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 #if defined(CONFIG_85xx) || defined(CONFIG_83xx) || defined(CONFIG_MPC10X_BRIDGE)
  45 #include <asm/ppc_sys.h>
  46 #endif
  47
  48 #if defined CONFIG_KGDB
  49 #include <asm/kgdb.h>
  50 #endif
  51
  52 extern void platform_init(unsigned long r3, unsigned long r4,
  53                 unsigned long r5, unsigned long r6, unsigned long r7);
  54 extern void bootx_init(unsigned long r4, unsigned long phys);
  55 extern void identify_cpu(unsigned long offset, unsigned long cpu);
  56 extern void do_cpu_ftr_fixups(unsigned long offset);
  57 extern void reloc_got2(unsigned long offset);
  58
  59 extern void ppc6xx_idle(void);
  60 extern void power4_idle(void);
  61
  62 extern boot_infos_t *boot_infos;
  63 struct ide_machdep_calls ppc_ide_md;
  64
  65 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
  66    size value reported by the boot loader. */
  67 unsigned long boot_mem_size;
  68
  69 unsigned long ISA_DMA_THRESHOLD;
  70 unsigned long DMA_MODE_READ, DMA_MODE_WRITE;
  71
  72 #ifdef CONFIG_PPC_MULTIPLATFORM
  73 int _machine = 0;
  74
  75 extern void prep_init(unsigned long r3, unsigned long r4,
  76                 unsigned long r5, unsigned long r6, unsigned long r7);
  77 extern void pmac_init(unsigned long r3, unsigned long r4,
  78                 unsigned long r5, unsigned long r6, unsigned long r7);
  79 extern void chrp_init(unsigned long r3, unsigned long r4,
  80                 unsigned long r5, unsigned long r6, unsigned long r7);
  81 #endif /* CONFIG_PPC_MULTIPLATFORM */
  82
  83 #ifdef CONFIG_MAGIC_SYSRQ
  84 unsigned long SYSRQ_KEY = 0x54;
  85 #endif /* CONFIG_MAGIC_SYSRQ */
  86
  87 #ifdef CONFIG_VGA_CONSOLE
  88 unsigned long vgacon_remap_base;
  89 #endif
  90
  91 struct machdep_calls ppc_md;
  92
  93 /*
  94  * These are used in binfmt_elf.c to put aux entries on the stack
  95  * for each elf executable being started.
  96  */
  97 int dcache_bsize;
  98 int icache_bsize;
  99 int ucache_bsize;
 100
 101 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
 102     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
 103 struct screen_info screen_info = {
 104         0, 25,                  /* orig-x, orig-y */
 105         0,                      /* unused */
 106         0,                      /* orig-video-page */
 107         0,                      /* orig-video-mode */
 108         80,                     /* orig-video-cols */
 109         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 110         25,                     /* orig-video-lines */
 111         1,                      /* orig-video-isVGA */
 112         16                      /* orig-video-points */
 113 };
 114 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 115
 116 void machine_restart(char *cmd)
 117 {
 118 #ifdef CONFIG_NVRAM
 119         nvram_sync();
 120 #endif
 121         ppc_md.restart(cmd);
 122 }
 123
 124 void machine_power_off(void)
 125 {
 126 #ifdef CONFIG_NVRAM
 127         nvram_sync();
 128 #endif
 129         ppc_md.power_off();
 130 }
 131
 132 void machine_halt(void)
 133 {
 134 #ifdef CONFIG_NVRAM
 135         nvram_sync();
 136 #endif
 137         ppc_md.halt();
 138 }
 139
 140 void (*pm_power_off)(void) = machine_power_off;
 141
 142 #ifdef CONFIG_TAU
 143 extern u32 cpu_temp(unsigned long cpu);
 144 extern u32 cpu_temp_both(unsigned long cpu);
 145 #endif /* CONFIG_TAU */
 146
 147 int show_cpuinfo(struct seq_file *m, void *v)
 148 {
 149         int i = (int) v - 1;
 150         int err = 0;
 151         unsigned int pvr;
 152         unsigned short maj, min;
 153         unsigned long lpj;
 154
 155         if (i >= NR_CPUS) {
 156                 /* Show summary information */
 157 #ifdef CONFIG_SMP
 158                 unsigned long bogosum = 0;
 159                 for (i = 0; i < NR_CPUS; ++i)
 160                         if (cpu_online(i))
 161                                 bogosum += cpu_data[i].loops_per_jiffy;
 162                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 163                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 164 #endif /* CONFIG_SMP */
 165
