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/cache.h> 41 #include <asm/cpu.h> 42 #include <asm/sections.h> 43 #include <asm/setup.h> 44 #include <asm/system.h> 45 46 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 47 48 EXPORT_SYMBOL(cpu_data); 49 50 #ifdef CONFIG_VT 51 struct screen_info screen_info; 52 #endif 53 54 /* 55 * Despite it's name this variable is even if we don't have PCI 56 */ 57 unsigned int PCI_DMA_BUS_IS_PHYS; 58 59 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); 60 61 /* 62 * Setup information 63 * 64 * These are initialized so they are in the .data section 65 */ 66 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; 67 unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN; 68 69 EXPORT_SYMBOL(mips_machtype); 70 EXPORT_SYMBOL(mips_machgroup); 71 72 struct boot_mem_map boot_mem_map; 73 74 static char command_line[CL_SIZE]; 75 char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; 76 77 /* 78 * mips_io_port_base is the begin of the address space to which x86 style 79 * I/O ports are mapped. 80 */ 81 const unsigned long mips_io_port_base __read_mostly = -1; 82 EXPORT_SYMBOL(mips_io_port_base); 83 84 /* 85 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped 86 * for the processor. 87 */ 88 unsigned long isa_slot_offset; 89 EXPORT_SYMBOL(isa_slot_offset); 90 91 static struct resource code_resource = { .name = "Kernel code", }; 92 static struct resource data_resource = { .name = "Kernel data", }; 93 94 void __init add_memory_region(phys_t start, phys_t size, long type) 95 { 96 int x = boot_mem_map.nr_map; 97 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; 98 99 /* 100 * Try to merge with previous entry if any. This is far less than 101 * perfect but is sufficient for most real world cases. 102 */ 103 if (x && prev->addr + prev->size == start && prev->type == type) { 104 prev->size += size; 105 return; 106 } 107 108 if (x == BOOT_MEM_MAP_MAX) { 109 printk("Ooops! Too many entries in the memory map!\n"); 110 return; 111 } 112 113 boot_mem_map.map[x].addr = start; 114 boot_mem_map.map[x].size = size; 115 boot_mem_map.map[x].type = type; 116 boot_mem_map.nr_map++; 117 } 118 119 static void __init print_memory_map(void) 120 { 121 int i; 122 const int field = 2 * sizeof(unsigned long); 123 124 for (i = 0; i < boot_mem_map.nr_map; i++) { 125 printk(" memory: %0*Lx @ %0*Lx ", 126 field, (unsigned long long) boot_mem_map.map[i].size, 127 field, (unsigned long long) boot_mem_map.map[i].addr); 128 129 switch (boot_mem_map.map[i].type) { 130 case BOOT_MEM_RAM: 131 printk("(usable)\n"); 132 break; 133 case BOOT_MEM_ROM_DATA: 134 printk("(ROM data)\n"); 135 break; 136 case BOOT_MEM_RESERVED: 137 printk("(reserved)\n"); 138 break; 139 default: 140 printk("type %lu\n", boot_mem_map.map[i].type); 141 break; 142 } 143 } 144 } 145 146 static inline void parse_cmdline_early(void) 147 { 148 char c = ' ', *to = command_line, *from = saved_command_line; 149 unsigned long start_at, mem_size; 150 int len = 0; 151 int usermem = 0; 152 153 printk("Determined physical RAM map:\n"); 154 print_memory_map(); 155 156 for (;;) { 157 /* 158 * "mem=XXX[kKmM]" defines a memory region from 159 * 0 to <XXX>, overriding the determined size. 160 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from 161 * <YYY> to <YYY>+<XXX>, overriding the determined size. 162 */ 163 if (c == ' ' && !memcmp(from, "mem=", 4)) { 164 if (to != command_line) 165 to--; 166 /* 167 * If a user specifies memory size, we 168 * blow away