bibo,mao | 269c2d8 | 2006-12-07 02:14:06 +0100 | [diff] [blame] | 1 | #include <linux/kernel.h> |
| 2 | #include <linux/types.h> |
| 3 | #include <linux/init.h> |
| 4 | #include <linux/bootmem.h> |
| 5 | #include <linux/ioport.h> |
| 6 | #include <linux/string.h> |
| 7 | #include <linux/kexec.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/mm.h> |
| 10 | #include <linux/efi.h> |
bibo,mao | b2dff6a | 2006-12-07 02:14:06 +0100 | [diff] [blame^] | 11 | #include <linux/pfn.h> |
bibo,mao | 269c2d8 | 2006-12-07 02:14:06 +0100 | [diff] [blame] | 12 | |
| 13 | #include <asm/pgtable.h> |
| 14 | #include <asm/page.h> |
| 15 | #include <asm/e820.h> |
| 16 | |
| 17 | #ifdef CONFIG_EFI |
| 18 | int efi_enabled = 0; |
| 19 | EXPORT_SYMBOL(efi_enabled); |
| 20 | #endif |
| 21 | |
| 22 | struct e820map e820; |
bibo,mao | 8e3342f | 2006-12-07 02:14:06 +0100 | [diff] [blame] | 23 | struct change_member { |
| 24 | struct e820entry *pbios; /* pointer to original bios entry */ |
| 25 | unsigned long long addr; /* address for this change point */ |
| 26 | }; |
| 27 | static struct change_member change_point_list[2*E820MAX] __initdata; |
| 28 | static struct change_member *change_point[2*E820MAX] __initdata; |
| 29 | static struct e820entry *overlap_list[E820MAX] __initdata; |
| 30 | static struct e820entry new_bios[E820MAX] __initdata; |
bibo,mao | 269c2d8 | 2006-12-07 02:14:06 +0100 | [diff] [blame] | 31 | struct resource data_resource = { |
| 32 | .name = "Kernel data", |
| 33 | .start = 0, |
| 34 | .end = 0, |
| 35 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM |
| 36 | }; |
| 37 | |
| 38 | struct resource code_resource = { |
| 39 | .name = "Kernel code", |
| 40 | .start = 0, |
| 41 | .end = 0, |
| 42 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM |
| 43 | }; |
| 44 | |
| 45 | static struct resource system_rom_resource = { |
| 46 | .name = "System ROM", |
| 47 | .start = 0xf0000, |
| 48 | .end = 0xfffff, |
| 49 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 50 | }; |
| 51 | |
| 52 | static struct resource extension_rom_resource = { |
| 53 | .name = "Extension ROM", |
| 54 | .start = 0xe0000, |
| 55 | .end = 0xeffff, |
| 56 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 57 | }; |
| 58 | |
| 59 | static struct resource adapter_rom_resources[] = { { |
| 60 | .name = "Adapter ROM", |
| 61 | .start = 0xc8000, |
| 62 | .end = 0, |
| 63 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 64 | }, { |
| 65 | .name = "Adapter ROM", |
| 66 | .start = 0, |
| 67 | .end = 0, |
| 68 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 69 | }, { |
| 70 | .name = "Adapter ROM", |
| 71 | .start = 0, |
| 72 | .end = 0, |
| 73 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 74 | }, { |
| 75 | .name = "Adapter ROM", |
| 76 | .start = 0, |
| 77 | .end = 0, |
| 78 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 79 | }, { |
| 80 | .name = "Adapter ROM", |
| 81 | .start = 0, |
| 82 | .end = 0, |
| 83 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 84 | }, { |
| 85 | .name = "Adapter ROM", |
| 86 | .start = 0, |
| 87 | .end = 0, |
| 88 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 89 | } }; |
| 90 | |
| 91 | static struct resource video_rom_resource = { |
| 92 | .name = "Video ROM", |
| 93 | .start = 0xc0000, |
| 94 | .end = 0xc7fff, |
| 95 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM |
| 96 | }; |
| 97 | |
| 98 | static struct resource video_ram_resource = { |
| 99 | .name = "Video RAM area", |
| 100 | .start = 0xa0000, |
| 101 | .end = 0xbffff, |
