linux/arch/powerpc/platforms/powermac/bootx_init.c
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   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/kernel.h>
  13#include <linux/string.h>
  14#include <linux/init.h>
  15#include <generated/utsrelease.h>
  16#include <asm/sections.h>
  17#include <asm/prom.h>
  18#include <asm/page.h>
  19#include <asm/bootx.h>
  20#include <asm/btext.h>
  21#include <asm/io.h>
  22
  23#undef DEBUG
  24#define SET_BOOT_BAT
  25
  26#ifdef DEBUG
  27#define DBG(fmt...) do { bootx_printf(fmt); } while(0)
  28#else
  29#define DBG(fmt...) do { } while(0)
  30#endif
  31
  32extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
  33
  34static unsigned long __initdata bootx_dt_strbase;
  35static unsigned long __initdata bootx_dt_strend;
  36static unsigned long __initdata bootx_node_chosen;
  37static boot_infos_t * __initdata bootx_info;
  38static char __initdata bootx_disp_path[256];
  39
  40/* Is boot-info compatible ? */
  41#define BOOT_INFO_IS_COMPATIBLE(bi) \
  42        ((bi)->compatible_version <= BOOT_INFO_VERSION)
  43#define BOOT_INFO_IS_V2_COMPATIBLE(bi)  ((bi)->version >= 2)
  44#define BOOT_INFO_IS_V4_COMPATIBLE(bi)  ((bi)->version >= 4)
  45
  46#ifdef CONFIG_BOOTX_TEXT
  47static void __init bootx_printf(const char *format, ...)
  48{
  49        const char *p, *q, *s;
  50        va_list args;
  51        unsigned long v;
  52
  53        va_start(args, format);
  54        for (p = format; *p != 0; p = q) {
  55                for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
  56                        ;
  57                if (q > p)
  58                        btext_drawtext(p, q - p);
  59                if (*q == 0)
  60                        break;
  61                if (*q == '\n') {
  62                        ++q;
  63                        btext_flushline();
  64                        btext_drawstring("\r\n");
  65                        btext_flushline();
  66                        continue;
  67                }
  68                ++q;
  69                if (*q == 0)
  70                        break;
  71                switch (*q) {
  72                case 's':
  73                        ++q;
  74                        s = va_arg(args, const char *);
  75                        if (s == NULL)
  76                                s = "<NULL>";
  77                        btext_drawstring(s);
  78                        break;
  79                case 'x':
  80                        ++q;
  81                        v = va_arg(args, unsigned long);
  82                        btext_drawhex(v);
  83                        break;
  84                }
  85        }
  86}
  87#else /* CONFIG_BOOTX_TEXT */
  88static void __init bootx_printf(const char *format, ...) {}
  89#endif /* CONFIG_BOOTX_TEXT */
  90
  91static void * __init bootx_early_getprop(unsigned long base,
  92                                         unsigned long node,
  93                                         char *prop)
  94{
  95        struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
  96        u32 *ppp = &np->properties;
  97
  98        while(*ppp) {
  99                struct bootx_dt_prop *pp =
 100                        (struct bootx_dt_prop *)(base + *ppp);
 101
 102                if (strcmp((char *)((unsigned long)pp->name + base),
 103                           prop) == 0) {
 104                        return (void *)((unsigned long)pp->value + base);
 105                }
 106                ppp = &pp->next;
 107        }
 108        return NULL;
 109}
 110
 111#define dt_push_token(token, mem) \
 112        do { \
 113                *(mem) = _ALIGN_UP(*(mem),4); \
 114                *((u32 *)*(mem)) = token; \
 115                *(mem) += 4; \
 116        } while(0)
 117
 118static unsigned long __init bootx_dt_find_string(char *str)
 119{
 120        char *s, *os;
 121
 122        s = os = (char *)bootx_dt_strbase;
 123        s += 4;
 124        while (s <  (char *)bootx_dt_strend) {
 125                if (strcmp(s, str) == 0)
 126                        return s - os;
 127                s += strlen(s) + 1;
 128        }
 129        return 0;
 130}
 131
 132static void __init bootx_dt_add_prop(char *name, void *data, int size,
 133                                  unsigned long *mem_end)
 134{
 135        unsigned long soff = bootx_dt_find_string(name);
 136        if (data == NULL)
 137                size = 0;
 138        if (soff == 0) {
 139                bootx_printf("WARNING: Can't find string index for <%s>\n",
 140                             name);
 141                return;
 142        }
 143        if (size > 0x20000) {
 144                bootx_printf("WARNING: ignoring large property ");
 145                bootx_printf("%s length 0x%x\n", name, size);
 146                return;
 147        }
 148        dt_push_token(OF_DT_PROP, mem_end);
 149        dt_push_token(size, mem_end);
 150        dt_push_token(soff, mem_end);
 151
 152        /* push property content */
