1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1995 Linus Torvalds 7 * Copyright (C) 1995 Waldorf Electronics 8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle 9 * Copyright (C) 1996 Stoned Elipot 10 * Copyright (C) 1999 Silicon Graphics, Inc. 11 * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki 12 */ 13 #include <linux/config.h> 14 #include <linux/errno.h> 15 #include <linux/init.h> 16 #include <linux/ioport.h> 17 #include <linux/sched.h> 18 #include <linux/kernel.h> 19 #include <linux/mm.h> 20 #include <linux/module.h> 21 #include <linux/stddef.h> 22 #include <linux/string.h> 23 #include <linux/unistd.h> 24 #include <linux/slab.h> 25 #include <linux/user.h> 26 #include <linux/utsname.h> 27 #include <linux/a.out.h> 28 #include <linux/tty.h> 29 #include <linux/bootmem.h> 30 #include <linux/initrd.h> 31 #include <linux/major.h> 32 #include <linux/kdev_t.h> 33 #include <linux/root_dev.h> 34 #include <linux/highmem.h> 35 #include <linux/console.h> 36 #include <linux/mmzone.h> 37 38 #include <asm/addrspace.h> 39 #include <asm/bootinfo.h> 40 #include <asm/cpu.h> 41 #include <asm/sections.h> 42 #include <asm/setup.h> 43 #include <asm/system.h> 44 45 struct cpuinfo_mips cpu_data[NR_CPUS]; 46 47 EXPORT_SYMBOL(cpu_data); 48 49 #ifdef CONFIG_VT 50 struct screen_info screen_info; 51 #endif 52 53 /* 54 * Despite it's name this variable is even if we don't have PCI 55 */ 56 unsigned int PCI_DMA_BUS_IS_PHYS; 57 58 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); 59 60 /* 61 * Setup information 62 * 63 * These are initialized so they are in the .data section 64 */ 65 unsigned long mips_machtype = MACH_UNKNOWN; 66 unsigned long mips_machgroup = MACH_GROUP_UNKNOWN; 67 68 EXPORT_SYMBOL(mips_machtype); 69 EXPORT_SYMBOL(mips_machgroup); 70 71 struct boot_mem_map boot_mem_map; 72 73 static char command_line[CL_SIZE]; 74 char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; 75 76 /* 77 * mips_io_port_base is the begin of the address space to which x86 style 78 * I/O ports are mapped. 79 */ 80 const unsigned long mips_io_port_base = -1; 81 EXPORT_SYMBOL(mips_io_port_base); 82 83 /* 84 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped 85 * for the processor. 86 */ 87 unsigned long isa_slot_offset; 88 EXPORT_SYMBOL(isa_slot_offset); 89 90 static struct resource code_resource = { .name = "Kernel code", }; 91 static struct resource data_resource = { .name = "Kernel data", }; 92 93 void __init add_memory_region(phys_t start, phys_t size, long type) 94 { 95 int x = boot_mem_map.nr_map; 96 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; 97 98 /* 99 * Try to merge with previous entry if any. This is far less than 100 * perfect but is sufficient for most real world cases. 101 */ 102 if (x && prev->addr + prev->size == start && prev->type == type) { 103 prev->size += size; 104 return; 105 } 106 107 if (x == BOOT_MEM_MAP_MAX) { 108 printk("Ooops! Too many entries in the memory map!\n"); 109 return; 110 } 111 112 boot_mem_map.map[x].addr = start; 113 boot_mem_map.map[x].size = size; 114 boot_mem_map.map[x].type = type; 115 boot_mem_map.nr_map++; 116 } 117 118 static void __init print_memory_map(void) 119 { 120 int i; 121 const int field = 2 * sizeof(unsigned long); 122 123 for (i = 0; i < boot_mem_map.nr_map; i++) { 124 printk(" memory: %0*Lx @ %0*Lx ", 125 field, (unsigned long long) boot_mem_map.map[i].size, 126 field, (unsigned long long) boot_mem_map.map[i].addr); 127 128 switch (boot_mem_map.map[i].type) { 129 case BOOT_MEM_RAM: 130 printk("(usable)\n"); 131 break; 132 case BOOT_MEM_ROM_DATA: 133 printk("(ROM data)\n"); 134 break; 135 case BOOT_MEM_RESERVED: 136 printk("(reserved)\n"); 137 break; 138 default: 139 printk("type %lu\n", boot_mem_map.map[i].type); 140 break; 141 } 142 } 143 } 144 145 static inline void parse_cmdline_early(void) 146 { 147 char