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1da177e4 LT |
1 | /* |
2 | * linux/arch/i386/kernel/setup.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * | |
6 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
7 | * | |
8 | * Memory region support | |
9 | * David Parsons <orc@pell.chi.il.us>, July-August 1999 | |
10 | * | |
11 | * Added E820 sanitization routine (removes overlapping memory regions); | |
12 | * Brian Moyle <bmoyle@mvista.com>, February 2001 | |
13 | * | |
14 | * Moved CPU detection code to cpu/${cpu}.c | |
15 | * Patrick Mochel <mochel@osdl.org>, March 2002 | |
16 | * | |
17 | * Provisions for empty E820 memory regions (reported by certain BIOSes). | |
18 | * Alex Achenbach <xela@slit.de>, December 2002. | |
19 | * | |
20 | */ | |
21 | ||
22 | /* | |
23 | * This file handles the architecture-dependent parts of initialization | |
24 | */ | |
25 | ||
26 | #include <linux/sched.h> | |
27 | #include <linux/mm.h> | |
05b79bdc | 28 | #include <linux/mmzone.h> |
894673ee | 29 | #include <linux/screen_info.h> |
1da177e4 LT |
30 | #include <linux/ioport.h> |
31 | #include <linux/acpi.h> | |
32 | #include <linux/apm_bios.h> | |
33 | #include <linux/initrd.h> | |
34 | #include <linux/bootmem.h> | |
35 | #include <linux/seq_file.h> | |
e5c6c8e4 | 36 | #include <linux/platform_device.h> |
1da177e4 LT |
37 | #include <linux/console.h> |
38 | #include <linux/mca.h> | |
39 | #include <linux/root_dev.h> | |
40 | #include <linux/highmem.h> | |
41 | #include <linux/module.h> | |
42 | #include <linux/efi.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/edd.h> | |
45 | #include <linux/nodemask.h> | |
1bc3b91a | 46 | #include <linux/kexec.h> |
2030eae5 | 47 | #include <linux/crash_dump.h> |
e9928674 | 48 | #include <linux/dmi.h> |
22a9835c | 49 | #include <linux/pfn.h> |
1bc3b91a | 50 | |
1da177e4 | 51 | #include <video/edid.h> |
1bc3b91a | 52 | |
9635b47d | 53 | #include <asm/apic.h> |
1da177e4 LT |
54 | #include <asm/e820.h> |
55 | #include <asm/mpspec.h> | |
56 | #include <asm/setup.h> | |
57 | #include <asm/arch_hooks.h> | |
58 | #include <asm/sections.h> | |
59 | #include <asm/io_apic.h> | |
60 | #include <asm/ist.h> | |
61 | #include <asm/io.h> | |
e75eac33 | 62 | #include <setup_arch.h> |
1da177e4 LT |
63 | #include <bios_ebda.h> |
64 | ||
92aa63a5 VG |
65 | /* Forward Declaration. */ |
66 | void __init find_max_pfn(void); | |
67 | ||
1da177e4 LT |
68 | /* This value is set up by the early boot code to point to the value |
69 | immediately after the boot time page tables. It contains a *physical* | |
70 | address, and must not be in the .bss segment! */ | |
71 | unsigned long init_pg_tables_end __initdata = ~0UL; | |
72 | ||
0bb3184d | 73 | int disable_pse __devinitdata = 0; |
1da177e4 LT |
74 | |
75 | /* | |
76 | * Machine setup.. | |
77 | */ | |
78 | ||
79 | #ifdef CONFIG_EFI | |
80 | int efi_enabled = 0; | |
81 | EXPORT_SYMBOL(efi_enabled); | |
82 | #endif | |
83 | ||
84 | /* cpu data as detected by the assembly code in head.S */ | |
85 | struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 }; | |
86 | /* common cpu data for all cpus */ | |
c3d8c141 | 87 | struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 }; |
129f6946 | 88 | EXPORT_SYMBOL(boot_cpu_data); |
1da177e4 LT |
89 | |
90 | unsigned long mmu_cr4_features; | |
91 | ||
8466361a | 92 | #ifdef CONFIG_ACPI |
1da177e4 LT |
93 | int acpi_disabled = 0; |
94 | #else | |
95 | int acpi_disabled = 1; | |
96 | #endif | |
97 | EXPORT_SYMBOL(acpi_disabled); | |
98 | ||
888ba6c6 | 99 | #ifdef CONFIG_ACPI |
1da177e4 LT |
100 | int __initdata acpi_force = 0; |
101 | extern acpi_interrupt_flags acpi_sci_flags; | |
102 | #endif | |
103 | ||
104 | /* for MCA, but anyone else can use it if they want */ | |
105 | unsigned int machine_id; | |
129f6946 AD |
106 | #ifdef CONFIG_MCA |
107 | EXPORT_SYMBOL(machine_id); | |
108 | #endif | |
1da177e4 LT |
109 | unsigned int machine_submodel_id; |
110 | unsigned int BIOS_revision; | |
111 | unsigned int mca_pentium_flag; | |
112 | ||
113 | /* For PCI or other memory-mapped resources */ | |
114 | unsigned long pci_mem_start = 0x10000000; | |
129f6946 AD |
115 | #ifdef CONFIG_PCI |
116 | EXPORT_SYMBOL(pci_mem_start); | |
117 | #endif | |
1da177e4 LT |
118 | |
119 | /* Boot loader ID as an integer, for the benefit of proc_dointvec */ | |
120 | int bootloader_type; | |
121 | ||
122 | /* user-defined highmem size */ | |
123 | static unsigned int highmem_pages = -1; | |
124 | ||
125 | /* | |
126 | * Setup options | |
127 | */ | |
128 | struct drive_info_struct { char dummy[32]; } drive_info; | |
129f6946 AD |
129 | #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \ |
130 | defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE) | |
131 | EXPORT_SYMBOL(drive_info); | |
132 | #endif | |
1da177e4 | 133 | struct screen_info screen_info; |
129f6946 | 134 | EXPORT_SYMBOL(screen_info); |
1da177e4 | 135 | struct apm_info apm_info; |
129f6946 | 136 | EXPORT_SYMBOL(apm_info); |
1da177e4 LT |
137 | struct sys_desc_table_struct { |
138 | unsigned short length; | |
139 | unsigned char table[0]; | |
140 | }; | |
141 | struct edid_info edid_info; | |
5e518d76 | 142 | EXPORT_SYMBOL_GPL(edid_info); |
1da177e4 | 143 | struct ist_info ist_info; |
129f6946 AD |
144 | #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ |
145 | defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) | |
146 | EXPORT_SYMBOL(ist_info); | |
147 | #endif | |
1da177e4 LT |
148 | struct e820map e820; |
149 | ||
150 | extern void early_cpu_init(void); | |
1da177e4 LT |
151 | extern void generic_apic_probe(char *); |
152 | extern int root_mountflags; | |
153 | ||
154 | unsigned long saved_videomode; | |
155 | ||
156 | #define RAMDISK_IMAGE_START_MASK 0x07FF | |
157 | #define RAMDISK_PROMPT_FLAG 0x8000 | |
158 | #define RAMDISK_LOAD_FLAG 0x4000 | |
159 | ||
160 | static char command_line[COMMAND_LINE_SIZE]; | |
161 | ||
162 | unsigned char __initdata boot_params[PARAM_SIZE]; | |
163 | ||
164 | static struct resource data_resource = { | |
165 | .name = "Kernel data", | |
166 | .start = 0, | |
167 | .end = 0, | |
168 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
169 | }; | |
170 | ||
171 | static struct resource code_resource = { | |
172 | .name = "Kernel code", | |
173 | .start = 0, | |
174 | .end = 0, | |
175 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
176 | }; | |
177 | ||
178 | static struct resource system_rom_resource = { | |
179 | .name = "System ROM", | |
180 | .start = 0xf0000, | |
181 | .end = 0xfffff, | |
182 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
183 | }; | |
184 | ||
185 | static struct resource extension_rom_resource = { | |
186 | .name = "Extension ROM", | |
187 | .start = 0xe0000, | |
188 | .end = 0xeffff, | |
189 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
190 | }; | |
191 | ||
192 | static struct resource adapter_rom_resources[] = { { | |
193 | .name = "Adapter ROM", | |
194 | .start = 0xc8000, | |
195 | .end = 0, | |
196 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
197 | }, { | |
198 | .name = "Adapter ROM", | |
