| 1 | /* |
| 2 | * Copyright (C) 1995 Linus Torvalds |
| 3 | * |
| 4 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
| 5 | * |
| 6 | * Memory region support |
| 7 | * David Parsons <orc@pell.chi.il.us>, July-August 1999 |
| 8 | * |
| 9 | * Added E820 sanitization routine (removes overlapping memory regions); |
| 10 | * Brian Moyle <bmoyle@mvista.com>, February 2001 |
| 11 | * |
| 12 | * Moved CPU detection code to cpu/${cpu}.c |
| 13 | * Patrick Mochel <mochel@osdl.org>, March 2002 |
| 14 | * |
| 15 | * Provisions for empty E820 memory regions (reported by certain BIOSes). |
| 16 | * Alex Achenbach <xela@slit.de>, December 2002. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * This file handles the architecture-dependent parts of initialization |
| 22 | */ |
| 23 | |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/mmzone.h> |
| 27 | #include <linux/screen_info.h> |
| 28 | #include <linux/ioport.h> |
| 29 | #include <linux/acpi.h> |
| 30 | #include <linux/apm_bios.h> |
| 31 | #include <linux/initrd.h> |
| 32 | #include <linux/bootmem.h> |
| 33 | #include <linux/seq_file.h> |
| 34 | #include <linux/console.h> |
| 35 | #include <linux/mca.h> |
| 36 | #include <linux/root_dev.h> |
| 37 | #include <linux/highmem.h> |
| 38 | #include <linux/module.h> |
| 39 | #include <linux/efi.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/edd.h> |
| 42 | #include <linux/nodemask.h> |
| 43 | #include <linux/kexec.h> |
| 44 | #include <linux/crash_dump.h> |
| 45 | #include <linux/dmi.h> |
| 46 | #include <linux/pfn.h> |
| 47 | |
| 48 | #include <video/edid.h> |
| 49 | |
| 50 | #include <asm/apic.h> |
| 51 | #include <asm/e820.h> |
| 52 | #include <asm/mpspec.h> |
| 53 | #include <asm/mmzone.h> |
| 54 | #include <asm/setup.h> |
| 55 | #include <asm/arch_hooks.h> |
| 56 | #include <asm/sections.h> |
| 57 | #include <asm/io_apic.h> |
| 58 | #include <asm/ist.h> |
| 59 | #include <asm/io.h> |
| 60 | #include <asm/vmi.h> |
| 61 | #include <setup_arch.h> |
| 62 | #include <bios_ebda.h> |
| 63 | |
| 64 | /* This value is set up by the early boot code to point to the value |
| 65 | immediately after the boot time page tables. It contains a *physical* |
| 66 | address, and must not be in the .bss segment! */ |
| 67 | unsigned long init_pg_tables_end __initdata = ~0UL; |
| 68 | |
| 69 | int disable_pse __devinitdata = 0; |
| 70 | |
| 71 | /* |
| 72 | * Machine setup.. |
| 73 | */ |
| 74 | extern struct resource code_resource; |
| 75 | extern struct resource data_resource; |
| 76 | |
| 77 | /* cpu data as detected by the assembly code in head.S */ |
| 78 | struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 }; |
| 79 | /* common cpu data for all cpus */ |
| 80 | struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 }; |
| 81 | EXPORT_SYMBOL(boot_cpu_data); |
| 82 | |
| 83 | unsigned long mmu_cr4_features; |
| 84 | |
| 85 | /* for MCA, but anyone else can use it if they want */ |
| 86 | unsigned int machine_id; |
| 87 | #ifdef CONFIG_MCA |
| 88 | EXPORT_SYMBOL(machine_id); |
| 89 | #endif |
| 90 | unsigned int machine_submodel_id; |
| 91 | unsigned int BIOS_revision; |
| 92 | unsigned int mca_pentium_flag; |
| 93 | |
| 94 | /* Boot loader ID as an integer, for the benefit of proc_dointvec */ |
| 95 | int bootloader_type; |
| 96 | |
| 97 | /* user-defined highmem size */ |
| 98 | static unsigned int highmem_pages = -1; |
| 99 | |
| 100 | /* |
| 101 | * Setup options |
| 102 | */ |
| 103 | struct screen_info screen_info; |
