,
 753         .next   = c_next,
 754         .stop   = c_stop,
 755         .show   = show_cpuinfo,
 756 };
 757
 758 #define DEFINE_IPL_ATTR(_name, _format, _value)                 \
 759 static ssize_t ipl_##_name##_show(struct subsystem *subsys,     \
 760                 char *page)                                     \
 761 {                                                               \
 762         return sprintf(page, _format, _value);                  \
 763 }                                                               \
 764 static struct subsys_attribute ipl_##_name##_attr =             \
 765         __ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);
 766
 767 DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
 768                 IPL_PARMBLOCK_START->fcp.wwpn);
 769 DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
 770                 IPL_PARMBLOCK_START->fcp.lun);
 771 DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
 772                 IPL_PARMBLOCK_START->fcp.bootprog);
 773 DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
 774                 IPL_PARMBLOCK_START->fcp.br_lba);
 775
 776 enum ipl_type_type {
 777         ipl_type_unknown,
 778         ipl_type_ccw,
 779         ipl_type_fcp,
 780 };
 781
 782 static enum ipl_type_type
 783 get_ipl_type(void)
 784 {
 785         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 786
 787         if (!IPL_DEVNO_VALID)
 788                 return ipl_type_unknown;
 789         if (!IPL_PARMBLOCK_VALID)
 790                 return ipl_type_ccw;
 791         if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
 792                 return ipl_type_unknown;
 793         if (ipl->fcp.pbt != IPL_TYPE_FCP)
 794                 return ipl_type_unknown;
 795         return ipl_type_fcp;
 796 }
 797
 798 static ssize_t
 799 ipl_type_show(struct subsystem *subsys, char *page)
 800 {
 801         switch (get_ipl_type()) {
 802         case ipl_type_ccw:
 803                 return sprintf(page, "ccw\n");
 804         case ipl_type_fcp:
 805                 return sprintf(page, "fcp\n");
 806         default:
 807                 return sprintf(page, "unknown\n");
 808         }
 809 }
 810
 811 static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);
 812
 813 static ssize_t
 814 ipl_device_show(struct subsystem *subsys, char *page)
 815 {
 816         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 817
 818         switch (get_ipl_type()) {
 819         case ipl_type_ccw:
 820                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 821         case ipl_type_fcp:
 822                 return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
 823         default:
 824                 return 0;
 825         }
 826 }
 827
 828 static struct subsys_attribute ipl_device_attr =
 829         __ATTR(device, S_IRUGO, ipl_device_show, NULL);
 830
 831 static struct attribute *ipl_fcp_attrs[] = {
 832         &ipl_type_attr.attr,
 833         &ipl_device_attr.attr,
 834         &ipl_wwpn_attr.attr,
 835         &ipl_lun_attr.attr,
 836         &ipl_bootprog_attr.attr,
 837         &ipl_br_lba_attr.attr,
 838         NULL,
 839 };
 840
 841 static struct attribute_group ipl_fcp_attr_group = {
 842         .attrs = ipl_fcp_attrs,
 843 };
 844
 845 static struct attribute *ipl_ccw_attrs[] = {
 846         &ipl_type_attr.attr,
 847         &ipl_device_attr.attr,
 848         NULL,
 849 };
 850
 851 static struct attribute_group ipl_ccw_attr_group = {
 852         .attrs = ipl_ccw_attrs,
 853 };
 854
 855 static struct attribute *ipl_unknown_attrs[] = {
 856         &ipl_type_attr.attr,
 857         NULL,
 858 };
 859
 860 static struct attribute_group ipl_unknown_attr_group = {
 861         .attrs = ipl_unknown_attrs,
 862 };
 863
 864 static ssize_t
 865 ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
 866 {
 867         unsigned int size = IPL_PARMBLOCK_SIZE;
 868
 869         if (off > size)
 870                 return 0;
 871         if (off + count > size)
 872                 count = size - off;
 873
 874         memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
 875         return count;
 876 }
 877
 878 static struct bin_attribute ipl_parameter_attr = {
 879         .attr = {
 880                 .name = "binary_parameter",
 881                 .mode = S_IRUGO,
 882                 .owner = THIS_MODULE,
 883         },
 884         .size = PAGE_SIZE,
 885         .read = &ipl_parameter_read,
 886 };
 887
 888 static ssize_t
 889 ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
 890 {
 891         unsigned int size =  IPL_PARMBLOCK_START->fcp.scp_data_len;
 892         void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;
 893
 894         if (off > size)
 895                 return 0;
 896         if (off + count > size)
 897                 count = size - off;
 898
 899         memcpy(buf, scp_data + off, count);
 900         return count;
 901 }
 902
 903 static struct bin_attribute ipl_scp_data_attr = {
 904         .attr = {
 905                 .name = "scp_data",
 906                 .mode = S_IRUGO,
 907                 .owner = THIS_MODULE,
 908         },
 909         .size = PAGE_SIZE,
 910         .read = &ipl_scp_data_read,
 911 };
 912
 913 static decl_subsys(ipl, NULL, NULL);
 914
 915 static int ipl_register_fcp_files(void)
 916 {
 917         int rc;
 918
 919         rc = sysfs_create_group(&ipl_subsys.kset.kobj,
 920                                 &ipl_fcp_attr_group);
 921         if (rc)
 922                 goto out;
 923         rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 924                                    &ipl_parameter_attr);
 925         if (rc)
 926                 goto out_ipl_parm;
 927         rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
 928                                    &ipl_scp_data_attr);
 929         if (!rc)
 930                 goto out;
 931
 932         sysfs_remove_bin_file(&ipl_subsys.kset.kobj, &ipl_parameter_attr);
 933
 934 out_ipl_parm:
 935         sysfs_remove_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
 936 out:
 937         return rc;
 938 }
 939
 940 static int __init
 941 ipl_device_sysfs_register(void) {
 942         int rc;
 943
 944         rc = firmware_register(&ipl_subsys);
 945         if (rc)
 946                 goto out;
 947
 948         switch (get_ipl_type()) {
 949         case ipl_type_ccw:
 950                 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
 951                                         &ipl_ccw_attr_group);
 952                 break;
 953         case ipl_type_fcp:
 954                 rc = ipl_register_fcp_files();
 955                 break;
 956         default:
 957                 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
 958                                         &ipl_unknown_attr_group);
 959                 break;
 960         }
 961
 962         if (rc)
 963                 firmware_unregister(&ipl_subsys);
 964 out:
 965         return rc;
 966 }
 967
 968 __initcall(ipl_device_sysfs_register);