199 | .start = 0, | |
200 | .end = 0, | |
201 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
202 | }, { | |
203 | .name = "Adapter ROM", | |
204 | .start = 0, | |
205 | .end = 0, | |
206 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
207 | }, { | |
208 | .name = "Adapter ROM", | |
209 | .start = 0, | |
210 | .end = 0, | |
211 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
212 | }, { | |
213 | .name = "Adapter ROM", | |
214 | .start = 0, | |
215 | .end = 0, | |
216 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
217 | }, { | |
218 | .name = "Adapter ROM", | |
219 | .start = 0, | |
220 | .end = 0, | |
221 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
222 | } }; | |
223 | ||
224 | #define ADAPTER_ROM_RESOURCES \ | |
225 | (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0]) | |
226 | ||
227 | static struct resource video_rom_resource = { | |
228 | .name = "Video ROM", | |
229 | .start = 0xc0000, | |
230 | .end = 0xc7fff, | |
231 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
232 | }; | |
233 | ||
234 | static struct resource video_ram_resource = { | |
235 | .name = "Video RAM area", | |
236 | .start = 0xa0000, | |
237 | .end = 0xbffff, | |
238 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
239 | }; | |
240 | ||
241 | static struct resource standard_io_resources[] = { { | |
242 | .name = "dma1", | |
243 | .start = 0x0000, | |
244 | .end = 0x001f, | |
245 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
246 | }, { | |
247 | .name = "pic1", | |
248 | .start = 0x0020, | |
249 | .end = 0x0021, | |
250 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
251 | }, { | |
252 | .name = "timer0", | |
253 | .start = 0x0040, | |
254 | .end = 0x0043, | |
255 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
256 | }, { | |
257 | .name = "timer1", | |
258 | .start = 0x0050, | |
259 | .end = 0x0053, | |
260 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
261 | }, { | |
262 | .name = "keyboard", | |
263 | .start = 0x0060, | |
264 | .end = 0x006f, | |
265 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
266 | }, { | |
267 | .name = "dma page reg", | |
268 | .start = 0x0080, | |
269 | .end = 0x008f, | |
270 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
271 | }, { | |
272 | .name = "pic2", | |
273 | .start = 0x00a0, | |
274 | .end = 0x00a1, | |
275 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
276 | }, { | |
277 | .name = "dma2", | |
278 | .start = 0x00c0, | |
279 | .end = 0x00df, | |
280 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
281 | }, { | |
282 | .name = "fpu", | |
283 | .start = 0x00f0, | |
284 | .end = 0x00ff, | |
285 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
286 | } }; | |
287 | ||
288 | #define STANDARD_IO_RESOURCES \ | |
289 | (sizeof standard_io_resources / sizeof standard_io_resources[0]) | |
290 | ||
291 | #define romsignature(x) (*(unsigned short *)(x) == 0xaa55) | |
292 | ||
293 | static int __init romchecksum(unsigned char *rom, unsigned long length) | |
294 | { | |
295 | unsigned char *p, sum = 0; | |
296 | ||
297 | for (p = rom; p < rom + length; p++) | |
298 | sum += *p; | |
299 | return sum == 0; | |
300 | } | |
301 | ||
302 | static void __init probe_roms(void) | |
303 | { | |
304 | unsigned long start, length, upper; | |
305 | unsigned char *rom; | |
306 | int i; | |
307 | ||
308 | /* video rom */ | |
309 | upper = adapter_rom_resources[0].start; | |
310 | for (start = video_rom_resource.start; start < upper; start += 2048) { | |
311 | rom = isa_bus_to_virt(start); | |
312 | if (!romsignature(rom)) | |
313 | continue; | |
314 | ||
315 | video_rom_resource.start = start; | |
316 | ||
317 | /* 0 < length <= 0x7f * 512, historically */ | |
318 | length = rom[2] * 512; | |
319 | ||
320 | /* if checksum okay, trust length byte */ | |
321 | if (length && romchecksum(rom, length)) | |
322 | video_rom_resource.end = start + length - 1; | |
323 | ||
324 | request_resource(&iomem_resource, &video_rom_resource); | |
325 | break; | |
326 | } | |
327 | ||
328 | start = (video_rom_resource.end + 1 + 2047) & ~2047UL; | |
329 | if (start < upper) | |
330 | start = upper; | |
331 | ||
332 | /* system rom */ | |
333 | request_resource(&iomem_resource, &system_rom_resource); | |
334 | upper = system_rom_resource.start; | |
335 | ||
336 | /* check for extension rom (ignore length byte!) */ | |
337 | rom = isa_bus_to_virt(extension_rom_resource.start); | |
338 | if (romsignature(rom)) { | |
339 | length = extension_rom_resource.end - extension_rom_resource.start + 1; | |
340 | if (romchecksum(rom, length)) { | |
341 | request_resource(&iomem_resource, &extension_rom_resource); | |
342 | upper = extension_rom_resource.start; | |
343 | } | |
344 | } | |
345 | ||
346 | /* check for adapter roms on 2k boundaries */ | |
347 | for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) { | |
348 | rom = isa_bus_to_virt(start); | |
349 | if (!romsignature(rom)) | |
350 | continue; | |
351 | ||
352 | /* 0 < length <= 0x7f * 512, historically */ | |
353 | length = rom[2] * 512; | |
354 | ||
355 | /* but accept any length that fits if checksum okay */ | |
356 | if (!length || start + length > upper || !romchecksum(rom, length)) | |
357 | continue; | |
358 | ||
359 | adapter_rom_resources[i].start = start; | |
360 | adapter_rom_resources[i].end = start + length - 1; | |
361 | request_resource(&iomem_resource, &adapter_rom_resources[i]); | |
362 | ||
363 | start = adapter_rom_resources[i++].end & ~2047UL; | |
364 | } | |
365 | } | |
366 | ||
367 | static void __init limit_regions(unsigned long long size) | |
368 | { | |
369 | unsigned long long current_addr = 0; | |
370 | int i; | |
371 | ||
372 | if (efi_enabled) { | |
7ae65fd3 MT |
373 | efi_memory_desc_t *md; |
374 | void *p; | |
375 | ||
376 | for (p = memmap.map, i = 0; p < memmap.map_end; | |
377 | p += memmap.desc_size, i++) { | |
378 | md = p; | |
379 | current_addr = md->phys_addr + (md->num_pages << 12); | |
380 | if (md->type == EFI_CONVENTIONAL_MEMORY) { | |
1da177e4 | 381 | if (current_addr >= size) { |
7ae65fd3 | 382 | md->num_pages -= |
1da177e4 LT |
383 | (((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT); |
384 | memmap.nr_map = i + 1; | |
385 | return; | |
386 | } | |
387 | } | |
388 | } | |
389 | } | |
390 | for (i = 0; i < e820.nr_map; i++) { | |
f014a556 DH |
391 | current_addr = e820.map[i].addr + e820.map[i].size; |
392 | if (current_addr < size) | |
393 | continue; | |
394 | ||
395 | if (e820.map[i].type != E820_RAM) | |
396 | continue; | |
397 | ||
398 | if (e820.map[i].addr >= size) { | |
399 | /* | |
400 | * This region starts past the end of the | |
401 | * requested size, skip it completely. | |
402 | */ | |
403 | e820.nr_map = i; | |
404 | } else { | |
405 | e820.nr_map = i + 1; | |
406 | e820.map[i].size -= current_addr - size; | |
1da177e4 | 407 | } |
f014a556 | 408 | return; |
1da177e4 LT |
409 | } |
410 | } | |
411 | ||
e75eac33 JF |
412 | void __init add_memory_region(unsigned long long start, |
413 | unsigned long long size, int type) | |
1da177e4 LT |
414 | { |
415 | int x; | |
416 | ||