| 102 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM |
| 103 | }; |
| 104 | |
| 105 | static struct resource standard_io_resources[] = { { |
| 106 | .name = "dma1", |
| 107 | .start = 0x0000, |
| 108 | .end = 0x001f, |
| 109 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 110 | }, { |
| 111 | .name = "pic1", |
| 112 | .start = 0x0020, |
| 113 | .end = 0x0021, |
| 114 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 115 | }, { |
| 116 | .name = "timer0", |
| 117 | .start = 0x0040, |
| 118 | .end = 0x0043, |
| 119 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 120 | }, { |
| 121 | .name = "timer1", |
| 122 | .start = 0x0050, |
| 123 | .end = 0x0053, |
| 124 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 125 | }, { |
| 126 | .name = "keyboard", |
| 127 | .start = 0x0060, |
| 128 | .end = 0x006f, |
| 129 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 130 | }, { |
| 131 | .name = "dma page reg", |
| 132 | .start = 0x0080, |
| 133 | .end = 0x008f, |
| 134 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 135 | }, { |
| 136 | .name = "pic2", |
| 137 | .start = 0x00a0, |
| 138 | .end = 0x00a1, |
| 139 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 140 | }, { |
| 141 | .name = "dma2", |
| 142 | .start = 0x00c0, |
| 143 | .end = 0x00df, |
| 144 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 145 | }, { |
| 146 | .name = "fpu", |
| 147 | .start = 0x00f0, |
| 148 | .end = 0x00ff, |
| 149 | .flags = IORESOURCE_BUSY | IORESOURCE_IO |
| 150 | } }; |
| 151 | |
| 152 | #define romsignature(x) (*(unsigned short *)(x) == 0xaa55) |
| 153 | |
| 154 | static int __init romchecksum(unsigned char *rom, unsigned long length) |
| 155 | { |
| 156 | unsigned char *p, sum = 0; |
| 157 | |
| 158 | for (p = rom; p < rom + length; p++) |
| 159 | sum += *p; |
| 160 | return sum == 0; |
| 161 | } |
| 162 | |
| 163 | static void __init probe_roms(void) |
| 164 | { |
| 165 | unsigned long start, length, upper; |
| 166 | unsigned char *rom; |
| 167 | int i; |
| 168 | |
| 169 | /* video rom */ |
| 170 | upper = adapter_rom_resources[0].start; |
| 171 | for (start = video_rom_resource.start; start < upper; start += 2048) { |
| 172 | rom = isa_bus_to_virt(start); |
| 173 | if (!romsignature(rom)) |
| 174 | continue; |
| 175 | |
| 176 | video_rom_resource.start = start; |
| 177 | |
| 178 | /* 0 < length <= 0x7f * 512, historically */ |
| 179 | length = rom[2] * 512; |
| 180 | |
| 181 | /* if checksum okay, trust length byte */ |
| 182 | if (length && romchecksum(rom, length)) |
| 183 | video_rom_resource.end = start + length - 1; |
| 184 | |
| 185 | request_resource(&iomem_resource, &video_rom_resource); |
| 186 | break; |
| 187 | } |
| 188 | |
| 189 | start = (video_rom_resource.end + 1 + 2047) & ~2047UL; |
| 190 | if (start < upper) |
| 191 | start = upper; |
| 192 | |
| 193 | /* system rom */ |
| 194 | request_resource(&iomem_resource, &system_rom_resource); |
| 195 | upper = system_rom_resource.start; |
| 196 | |
| 197 | /* check for extension rom (ignore length byte!) */ |
| 198 | rom = isa_bus_to_virt(extension_rom_resource.start); |
| 199 | if (romsignature(rom)) { |
| 200 | length = extension_rom_resource.end - extension_rom_resource.start + 1; |
| 201 | if (romchecksum(rom, length)) { |
| 202 | request_resource(&iomem_resource, &extension_rom_resource); |
| 203 | upper = extension_rom_resource.start; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | /* check for adapter roms on 2k boundaries */ |
| 208 | for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) { |