| 104 | EXPORT_SYMBOL(screen_info); |
| 105 | struct apm_info apm_info; |
| 106 | EXPORT_SYMBOL(apm_info); |
| 107 | struct edid_info edid_info; |
| 108 | EXPORT_SYMBOL_GPL(edid_info); |
| 109 | struct ist_info ist_info; |
| 110 | #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ |
| 111 | defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) |
| 112 | EXPORT_SYMBOL(ist_info); |
| 113 | #endif |
| 114 | |
| 115 | extern void early_cpu_init(void); |
| 116 | extern int root_mountflags; |
| 117 | |
| 118 | unsigned long saved_videomode; |
| 119 | |
| 120 | #define RAMDISK_IMAGE_START_MASK 0x07FF |
| 121 | #define RAMDISK_PROMPT_FLAG 0x8000 |
| 122 | #define RAMDISK_LOAD_FLAG 0x4000 |
| 123 | |
| 124 | static char __initdata command_line[COMMAND_LINE_SIZE]; |
| 125 | |
| 126 | struct boot_params __initdata boot_params; |
| 127 | |
| 128 | #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) |
| 129 | struct edd edd; |
| 130 | #ifdef CONFIG_EDD_MODULE |
| 131 | EXPORT_SYMBOL(edd); |
| 132 | #endif |
| 133 | /** |
| 134 | * copy_edd() - Copy the BIOS EDD information |
| 135 | * from boot_params into a safe place. |
| 136 | * |
| 137 | */ |
| 138 | static inline void copy_edd(void) |
| 139 | { |
| 140 | memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, |
| 141 | sizeof(edd.mbr_signature)); |
| 142 | memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); |
| 143 | edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; |
| 144 | edd.edd_info_nr = boot_params.eddbuf_entries; |
| 145 | } |
| 146 | #else |
| 147 | static inline void copy_edd(void) |
| 148 | { |
| 149 | } |
| 150 | #endif |
| 151 | |
| 152 | int __initdata user_defined_memmap = 0; |
| 153 | |
| 154 | /* |
| 155 | * "mem=nopentium" disables the 4MB page tables. |
| 156 | * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM |
| 157 | * to <mem>, overriding the bios size. |
| 158 | * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from |
| 159 | * <start> to <start>+<mem>, overriding the bios size. |
| 160 | * |
| 161 | * HPA tells me bootloaders need to parse mem=, so no new |
| 162 | * option should be mem= [also see Documentation/i386/boot.txt] |
| 163 | */ |
| 164 | static int __init parse_mem(char *arg) |
| 165 | { |
| 166 | if (!arg) |
| 167 | return -EINVAL; |
| 168 | |
| 169 | if (strcmp(arg, "nopentium") == 0) { |
| 170 | clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability); |
| 171 | disable_pse = 1; |
| 172 | } else { |
| 173 | /* If the user specifies memory size, we |
| 174 | * limit the BIOS-provided memory map to |
| 175 | * that size. exactmap can be used to specify |
| 176 | * the exact map. mem=number can be used to |
| 177 | * trim the existing memory map. |
| 178 | */ |
| 179 | unsigned long long mem_size; |
| 180 | |
| 181 | mem_size = memparse(arg, &arg); |
| 182 | limit_regions(mem_size); |
| 183 | user_defined_memmap = 1; |
| 184 | } |
| 185 | return 0; |
| 186 | } |
| 187 | early_param("mem", parse_mem); |
| 188 | |
| 189 | #ifdef CONFIG_PROC_VMCORE |
| 190 | /* elfcorehdr= specifies the location of elf core header |
| 191 | * stored by the crashed kernel. |
| 192 | */ |
| 193 | static int __init parse_elfcorehdr(char *arg) |
| 194 | { |
| 195 | if (!arg) |
| 196 | return -EINVAL; |
| 197 | |
| 198 | elfcorehdr_addr = memparse(arg, &arg); |
| 199 | return 0; |
| 200 | } |
| 201 | early_param("elfcorehdr", parse_elfcorehdr); |
| 202 | #endif /* CONFIG_PROC_VMCORE */ |
| 203 | |
| 204 | /* |
| 205 | * highmem=size forces highmem to be exactly 'size' bytes. |