417 | if (!efi_enabled) { | |
418 | x = e820.nr_map; | |
419 | ||
420 | if (x == E820MAX) { | |
421 | printk(KERN_ERR "Ooops! Too many entries in the memory map!\n"); | |
422 | return; | |
423 | } | |
424 | ||
425 | e820.map[x].addr = start; | |
426 | e820.map[x].size = size; | |
427 | e820.map[x].type = type; | |
428 | e820.nr_map++; | |
429 | } | |
430 | } /* add_memory_region */ | |
431 | ||
432 | #define E820_DEBUG 1 | |
433 | ||
434 | static void __init print_memory_map(char *who) | |
435 | { | |
436 | int i; | |
437 | ||
438 | for (i = 0; i < e820.nr_map; i++) { | |
439 | printk(" %s: %016Lx - %016Lx ", who, | |
440 | e820.map[i].addr, | |
441 | e820.map[i].addr + e820.map[i].size); | |
442 | switch (e820.map[i].type) { | |
443 | case E820_RAM: printk("(usable)\n"); | |
444 | break; | |
445 | case E820_RESERVED: | |
446 | printk("(reserved)\n"); | |
447 | break; | |
448 | case E820_ACPI: | |
449 | printk("(ACPI data)\n"); | |
450 | break; | |
451 | case E820_NVS: | |
452 | printk("(ACPI NVS)\n"); | |
453 | break; | |
454 | default: printk("type %lu\n", e820.map[i].type); | |
455 | break; | |
456 | } | |
457 | } | |
458 | } | |
459 | ||
460 | /* | |
461 | * Sanitize the BIOS e820 map. | |
462 | * | |
463 | * Some e820 responses include overlapping entries. The following | |
464 | * replaces the original e820 map with a new one, removing overlaps. | |
465 | * | |
466 | */ | |
467 | struct change_member { | |
468 | struct e820entry *pbios; /* pointer to original bios entry */ | |
469 | unsigned long long addr; /* address for this change point */ | |
470 | }; | |
471 | static struct change_member change_point_list[2*E820MAX] __initdata; | |
472 | static struct change_member *change_point[2*E820MAX] __initdata; | |
473 | static struct e820entry *overlap_list[E820MAX] __initdata; | |
474 | static struct e820entry new_bios[E820MAX] __initdata; | |
475 | ||
e75eac33 | 476 | int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map) |
1da177e4 LT |
477 | { |
478 | struct change_member *change_tmp; | |
479 | unsigned long current_type, last_type; | |
480 | unsigned long long last_addr; | |
481 | int chgidx, still_changing; | |
482 | int overlap_entries; | |
483 | int new_bios_entry; | |
484 | int old_nr, new_nr, chg_nr; | |
485 | int i; | |
486 | ||
487 | /* | |
488 | Visually we're performing the following (1,2,3,4 = memory types)... | |
489 | ||
490 | Sample memory map (w/overlaps): | |
491 | ____22__________________ | |
492 | ______________________4_ | |
493 | ____1111________________ | |
494 | _44_____________________ | |
495 | 11111111________________ | |
496 | ____________________33__ | |
497 | ___________44___________ | |
498 | __________33333_________ | |
499 | ______________22________ | |
500 | ___________________2222_ | |
501 | _________111111111______ | |
502 | _____________________11_ | |
503 | _________________4______ | |
504 | ||
505 | Sanitized equivalent (no overlap): | |
506 | 1_______________________ | |
507 | _44_____________________ | |
508 | ___1____________________ | |
509 | ____22__________________ | |
510 | ______11________________ | |
511 | _________1______________ | |
512 | __________3_____________ | |
513 | ___________44___________ | |
514 | _____________33_________ | |
515 | _______________2________ | |
516 | ________________1_______ | |
517 | _________________4______ | |
518 | ___________________2____ | |
519 | ____________________33__ | |
520 | ______________________4_ | |
521 | */ | |
522 | ||
523 | /* if there's only one memory region, don't bother */ | |
524 | if (*pnr_map < 2) | |
525 | return -1; | |
526 | ||
527 | old_nr = *pnr_map; | |
528 | ||
529 | /* bail out if we find any unreasonable addresses in bios map */ | |
530 | for (i=0; i<old_nr; i++) | |
531 | if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) | |
532 | return -1; | |
533 | ||
534 | /* create pointers for initial change-point information (for sorting) */ | |
535 | for (i=0; i < 2*old_nr; i++) | |
536 | change_point[i] = &change_point_list[i]; | |
537 | ||
538 | /* record all known change-points (starting and ending addresses), | |
539 | omitting those that are for empty memory regions */ | |
540 | chgidx = 0; | |
541 | for (i=0; i < old_nr; i++) { | |
542 | if (biosmap[i].size != 0) { | |
543 | change_point[chgidx]->addr = biosmap[i].addr; | |
544 | change_point[chgidx++]->pbios = &biosmap[i]; | |
545 | change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size; | |
546 | change_point[chgidx++]->pbios = &biosmap[i]; | |
547 | } | |
548 | } | |
549 | chg_nr = chgidx; /* true number of change-points */ | |
550 | ||
551 | /* sort change-point list by memory addresses (low -> high) */ | |
552 | still_changing = 1; | |
553 | while (still_changing) { | |
554 | still_changing = 0; | |
555 | for (i=1; i < chg_nr; i++) { | |
556 | /* if <current_addr> > <last_addr>, swap */ | |
557 | /* or, if current=<start_addr> & last=<end_addr>, swap */ | |
558 | if ((change_point[i]->addr < change_point[i-1]->addr) || | |
559 | ((change_point[i]->addr == change_point[i-1]->addr) && | |
560 | (change_point[i]->addr == change_point[i]->pbios->addr) && | |
561 | (change_point[i-1]->addr != change_point[i-1]->pbios->addr)) | |
562 | ) | |
563 | { | |
564 | change_tmp = change_point[i]; | |
565 | change_point[i] = change_point[i-1]; | |
566 | change_point[i-1] = change_tmp; | |
567 | still_changing=1; | |
568 | } | |
569 | } | |
570 | } | |
571 | ||
572 | /* create a new bios memory map, removing overlaps */ | |
573 | overlap_entries=0; /* number of entries in the overlap table */ | |
574 | new_bios_entry=0; /* index for creating new bios map entries */ | |
575 | last_type = 0; /* start with undefined memory type */ | |
576 | last_addr = 0; /* start with 0 as last starting address */ | |
577 | /* loop through change-points, determining affect on the new bios map */ | |
578 | for (chgidx=0; chgidx < chg_nr; chgidx++) | |
579 | { | |
580 | /* keep track of all overlapping bios entries */ | |
581 | if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr) | |
582 | { | |
583 | /* add map entry to overlap list (> 1 entry implies an overlap) */ | |
584 | overlap_list[overlap_entries++]=change_point[chgidx]->pbios; | |
585 | } | |
586 | else | |
587 | { | |
588 | /* remove entry from list (order independent, so swap with last) */ | |
589 | for (i=0; i<overlap_entries; i++) | |
590 | { | |
591 | if (overlap_list[i] == change_point[chgidx]->pbios) | |
592 | overlap_list[i] = overlap_list[overlap_entries-1]; | |
593 | } | |
594 | overlap_entries--; | |
595 | } | |
596 | /* if there are overlapping entries, decide which "type" to use */ | |
597 | /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */ | |
598 | current_type = 0; | |
599 | for (i=0; i<overlap_entries; i++) | |
600 | if (overlap_list[i]->type > current_type) | |
601 | current_type = overlap_list[i]->type; | |
602 | /* continue building up new bios map based on this information */ | |
603 | if (current_type != last_type) { | |
604 | if (last_type != 0) { | |
605 | new_bios[new_bios_entry].size = | |
606 | change_point[chgidx]->addr - last_addr; | |
