arch/ppc/kernel/setup.c

   1 /*
   2  * Common prep/pmac/chrp boot and setup code.
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/module.h>
   7 #include <linux/string.h>
   8 #include <linux/sched.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/reboot.h>
  12 #include <linux/delay.h>
  13 #include <linux/initrd.h>
  14 #include <linux/ide.h>
  15 #include <linux/tty.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/root_dev.h>
  19 #include <linux/cpu.h>
  20 #include <linux/console.h>
  21
  22 #include <asm/residual.h>
  23 #include <asm/io.h>
  24 #include <asm/prom.h>
  25 #include <asm/processor.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/bootinfo.h>
  28 #include <asm/setup.h>
  29 #include <asm/amigappc.h>
  30 #include <asm/smp.h>
  31 #include <asm/elf.h>
  32 #include <asm/cputable.h>
  33 #include <asm/bootx.h>
  34 #include <asm/btext.h>
  35 #include <asm/machdep.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/system.h>
  38 #include <asm/pmac_feature.h>
  39 #include <asm/sections.h>
  40 #include <asm/nvram.h>
  41 #include <asm/xmon.h>
  42 #include <asm/ocp.h>
  43
  44 #define USES_PPC_SYS (defined(CONFIG_85xx) || defined(CONFIG_83xx) || \
  45                       defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
  46                       defined(CONFIG_PPC_MPC52xx))
  47
  48 #if USES_PPC_SYS
  49 #include <asm/ppc_sys.h>
  50 #endif
  51
  52 #if defined CONFIG_KGDB
  53 #include <asm/kgdb.h>
  54 #endif
  55
  56 extern void platform_init(unsigned long r3, unsigned long r4,
  57                 unsigned long r5, unsigned long r6, unsigned long r7);
  58 extern void bootx_init(unsigned long r4, unsigned long phys);
  59 extern void identify_cpu(unsigned long offset, unsigned long cpu);
  60 extern void do_cpu_ftr_fixups(unsigned long offset);
  61 extern void reloc_got2(unsigned long offset);
  62
  63 extern void ppc6xx_idle(void);
  64 extern void power4_idle(void);
  65
  66 extern boot_infos_t *boot_infos;
  67 struct ide_machdep_calls ppc_ide_md;
  68
  69 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
  70    size value reported by the boot loader. */
  71 unsigned long boot_mem_size;
  72
  73 unsigned long ISA_DMA_THRESHOLD;
  74 unsigned long DMA_MODE_READ, DMA_MODE_WRITE;
  75
  76 #ifdef CONFIG_PPC_MULTIPLATFORM
  77 int _machine = 0;
  78
  79 extern void prep_init(unsigned long r3, unsigned long r4,
  80                 unsigned long r5, unsigned long r6, unsigned long r7);
  81 extern void pmac_init(unsigned long r3, unsigned long r4,
  82                 unsigned long r5, unsigned long r6, unsigned long r7);
  83 extern void chrp_init(unsigned long r3, unsigned long r4,
  84                 unsigned long r5, unsigned long r6, unsigned long r7);
  85 #endif /* CONFIG_PPC_MULTIPLATFORM */
  86
  87 #ifdef CONFIG_MAGIC_SYSRQ
  88 unsigned long SYSRQ_KEY = 0x54;
  89 #endif /* CONFIG_MAGIC_SYSRQ */
  90
  91 #ifdef CONFIG_VGA_CONSOLE
  92 unsigned long vgacon_remap_base;
  93 #endif
  94
  95 struct machdep_calls ppc_md;
  96
  97 /*
  98  * These are used in binfmt_elf.c to put aux entries on the stack
  99  * for each elf executable being started.