| 206 | * This works even on boxes that have no highmem otherwise. |
| 207 | * This also works to reduce highmem size on bigger boxes. |
| 208 | */ |
| 209 | static int __init parse_highmem(char *arg) |
| 210 | { |
| 211 | if (!arg) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; |
| 215 | return 0; |
| 216 | } |
| 217 | early_param("highmem", parse_highmem); |
| 218 | |
| 219 | /* |
| 220 | * vmalloc=size forces the vmalloc area to be exactly 'size' |
| 221 | * bytes. This can be used to increase (or decrease) the |
| 222 | * vmalloc area - the default is 128m. |
| 223 | */ |
| 224 | static int __init parse_vmalloc(char *arg) |
| 225 | { |
| 226 | if (!arg) |
| 227 | return -EINVAL; |
| 228 | |
| 229 | __VMALLOC_RESERVE = memparse(arg, &arg); |
| 230 | return 0; |
| 231 | } |
| 232 | early_param("vmalloc", parse_vmalloc); |
| 233 | |
| 234 | /* |
| 235 | * reservetop=size reserves a hole at the top of the kernel address space which |
| 236 | * a hypervisor can load into later. Needed for dynamically loaded hypervisors, |
| 237 | * so relocating the fixmap can be done before paging initialization. |
| 238 | */ |
| 239 | static int __init parse_reservetop(char *arg) |
| 240 | { |
| 241 | unsigned long address; |
| 242 | |
| 243 | if (!arg) |
| 244 | return -EINVAL; |
| 245 | |
| 246 | address = memparse(arg, &arg); |
| 247 | reserve_top_address(address); |
| 248 | return 0; |
| 249 | } |
| 250 | early_param("reservetop", parse_reservetop); |
| 251 | |
| 252 | /* |
| 253 | * Determine low and high memory ranges: |
| 254 | */ |
| 255 | unsigned long __init find_max_low_pfn(void) |
| 256 | { |
| 257 | unsigned long max_low_pfn; |
| 258 | |
| 259 | max_low_pfn = max_pfn; |
| 260 | if (max_low_pfn > MAXMEM_PFN) { |
| 261 | if (highmem_pages == -1) |
| 262 | highmem_pages = max_pfn - MAXMEM_PFN; |
| 263 | if (highmem_pages + MAXMEM_PFN < max_pfn) |
| 264 | max_pfn = MAXMEM_PFN + highmem_pages; |
| 265 | if (highmem_pages + MAXMEM_PFN > max_pfn) { |
| 266 | printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages)); |
| 267 | highmem_pages = 0; |
| 268 | } |
| 269 | max_low_pfn = MAXMEM_PFN; |
| 270 | #ifndef CONFIG_HIGHMEM |
| 271 | /* Maximum memory usable is what is directly addressable */ |
| 272 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", |
| 273 | MAXMEM>>20); |
| 274 | if (max_pfn > MAX_NONPAE_PFN) |
| 275 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); |
| 276 | else |
| 277 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); |
| 278 | max_pfn = MAXMEM_PFN; |
| 279 | #else /* !CONFIG_HIGHMEM */ |
| 280 | #ifndef CONFIG_HIGHMEM64G |
| 281 | if (max_pfn > MAX_NONPAE_PFN) { |
| 282 | max_pfn = MAX_NONPAE_PFN; |
| 283 | printk(KERN_WARNING "Warning only 4GB will be used.\n"); |
| 284 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); |
| 285 | } |
| 286 | #endif /* !CONFIG_HIGHMEM64G */ |
| 287 | #endif /* !CONFIG_HIGHMEM */ |
| 288 | } else { |
| 289 | if (highmem_pages == -1) |
| 290 | highmem_pages = 0; |
| 291 | #ifdef CONFIG_HIGHMEM |
| 292 | if (highmem_pages >= max_pfn) { |
| 293 | printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); |
| 294 | highmem_pages = 0; |
| 295 | } |
| 296 | if (highmem_pages) { |
| 297 | if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){ |
| 298 | printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages)); |
| 299 | highmem_pages = 0; |
| 300 | } |
| 301 | max_low_pfn -= highmem_pages; |
| 302 | } |
| 303 | #else |