607 | /* move forward only if the new size was non-zero */ | |
608 | if (new_bios[new_bios_entry].size != 0) | |
609 | if (++new_bios_entry >= E820MAX) | |
610 | break; /* no more space left for new bios entries */ | |
611 | } | |
612 | if (current_type != 0) { | |
613 | new_bios[new_bios_entry].addr = change_point[chgidx]->addr; | |
614 | new_bios[new_bios_entry].type = current_type; | |
615 | last_addr=change_point[chgidx]->addr; | |
616 | } | |
617 | last_type = current_type; | |
618 | } | |
619 | } | |
620 | new_nr = new_bios_entry; /* retain count for new bios entries */ | |
621 | ||
622 | /* copy new bios mapping into original location */ | |
623 | memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry)); | |
624 | *pnr_map = new_nr; | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | /* | |
630 | * Copy the BIOS e820 map into a safe place. | |
631 | * | |
632 | * Sanity-check it while we're at it.. | |
633 | * | |
634 | * If we're lucky and live on a modern system, the setup code | |
635 | * will have given us a memory map that we can use to properly | |
636 | * set up memory. If we aren't, we'll fake a memory map. | |
637 | * | |
638 | * We check to see that the memory map contains at least 2 elements | |
639 | * before we'll use it, because the detection code in setup.S may | |
640 | * not be perfect and most every PC known to man has two memory | |
641 | * regions: one from 0 to 640k, and one from 1mb up. (The IBM | |
642 | * thinkpad 560x, for example, does not cooperate with the memory | |
643 | * detection code.) | |
644 | */ | |
e75eac33 | 645 | int __init copy_e820_map(struct e820entry * biosmap, int nr_map) |
1da177e4 LT |
646 | { |
647 | /* Only one memory region (or negative)? Ignore it */ | |
648 | if (nr_map < 2) | |
649 | return -1; | |
650 | ||
651 | do { | |
652 | unsigned long long start = biosmap->addr; | |
653 | unsigned long long size = biosmap->size; | |
654 | unsigned long long end = start + size; | |
655 | unsigned long type = biosmap->type; | |
656 | ||
657 | /* Overflow in 64 bits? Ignore the memory map. */ | |
658 | if (start > end) | |
659 | return -1; | |
660 | ||
661 | /* | |
662 | * Some BIOSes claim RAM in the 640k - 1M region. | |
663 | * Not right. Fix it up. | |
664 | */ | |
665 | if (type == E820_RAM) { | |
666 | if (start < 0x100000ULL && end > 0xA0000ULL) { | |
667 | if (start < 0xA0000ULL) | |
668 | add_memory_region(start, 0xA0000ULL-start, type); | |
669 | if (end <= 0x100000ULL) | |
670 | continue; | |
671 | start = 0x100000ULL; | |
672 | size = end - start; | |
673 | } | |
674 | } | |
675 | add_memory_region(start, size, type); | |
676 | } while (biosmap++,--nr_map); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) | |
681 | struct edd edd; | |
682 | #ifdef CONFIG_EDD_MODULE | |
683 | EXPORT_SYMBOL(edd); | |
684 | #endif | |
685 | /** | |
686 | * copy_edd() - Copy the BIOS EDD information | |
687 | * from boot_params into a safe place. | |
688 | * | |
689 | */ | |
690 | static inline void copy_edd(void) | |
691 | { | |
692 | memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature)); | |
693 | memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info)); | |
694 | edd.mbr_signature_nr = EDD_MBR_SIG_NR; | |
695 | edd.edd_info_nr = EDD_NR; | |
696 | } | |
697 | #else | |
698 | static inline void copy_edd(void) | |
699 | { | |
700 | } | |
701 | #endif | |
702 | ||
1da177e4 LT |
703 | static void __init parse_cmdline_early (char ** cmdline_p) |
704 | { | |
705 | char c = ' ', *to = command_line, *from = saved_command_line; | |
706 | int len = 0; | |
707 | int userdef = 0; | |
708 | ||
709 | /* Save unparsed command line copy for /proc/cmdline */ | |
710 | saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; | |
711 | ||
712 | for (;;) { | |
713 | if (c != ' ') | |
714 | goto next_char; | |
715 | /* | |
716 | * "mem=nopentium" disables the 4MB page tables. | |
717 | * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM | |
718 | * to <mem>, overriding the bios size. | |
719 | * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from | |
720 | * <start> to <start>+<mem>, overriding the bios size. | |
721 | * | |
722 | * HPA tells me bootloaders need to parse mem=, so no new | |
723 | * option should be mem= [also see Documentation/i386/boot.txt] | |
724 | */ | |
725 | if (!memcmp(from, "mem=", 4)) { | |
726 | if (to != command_line) | |
727 | to--; | |
728 | if (!memcmp(from+4, "nopentium", 9)) { | |
729 | from += 9+4; | |
730 | clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability); | |
731 | disable_pse = 1; | |
732 | } else { | |
733 | /* If the user specifies memory size, we | |
734 | * limit the BIOS-provided memory map to | |
735 | * that size. exactmap can be used to specify | |
736 | * the exact map. mem=number can be used to | |
737 | * trim the existing memory map. | |
738 | */ | |
739 | unsigned long long mem_size; | |
740 | ||
741 | mem_size = memparse(from+4, &from); | |
742 | limit_regions(mem_size); | |
743 | userdef=1; | |
744 | } | |
745 | } | |
746 | ||
747 | else if (!memcmp(from, "memmap=", 7)) { | |
748 | if (to != command_line) | |
749 | to--; | |
750 | if (!memcmp(from+7, "exactmap", 8)) { | |
92aa63a5 VG |
751 | #ifdef CONFIG_CRASH_DUMP |
752 | /* If we are doing a crash dump, we | |
753 | * still need to know the real mem | |
754 | * size before original memory map is | |
755 | * reset. | |
756 | */ | |
757 | find_max_pfn(); | |
758 | saved_max_pfn = max_pfn; | |
759 | #endif | |
1da177e4 LT |
760 | from += 8+7; |
761 | e820.nr_map = 0; | |
762 | userdef = 1; | |
763 | } else { | |
764 | /* If the user specifies memory size, we | |
765 | * limit the BIOS-provided memory map to | |
766 | * that size. exactmap can be used to specify | |
767 | * the exact map. mem=number can be used to | |
768 | * trim the existing memory map. | |
769 | */ | |
770 | unsigned long long start_at, mem_size; | |
771 | ||
772 | mem_size = memparse(from+7, &from); | |
773 | if (*from == '@') { | |
774 | start_at = memparse(from+1, &from); | |
775 | add_memory_region(start_at, mem_size, E820_RAM); | |
776 | } else if (*from == '#') { | |
777 | start_at = memparse(from+1, &from); | |
778 | add_memory_region(start_at, mem_size, E820_ACPI); | |
779 | } else if (*from == '$') { | |
780 | start_at = memparse(from+1, &from); | |
781 | add_memory_region(start_at, mem_size, E820_RESERVED); | |
782 | } else { | |
783 | limit_regions(mem_size); | |
784 | userdef=1; | |
785 | } | |
786 | } | |
787 | } | |
788 | ||
789 | else if (!memcmp(from, "noexec=", 7)) | |
790 | noexec_setup(from + 7); | |
791 | ||
792 | ||
793 | #ifdef CONFIG_X86_SMP | |
794 | /* | |
795 | * If the BIOS enumerates physical processors before logical, | |
796 | * maxcpus=N at enumeration-time can be used to disable HT. | |
797 | */ | |
798 | else if (!memcmp(from, "maxcpus=", 8)) { | |
799 | extern unsigned int maxcpus; | |
800 | ||
801 | maxcpus = simple_strtoul(from + 8, NULL, 0); | |
802 | } | |
803 | #endif | |
804 | ||
888ba6c6 | 805 | #ifdef CONFIG_ACPI |
1da177e4 LT |
806 | /* "acpi=off" disables both ACPI table parsing and interpreter */ |