| 209 | rom = isa_bus_to_virt(start); |
| 210 | if (!romsignature(rom)) |
| 211 | continue; |
| 212 | |
| 213 | /* 0 < length <= 0x7f * 512, historically */ |
| 214 | length = rom[2] * 512; |
| 215 | |
| 216 | /* but accept any length that fits if checksum okay */ |
| 217 | if (!length || start + length > upper || !romchecksum(rom, length)) |
| 218 | continue; |
| 219 | |
| 220 | adapter_rom_resources[i].start = start; |
| 221 | adapter_rom_resources[i].end = start + length - 1; |
| 222 | request_resource(&iomem_resource, &adapter_rom_resources[i]); |
| 223 | |
| 224 | start = adapter_rom_resources[i++].end & ~2047UL; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Request address space for all standard RAM and ROM resources |
| 230 | * and also for regions reported as reserved by the e820. |
| 231 | */ |
| 232 | static void __init |
| 233 | legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource) |
| 234 | { |
| 235 | int i; |
| 236 | |
| 237 | probe_roms(); |
| 238 | for (i = 0; i < e820.nr_map; i++) { |
| 239 | struct resource *res; |
| 240 | #ifndef CONFIG_RESOURCES_64BIT |
| 241 | if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL) |
| 242 | continue; |
| 243 | #endif |
| 244 | res = kzalloc(sizeof(struct resource), GFP_ATOMIC); |
| 245 | switch (e820.map[i].type) { |
| 246 | case E820_RAM: res->name = "System RAM"; break; |
| 247 | case E820_ACPI: res->name = "ACPI Tables"; break; |
| 248 | case E820_NVS: res->name = "ACPI Non-volatile Storage"; break; |
| 249 | default: res->name = "reserved"; |
| 250 | } |
| 251 | res->start = e820.map[i].addr; |
| 252 | res->end = res->start + e820.map[i].size - 1; |
| 253 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
| 254 | if (request_resource(&iomem_resource, res)) { |
| 255 | kfree(res); |
| 256 | continue; |
| 257 | } |
| 258 | if (e820.map[i].type == E820_RAM) { |
| 259 | /* |
| 260 | * We don't know which RAM region contains kernel data, |
| 261 | * so we try it repeatedly and let the resource manager |
| 262 | * test it. |
| 263 | */ |
| 264 | request_resource(res, code_resource); |
| 265 | request_resource(res, data_resource); |
| 266 | #ifdef CONFIG_KEXEC |
| 267 | request_resource(res, &crashk_res); |
| 268 | #endif |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Request address space for all standard resources |
| 275 | * |
| 276 | * This is called just before pcibios_init(), which is also a |
| 277 | * subsys_initcall, but is linked in later (in arch/i386/pci/common.c). |
| 278 | */ |
| 279 | static int __init request_standard_resources(void) |
| 280 | { |
| 281 | int i; |
| 282 | |
| 283 | printk("Setting up standard PCI resources\n"); |
| 284 | if (efi_enabled) |
| 285 | efi_initialize_iomem_resources(&code_resource, &data_resource); |
| 286 | else |
| 287 | legacy_init_iomem_resources(&code_resource, &data_resource); |
| 288 | |
| 289 | /* EFI systems may still have VGA */ |
| 290 | request_resource(&iomem_resource, &video_ram_resource); |
| 291 | |
| 292 | /* request I/O space for devices used on all i[345]86 PCs */ |
| 293 | for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) |
| 294 | request_resource(&ioport_resource, &standard_io_resources[i]); |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | subsys_initcall(request_standard_resources); |
bibo,mao | 8e3342f | 2006-12-07 02:14:06 +0100 | [diff] [blame] | 299 | |
| 300 | void __init add_memory_region(unsigned long long start, |
| 301 | unsigned long long size, int type) |
| 302 | { |
| 303 | int x; |