 166                 if (ppc_md.show_cpuinfo != NULL)
 167                         err = ppc_md.show_cpuinfo(m);
 168                 return err;
 169         }
 170
 171 #ifdef CONFIG_SMP
 172         if (!cpu_online(i))
 173                 return 0;
 174         pvr = cpu_data[i].pvr;
 175         lpj = cpu_data[i].loops_per_jiffy;
 176 #else
 177         pvr = mfspr(SPRN_PVR);
 178         lpj = loops_per_jiffy;
 179 #endif
 180
 181         seq_printf(m, "processor\t: %d\n", i);
 182         seq_printf(m, "cpu\t\t: ");
 183
 184         if (cur_cpu_spec[i]->pvr_mask)
 185                 seq_printf(m, "%s", cur_cpu_spec[i]->cpu_name);
 186         else
 187                 seq_printf(m, "unknown (%08x)", pvr);
 188 #ifdef CONFIG_ALTIVEC
 189         if (cur_cpu_spec[i]->cpu_features & CPU_FTR_ALTIVEC)
 190                 seq_printf(m, ", altivec supported");
 191 #endif
 192         seq_printf(m, "\n");
 193
 194 #ifdef CONFIG_TAU
 195         if (cur_cpu_spec[i]->cpu_features & CPU_FTR_TAU) {
 196 #ifdef CONFIG_TAU_AVERAGE
 197                 /* more straightforward, but potentially misleading */
 198                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 199                            cpu_temp(i));
 200 #else
 201                 /* show the actual temp sensor range */
 202                 u32 temp;
 203                 temp = cpu_temp_both(i);
 204                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 205                            temp & 0xff, temp >> 16);
 206 #endif
 207         }
 208 #endif /* CONFIG_TAU */
 209
 210         if (ppc_md.show_percpuinfo != NULL) {
 211                 err = ppc_md.show_percpuinfo(m, i);
 212                 if (err)
 213                         return err;
 214         }
 215
 216         /* If we are a Freescale core do a simple check so
 217          * we dont have to keep adding cases in the future */
 218         if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
 219                 maj = PVR_MAJ(pvr);
 220                 min = PVR_MIN(pvr);
 221         } else {
 222                 switch (PVR_VER(pvr)) {
 223                         case 0x0020:    /* 403 family */
 224                                 maj = PVR_MAJ(pvr) + 1;
 225                                 min = PVR_MIN(pvr);
 226                                 break;
 227                         case 0x1008:    /* 740P/750P ?? */
 228                                 maj = ((pvr >> 8) & 0xFF) - 1;
 229                                 min = pvr & 0xFF;
 230                                 break;
 231                         default:
 232                                 maj = (pvr >> 8) & 0xFF;
 233                                 min = pvr & 0xFF;
 234                                 break;
 235                 }
 236         }
 237
 238         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 239                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 240
 241         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 242                    lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
 243
 244 #if defined(CONFIG_85xx) || defined(CONFIG_83xx) || defined(CONFIG_MPC10X_BRIDGE)
 245         if (cur_ppc_sys_spec->ppc_sys_name)
 246                 seq_printf(m, "chipset\t\t: %s\n",
 247                         cur_ppc_sys_spec->ppc_sys_name);
 248 #endif
 249
 250 #ifdef CONFIG_SMP
 251         seq_printf(m, "\n");
 252 #endif
 253
 254         return 0;
 255 }
 256
 257 static void *c_start(struct seq_file *m, loff_t *pos)
 258 {
 259         int i = *pos;
 260
 261         return i <= NR_CPUS? (void *) (i + 1): NULL;
 262 }
 263
 264 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 265 {
 266         ++*pos;
 267         return c_start(m, pos);
 268 }
 269
 270 static void c_stop(struct seq_file *m, void *v)
 271 {
 272 }
 273
 274 struct seq_operations cpuinfo_op = {
 275         .start =c_start,
 276         .next = c_next,
 277         .stop = c_stop,
 278         .show = show_cpuinfo,
 279 };
 280
 281 /*
 282  * We're called here very early in the boot.  We determine the machine
 283  * type and call the appropriate low-level setup functions.
