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/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 #include <asm/setup.h>
  23
  24 #undef DEBUG
  25 #define SET_BOOT_BAT
  26
  27 #ifdef DEBUG
  28 #define DBG(fmt...) do { bootx_printf(fmt); } while(0)
  29 #else
  30 #define DBG(fmt...) do { } while(0)
  31 #endif
  32
  33 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
  34
  35 static unsigned long __initdata bootx_dt_strbase;
  36 static unsigned long __initdata bootx_dt_strend;
  37 static unsigned long __initdata bootx_node_chosen;
  38 static boot_infos_t * __initdata bootx_info;
  39 static char __initdata bootx_disp_path[256];
  40
  41 /* Is boot-info compatible ? */
  42 #define BOOT_INFO_IS_COMPATIBLE(bi) \
  43         ((bi)->compatible_version <= BOOT_INFO_VERSION)
  44 #define BOOT_INFO_IS_V2_COMPATIBLE(bi)  ((bi)->version >= 2)
  45 #define BOOT_INFO_IS_V4_COMPATIBLE(bi)  ((bi)->version >= 4)
  46
  47 #ifdef CONFIG_BOOTX_TEXT
  48 static void __init bootx_printf(const char *format, ...)
  49 {
  50         const char *p, *q, *s;
  51         va_list args;
  52         unsigned long v;
  53
  54         va_start(args, format);
  55         for (p = format; *p != 0; p = q) {
  56                 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
  57                         ;
  58                 if (q > p)
  59                         btext_drawtext(p, q - p);
  60                 if (*q == 0)
  61                         break;
  62                 if (*q == '\n') {
  63                         ++q;
  64                         btext_flushline();
  65                         btext_drawstring("\r\n");
  66                         btext_flushline();
  67                         continue;
  68                 }
  69                 ++q;
  70                 if (*q == 0)
  71                         break;
  72                 switch (*q) {
  73                 case 's':
  74                         ++q;
  75                         s = va_arg(args, const char *);
  76                         if (s == NULL)
  77                                 s = "<NULL>";
  78                         btext_drawstring(s);
  79                         break;
  80                 case 'x':
  81                         ++q;
  82                         v = va_arg(args, unsigned long);
  83                         btext_drawhex(v);
  84                         break;
  85                 }
  86         }
  87         va_end(args);
  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;
 165
 166         bootx_dt_add_prop("linux,bootx", NULL, 0, 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                                            int has_real_node)
 187 {
 188         boot_infos_t *bi = bootx_info;
 189         u32 tmp;
 190
 191         if (has_real_node) {
 192                 bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
 193                 bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
 194         } else
 195                 bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end);
 196
 197         tmp = bi->dispDeviceDepth;
 198         bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end);
 199         tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0];
 200         bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end);
 201         tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1];
 202         bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end);
 203         tmp = bi->dispDeviceRowBytes;
 204         bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end);
 205         tmp = (u32)bi->dispDeviceBase;
 206         if (tmp == 0)
 207                 tmp = (u32)bi->logicalDisplayBase;
 208         tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
 209         tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
 210         bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end);
 211 }
 212
 213 static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
 214 {
 215         unsigned int l = strlen(s) + 1;
 216         memcpy((void *)*mem_end, s, l);
 217         bootx_dt_strend = *mem_end = *mem_end + l;
 218 }
 219
 220 static void __init bootx_scan_dt_build_strings(unsigned long base,
 221                                                unsigned long node,
 222                                                unsigned long *mem_end)
 223 {
 224         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 225         u32 *cpp, *ppp = &np->properties;
 226         unsigned long soff;
 227         char *namep;
 228
 229         /* Keep refs to known nodes */
 230         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
 231         if (namep == NULL) {
 232                 bootx_printf("Node without a full name !\n");
 233                 namep = "";
 234         }
 235         DBG("* strings: %s\n", namep);
 236
 237         if (!strcmp(namep, "/chosen")) {
 238                 DBG(" detected /chosen ! adding properties names !\n");
 239                 bootx_dt_add_string("linux,bootx", mem_end);
