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 } 595