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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 | ||
129f6946 | 26 | #include <linux/config.h> |
1da177e4 LT |
27 | #include <linux/sched.h> |
28 | #include <linux/mm.h> | |
05b79bdc | 29 | #include <linux/mmzone.h> |
1da177e4 LT |
30 | #include <linux/tty.h> |
31 | #include <linux/ioport.h> | |
32 | #include <linux/acpi.h> | |
33 | #include <linux/apm_bios.h> | |
34 | #include <linux/initrd.h> | |
35 | #include <linux/bootmem.h> | |
36 | #include <linux/seq_file.h> | |
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> |
1bc3b91a | 49 | |
1da177e4 | 50 | #include <video/edid.h> |
1bc3b91a | 51 | |
9635b47d | 52 | #include <asm/apic.h> |
1da177e4 LT |
53 | #include <asm/e820.h> |
54 | #include <asm/mpspec.h> | |
55 | #include <asm/setup.h> | |
56 | #include <asm/arch_hooks.h> | |
57 | #include <asm/sections.h> | |
58 | #include <asm/io_apic.h> | |
59 | #include <asm/ist.h> | |
60 | #include <asm/io.h> | |
61 | #include "setup_arch_pre.h" | |
62 | #include <bios_ebda.h> | |
63 | ||
92aa63a5 VG |
64 | /* Forward Declaration. */ |
65 | void __init find_max_pfn(void); | |
66 | ||
1da177e4 LT |
67 | /* This value is set up by the early boot code to point to the value |
68 | immediately after the boot time page tables. It contains a *physical* | |
69 | address, and must not be in the .bss segment! */ | |
70 | unsigned long init_pg_tables_end __initdata = ~0UL; | |
71 | ||
0bb3184d | 72 | int disable_pse __devinitdata = 0; |
1da177e4 LT |
73 | |
74 | /* | |
75 | * Machine setup.. | |
76 | */ | |
77 | ||
78 | #ifdef CONFIG_EFI | |
79 | int efi_enabled = 0; | |
80 | EXPORT_SYMBOL(efi_enabled); | |
81 | #endif | |
82 | ||
83 | /* cpu data as detected by the assembly code in head.S */ | |
84 | struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 }; | |
85 | /* common cpu data for all cpus */ | |
c3d8c141 | 86 | struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 }; |
129f6946 | 87 | EXPORT_SYMBOL(boot_cpu_data); |
1da177e4 LT |
88 | |
89 | unsigned long mmu_cr4_features; | |
90 | ||
8466361a | 91 | #ifdef CONFIG_ACPI |
1da177e4 LT |
92 | int acpi_disabled = 0; |
93 | #else | |
94 | int acpi_disabled = 1; | |
95 | #endif | |
96 | EXPORT_SYMBOL(acpi_disabled); | |
97 | ||
888ba6c6 | 98 | #ifdef CONFIG_ACPI |
1da177e4 LT |
99 | int __initdata acpi_force = 0; |
100 | extern acpi_interrupt_flags acpi_sci_flags; | |
101 | #endif | |
102 | ||
103 | /* for MCA, but anyone else can use it if they want */ | |
104 | unsigned int machine_id; | |
129f6946 AD |
105 | #ifdef CONFIG_MCA |
106 | EXPORT_SYMBOL(machine_id); | |
107 | #endif | |
1da177e4 LT |
108 | unsigned int machine_submodel_id; |
109 | unsigned int BIOS_revision; | |
110 | unsigned int mca_pentium_flag; | |
111 | ||
112 | /* For PCI or other memory-mapped resources */ | |
113 | unsigned long pci_mem_start = 0x10000000; | |
129f6946 AD |
114 | #ifdef CONFIG_PCI |
115 | EXPORT_SYMBOL(pci_mem_start); | |
116 | #endif | |
1da177e4 LT |
117 | |
118 | /* Boot loader ID as an integer, for the benefit of proc_dointvec */ | |
119 | int bootloader_type; | |
120 | ||
121 | /* user-defined highmem size */ | |
122 | static unsigned int highmem_pages = -1; | |
123 | ||
124 | /* | |
125 | * Setup options | |
126 | */ | |
127 | struct drive_info_struct { char dummy[32]; } drive_info; | |
129f6946 AD |
128 | #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \ |
129 | defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE) | |
130 | EXPORT_SYMBOL(drive_info); | |
131 | #endif | |
1da177e4 | 132 | struct screen_info screen_info; |
129f6946 | 133 | EXPORT_SYMBOL(screen_info); |
1da177e4 | 134 | struct apm_info apm_info; |
129f6946 | 135 | EXPORT_SYMBOL(apm_info); |
1da177e4 LT |
136 | struct sys_desc_table_struct { |
137 | unsigned short length; | |
138 | unsigned char table[0]; | |
139 | }; | |
140 | struct edid_info edid_info; | |
5e518d76 | 141 | EXPORT_SYMBOL_GPL(edid_info); |
1da177e4 | 142 | struct ist_info ist_info; |
129f6946 AD |
143 | #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ |
144 | defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) | |
145 | EXPORT_SYMBOL(ist_info); | |
146 | #endif | |
1da177e4 LT |
147 | struct e820map e820; |
148 | ||
149 | extern void early_cpu_init(void); | |
1da177e4 LT |
150 | extern void generic_apic_probe(char *); |
151 | extern int root_mountflags; | |
152 | ||
153 | unsigned long saved_videomode; | |
154 | ||
155 | #define RAMDISK_IMAGE_START_MASK 0x07FF | |
156 | #define RAMDISK_PROMPT_FLAG 0x8000 | |
157 | #define RAMDISK_LOAD_FLAG 0x4000 | |
158 | ||
159 | static char command_line[COMMAND_LINE_SIZE]; | |
160 | ||
161 | unsigned char __initdata boot_params[PARAM_SIZE]; | |
162 | ||
163 | static struct resource data_resource = { | |
164 | .name = "Kernel data", | |
165 | .start = 0, | |
166 | .end = 0, | |
167 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
168 | }; | |
169 | ||
170 | static struct resource code_resource = { | |
171 | .name = "Kernel code", | |
172 | .start = 0, | |
173 | .end = 0, | |
174 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
175 | }; | |
176 | ||
177 | static struct resource system_rom_resource = { | |
178 | .name = "System ROM", | |
179 | .start = 0xf0000, | |
180 | .end = 0xfffff, | |
181 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
182 | }; | |
183 | ||
184 | static struct resource extension_rom_resource = { | |
185 | .name = "Extension ROM", | |
186 | .start = 0xe0000, | |
187 | .end = 0xeffff, | |
188 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
189 | }; | |
190 | ||
191 | static struct resource adapter_rom_resources[] = { { | |
192 | .name = "Adapter ROM", | |
193 | .start = 0xc8000, | |
194 | .end = 0, | |
195 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
196 | }, { | |
197 | .name = "Adapter ROM", | |
198 | .start = 0, | |
199 | .end = 0, | |
200 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
201 | }, { | |
202 | .name = "Adapter ROM", | |
203 | .start = 0, | |
204 | .end = 0, | |
205 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
206 | }, { | |
207 | .name = "Adapter ROM", | |
208 | .start = 0, | |
209 | .end = 0, | |
210 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
211 | }, { | |
212 | .name = "Adapter ROM", | |
213 | .start = 0, | |
214 | .end = 0, | |
215 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
216 | }, { | |
217 | .name = "Adapter ROM", | |
218 | .start = 0, | |
219 | .end = 0, | |
220 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
221 | } }; | |
222 | ||
223 | #define ADAPTER_ROM_RESOURCES \ | |
224 | (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0]) | |
