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 } 88 #else /* CONFIG_BOOTX_TEXT */ 89 static void __init bootx_printf(const char *format, ...) {} 90 #endif /* CONFIG_BOOTX_TEXT */ 91 92 static void * __init bootx_early_getprop(unsigned long base, 93 unsigned long node, 94 char *prop) 95 { 96 struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node); 97 u32 *ppp = &np->properties; 98 99 while(*ppp) { 100 struct bootx_dt_prop *pp = 101 (struct bootx_dt_prop *)(base + *ppp); 102 103 if (strcmp((char *)((unsigned long)pp->name + base), 104 prop) == 0) { 105 return (void *)((unsigned long)pp->value + base); 106 } 107 ppp = &pp->next; 108 } 109 return NULL; 110 } 111 112 #define dt_push_token(token, mem) \ 113 do { \ 114 *(mem) = _ALIGN_UP(*(mem),4); \ 115 *((u32 *)*(mem)) = token; \ 116 *(mem) += 4; \ 117 } while(0) 118 119 static unsigned long __init bootx_dt_find_string(char *str) 120 { 121 char *s, *os; 122 123 s = os = (char *)bootx_dt_strbase; 124 s += 4; 125 while (s < (char *)bootx_dt_strend) { 126 if (strcmp(s, str) == 0) 127 return s - os; 128 s += strlen(s) + 1; 129 } 130 return 0; 131 } 132 133 static void __init bootx_dt_add_prop(char *name, void *data, int size, 134 unsigned long *mem_end) 135 { 136 unsigned long soff = bootx_dt_find_string(name); 137 if (data == NULL) 138 size = 0; 139 if (soff == 0) { 140 bootx_printf("WARNING: Can't find string index for <%s>\n", 141 name); 142 return; 143 } 144 if (size > 0x20000) { 145 bootx_printf("WARNING: ignoring large property "); 146 bootx_printf("%s length 0x%x\n", name, size); 147 return; 148 } 149 dt_push_token(OF_DT_PROP, mem_end); 150 dt_push_token(size, mem_end); 151 dt_push_token(soff, mem_end); 152 153 /* push property content */ 154 if (size && data) { 155 memcpy((void *)*mem_end, data, size); 156 *mem_end = _ALIGN_UP(*mem_end + size, 4); 157 } 158 } 159 160 static void __init bootx_add_chosen_props(unsigned long base, 161 unsigned long *mem_end) 162 { 163 u32 val; 164 165 bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end); 166 167 if (bootx_info->kernelParamsOffset) { 168 char *args = (char *)((unsigned long)bootx_info) + 169 bootx_info->kernelParamsOffset; 170 bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end); 171 } 172 if (bootx_info->ramDisk) { 173 val = ((unsigned long)bootx_info) + bootx_info->ramDisk; 174 bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end); 175 val += bootx_info->ramDiskSize; 176 bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end); 177 } 178 if (strlen(bootx_disp_path)) 179 bootx_dt_add_prop("linux,stdout-path", bootx_disp_path, 180 strlen(bootx_disp_path) + 1, mem_end); 181 } 182 183 static void __init bootx_add_display_props(unsigned long base, 184 unsigned long *mem_end, 185 int has_real_node) 186 { 187 boot_infos_t *bi = bootx_info; 188 u32 tmp; 189 190 if (has_real_node) { 191 bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end); 192 bootx_dt_add_prop("linux,opened", NULL, 0, mem_end); 193 } else 194 bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end); 195 196 tmp = bi->dispDeviceDepth; 197 bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end); 198 tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0]; 199 bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end); 200 tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1]; 201 bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end); 202 tmp = bi->dispDeviceRowBytes; 203 bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end); 204 tmp = (u32)bi->dispDeviceBase; 205 if (tmp == 0) 206 tmp = (u32)bi->logicalDisplayBase; 207 tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes; 208 tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8); 209 bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end); 210 } 211 212 static void __init bootx_dt_add_string(char *s, unsigned long *mem_end) 213 { 214 unsigned int l = strlen(s) + 1; 215 memcpy((void *)*mem_end, s, l); 216 bootx_dt_strend = *mem_end = *mem_end + l; 217 } 218 219 static void __init bootx_scan_dt_build_strings(unsigned long base, 220 unsigned long node, 221 unsigned long *mem_end) 222 { 223 struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node); 224 u32 *cpp, *ppp = &np->properties; 225 unsigned long soff; 226 char *namep; 227 228 /* Keep refs to known nodes */ 229 namep = np->full_name ? (char *)(base + np->full_name) : NULL; 230 if (namep == NULL) { 231 bootx_printf("Node without a full name !