arch/powerpc/platforms/powermac/bootx_init.c

   1 /*
   2  *  Early boot support code for BootX bootloader
   3  *
   4  *  Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version
   9  *  2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/kernel.h>
  14 #include <linux/string.h>
  15 #include <linux/init.h>
  16 #include <linux/version.h>
  17 #include <asm/sections.h>
  18 #include <asm/prom.h>
  19 #include <asm/page.h>
  20 #include <asm/bootx.h>
  21 #include <asm/bootinfo.h>
  22 #include <asm/btext.h>
  23 #include <asm/io.h>
  24
  25 #undef DEBUG
  26 #define SET_BOOT_BAT
  27
  28 #ifdef DEBUG
  29 #define DBG(fmt...) do { bootx_printf(fmt); } while(0)
  30 #else
  31 #define DBG(fmt...) do { } while(0)
  32 #endif
  33
  34 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
  35
  36 static unsigned long __initdata bootx_dt_strbase;
  37 static unsigned long __initdata bootx_dt_strend;
  38 static unsigned long __initdata bootx_node_chosen;
  39 static boot_infos_t * __initdata bootx_info;
  40 static char __initdata bootx_disp_path[256];
  41
  42 /* Is boot-info compatible ? */
  43 #define BOOT_INFO_IS_COMPATIBLE(bi) \
  44         ((bi)->compatible_version <= BOOT_INFO_VERSION)
  45 #define BOOT_INFO_IS_V2_COMPATIBLE(bi)  ((bi)->version >= 2)
  46 #define BOOT_INFO_IS_V4_COMPATIBLE(bi)  ((bi)->version >= 4)
  47
  48 #ifdef CONFIG_BOOTX_TEXT
  49 static void __init bootx_printf(const char *format, ...)
  50 {
  51         const char *p, *q, *s;
  52         va_list args;
  53         unsigned long v;
  54
  55         va_start(args, format);
  56         for (p = format; *p != 0; p = q) {
  57                 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
  58                         ;
  59                 if (q > p)
  60                         btext_drawtext(p, q - p);
  61                 if (*q == 0)
  62                         break;
  63                 if (*q == '\n') {
  64                         ++q;
  65                         btext_flushline();
  66                         btext_drawstring("\r\n");
  67                         btext_flushline();
  68                         continue;
  69                 }
  70                 ++q;
  71                 if (*q == 0)
  72                         break;
  73                 switch (*q) {
  74                 case 's':
  75                         ++q;
  76                         s = va_arg(args, const char *);
  77                         if (s == NULL)
  78                                 s = "<NULL>";
  79                         btext_drawstring(s);
  80                         break;
  81                 case 'x':
  82                         ++q;
  83                         v = va_arg(args, unsigned long);
  84                         btext_drawhex(v);
  85                         break;
  86                 }
  87         }
  88 }
  89 #else /* CONFIG_BOOTX_TEXT */
  90 static void __init bootx_printf(const char *format, ...) {}
  91 #endif /* CONFIG_BOOTX_TEXT */
  92
  93 static void * __init bootx_early_getprop(unsigned long base,
  94                                          unsigned long node,
  95                                          char *prop)
  96 {
  97         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
  98         u32 *ppp = &np->properties;
  99
 100         while(*ppp) {
 101                 struct bootx_dt_prop *pp =
 102                         (struct bootx_dt_prop *)(base + *ppp);
 103
 104                 if (strcmp((char *)((unsigned long)pp->name + base),
 105                            prop) == 0) {
 106                         return (void *)((unsigned long)pp->value + base);
 107                 }
 108                 ppp = &pp->next;
 109         }
 110         return NULL;
 111 }
 112
 113 #define dt_push_token(token, mem) \
 114         do { \
 115                 *(mem) = _ALIGN_UP(*(mem),4); \
 116                 *((u32 *)*(mem)) = token; \
 117                 *(mem) += 4; \
 118         } while(0)
 119
 120 static unsigned long __init bootx_dt_find_string(char *str)
 121 {
 122         char *s, *os;
 123
 124         s = os = (char *)bootx_dt_strbase;
 125         s += 4;
 126         while (s <  (char *)bootx_dt_strend) {
 127                 if (strcmp(s, str) == 0)
 128                         return s - os;
 129                 s += strlen(s) + 1;
 130         }
 131         return 0;
 132 }
 133
 134 static void __init bootx_dt_add_prop(char *name, void *data, int size,
 135                                   unsigned long *mem_end)