c = ' ', *to = command_line, *from = saved_command_line; 148 unsigned long start_at, mem_size; 149 int len = 0; 150 int usermem = 0; 151 152 printk("Determined physical RAM map:\n"); 153 print_memory_map(); 154 155 for (;;) { 156 /* 157 * "mem=XXX[kKmM]" defines a memory region from 158 * 0 to <XXX>, overriding the determined size. 159 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from 160 * <YYY> to <YYY>+<XXX>, overriding the determined size. 161 */ 162 if (c == ' ' && !memcmp(from, "mem=", 4)) { 163 if (to != command_line) 164 to--; 165 /* 166 * If a user specifies memory size, we 167 * blow away any automatically generated 168 * size. 169 */ 170 if (usermem == 0) { 171 boot_mem_map.nr_map = 0; 172 usermem = 1; 173 } 174 mem_size = memparse(from + 4, &from); 175 if (*from == '@') 176 start_at = memparse(from + 1, &from); 177 else 178 start_at = 0; 179 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 180 } 181 c = *(from++); 182 if (!c) 183 break; 184 if (CL_SIZE <= ++len) 185 break; 186 *(to++) = c; 187 } 188 *to = '\0'; 189 190 if (usermem) { 191 printk("User-defined physical RAM map:\n"); 192 print_memory_map(); 193 } 194 } 195 196 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end) 197 { 198 /* 199 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd 200 * "rd_size=0xNN" it's size 201 */ 202 unsigned long start = 0; 203 unsigned long size = 0; 204 unsigned long end; 205 char cmd_line[CL_SIZE]; 206 char *start_str; 207 char *size_str; 208 char *tmp; 209 210 strcpy(cmd_line, command_line); 211 *command_line = 0; 212 tmp = cmd_line; 213 /* Ignore "rd_start=" strings in other parameters. */ 214 start_str = strstr(cmd_line, "rd_start="); 215 if (start_str && start_str != cmd_line && *(start_str - 1) != ' ') 216 start_str = strstr(start_str, " rd_start="); 217 while (start_str) { 218 if (start_str != cmd_line) 219 strncat(command_line, tmp, start_str - tmp); 220 start = memparse(start_str + 9, &start_str); 221 tmp = start_str + 1; 222 start_str = strstr(start_str, " rd_start="); 223 } 224 if (*tmp) 225 strcat(command_line, tmp); 226 227 strcpy(cmd_line, command_line); 228 *command_line = 0; 229 tmp = cmd_line; 230 /* Ignore "rd_size" strings in other parameters. */ 231 size_str = strstr(cmd_line, "rd_size="); 232 if (size_str && size_str != cmd_line && *(size_str - 1) != ' ') 233 size_str = strstr(size_str, " rd_size="); 234 while (size_str) { 235 if (size_str != cmd_line) 236 strncat(command_line, tmp, size_str - tmp); 237 size = memparse(size_str + 8, &size_str); 238 tmp = size_str + 1; 239 size_str = strstr(size_str, " rd_size="); 240 } 241 if (*tmp) 242 strcat(command_line, tmp); 243 244 #ifdef CONFIG_MIPS64 245 /* HACK: Guess if the sign extension was forgotten */ 246 if (start > 0x0000000080000000 && start < 0x00000000ffffffff) 247 start |= 0xffffffff00000000; 248 #endif 249 250 end = start + size; 251 if (start && end) { 252 *rd_start = start; 253 *rd_end = end; 254 return 1; 255 } 256 return 0; 257 } 258 259 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT) 260 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 261 #define PFN_PHYS(x) ((x) << PAGE_SHIFT) 262 263 #define MAXMEM HIGHMEM_START 264 #define MAXMEM_PFN PFN_DOWN(MAXMEM) 265 266 static inline void bootmem_init(void) 267 { 268 unsigned long start_pfn; 269 unsigned long reserved_end = (unsigned long)&_end; 270 #ifndef CONFIG_SGI_IP27 271 unsigned long first_usable_pfn; 272 unsigned long bootmap_size; 273 int i; 274 #endif 275 #ifdef CONFIG_BLK_DEV_INITRD 276 int initrd_reserve_bootmem = 0; 277 278 /* Board specific code should have set up initrd_start and initrd_end */ 279 ROOT_DEV = Root_RAM0; 280 if (parse_rd_cmdline(&initrd_start, &initrd_end)) { 281 reserved_end = max(reserved_end, initrd_end); 282 initrd_reserve_bootmem = 1; 283 } else { 284 unsigned long tmp; 285 u32 *initrd_header; 286 287 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2; 288 if (tmp < reserved_end) 289 tmp += PAGE_SIZE; 290 initrd_header = (u32 *)tmp; 291 if (initrd_header[0] == 0x494E5244) { 292 initrd_start = (unsigned long)&initrd_header[2]; 293 initrd_end = initrd_start + initrd_header[1]; 294 reserved_end = max(reserved_end, initrd_end); 295 initrd_reserve_bootmem = 1; 296 } 297 } 298 #endif /* CONFIG_BLK_DEV_INITRD */ 299 300 /* 301 * Partially used pages are not usable - thus 302 * we are rounding upwards. 