\n"); 232 namep = ""; 233 } 234 DBG("* strings: %s\n", namep); 235 236 if (!strcmp(namep, "/chosen")) { 237 DBG(" detected /chosen ! adding properties names !\n"); 238 bootx_dt_add_string("linux,bootx", mem_end); 239 bootx_dt_add_string("linux,stdout-path", mem_end); 240 bootx_dt_add_string("linux,initrd-start", mem_end); 241 bootx_dt_add_string("linux,initrd-end", mem_end); 242 bootx_dt_add_string("bootargs", mem_end); 243 bootx_node_chosen = node; 244 } 245 if (node == bootx_info->dispDeviceRegEntryOffset) { 246 DBG(" detected display ! adding properties names !\n"); 247 bootx_dt_add_string("linux,boot-display", mem_end); 248 bootx_dt_add_string("linux,opened", mem_end); 249 strlcpy(bootx_disp_path, namep, sizeof(bootx_disp_path)); 250 } 251 252 /* get and store all property names */ 253 while (*ppp) { 254 struct bootx_dt_prop *pp = 255 (struct bootx_dt_prop *)(base + *ppp); 256 257 namep = pp->name ? (char *)(base + pp->name) : NULL; 258 if (namep == NULL || strcmp(namep, "name") == 0) 259 goto next; 260 /* get/create string entry */ 261 soff = bootx_dt_find_string(namep); 262 if (soff == 0) 263 bootx_dt_add_string(namep, mem_end); 264 next: 265 ppp = &pp->next; 266 } 267 268 /* do all our children */ 269 cpp = &np->child; 270 while(*cpp) { 271 np = (struct bootx_dt_node *)(base + *cpp); 272 bootx_scan_dt_build_strings(base, *cpp, mem_end); 273 cpp = &np->sibling; 274 } 275 } 276 277 static void __init bootx_scan_dt_build_struct(unsigned long base, 278 unsigned long node, 279 unsigned long *mem_end) 280 { 281 struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node); 282 u32 *cpp, *ppp = &np->properties; 283 char *namep, *p, *ep, *lp; 284 int l; 285 286 dt_push_token(OF_DT_BEGIN_NODE, mem_end); 287 288 /* get the node's full name */ 289 namep = np->full_name ? (char *)(base + np->full_name) : NULL; 290 if (namep == NULL) 291 namep = ""; 292 l = strlen(namep); 293 294 DBG("* struct: %s\n", namep); 295 296 /* Fixup an Apple bug where they have bogus \0 chars in the 297 * middle of the path in some properties, and extract 298 * the unit name (everything after the last '/'). 299 */ 300 memcpy((void *)*mem_end, namep, l + 1); 301 namep = (char *)*mem_end; 302 for (lp = p = namep, ep = namep + l; p < ep; p++) { 303 if (*p == '/') 304 lp = namep; 305 else if (*p != 0) 306 *lp++ = *p; 307 } 308 *lp = 0; 309 *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4); 310 311 /* get and store all properties */ 312 while (*ppp) { 313 struct bootx_dt_prop *pp = 314 (struct bootx_dt_prop *)(base + *ppp); 315 316 namep = pp->name ? (char *)(base + pp->name) : NULL; 317 /* Skip "name" */ 318 if (namep == NULL || !strcmp(namep, "name")) 319 goto next; 320 /* Skip "bootargs" in /chosen too as we replace it */ 321 if (node == bootx_node_chosen && !strcmp(namep, "bootargs")) 322 goto next; 323 324 /* push property head */ 325 bootx_dt_add_prop(namep, 326 pp->value ? (void *)(base + pp->value): NULL, 327 pp->length, mem_end); 328 next: 329 ppp = &pp->next; 330 } 331 332 if (node == bootx_node_chosen) { 333 bootx_add_chosen_props(base, mem_end); 334 if (bootx_info->dispDeviceRegEntryOffset == 0) 335 bootx_add_display_props(base, mem_end, 0); 336 } 337 else if (node == bootx_info->dispDeviceRegEntryOffset) 338 bootx_add_display_props(base, mem_end, 1); 339 340 /* do all our children */ 341 cpp = &np->child; 342 while(*cpp) { 343 np = (struct bootx_dt_node *)(base + *cpp); 344 bootx_scan_dt_build_struct(base, *cpp, mem_end); 345 cpp = &np->sibling; 346 } 347 348 