807 | else if (!memcmp(from, "acpi=off", 8)) { | |
808 | disable_acpi(); | |
809 | } | |
810 | ||
811 | /* acpi=force to over-ride black-list */ | |
812 | else if (!memcmp(from, "acpi=force", 10)) { | |
813 | acpi_force = 1; | |
814 | acpi_ht = 1; | |
815 | acpi_disabled = 0; | |
816 | } | |
817 | ||
818 | /* acpi=strict disables out-of-spec workarounds */ | |
819 | else if (!memcmp(from, "acpi=strict", 11)) { | |
820 | acpi_strict = 1; | |
821 | } | |
822 | ||
823 | /* Limit ACPI just to boot-time to enable HT */ | |
824 | else if (!memcmp(from, "acpi=ht", 7)) { | |
825 | if (!acpi_force) | |
826 | disable_acpi(); | |
827 | acpi_ht = 1; | |
828 | } | |
829 | ||
830 | /* "pci=noacpi" disable ACPI IRQ routing and PCI scan */ | |
831 | else if (!memcmp(from, "pci=noacpi", 10)) { | |
832 | acpi_disable_pci(); | |
833 | } | |
834 | /* "acpi=noirq" disables ACPI interrupt routing */ | |
835 | else if (!memcmp(from, "acpi=noirq", 10)) { | |
836 | acpi_noirq_set(); | |
837 | } | |
838 | ||
839 | else if (!memcmp(from, "acpi_sci=edge", 13)) | |
840 | acpi_sci_flags.trigger = 1; | |
841 | ||
842 | else if (!memcmp(from, "acpi_sci=level", 14)) | |
843 | acpi_sci_flags.trigger = 3; | |
844 | ||
845 | else if (!memcmp(from, "acpi_sci=high", 13)) | |
846 | acpi_sci_flags.polarity = 1; | |
847 | ||
848 | else if (!memcmp(from, "acpi_sci=low", 12)) | |
849 | acpi_sci_flags.polarity = 3; | |
850 | ||
851 | #ifdef CONFIG_X86_IO_APIC | |
852 | else if (!memcmp(from, "acpi_skip_timer_override", 24)) | |
853 | acpi_skip_timer_override = 1; | |
1da177e4 | 854 | |
66759a01 CE |
855 | if (!memcmp(from, "disable_timer_pin_1", 19)) |
856 | disable_timer_pin_1 = 1; | |
857 | if (!memcmp(from, "enable_timer_pin_1", 18)) | |
858 | disable_timer_pin_1 = -1; | |
859 | ||
1da177e4 LT |
860 | /* disable IO-APIC */ |
861 | else if (!memcmp(from, "noapic", 6)) | |
862 | disable_ioapic_setup(); | |
0a305d2e | 863 | #endif /* CONFIG_X86_IO_APIC */ |
888ba6c6 | 864 | #endif /* CONFIG_ACPI */ |
1da177e4 | 865 | |
9635b47d EB |
866 | #ifdef CONFIG_X86_LOCAL_APIC |
867 | /* enable local APIC */ | |
868 | else if (!memcmp(from, "lapic", 5)) | |
869 | lapic_enable(); | |
870 | ||
871 | /* disable local APIC */ | |
872 | else if (!memcmp(from, "nolapic", 6)) | |
873 | lapic_disable(); | |
874 | #endif /* CONFIG_X86_LOCAL_APIC */ | |
875 | ||
1bc3b91a EB |
876 | #ifdef CONFIG_KEXEC |
877 | /* crashkernel=size@addr specifies the location to reserve for | |
878 | * a crash kernel. By reserving this memory we guarantee | |
879 | * that linux never set's it up as a DMA target. | |
880 | * Useful for holding code to do something appropriate | |
881 | * after a kernel panic. | |
882 | */ | |
883 | else if (!memcmp(from, "crashkernel=", 12)) { | |
884 | unsigned long size, base; | |
885 | size = memparse(from+12, &from); | |
886 | if (*from == '@') { | |
887 | base = memparse(from+1, &from); | |
888 | /* FIXME: Do I want a sanity check | |
889 | * to validate the memory range? | |
890 | */ | |
891 | crashk_res.start = base; | |
892 | crashk_res.end = base + size - 1; | |
893 | } | |
894 | } | |
895 | #endif | |
aac04b32 | 896 | #ifdef CONFIG_PROC_VMCORE |
2030eae5 VG |
897 | /* elfcorehdr= specifies the location of elf core header |
898 | * stored by the crashed kernel. | |
899 | */ | |
900 | else if (!memcmp(from, "elfcorehdr=", 11)) | |
901 | elfcorehdr_addr = memparse(from+11, &from); | |
902 | #endif | |
1bc3b91a | 903 | |
1da177e4 LT |
904 | /* |
905 | * highmem=size forces highmem to be exactly 'size' bytes. | |
906 | * This works even on boxes that have no highmem otherwise. | |
907 | * This also works to reduce highmem size on bigger boxes. | |
908 | */ | |
909 | else if (!memcmp(from, "highmem=", 8)) | |
910 | highmem_pages = memparse(from+8, &from) >> PAGE_SHIFT; | |
911 | ||
912 | /* | |
913 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
914 | * bytes. This can be used to increase (or decrease) the | |
915 | * vmalloc area - the default is 128m. | |
916 | */ | |
917 | else if (!memcmp(from, "vmalloc=", 8)) | |
918 | __VMALLOC_RESERVE = memparse(from+8, &from); | |
919 | ||
920 | next_char: | |
921 | c = *(from++); | |
922 | if (!c) | |
923 | break; | |
924 | if (COMMAND_LINE_SIZE <= ++len) | |
925 | break; | |
926 | *(to++) = c; | |
927 | } | |
928 | *to = '\0'; | |
929 | *cmdline_p = command_line; | |
930 | if (userdef) { | |
931 | printk(KERN_INFO "user-defined physical RAM map:\n"); | |
932 | print_memory_map("user"); | |
933 | } | |
934 | } | |
935 | ||
936 | /* | |
937 | * Callback for efi_memory_walk. | |
938 | */ | |
939 | static int __init | |
940 | efi_find_max_pfn(unsigned long start, unsigned long end, void *arg) | |
941 | { | |
942 | unsigned long *max_pfn = arg, pfn; | |
943 | ||
944 | if (start < end) { | |
945 | pfn = PFN_UP(end -1); | |
946 | if (pfn > *max_pfn) | |
947 | *max_pfn = pfn; | |
948 | } | |
949 | return 0; | |
950 | } | |
951 | ||
215c3409 AW |
952 | static int __init |
953 | efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg) | |
954 | { | |
955 | memory_present(0, start, end); | |
956 | return 0; | |
957 | } | |
1da177e4 | 958 | |
79e453d4 LT |
959 | /* |
960 | * This function checks if the entire range <start,end> is mapped with type. | |
961 | * | |
962 | * Note: this function only works correct if the e820 table is sorted and | |
963 | * not-overlapping, which is the case | |
964 | */ | |
965 | int __init | |
966 | e820_all_mapped(unsigned long s, unsigned long e, unsigned type) | |
967 | { | |
968 | u64 start = s; | |
969 | u64 end = e; | |
970 | int i; | |
971 | for (i = 0; i < e820.nr_map; i++) { | |
972 | struct e820entry *ei = &e820.map[i]; | |
973 | if (type && ei->type != type) | |
974 | continue; | |
975 | /* is the region (part) in overlap with the current region ?*/ | |
976 | if (ei->addr >= end || ei->addr + ei->size <= start) | |
977 | continue; | |
978 | /* if the region is at the beginning of <start,end> we move | |
979 | * start to the end of the region since it's ok until there | |
980 | */ | |
981 | if (ei->addr <= start) | |
982 | start = ei->addr + ei->size; | |
983 | /* if start is now at or beyond end, we're done, full | |
984 | * coverage */ | |
985 | if (start >= end) | |
986 | return 1; /* we're done */ | |
987 | } | |
988 | return 0; | |
989 | } | |
990 | ||
1da177e4 LT |
991 | /* |
992 | * Find the highest page frame number we have available | |
993 | */ | |
994 | void __init find_max_pfn(void) | |
995 | { | |
996 | int i; | |
997 | ||
998 | max_pfn = 0; | |
999 | if (efi_enabled) { | |
1000 | efi_memmap_walk(efi_find_max_pfn, &max_pfn); | |
215c3409 | 1001 | efi_memmap_walk(efi_memory_present_wrapper, NULL); |
1da177e4 LT |
1002 | return; |
1003 | } | |
1004 | ||
1005 | for (i = 0; i < e820.nr_map; i++) { | |
1006 | unsigned long start, end; | |
1007 | /* RAM? */ | |
1008 | if (e820.map[i].type != E820_RAM) | |
1009 | continue; | |
1010 | start = PFN_UP(e820.map[i].addr); | |
1011 | end = PFN_DOWN(e820.map[i].addr + e820.map[i].size); | |
1012 | if (start >= end) | |
1013 | continue; | |