303 */ 304 start_pfn = PFN_UP(CPHYSADDR(reserved_end)); 305 306 #ifndef CONFIG_SGI_IP27 307 /* Find the highest page frame number we have available. */ 308 max_pfn = 0; 309 first_usable_pfn = -1UL; 310 for (i = 0; i < boot_mem_map.nr_map; i++) { 311 unsigned long start, end; 312 313 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 314 continue; 315 316 start = PFN_UP(boot_mem_map.map[i].addr); 317 end = PFN_DOWN(boot_mem_map.map[i].addr 318 + boot_mem_map.map[i].size); 319 320 if (start >= end) 321 continue; 322 if (end > max_pfn) 323 max_pfn = end; 324 if (start < first_usable_pfn) { 325 if (start > start_pfn) { 326 first_usable_pfn = start; 327 } else if (end > start_pfn) { 328 first_usable_pfn = start_pfn; 329 } 330 } 331 } 332 333 /* 334 * Determine low and high memory ranges 335 */ 336 max_low_pfn = max_pfn; 337 if (max_low_pfn > MAXMEM_PFN) { 338 max_low_pfn = MAXMEM_PFN; 339 #ifndef CONFIG_HIGHMEM 340 /* Maximum memory usable is what is directly addressable */ 341 printk(KERN_WARNING "Warning only %ldMB will be used.\n", 342 MAXMEM >> 20); 343 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); 344 #endif 345 } 346 347 #ifdef CONFIG_HIGHMEM 348 /* 349 * Crude, we really should make a better attempt at detecting 350 * highstart_pfn 351 */ 352 highstart_pfn = highend_pfn = max_pfn; 353 if (max_pfn > MAXMEM_PFN) { 354 highstart_pfn = MAXMEM_PFN; 355 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 356 (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT)); 357 } 358 #endif 359 360 memory_present(0, first_usable_pfn, max_low_pfn); 361 362 /* Initialize the boot-time allocator with low memory only. */ 363 bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn); 364 365 /* 366 * Register fully available low RAM pages with the bootmem allocator. 367 */ 368 for (i = 0; i < boot_mem_map.nr_map; i++) { 369 unsigned long curr_pfn, last_pfn, size; 370 371 /* 372 * Reserve usable memory. 373 */ 374 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 375 continue; 376 377 /* 378 * We are rounding up the start address of usable memory: 379 */ 380 curr_pfn = PFN_UP(boot_mem_map.map[i].addr); 381 if (curr_pfn >= max_low_pfn) 382 continue; 383 if (curr_pfn < start_pfn) 384 curr_pfn = start_pfn; 385 386 /* 387 * ... and at the end of the usable range downwards: 388 */ 389 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr 390 + boot_mem_map.map[i].size); 391 392 if (last_pfn > max_low_pfn) 393 last_pfn = max_low_pfn; 394 395 /* 396 * Only register lowmem part of lowmem segment with bootmem. 397 */ 398 size = last_pfn - curr_pfn; 399 if (curr_pfn > PFN_DOWN(HIGHMEM_START)) 400 continue; 401 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START)) 402 size = PFN_DOWN(HIGHMEM_START) - curr_pfn; 403 if (!size) 404 continue; 405 406 /* 407 * ... finally, did all the rounding and playing 408 * around just make the area go away? 409 */ 410 if (last_pfn <= curr_pfn) 411 continue; 412 413 /* Register lowmem ranges */ 414 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); 415 } 416 417 /* Reserve the bootmap memory. */ 418 reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size); 419 #endif /* CONFIG_SGI_IP27 */ 420 421 #ifdef CONFIG_BLK_DEV_INITRD 422 initrd_below_start_ok = 1; 423 if (initrd_start) { 424 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start); 