225 | ||
226 | static struct resource video_rom_resource = { | |
227 | .name = "Video ROM", | |
228 | .start = 0xc0000, | |
229 | .end = 0xc7fff, | |
230 | .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM | |
231 | }; | |
232 | ||
233 | static struct resource video_ram_resource = { | |
234 | .name = "Video RAM area", | |
235 | .start = 0xa0000, | |
236 | .end = 0xbffff, | |
237 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
238 | }; | |
239 | ||
240 | static struct resource standard_io_resources[] = { { | |
241 | .name = "dma1", | |
242 | .start = 0x0000, | |
243 | .end = 0x001f, | |
244 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
245 | }, { | |
246 | .name = "pic1", | |
247 | .start = 0x0020, | |
248 | .end = 0x0021, | |
249 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
250 | }, { | |
251 | .name = "timer0", | |
252 | .start = 0x0040, | |
253 | .end = 0x0043, | |
254 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
255 | }, { | |
256 | .name = "timer1", | |
257 | .start = 0x0050, | |
258 | .end = 0x0053, | |
259 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
260 | }, { | |
261 | .name = "keyboard", | |
262 | .start = 0x0060, | |
263 | .end = 0x006f, | |
264 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
265 | }, { | |
266 | .name = "dma page reg", | |
267 | .start = 0x0080, | |
268 | .end = 0x008f, | |
269 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
270 | }, { | |
271 | .name = "pic2", | |
272 | .start = 0x00a0, | |
273 | .end = 0x00a1, | |
274 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
275 | }, { | |
276 | .name = "dma2", | |
277 | .start = 0x00c0, | |
278 | .end = 0x00df, | |
279 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
280 | }, { | |
281 | .name = "fpu", | |
282 | .start = 0x00f0, | |
283 | .end = 0x00ff, | |
284 | .flags = IORESOURCE_BUSY | IORESOURCE_IO | |
285 | } }; | |
286 | ||
287 | #define STANDARD_IO_RESOURCES \ | |
288 | (sizeof standard_io_resources / sizeof standard_io_resources[0]) | |
289 | ||
290 | #define romsignature(x) (*(unsigned short *)(x) == 0xaa55) | |
291 | ||
292 | static int __init romchecksum(unsigned char *rom, unsigned long length) | |
293 | { | |
294 | unsigned char *p, sum = 0; | |
295 | ||
296 | for (p = rom; p < rom + length; p++) | |
297 | sum += *p; | |
298 | return sum == 0; | |
299 | } | |
300 | ||
301 | static void __init probe_roms(void) | |
302 | { | |
303 | unsigned long start, length, upper; | |
304 | unsigned char *rom; | |
305 | int i; | |
306 | ||
307 | /* video rom */ | |
308 | upper = adapter_rom_resources[0].start; | |
309 | for (start = video_rom_resource.start; start < upper; start += 2048) { | |
310 | rom = isa_bus_to_virt(start); | |
311 | if (!romsignature(rom)) | |
312 | continue; | |
313 | ||
314 | video_rom_resource.start = start; | |
315 | ||
316 | /* 0 < length <= 0x7f * 512, historically */ | |
317 | length = rom[2] * 512; | |
318 | ||
319 | /* if checksum okay, trust length byte */ | |
320 | if (length && romchecksum(rom, length)) | |
321 | video_rom_resource.end = start + length - 1; | |
322 | ||
323 | request_resource(&iomem_resource, &video_rom_resource); | |
324 | break; | |
325 | } | |
326 | ||
327 | start = (video_rom_resource.end + 1 + 2047) & ~2047UL; | |
328 | if (start < upper) | |
329 | start = upper; | |
330 | ||
331 | /* system rom */ | |
332 | request_resource(&iomem_resource, &system_rom_resource); | |
333 | upper = system_rom_resource.start; | |
334 | ||
335 | /* check for extension rom (ignore length byte!) */ | |
336 | rom = isa_bus_to_virt(extension_rom_resource.start); | |
337 | if (romsignature(rom)) { | |
338 | length = extension_rom_resource.end - extension_rom_resource.start + 1; | |
339 | if (romchecksum(rom, length)) { | |
340 | request_resource(&iomem_resource, &extension_rom_resource); | |
341 | upper = extension_rom_resource.start; | |
342 | } | |
343 | } | |
344 | ||
345 | /* check for adapter roms on 2k boundaries */ | |
346 | for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) { | |
347 | rom = isa_bus_to_virt(start); | |
348 | if (!romsignature(rom)) | |
349 | continue; | |
350 | ||
351 | /* 0 < length <= 0x7f * 512, historically */ | |
352 | length = rom[2] * 512; | |
353 | ||
354 | /* but accept any length that fits if checksum okay */ | |
355 | if (!length || start + length > upper || !romchecksum(rom, length)) | |
356 | continue; | |
357 | ||
358 | adapter_rom_resources[i].start = start; | |
359 | adapter_rom_resources[i].end = start + length - 1; | |
360 | request_resource(&iomem_resource, &adapter_rom_resources[i]); | |
361 | ||
362 | start = adapter_rom_resources[i++].end & ~2047UL; | |
363 | } | |
364 | } | |
365 | ||
366 | static void __init limit_regions(unsigned long long size) | |
367 | { | |
368 | unsigned long long current_addr = 0; | |
369 | int i; | |
370 | ||
371 | if (efi_enabled) { | |
7ae65fd3 MT |
372 | efi_memory_desc_t *md; |
373 | void *p; | |
374 | ||
375 | for (p = memmap.map, i = 0; p < memmap.map_end; | |
376 | p += memmap.desc_size, i++) { | |
377 | md = p; | |
378 | current_addr = md->phys_addr + (md->num_pages << 12); | |
379 | if (md->type == EFI_CONVENTIONAL_MEMORY) { | |
1da177e4 | 380 | if (current_addr >= size) { |
7ae65fd3 | 381 | md->num_pages -= |
1da177e4 LT |
382 | (((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT); |
383 | memmap.nr_map = i + 1; | |
384 | return; | |
385 | } | |
386 | } | |
387 | } | |
388 | } | |
389 | for (i = 0; i < e820.nr_map; i++) { | |
f014a556 DH |
390 | current_addr = e820.map[i].addr + e820.map[i].size; |
391 | if (current_addr < size) | |
392 | continue; | |
393 | ||
394 | if (e820.map[i].type != E820_RAM) | |
395 | continue; | |
396 | ||
397 | if (e820.map[i].addr >= size) { | |
398 | /* | |
399 | * This region starts past the end of the | |
400 | * requested size, skip it completely. | |
401 | */ | |
402 | e820.nr_map = i; | |
403 | } else { | |
404 | e820.nr_map = i + 1; | |
405 | e820.map[i].size -= current_addr - size; | |
1da177e4 | 406 | } |
f014a556 | 407 | return; |
1da177e4 LT |
408 | } |
409 | } | |
410 | ||
411 | static void __init add_memory_region(unsigned long long start, | |
412 | unsigned long long size, int type) | |
413 | { | |
414 | int x; | |
415 | ||
416 | if (!efi_enabled) { | |
417 | x = e820.nr_map; | |
418 | ||
419 | if (x == E820MAX) { | |
420 | printk(KERN_ERR "Ooops! Too many entries in the memory map!\n"); | |
421 | return; | |
422 | } | |
423 | ||
424 | e820.map[x].addr = start; | |
425 | e820.map[x].size = size; | |
426 | e820.map[x].type = type; | |
427 | e820.nr_map++; | |
428 | } | |
429 | } /* add_memory_region */ | |
430 | ||