| 304 | |
| 305 | if (!efi_enabled) { |
| 306 | x = e820.nr_map; |
| 307 | |
| 308 | if (x == E820MAX) { |
| 309 | printk(KERN_ERR "Ooops! Too many entries in the memory map!\n"); |
| 310 | return; |
| 311 | } |
| 312 | |
| 313 | e820.map[x].addr = start; |
| 314 | e820.map[x].size = size; |
| 315 | e820.map[x].type = type; |
| 316 | e820.nr_map++; |
| 317 | } |
| 318 | } /* add_memory_region */ |
| 319 | |
| 320 | /* |
| 321 | * Sanitize the BIOS e820 map. |
| 322 | * |
| 323 | * Some e820 responses include overlapping entries. The following |
| 324 | * replaces the original e820 map with a new one, removing overlaps. |
| 325 | * |
| 326 | */ |
| 327 | int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map) |
| 328 | { |
| 329 | struct change_member *change_tmp; |
| 330 | unsigned long current_type, last_type; |
| 331 | unsigned long long last_addr; |
| 332 | int chgidx, still_changing; |
| 333 | int overlap_entries; |
| 334 | int new_bios_entry; |
| 335 | int old_nr, new_nr, chg_nr; |
| 336 | int i; |
| 337 | |
| 338 | /* |
| 339 | Visually we're performing the following (1,2,3,4 = memory types)... |
| 340 | |
| 341 | Sample memory map (w/overlaps): |
| 342 | ____22__________________ |
| 343 | ______________________4_ |
| 344 | ____1111________________ |
| 345 | _44_____________________ |
| 346 | 11111111________________ |
| 347 | ____________________33__ |
| 348 | ___________44___________ |
| 349 | __________33333_________ |
| 350 | ______________22________ |
| 351 | ___________________2222_ |
| 352 | _________111111111______ |
| 353 | _____________________11_ |
| 354 | _________________4______ |
| 355 | |
| 356 | Sanitized equivalent (no overlap): |
| 357 | 1_______________________ |
| 358 | _44_____________________ |
| 359 | ___1____________________ |
| 360 | ____22__________________ |
| 361 | ______11________________ |
| 362 | _________1______________ |
| 363 | __________3_____________ |
| 364 | ___________44___________ |
| 365 | _____________33_________ |
| 366 | _______________2________ |
| 367 | ________________1_______ |
| 368 | _________________4______ |
| 369 | ___________________2____ |
| 370 | ____________________33__ |
| 371 | ______________________4_ |
| 372 | */ |
| 373 | printk("sanitize start\n"); |
| 374 | /* if there's only one memory region, don't bother */ |
| 375 | if (*pnr_map < 2) { |
| 376 | printk("sanitize bail 0\n"); |
| 377 | return -1; |
| 378 | } |
| 379 | |
| 380 | old_nr = *pnr_map; |
| 381 | |
| 382 | /* bail out if we find any unreasonable addresses in bios map */ |
| 383 | for (i=0; i<old_nr; i++) |
| 384 | if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) { |
| 385 | printk("sanitize bail 1\n"); |
| 386 | return -1; |
| 387 | } |
| 388 | |
| 389 | /* create pointers for initial change-point information (for sorting) */ |
| 390 | for (i=0; i < 2*old_nr; i++) |
| 391 | change_point[i] = &change_point_list[i]; |
| 392 | |
| 393 | /* record all known change-points (starting and ending addresses), |
| 394 | omitting those that are for empty memory regions */ |
| 395 | chgidx = 0; |
| 396 | for (i=0; i < old_nr; i++) { |
| 397 | if (biosmap[i].size != 0) { |
| 398 | change_point[chgidx]->addr = biosmap[i].addr; |
| 399 | change_point[chgidx++]->pbios = &biosmap[i]; |
| 400 | change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size; |
| 401 | change_point[chgidx++]->pbios = &biosmap[i]; |
| 402 | } |
| 403 | } |
| 404 | chg_nr = chgidx; /* true number of change-points */ |
| 405 | |
| 406 | /* sort change-point list by memory addresses (low -> high) */ |