| 304 | if (highmem_pages) |
| 305 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); |
| 306 | #endif |
| 307 | } |
| 308 | return max_low_pfn; |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * workaround for Dell systems that neglect to reserve EBDA |
| 313 | */ |
| 314 | static void __init reserve_ebda_region(void) |
| 315 | { |
| 316 | unsigned int addr; |
| 317 | addr = get_bios_ebda(); |
| 318 | if (addr) |
| 319 | reserve_bootmem(addr, PAGE_SIZE); |
| 320 | } |
| 321 | |
| 322 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
| 323 | void __init setup_bootmem_allocator(void); |
| 324 | static unsigned long __init setup_memory(void) |
| 325 | { |
| 326 | /* |
| 327 | * partially used pages are not usable - thus |
| 328 | * we are rounding upwards: |
| 329 | */ |
| 330 | min_low_pfn = PFN_UP(init_pg_tables_end); |
| 331 | |
| 332 | find_max_pfn(); |
| 333 | |
| 334 | max_low_pfn = find_max_low_pfn(); |
| 335 | |
| 336 | #ifdef CONFIG_HIGHMEM |
| 337 | highstart_pfn = highend_pfn = max_pfn; |
| 338 | if (max_pfn > max_low_pfn) { |
| 339 | highstart_pfn = max_low_pfn; |
| 340 | } |
| 341 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
| 342 | pages_to_mb(highend_pfn - highstart_pfn)); |
| 343 | num_physpages = highend_pfn; |
| 344 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; |
| 345 | #else |
| 346 | num_physpages = max_low_pfn; |
| 347 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; |
| 348 | #endif |
| 349 | #ifdef CONFIG_FLATMEM |
| 350 | max_mapnr = num_physpages; |
| 351 | #endif |
| 352 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", |
| 353 | pages_to_mb(max_low_pfn)); |
| 354 | |
| 355 | setup_bootmem_allocator(); |
| 356 | |
| 357 | return max_low_pfn; |
| 358 | } |
| 359 | |
| 360 | void __init zone_sizes_init(void) |
| 361 | { |
| 362 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
| 363 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 364 | max_zone_pfns[ZONE_DMA] = |
| 365 | virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; |
| 366 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
| 367 | #ifdef CONFIG_HIGHMEM |
| 368 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; |
| 369 | add_active_range(0, 0, highend_pfn); |
| 370 | #else |
| 371 | add_active_range(0, 0, max_low_pfn); |
| 372 | #endif |
| 373 | |
| 374 | free_area_init_nodes(max_zone_pfns); |
| 375 | } |
| 376 | #else |
| 377 | extern unsigned long __init setup_memory(void); |
| 378 | extern void zone_sizes_init(void); |
| 379 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
| 380 | |
| 381 | static inline unsigned long long get_total_mem(void) |
| 382 | { |
| 383 | unsigned long long total; |
| 384 | |
| 385 | total = max_low_pfn - min_low_pfn; |
| 386 | #ifdef CONFIG_HIGHMEM |
| 387 | total += highend_pfn - highstart_pfn; |
| 388 | #endif |
| 389 | |
| 390 | return total << PAGE_SHIFT; |
| 391 | } |
| 392 | |
| 393 | #ifdef CONFIG_KEXEC |
| 394 | static void __init reserve_crashkernel(void) |
| 395 | { |
| 396 | unsigned long long total_mem; |
| 397 | unsigned long long crash_size, crash_base; |
| 398 | int ret; |
| 399 | |
| 400 | total_mem = get_total_mem(); |
| 401 | |
| 402 | ret = parse_crashkernel(boot_command_line, total_mem, |
| 403 | &crash_size, &crash_base); |
| 404 | if (ret == 0 && crash_size > 0) { |
| 405 | if (crash_base > 0) { |
| 406 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
| 407 | "for crashkernel (System RAM: %ldMB)\n", |
| 408 | (unsigned long)(crash_size >> 20), |