 240                 bootx_dt_add_string("linux,stdout-path", mem_end);
 241                 bootx_dt_add_string("linux,initrd-start", mem_end);
 242                 bootx_dt_add_string("linux,initrd-end", mem_end);
 243                 bootx_dt_add_string("bootargs", mem_end);
 244                 bootx_node_chosen = node;
 245         }
 246         if (node == bootx_info->dispDeviceRegEntryOffset) {
 247                 DBG(" detected display ! adding properties names !\n");
 248                 bootx_dt_add_string("linux,boot-display", mem_end);
 249                 bootx_dt_add_string("linux,opened", mem_end);
 250                 strlcpy(bootx_disp_path, namep, sizeof(bootx_disp_path));
 251         }
 252
 253         /* get and store all property names */
 254         while (*ppp) {
 255                 struct bootx_dt_prop *pp =
 256                         (struct bootx_dt_prop *)(base + *ppp);
 257
 258                 namep = pp->name ? (char *)(base + pp->name) : NULL;
 259                 if (namep == NULL || strcmp(namep, "name") == 0)
 260                         goto next;
 261                 /* get/create string entry */
 262                 soff = bootx_dt_find_string(namep);
 263                 if (soff == 0)
 264                         bootx_dt_add_string(namep, mem_end);
 265         next:
 266                 ppp = &pp->next;
 267         }
 268
 269         /* do all our children */
 270         cpp = &np->child;
 271         while(*cpp) {
 272                 np = (struct bootx_dt_node *)(base + *cpp);
 273                 bootx_scan_dt_build_strings(base, *cpp, mem_end);
 274                 cpp = &np->sibling;
 275         }
 276 }
 277
 278 static void __init bootx_scan_dt_build_struct(unsigned long base,
 279                                               unsigned long node,
 280                                               unsigned long *mem_end)
 281 {
 282         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 283         u32 *cpp, *ppp = &np->properties;
 284         char *namep, *p, *ep, *lp;
 285         int l;
 286
 287         dt_push_token(OF_DT_BEGIN_NODE, mem_end);
 288
 289         /* get the node's full name */
 290         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
 291         if (namep == NULL)
 292                 namep = "";
 293         l = strlen(namep);
 294
 295         DBG("* struct: %s\n", namep);
 296
 297         /* Fixup an Apple bug where they have bogus \0 chars in the
 298          * middle of the path in some properties, and extract
 299          * the unit name (everything after the last '/').
 300          */
 301         memcpy((void *)*mem_end, namep, l + 1);
 302         namep = (char *)*mem_end;
 303         for (lp = p = namep, ep = namep + l; p < ep; p++) {
 304                 if (*p == '/')
 305                         lp = namep;
 306                 else if (*p != 0)
 307                         *lp++ = *p;
 308         }
 309         *lp = 0;
 310         *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
 311
 312         /* get and store all properties */
 313         while (*ppp) {
 314                 struct bootx_dt_prop *pp =
 315                         (struct bootx_dt_prop *)(base + *ppp);
 316
 317                 namep = pp->name ? (char *)(base + pp->name) : NULL;
 318                 /* Skip "name" */
 319                 if (namep == NULL || !strcmp(namep, "name"))
 320                         goto next;
 321                 /* Skip "bootargs" in /chosen too as we replace it */
 322                 if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
 323                         goto next;
 324
 325                 /* push property head */
 326                 bootx_dt_add_prop(namep,
 327                                   pp->value ? (void *)(base + pp->value): NULL,
 328                                   pp->length, mem_end);
 329         next:
 330                 ppp = &pp->next;
 331         }
 332
 333         if (node == bootx_node_chosen) {
 334                 bootx_add_chosen_props(base, mem_end);
 335                 if (bootx_info->dispDeviceRegEntryOffset == 0)
 336                         bootx_add_display_props(base, mem_end, 0);
 337         }
 338         else if (node == bootx_info->dispDeviceRegEntryOffset)
 339                 bootx_add_display_props(base, mem_end, 1);
 340
 341         /* do all our children */
 342         cpp = &np->child;
 343         while(*cpp) {
 344                 np = (struct bootx_dt_node *)(base + *cpp);
 345                 bootx_scan_dt_build_struct(base, *cpp, mem_end);
 346                 cpp = &np->sibling;
 347         }
 348
 349         dt_push_token(OF_DT_END_NODE, mem_end);
 350 }
 351
 352 static unsigned long __init bootx_flatten_dt(unsigned long start)
 353 {
 354         boot_infos_t *bi = bootx_info;
 355         unsigned long mem_start, mem_end;
 356         struct boot_param_header *hdr;
 357         unsigned long base;
 358         u64 *rsvmap;
 359