 153        if (size && data) {
 154                memcpy((void *)*mem_end, data, size);
 155                *mem_end = _ALIGN_UP(*mem_end + size, 4);
 156        }
 157}
 158
 159static void __init bootx_add_chosen_props(unsigned long base,
 160                                          unsigned long *mem_end)
 161{
 162        u32 val;
 163
 164        bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end);
 165
 166        if (bootx_info->kernelParamsOffset) {
 167                char *args = (char *)((unsigned long)bootx_info) +
 168                        bootx_info->kernelParamsOffset;
 169                bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
 170        }
 171        if (bootx_info->ramDisk) {
 172                val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
 173                bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
 174                val += bootx_info->ramDiskSize;
 175                bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
 176        }
 177        if (strlen(bootx_disp_path))
 178                bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
 179                                  strlen(bootx_disp_path) + 1, mem_end);
 180}
 181
 182static void __init bootx_add_display_props(unsigned long base,
 183                                           unsigned long *mem_end,
 184                                           int has_real_node)
 185{
 186        boot_infos_t *bi = bootx_info;
 187        u32 tmp;
 188
 189        if (has_real_node) {
 190                bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
 191                bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
 192        } else
 193                bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end);
 194
 195        tmp = bi->dispDeviceDepth;
 196        bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end);
 197        tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0];
 198        bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end);
 199        tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1];
 200        bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end);
 201        tmp = bi->dispDeviceRowBytes;
 202        bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end);
 203        tmp = (u32)bi->dispDeviceBase;
 204        if (tmp == 0)
 205                tmp = (u32)bi->logicalDisplayBase;
 206        tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
 207        tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
 208        bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end);
 209}
 210
 211static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
 212{
 213        unsigned int l = strlen(s) + 1;
 214        memcpy((void *)*mem_end, s, l);
 215        bootx_dt_strend = *mem_end = *mem_end + l;
 216}
 217
 218static void __init bootx_scan_dt_build_strings(unsigned long base,
 219                                               unsigned long node,
 220                                               unsigned long *mem_end)
 221{
 222        struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 223        u32 *cpp, *ppp = &np->properties;
 224        unsigned long soff;
 225        char *namep;
 226
 227        /* Keep refs to known nodes */
 228        namep = np->full_name ? (char *)(base + np->full_name) : NULL;
 229        if (namep == NULL) {
 230                bootx_printf("Node without a full name !\n");
 231                namep = "";
 232        }
 233        DBG("* strings: %s\n", namep);
 234
 235        if (!strcmp(namep, "/chosen")) {
 236                DBG(" detected /chosen ! adding properties names !\n");
 237                bootx_dt_add_string("linux,bootx", mem_end);
 238                bootx_dt_add_string("linux,stdout-path", mem_end);
 239                bootx_dt_add_string("linux,initrd-start", mem_end);
 240                bootx_dt_add_string("linux,initrd-end", mem_end);
 241                bootx_dt_add_string("bootargs", mem_end);
 242                bootx_node_chosen = node;
 243        }
 244        if (node == bootx_info->dispDeviceRegEntryOffset) {
 245                DBG(" detected display ! adding properties names !\n");
 246                bootx_dt_add_string("linux,boot-display", mem_end);
 247                bootx_dt_add_string("linux,opened", mem_end);
 248                strncpy(bootx_disp_path, namep, 255);
 249        }
 250
 251        /* get and store all property names */
 252        while (*ppp) {
 253                struct bootx_dt_prop *pp =
 254                        (struct bootx_dt_prop *)(base + *ppp);
 255
 256                namep = pp->name ? (char *)(base + pp->name) : NULL;
 257                if (namep == NULL || strcmp(namep, "name") == 0)
 258                        goto next;
 259                /* get/create string entry */
 260                soff = bootx_dt_find_string(namep);
 261                if (soff == 0)
 262                        bootx_dt_add_string(namep, mem_end);