1014 | if (end > max_pfn) | |
1015 | max_pfn = end; | |
215c3409 | 1016 | memory_present(0, start, end); |
1da177e4 LT |
1017 | } |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * Determine low and high memory ranges: | |
1022 | */ | |
1023 | unsigned long __init find_max_low_pfn(void) | |
1024 | { | |
1025 | unsigned long max_low_pfn; | |
1026 | ||
1027 | max_low_pfn = max_pfn; | |
1028 | if (max_low_pfn > MAXMEM_PFN) { | |
1029 | if (highmem_pages == -1) | |
1030 | highmem_pages = max_pfn - MAXMEM_PFN; | |
1031 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
1032 | max_pfn = MAXMEM_PFN + highmem_pages; | |
1033 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
1034 | printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages)); | |
1035 | highmem_pages = 0; | |
1036 | } | |
1037 | max_low_pfn = MAXMEM_PFN; | |
1038 | #ifndef CONFIG_HIGHMEM | |
1039 | /* Maximum memory usable is what is directly addressable */ | |
1040 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", | |
1041 | MAXMEM>>20); | |
1042 | if (max_pfn > MAX_NONPAE_PFN) | |
1043 | printk(KERN_WARNING "Use a PAE enabled kernel.\n"); | |
1044 | else | |
1045 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
1046 | max_pfn = MAXMEM_PFN; | |
1047 | #else /* !CONFIG_HIGHMEM */ | |
1048 | #ifndef CONFIG_X86_PAE | |
1049 | if (max_pfn > MAX_NONPAE_PFN) { | |
1050 | max_pfn = MAX_NONPAE_PFN; | |
1051 | printk(KERN_WARNING "Warning only 4GB will be used.\n"); | |
1052 | printk(KERN_WARNING "Use a PAE enabled kernel.\n"); | |
1053 | } | |
1054 | #endif /* !CONFIG_X86_PAE */ | |
1055 | #endif /* !CONFIG_HIGHMEM */ | |
1056 | } else { | |
1057 | if (highmem_pages == -1) | |
1058 | highmem_pages = 0; | |
1059 | #ifdef CONFIG_HIGHMEM | |
1060 | if (highmem_pages >= max_pfn) { | |
1061 | printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
1062 | highmem_pages = 0; | |
1063 | } | |
1064 | if (highmem_pages) { | |
1065 | if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){ | |
1066 | printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages)); | |
1067 | highmem_pages = 0; | |
1068 | } | |
1069 | max_low_pfn -= highmem_pages; | |
1070 | } | |
1071 | #else | |
1072 | if (highmem_pages) | |
1073 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
1074 | #endif | |
1075 | } | |
1076 | return max_low_pfn; | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Free all available memory for boot time allocation. Used | |
1081 | * as a callback function by efi_memory_walk() | |
1082 | */ | |
1083 | ||
1084 | static int __init | |
1085 | free_available_memory(unsigned long start, unsigned long end, void *arg) | |
1086 | { | |
1087 | /* check max_low_pfn */ | |
23dd842c | 1088 | if (start >= (max_low_pfn << PAGE_SHIFT)) |
1da177e4 | 1089 | return 0; |
23dd842c TM |
1090 | if (end >= (max_low_pfn << PAGE_SHIFT)) |
1091 | end = max_low_pfn << PAGE_SHIFT; | |
1da177e4 LT |
1092 | if (start < end) |
1093 | free_bootmem(start, end - start); | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | /* | |
1098 | * Register fully available low RAM pages with the bootmem allocator. | |
1099 | */ | |
1100 | static void __init register_bootmem_low_pages(unsigned long max_low_pfn) | |
1101 | { | |
1102 | int i; | |
1103 | ||
1104 | if (efi_enabled) { | |
1105 | efi_memmap_walk(free_available_memory, NULL); | |
1106 | return; | |
1107 | } | |
1108 | for (i = 0; i < e820.nr_map; i++) { | |
1109 | unsigned long curr_pfn, last_pfn, size; | |
1110 | /* | |
1111 | * Reserve usable low memory | |
1112 | */ | |
1113 | if (e820.map[i].type != E820_RAM) | |
1114 | continue; | |
1115 | /* | |
1116 | * We are rounding up the start address of usable memory: | |
1117 | */ | |
1118 | curr_pfn = PFN_UP(e820.map[i].addr); | |
1119 | if (curr_pfn >= max_low_pfn) | |
1120 | continue; | |
1121 | /* | |
1122 | * ... and at the end of the usable range downwards: | |
1123 | */ | |
1124 | last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size); | |
1125 | ||
1126 | if (last_pfn > max_low_pfn) | |
1127 | last_pfn = max_low_pfn; | |
1128 | ||
1129 | /* | |
1130 | * .. finally, did all the rounding and playing | |
1131 | * around just make the area go away? | |
1132 | */ | |
1133 | if (last_pfn <= curr_pfn) | |
1134 | continue; | |
1135 | ||
1136 | size = last_pfn - curr_pfn; | |
1137 | free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * workaround for Dell systems that neglect to reserve EBDA | |
1143 | */ | |
1144 | static void __init reserve_ebda_region(void) | |
1145 | { | |
1146 | unsigned int addr; | |
1147 | addr = get_bios_ebda(); | |
1148 | if (addr) | |
1149 | reserve_bootmem(addr, PAGE_SIZE); | |
1150 | } | |
1151 | ||
05b79bdc | 1152 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
1153 | void __init setup_bootmem_allocator(void); |
1154 | static unsigned long __init setup_memory(void) | |
1155 | { | |
1156 | /* | |
1157 | * partially used pages are not usable - thus | |
1158 | * we are rounding upwards: | |
1159 | */ | |
1160 | min_low_pfn = PFN_UP(init_pg_tables_end); | |
1161 | ||
1162 | find_max_pfn(); | |
1163 | ||
1164 | max_low_pfn = find_max_low_pfn(); | |
1165 | ||
1166 | #ifdef CONFIG_HIGHMEM | |
1167 | highstart_pfn = highend_pfn = max_pfn; | |
1168 | if (max_pfn > max_low_pfn) { | |
1169 | highstart_pfn = max_low_pfn; | |
1170 | } | |
1171 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", | |
1172 | pages_to_mb(highend_pfn - highstart_pfn)); | |
1173 | #endif | |
1174 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", | |
1175 | pages_to_mb(max_low_pfn)); | |
1176 | ||
1177 | setup_bootmem_allocator(); | |
1178 | ||
1179 | return max_low_pfn; | |
1180 | } | |
1181 | ||
1182 | void __init zone_sizes_init(void) | |
1183 | { | |
1184 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; | |
1185 | unsigned int max_dma, low; | |
1186 | ||
1187 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
1188 | low = max_low_pfn; | |
1189 | ||
1190 | if (low < max_dma) | |
1191 | zones_size[ZONE_DMA] = low; | |
1192 | else { | |
1193 | zones_size[ZONE_DMA] = max_dma; | |
1194 | zones_size[ZONE_NORMAL] = low - max_dma; | |
1195 | #ifdef CONFIG_HIGHMEM | |
1196 | zones_size[ZONE_HIGHMEM] = highend_pfn - low; | |
1197 | #endif | |
1198 | } | |
1199 | free_area_init(zones_size); | |
1200 | } | |
1201 | #else | |
05b79bdc | 1202 | extern unsigned long __init setup_memory(void); |
1da177e4 | 1203 | extern void zone_sizes_init(void); |
05b79bdc | 1204 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 LT |
1205 | |
1206 | void __init setup_bootmem_allocator(void) | |
1207 | { | |
1208 | unsigned long bootmap_size; | |
1209 | /* | |
1210 | * Initialize the boot-time allocator (with low memory only): | |
1211 | */ | |
1212 | bootmap_size = init_bootmem(min_low_pfn, max_low_pfn); | |
1213 | ||
1214 | register_bootmem_low_pages(max_low_pfn); | |
1215 | ||
1216 | /* | |
1217 | * Reserve the bootmem bitmap itself as well. We do this in two | |
1218 | * steps (first step was init_bootmem()) because this catches | |
1219 | * the (very unlikely) case of us accidentally initializing the | |