 284  *  -- Cort <cort@fsmlabs.com>
 285  *
 286  * Note that the kernel may be running at an address which is different
 287  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 288  * to access static data (including strings).  -- paulus
 289  */
 290 __init
 291 unsigned long
 292 early_init(int r3, int r4, int r5)
 293 {
 294         unsigned long phys;
 295         unsigned long offset = reloc_offset();
 296
 297         /* Default */
 298         phys = offset + KERNELBASE;
 299
 300         /* First zero the BSS -- use memset, some arches don't have
 301          * caches on yet */
 302         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 303
 304         /*
 305          * Identify the CPU type and fix up code sections
 306          * that depend on which cpu we have.
 307          */
 308         identify_cpu(offset, 0);
 309         do_cpu_ftr_fixups(offset);
 310
 311 #if defined(CONFIG_PPC_MULTIPLATFORM)
 312         reloc_got2(offset);
 313
 314         /* If we came here from BootX, clear the screen,
 315          * set up some pointers and return. */
 316         if ((r3 == 0x426f6f58) && (r5 == 0))
 317                 bootx_init(r4, phys);
 318
 319         /*
 320          * don't do anything on prep
 321          * for now, don't use bootinfo because it breaks yaboot 0.5
 322          * and assume that if we didn't find a magic number, we have OF
 323          */
 324         else if (*(unsigned long *)(0) != 0xdeadc0de)
 325                 phys = prom_init(r3, r4, (prom_entry)r5);
 326
 327         reloc_got2(-offset);
 328 #endif
 329
 330         return phys;
 331 }
 332
 333 #ifdef CONFIG_PPC_OF
 334 /*
 335  * Assume here that all clock rates are the same in a
 336  * smp system.  -- Cort
 337  */
 338 int __openfirmware
 339 of_show_percpuinfo(struct seq_file *m, int i)
 340 {
 341         struct device_node *cpu_node;
 342         u32 *fp;
 343         int s;
 344
 345         cpu_node = find_type_devices("cpu");
 346         if (!cpu_node)
 347                 return 0;
 348         for (s = 0; s < i && cpu_node->next; s++)
 349                 cpu_node = cpu_node->next;
 350         fp = (u32 *)get_property(cpu_node, "clock-frequency", NULL);
 351         if (fp)
 352                 seq_printf(m, "clock\t\t: %dMHz\n", *fp / 1000000);
 353         return 0;
 354 }
 355
 356 void __init
 357 intuit_machine_type(void)
 358 {
 359         char *model;
 360         struct device_node *root;
 361
 362         /* ask the OF info if we're a chrp or pmac */
 363         root = find_path_device("/");
 364         if (root != 0) {
 365                 /* assume pmac unless proven to be chrp -- Cort */
 366                 _machine = _MACH_Pmac;
 367                 model = get_property(root, "device_type", NULL);
 368                 if (model && !strncmp("chrp", model, 4))
 369                         _machine = _MACH_chrp;
 370                 else {
 371                         model = get_property(root, "model", NULL);
 372                         if (model && !strncmp(model, "IBM", 3))
 373                                 _machine = _MACH_chrp;
 374                 }
 375         }
 376 }
 377 #endif
 378
 379 #ifdef CONFIG_PPC_MULTIPLATFORM
 380 /*
 381  * The PPC_MULTIPLATFORM version of platform_init...