 100  */
 101 int dcache_bsize;
 102 int icache_bsize;
 103 int ucache_bsize;
 104
 105 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
 106     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
 107 struct screen_info screen_info = {
 108         0, 25,                  /* orig-x, orig-y */
 109         0,                      /* unused */
 110         0,                      /* orig-video-page */
 111         0,                      /* orig-video-mode */
 112         80,                     /* orig-video-cols */
 113         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 114         25,                     /* orig-video-lines */
 115         1,                      /* orig-video-isVGA */
 116         16                      /* orig-video-points */
 117 };
 118 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 119
 120 void machine_restart(char *cmd)
 121 {
 122 #ifdef CONFIG_NVRAM
 123         nvram_sync();
 124 #endif
 125         ppc_md.restart(cmd);
 126 }
 127
 128 void machine_power_off(void)
 129 {
 130 #ifdef CONFIG_NVRAM
 131         nvram_sync();
 132 #endif
 133         ppc_md.power_off();
 134 }
 135
 136 void machine_halt(void)
 137 {
 138 #ifdef CONFIG_NVRAM
 139         nvram_sync();
 140 #endif
 141         ppc_md.halt();
 142 }
 143
 144 void (*pm_power_off)(void) = machine_power_off;
 145
 146 #ifdef CONFIG_TAU
 147 extern u32 cpu_temp(unsigned long cpu);
 148 extern u32 cpu_temp_both(unsigned long cpu);
 149 #endif /* CONFIG_TAU */
 150
 151 int show_cpuinfo(struct seq_file *m, void *v)
 152 {
 153         int i = (int) v - 1;
 154         int err = 0;
 155         unsigned int pvr;
 156         unsigned short maj, min;
 157         unsigned long lpj;
 158
 159         if (i >= NR_CPUS) {
 160                 /* Show summary information */
 161 #ifdef CONFIG_SMP
 162                 unsigned long bogosum = 0;
 163                 for (i = 0; i < NR_CPUS; ++i)
 164                         if (cpu_online(i))
 165                                 bogosum += cpu_data[i].loops_per_jiffy;
 166                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 167                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 168 #endif /* CONFIG_SMP */
 169
 170                 if (ppc_md.show_cpuinfo != NULL)
 171                         err = ppc_md.show_cpuinfo(m);
 172                 return err;
 173         }
 174
 175 #ifdef CONFIG_SMP
 176         if (!cpu_online(i))
 177                 return 0;
 178         pvr = cpu_data[i].pvr;
 179         lpj = cpu_data[i].loops_per_jiffy;
 180 #else
 181         pvr = mfspr(SPRN_PVR);
 182         lpj = loops_per_jiffy;
 183 #endif
 184
 185         seq_printf(m, "processor\t: %d\n", i);
 186         seq_printf(m, "cpu\t\t: ");
 187
 188         if (cur_cpu_spec[i]->pvr_mask)
 189                 seq_printf(m, "%s", cur_cpu_spec[i]->cpu_name);
 190         else
 191                 seq_printf(m, "unknown (%08x)", pvr);
 192 #ifdef CONFIG_ALTIVEC
 193         if (cur_cpu_spec[i]->cpu_features & CPU_FTR_ALTIVEC)
 194                 seq_printf(m, ", altivec supported");
 195 #endif
 196         seq_printf(m, "\n");
 197
 198 #ifdef CONFIG_TAU
 199         if (cur_cpu_spec[i]->cpu_features & CPU_FTR_TAU) {
 200 #ifdef CONFIG_TAU_AVERAGE
 201                 /* more straightforward, but potentially misleading */
 202                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 203                            cpu_temp(i));
 204 #else
 205                 /* show the actual temp sensor range */
 206                 u32 temp;
 207                 temp = cpu_temp_both(i);
 208                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 209                            temp & 0xff, temp >> 16);
 210 #endif
 211         }
 212 #endif /* CONFIG_TAU */
 213