1220 | * bootmem allocator with an invalid RAM area. | |
1221 | */ | |
8a919085 VG |
1222 | reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) + |
1223 | bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START)); | |
1da177e4 LT |
1224 | |
1225 | /* | |
1226 | * reserve physical page 0 - it's a special BIOS page on many boxes, | |
1227 | * enabling clean reboots, SMP operation, laptop functions. | |
1228 | */ | |
1229 | reserve_bootmem(0, PAGE_SIZE); | |
1230 | ||
1231 | /* reserve EBDA region, it's a 4K region */ | |
1232 | reserve_ebda_region(); | |
1233 | ||
1234 | /* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent | |
1235 | PCI prefetch into it (errata #56). Usually the page is reserved anyways, | |
1236 | unless you have no PS/2 mouse plugged in. */ | |
1237 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
1238 | boot_cpu_data.x86 == 6) | |
1239 | reserve_bootmem(0xa0000 - 4096, 4096); | |
1240 | ||
1241 | #ifdef CONFIG_SMP | |
1242 | /* | |
1243 | * But first pinch a few for the stack/trampoline stuff | |
1244 | * FIXME: Don't need the extra page at 4K, but need to fix | |
1245 | * trampoline before removing it. (see the GDT stuff) | |
1246 | */ | |
1247 | reserve_bootmem(PAGE_SIZE, PAGE_SIZE); | |
1248 | #endif | |
1249 | #ifdef CONFIG_ACPI_SLEEP | |
1250 | /* | |
1251 | * Reserve low memory region for sleep support. | |
1252 | */ | |
1253 | acpi_reserve_bootmem(); | |
1254 | #endif | |
1255 | #ifdef CONFIG_X86_FIND_SMP_CONFIG | |
1256 | /* | |
1257 | * Find and reserve possible boot-time SMP configuration: | |
1258 | */ | |
1259 | find_smp_config(); | |
1260 | #endif | |
1261 | ||
1262 | #ifdef CONFIG_BLK_DEV_INITRD | |
1263 | if (LOADER_TYPE && INITRD_START) { | |
1264 | if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { | |
1265 | reserve_bootmem(INITRD_START, INITRD_SIZE); | |
1266 | initrd_start = | |
1267 | INITRD_START ? INITRD_START + PAGE_OFFSET : 0; | |
1268 | initrd_end = initrd_start+INITRD_SIZE; | |
1269 | } | |
1270 | else { | |
1271 | printk(KERN_ERR "initrd extends beyond end of memory " | |
1272 | "(0x%08lx > 0x%08lx)\ndisabling initrd\n", | |
1273 | INITRD_START + INITRD_SIZE, | |
1274 | max_low_pfn << PAGE_SHIFT); | |
1275 | initrd_start = 0; | |
1276 | } | |
1277 | } | |
1278 | #endif | |
1bc3b91a EB |
1279 | #ifdef CONFIG_KEXEC |
1280 | if (crashk_res.start != crashk_res.end) | |
1281 | reserve_bootmem(crashk_res.start, | |
1282 | crashk_res.end - crashk_res.start + 1); | |
1283 | #endif | |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | /* | |
1287 | * The node 0 pgdat is initialized before all of these because | |
1288 | * it's needed for bootmem. node>0 pgdats have their virtual | |
1289 | * space allocated before the pagetables are in place to access | |
1290 | * them, so they can't be cleared then. | |
1291 | * | |
1292 | * This should all compile down to nothing when NUMA is off. | |
1293 | */ | |
1294 | void __init remapped_pgdat_init(void) | |
1295 | { | |
1296 | int nid; | |
1297 | ||
1298 | for_each_online_node(nid) { | |
1299 | if (nid != 0) | |
1300 | memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Request address space for all standard RAM and ROM resources | |
1306 | * and also for regions reported as reserved by the e820. | |
1307 | */ | |
1308 | static void __init | |
1309 | legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource) | |
1310 | { | |
1311 | int i; | |
1312 | ||
1313 | probe_roms(); | |
1314 | for (i = 0; i < e820.nr_map; i++) { | |
1315 | struct resource *res; | |
87937472 | 1316 | #ifndef CONFIG_RESOURCES_64BIT |
9be2f7c3 LT |
1317 | if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL) |
1318 | continue; | |
87937472 | 1319 | #endif |
b408cbc7 | 1320 | res = kzalloc(sizeof(struct resource), GFP_ATOMIC); |
1da177e4 LT |
1321 | switch (e820.map[i].type) { |
1322 | case E820_RAM: res->name = "System RAM"; break; | |
1323 | case E820_ACPI: res->name = "ACPI Tables"; break; | |
1324 | case E820_NVS: res->name = "ACPI Non-volatile Storage"; break; | |
1325 | default: res->name = "reserved"; | |
1326 | } | |
1327 | res->start = e820.map[i].addr; | |
1328 | res->end = res->start + e820.map[i].size - 1; | |
1329 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
a7546075 CM |
1330 | if (request_resource(&iomem_resource, res)) { |
1331 | kfree(res); | |
1332 | continue; | |
1333 | } | |
1da177e4 LT |
1334 | if (e820.map[i].type == E820_RAM) { |
1335 | /* | |
1336 | * We don't know which RAM region contains kernel data, | |
1337 | * so we try it repeatedly and let the resource manager | |
1338 | * test it. | |
1339 | */ | |
1340 | request_resource(res, code_resource); | |
1341 | request_resource(res, data_resource); | |
1bc3b91a EB |
1342 | #ifdef CONFIG_KEXEC |
1343 | request_resource(res, &crashk_res); | |
1344 | #endif | |
1da177e4 LT |
1345 | } |
1346 | } | |
1347 | } | |
1348 | ||
1349 | /* | |
1350 | * Request address space for all standard resources | |
b408cbc7 | 1351 | * |
66004a6c LT |
1352 | * This is called just before pcibios_init(), which is also a |
1353 | * subsys_initcall, but is linked in later (in arch/i386/pci/common.c). | |
1da177e4 | 1354 | */ |
b408cbc7 | 1355 | static int __init request_standard_resources(void) |
1da177e4 | 1356 | { |
b408cbc7 | 1357 | int i; |
1da177e4 | 1358 | |
b408cbc7 | 1359 | printk("Setting up standard PCI resources\n"); |
1da177e4 LT |
1360 | if (efi_enabled) |
1361 | efi_initialize_iomem_resources(&code_resource, &data_resource); | |
1362 | else | |
1363 | legacy_init_iomem_resources(&code_resource, &data_resource); | |
1364 | ||
1365 | /* EFI systems may still have VGA */ | |
1366 | request_resource(&iomem_resource, &video_ram_resource); | |
1367 | ||
1368 | /* request I/O space for devices used on all i[345]86 PCs */ | |
1369 | for (i = 0; i < STANDARD_IO_RESOURCES; i++) | |
1370 | request_resource(&ioport_resource, &standard_io_resources[i]); | |
b408cbc7 LT |
1371 | return 0; |
1372 | } | |
1373 | ||
66004a6c | 1374 | subsys_initcall(request_standard_resources); |
b408cbc7 LT |
1375 | |
1376 | static void __init register_memory(void) | |
1377 | { | |
1378 | unsigned long gapstart, gapsize, round; | |
1379 | unsigned long long last; | |
1380 | int i; | |
1da177e4 LT |
1381 | |
1382 | /* | |
1383 | * Search for the bigest gap in the low 32 bits of the e820 | |
1384 | * memory space. | |
1385 | */ | |
1386 | last = 0x100000000ull; | |
1387 | gapstart = 0x10000000; | |
1388 | gapsize = 0x400000; | |
1389 | i = e820.nr_map; | |
1390 | while (--i >= 0) { | |
1391 | unsigned long long start = e820.map[i].addr; | |
1392 | unsigned long long end = start + e820.map[i].size; | |
1393 | ||
1394 | /* | |
1395 | * Since "last" is at most 4GB, we know we'll | |
1396 | * fit in 32 bits if this condition is true | |
1397 | */ | |
1398 | if (last > end) { | |
1399 | unsigned long gap = last - end; | |
1400 | ||
1401 | if (gap > gapsize) { | |
1402 | gapsize = gap; | |
1403 | gapstart = end; | |
1404 | } | |
1405 | } | |
1406 | if (start < last) | |
1407 | last = start; | |
1408 | } | |
1409 | ||
1410 | /* | |
f0eca962 DR |