431 | #define E820_DEBUG 1 | |
432 | ||
433 | static void __init print_memory_map(char *who) | |
434 | { | |
435 | int i; | |
436 | ||
437 | for (i = 0; i < e820.nr_map; i++) { | |
438 | printk(" %s: %016Lx - %016Lx ", who, | |
439 | e820.map[i].addr, | |
440 | e820.map[i].addr + e820.map[i].size); | |
441 | switch (e820.map[i].type) { | |
442 | case E820_RAM: printk("(usable)\n"); | |
443 | break; | |
444 | case E820_RESERVED: | |
445 | printk("(reserved)\n"); | |
446 | break; | |
447 | case E820_ACPI: | |
448 | printk("(ACPI data)\n"); | |
449 | break; | |
450 | case E820_NVS: | |
451 | printk("(ACPI NVS)\n"); | |
452 | break; | |
453 | default: printk("type %lu\n", e820.map[i].type); | |
454 | break; | |
455 | } | |
456 | } | |
457 | } | |
458 | ||
459 | /* | |
460 | * Sanitize the BIOS e820 map. | |
461 | * | |
462 | * Some e820 responses include overlapping entries. The following | |
463 | * replaces the original e820 map with a new one, removing overlaps. | |
464 | * | |
465 | */ | |
466 | struct change_member { | |
467 | struct e820entry *pbios; /* pointer to original bios entry */ | |
468 | unsigned long long addr; /* address for this change point */ | |
469 | }; | |
470 | static struct change_member change_point_list[2*E820MAX] __initdata; | |
471 | static struct change_member *change_point[2*E820MAX] __initdata; | |
472 | static struct e820entry *overlap_list[E820MAX] __initdata; | |
473 | static struct e820entry new_bios[E820MAX] __initdata; | |
474 | ||
475 | static int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map) | |
476 | { | |
477 | struct change_member *change_tmp; | |
478 | unsigned long current_type, last_type; | |
479 | unsigned long long last_addr; | |
480 | int chgidx, still_changing; | |
481 | int overlap_entries; | |
482 | int new_bios_entry; | |
483 | int old_nr, new_nr, chg_nr; | |
484 | int i; | |
485 | ||
486 | /* | |
487 | Visually we're performing the following (1,2,3,4 = memory types)... | |
488 | ||
489 | Sample memory map (w/overlaps): | |
490 | ____22__________________ | |
491 | ______________________4_ | |
492 | ____1111________________ | |
493 | _44_____________________ | |
494 | 11111111________________ | |
495 | ____________________33__ | |
496 | ___________44___________ | |
497 | __________33333_________ | |
498 | ______________22________ | |
499 | ___________________2222_ | |
500 | _________111111111______ | |
501 | _____________________11_ | |
502 | _________________4______ | |
503 | ||
504 | Sanitized equivalent (no overlap): | |
505 | 1_______________________ | |
506 | _44_____________________ | |
507 | ___1____________________ | |
508 | ____22__________________ | |
509 | ______11________________ | |
510 | _________1______________ | |
511 | __________3_____________ | |
512 | ___________44___________ | |
513 | _____________33_________ | |
514 | _______________2________ | |
515 | ________________1_______ | |
516 | _________________4______ | |
517 | ___________________2____ | |
518 | ____________________33__ | |
519 | ______________________4_ | |
520 | */ | |
521 | ||
522 | /* if there's only one memory region, don't bother */ | |
523 | if (*pnr_map < 2) | |
524 | return -1; | |
525 | ||
526 | old_nr = *pnr_map; | |
527 | ||
528 | /* bail out if we find any unreasonable addresses in bios map */ | |
529 | for (i=0; i<old_nr; i++) | |
530 | if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) | |
531 | return -1; | |
532 | ||
533 | /* create pointers for initial change-point information (for sorting) */ | |
534 | for (i=0; i < 2*old_nr; i++) | |
535 | change_point[i] = &change_point_list[i]; | |
536 | ||
537 | /* record all known change-points (starting and ending addresses), | |
538 | omitting those that are for empty memory regions */ | |
539 | chgidx = 0; | |
540 | for (i=0; i < old_nr; i++) { | |
541 | if (biosmap[i].size != 0) { | |
542 | change_point[chgidx]->addr = biosmap[i].addr; | |
543 | change_point[chgidx++]->pbios = &biosmap[i]; | |
544 | change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size; | |
545 | change_point[chgidx++]->pbios = &biosmap[i]; | |
546 | } | |
547 | } | |
548 | chg_nr = chgidx; /* true number of change-points */ | |
549 | ||
550 | /* sort change-point list by memory addresses (low -> high) */ | |
551 | still_changing = 1; | |
552 | while (still_changing) { | |
553 | still_changing = 0; | |
554 | for (i=1; i < chg_nr; i++) { | |
555 | /* if <current_addr> > <last_addr>, swap */ | |
556 | /* or, if current=<start_addr> & last=<end_addr>, swap */ | |
557 | if ((change_point[i]->addr < change_point[i-1]->addr) || | |
558 | ((change_point[i]->addr == change_point[i-1]->addr) && | |
559 | (change_point[i]->addr == change_point[i]->pbios->addr) && | |
560 | (change_point[i-1]->addr != change_point[i-1]->pbios->addr)) | |
561 | ) | |
562 | { | |
563 | change_tmp = change_point[i]; | |
564 | change_point[i] = change_point[i-1]; | |
565 | change_point[i-1] = change_tmp; | |
566 | still_changing=1; | |
567 | } | |
568 | } | |
569 | } | |
570 | ||
571 | /* create a new bios memory map, removing overlaps */ | |
572 | overlap_entries=0; /* number of entries in the overlap table */ | |
573 | new_bios_entry=0; /* index for creating new bios map entries */ | |
574 | last_type = 0; /* start with undefined memory type */ | |
575 | last_addr = 0; /* start with 0 as last starting address */ | |
576 | /* loop through change-points, determining affect on the new bios map */ | |
577 | for (chgidx=0; chgidx < chg_nr; chgidx++) | |
578 | { | |
579 | /* keep track of all overlapping bios entries */ | |
580 | if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr) | |
581 | { | |
582 | /* add map entry to overlap list (> 1 entry implies an overlap) */ | |
583 | overlap_list[overlap_entries++]=change_point[chgidx]->pbios; | |
584 | } | |
585 | else | |
586 | { | |
587 | /* remove entry from list (order independent, so swap with last) */ | |
588 | for (i=0; i<overlap_entries; i++) | |
589 | { | |
590 | if (overlap_list[i] == change_point[chgidx]->pbios) | |
591 | overlap_list[i] = overlap_list[overlap_entries-1]; | |
592 | } | |
593 | overlap_entries--; | |
594 | } | |
595 | /* if there are overlapping entries, decide which "type" to use */ | |
596 | /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */ | |
597 | current_type = 0; | |
598 | for (i=0; i<overlap_entries; i++) | |
599 | if (overlap_list[i]->type > current_type) | |
600 | current_type = overlap_list[i]->type; | |
601 | /* continue building up new bios map based on this information */ | |
602 | if (current_type != last_type) { | |
603 | if (last_type != 0) { | |
604 | new_bios[new_bios_entry].size = | |