 214         if (ppc_md.show_percpuinfo != NULL) {
 215                 err = ppc_md.show_percpuinfo(m, i);
 216                 if (err)
 217                         return err;
 218         }
 219
 220         /* If we are a Freescale core do a simple check so
 221          * we dont have to keep adding cases in the future */
 222         if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
 223                 maj = PVR_MAJ(pvr);
 224                 min = PVR_MIN(pvr);
 225         } else {
 226                 switch (PVR_VER(pvr)) {
 227                         case 0x0020:    /* 403 family */
 228                                 maj = PVR_MAJ(pvr) + 1;
 229                                 min = PVR_MIN(pvr);
 230                                 break;
 231                         case 0x1008:    /* 740P/750P ?? */
 232                                 maj = ((pvr >> 8) & 0xFF) - 1;
 233                                 min = pvr & 0xFF;
 234                                 break;
 235                         default:
 236                                 maj = (pvr >> 8) & 0xFF;
 237                                 min = pvr & 0xFF;
 238                                 break;
 239                 }
 240         }
 241
 242         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 243                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 244
 245         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 246                    lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
 247
 248 #if USES_PPC_SYS
 249         if (cur_ppc_sys_spec->ppc_sys_name)
 250                 seq_printf(m, "chipset\t\t: %s\n",
 251                         cur_ppc_sys_spec->ppc_sys_name);
 252 #endif
 253
 254 #ifdef CONFIG_SMP
 255         seq_printf(m, "\n");
 256 #endif
 257
 258         return 0;
 259 }
 260
 261 static void *c_start(struct seq_file *m, loff_t *pos)
 262 {
 263         int i = *pos;
 264
 265         return i <= NR_CPUS? (void *) (i + 1): NULL;
 266 }
 267
 268 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 269 {
 270         ++*pos;
 271         return c_start(m, pos);
 272 }
 273
 274 static void c_stop(struct seq_file *m, void *v)
 275 {
 276 }
 277
 278 struct seq_operations cpuinfo_op = {
 279         .start =c_start,
 280         .next = c_next,
 281         .stop = c_stop,
 282         .show = show_cpuinfo,
 283 };
 284
 285 /*
 286  * We're called here very early in the boot.  We determine the machine
 287  * type and call the appropriate low-level setup functions.
 288  *  -- Cort <cort@fsmlabs.com>
 289  *
 290  * Note that the kernel may be running at an address which is different
 291  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 292  * to access static data (including strings).  -- paulus
 293  */
 294 __init
 295 unsigned long
 296 early_init(int r3, int r4, int r5)
 297 {
 298         unsigned long phys;
 299         unsigned long offset = reloc_offset();
 300
 301         /* Default */
 302         phys = offset + KERNELBASE;
 303
 304         /* First zero the BSS -- use memset, some arches don't have
 305          * caches on yet */
 306         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 307
 308         /*
 309          * Identify the CPU type and fix up code sections
 310          * that depend on which cpu we have.
 311          */
 312         identify_cpu(offset, 0);
 313         do_cpu_ftr_fixups(offset);
 314
 315 #if defined(CONFIG_PPC_MULTIPLATFORM)
 316         reloc_got2(offset);
 317
 318         /* If we came here from BootX, clear the screen,
 319          * set up some pointers and return. */
 320         if ((r3 == 0x426f6f58) && (r5 == 0))
 321                 bootx_init(r4, phys);
 322
 323         /*
 324          * don't do anything on prep
 325          * for now, don't use bootinfo because it breaks yaboot 0.5