 382  */
 383 void __init
 384 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 385               unsigned long r6, unsigned long r7)
 386 {
 387 #ifdef CONFIG_BOOTX_TEXT
 388         if (boot_text_mapped) {
 389                 btext_clearscreen();
 390                 btext_welcome();
 391         }
 392 #endif
 393
 394         parse_bootinfo(find_bootinfo());
 395
 396         /* if we didn't get any bootinfo telling us what we are... */
 397         if (_machine == 0) {
 398                 /* prep boot loader tells us if we're prep or not */
 399                 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
 400                         _machine = _MACH_prep;
 401         }
 402
 403         /* not much more to do here, if prep */
 404         if (_machine == _MACH_prep) {
 405                 prep_init(r3, r4, r5, r6, r7);
 406                 return;
 407         }
 408
 409         /* prom_init has already been called from __start */
 410         if (boot_infos)
 411                 relocate_nodes();
 412
 413         /* If we aren't PReP, we can find out if we're Pmac
 414          * or CHRP with this. */
 415         if (_machine == 0)
 416                 intuit_machine_type();
 417
 418         /* finish_device_tree may need _machine defined. */
 419         finish_device_tree();
 420
 421         /*
 422          * If we were booted via quik, r3 points to the physical
 423          * address of the command-line parameters.
 424          * If we were booted from an xcoff image (i.e. netbooted or
 425          * booted from floppy), we get the command line from the
 426          * bootargs property of the /chosen node.
 427          * If an initial ramdisk is present, r3 and r4
 428          * are used for initrd_start and initrd_size,
 429          * otherwise they contain 0xdeadbeef.
 430          */
 431         if (r3 >= 0x4000 && r3 < 0x800000 && r4 == 0) {
 432                 strlcpy(cmd_line, (char *)r3 + KERNELBASE,
 433                         sizeof(cmd_line));
 434         } else if (boot_infos != 0) {
 435                 /* booted by BootX - check for ramdisk */
 436                 if (boot_infos->kernelParamsOffset != 0)
 437                         strlcpy(cmd_line, (char *) boot_infos
 438                                 + boot_infos->kernelParamsOffset,
 439                                 sizeof(cmd_line));
 440 #ifdef CONFIG_BLK_DEV_INITRD
 441                 if (boot_infos->ramDisk) {
 442                         initrd_start = (unsigned long) boot_infos
 443                                 + boot_infos->ramDisk;
 444                         initrd_end = initrd_start + boot_infos->ramDiskSize;
 445                         initrd_below_start_ok = 1;
 446                 }
 447 #endif
 448         } else {
 449                 struct device_node *chosen;
 450                 char *p;
 451
 452 #ifdef CONFIG_BLK_DEV_INITRD
 453                 if (r3 && r4 && r4 != 0xdeadbeef) {
 454                         if (r3 < KERNELBASE)
 455                                 r3 += KERNELBASE;
 456                         initrd_start = r3;
 457                         initrd_end = r3 + r4;
 458                         ROOT_DEV = Root_RAM0;
 459                         initrd_below_start_ok = 1;
 460                 }
 461 #endif
 462                 chosen = find_devices("chosen");
 463                 if (chosen != NULL) {
 464                         p = get_property(chosen, "bootargs", NULL);
 465                         if (p && *p) {
 466                                 strlcpy(cmd_line, p, sizeof(cmd_line));
 467                         }
 468                 }
 469         }
 470 #ifdef CONFIG_ADB
 471         if (strstr(cmd_line, "adb_sync")) {
 472                 extern int __adb_probe_sync;
 473                 __adb_probe_sync = 1;
 474         }
 475 #endif /* CONFIG_ADB */
 476
 477         switch (_machine) {
 478         case _MACH_Pmac:
 479                 pmac_init(r3, r4, r5, r6, r7);
 480                 break;
 481         case _MACH_chrp:
 482                 chrp_init(r3, r4, r5, r6, r7);
 483                 break;
 484         }
 485 }
 486
 487 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 488 extern char *of_stdout_device;
 489
 490 static int __init set_preferred_console(void)
 491 {
 492         struct device_node *prom_stdout;
 493         char *name;
 494         int offset = 0;
 495
 496         if (of_stdout_device == NULL)
 497                 return -ENODEV;
 498
 499         /* The user has requested a console so this is already set up. */
 500         if (strstr(saved_command_line, "console="))
 501                 return -EBUSY;
 502
 503         prom_stdout = find_path_device(of_stdout_device);
 504         if (!prom_stdout)
 505                 return -ENODEV;
 506
 507         name = (char *)get_property(prom_stdout, "name", NULL);