dt_push_token(OF_DT_END_NODE, mem_end); 349 } 350 351 static unsigned long __init bootx_flatten_dt(unsigned long start) 352 { 353 boot_infos_t *bi = bootx_info; 354 unsigned long mem_start, mem_end; 355 struct boot_param_header *hdr; 356 unsigned long base; 357 u64 *rsvmap; 358 359 /* Start using memory after the big blob passed by BootX, get 360 * some space for the header 361 */ 362 mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4); 363 DBG("Boot params header at: %x\n", mem_start); 364 hdr = (struct boot_param_header *)mem_start; 365 mem_end += sizeof(struct boot_param_header); 366 rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8)); 367 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start; 368 mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64); 369 370 /* Get base of tree */ 371 base = ((unsigned long)bi) + bi->deviceTreeOffset; 372 373 /* Build string array */ 374 DBG("Building string array at: %x\n", mem_end); 375 DBG("Device Tree Base=%x\n", base); 376 bootx_dt_strbase = mem_end; 377 mem_end += 4; 378 bootx_dt_strend = mem_end; 379 bootx_scan_dt_build_strings(base, 4, &mem_end); 380 /* Add some strings */ 381 bootx_dt_add_string("linux,bootx-noscreen", &mem_end); 382 bootx_dt_add_string("linux,bootx-depth", &mem_end); 383 bootx_dt_add_string("linux,bootx-width", &mem_end); 384 bootx_dt_add_string("linux,bootx-height", &mem_end); 385 bootx_dt_add_string("linux,bootx-linebytes", &mem_end); 386 bootx_dt_add_string("linux,bootx-addr", &mem_end); 387 /* Wrap up strings */ 388 hdr->off_dt_strings = bootx_dt_strbase - mem_start; 389 hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase; 390 391 /* Build structure */ 392 mem_end = _ALIGN(mem_end, 16); 393 DBG("Building device tree structure at: %x\n", mem_end); 394 hdr->off_dt_struct = mem_end - mem_start; 395 bootx_scan_dt_build_struct(base, 4, &mem_end); 396 dt_push_token(OF_DT_END, &mem_end); 397 398 /* Finish header */ 399 hdr->boot_cpuid_phys = 0; 400 hdr->magic = OF_DT_HEADER; 401 hdr->totalsize = mem_end - mem_start; 402 hdr->version = OF_DT_VERSION; 403 /* Version 16 is not backward compatible */ 404 hdr->last_comp_version = 0x10; 405 406 /* Reserve the whole thing and copy the reserve map in, we 407 * also bump mem_reserve_cnt to cause further reservations to 408 * fail since it's too late. 409 */ 410 mem_end = _ALIGN(mem_end, PAGE_SIZE); 411 DBG("End of boot params: %x\n", mem_end); 412 rsvmap[0] = mem_start; 413 rsvmap[1] = mem_end; 414 if (bootx_info->ramDisk) { 415 rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk; 416 rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize; 417 rsvmap[4] = 0; 418 rsvmap[5] = 0; 419 } else { 420 rsvmap[2] = 0; 421 rsvmap[3] = 0; 422 } 423 424 return (unsigned long)hdr; 425 } 426 427 428 #ifdef CONFIG_BOOTX_TEXT 429 static void __init btext_welcome(boot_infos_t *bi) 430 { 431 unsigned long flags; 432 unsigned long pvr; 433 434 bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n"); 435 bootx_printf("\nlinked at : 0x%x", KERNELBASE); 436 bootx_printf("\nframe buffer at : 0x%x", bi->dispDeviceBase); 437 bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase); 438 bootx_printf(" (log)"); 439 bootx_printf("\nklimit : 0x%x",(unsigned long)klimit); 440 bootx_printf("\nboot_info at : 0x%x", bi); 441 __asm__ __volatile__ ("mfmsr %0" : "=r" (flags)); 442 bootx_printf("\nMSR : 0x%x", flags); 443 __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr)); 444 bootx_printf("\nPVR : 0x%x", pvr); 445 pvr >>= 16; 446 if (pvr > 1) { 447 __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags)); 448 bootx_printf("\nHID0 : 0x%x", flags); 449 } 450 if (pvr == 8 || pvr == 12 || pvr == 0x800c) { 451 __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags)); 452 bootx_printf("\nICTC : 0x%x", flags); 453 } 454 #ifdef DEBUG 455 bootx_printf("\n\n"); 456 bootx_printf("bi->deviceTreeOffset : 0x%x\n", 457 bi->deviceTreeOffset); 458 bootx_printf("bi->deviceTreeSize : 0x%x\n", 459 bi->deviceTreeSize); 460 #endif 