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 #include <linux/pfn.h> 38 39 #include <asm/addrspace.h> 40 #include <asm/bootinfo.h> 41 #include <asm/cache.h> 42 #include <asm/cpu.h> 43 #include <asm/sections.h> 44 #include <asm/setup.h> 45 #include <asm/system.h> 46 47 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 48 49 EXPORT_SYMBOL(cpu_data); 50 51 #ifdef CONFIG_VT 52 struct screen_info screen_info; 53 #endif 54 55 /* 56 * Despite it's name this variable is even if we don't have PCI 57 */ 58 unsigned int PCI_DMA_BUS_IS_PHYS; 59 60 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); 61 62 /* 63 * Setup information 64 * 65 * These are initialized so they are in the .data section 66 */ 67 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; 68 unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN; 69 70 EXPORT_SYMBOL(mips_machtype); 71 EXPORT_SYMBOL(mips_machgroup); 72 73 struct boot_mem_map boot_mem_map; 74 75 static char command_line[CL_SIZE]; 76 char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; 77 78 /* 79 * mips_io_port_base is the begin of the address space to which x86 style 80 * I/O ports are mapped. 81 */ 82 const unsigned long mips_io_port_base __read_mostly = -1; 83 EXPORT_SYMBOL(mips_io_port_base); 84 85 /* 86 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped 87 * for the processor. 88 */ 89 unsigned long isa_slot_offset; 90 EXPORT_SYMBOL(isa_slot_offset); 91 92 static struct resource code_resource = { .name = "Kernel code", }; 93 static struct resource data_resource = { .name = "Kernel data", }; 94 95 void __init add_memory_region(phys_t start, phys_t size, long type) 96 { 97 int x = boot_mem_map.nr_map; 98 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; 99 100 /* 101 * Try to merge with previous entry if any. This is far less than 102 * perfect but is sufficient for most real world cases. 103 */ 104 if (x && prev->addr + prev->size == start && prev->type == type) { 105 prev->size += size; 106 return; 107 } 108 109 if (x == BOOT_MEM_MAP_MAX) { 110 printk("Ooops! Too many entries in the memory map!\n"); 111 return; 112 } 113 114 boot_mem_map.map[x].addr = start; 115 boot_mem_map.map[x].size = size; 116 boot_mem_map.map[x].type = type; 117 boot_mem_map.nr_map++; 118 } 119 120 static void __init print_memory_map(void) 121 { 122 int i; 123 const int field = 2 * sizeof(unsigned long); 124 125 for (i = 0; i < boot_mem_map.nr_map; i++) { 126 printk(" memory: %0*Lx @ %0*Lx ", 127 field, (unsigned long long) boot_mem_map.map[i].size, 128 field, (unsigned long long) boot_mem_map.map[i].addr); 129 130 switch (boot_mem_map.map[i].type) { 131 case BOOT_MEM_RAM: 132 printk("(usable)\n"); 133 break; 134 case BOOT_MEM_ROM_DATA: 135 printk("(ROM data)\n"); 136 break; 137 case BOOT_MEM_RESERVED: 138 printk("(reserved)\n"); 139 break; 140 default: 141 printk("type %lu\n", boot_mem_map.map[i].type); 142 break; 143 } 144 } 145 } 146 147 static inline void parse_cmdline_early(void) 148 { 149 char c = ' ', *to = command_line, *from = saved_command_line; 150 unsigned long start_at, mem_size; 151 int len = 0; 152 int usermem = 0; 153 154 printk("Determined physical RAM map:\n"); 155 print_memory_map(); 156 157 for (;;) { 158 /* 159 * "mem=XXX[kKmM]" defines a memory region from 160 * 0 to <XXX>, overriding the determined size. 161 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from 162 * <YYY> to <YYY>+<XXX>, overriding the determined size. 163 */ 164 if (c == ' ' && !memcmp(from, "mem=", 4)) { 165 if (to != command_line) 166 to--; 167 /* 168 * If a user specifies memory size, we 169 * blow away any automatically generated 170 * size. 171 */ 172 if (usermem == 0) { 173 boot_mem_map.nr_map = 0; 174 usermem = 1; 175 } 176 mem_size = memparse(from + 4, &from); 177 if (*from == '@') 178 start_at = memparse(from + 1, &from); 179 else 180 start_at = 0; 181 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 182 } 183 c = *(from++); 184 if (!c) 185 break; 186 if (CL_SIZE <= ++len) 187 break; 188 *(to++) = c; 189 } 190 *to = '\0'; 191 192 if (usermem) { 193 printk("User-defined physical RAM map:\n"); 194 print_memory_map(); 195 } 196 } 197 198 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end) 199 { 200 /* 201 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd 202 * "rd_size=0xNN" it's size 203 */ 204 unsigned long start = 0; 205 unsigned long size = 0; 206 unsigned long end; 207 char cmd_line[CL_SIZE]; 208 char *start_str; 209 char *size_str; 210 char *tmp; 211 212 strcpy(cmd_line, command_line); 213 *command_line = 0; 214 tmp = cmd_line; 215 /* Ignore "rd_start=" strings in other parameters. */ 216 start_str = strstr(cmd_line, "rd_start="); 217 if (start_str && start_str != cmd_line && *(start_str - 1) != ' ') 218 start_str = strstr(start_str, " rd_start="); 219 while (start_str) { 220 if (start_str != cmd_line) 221 strncat(command_line, tmp, start_str - tmp); 222 start = memparse(start_str + 9, &start_str); 223 tmp = start_str + 1; 224 start_str = strstr(start_str, " rd_start="); 225 } 226 if (*tmp) 227 strcat(command_line, tmp); 228 229 strcpy(cmd_line, command_line); 230 *command_line = 0; 231 tmp = cmd_line; 232 /* Ignore "rd_size" strings in other parameters. */ 233 size_str = strstr(cmd_line, "rd_size="); 234 if (size_str && size_str != cmd_line && *(size_str - 1) != ' ') 235 size_str = strstr(size_str, " rd_size="); 236 while (size_str) { 237 if (size_str != cmd_line) 238 strncat(command_line, tmp, size_str - tmp); 239 size = memparse(size_str + 8, &size_str); 240 tmp = size_str + 1; 241 size_str = strstr(size_str, " rd_size="); 242 } 243 if (*tmp) 244 strcat(command_line, tmp); 245 246 #ifdef CONFIG_64BIT 247 /* HACK: Guess if the sign extension was forgotten */ 248 if (start > 0x0000000080000000 && start < 0x00000000ffffffff) 249 start |= 0xffffffff00000000; 250 #endif 251 252 end = start + size; 253 if (start && end) { 254 *rd_start = start; 255 *rd_end = end; 256 return 1; 257 } 258 return 0; 259 } 260 261 #define MAXMEM HIGHMEM_START 262 #define MAXMEM_PFN PFN_DOWN(MAXMEM) 263 264 static inline void bootmem_init(void) 265 { 266 unsigned long start_pfn; 267 unsigned long reserved_end = (unsigned long)&_end; 268 #ifndef CONFIG_SGI_IP27 269 unsigned long first_usable_pfn; 270 unsigned long bootmap_size; 271 int i; 272 #endif 273 #ifdef CONFIG_BLK_DEV_INITRD 274 int initrd_reserve_bootmem = 0; 275 276 /* Board specific code should have set up initrd_start and initrd_end */ 277 ROOT_DEV = Root_RAM0; 278 if (parse_rd_cmdline(&initrd_start, &initrd_end)) { 279 reserved_end = max(reserved_end, initrd_end); 280 initrd_reserve_bootmem = 1; 281 } else { 282 unsigned long tmp; 283 u32 *initrd_header; 284 285 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2; 286 if (tmp < reserved_end) 287 tmp += PAGE_SIZE; 288 initrd_header = (u32 *)tmp; 289 if (initrd_header[0] == 0x494E5244) { 290 initrd_start = (unsigned long)&initrd_header[2]; 291 initrd_end = initrd_start + initrd_header[1]; 292 reserved_end = max(reserved_end, initrd_end); 293 initrd_reserve_bootmem = 1; 294 } 295 } 296 #endif /* CONFIG_BLK_DEV_INITRD */ 297 298 /* 299 * Partially used pages are not usable - thus 300 * we are rounding upwards. 