any automatically generated 169 * size. 170 */ 171 if (usermem == 0) { 172 boot_mem_map.nr_map = 0; 173 usermem = 1; 174 } 175 mem_size = memparse(from + 4, &from); 176 if (*from == '@') 177 start_at = memparse(from + 1, &from); 178 else 179 start_at = 0; 180 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 181 } 182 c = *(from++); 183 if (!c) 184 break; 185 if (CL_SIZE <= ++len) 186 break; 187 *(to++) = c; 188 } 189 *to = '\0'; 190 191 if (usermem) { 192 printk("User-defined physical RAM map:\n"); 193 print_memory_map(); 194 } 195 } 196 197 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end) 198 { 199 /* 200 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd 201 * "rd_size=0xNN" it's size 202 */ 203 unsigned long start = 0; 204 unsigned long size = 0; 205 unsigned long end; 206 char cmd_line[CL_SIZE]; 207 char *start_str; 208 char *size_str; 209 char *tmp; 210 211 strcpy(cmd_line, command_line); 212 *command_line = 0; 213 tmp = cmd_line; 214 /* Ignore "rd_start=" strings in other parameters. */ 215 start_str = strstr(cmd_line, "rd_start="); 216 if (start_str && start_str != cmd_line && *(start_str - 1) != ' ') 217 start_str = strstr(start_str, " rd_start="); 218 while (start_str) { 219 if (start_str != cmd_line) 220 strncat(command_line, tmp, start_str - tmp); 221 start = memparse(start_str + 9, &start_str); 222 tmp = start_str + 1; 223 start_str = strstr(start_str, " rd_start="); 224 } 225 if (*tmp) 226 strcat(command_line, tmp); 227 228 strcpy(cmd_line, command_line); 229 *command_line = 0; 230 tmp = cmd_line; 231 /* Ignore "rd_size" strings in other parameters. */ 232 size_str = strstr(cmd_line, "rd_size="); 233 if (size_str && size_str != cmd_line && *(size_str - 1) != ' ') 234 size_str = strstr(size_str, " rd_size="); 235 while (size_str) { 236 if (size_str != cmd_line) 237 strncat(command_line, tmp, size_str - tmp); 238 size = memparse(size_str + 8, &size_str); 239 tmp = size_str + 1; 240 size_str = strstr(size_str, " rd_size="); 241 } 242 if (*tmp) 243 strcat(command_line, tmp); 244 245 #ifdef CONFIG_64BIT 246 /* HACK: Guess if the sign extension was forgotten */ 247 if (start > 0x0000000080000000 && start < 0x00000000ffffffff) 248 start |= 0xffffffff00000000; 249 #endif 250 251 end = start + size; 252 if (start && end) { 253 *rd_start = start; 254 *rd_end = end; 255 return 1; 256 } 257 return 0; 258 } 259 260 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT) 261 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 262 #define PFN_PHYS(x) ((x) << PAGE_SHIFT) 263 264 #define MAXMEM HIGHMEM_START 265 #define MAXMEM_PFN PFN_DOWN(MAXMEM) 266 267 static inline void bootmem_init(void) 268 { 269 unsigned long start_pfn; 270 unsigned long reserved_end = (unsigned long)&_end; 271 #ifndef CONFIG_SGI_IP27 272 unsigned long first_usable_pfn; 273 unsigned long bootmap_size; 274 int i; 275 #endif 276 #ifdef CONFIG_BLK_DEV_INITRD 277 int initrd_reserve_bootmem = 0; 278 279 /* Board specific code should have set up initrd_start and initrd_end */ 280 ROOT_DEV = Root_RAM0; 281 if (parse_rd_cmdline(&initrd_start, &initrd_end)) { 282 reserved_end = max(reserved_end, initrd_end); 283 initrd_reserve_bootmem = 1; 284 } else { 285 unsigned long tmp; 286 u32 *initrd_header; 287 288 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2; 289 if (tmp < reserved_end) 290 tmp += PAGE_SIZE; 291 initrd_header = (u32 *)tmp; 292 if (initrd_header[0] == 0x494E5244) { 293 initrd_start = (unsigned long)&initrd_header[2]; 294 initrd_end = initrd_start + initrd_header[1]; 295 reserved_end = max(reserved_end, initrd_end); 296 initrd_reserve_bootmem = 1; 297 } 298 } 299 #endif /* CONFIG_BLK_DEV_INITRD */ 300 301 /* 302 * Partially used pages are not usable - thus 303 * we are rounding upwards. 