605 | change_point[chgidx]->addr - last_addr; | |
606 | /* move forward only if the new size was non-zero */ | |
607 | if (new_bios[new_bios_entry].size != 0) | |
608 | if (++new_bios_entry >= E820MAX) | |
609 | break; /* no more space left for new bios entries */ | |
610 | } | |
611 | if (current_type != 0) { | |
612 | new_bios[new_bios_entry].addr = change_point[chgidx]->addr; | |
613 | new_bios[new_bios_entry].type = current_type; | |
614 | last_addr=change_point[chgidx]->addr; | |
615 | } | |
616 | last_type = current_type; | |
617 | } | |
618 | } | |
619 | new_nr = new_bios_entry; /* retain count for new bios entries */ | |
620 | ||
621 | /* copy new bios mapping into original location */ | |
622 | memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry)); | |
623 | *pnr_map = new_nr; | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Copy the BIOS e820 map into a safe place. | |
630 | * | |
631 | * Sanity-check it while we're at it.. | |
632 | * | |
633 | * If we're lucky and live on a modern system, the setup code | |
634 | * will have given us a memory map that we can use to properly | |
635 | * set up memory. If we aren't, we'll fake a memory map. | |
636 | * | |
637 | * We check to see that the memory map contains at least 2 elements | |
638 | * before we'll use it, because the detection code in setup.S may | |
639 | * not be perfect and most every PC known to man has two memory | |
640 | * regions: one from 0 to 640k, and one from 1mb up. (The IBM | |
641 | * thinkpad 560x, for example, does not cooperate with the memory | |
642 | * detection code.) | |
643 | */ | |
644 | static int __init copy_e820_map(struct e820entry * biosmap, int nr_map) | |
645 | { | |
646 | /* Only one memory region (or negative)? Ignore it */ | |
647 | if (nr_map < 2) | |
648 | return -1; | |
649 | ||
650 | do { | |
651 | unsigned long long start = biosmap->addr; | |
652 | unsigned long long size = biosmap->size; | |
653 | unsigned long long end = start + size; | |
654 | unsigned long type = biosmap->type; | |
655 | ||
656 | /* Overflow in 64 bits? Ignore the memory map. */ | |
657 | if (start > end) | |
658 | return -1; | |
659 | ||
660 | /* | |
661 | * Some BIOSes claim RAM in the 640k - 1M region. | |
662 | * Not right. Fix it up. | |
663 | */ | |
664 | if (type == E820_RAM) { | |
665 | if (start < 0x100000ULL && end > 0xA0000ULL) { | |
666 | if (start < 0xA0000ULL) | |
667 | add_memory_region(start, 0xA0000ULL-start, type); | |
668 | if (end <= 0x100000ULL) | |
669 | continue; | |
670 | start = 0x100000ULL; | |
671 | size = end - start; | |
672 | } | |
673 | } | |
674 | add_memory_region(start, size, type); | |
675 | } while (biosmap++,--nr_map); | |
676 | return 0; | |
677 | } | |
678 | ||
679 | #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) | |
680 | struct edd edd; | |
681 | #ifdef CONFIG_EDD_MODULE | |
682 | EXPORT_SYMBOL(edd); | |
683 | #endif | |
684 | /** | |
685 | * copy_edd() - Copy the BIOS EDD information | |
686 | * from boot_params into a safe place. | |
687 | * | |
688 | */ | |
689 | static inline void copy_edd(void) | |
690 | { | |
691 | memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature)); | |
692 | memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info)); | |
693 | edd.mbr_signature_nr = EDD_MBR_SIG_NR; | |
694 | edd.edd_info_nr = EDD_NR; | |
695 | } | |
696 | #else | |
697 | static inline void copy_edd(void) | |
698 | { | |
699 | } | |
700 | #endif | |
701 | ||
702 | /* | |
703 | * Do NOT EVER look at the BIOS memory size location. | |
704 | * It does not work on many machines. | |
705 | */ | |
706 | #define LOWMEMSIZE() (0x9f000) | |
707 | ||
708 | static void __init parse_cmdline_early (char ** cmdline_p) | |
709 | { | |
710 | char c = ' ', *to = command_line, *from = saved_command_line; | |
711 | int len = 0; | |
712 | int userdef = 0; | |
713 | ||
714 | /* Save unparsed command line copy for /proc/cmdline */ | |
715 | saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; | |
716 | ||
717 | for (;;) { | |
718 | if (c != ' ') | |
719 | goto next_char; | |
720 | /* | |
721 | * "mem=nopentium" disables the 4MB page tables. | |
722 | * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM | |
723 | * to <mem>, overriding the bios size. | |
724 | * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from | |
725 | * <start> to <start>+<mem>, overriding the bios size. | |
726 | * | |
727 | * HPA tells me bootloaders need to parse mem=, so no new | |
728 | * option should be mem= [also see Documentation/i386/boot.txt] | |
729 | */ | |
730 | if (!memcmp(from, "mem=", 4)) { | |
731 | if (to != command_line) | |
732 | to--; | |
733 | if (!memcmp(from+4, "nopentium", 9)) { | |
734 | from += 9+4; | |
735 | clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability); | |
736 | disable_pse = 1; | |
737 | } else { | |
738 | /* If the user specifies memory size, we | |
739 | * limit the BIOS-provided memory map to | |
740 | * that size. exactmap can be used to specify | |
741 | * the exact map. mem=number can be used to | |
742 | * trim the existing memory map. | |
743 | */ | |
744 | unsigned long long mem_size; | |
745 | ||
746 | mem_size = memparse(from+4, &from); | |
747 | limit_regions(mem_size); | |
748 | userdef=1; | |
749 | } | |
750 | } | |
751 | ||
752 | else if (!memcmp(from, "memmap=", 7)) { | |
753 | if (to != command_line) | |
754 | to--; | |
755 | if (!memcmp(from+7, "exactmap", 8)) { | |
92aa63a5 VG |
756 | #ifdef CONFIG_CRASH_DUMP |
757 | /* If we are doing a crash dump, we | |
758 | * still need to know the real mem | |
759 | * size before original memory map is | |
760 | * reset. | |
761 | */ | |
762 | find_max_pfn(); | |
763 | saved_max_pfn = max_pfn; | |
764 | #endif | |
1da177e4 LT |
765 | from += 8+7; |
766 | e820.nr_map = 0; | |
767 | userdef = 1; | |
768 | } else { | |
769 | /* If the user specifies memory size, we | |
770 | * limit the BIOS-provided memory map to | |
771 | * that size. exactmap can be used to specify | |
772 | * the exact map. mem=number can be used to | |
773 | * trim the existing memory map. | |
774 | */ | |
775 | unsigned long long start_at, mem_size; | |
776 | ||
777 | mem_size = memparse(from+7, &from); | |
778 | if (*from == '@') { | |
779 | start_at = memparse(from+1, &from); | |
780 | add_memory_region(start_at, mem_size, E820_RAM); | |
781 | } else if (*from == '#') { | |
782 | start_at = memparse(from+1, &from); | |
783 | add_memory_region(start_at, mem_size, E820_ACPI); | |
784 | } else if (*from == '$') { | |
785 | start_at = memparse(from+1, &from); | |
786 | add_memory_region(start_at, mem_size, E820_RESERVED); | |
787 | } else { | |
788 | limit_regions(mem_size); | |