 326          * and assume that if we didn't find a magic number, we have OF
 327          */
 328         else if (*(unsigned long *)(0) != 0xdeadc0de)
 329                 phys = prom_init(r3, r4, (prom_entry)r5);
 330
 331         reloc_got2(-offset);
 332 #endif
 333
 334         return phys;
 335 }
 336
 337 #ifdef CONFIG_PPC_OF
 338 /*
 339  * Assume here that all clock rates are the same in a
 340  * smp system.  -- Cort
 341  */
 342 int __openfirmware
 343 of_show_percpuinfo(struct seq_file *m, int i)
 344 {
 345         struct device_node *cpu_node;
 346         u32 *fp;
 347         int s;
 348
 349         cpu_node = find_type_devices("cpu");
 350         if (!cpu_node)
 351                 return 0;
 352         for (s = 0; s < i && cpu_node->next; s++)
 353                 cpu_node = cpu_node->next;
 354         fp = (u32 *)get_property(cpu_node, "clock-frequency", NULL);
 355         if (fp)
 356                 seq_printf(m, "clock\t\t: %dMHz\n", *fp / 1000000);
 357         return 0;
 358 }
 359
 360 void __init
 361 intuit_machine_type(void)
 362 {
 363         char *model;
 364         struct device_node *root;
 365
 366         /* ask the OF info if we're a chrp or pmac */
 367         root = find_path_device("/");
 368         if (root != 0) {
 369                 /* assume pmac unless proven to be chrp -- Cort */
 370                 _machine = _MACH_Pmac;
 371                 model = get_property(root, "device_type", NULL);
 372                 if (model && !strncmp("chrp", model, 4))
 373                         _machine = _MACH_chrp;
 374                 else {
 375                         model = get_property(root, "model", NULL);
 376                         if (model && !strncmp(model, "IBM", 3))
 377                                 _machine = _MACH_chrp;
 378                 }
 379         }
 380 }
 381 #endif
 382
 383 #ifdef CONFIG_PPC_MULTIPLATFORM
 384 /*
 385  * The PPC_MULTIPLATFORM version of platform_init...
 386  */
 387 void __init
 388 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 389               unsigned long r6, unsigned long r7)
 390 {
 391 #ifdef CONFIG_BOOTX_TEXT
 392         if (boot_text_mapped) {
 393                 btext_clearscreen();
 394                 btext_welcome();
 395         }
 396 #endif
 397
 398         parse_bootinfo(find_bootinfo());
 399
 400         /* if we didn't get any bootinfo telling us what we are... */
 401         if (_machine == 0) {
 402                 /* prep boot loader tells us if we're prep or not */
 403                 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
 404                         _machine = _MACH_prep;
 405         }
 406
 407         /* not much more to do here, if prep */
 408         if (_machine == _MACH_prep) {
 409                 prep_init(r3, r4, r5, r6, r7);
 410                 return;
 411         }
 412
 413         /* prom_init has already been called from __start */
 414         if (boot_infos)
 415                 relocate_nodes();
 416
 417         /* If we aren't PReP, we can find out if we're Pmac
 418          * or CHRP with this. */
 419         if (_machine == 0)
 420                 intuit_machine_type();
 421
 422         /* finish_device_tree may need _machine defined. */
 423         finish_device_tree();
 424
 425         /*
 426          * If we were booted via quik, r3 points to the physical
 427          * address of the command-line parameters.
 428          * If we were booted from an xcoff image (i.e. netbooted or
 429          * booted from floppy), we get the command line from the
 430          * bootargs property of the /chosen node.
 431          * If an initial ramdisk is present, r3 and r4
 432          * are used for initrd_start and initrd_size,
 433          * otherwise they contain 0xdeadbeef.