 263        next:
 264                ppp = &pp->next;
 265        }
 266
 267        /* do all our children */
 268        cpp = &np->child;
 269        while(*cpp) {
 270                np = (struct bootx_dt_node *)(base + *cpp);
 271                bootx_scan_dt_build_strings(base, *cpp, mem_end);
 272                cpp = &np->sibling;
 273        }
 274}
 275
 276static void __init bootx_scan_dt_build_struct(unsigned long base,
 277                                              unsigned long node,
 278                                              unsigned long *mem_end)
 279{
 280        struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 281        u32 *cpp, *ppp = &np->properties;
 282        char *namep, *p, *ep, *lp;
 283        int l;
 284
 285        dt_push_token(OF_DT_BEGIN_NODE, mem_end);
 286
 287        /* get the node's full name */
 288        namep = np->full_name ? (char *)(base + np->full_name) : NULL;
 289        if (namep == NULL)
 290                namep = "";
 291        l = strlen(namep);
 292
 293        DBG("* struct: %s\n", namep);
 294
 295        /* Fixup an Apple bug where they have bogus \0 chars in the
 296         * middle of the path in some properties, and extract
 297         * the unit name (everything after the last '/').
 298         */
 299        memcpy((void *)*mem_end, namep, l + 1);
 300        namep = (char *)*mem_end;
 301        for (lp = p = namep, ep = namep + l; p < ep; p++) {
 302                if (*p == '/')
 303                        lp = namep;
 304                else if (*p != 0)
 305                        *lp++ = *p;
 306        }
 307        *lp = 0;
 308        *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
 309
 310        /* get and store all properties */
 311        while (*ppp) {
 312                struct bootx_dt_prop *pp =
 313                        (struct bootx_dt_prop *)(base + *ppp);
 314
 315                namep = pp->name ? (char *)(base + pp->name) : NULL;
 316                /* Skip "name" */
 317                if (namep == NULL || !strcmp(namep, "name"))
 318                        goto next;
 319                /* Skip "bootargs" in /chosen too as we replace it */
 320                if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
 321                        goto next;
 322
 323                /* push property head */
 324                bootx_dt_add_prop(namep,
 325                                  pp->value ? (void *)(base + pp->value): NULL,
 326                                  pp->length, mem_end);
 327        next:
 328                ppp = &pp->next;
 329        }
 330
 331        if (node == bootx_node_chosen) {
 332                bootx_add_chosen_props(base, mem_end);
 333                if (bootx_info->dispDeviceRegEntryOffset == 0)
 334                        bootx_add_display_props(base, mem_end, 0);
 335        }
 336        else if (node == bootx_info->dispDeviceRegEntryOffset)
 337                bootx_add_display_props(base, mem_end, 1);
 338
 339        /* do all our children */
 340        cpp = &np->child;
 341        while(*cpp) {
 342                np = (struct bootx_dt_node *)(base + *cpp);
 343                bootx_scan_dt_build_struct(base, *cpp, mem_end);
 344                cpp = &np->sibling;
 345        }
 346
 347        dt_push_token(OF_DT_END_NODE, mem_end);
 348}
 349
 350static unsigned long __init bootx_flatten_dt(unsigned long start)
 351{
 352        boot_infos_t *bi = bootx_info;
 353        unsigned long mem_start, mem_end;
 354        struct boot_param_header *hdr;
 355        unsigned long base;
 356        u64 *rsvmap;
 357
 358        /* Start using memory after the big blob passed by BootX, get
 359         * some space for the header
 360         */
 361        mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
 362        DBG("Boot params header at: %x\n", mem_start);
 363        hdr = (struct boot_param_header *)mem_start;
 364        mem_end += sizeof(struct boot_param_header);
 365        rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
 366        hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
 367        mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
 368
 369        /* Get base of tree */
 370        base = ((unsigned long)bi) + bi->deviceTreeOffset;
 371
 372        /* Build string array */
 373        DBG("Building string array at: %x\n", mem_end);
 374        DBG("Device Tree Base=%x\n", base);
 375        bootx_dt_strbase = mem_end;
 376        mem_end += 4;
 377        bootx_dt_strend = mem_end;
 378        bootx_scan_dt_build_strings(base, 4, &mem_end);
 379        /* Add some strings */
 380        bootx_dt_add_string("linux,bootx-noscreen", &mem_end);
 381        bootx_dt_add_string("linux,bootx-depth", &mem_end);
 382        bootx_dt_add_string("linux,bootx-width", &mem_end);
 383        bootx_dt_add_string("linux,bootx-height", &mem_end);
 384        bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
 385        bootx_dt_add_string("linux,bootx-addr", &mem_end);