789 | userdef=1; | |
790 | } | |
791 | } | |
792 | } | |
793 | ||
794 | else if (!memcmp(from, "noexec=", 7)) | |
795 | noexec_setup(from + 7); | |
796 | ||
797 | ||
798 | #ifdef CONFIG_X86_SMP | |
799 | /* | |
800 | * If the BIOS enumerates physical processors before logical, | |
801 | * maxcpus=N at enumeration-time can be used to disable HT. | |
802 | */ | |
803 | else if (!memcmp(from, "maxcpus=", 8)) { | |
804 | extern unsigned int maxcpus; | |
805 | ||
806 | maxcpus = simple_strtoul(from + 8, NULL, 0); | |
807 | } | |
808 | #endif | |
809 | ||
888ba6c6 | 810 | #ifdef CONFIG_ACPI |
1da177e4 LT |
811 | /* "acpi=off" disables both ACPI table parsing and interpreter */ |
812 | else if (!memcmp(from, "acpi=off", 8)) { | |
813 | disable_acpi(); | |
814 | } | |
815 | ||
816 | /* acpi=force to over-ride black-list */ | |
817 | else if (!memcmp(from, "acpi=force", 10)) { | |
818 | acpi_force = 1; | |
819 | acpi_ht = 1; | |
820 | acpi_disabled = 0; | |
821 | } | |
822 | ||
823 | /* acpi=strict disables out-of-spec workarounds */ | |
824 | else if (!memcmp(from, "acpi=strict", 11)) { | |
825 | acpi_strict = 1; | |
826 | } | |
827 | ||
828 | /* Limit ACPI just to boot-time to enable HT */ | |
829 | else if (!memcmp(from, "acpi=ht", 7)) { | |
830 | if (!acpi_force) | |
831 | disable_acpi(); | |
832 | acpi_ht = 1; | |
833 | } | |
834 | ||
835 | /* "pci=noacpi" disable ACPI IRQ routing and PCI scan */ | |
836 | else if (!memcmp(from, "pci=noacpi", 10)) { | |
837 | acpi_disable_pci(); | |
838 | } | |
839 | /* "acpi=noirq" disables ACPI interrupt routing */ | |
840 | else if (!memcmp(from, "acpi=noirq", 10)) { | |
841 | acpi_noirq_set(); | |
842 | } | |
843 | ||
844 | else if (!memcmp(from, "acpi_sci=edge", 13)) | |
845 | acpi_sci_flags.trigger = 1; | |
846 | ||
847 | else if (!memcmp(from, "acpi_sci=level", 14)) | |
848 | acpi_sci_flags.trigger = 3; | |
849 | ||
850 | else if (!memcmp(from, "acpi_sci=high", 13)) | |
851 | acpi_sci_flags.polarity = 1; | |
852 | ||
853 | else if (!memcmp(from, "acpi_sci=low", 12)) | |
854 | acpi_sci_flags.polarity = 3; | |
855 | ||
856 | #ifdef CONFIG_X86_IO_APIC | |
857 | else if (!memcmp(from, "acpi_skip_timer_override", 24)) | |
858 | acpi_skip_timer_override = 1; | |
1da177e4 | 859 | |
66759a01 CE |
860 | if (!memcmp(from, "disable_timer_pin_1", 19)) |
861 | disable_timer_pin_1 = 1; | |
862 | if (!memcmp(from, "enable_timer_pin_1", 18)) | |
863 | disable_timer_pin_1 = -1; | |
864 | ||
1da177e4 LT |
865 | /* disable IO-APIC */ |
866 | else if (!memcmp(from, "noapic", 6)) | |
867 | disable_ioapic_setup(); | |
0a305d2e | 868 | #endif /* CONFIG_X86_IO_APIC */ |
888ba6c6 | 869 | #endif /* CONFIG_ACPI */ |
1da177e4 | 870 | |
9635b47d EB |
871 | #ifdef CONFIG_X86_LOCAL_APIC |
872 | /* enable local APIC */ | |
873 | else if (!memcmp(from, "lapic", 5)) | |
874 | lapic_enable(); | |
875 | ||
876 | /* disable local APIC */ | |
877 | else if (!memcmp(from, "nolapic", 6)) | |
878 | lapic_disable(); | |
879 | #endif /* CONFIG_X86_LOCAL_APIC */ | |
880 | ||
1bc3b91a EB |
881 | #ifdef CONFIG_KEXEC |
882 | /* crashkernel=size@addr specifies the location to reserve for | |
883 | * a crash kernel. By reserving this memory we guarantee | |
884 | * that linux never set's it up as a DMA target. | |
885 | * Useful for holding code to do something appropriate | |
886 | * after a kernel panic. | |
887 | */ | |
888 | else if (!memcmp(from, "crashkernel=", 12)) { | |
889 | unsigned long size, base; | |
890 | size = memparse(from+12, &from); | |
891 | if (*from == '@') { | |
892 | base = memparse(from+1, &from); | |
893 | /* FIXME: Do I want a sanity check | |
894 | * to validate the memory range? | |
895 | */ | |
896 | crashk_res.start = base; | |
897 | crashk_res.end = base + size - 1; | |
898 | } | |
899 | } | |
900 | #endif | |
aac04b32 | 901 | #ifdef CONFIG_PROC_VMCORE |
2030eae5 VG |
902 | /* elfcorehdr= specifies the location of elf core header |
903 | * stored by the crashed kernel. | |
904 | */ | |
905 | else if (!memcmp(from, "elfcorehdr=", 11)) | |
906 | elfcorehdr_addr = memparse(from+11, &from); | |
907 | #endif | |
1bc3b91a | 908 | |
1da177e4 LT |
909 | /* |
910 | * highmem=size forces highmem to be exactly 'size' bytes. | |
911 | * This works even on boxes that have no highmem otherwise. | |
912 | * This also works to reduce highmem size on bigger boxes. | |
913 | */ | |
914 | else if (!memcmp(from, "highmem=", 8)) | |
915 | highmem_pages = memparse(from+8, &from) >> PAGE_SHIFT; | |
916 | ||
917 | /* | |
918 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
919 | * bytes. This can be used to increase (or decrease) the | |
920 | * vmalloc area - the default is 128m. | |
921 | */ | |
922 | else if (!memcmp(from, "vmalloc=", 8)) | |
923 | __VMALLOC_RESERVE = memparse(from+8, &from); | |
924 | ||
925 | next_char: | |
926 | c = *(from++); | |
927 | if (!c) | |
928 | break; | |
929 | if (COMMAND_LINE_SIZE <= ++len) | |
930 | break; | |
931 | *(to++) = c; | |
932 | } | |
933 | *to = '\0'; | |
934 | *cmdline_p = command_line; | |
935 | if (userdef) { | |
936 | printk(KERN_INFO "user-defined physical RAM map:\n"); | |
937 | print_memory_map("user"); | |
938 | } | |
939 | } | |
940 | ||
941 | /* | |
942 | * Callback for efi_memory_walk. | |
943 | */ | |
944 | static int __init | |
945 | efi_find_max_pfn(unsigned long start, unsigned long end, void *arg) | |
946 | { | |
947 | unsigned long *max_pfn = arg, pfn; | |
948 | ||
949 | if (start < end) { | |
950 | pfn = PFN_UP(end -1); | |
951 | if (pfn > *max_pfn) | |
952 | *max_pfn = pfn; | |
953 | } | |
954 | return 0; | |
955 | } | |
956 | ||
215c3409 AW |
957 | static int __init |
958 | efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg) | |
959 | { | |
960 | memory_present(0, start, end); | |
961 | return 0; | |
962 | } | |
1da177e4 LT |
963 | |
964 | /* | |
965 | * Find the highest page frame number we have available | |
966 | */ | |
967 | void __init find_max_pfn(void) | |
968 | { | |
969 | int i; | |
970 | ||
971 | max_pfn = 0; | |
972 | if (efi_enabled) { | |
973 | efi_memmap_walk(efi_find_max_pfn, &max_pfn); | |
215c3409 | 974 | efi_memmap_walk(efi_memory_present_wrapper, NULL); |
1da177e4 LT |
975 | return; |
976 | } | |
977 | ||
978 | for (i = 0; i < e820.nr_map; i++) { | |
979 | unsigned long start, end; | |
980 | /* RAM? */ | |
981 | if (e820.map[i].type != E820_RAM) | |
982 | continue; | |
983 | start = PFN_UP(e820.map[i].addr); | |
984 | end = PFN_DOWN(e820.map[i].addr + e820.map[i].size); | |
985 | if (start >= end) | |
986 | continue; | |
987 | if (end > max_pfn) | |
988 | max_pfn = end; | |
215c3409 | 989 | memory_present(0, start, end); |
1da177e4 LT |
990 | } |
