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
  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
  32 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
  33
  34 static unsigned long __initdata bootx_dt_strbase;
  35 static unsigned long __initdata bootx_dt_strend;
  36 static unsigned long __initdata bootx_node_chosen;
  37 static boot_infos_t * __initdata bootx_info;
  38 static 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
  47 static 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 */
  88 static void __init bootx_printf(const char *format, ...) {}
  89 #endif /* CONFIG_BOOTX_TEXT */
  90
  91 static 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
 118 static 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
 132 static 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
 159 static 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
 182 static 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
 211 static 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
 218 static 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
 276 static 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
 350 static 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
 428 static 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
 464 void __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 }