 136 {
 137         unsigned long soff = bootx_dt_find_string(name);
 138         if (data == NULL)
 139                 size = 0;
 140         if (soff == 0) {
 141                 bootx_printf("WARNING: Can't find string index for <%s>\n",
 142                              name);
 143                 return;
 144         }
 145         if (size > 0x20000) {
 146                 bootx_printf("WARNING: ignoring large property ");
 147                 bootx_printf("%s length 0x%x\n", name, size);
 148                 return;
 149         }
 150         dt_push_token(OF_DT_PROP, mem_end);
 151         dt_push_token(size, mem_end);
 152         dt_push_token(soff, mem_end);
 153
 154         /* push property content */
 155         if (size && data) {
 156                 memcpy((void *)*mem_end, data, size);
 157                 *mem_end = _ALIGN_UP(*mem_end + size, 4);
 158         }
 159 }
 160
 161 static void __init bootx_add_chosen_props(unsigned long base,
 162                                           unsigned long *mem_end)
 163 {
 164         u32 val = _MACH_Pmac;
 165
 166         bootx_dt_add_prop("linux,platform", &val, 4, mem_end);
 167
 168         if (bootx_info->kernelParamsOffset) {
 169                 char *args = (char *)((unsigned long)bootx_info) +
 170                         bootx_info->kernelParamsOffset;
 171                 bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
 172         }
 173         if (bootx_info->ramDisk) {
 174                 val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
 175                 bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
 176                 val += bootx_info->ramDiskSize;
 177                 bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
 178         }
 179         if (strlen(bootx_disp_path))
 180                 bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
 181                                   strlen(bootx_disp_path) + 1, mem_end);
 182 }
 183
 184 static void __init bootx_add_display_props(unsigned long base,
 185                                            unsigned long *mem_end)
 186 {
 187         bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
 188         bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
 189 }
 190
 191 static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
 192 {
 193         unsigned int l = strlen(s) + 1;
 194         memcpy((void *)*mem_end, s, l);
 195         bootx_dt_strend = *mem_end = *mem_end + l;
 196 }
 197
 198 static void __init bootx_scan_dt_build_strings(unsigned long base,
 199                                                unsigned long node,
 200                                                unsigned long *mem_end)
 201 {
 202         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 203         u32 *cpp, *ppp = &np->properties;
 204         unsigned long soff;
 205         char *namep;
 206
 207         /* Keep refs to known nodes */
 208         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
 209         if (namep == NULL) {
 210                 bootx_printf("Node without a full name !\n");
 211                 namep = "";
 212         }
 213         DBG("* strings: %s\n", namep);
 214
 215         if (!strcmp(namep, "/chosen")) {
 216                 DBG(" detected /chosen ! adding properties names !\n");
 217                 bootx_dt_add_string("linux,platform", mem_end);
 218                 bootx_dt_add_string("linux,stdout-path", mem_end);
 219                 bootx_dt_add_string("linux,initrd-start", mem_end);
 220                 bootx_dt_add_string("linux,initrd-end", mem_end);
 221                 bootx_dt_add_string("bootargs", mem_end);
 222                 bootx_node_chosen = node;
 223         }
 224         if (node == bootx_info->dispDeviceRegEntryOffset) {
 225                 DBG(" detected display ! adding properties names !\n");
 226                 bootx_dt_add_string("linux,boot-display", mem_end);
 227                 bootx_dt_add_string("linux,opened", mem_end);
 228                 strncpy(bootx_disp_path, namep, 255);
 229         }
 230
 231         /* get and store all property names */
 232         while (*ppp) {
 233                 struct bootx_dt_prop *pp =
 234                         (struct bootx_dt_prop *)(base + *ppp);
 235
 236                 namep = pp->name ? (char *)(base + pp->name) : NULL;
 237                 if (namep == NULL || strcmp(namep, "name") == 0)
 238                         goto next;
 239                 /* get/create string entry */