 386        /* Wrap up strings */
 387        hdr->off_dt_strings = bootx_dt_strbase - mem_start;
 388        hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
 389
 390        /* Build structure */
 391        mem_end = _ALIGN(mem_end, 16);
 392        DBG("Building device tree structure at: %x\n", mem_end);
 393        hdr->off_dt_struct = mem_end - mem_start;
 394        bootx_scan_dt_build_struct(base, 4, &mem_end);
 395        dt_push_token(OF_DT_END, &mem_end);
 396
 397        /* Finish header */
 398        hdr->boot_cpuid_phys = 0;
 399        hdr->magic = OF_DT_HEADER;
 400        hdr->totalsize = mem_end - mem_start;
 401        hdr->version = OF_DT_VERSION;
 402        /* Version 16 is not backward compatible */
 403        hdr->last_comp_version = 0x10;
 404
 405        /* Reserve the whole thing and copy the reserve map in, we
 406         * also bump mem_reserve_cnt to cause further reservations to
 407         * fail since it's too late.
 408         */
 409        mem_end = _ALIGN(mem_end, PAGE_SIZE);
 410        DBG("End of boot params: %x\n", mem_end);
 411        rsvmap[0] = mem_start;
 412        rsvmap[1] = mem_end;
 413        if (bootx_info->ramDisk) {
 414                rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk;
 415                rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize;
 416                rsvmap[4] = 0;
 417                rsvmap[5] = 0;
 418        } else {
 419                rsvmap[2] = 0;
 420                rsvmap[3] = 0;
 421        }
 422
 423        return (unsigned long)hdr;
 424}
 425
 426
 427#ifdef CONFIG_BOOTX_TEXT
 428static void __init btext_welcome(boot_infos_t *bi)
 429{
 430        unsigned long flags;
 431        unsigned long pvr;
 432
 433        bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
 434        bootx_printf("\nlinked at        : 0x%x", KERNELBASE);
 435        bootx_printf("\nframe buffer at  : 0x%x", bi->dispDeviceBase);
 436        bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
 437        bootx_printf(" (log)");
 438        bootx_printf("\nklimit           : 0x%x",(unsigned long)klimit);
 439        bootx_printf("\nboot_info at     : 0x%x", bi);
 440        __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
 441        bootx_printf("\nMSR              : 0x%x", flags);
 442        __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
 443        bootx_printf("\nPVR              : 0x%x", pvr);
 444        pvr >>= 16;
 445        if (pvr > 1) {
 446            __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
 447            bootx_printf("\nHID0             : 0x%x", flags);
 448        }
 449        if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
 450            __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
 451            bootx_printf("\nICTC             : 0x%x", flags);
 452        }
 453#ifdef DEBUG
 454        bootx_printf("\n\n");
 455        bootx_printf("bi->deviceTreeOffset   : 0x%x\n",
 456                     bi->deviceTreeOffset);
 457        bootx_printf("bi->deviceTreeSize     : 0x%x\n",
 458                     bi->deviceTreeSize);
 459#endif
 460        bootx_printf("\n\n");
 461}
 462#endif /* CONFIG_BOOTX_TEXT */
 463
 464void __init bootx_init(unsigned long r3, unsigned long r4)
 465{
 466        boot_infos_t *bi = (boot_infos_t *) r4;
 467        unsigned long hdr;
 468        unsigned long space;
 469        unsigned long ptr, x;
 470        char *model;
 471        unsigned long offset = reloc_offset();
 472
 473        reloc_got2(offset);
 474
 475        bootx_info = bi;
 476
 477        /* We haven't cleared any bss at this point, make sure
 478         * what we need is initialized
 479         */
 480        bootx_dt_strbase = bootx_dt_strend = 0;
 481        bootx_node_chosen = 0;
 482        bootx_disp_path[0] = 0;
 483
 484        if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
 485                bi->logicalDisplayBase = bi->dispDeviceBase;
 486
 487        /* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
 488        if (bi->dispDeviceDepth == 16)
 489                bi->dispDeviceDepth = 15;
 490
 491
 492#ifdef CONFIG_BOOTX_TEXT
 493        ptr = (unsigned long)bi->logicalDisplayBase;
 494        ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
 495        ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
 496        btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
 497                            bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
 498                            bi->dispDeviceDepth, bi->dispDeviceRowBytes,
 499                            (unsigned long)bi->logicalDisplayBase);
 500        btext_clearscreen();
 501        btext_flushscreen();
 502#endif /* CONFIG_BOOTX_TEXT */
 503
 504        /*
 505         * Test if boot-info is compatible.  Done only in config
 506         * CONFIG_BOOTX_TEXT since there is nothing much we can do
 507         * with an incompatible version, except display a message
 508         * and eventually hang the processor...