 434          */
 435         if (r3 >= 0x4000 && r3 < 0x800000 && r4 == 0) {
 436                 strlcpy(cmd_line, (char *)r3 + KERNELBASE,
 437                         sizeof(cmd_line));
 438         } else if (boot_infos != 0) {
 439                 /* booted by BootX - check for ramdisk */
 440                 if (boot_infos->kernelParamsOffset != 0)
 441                         strlcpy(cmd_line, (char *) boot_infos
 442                                 + boot_infos->kernelParamsOffset,
 443                                 sizeof(cmd_line));
 444 #ifdef CONFIG_BLK_DEV_INITRD
 445                 if (boot_infos->ramDisk) {
 446                         initrd_start = (unsigned long) boot_infos
 447                                 + boot_infos->ramDisk;
 448                         initrd_end = initrd_start + boot_infos->ramDiskSize;
 449                         initrd_below_start_ok = 1;
 450                 }
 451 #endif
 452         } else {
 453                 struct device_node *chosen;
 454                 char *p;
 455
 456 #ifdef CONFIG_BLK_DEV_INITRD
 457                 if (r3 && r4 && r4 != 0xdeadbeef) {
 458                         if (r3 < KERNELBASE)
 459                                 r3 += KERNELBASE;
 460                         initrd_start = r3;
 461                         initrd_end = r3 + r4;
 462                         ROOT_DEV = Root_RAM0;
 463                         initrd_below_start_ok = 1;
 464                 }
 465 #endif
 466                 chosen = find_devices("chosen");
 467                 if (chosen != NULL) {
 468                         p = get_property(chosen, "bootargs", NULL);
 469                         if (p && *p) {
 470                                 strlcpy(cmd_line, p, sizeof(cmd_line));
 471                         }
 472                 }
 473         }
 474 #ifdef CONFIG_ADB
 475         if (strstr(cmd_line, "adb_sync")) {
 476                 extern int __adb_probe_sync;
 477                 __adb_probe_sync = 1;
 478         }
 479 #endif /* CONFIG_ADB */
 480
 481         switch (_machine) {
 482         case _MACH_Pmac:
 483                 pmac_init(r3, r4, r5, r6, r7);
 484                 break;
 485         case _MACH_chrp:
 486                 chrp_init(r3, r4, r5, r6, r7);
 487                 break;
 488         }
 489 }
 490
 491 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 492 extern char *of_stdout_device;
 493
 494 static int __init set_preferred_console(void)
 495 {
 496         struct device_node *prom_stdout;
 497         char *name;
 498         int offset = 0;
 499
 500         if (of_stdout_device == NULL)
 501                 return -ENODEV;
 502
 503         /* The user has requested a console so this is already set up. */
 504         if (strstr(saved_command_line, "console="))
 505                 return -EBUSY;
 506
 507         prom_stdout = find_path_device(of_stdout_device);
 508         if (!prom_stdout)
 509                 return -ENODEV;
 510
 511         name = (char *)get_property(prom_stdout, "name", NULL);
 512         if (!name)
 513                 return -ENODEV;
 514
 515         if (strcmp(name, "serial") == 0) {
 516                 int i;
 517                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
 518                 if (i > 8) {
 519                         switch (reg[1]) {
 520                                 case 0x3f8:
 521                                         offset = 0;
 522                                         break;
 523                                 case 0x2f8:
 524                                         offset = 1;
 525                                         break;
 526                                 case 0x898:
 527                                         offset = 2;
 528                                         break;
 529                                 case 0x890:
 530                                         offset = 3;
 531                                         break;
 532                                 default:
 533                                         /* We dont recognise the serial port */
 534                                         return -ENODEV;
 535                         }
 536                 }
 537         } else if (strcmp(name, "ch-a") == 0)
 538                 offset = 0;