 240                 soff = bootx_dt_find_string(namep);
 241                 if (soff == 0)
 242                         bootx_dt_add_string(namep, mem_end);
 243         next:
 244                 ppp = &pp->next;
 245         }
 246
 247         /* do all our children */
 248         cpp = &np->child;
 249         while(*cpp) {
 250                 np = (struct bootx_dt_node *)(base + *cpp);
 251                 bootx_scan_dt_build_strings(base, *cpp, mem_end);
 252                 cpp = &np->sibling;
 253         }
 254 }
 255
 256 static void __init bootx_scan_dt_build_struct(unsigned long base,
 257                                               unsigned long node,
 258                                               unsigned long *mem_end)
 259 {
 260         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 261         u32 *cpp, *ppp = &np->properties;
 262         char *namep, *p, *ep, *lp;
 263         int l;
 264
 265         dt_push_token(OF_DT_BEGIN_NODE, mem_end);
 266
 267         /* get the node's full name */
 268         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
 269         if (namep == NULL)
 270                 namep = "";
 271         l = strlen(namep);
 272
 273         DBG("* struct: %s\n", namep);
 274
 275         /* Fixup an Apple bug where they have bogus \0 chars in the
 276          * middle of the path in some properties, and extract
 277          * the unit name (everything after the last '/').
 278          */
 279         memcpy((void *)*mem_end, namep, l + 1);
 280         namep = (char *)*mem_end;
 281         for (lp = p = namep, ep = namep + l; p < ep; p++) {
 282                 if (*p == '/')
 283                         lp = namep;
 284                 else if (*p != 0)
 285                         *lp++ = *p;
 286         }
 287         *lp = 0;
 288         *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
 289
 290         /* get and store all properties */
 291         while (*ppp) {
 292                 struct bootx_dt_prop *pp =
 293                         (struct bootx_dt_prop *)(base + *ppp);
 294
 295                 namep = pp->name ? (char *)(base + pp->name) : NULL;
 296                 /* Skip "name" */
 297                 if (namep == NULL || !strcmp(namep, "name"))
 298                         goto next;
 299                 /* Skip "bootargs" in /chosen too as we replace it */
 300                 if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
 301                         goto next;
 302
 303                 /* push property head */
 304                 bootx_dt_add_prop(namep,
 305                                   pp->value ? (void *)(base + pp->value): NULL,
 306                                   pp->length, mem_end);
 307         next:
 308                 ppp = &pp->next;
 309         }
 310
 311         if (node == bootx_node_chosen)
 312                 bootx_add_chosen_props(base, mem_end);
 313         if (node == bootx_info->dispDeviceRegEntryOffset)
 314                 bootx_add_display_props(base, mem_end);
 315
 316         /* do all our children */
 317         cpp = &np->child;
 318         while(*cpp) {
 319                 np = (struct bootx_dt_node *)(base + *cpp);
 320                 bootx_scan_dt_build_struct(base, *cpp, mem_end);
 321                 cpp = &np->sibling;
 322         }
 323
 324         dt_push_token(OF_DT_END_NODE, mem_end);
 325 }
 326
 327 static unsigned long __init bootx_flatten_dt(unsigned long start)
 328 {
 329         boot_infos_t *bi = bootx_info;
 330         unsigned long mem_start, mem_end;
 331         struct boot_param_header *hdr;
 332         unsigned long base;
 333         u64 *rsvmap;
 334
 335         /* Start using memory after the big blob passed by BootX, get
 336          * some space for the header
 337          */
 338         mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
 339         DBG("Boot params header at: %x\n", mem_start);
 340         hdr = (struct boot_param_header *)mem_start;
 341         mem_end += sizeof(struct boot_param_header);
 342         rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
 343         hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
 344         mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
 345
 346         /* Get base of tree */
 347         base = ((unsigned long)bi) + bi->deviceTreeOffset;
 348
 349         /* Build string array */
 350         DBG("Building string array at: %x\n", mem_end);
 351         DBG("Device Tree Base=%x\n", base);
 352         bootx_dt_strbase = mem_end;