 360         /* Start using memory after the big blob passed by BootX, get
 361          * some space for the header
 362          */
 363         mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
 364         DBG("Boot params header at: %x\n", mem_start);
 365         hdr = (struct boot_param_header *)mem_start;
 366         mem_end += sizeof(struct boot_param_header);
 367         rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
 368         hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
 369         mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
 370
 371         /* Get base of tree */
 372         base = ((unsigned long)bi) + bi->deviceTreeOffset;
 373
 374         /* Build string array */
 375         DBG("Building string array at: %x\n", mem_end);
 376         DBG("Device Tree Base=%x\n", base);
 377         bootx_dt_strbase = mem_end;
 378         mem_end += 4;
 379         bootx_dt_strend = mem_end;
 380         bootx_scan_dt_build_strings(base, 4, &mem_end);
 381         /* Add some strings */
 382         bootx_dt_add_string("linux,bootx-noscreen", &mem_end);
 383         bootx_dt_add_string("linux,bootx-depth", &mem_end);
 384         bootx_dt_add_string("linux,bootx-width", &mem_end);
 385         bootx_dt_add_string("linux,bootx-height", &mem_end);
 386         bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
 387         bootx_dt_add_string("linux,bootx-addr", &mem_end);
 388         /* Wrap up strings */
 389         hdr->off_dt_strings = bootx_dt_strbase - mem_start;
 390         hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
 391
 392         /* Build structure */
 393         mem_end = _ALIGN(mem_end, 16);
 394         DBG("Building device tree structure at: %x\n", mem_end);
 395         hdr->off_dt_struct = mem_end - mem_start;
 396         bootx_scan_dt_build_struct(base, 4, &mem_end);
 397         dt_push_token(OF_DT_END, &mem_end);
 398
 399         /* Finish header */
 400         hdr->boot_cpuid_phys = 0;
 401         hdr->magic = OF_DT_HEADER;
 402         hdr->totalsize = mem_end - mem_start;
 403         hdr->version = OF_DT_VERSION;
 404         /* Version 16 is not backward compatible */
 405         hdr->last_comp_version = 0x10;
 406
 407         /* Reserve the whole thing and copy the reserve map in, we
 408          * also bump mem_reserve_cnt to cause further reservations to
 409          * fail since it's too late.
 410          */
 411         mem_end = _ALIGN(mem_end, PAGE_SIZE);
 412         DBG("End of boot params: %x\n", mem_end);
 413         rsvmap[0] = mem_start;
 414         rsvmap[1] = mem_end;
 415         if (bootx_info->ramDisk) {
 416                 rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk;
 417                 rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize;
 418                 rsvmap[4] = 0;
 419                 rsvmap[5] = 0;
 420         } else {
 421                 rsvmap[2] = 0;
 422                 rsvmap[3] = 0;
 423         }
 424
 425         return (unsigned long)hdr;
 426 }
 427
 428
 429 #ifdef CONFIG_BOOTX_TEXT
 430 static void __init btext_welcome(boot_infos_t *bi)
 431 {
 432         unsigned long flags;
 433         unsigned long pvr;
 434
 435         bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
 436         bootx_printf("\nlinked at        : 0x%x", KERNELBASE);
 437         bootx_printf("\nframe buffer at  : 0x%x", bi->dispDeviceBase);
 438         bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
 439         bootx_printf(" (log)");
 440         bootx_printf("\nklimit           : 0x%x",(unsigned long)klimit);
 441         bootx_printf("\nboot_info at     : 0x%x", bi);
 442         __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
 443         bootx_printf("\nMSR              : 0x%x", flags);
 444         __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
 445         bootx_printf("\nPVR              : 0x%x", pvr);
 446         pvr >>= 16;
 447         if (pvr > 1) {
 448             __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
 449             bootx_printf("\nHID0             : 0x%x", flags);
 450         }
 451         if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
 452             __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
 453             bootx_printf("\nICTC             : 0x%x", flags);
 454         }
 455 #ifdef DEBUG
 456         bootx_printf("\n\n");
 457         bootx_printf("bi->deviceTreeOffset   : 0x%x\n",
 458                      bi->deviceTreeOffset);
 459         bootx_printf("bi->deviceTreeSize     : 0x%x\n",
 460                      bi->deviceTreeSize);
 461 #endif
 462         bootx_printf("\n\n");
 463 }
 464 #endif /* CONFIG_BOOTX_TEXT */
 465
 466 void __init bootx_init(unsigned long r3, unsigned long r4)
 467 {
 468         boot_infos_t *bi = (boot_infos_t *) r4;
 469         unsigned long hdr;
 470         unsigned long space;
 471         unsigned long ptr, x;
 472         char *model;
 473         unsigned long offset = reloc_offset();
 474