301 */ 302 start_pfn = PFN_UP(CPHYSADDR(reserved_end)); 303 304 #ifndef CONFIG_SGI_IP27 305 /* Find the highest page frame number we have available. */ 306 max_pfn = 0; 307 first_usable_pfn = -1UL; 308 for (i = 0; i < boot_mem_map.nr_map; i++) { 309 unsigned long start, end; 310 311 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 312 continue; 313 314 start = PFN_UP(boot_mem_map.map[i].addr); 315 end = PFN_DOWN(boot_mem_map.map[i].addr 316 + boot_mem_map.map[i].size); 317 318 if (start >= end) 319 continue; 320 if (end > max_pfn) 321 max_pfn = end; 322 if (start < first_usable_pfn) { 323 if (start > start_pfn) { 324 first_usable_pfn = start; 325 } else if (end > start_pfn) { 326 first_usable_pfn = start_pfn; 327 } 328 } 329 } 330 331 /* 332 * Determine low and high memory ranges 333 */ 334 max_low_pfn = max_pfn; 335 if (max_low_pfn > MAXMEM_PFN) { 336 max_low_pfn = MAXMEM_PFN; 337 #ifndef CONFIG_HIGHMEM 338 /* Maximum memory usable is what is directly addressable */ 339 printk(KERN_WARNING "Warning only %ldMB will be used.\n", 340 MAXMEM >> 20); 341 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); 342 #endif 343 } 344 345 #ifdef CONFIG_HIGHMEM 346 /* 347 * Crude, we really should make a better attempt at detecting 348 * highstart_pfn 349 */ 350 highstart_pfn = highend_pfn = max_pfn; 351 if (max_pfn > MAXMEM_PFN) { 352 highstart_pfn = MAXMEM_PFN; 353 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 354 (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT)); 355 } 356 #endif 357 358 memory_present(0, first_usable_pfn, max_low_pfn); 359 360 /* Initialize the boot-time allocator with low memory only. */ 361 bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn); 362 363 /* 364 * Register fully available low RAM pages with the bootmem allocator. 365 */ 366 for (i = 0; i < boot_mem_map.nr_map; i++) { 367 unsigned long curr_pfn, last_pfn, size; 368 369 /* 370 * Reserve usable memory. 371 */ 372 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 373 continue; 374 375 /* 376 * We are rounding up the start address of usable memory: 377 */ 378 curr_pfn = PFN_UP(boot_mem_map.map[i].addr); 379 if (curr_pfn >= max_low_pfn) 380 continue; 381 if (curr_pfn < start_pfn) 382 curr_pfn = start_pfn; 383 384 /* 385 * ... and at the end of the usable range downwards: 386 */ 387 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr 388 + boot_mem_map.map[i].size); 389 390 if (last_pfn > max_low_pfn) 391 last_pfn = max_low_pfn; 392 393 /* 394 * Only register lowmem part of lowmem segment with bootmem. 