 539         else if (strcmp(name, "ch-b") == 0)
 540                 offset = 1;
 541         else
 542                 return -ENODEV;
 543         return add_preferred_console("ttyS", offset, NULL);
 544 }
 545 console_initcall(set_preferred_console);
 546 #endif /* CONFIG_SERIAL_CORE_CONSOLE */
 547 #endif /* CONFIG_PPC_MULTIPLATFORM */
 548
 549 struct bi_record *find_bootinfo(void)
 550 {
 551         struct bi_record *rec;
 552
 553         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 554         if ( rec->tag != BI_FIRST ) {
 555                 /*
 556                  * This 0x10000 offset is a terrible hack but it will go away when
 557                  * we have the bootloader handle all the relocation and
 558                  * prom calls -- Cort
 559                  */
 560                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 561                 if ( rec->tag != BI_FIRST )
 562                         return NULL;
 563         }
 564         return rec;
 565 }
 566
 567 void parse_bootinfo(struct bi_record *rec)
 568 {
 569         if (rec == NULL || rec->tag != BI_FIRST)
 570                 return;
 571         while (rec->tag != BI_LAST) {
 572                 ulong *data = rec->data;
 573                 switch (rec->tag) {
 574                 case BI_CMD_LINE:
 575                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 576                         break;
 577 #ifdef CONFIG_BLK_DEV_INITRD
 578                 case BI_INITRD:
 579                         initrd_start = data[0] + KERNELBASE;
 580                         initrd_end = data[0] + data[1] + KERNELBASE;
 581                         break;
 582 #endif /* CONFIG_BLK_DEV_INITRD */
 583 #ifdef CONFIG_PPC_MULTIPLATFORM
 584                 case BI_MACHTYPE:
 585                         _machine = data[0];
 586                         break;
 587 #endif
 588                 case BI_MEMSIZE:
 589                         boot_mem_size = data[0];
 590                         break;
 591                 }
 592                 rec = (struct bi_record *)((ulong)rec + rec->size);
 593         }
 594 }
 595
 596 /*
 597  * Find out what kind of machine we're on and save any data we need
 598  * from the early boot process (devtree is copied on pmac by prom_init()).
 599  * This is called very early on the boot process, after a minimal
 600  * MMU environment has been set up but before MMU_init is called.
 601  */
 602 void __init
 603 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 604              unsigned long r6, unsigned long r7)
 605 {
 606 #ifdef CONFIG_CMDLINE
 607         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 608 #endif /* CONFIG_CMDLINE */
 609
 610 #ifdef CONFIG_6xx
 611         ppc_md.power_save = ppc6xx_idle;
 612 #endif
 613 #ifdef CONFIG_POWER4
 614         ppc_md.power_save = power4_idle;
 615 #endif
 616
 617         platform_init(r3, r4, r5, r6, r7);
 618
 619         if (ppc_md.progress)
 620                 ppc_md.progress("id mach(): done", 0x200);
 621 }
 622 #ifdef CONFIG_BOOKE_WDT
 623 /* Checks wdt=x and wdt_period=xx command-line option */
 624 int __init early_parse_wdt(char *p)
 625 {
 626         if (p && strncmp(p, "0", 1) != 0)
 627                booke_wdt_enabled = 1;
 628
 629         return 0;
 630 }
 631 early_param("wdt", early_parse_wdt);
 632
 633 int __init early_parse_wdt_period (char *p)
 634 {
 635         if (p)
 636                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 637
 638         return 0;
 639 }
 640 early_param("wdt_period", early_parse_wdt_period);
 641 #endif  /* CONFIG_BOOKE_WDT */
 642
 643 /* Checks "l2cr=xxxx" command-line option */
 644 int __init ppc_setup_l2cr(char *str)
 645 {
 646         if (cpu_has_feature(CPU_FTR_L2CR)) {
 647                 unsigned long val = simple_strtoul(str, NULL, 0);
 648                 printk(KERN_INFO "l2cr set to %lx\n", val);
 649                 _set_L2CR(0);           /* force invalidate by disable cache */
 650                 _set_L2CR(val);         /* and enable it */
 651         }
 652         return 1;
 653 }
 654 __setup("l2cr=", ppc_setup_l2cr);
 655
 656 #ifdef CONFIG_GENERIC_NVRAM
 657
 658 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 659 unsigned char nvram_read_byte(int addr)