 475         reloc_got2(offset);
 476
 477         bootx_info = bi;
 478
 479         /* We haven't cleared any bss at this point, make sure
 480          * what we need is initialized
 481          */
 482         bootx_dt_strbase = bootx_dt_strend = 0;
 483         bootx_node_chosen = 0;
 484         bootx_disp_path[0] = 0;
 485
 486         if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
 487                 bi->logicalDisplayBase = bi->dispDeviceBase;
 488
 489         /* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
 490         if (bi->dispDeviceDepth == 16)
 491                 bi->dispDeviceDepth = 15;
 492
 493
 494 #ifdef CONFIG_BOOTX_TEXT
 495         ptr = (unsigned long)bi->logicalDisplayBase;
 496         ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
 497         ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
 498         btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
 499                             bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
 500                             bi->dispDeviceDepth, bi->dispDeviceRowBytes,
 501                             (unsigned long)bi->logicalDisplayBase);
 502         btext_clearscreen();
 503         btext_flushscreen();
 504 #endif /* CONFIG_BOOTX_TEXT */
 505
 506         /*
 507          * Test if boot-info is compatible.  Done only in config
 508          * CONFIG_BOOTX_TEXT since there is nothing much we can do
 509          * with an incompatible version, except display a message
 510          * and eventually hang the processor...
 511          *
 512          * I'll try to keep enough of boot-info compatible in the
 513          * future to always allow display of this message;
 514          */
 515         if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
 516                 bootx_printf(" !!! WARNING - Incompatible version"
 517                              " of BootX !!!\n\n\n");
 518                 for (;;)
 519                         ;
 520         }
 521         if (bi->architecture != BOOT_ARCH_PCI) {
 522                 bootx_printf(" !!! WARNING - Usupported machine"
 523                              " architecture !\n");
 524                 for (;;)
 525                         ;
 526         }
 527
 528 #ifdef CONFIG_BOOTX_TEXT
 529         btext_welcome(bi);
 530 #endif
 531
 532         /* New BootX enters kernel with MMU off, i/os are not allowed
 533          * here. This hack will have been done by the boostrap anyway.
 534          */
 535         if (bi->version < 4) {
 536                 /*
 537                  * XXX If this is an iMac, turn off the USB controller.
 538                  */
 539                 model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
 540                                                      4, "model");
 541                 if (model
 542                     && (strcmp(model, "iMac,1") == 0
 543                         || strcmp(model, "PowerMac1,1") == 0)) {
 544                         bootx_printf("iMac,1 detected, shutting down USB\n");
 545                         out_le32((unsigned __iomem *)0x80880008, 1);    /* XXX */
 546                 }
 547         }
 548
 549         /* Get a pointer that points above the device tree, args, ramdisk,
 550          * etc... to use for generating the flattened tree
 551          */
 552         if (bi->version < 5) {
 553                 space = bi->deviceTreeOffset + bi->deviceTreeSize;
 554                 if (bi->ramDisk >= space)
 555                         space = bi->ramDisk + bi->ramDiskSize;
 556         } else
 557                 space = bi->totalParamsSize;
 558
 559         bootx_printf("Total space used by parameters & ramdisk: 0x%x\n", space);
 560
 561         /* New BootX will have flushed all TLBs and enters kernel with
 562          * MMU switched OFF, so this should not be useful anymore.
 563          */
 564         if (bi->version < 4) {
 565                 bootx_printf("Touching pages...\n");
 566
 567                 /*
 568                  * Touch each page to make sure the PTEs for them
 569                  * are in the hash table - the aim is to try to avoid
 570                  * getting DSI exceptions while copying the kernel image.
 571                  */
 572                 for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
 573                      ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
 574                         x = *(volatile unsigned long *)ptr;
 575         }
 576
 577         /* Ok, now we need to generate a flattened device-tree to pass
 578          * to the kernel
 579          */
 580         bootx_printf("Preparing boot params...\n");
 581
 582         hdr = bootx_flatten_dt(space);
 583
 584 #ifdef CONFIG_BOOTX_TEXT
 585 #ifdef SET_BOOT_BAT
 586         bootx_printf("Preparing BAT...\n");
 587         btext_prepare_BAT();
 588 #else
 589         btext_unmap();
 590 #endif
 591 #endif
 592
 593         reloc_got2(-offset);
 594
 595         __start(hdr, KERNELBASE + offset, 0);
 596 }