1411 | * See how much we want to round up: start off with |
1412 | * rounding to the next 1MB area. | |
1da177e4 | 1413 | */ |
f0eca962 DR |
1414 | round = 0x100000; |
1415 | while ((gapsize >> 4) > round) | |
1416 | round += round; | |
1417 | /* Fun with two's complement */ | |
1418 | pci_mem_start = (gapstart + round) & -round; | |
1da177e4 LT |
1419 | |
1420 | printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n", | |
1421 | pci_mem_start, gapstart, gapsize); | |
1422 | } | |
1423 | ||
1da177e4 LT |
1424 | #ifdef CONFIG_MCA |
1425 | static void set_mca_bus(int x) | |
1426 | { | |
1427 | MCA_bus = x; | |
1428 | } | |
1429 | #else | |
1430 | static void set_mca_bus(int x) { } | |
1431 | #endif | |
1432 | ||
1433 | /* | |
1434 | * Determine if we were loaded by an EFI loader. If so, then we have also been | |
1435 | * passed the efi memmap, systab, etc., so we should use these data structures | |
1436 | * for initialization. Note, the efi init code path is determined by the | |
1437 | * global efi_enabled. This allows the same kernel image to be used on existing | |
1438 | * systems (with a traditional BIOS) as well as on EFI systems. | |
1439 | */ | |
1440 | void __init setup_arch(char **cmdline_p) | |
1441 | { | |
1442 | unsigned long max_low_pfn; | |
1443 | ||
1444 | memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); | |
1445 | pre_setup_arch_hook(); | |
1446 | early_cpu_init(); | |
1447 | ||
1448 | /* | |
1449 | * FIXME: This isn't an official loader_type right | |
1450 | * now but does currently work with elilo. | |
1451 | * If we were configured as an EFI kernel, check to make | |
1452 | * sure that we were loaded correctly from elilo and that | |
1453 | * the system table is valid. If not, then initialize normally. | |
1454 | */ | |
1455 | #ifdef CONFIG_EFI | |
1456 | if ((LOADER_TYPE == 0x50) && EFI_SYSTAB) | |
1457 | efi_enabled = 1; | |
1458 | #endif | |
1459 | ||
1460 | ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); | |
1461 | drive_info = DRIVE_INFO; | |
1462 | screen_info = SCREEN_INFO; | |
1463 | edid_info = EDID_INFO; | |
1464 | apm_info.bios = APM_BIOS_INFO; | |
1465 | ist_info = IST_INFO; | |
1466 | saved_videomode = VIDEO_MODE; | |
1467 | if( SYS_DESC_TABLE.length != 0 ) { | |
1468 | set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2); | |
1469 | machine_id = SYS_DESC_TABLE.table[0]; | |
1470 | machine_submodel_id = SYS_DESC_TABLE.table[1]; | |
1471 | BIOS_revision = SYS_DESC_TABLE.table[2]; | |
1472 | } | |
1473 | bootloader_type = LOADER_TYPE; | |
1474 | ||
1475 | #ifdef CONFIG_BLK_DEV_RAM | |
1476 | rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; | |
1477 | rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); | |
1478 | rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); | |
1479 | #endif | |
1480 | ARCH_SETUP | |
1481 | if (efi_enabled) | |
1482 | efi_init(); | |
1483 | else { | |
1484 | printk(KERN_INFO "BIOS-provided physical RAM map:\n"); | |
1485 | print_memory_map(machine_specific_memory_setup()); | |
1486 | } | |
1487 | ||
1488 | copy_edd(); | |
1489 | ||
1490 | if (!MOUNT_ROOT_RDONLY) | |
1491 | root_mountflags &= ~MS_RDONLY; | |
1492 | init_mm.start_code = (unsigned long) _text; | |
1493 | init_mm.end_code = (unsigned long) _etext; | |
1494 | init_mm.end_data = (unsigned long) _edata; | |
1495 | init_mm.brk = init_pg_tables_end + PAGE_OFFSET; | |
1496 | ||
1497 | code_resource.start = virt_to_phys(_text); | |
1498 | code_resource.end = virt_to_phys(_etext)-1; | |
1499 | data_resource.start = virt_to_phys(_etext); | |
1500 | data_resource.end = virt_to_phys(_edata)-1; | |
1501 | ||
1502 | parse_cmdline_early(cmdline_p); | |
1503 | ||
99b7de33 SS |
1504 | #ifdef CONFIG_EARLY_PRINTK |
1505 | { | |
1506 | char *s = strstr(*cmdline_p, "earlyprintk="); | |
1507 | if (s) { | |
1508 | setup_early_printk(strchr(s, '=') + 1); | |
1509 | printk("early console enabled\n"); | |
1510 | } | |
1511 | } | |
1512 | #endif | |
1513 | ||
1da177e4 LT |
1514 | max_low_pfn = setup_memory(); |
1515 | ||
1516 | /* | |
1517 | * NOTE: before this point _nobody_ is allowed to allocate | |
1518 | * any memory using the bootmem allocator. Although the | |
1519 | * alloctor is now initialised only the first 8Mb of the kernel | |
1520 | * virtual address space has been mapped. All allocations before | |
1521 | * paging_init() has completed must use the alloc_bootmem_low_pages() | |
1522 | * variant (which allocates DMA'able memory) and care must be taken | |
1523 | * not to exceed the 8Mb limit. | |
1524 | */ | |
1525 | ||
1526 | #ifdef CONFIG_SMP | |
1527 | smp_alloc_memory(); /* AP processor realmode stacks in low memory*/ | |
1528 | #endif | |
1529 | paging_init(); | |
1530 | remapped_pgdat_init(); | |
05b79bdc | 1531 | sparse_init(); |
1da177e4 LT |
1532 | zone_sizes_init(); |
1533 | ||
1534 | /* | |
1535 | * NOTE: at this point the bootmem allocator is fully available. | |
1536 | */ | |
1537 | ||
1da177e4 LT |
1538 | dmi_scan_machine(); |
1539 | ||
1540 | #ifdef CONFIG_X86_GENERICARCH | |
1541 | generic_apic_probe(*cmdline_p); | |
1542 | #endif | |
1543 | if (efi_enabled) | |
1544 | efi_map_memmap(); | |
1545 | ||
888ba6c6 | 1546 | #ifdef CONFIG_ACPI |
1da177e4 LT |
1547 | /* |
1548 | * Parse the ACPI tables for possible boot-time SMP configuration. | |
1549 | */ | |
1550 | acpi_boot_table_init(); | |
d44647b0 AC |
1551 | #endif |
1552 | ||
1553 | #ifdef CONFIG_X86_IO_APIC | |
1554 | check_acpi_pci(); /* Checks more than just ACPI actually */ | |
1555 | #endif | |
1556 | ||
1557 | #ifdef CONFIG_ACPI | |
1da177e4 LT |
1558 | acpi_boot_init(); |
1559 | ||
911a62d4 VP |
1560 | #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC) |
1561 | if (def_to_bigsmp) | |
1562 | printk(KERN_WARNING "More than 8 CPUs detected and " | |
1563 | "CONFIG_X86_PC cannot handle it.\nUse " | |
1564 | "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n"); | |
1565 | #endif | |
1566 | #endif | |
1da177e4 LT |
1567 | #ifdef CONFIG_X86_LOCAL_APIC |
1568 | if (smp_found_config) | |
1569 | get_smp_config(); | |
1570 | #endif | |
1571 | ||
1572 | register_memory(); | |
1573 | ||
1574 | #ifdef CONFIG_VT | |
1575 | #if defined(CONFIG_VGA_CONSOLE) | |
1576 | if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) | |
1577 | conswitchp = &vga_con; | |
1578 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
1579 | conswitchp = &dummy_con; | |
1580 | #endif | |
1581 | #endif | |
539eb11e | 1582 | tsc_init(); |
1da177e4 LT |
1583 | } |
1584 | ||
e5c6c8e4 MN |
1585 | static __init int add_pcspkr(void) |
1586 | { | |
1587 | struct platform_device *pd; | |
1588 | int ret; | |
1589 | ||
1590 | pd = platform_device_alloc("pcspkr", -1); | |
1591 | if (!pd) | |
1592 | return -ENOMEM; | |
1593 | ||
1594 | ret = platform_device_add(pd); | |
1595 | if (ret) | |
1596 | platform_device_put(pd); | |
1597 | ||
1598 | return ret; | |
1599 | } | |
1600 | device_initcall(add_pcspkr); | |
1601 | ||
1da177e4 LT |
1602 | /* |
1603 | * Local Variables: | |
1604 | * mode:c | |
1605 | * c-file-style:"k&r" | |
1606 | * c-basic-offset:8 | |
1607 | * End: | |
1608 | */ |