| 407 | still_changing = 1; |
| 408 | while (still_changing) { |
| 409 | still_changing = 0; |
| 410 | for (i=1; i < chg_nr; i++) { |
| 411 | /* if <current_addr> > <last_addr>, swap */ |
| 412 | /* or, if current=<start_addr> & last=<end_addr>, swap */ |
| 413 | if ((change_point[i]->addr < change_point[i-1]->addr) || |
| 414 | ((change_point[i]->addr == change_point[i-1]->addr) && |
| 415 | (change_point[i]->addr == change_point[i]->pbios->addr) && |
| 416 | (change_point[i-1]->addr != change_point[i-1]->pbios->addr)) |
| 417 | ) |
| 418 | { |
| 419 | change_tmp = change_point[i]; |
| 420 | change_point[i] = change_point[i-1]; |
| 421 | change_point[i-1] = change_tmp; |
| 422 | still_changing=1; |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | /* create a new bios memory map, removing overlaps */ |
| 428 | overlap_entries=0; /* number of entries in the overlap table */ |
| 429 | new_bios_entry=0; /* index for creating new bios map entries */ |
| 430 | last_type = 0; /* start with undefined memory type */ |
| 431 | last_addr = 0; /* start with 0 as last starting address */ |
| 432 | /* loop through change-points, determining affect on the new bios map */ |
| 433 | for (chgidx=0; chgidx < chg_nr; chgidx++) |
| 434 | { |
| 435 | /* keep track of all overlapping bios entries */ |
| 436 | if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr) |
| 437 | { |
| 438 | /* add map entry to overlap list (> 1 entry implies an overlap) */ |
| 439 | overlap_list[overlap_entries++]=change_point[chgidx]->pbios; |
| 440 | } |
| 441 | else |
| 442 | { |
| 443 | /* remove entry from list (order independent, so swap with last) */ |
| 444 | for (i=0; i<overlap_entries; i++) |
| 445 | { |
| 446 | if (overlap_list[i] == change_point[chgidx]->pbios) |
| 447 | overlap_list[i] = overlap_list[overlap_entries-1]; |
| 448 | } |
| 449 | overlap_entries--; |
| 450 | } |
| 451 | /* if there are overlapping entries, decide which "type" to use */ |
| 452 | /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */ |
| 453 | current_type = 0; |
| 454 | for (i=0; i<overlap_entries; i++) |
| 455 | if (overlap_list[i]->type > current_type) |
| 456 | current_type = overlap_list[i]->type; |
| 457 | /* continue building up new bios map based on this information */ |
| 458 | if (current_type != last_type) { |
| 459 | if (last_type != 0) { |
| 460 | new_bios[new_bios_entry].size = |
| 461 | change_point[chgidx]->addr - last_addr; |
| 462 | /* move forward only if the new size was non-zero */ |
| 463 | if (new_bios[new_bios_entry].size != 0) |
| 464 | if (++new_bios_entry >= E820MAX) |
| 465 | break; /* no more space left for new bios entries */ |
| 466 | } |
| 467 | if (current_type != 0) { |
| 468 | new_bios[new_bios_entry].addr = change_point[chgidx]->addr; |
| 469 | new_bios[new_bios_entry].type = current_type; |
| 470 | last_addr=change_point[chgidx]->addr; |
| 471 | } |
| 472 | last_type = current_type; |
| 473 | } |
| 474 | } |
| 475 | new_nr = new_bios_entry; /* retain count for new bios entries */ |
| 476 | |
| 477 | /* copy new bios mapping into original location */ |
| 478 | memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry)); |
| 479 | *pnr_map = new_nr; |
| 480 | |
| 481 | printk("sanitize end\n"); |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Copy the BIOS e820 map into a safe place. |
| 487 | * |
| 488 | * Sanity-check it while we're at it.. |
| 489 | * |
| 490 | * If we're lucky and live on a modern system, the setup code |