| 409 | (unsigned long)(crash_base >> 20), |
| 410 | (unsigned long)(total_mem >> 20)); |
| 411 | crashk_res.start = crash_base; |
| 412 | crashk_res.end = crash_base + crash_size - 1; |
| 413 | reserve_bootmem(crash_base, crash_size); |
| 414 | } else |
| 415 | printk(KERN_INFO "crashkernel reservation failed - " |
| 416 | "you have to specify a base address\n"); |
| 417 | } |
| 418 | } |
| 419 | #else |
| 420 | static inline void __init reserve_crashkernel(void) |
| 421 | {} |
| 422 | #endif |
| 423 | |
| 424 | void __init setup_bootmem_allocator(void) |
| 425 | { |
| 426 | unsigned long bootmap_size; |
| 427 | /* |
| 428 | * Initialize the boot-time allocator (with low memory only): |
| 429 | */ |
| 430 | bootmap_size = init_bootmem(min_low_pfn, max_low_pfn); |
| 431 | |
| 432 | register_bootmem_low_pages(max_low_pfn); |
| 433 | |
| 434 | /* |
| 435 | * Reserve the bootmem bitmap itself as well. We do this in two |
| 436 | * steps (first step was init_bootmem()) because this catches |
| 437 | * the (very unlikely) case of us accidentally initializing the |
| 438 | * bootmem allocator with an invalid RAM area. |
| 439 | */ |
| 440 | reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) + |
| 441 | bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text)); |
| 442 | |
| 443 | /* |
| 444 | * reserve physical page 0 - it's a special BIOS page on many boxes, |
| 445 | * enabling clean reboots, SMP operation, laptop functions. |
| 446 | */ |
| 447 | reserve_bootmem(0, PAGE_SIZE); |
| 448 | |
| 449 | /* reserve EBDA region, it's a 4K region */ |
| 450 | reserve_ebda_region(); |
| 451 | |
| 452 | /* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent |
| 453 | PCI prefetch into it (errata #56). Usually the page is reserved anyways, |
| 454 | unless you have no PS/2 mouse plugged in. */ |
| 455 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && |
| 456 | boot_cpu_data.x86 == 6) |
| 457 | reserve_bootmem(0xa0000 - 4096, 4096); |
| 458 | |
| 459 | #ifdef CONFIG_SMP |
| 460 | /* |
| 461 | * But first pinch a few for the stack/trampoline stuff |
| 462 | * FIXME: Don't need the extra page at 4K, but need to fix |
| 463 | * trampoline before removing it. (see the GDT stuff) |
| 464 | */ |
| 465 | reserve_bootmem(PAGE_SIZE, PAGE_SIZE); |
| 466 | #endif |
| 467 | #ifdef CONFIG_ACPI_SLEEP |
| 468 | /* |
| 469 | * Reserve low memory region for sleep support. |
| 470 | */ |
| 471 | acpi_reserve_bootmem(); |
| 472 | #endif |
| 473 | #ifdef CONFIG_X86_FIND_SMP_CONFIG |
| 474 | /* |
| 475 | * Find and reserve possible boot-time SMP configuration: |
| 476 | */ |
| 477 | find_smp_config(); |
| 478 | #endif |
| 479 | numa_kva_reserve(); |
| 480 | #ifdef CONFIG_BLK_DEV_INITRD |
| 481 | if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { |
| 482 | unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; |
| 483 | unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; |
| 484 | unsigned long ramdisk_end = ramdisk_image + ramdisk_size; |
| 485 | unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT; |
| 486 | |
| 487 | if (ramdisk_end <= end_of_lowmem) { |
| 488 | reserve_bootmem(ramdisk_image, ramdisk_size); |
| 489 | initrd_start = ramdisk_image + PAGE_OFFSET; |
| 490 | initrd_end = initrd_start+ramdisk_size; |
| 491 | } else { |
| 492 | printk(KERN_ERR "initrd extends beyond end of memory " |
| 493 | "(0x%08lx > 0x%08lx)\ndisabling initrd\n", |
| 494 | ramdisk_end, end_of_lowmem); |
| 495 | initrd_start = 0; |
| 496 | } |
| 497 | } |