461 bootx_printf("\n\n"); 462 } 463 #endif /* CONFIG_BOOTX_TEXT */ 464 465 void __init bootx_init(unsigned long r3, unsigned long r4) 466 { 467 boot_infos_t *bi = (boot_infos_t *) r4; 468 unsigned long hdr; 469 unsigned long space; 470 unsigned long ptr, x; 471 char *model; 472 unsigned long offset = reloc_offset(); 473 474 reloc_got2(offset); 475 476 bootx_info = bi; 477 478 /* We haven't cleared any bss at this point, make sure 479 * what we need is initialized 480 */ 481 bootx_dt_strbase = bootx_dt_strend = 0; 482 bootx_node_chosen = 0; 483 bootx_disp_path[0] = 0; 484 485 if (!BOOT_INFO_IS_V2_COMPATIBLE(bi)) 486 bi->logicalDisplayBase = bi->dispDeviceBase; 487 488 /* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */ 489 if (bi->dispDeviceDepth == 16) 490 bi->dispDeviceDepth = 15; 491 492 493 #ifdef CONFIG_BOOTX_TEXT 494 ptr = (unsigned long)bi->logicalDisplayBase; 495 ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes; 496 ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8); 497 btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0], 498 bi->dispDeviceRect[3] - bi->dispDeviceRect[1], 499 bi->dispDeviceDepth, bi->dispDeviceRowBytes, 500 (unsigned long)bi->logicalDisplayBase); 501 btext_clearscreen(); 502 btext_flushscreen(); 503 #endif /* CONFIG_BOOTX_TEXT */ 504 505 /* 506 * Test if boot-info is compatible. Done only in config 507 * CONFIG_BOOTX_TEXT since there is nothing much we can do 508 * with an incompatible version, except display a message 509 * and eventually hang the processor... 510 * 511 * I'll try to keep enough of boot-info compatible in the 512 * future to always allow display of this message; 513 */ 514 if (!BOOT_INFO_IS_COMPATIBLE(bi)) { 515 bootx_printf(" !!! WARNING - Incompatible version" 516 " of BootX !!!\n\n\n"); 517 for (;;) 518 ; 519 } 520 if (bi->architecture != BOOT_ARCH_PCI) { 521 bootx_printf(" !!! WARNING - Usupported machine" 522 " architecture !\n"); 523 for (;;) 524 ; 525 } 526 527 #ifdef CONFIG_BOOTX_TEXT 528 btext_welcome(bi); 529 #endif 530 531 /* New BootX enters kernel with MMU off, i/os are not allowed 532 * here. This hack will have been done by the boostrap anyway. 533 */ 534 if (bi->version < 4) { 535 /* 536 * XXX If this is an iMac, turn off the USB controller. 537 */ 538 model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset, 539 4, "model"); 540 if (model 541 && (strcmp(model, "iMac,1") == 0 542 || strcmp(model, "PowerMac1,1") == 0)) { 543 bootx_printf("iMac,1 detected, shutting down USB\n"); 544 out_le32((unsigned __iomem *)0x80880008, 1); /* XXX */ 545 } 546 } 547 548 /* Get a pointer that points above the device tree, args, ramdisk, 549 * etc... to use for generating the flattened tree 550 */ 551 if (bi->version < 5) { 552 space = bi->deviceTreeOffset + bi->deviceTreeSize; 553 if (bi->ramDisk >= space) 554 space = bi->ramDisk + bi->ramDiskSize; 555 } else 556 space = bi->totalParamsSize; 557 558 bootx_printf("Total space used by parameters & ramdisk: 0x%x\n", space); 559 560 /* New BootX will have flushed all TLBs and enters kernel with 561 * MMU switched OFF, so this should not be useful anymore. 562 */ 563 if (bi->version < 4) { 564 bootx_printf("Touching pages...\n"); 565 566 /* 567 * Touch each page to make sure the PTEs for them 568 * are in the hash table - the aim is to try to avoid 569 * getting DSI exceptions while copying the kernel image. 570 */ 571 for (ptr = ((unsigned long) &_stext) & PAGE_MASK; 572 ptr < (unsigned long)bi + space; ptr += PAGE_SIZE) 573 x = *(volatile unsigned long *)ptr; 574 } 575 576 /* Ok, now we need to generate a flattened device-tree to pass 577 * to the kernel 578 */ 579 bootx_printf("Preparing boot params...\n"); 580 581 hdr = bootx_flatten_dt(space); 582 583 #ifdef CONFIG_BOOTX_TEXT 584 #ifdef SET_BOOT_BAT 585 bootx_printf("Preparing BAT...\n"); 586 btext_prepare_BAT(); 587 #else 588 btext_unmap(); 589 #endif 590 #endif 591 592 reloc_got2(-offset); 593 594 __start(hdr, KERNELBASE + offset, 0); 595 } 596