991 | } | |
992 | ||
993 | /* | |
994 | * Determine low and high memory ranges: | |
995 | */ | |
996 | unsigned long __init find_max_low_pfn(void) | |
997 | { | |
998 | unsigned long max_low_pfn; | |
999 | ||
1000 | max_low_pfn = max_pfn; | |
1001 | if (max_low_pfn > MAXMEM_PFN) { | |
1002 | if (highmem_pages == -1) | |
1003 | highmem_pages = max_pfn - MAXMEM_PFN; | |
1004 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
1005 | max_pfn = MAXMEM_PFN + highmem_pages; | |
1006 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
1007 | printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages)); | |
1008 | highmem_pages = 0; | |
1009 | } | |
1010 | max_low_pfn = MAXMEM_PFN; | |
1011 | #ifndef CONFIG_HIGHMEM | |
1012 | /* Maximum memory usable is what is directly addressable */ | |
1013 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", | |
1014 | MAXMEM>>20); | |
1015 | if (max_pfn > MAX_NONPAE_PFN) | |
1016 | printk(KERN_WARNING "Use a PAE enabled kernel.\n"); | |
1017 | else | |
1018 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
1019 | max_pfn = MAXMEM_PFN; | |
1020 | #else /* !CONFIG_HIGHMEM */ | |
1021 | #ifndef CONFIG_X86_PAE | |
1022 | if (max_pfn > MAX_NONPAE_PFN) { | |
1023 | max_pfn = MAX_NONPAE_PFN; | |
1024 | printk(KERN_WARNING "Warning only 4GB will be used.\n"); | |
1025 | printk(KERN_WARNING "Use a PAE enabled kernel.\n"); | |
1026 | } | |
1027 | #endif /* !CONFIG_X86_PAE */ | |
1028 | #endif /* !CONFIG_HIGHMEM */ | |
1029 | } else { | |
1030 | if (highmem_pages == -1) | |
1031 | highmem_pages = 0; | |
1032 | #ifdef CONFIG_HIGHMEM | |
1033 | if (highmem_pages >= max_pfn) { | |
1034 | printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
1035 | highmem_pages = 0; | |
1036 | } | |
1037 | if (highmem_pages) { | |
1038 | if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){ | |
1039 | printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages)); | |
1040 | highmem_pages = 0; | |
1041 | } | |
1042 | max_low_pfn -= highmem_pages; | |
1043 | } | |
1044 | #else | |
1045 | if (highmem_pages) | |
1046 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
1047 | #endif | |
1048 | } | |
1049 | return max_low_pfn; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Free all available memory for boot time allocation. Used | |
1054 | * as a callback function by efi_memory_walk() | |
1055 | */ | |
1056 | ||
1057 | static int __init | |
1058 | free_available_memory(unsigned long start, unsigned long end, void *arg) | |
1059 | { | |
1060 | /* check max_low_pfn */ | |
1061 | if (start >= ((max_low_pfn + 1) << PAGE_SHIFT)) | |
1062 | return 0; | |
1063 | if (end >= ((max_low_pfn + 1) << PAGE_SHIFT)) | |
1064 | end = (max_low_pfn + 1) << PAGE_SHIFT; | |
1065 | if (start < end) | |
1066 | free_bootmem(start, end - start); | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | /* | |
1071 | * Register fully available low RAM pages with the bootmem allocator. | |
1072 | */ | |
1073 | static void __init register_bootmem_low_pages(unsigned long max_low_pfn) | |
1074 | { | |
1075 | int i; | |
1076 | ||
1077 | if (efi_enabled) { | |
1078 | efi_memmap_walk(free_available_memory, NULL); | |
1079 | return; | |
1080 | } | |
1081 | for (i = 0; i < e820.nr_map; i++) { | |
1082 | unsigned long curr_pfn, last_pfn, size; | |
1083 | /* | |
1084 | * Reserve usable low memory | |
1085 | */ | |
1086 | if (e820.map[i].type != E820_RAM) | |
1087 | continue; | |
1088 | /* | |
1089 | * We are rounding up the start address of usable memory: | |
1090 | */ | |
1091 | curr_pfn = PFN_UP(e820.map[i].addr); | |
1092 | if (curr_pfn >= max_low_pfn) | |
1093 | continue; | |
1094 | /* | |
1095 | * ... and at the end of the usable range downwards: | |
1096 | */ | |
1097 | last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size); | |
1098 | ||
1099 | if (last_pfn > max_low_pfn) | |
1100 | last_pfn = max_low_pfn; | |
1101 | ||
1102 | /* | |
1103 | * .. finally, did all the rounding and playing | |
1104 | * around just make the area go away? | |
1105 | */ | |
1106 | if (last_pfn <= curr_pfn) | |
1107 | continue; | |
1108 | ||
1109 | size = last_pfn - curr_pfn; | |
1110 | free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * workaround for Dell systems that neglect to reserve EBDA | |
1116 | */ | |
1117 | static void __init reserve_ebda_region(void) | |
1118 | { | |
1119 | unsigned int addr; | |
1120 | addr = get_bios_ebda(); | |
1121 | if (addr) | |
1122 | reserve_bootmem(addr, PAGE_SIZE); | |
1123 | } | |
1124 | ||
05b79bdc | 1125 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
1126 | void __init setup_bootmem_allocator(void); |
1127 | static unsigned long __init setup_memory(void) | |
1128 | { | |
1129 | /* | |
1130 | * partially used pages are not usable - thus | |
1131 | * we are rounding upwards: | |
1132 | */ | |
1133 | min_low_pfn = PFN_UP(init_pg_tables_end); | |
1134 | ||
1135 | find_max_pfn(); | |
1136 | ||
1137 | max_low_pfn = find_max_low_pfn(); | |
1138 | ||
1139 | #ifdef CONFIG_HIGHMEM | |
1140 | highstart_pfn = highend_pfn = max_pfn; | |
1141 | if (max_pfn > max_low_pfn) { | |
1142 | highstart_pfn = max_low_pfn; | |
1143 | } | |
1144 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", | |
1145 | pages_to_mb(highend_pfn - highstart_pfn)); | |
1146 | #endif | |
1147 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", | |
1148 | pages_to_mb(max_low_pfn)); | |
1149 | ||
1150 | setup_bootmem_allocator(); | |
1151 | ||
1152 | return max_low_pfn; | |
1153 | } | |
1154 | ||
1155 | void __init zone_sizes_init(void) | |
1156 | { | |
1157 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; | |
1158 | unsigned int max_dma, low; | |
1159 | ||
1160 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
1161 | low = max_low_pfn; | |
1162 | ||
1163 | if (low < max_dma) | |
1164 | zones_size[ZONE_DMA] = low; | |
1165 | else { | |
1166 | zones_size[ZONE_DMA] = max_dma; | |
1167 | zones_size[ZONE_NORMAL] = low - max_dma; | |
1168 | #ifdef CONFIG_HIGHMEM | |
1169 | zones_size[ZONE_HIGHMEM] = highend_pfn - low; | |
1170 | #endif | |
1171 | } | |
1172 | free_area_init(zones_size); | |
1173 | } | |
1174 | #else | |
05b79bdc | 1175 | extern unsigned long __init setup_memory(void); |
1da177e4 | 1176 | extern void zone_sizes_init(void); |
05b79bdc | 1177 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 LT |
1178 | |
1179 | void __init setup_bootmem_allocator(void) | |
1180 | { | |
1181 | unsigned long bootmap_size; | |
1182 | /* | |
1183 | * Initialize the boot-time allocator (with low memory only): | |
1184 | */ | |
1185 | bootmap_size = init_bootmem(min_low_pfn, max_low_pfn); | |
1186 | ||
1187 | register_bootmem_low_pages(max_low_pfn); | |