 660 {
 661         if (ppc_md.nvram_read_val)
 662                 return ppc_md.nvram_read_val(addr);
 663         return 0xff;
 664 }
 665 EXPORT_SYMBOL(nvram_read_byte);
 666
 667 void nvram_write_byte(unsigned char val, int addr)
 668 {
 669         if (ppc_md.nvram_write_val)
 670                 ppc_md.nvram_write_val(addr, val);
 671 }
 672 EXPORT_SYMBOL(nvram_write_byte);
 673
 674 void nvram_sync(void)
 675 {
 676         if (ppc_md.nvram_sync)
 677                 ppc_md.nvram_sync();
 678 }
 679 EXPORT_SYMBOL(nvram_sync);
 680
 681 #endif /* CONFIG_NVRAM */
 682
 683 static struct cpu cpu_devices[NR_CPUS];
 684
 685 int __init ppc_init(void)
 686 {
 687         int i;
 688
 689         /* clear the progress line */
 690         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 691
 692         /* register CPU devices */
 693         for (i = 0; i < NR_CPUS; i++)
 694                 if (cpu_possible(i))
 695                         register_cpu(&cpu_devices[i], i, NULL);
 696
 697         /* call platform init */
 698         if (ppc_md.init != NULL) {
 699                 ppc_md.init();
 700         }
 701         return 0;
 702 }
 703
 704 arch_initcall(ppc_init);
 705
 706 /* Warning, IO base is not yet inited */
 707 void __init setup_arch(char **cmdline_p)
 708 {
 709         extern char *klimit;
 710         extern void do_init_bootmem(void);
 711
 712         /* so udelay does something sensible, assume <= 1000 bogomips */
 713         loops_per_jiffy = 500000000 / HZ;
 714
 715 #ifdef CONFIG_PPC_MULTIPLATFORM
 716         /* This could be called "early setup arch", it must be done
 717          * now because xmon need it
 718          */
 719         if (_machine == _MACH_Pmac)
 720                 pmac_feature_init();    /* New cool way */
 721 #endif
 722
 723 #ifdef CONFIG_XMON
 724         xmon_map_scc();
 725         if (strstr(cmd_line, "xmon"))
 726                 xmon(NULL);
 727 #endif /* CONFIG_XMON */
 728         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 729
 730 #if defined(CONFIG_KGDB)
 731         if (ppc_md.kgdb_map_scc)
 732                 ppc_md.kgdb_map_scc();
 733         set_debug_traps();
 734         if (strstr(cmd_line, "gdb")) {
 735                 if (ppc_md.progress)
 736                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 737                 printk("kgdb breakpoint activated\n");
 738                 breakpoint();
 739         }
 740 #endif
 741
 742         /*
 743          * Set cache line size based on type of cpu as a default.
 744          * Systems with OF can look in the properties on the cpu node(s)
 745          * for a possibly more accurate value.
 746          */
 747         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 748                 dcache_bsize = cur_cpu_spec[0]->dcache_bsize;
 749                 icache_bsize = cur_cpu_spec[0]->icache_bsize;
 750                 ucache_bsize = 0;
 751         } else
 752                 ucache_bsize = dcache_bsize = icache_bsize
 753                         = cur_cpu_spec[0]->dcache_bsize;
 754
 755         /* reboot on panic */
 756         panic_timeout = 180;
 757
 758         init_mm.start_code = PAGE_OFFSET;
 759         init_mm.end_code = (unsigned long) _etext;
 760         init_mm.end_data = (unsigned long) _edata;
 761         init_mm.brk = (unsigned long) klimit;
 762
 763         /* Save unparsed command line copy for /proc/cmdline */
 764         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 765         *cmdline_p = cmd_line;
 766
 767         parse_early_param();
 768
 769         /* set up the bootmem stuff with available memory */
 770         do_init_bootmem();
 771         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 772
 773 #ifdef CONFIG_PPC_OCP
 774         /* Initialize OCP device list */
 775         ocp_early_init();
 776         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 777 #endif
 778
 779 #ifdef CONFIG_DUMMY_CONSOLE
 780         conswitchp = &dummy_con;
 781 #endif
 782
 783         ppc_md.setup_arch();
 784         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 785
 786         paging_init();
 787
 788         /* this is for modules since _machine can be a define -- Cort */
 789         ppc_md.ppc_machine = _machine;
 790 }