 353         mem_end += 4;
 354         bootx_dt_strend = mem_end;
 355         bootx_scan_dt_build_strings(base, 4, &mem_end);
 356         hdr->off_dt_strings = bootx_dt_strbase - mem_start;
 357         hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
 358
 359         /* Build structure */
 360         mem_end = _ALIGN(mem_end, 16);
 361         DBG("Building device tree structure at: %x\n", mem_end);
 362         hdr->off_dt_struct = mem_end - mem_start;
 363         bootx_scan_dt_build_struct(base, 4, &mem_end);
 364         dt_push_token(OF_DT_END, &mem_end);
 365
 366         /* Finish header */
 367         hdr->boot_cpuid_phys = 0;
 368         hdr->magic = OF_DT_HEADER;
 369         hdr->totalsize = mem_end - mem_start;
 370         hdr->version = OF_DT_VERSION;
 371         /* Version 16 is not backward compatible */
 372         hdr->last_comp_version = 0x10;
 373
 374         /* Reserve the whole thing and copy the reserve map in, we
 375          * also bump mem_reserve_cnt to cause further reservations to
 376          * fail since it's too late.
 377          */
 378         mem_end = _ALIGN(mem_end, PAGE_SIZE);
 379         DBG("End of boot params: %x\n", mem_end);
 380         rsvmap[0] = mem_start;
 381         rsvmap[1] = mem_end;
 382         rsvmap[2] = 0;
 383         rsvmap[3] = 0;
 384
 385         return (unsigned long)hdr;
 386 }
 387
 388
 389 #ifdef CONFIG_BOOTX_TEXT
 390 static void __init btext_welcome(boot_infos_t *bi)
 391 {
 392         unsigned long flags;
 393         unsigned long pvr;
 394
 395         bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
 396         bootx_printf("\nlinked at        : 0x%x", KERNELBASE);
 397         bootx_printf("\nframe buffer at  : 0x%x", bi->dispDeviceBase);
 398         bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
 399         bootx_printf(" (log)");
 400         bootx_printf("\nklimit           : 0x%x",(unsigned long)klimit);
 401         bootx_printf("\nboot_info at     : 0x%x", bi);
 402         __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
 403         bootx_printf("\nMSR              : 0x%x", flags);
 404         __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
 405         bootx_printf("\nPVR              : 0x%x", pvr);
 406         pvr >>= 16;
 407         if (pvr > 1) {
 408             __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
 409             bootx_printf("\nHID0             : 0x%x", flags);
 410         }
 411         if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
 412             __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
 413             bootx_printf("\nICTC             : 0x%x", flags);
 414         }
 415 #ifdef DEBUG
 416         bootx_printf("\n\n");
 417         bootx_printf("bi->deviceTreeOffset   : 0x%x\n",
 418                      bi->deviceTreeOffset);
 419         bootx_printf("bi->deviceTreeSize     : 0x%x\n",
 420                      bi->deviceTreeSize);
 421 #endif
 422         bootx_printf("\n\n");
 423 }
 424 #endif /* CONFIG_BOOTX_TEXT */
 425
 426 void __init bootx_init(unsigned long r3, unsigned long r4)
 427 {
 428         boot_infos_t *bi = (boot_infos_t *) r4;
 429         unsigned long hdr;
 430         unsigned long space;
 431         unsigned long ptr, x;
 432         char *model;
 433         unsigned long offset = reloc_offset();
 434
 435         reloc_got2(offset);
 436
 437         bootx_info = bi;
 438
 439         /* We haven't cleared any bss at this point, make sure
 440          * what we need is initialized
 441          */
 442         bootx_dt_strbase = bootx_dt_strend = 0;
 443         bootx_node_chosen = 0;
 444         bootx_disp_path[0] = 0;
 445
 446         if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
 447                 bi->logicalDisplayBase = bi->dispDeviceBase;
 448
 449 #ifdef CONFIG_BOOTX_TEXT
 450         btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
 451                             bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
 452                             bi->dispDeviceDepth, bi->dispDeviceRowBytes,
 453                             (unsigned long)bi->logicalDisplayBase);
 454         btext_clearscreen();
 455         btext_flushscreen();
 456 #endif /* CONFIG_BOOTX_TEXT */
 457
 458         /*
 459          * Test if boot-info is compatible.  Done only in config
 460          * CONFIG_BOOTX_TEXT since there is nothing much we can do
 461          * with an incompatible version, except display a message
 462          * and eventually hang the processor...