1188 | ||
1189 | /* | |
1190 | * Reserve the bootmem bitmap itself as well. We do this in two | |
1191 | * steps (first step was init_bootmem()) because this catches | |
1192 | * the (very unlikely) case of us accidentally initializing the | |
1193 | * bootmem allocator with an invalid RAM area. | |
1194 | */ | |
8a919085 VG |
1195 | reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) + |
1196 | bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START)); | |
1da177e4 LT |
1197 | |
1198 | /* | |
1199 | * reserve physical page 0 - it's a special BIOS page on many boxes, | |
1200 | * enabling clean reboots, SMP operation, laptop functions. | |
1201 | */ | |
1202 | reserve_bootmem(0, PAGE_SIZE); | |
1203 | ||
1204 | /* reserve EBDA region, it's a 4K region */ | |
1205 | reserve_ebda_region(); | |
1206 | ||
1207 | /* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent | |
1208 | PCI prefetch into it (errata #56). Usually the page is reserved anyways, | |
1209 | unless you have no PS/2 mouse plugged in. */ | |
1210 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
1211 | boot_cpu_data.x86 == 6) | |
1212 | reserve_bootmem(0xa0000 - 4096, 4096); | |
1213 | ||
1214 | #ifdef CONFIG_SMP | |
1215 | /* | |
1216 | * But first pinch a few for the stack/trampoline stuff | |
1217 | * FIXME: Don't need the extra page at 4K, but need to fix | |
1218 | * trampoline before removing it. (see the GDT stuff) | |
1219 | */ | |
1220 | reserve_bootmem(PAGE_SIZE, PAGE_SIZE); | |
1221 | #endif | |
1222 | #ifdef CONFIG_ACPI_SLEEP | |
1223 | /* | |
1224 | * Reserve low memory region for sleep support. | |
1225 | */ | |
1226 | acpi_reserve_bootmem(); | |
1227 | #endif | |
1228 | #ifdef CONFIG_X86_FIND_SMP_CONFIG | |
1229 | /* | |
1230 | * Find and reserve possible boot-time SMP configuration: | |
1231 | */ | |
1232 | find_smp_config(); | |
1233 | #endif | |
1234 | ||
1235 | #ifdef CONFIG_BLK_DEV_INITRD | |
1236 | if (LOADER_TYPE && INITRD_START) { | |
1237 | if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { | |
1238 | reserve_bootmem(INITRD_START, INITRD_SIZE); | |
1239 | initrd_start = | |
1240 | INITRD_START ? INITRD_START + PAGE_OFFSET : 0; | |
1241 | initrd_end = initrd_start+INITRD_SIZE; | |
1242 | } | |
1243 | else { | |
1244 | printk(KERN_ERR "initrd extends beyond end of memory " | |
1245 | "(0x%08lx > 0x%08lx)\ndisabling initrd\n", | |
1246 | INITRD_START + INITRD_SIZE, | |
1247 | max_low_pfn << PAGE_SHIFT); | |
1248 | initrd_start = 0; | |
1249 | } | |
1250 | } | |
1251 | #endif | |
1bc3b91a EB |
1252 | #ifdef CONFIG_KEXEC |
1253 | if (crashk_res.start != crashk_res.end) | |
1254 | reserve_bootmem(crashk_res.start, | |
1255 | crashk_res.end - crashk_res.start + 1); | |
1256 | #endif | |
1da177e4 LT |
1257 | } |
1258 | ||
1259 | /* | |
1260 | * The node 0 pgdat is initialized before all of these because | |
1261 | * it's needed for bootmem. node>0 pgdats have their virtual | |
1262 | * space allocated before the pagetables are in place to access | |
1263 | * them, so they can't be cleared then. | |
1264 | * | |
1265 | * This should all compile down to nothing when NUMA is off. | |
1266 | */ | |
1267 | void __init remapped_pgdat_init(void) | |
1268 | { | |
1269 | int nid; | |
1270 | ||
1271 | for_each_online_node(nid) { | |
1272 | if (nid != 0) | |
1273 | memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | /* | |
1278 | * Request address space for all standard RAM and ROM resources | |
1279 | * and also for regions reported as reserved by the e820. | |
1280 | */ | |
1281 | static void __init | |
1282 | legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource) | |
1283 | { | |
1284 | int i; | |
1285 | ||
1286 | probe_roms(); | |
1287 | for (i = 0; i < e820.nr_map; i++) { | |
1288 | struct resource *res; | |
1289 | if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL) | |
1290 | continue; | |
1291 | res = alloc_bootmem_low(sizeof(struct resource)); | |
1292 | switch (e820.map[i].type) { | |
1293 | case E820_RAM: res->name = "System RAM"; break; | |
1294 | case E820_ACPI: res->name = "ACPI Tables"; break; | |
1295 | case E820_NVS: res->name = "ACPI Non-volatile Storage"; break; | |
1296 | default: res->name = "reserved"; | |
1297 | } | |
1298 | res->start = e820.map[i].addr; | |
1299 | res->end = res->start + e820.map[i].size - 1; | |
1300 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
1301 | request_resource(&iomem_resource, res); | |
1302 | if (e820.map[i].type == E820_RAM) { | |
1303 | /* | |
1304 | * We don't know which RAM region contains kernel data, | |
1305 | * so we try it repeatedly and let the resource manager | |
1306 | * test it. | |
1307 | */ | |
1308 | request_resource(res, code_resource); | |
1309 | request_resource(res, data_resource); | |
1bc3b91a EB |
1310 | #ifdef CONFIG_KEXEC |
1311 | request_resource(res, &crashk_res); | |
1312 | #endif | |
1da177e4 LT |
1313 | } |
1314 | } | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Request address space for all standard resources | |
1319 | */ | |
1320 | static void __init register_memory(void) | |
1321 | { | |
f0eca962 | 1322 | unsigned long gapstart, gapsize, round; |
1da177e4 LT |
1323 | unsigned long long last; |
1324 | int i; | |
1325 | ||
1326 | if (efi_enabled) | |
1327 | efi_initialize_iomem_resources(&code_resource, &data_resource); | |
1328 | else | |
1329 | legacy_init_iomem_resources(&code_resource, &data_resource); | |
1330 | ||
1331 | /* EFI systems may still have VGA */ | |
1332 | request_resource(&iomem_resource, &video_ram_resource); | |
1333 | ||
1334 | /* request I/O space for devices used on all i[345]86 PCs */ | |
1335 | for (i = 0; i < STANDARD_IO_RESOURCES; i++) | |
1336 | request_resource(&ioport_resource, &standard_io_resources[i]); | |
1337 | ||
1338 | /* | |
1339 | * Search for the bigest gap in the low 32 bits of the e820 | |
1340 | * memory space. | |
1341 | */ | |
1342 | last = 0x100000000ull; | |
1343 | gapstart = 0x10000000; | |
1344 | gapsize = 0x400000; | |
1345 | i = e820.nr_map; | |
1346 | while (--i >= 0) { | |
1347 | unsigned long long start = e820.map[i].addr; | |
1348 | unsigned long long end = start + e820.map[i].size; | |
1349 | ||
1350 | /* | |
1351 | * Since "last" is at most 4GB, we know we'll | |
1352 | * fit in 32 bits if this condition is true | |
1353 | */ | |
1354 | if (last > end) { | |
1355 | unsigned long gap = last - end; | |
1356 | ||
1357 | if (gap > gapsize) { | |
1358 | gapsize = gap; | |
1359 | gapstart = end; | |
1360 | } | |
1361 | } | |
1362 | if (start < last) | |
1363 | last = start; | |
1364 | } | |
1365 | ||
1366 | /* | |
f0eca962 DR |
1367 | * See how much we want to round up: start off with |