| 491 | * will have given us a memory map that we can use to properly |
| 492 | * set up memory. If we aren't, we'll fake a memory map. |
| 493 | * |
| 494 | * We check to see that the memory map contains at least 2 elements |
| 495 | * before we'll use it, because the detection code in setup.S may |
| 496 | * not be perfect and most every PC known to man has two memory |
| 497 | * regions: one from 0 to 640k, and one from 1mb up. (The IBM |
| 498 | * thinkpad 560x, for example, does not cooperate with the memory |
| 499 | * detection code.) |
| 500 | */ |
| 501 | int __init copy_e820_map(struct e820entry * biosmap, int nr_map) |
| 502 | { |
| 503 | /* Only one memory region (or negative)? Ignore it */ |
| 504 | if (nr_map < 2) |
| 505 | return -1; |
| 506 | |
| 507 | do { |
| 508 | unsigned long long start = biosmap->addr; |
| 509 | unsigned long long size = biosmap->size; |
| 510 | unsigned long long end = start + size; |
| 511 | unsigned long type = biosmap->type; |
| 512 | printk("copy_e820_map() start: %016Lx size: %016Lx end: %016Lx type: %ld\n", start, size, end, type); |
| 513 | |
| 514 | /* Overflow in 64 bits? Ignore the memory map. */ |
| 515 | if (start > end) |
| 516 | return -1; |
| 517 | |
| 518 | /* |
| 519 | * Some BIOSes claim RAM in the 640k - 1M region. |
| 520 | * Not right. Fix it up. |
| 521 | */ |
| 522 | if (type == E820_RAM) { |
| 523 | printk("copy_e820_map() type is E820_RAM\n"); |
| 524 | if (start < 0x100000ULL && end > 0xA0000ULL) { |
| 525 | printk("copy_e820_map() lies in range...\n"); |
| 526 | if (start < 0xA0000ULL) { |
| 527 | printk("copy_e820_map() start < 0xA0000ULL\n"); |
| 528 | add_memory_region(start, 0xA0000ULL-start, type); |
| 529 | } |
| 530 | if (end <= 0x100000ULL) { |
| 531 | printk("copy_e820_map() end <= 0x100000ULL\n"); |
| 532 | continue; |
| 533 | } |
| 534 | start = 0x100000ULL; |
| 535 | size = end - start; |
| 536 | } |
| 537 | } |
| 538 | add_memory_region(start, size, type); |
| 539 | } while (biosmap++,--nr_map); |
| 540 | return 0; |
| 541 | } |
| 542 | |
bibo,mao | b2dff6a | 2006-12-07 02:14:06 +0100 | [diff] [blame^] | 543 | /* |
| 544 | * Callback for efi_memory_walk. |
| 545 | */ |
| 546 | static int __init |
| 547 | efi_find_max_pfn(unsigned long start, unsigned long end, void *arg) |
| 548 | { |
| 549 | unsigned long *max_pfn = arg, pfn; |
| 550 | |
| 551 | if (start < end) { |
| 552 | pfn = PFN_UP(end -1); |
| 553 | if (pfn > *max_pfn) |
| 554 | *max_pfn = pfn; |
| 555 | } |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | static int __init |
| 560 | efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg) |
| 561 | { |
| 562 | memory_present(0, PFN_UP(start), PFN_DOWN(end)); |
| 563 | return 0; |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Find the highest page frame number we have available |
| 568 | */ |
| 569 | void __init find_max_pfn(void) |
| 570 | { |
| 571 | int i; |
| 572 | |
| 573 | max_pfn = 0; |
| 574 | if (efi_enabled) { |
| 575 | efi_memmap_walk(efi_find_max_pfn, &max_pfn); |
| 576 | efi_memmap_walk(efi_memory_present_wrapper, NULL); |
| 577 | return; |
| 578 | } |
| 579 | |
| 580 | for (i = 0; i < e820.nr_map; i++) { |
| 581 | unsigned long start, end; |
| 582 | /* RAM? */ |
| 583 | if (e820.map[i].type != E820_RAM) |
| 584 | continue; |
| 585 | start = PFN_UP(e820.map[i].addr); |
| 586 | end = PFN_DOWN(e820.map[i].addr + e820.map[i].size); |
| 587 | if (start >= end) |
| 588 | continue; |
| 589 | if (end > max_pfn) |
| 590 | max_pfn = end; |
| 591 | memory_present(0, start, end); |
| 592 | } |
| 593 | } |