| 498 | #endif |
| 499 | reserve_crashkernel(); |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * The node 0 pgdat is initialized before all of these because |
| 504 | * it's needed for bootmem. node>0 pgdats have their virtual |
| 505 | * space allocated before the pagetables are in place to access |
| 506 | * them, so they can't be cleared then. |
| 507 | * |
| 508 | * This should all compile down to nothing when NUMA is off. |
| 509 | */ |
| 510 | static void __init remapped_pgdat_init(void) |
| 511 | { |
| 512 | int nid; |
| 513 | |
| 514 | for_each_online_node(nid) { |
| 515 | if (nid != 0) |
| 516 | memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | #ifdef CONFIG_MCA |
| 521 | static void set_mca_bus(int x) |
| 522 | { |
| 523 | MCA_bus = x; |
| 524 | } |
| 525 | #else |
| 526 | static void set_mca_bus(int x) { } |
| 527 | #endif |
| 528 | |
| 529 | /* Overridden in paravirt.c if CONFIG_PARAVIRT */ |
| 530 | char * __init __attribute__((weak)) memory_setup(void) |
| 531 | { |
| 532 | return machine_specific_memory_setup(); |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Determine if we were loaded by an EFI loader. If so, then we have also been |
| 537 | * passed the efi memmap, systab, etc., so we should use these data structures |
| 538 | * for initialization. Note, the efi init code path is determined by the |
| 539 | * global efi_enabled. This allows the same kernel image to be used on existing |
| 540 | * systems (with a traditional BIOS) as well as on EFI systems. |
| 541 | */ |
| 542 | void __init setup_arch(char **cmdline_p) |
| 543 | { |
| 544 | unsigned long max_low_pfn; |
| 545 | |
| 546 | memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); |
| 547 | pre_setup_arch_hook(); |
| 548 | early_cpu_init(); |
| 549 | |
| 550 | /* |
| 551 | * FIXME: This isn't an official loader_type right |
| 552 | * now but does currently work with elilo. |
| 553 | * If we were configured as an EFI kernel, check to make |
| 554 | * sure that we were loaded correctly from elilo and that |
| 555 | * the system table is valid. If not, then initialize normally. |
| 556 | */ |
| 557 | #ifdef CONFIG_EFI |
| 558 | if ((boot_params.hdr.type_of_loader == 0x50) && |
| 559 | boot_params.efi_info.efi_systab) |
| 560 | efi_enabled = 1; |
| 561 | #endif |
| 562 | |
| 563 | ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); |
| 564 | screen_info = boot_params.screen_info; |
| 565 | edid_info = boot_params.edid_info; |
| 566 | apm_info.bios = boot_params.apm_bios_info; |
| 567 | ist_info = boot_params.ist_info; |
| 568 | saved_videomode = boot_params.hdr.vid_mode; |
| 569 | if( boot_params.sys_desc_table.length != 0 ) { |
| 570 | set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2); |
| 571 | machine_id = boot_params.sys_desc_table.table[0]; |
| 572 | machine_submodel_id = boot_params.sys_desc_table.table[1]; |
| 573 | BIOS_revision = boot_params.sys_desc_table.table[2]; |
| 574 | } |
| 575 | bootloader_type = boot_params.hdr.type_of_loader; |
| 576 | |
| 577 | #ifdef CONFIG_BLK_DEV_RAM |
| 578 | rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; |
| 579 | rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); |
| 580 | rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); |
| 581 | #endif |
| 582 | ARCH_SETUP |
| 583 | if (efi_enabled) |
| 584 | efi_init(); |
| 585 | else { |
| 586 | printk(KERN_INFO "BIOS-provided physical RAM map:\n"); |
| 587 | print_memory_map(memory_setup()); |
| 588 | } |
| 589 | |