395 */ 396 size = last_pfn - curr_pfn; 397 if (curr_pfn > PFN_DOWN(HIGHMEM_START)) 398 continue; 399 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START)) 400 size = PFN_DOWN(HIGHMEM_START) - curr_pfn; 401 if (!size) 402 continue; 403 404 /* 405 * ... finally, did all the rounding and playing 406 * around just make the area go away? 407 */ 408 if (last_pfn <= curr_pfn) 409 continue; 410 411 /* Register lowmem ranges */ 412 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); 413 } 414 415 /* Reserve the bootmap memory. */ 416 reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size); 417 #endif /* CONFIG_SGI_IP27 */ 418 419 #ifdef CONFIG_BLK_DEV_INITRD 420 initrd_below_start_ok = 1; 421 if (initrd_start) { 422 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start); 423 printk("Initial ramdisk at: 0x%p (%lu bytes)\n", 424 (void *)initrd_start, initrd_size); 425 426 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) { 427 printk("initrd extends beyond end of memory " 428 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n", 429 sizeof(long) * 2, 430 (unsigned long long)CPHYSADDR(initrd_end), 431 sizeof(long) * 2, 432 (unsigned long long)PFN_PHYS(max_low_pfn)); 433 initrd_start = initrd_end = 0; 434 initrd_reserve_bootmem = 0; 435 } 436 437 if (initrd_reserve_bootmem) 438 reserve_bootmem(CPHYSADDR(initrd_start), initrd_size); 439 } 440 #endif /* CONFIG_BLK_DEV_INITRD */ 441 } 442 443 static inline void resource_init(void) 444 { 445 int i; 446 447 code_resource.start = virt_to_phys(&_text); 448 code_resource.end = virt_to_phys(&_etext) - 1; 449 data_resource.start = virt_to_phys(&_etext); 450 data_resource.end = virt_to_phys(&_edata) - 1; 451 452 /* 453 * Request address space for all standard RAM. 454 */ 455 for (i = 0; i < boot_mem_map.nr_map; i++) { 456 struct resource *res; 457 unsigned long start, end; 458 459 start = boot_mem_map.map[i].addr; 460 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; 461 if (start >= MAXMEM) 462 continue; 463 if (end >= MAXMEM) 464 end = MAXMEM - 1; 465 466 res = alloc_bootmem(sizeof(struct resource)); 467 switch (boot_mem_map.map[i].type) { 468 case BOOT_MEM_RAM: 469 case BOOT_MEM_ROM_DATA: 470 res->name = "System RAM"; 471 break; 472 case BOOT_MEM_RESERVED: 473 default: 474 res->name = "reserved"; 475 } 476 477 res->start = start; 478 res->end = end; 479 480 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 481 request_resource(&iomem_resource, res); 482 483 /* 484 * We don't know which RAM region contains kernel data, 485 * so we try it repeatedly and let the resource manager 486 * test it. 487 */ 488 request_resource(res, &code_resource); 489 request_resource(res, &data_resource); 490 } 491 } 492 493 #undef MAXMEM 494 #undef MAXMEM_PFN 495 496 extern void plat_setup(void); 497 498 void __init setup_arch(char **cmdline_p) 499 { 500 cpu_probe(); 501 prom_init(); 502 cpu_report(); 503 504 #if defined(CONFIG_VT) 505 #if defined(CONFIG_VGA_CONSOLE) 506 conswitchp = &vga_con; 507 #elif defined(CONFIG_DUMMY_CONSOLE) 508 conswitchp = &dummy_con; 509 #endif 510 #endif 511 512 /* call board setup routine */ 513 plat_setup(); 514 515 strlcpy(command_line, arcs_cmdline, sizeof(command_line)); 516 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); 517 518 *cmdline_p = command_line; 519 520 parse_cmdline_early(); 521 bootmem_init(); 522 sparse_init(); 523 paging_init(); 524 resource_init(); 525 #ifdef CONFIG_SMP 526 plat_smp_setup(); 527 #endif 528 } 529 530 int __init fpu_disable(char *s) 531 { 532 int i; 533 534 for (i = 0; i < NR_CPUS; i++) 535 cpu_data[i].options &= ~MIPS_CPU_FPU; 536 537 return 1; 538 } 539 540 __setup("nofpu", fpu_disable); 541 542 int __init dsp_disable(char *s) 543 { 544 cpu_data[0].ases &= ~MIPS_ASE_DSP; 545 546 return 1; 547 } 548 549 __setup("nodsp", dsp_disable); 550