304 */ 305 start_pfn = PFN_UP(CPHYSADDR(reserved_end)); 306 307 #ifndef CONFIG_SGI_IP27 308 /* Find the highest page frame number we have available. */ 309 max_pfn = 0; 310 first_usable_pfn = -1UL; 311 for (i = 0; i < boot_mem_map.nr_map; i++) { 312 unsigned long start, end; 313 314 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 315 continue; 316 317 start = PFN_UP(boot_mem_map.map[i].addr); 318 end = PFN_DOWN(boot_mem_map.map[i].addr 319 + boot_mem_map.map[i].size); 320 321 if (start >= end) 322 continue; 323 if (end > max_pfn) 324 max_pfn = end; 325 if (start < first_usable_pfn) { 326 if (start > start_pfn) { 327 first_usable_pfn = start; 328 } else if (end > start_pfn) { 329 first_usable_pfn = start_pfn; 330 } 331 } 332 } 333 334 /* 335 * Determine low and high memory ranges 336 */ 337 max_low_pfn = max_pfn; 338 if (max_low_pfn > MAXMEM_PFN) { 339 max_low_pfn = MAXMEM_PFN; 340 #ifndef CONFIG_HIGHMEM 341 /* Maximum memory usable is what is directly addressable */ 342 printk(KERN_WARNING "Warning only %ldMB will be used.\n", 343 MAXMEM >> 20); 344 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); 345 #endif 346 } 347 348 #ifdef CONFIG_HIGHMEM 349 /* 350 * Crude, we really should make a better attempt at detecting 351 * highstart_pfn 352 */ 353 highstart_pfn = highend_pfn = max_pfn; 354 if (max_pfn > MAXMEM_PFN) { 355 highstart_pfn = MAXMEM_PFN; 356 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 357 (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT)); 358 } 359 #endif 360 361 memory_present(0, first_usable_pfn, max_low_pfn); 362 363 /* Initialize the boot-time allocator with low memory only. */ 364 bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn); 365 366 /* 367 * Register fully available low RAM pages with the bootmem allocator. 368 */ 369 for (i = 0; i < boot_mem_map.nr_map; i++) { 370 unsigned long curr_pfn, last_pfn, size; 371 372 /* 373 * Reserve usable memory. 374 */ 375 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 376 continue; 377 378 /* 379 * We are rounding up the start address of usable memory: 380 */ 381 curr_pfn = PFN_UP(boot_mem_map.map[i].addr); 382 if (curr_pfn >= max_low_pfn) 383 continue; 384 if (curr_pfn < start_pfn) 385 curr_pfn = start_pfn; 386 387 /* 388 * ... and at the end of the usable range downwards: 389 */ 390 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr 391 + boot_mem_map.map[i].size); 392 393 if (last_pfn > max_low_pfn) 394 last_pfn = max_low_pfn; 395 396 /* 397 * Only register lowmem part of lowmem segment with bootmem. 398 */ 399 size = last_pfn - curr_pfn; 400 if (curr_pfn > PFN_DOWN(HIGHMEM_START)) 401 continue; 402 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START)) 403 size = PFN_DOWN(HIGHMEM_START) - curr_pfn; 404 if (!size) 405 continue; 406 407 /* 408 * ... finally, did all the rounding and playing 409 * around just make the area go away? 410 */ 411 if (last_pfn <= curr_pfn) 412 continue; 413 414 /* Register lowmem ranges */ 415 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); 416 } 417 418 /* Reserve the bootmap memory. */ 419 reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size); 420 #endif /* CONFIG_SGI_IP27 */ 421 422 #ifdef CONFIG_BLK_DEV_INITRD 423 initrd_below_start_ok = 1; 424 if (initrd_start) { 425 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start); 426 printk("Initial ramdisk at: 0x%p (%lu bytes)\n", 427 (void *)initrd_start, initrd_size); 428 429 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) { 430 printk("initrd extends beyond end of memory " 431 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n", 432 sizeof(long) * 2, 433 (unsigned long long)CPHYSADDR(initrd_end), 434 sizeof(long) * 2, 435 (unsigned long long)PFN_PHYS(max_low_pfn)); 436 initrd_start = initrd_end = 0; 437 initrd_reserve_bootmem = 0; 438 } 439 440 if (initrd_reserve_bootmem) 441 reserve_bootmem(CPHYSADDR(initrd_start), initrd_size); 442 } 443 #endif /* CONFIG_BLK_DEV_INITRD */ 444 } 445 446 static inline void resource_init(void) 447 { 448 int i; 449 450 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64) 451 /* 452 * The 64bit code in 32bit object format trick can't represent 453 * 64bit wide relocations for linker script symbols. 454 */ 455 code_resource.start = CPHYSADDR(&_text); 456 code_resource.end = CPHYSADDR(&_etext) - 1; 457 data_resource.start = CPHYSADDR(&_etext); 458 data_resource.end = CPHYSADDR(&_edata) - 1; 459 #else 460 code_resource.start = virt_to_phys(&_text); 461 code_resource.end = virt_to_phys(&_etext) - 1; 462 data_resource.start = virt_to_phys(&_etext); 463 data_resource.end = virt_to_phys(&_edata) - 1; 464 #endif 465 466 /* 467 * Request address space for all standard RAM. 468 */ 469 for (i = 0; i < boot_mem_map.nr_map; i++) { 470 struct resource *res; 471 unsigned long start, end; 472 473 start = boot_mem_map.map[i].addr; 474 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; 475 if (start >= MAXMEM) 476 continue; 477 if (end >= MAXMEM) 478 end = MAXMEM - 1; 479 480 res = alloc_bootmem(sizeof(struct resource)); 481 switch (boot_mem_map.map[i].type) { 482 case BOOT_MEM_RAM: 483 case BOOT_MEM_ROM_DATA: 484 res->name = "System RAM"; 485 break; 486 case BOOT_MEM_RESERVED: 487 default: 488 res->name = "reserved"; 489 } 490 491 res->start = start; 492 res->end = end; 493 494 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 495 request_resource(&iomem_resource, res); 496 497 /* 498 * We don't know which RAM region contains kernel data, 499 * so we try it repeatedly and let the resource manager 500 * test it. 501 */ 502 request_resource(res, &code_resource); 503 request_resource(res, &data_resource); 504 } 505 } 506 507 #undef PFN_UP 508 #undef PFN_DOWN 509 #undef PFN_PHYS 510 511 #undef MAXMEM 512 #undef MAXMEM_PFN 513 514 extern void plat_setup(void); 515 516 void __init setup_arch(char **cmdline_p) 517 { 518 cpu_probe(); 519 prom_init(); 520 cpu_report(); 521 522 #if defined(CONFIG_VT) 523 #if defined(CONFIG_VGA_CONSOLE) 524 conswitchp = &vga_con; 525 #elif defined(CONFIG_DUMMY_CONSOLE) 526 conswitchp = &dummy_con; 527 #endif 528 #endif 529 530 /* call board setup routine */ 531 plat_setup(); 532 533 strlcpy(command_line, arcs_cmdline, sizeof(command_line)); 534 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); 535 536 *cmdline_p = command_line; 537 538 parse_cmdline_early(); 539 bootmem_init(); 540 sparse_init(); 541 paging_init(); 542 resource_init(); 543 } 544 545 int __init fpu_disable(char *s) 546 { 547 cpu_data[0].options &= ~MIPS_CPU_FPU; 548 549 return 1; 550 } 551 552 __setup("nofpu", fpu_disable); 553 554 int __init dsp_disable(char *s) 555 { 556 cpu_data[0].ases &= ~MIPS_ASE_DSP; 557 558 return 1; 559 } 560 561 __setup("nodsp", dsp_disable); 562