1368 | * rounding to the next 1MB area. | |
1da177e4 | 1369 | */ |
f0eca962 DR |
1370 | round = 0x100000; |
1371 | while ((gapsize >> 4) > round) | |
1372 | round += round; | |
1373 | /* Fun with two's complement */ | |
1374 | pci_mem_start = (gapstart + round) & -round; | |
1da177e4 LT |
1375 | |
1376 | printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n", | |
1377 | pci_mem_start, gapstart, gapsize); | |
1378 | } | |
1379 | ||
1da177e4 LT |
1380 | static char * __init machine_specific_memory_setup(void); |
1381 | ||
1382 | #ifdef CONFIG_MCA | |
1383 | static void set_mca_bus(int x) | |
1384 | { | |
1385 | MCA_bus = x; | |
1386 | } | |
1387 | #else | |
1388 | static void set_mca_bus(int x) { } | |
1389 | #endif | |
1390 | ||
1391 | /* | |
1392 | * Determine if we were loaded by an EFI loader. If so, then we have also been | |
1393 | * passed the efi memmap, systab, etc., so we should use these data structures | |
1394 | * for initialization. Note, the efi init code path is determined by the | |
1395 | * global efi_enabled. This allows the same kernel image to be used on existing | |
1396 | * systems (with a traditional BIOS) as well as on EFI systems. | |
1397 | */ | |
1398 | void __init setup_arch(char **cmdline_p) | |
1399 | { | |
1400 | unsigned long max_low_pfn; | |
1401 | ||
1402 | memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); | |
1403 | pre_setup_arch_hook(); | |
1404 | early_cpu_init(); | |
1405 | ||
1406 | /* | |
1407 | * FIXME: This isn't an official loader_type right | |
1408 | * now but does currently work with elilo. | |
1409 | * If we were configured as an EFI kernel, check to make | |
1410 | * sure that we were loaded correctly from elilo and that | |
1411 | * the system table is valid. If not, then initialize normally. | |
1412 | */ | |
1413 | #ifdef CONFIG_EFI | |
1414 | if ((LOADER_TYPE == 0x50) && EFI_SYSTAB) | |
1415 | efi_enabled = 1; | |
1416 | #endif | |
1417 | ||
1418 | ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); | |
1419 | drive_info = DRIVE_INFO; | |
1420 | screen_info = SCREEN_INFO; | |
1421 | edid_info = EDID_INFO; | |
1422 | apm_info.bios = APM_BIOS_INFO; | |
1423 | ist_info = IST_INFO; | |
1424 | saved_videomode = VIDEO_MODE; | |
1425 | if( SYS_DESC_TABLE.length != 0 ) { | |
1426 | set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2); | |
1427 | machine_id = SYS_DESC_TABLE.table[0]; | |
1428 | machine_submodel_id = SYS_DESC_TABLE.table[1]; | |
1429 | BIOS_revision = SYS_DESC_TABLE.table[2]; | |
1430 | } | |
1431 | bootloader_type = LOADER_TYPE; | |
1432 | ||
1433 | #ifdef CONFIG_BLK_DEV_RAM | |
1434 | rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; | |
1435 | rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); | |
1436 | rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); | |
1437 | #endif | |
1438 | ARCH_SETUP | |
1439 | if (efi_enabled) | |
1440 | efi_init(); | |
1441 | else { | |
1442 | printk(KERN_INFO "BIOS-provided physical RAM map:\n"); | |
1443 | print_memory_map(machine_specific_memory_setup()); | |
1444 | } | |
1445 | ||
1446 | copy_edd(); | |
1447 | ||
1448 | if (!MOUNT_ROOT_RDONLY) | |
1449 | root_mountflags &= ~MS_RDONLY; | |
1450 | init_mm.start_code = (unsigned long) _text; | |
1451 | init_mm.end_code = (unsigned long) _etext; | |
1452 | init_mm.end_data = (unsigned long) _edata; | |
1453 | init_mm.brk = init_pg_tables_end + PAGE_OFFSET; | |
1454 | ||
1455 | code_resource.start = virt_to_phys(_text); | |
1456 | code_resource.end = virt_to_phys(_etext)-1; | |
1457 | data_resource.start = virt_to_phys(_etext); | |
1458 | data_resource.end = virt_to_phys(_edata)-1; | |
1459 | ||
1460 | parse_cmdline_early(cmdline_p); | |
1461 | ||
1462 | max_low_pfn = setup_memory(); | |
1463 | ||
1464 | /* | |
1465 | * NOTE: before this point _nobody_ is allowed to allocate | |
1466 | * any memory using the bootmem allocator. Although the | |
1467 | * alloctor is now initialised only the first 8Mb of the kernel | |
1468 | * virtual address space has been mapped. All allocations before | |
1469 | * paging_init() has completed must use the alloc_bootmem_low_pages() | |
1470 | * variant (which allocates DMA'able memory) and care must be taken | |
1471 | * not to exceed the 8Mb limit. | |
1472 | */ | |
1473 | ||
1474 | #ifdef CONFIG_SMP | |
1475 | smp_alloc_memory(); /* AP processor realmode stacks in low memory*/ | |
1476 | #endif | |
1477 | paging_init(); | |
1478 | remapped_pgdat_init(); | |
05b79bdc | 1479 | sparse_init(); |
1da177e4 LT |
1480 | zone_sizes_init(); |
1481 | ||
1482 | /* | |
1483 | * NOTE: at this point the bootmem allocator is fully available. | |
1484 | */ | |
1485 | ||
1486 | #ifdef CONFIG_EARLY_PRINTK | |
1487 | { | |
1488 | char *s = strstr(*cmdline_p, "earlyprintk="); | |
1489 | if (s) { | |
1490 | extern void setup_early_printk(char *); | |
1491 | ||
2a2d5924 | 1492 | setup_early_printk(strchr(s, '=') + 1); |
1da177e4 LT |
1493 | printk("early console enabled\n"); |
1494 | } | |
1495 | } | |
1496 | #endif | |
1497 | ||
1498 | ||
1499 | dmi_scan_machine(); | |
1500 | ||
1501 | #ifdef CONFIG_X86_GENERICARCH | |
1502 | generic_apic_probe(*cmdline_p); | |
1503 | #endif | |
1504 | if (efi_enabled) | |
1505 | efi_map_memmap(); | |
1506 | ||
f9262c12 AK |
1507 | #ifdef CONFIG_X86_IO_APIC |
1508 | check_acpi_pci(); /* Checks more than just ACPI actually */ | |
1509 | #endif | |
1510 | ||
888ba6c6 | 1511 | #ifdef CONFIG_ACPI |
1da177e4 LT |
1512 | /* |
1513 | * Parse the ACPI tables for possible boot-time SMP configuration. | |
1514 | */ | |
1515 | acpi_boot_table_init(); | |
1516 | acpi_boot_init(); | |
1517 | ||
911a62d4 VP |
1518 | #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC) |
1519 | if (def_to_bigsmp) | |
1520 | printk(KERN_WARNING "More than 8 CPUs detected and " | |
1521 | "CONFIG_X86_PC cannot handle it.\nUse " | |
1522 | "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n"); | |
1523 | #endif | |
1524 | #endif | |
1da177e4 LT |
1525 | #ifdef CONFIG_X86_LOCAL_APIC |
1526 | if (smp_found_config) | |
1527 | get_smp_config(); | |
1528 | #endif | |
1529 | ||
1530 | register_memory(); | |
1531 | ||
1532 | #ifdef CONFIG_VT | |
1533 | #if defined(CONFIG_VGA_CONSOLE) | |
1534 | if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) | |
1535 | conswitchp = &vga_con; | |
1536 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
1537 | conswitchp = &dummy_con; | |
1538 | #endif | |
1539 | #endif | |
1540 | } | |
1541 | ||
1542 | #include "setup_arch_post.h" | |
1543 | /* | |
1544 | * Local Variables: | |
1545 | * mode:c | |
1546 | * c-file-style:"k&r" | |
1547 | * c-basic-offset:8 | |
1548 | * End: | |
1549 | */ |