 509         *
 510         * I'll try to keep enough of boot-info compatible in the
 511         * future to always allow display of this message;
 512         */
 513        if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
 514                bootx_printf(" !!! WARNING - Incompatible version"
 515                             " of BootX !!!\n\n\n");
 516                for (;;)
 517                        ;
 518        }
 519        if (bi->architecture != BOOT_ARCH_PCI) {
 520                bootx_printf(" !!! WARNING - Usupported machine"
 521                             " architecture !\n");
 522                for (;;)
 523                        ;
 524        }
 525
 526#ifdef CONFIG_BOOTX_TEXT
 527        btext_welcome(bi);
 528#endif
 529
 530        /* New BootX enters kernel with MMU off, i/os are not allowed
 531         * here. This hack will have been done by the boostrap anyway.
 532         */
 533        if (bi->version < 4) {
 534                /*
 535                 * XXX If this is an iMac, turn off the USB controller.
 536                 */
 537                model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
 538                                                     4, "model");
 539                if (model
 540                    && (strcmp(model, "iMac,1") == 0
 541                        || strcmp(model, "PowerMac1,1") == 0)) {
 542                        bootx_printf("iMac,1 detected, shutting down USB\n");
 543                        out_le32((unsigned __iomem *)0x80880008, 1);    /* XXX */
 544                }
 545        }
 546
 547        /* Get a pointer that points above the device tree, args, ramdisk,
 548         * etc... to use for generating the flattened tree
 549         */
 550        if (bi->version < 5) {
 551                space = bi->deviceTreeOffset + bi->deviceTreeSize;
 552                if (bi->ramDisk >= space)
 553                        space = bi->ramDisk + bi->ramDiskSize;
 554        } else
 555                space = bi->totalParamsSize;
 556
 557        bootx_printf("Total space used by parameters & ramdisk: 0x%x\n", space);
 558
 559        /* New BootX will have flushed all TLBs and enters kernel with
 560         * MMU switched OFF, so this should not be useful anymore.
 561         */
 562        if (bi->version < 4) {
 563                bootx_printf("Touching pages...\n");
 564
 565                /*
 566                 * Touch each page to make sure the PTEs for them
 567                 * are in the hash table - the aim is to try to avoid
 568                 * getting DSI exceptions while copying the kernel image.
 569                 */
 570                for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
 571                     ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
 572                        x = *(volatile unsigned long *)ptr;
 573        }
 574
 575        /* Ok, now we need to generate a flattened device-tree to pass
 576         * to the kernel
 577         */
 578        bootx_printf("Preparing boot params...\n");
 579
 580        hdr = bootx_flatten_dt(space);
 581
 582#ifdef CONFIG_BOOTX_TEXT
 583#ifdef SET_BOOT_BAT
 584        bootx_printf("Preparing BAT...\n");
 585        btext_prepare_BAT();
 586#else
 587        btext_unmap();
 588#endif
 589#endif
 590
 591        reloc_got2(-offset);
 592
 593        __start(hdr, KERNELBASE + offset, 0);
 594}
 595