| 590 | copy_edd(); |
| 591 | |
| 592 | if (!boot_params.hdr.root_flags) |
| 593 | root_mountflags &= ~MS_RDONLY; |
| 594 | init_mm.start_code = (unsigned long) _text; |
| 595 | init_mm.end_code = (unsigned long) _etext; |
| 596 | init_mm.end_data = (unsigned long) _edata; |
| 597 | init_mm.brk = init_pg_tables_end + PAGE_OFFSET; |
| 598 | |
| 599 | code_resource.start = virt_to_phys(_text); |
| 600 | code_resource.end = virt_to_phys(_etext)-1; |
| 601 | data_resource.start = virt_to_phys(_etext); |
| 602 | data_resource.end = virt_to_phys(_edata)-1; |
| 603 | |
| 604 | parse_early_param(); |
| 605 | |
| 606 | if (user_defined_memmap) { |
| 607 | printk(KERN_INFO "user-defined physical RAM map:\n"); |
| 608 | print_memory_map("user"); |
| 609 | } |
| 610 | |
| 611 | strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); |
| 612 | *cmdline_p = command_line; |
| 613 | |
| 614 | max_low_pfn = setup_memory(); |
| 615 | |
| 616 | #ifdef CONFIG_VMI |
| 617 | /* |
| 618 | * Must be after max_low_pfn is determined, and before kernel |
| 619 | * pagetables are setup. |
| 620 | */ |
| 621 | vmi_init(); |
| 622 | #endif |
| 623 | |
| 624 | /* |
| 625 | * NOTE: before this point _nobody_ is allowed to allocate |
| 626 | * any memory using the bootmem allocator. Although the |
| 627 | * alloctor is now initialised only the first 8Mb of the kernel |
| 628 | * virtual address space has been mapped. All allocations before |
| 629 | * paging_init() has completed must use the alloc_bootmem_low_pages() |
| 630 | * variant (which allocates DMA'able memory) and care must be taken |
| 631 | * not to exceed the 8Mb limit. |
| 632 | */ |
| 633 | |
| 634 | #ifdef CONFIG_SMP |
| 635 | smp_alloc_memory(); /* AP processor realmode stacks in low memory*/ |
| 636 | #endif |
| 637 | paging_init(); |
| 638 | remapped_pgdat_init(); |
| 639 | sparse_init(); |
| 640 | zone_sizes_init(); |
| 641 | |
| 642 | /* |
| 643 | * NOTE: at this point the bootmem allocator is fully available. |
| 644 | */ |
| 645 | |
| 646 | paravirt_post_allocator_init(); |
| 647 | |
| 648 | dmi_scan_machine(); |
| 649 | |
| 650 | #ifdef CONFIG_X86_GENERICARCH |
| 651 | generic_apic_probe(); |
| 652 | #endif |
| 653 | if (efi_enabled) |
| 654 | efi_map_memmap(); |
| 655 | |
| 656 | #ifdef CONFIG_ACPI |
| 657 | /* |
| 658 | * Parse the ACPI tables for possible boot-time SMP configuration. |
| 659 | */ |
| 660 | acpi_boot_table_init(); |
| 661 | #endif |
| 662 | |
| 663 | #ifdef CONFIG_PCI |
| 664 | #ifdef CONFIG_X86_IO_APIC |
| 665 | check_acpi_pci(); /* Checks more than just ACPI actually */ |
| 666 | #endif |
| 667 | #endif |
| 668 | |
| 669 | #ifdef CONFIG_ACPI |
| 670 | acpi_boot_init(); |
| 671 | |
| 672 | #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC) |
| 673 | if (def_to_bigsmp) |
| 674 | printk(KERN_WARNING "More than 8 CPUs detected and " |
| 675 | "CONFIG_X86_PC cannot handle it.\nUse " |
| 676 | "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n"); |
| 677 | #endif |
| 678 | #endif |
| 679 | #ifdef CONFIG_X86_LOCAL_APIC |
| 680 | if (smp_found_config) |
| 681 | get_smp_config(); |
| 682 | #endif |
| 683 | |
| 684 | e820_register_memory(); |
| 685 | e820_mark_nosave_regions(); |
| 686 | |
| 687 | #ifdef CONFIG_VT |
| 688 | #if defined(CONFIG_VGA_CONSOLE) |
| 689 | if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) |
| 690 | conswitchp = &vga_con; |
| 691 | #elif defined(CONFIG_DUMMY_CONSOLE) |
| 692 | conswitchp = &dummy_con; |
| 693 | #endif |
| 694 | #endif |
| 695 | } |