 508         if (!name)
 509                 return -ENODEV;
 510
 511         if (strcmp(name, "serial") == 0) {
 512                 int i;
 513                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
 514                 if (i > 8) {
 515                         switch (reg[1]) {
 516                                 case 0x3f8:
 517                                         offset = 0;
 518                                         break;
 519                                 case 0x2f8:
 520                                         offset = 1;
 521                                         break;
 522                                 case 0x898:
 523                                         offset = 2;
 524                                         break;
 525                                 case 0x890:
 526                                         offset = 3;
 527                                         break;
 528                                 default:
 529                                         /* We dont recognise the serial port */
 530                                         return -ENODEV;
 531                         }
 532                 }
 533         } else if (strcmp(name, "ch-a") == 0)
 534                 offset = 0;
 535         else if (strcmp(name, "ch-b") == 0)
 536                 offset = 1;
 537         else
 538                 return -ENODEV;
 539         return add_preferred_console("ttyS", offset, NULL);
 540 }
 541 console_initcall(set_preferred_console);
 542 #endif /* CONFIG_SERIAL_CORE_CONSOLE */
 543 #endif /* CONFIG_PPC_MULTIPLATFORM */
 544
 545 struct bi_record *find_bootinfo(void)
 546 {
 547         struct bi_record *rec;
 548
 549         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 550         if ( rec->tag != BI_FIRST ) {
 551                 /*
 552                  * This 0x10000 offset is a terrible hack but it will go away when
 553                  * we have the bootloader handle all the relocation and
 554                  * prom calls -- Cort
 555                  */
 556                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 557                 if ( rec->tag != BI_FIRST )
 558                         return NULL;
 559         }
 560         return rec;
 561 }
 562
 563 void parse_bootinfo(struct bi_record *rec)
 564 {
 565         if (rec == NULL || rec->tag != BI_FIRST)
 566                 return;
 567         while (rec->tag != BI_LAST) {
 568                 ulong *data = rec->data;
 569                 switch (rec->tag) {
 570                 case BI_CMD_LINE:
 571                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 572                         break;
 573 #ifdef CONFIG_BLK_DEV_INITRD
 574                 case BI_INITRD:
 575                         initrd_start = data[0] + KERNELBASE;
 576                         initrd_end = data[0] + data[1] + KERNELBASE;
 577                         break;
 578 #endif /* CONFIG_BLK_DEV_INITRD */
 579 #ifdef CONFIG_PPC_MULTIPLATFORM
 580                 case BI_MACHTYPE:
 581                         _machine = data[0];
 582                         break;
 583 #endif
 584                 case BI_MEMSIZE:
 585                         boot_mem_size = data[0];
 586                         break;
 587                 }
 588                 rec = (struct bi_record *)((ulong)rec + rec->size);
 589         }
 590 }
 591
 592 /*
 593  * Find out what kind of machine we're on and save any data we need
 594  * from the early boot process (devtree is copied on pmac by prom_init()).
 595  * This is called very early on the boot process, after a minimal
 596  * MMU environment has been set up but before MMU_init is called.
 597  */
 598 void __init
 599 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 600              unsigned long r6, unsigned long r7)
 601 {
 602 #ifdef CONFIG_CMDLINE
 603         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 604 #endif /* CONFIG_CMDLINE */
 605
 606 #ifdef CONFIG_6xx
 607         ppc_md.power_save = ppc6xx_idle;
 608 #endif
 609 #ifdef CONFIG_POWER4
 610         ppc_md.power_save = power4_idle;
 611 #endif
 612
 613         platform_init(r3, r4, r5, r6, r7);
 614
 615         if (ppc_md.progress)
 616                 ppc_md.progress("id mach(): done", 0x200);
 617 }
 618 #ifdef CONFIG_BOOKE_WDT
 619 /* Checks wdt=x and wdt_period=xx command-line option */
 620 int __init early_parse_wdt(char *p)
 621 {
 622         extern u32 wdt_enable;
 623
 624         if (p && strncmp(p, "0", 1) != 0)
 625                wdt_enable = 1;
 626
 627         return 0;
 628 }
 629 early_param("wdt", early_parse_wdt);
 630
 631 int __init early_parse_wdt_period (char *p)
 632 {
 633         extern u32 wdt_period;
 634
 635         if (p)
 636                 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 }