 463          *
 464          * I'll try to keep enough of boot-info compatible in the
 465          * future to always allow display of this message;
 466          */
 467         if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
 468                 bootx_printf(" !!! WARNING - Incompatible version"
 469                              " of BootX !!!\n\n\n");
 470                 for (;;)
 471                         ;
 472         }
 473         if (bi->architecture != BOOT_ARCH_PCI) {
 474                 bootx_printf(" !!! WARNING - Usupported machine"
 475                              " architecture !\n");
 476                 for (;;)
 477                         ;
 478         }
 479
 480 #ifdef CONFIG_BOOTX_TEXT
 481         btext_welcome(bi);
 482 #endif
 483         /* New BootX enters kernel with MMU off, i/os are not allowed
 484          * here. This hack will have been done by the boostrap anyway.
 485          */
 486         if (bi->version < 4) {
 487                 /*
 488                  * XXX If this is an iMac, turn off the USB controller.
 489                  */
 490                 model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
 491                                                      4, "model");
 492                 if (model
 493                     && (strcmp(model, "iMac,1") == 0
 494                         || strcmp(model, "PowerMac1,1") == 0)) {
 495                         bootx_printf("iMac,1 detected, shutting down USB \n");
 496                         out_le32((unsigned *)0x80880008, 1);    /* XXX */
 497                 }
 498         }
 499
 500         /* Get a pointer that points above the device tree, args, ramdisk,
 501          * etc... to use for generating the flattened tree
 502          */
 503         if (bi->version < 5) {
 504                 space = bi->deviceTreeOffset + bi->deviceTreeSize;
 505                 if (bi->ramDisk)
 506                         space = bi->ramDisk + bi->ramDiskSize;
 507         } else
 508                 space = bi->totalParamsSize;
 509
 510         bootx_printf("Total space used by parameters & ramdisk: %x \n", space);
 511
 512         /* New BootX will have flushed all TLBs and enters kernel with
 513          * MMU switched OFF, so this should not be useful anymore.
 514          */
 515         if (bi->version < 4) {
 516                 bootx_printf("Touching pages...\n");
 517
 518                 /*
 519                  * Touch each page to make sure the PTEs for them
 520                  * are in the hash table - the aim is to try to avoid
 521                  * getting DSI exceptions while copying the kernel image.
 522                  */
 523                 for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
 524                      ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
 525                         x = *(volatile unsigned long *)ptr;
 526         }
 527
 528         /* Ok, now we need to generate a flattened device-tree to pass
 529          * to the kernel
 530          */
 531         bootx_printf("Preparing boot params...\n");
 532
 533         hdr = bootx_flatten_dt(space);
 534
 535 #ifdef CONFIG_BOOTX_TEXT
 536 #ifdef SET_BOOT_BAT
 537         bootx_printf("Preparing BAT...\n");
 538         btext_prepare_BAT();
 539 #else
 540         btext_unmap();
 541 #endif
 542 #endif
 543
 544         reloc_got2(-offset);
 545
 546         __start(hdr, KERNELBASE + offset, 0);
 547 }