425 printk("Initial ramdisk at: 0x%p (%lu bytes)\n", 426 (void *)initrd_start, initrd_size); 427 428 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) { 429 printk("initrd extends beyond end of memory " 430 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n", 431 sizeof(long) * 2, 432 (unsigned long long)CPHYSADDR(initrd_end), 433 sizeof(long) * 2, 434 (unsigned long long)PFN_PHYS(max_low_pfn)); 435 initrd_start = initrd_end = 0; 436 initrd_reserve_bootmem = 0; 437 } 438 439 if (initrd_reserve_bootmem) 440 reserve_bootmem(CPHYSADDR(initrd_start), initrd_size); 441 } 442 #endif /* CONFIG_BLK_DEV_INITRD */ 443 } 444 445 static inline void resource_init(void) 446 { 447 int i; 448 449 #if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64) 450 /* 451 * The 64bit code in 32bit object format trick can't represent 452 * 64bit wide relocations for linker script symbols. 453 */ 454 code_resource.start = CPHYSADDR(&_text); 455 code_resource.end = CPHYSADDR(&_etext) - 1; 456 data_resource.start = CPHYSADDR(&_etext); 457 data_resource.end = CPHYSADDR(&_edata) - 1; 458 #else 459 code_resource.start = virt_to_phys(&_text); 460 code_resource.end = virt_to_phys(&_etext) - 1; 461 data_resource.start = virt_to_phys(&_etext); 462 data_resource.end = virt_to_phys(&_edata) - 1; 463 #endif 464 465 /* 466 * Request address space for all standard RAM. 467 */ 468 for (i = 0; i < boot_mem_map.nr_map; i++) { 469 struct resource *res; 470 unsigned long start, end; 471 472 start = boot_mem_map.map[i].addr; 473 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; 474 if (start >= MAXMEM) 475 continue; 476 if (end >= MAXMEM) 477 end = MAXMEM - 1; 478 479 res = alloc_bootmem(sizeof(struct resource)); 480 switch (boot_mem_map.map[i].type) { 481 case BOOT_MEM_RAM: 482 case BOOT_MEM_ROM_DATA: 483 res->name = "System RAM"; 484 break; 485 case BOOT_MEM_RESERVED: 486 default: 487 res->name = "reserved"; 488 } 489 490 res->start = start; 491 res->end = end; 492 493 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 494 request_resource(&iomem_resource, res); 495 496 /* 497 * We don't know which RAM region contains kernel data, 498 * so we try it repeatedly and let the resource manager 499 * test it. 500 */ 501 request_resource(res, &code_resource); 502 request_resource(res, &data_resource); 503 } 504 } 505 506 #undef PFN_UP 507 #undef PFN_DOWN 508 #undef PFN_PHYS 509 510 #undef MAXMEM 511 #undef MAXMEM_PFN 512 513 static int __initdata earlyinit_debug; 514 515 static int __init earlyinit_debug_setup(char *str) 516 { 517 earlyinit_debug = 1; 518 return 1; 519 } 520 __setup("earlyinit_debug", earlyinit_debug_setup); 521 522 extern initcall_t __earlyinitcall_start, __earlyinitcall_end; 523 524 static void __init do_earlyinitcalls(void) 525 { 526 initcall_t *call, *start, *end; 527 528 start = &__earlyinitcall_start; 529 end = &__earlyinitcall_end; 530 531 for (call = start; call < end; call++) { 532 if (earlyinit_debug) 533 printk("calling earlyinitcall 0x%p\n", *call); 534 535 (*call)(); 536 } 537 } 538 539 void __init setup_arch(char **cmdline_p) 540 { 541 cpu_probe(); 542 prom_init(); 543 cpu_report(); 544 545 #if defined(CONFIG_VT) 546 #if defined(CONFIG_VGA_CONSOLE) 547 conswitchp = &vga_con; 548 #elif defined(CONFIG_DUMMY_CONSOLE) 549 conswitchp = &dummy_con; 550 #endif 551 #endif 552 553 /* call board setup routine */ 554 do_earlyinitcalls(); 555 556 strlcpy(command_line, arcs_cmdline, sizeof(command_line)); 557 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); 558 559 *cmdline_p = command_line; 560 561 parse_cmdline_early(); 562 bootmem_init(); 563 sparse_init(); 564 paging_init(); 565 resource_init(); 566 } 567 568 int __init fpu_disable(char *s) 569 { 570 cpu_data[0].options &= ~MIPS_CPU_FPU; 571 572 return 1; 573 } 574 575 __setup("nofpu", fpu_disable); 576