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[IRDA]: Replace hard-coded dev_self[] array sizes with ARRAY_SIZE()
[linux-2.6.git] / arch / i386 / kernel / setup.c
blobf1682206d304d31fb650992bf8a1cb551b2c54ee
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>
28 #include <linux/mmzone.h>
29 #include <linux/screen_info.h>
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>
36 #include <linux/platform_device.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>
46 #include <linux/kexec.h>
47 #include <linux/crash_dump.h>
48 #include <linux/dmi.h>
49 #include <linux/pfn.h>
50
51 #include <video/edid.h>
52
53 #include <asm/apic.h>
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>
62 #include <setup_arch.h>
63 #include <bios_ebda.h>
64
65 /* Forward Declaration. */
66 void __init find_max_pfn(void);
67
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
73 int disable_pse __devinitdata = 0;
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 */
87 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
88 EXPORT_SYMBOL(boot_cpu_data);
89
90 unsigned long mmu_cr4_features;
91
92 #ifdef CONFIG_ACPI
93 int acpi_disabled = 0;
94 #else
95 int acpi_disabled = 1;
96 #endif
97 EXPORT_SYMBOL(acpi_disabled);
98
99 #ifdef CONFIG_ACPI
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;
106 #ifdef CONFIG_MCA
107 EXPORT_SYMBOL(machine_id);
108 #endif
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;
115 #ifdef CONFIG_PCI
116 EXPORT_SYMBOL(pci_mem_start);
117 #endif
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;
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
133 struct screen_info screen_info;
134 EXPORT_SYMBOL(screen_info);
135 struct apm_info apm_info;
136 EXPORT_SYMBOL(apm_info);
137 struct sys_desc_table_struct {
138 unsigned short length;
139 unsigned char table[0];
140 };
141 struct edid_info edid_info;
142 EXPORT_SYMBOL_GPL(edid_info);
143 struct ist_info ist_info;
144 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
145 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
146 EXPORT_SYMBOL(ist_info);
147 #endif
148 struct e820map e820;
149
150 extern void early_cpu_init(void);
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) {
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) {
381 if (current_addr >= size) {
382 md->num_pages -=
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++) {
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;
407 }
408 return;
409 }
410 }
411
412 void __init add_memory_region(unsigned long long start,
413 unsigned long long size, int type)
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
476 int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
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 */
645 int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
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
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)) {
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
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
805 #ifdef CONFIG_ACPI
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;
854
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
860 /* disable IO-APIC */
861 else if (!memcmp(from, "noapic", 6))
862 disable_ioapic_setup();
863 #endif /* CONFIG_X86_IO_APIC */
864 #endif /* CONFIG_ACPI */
865
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
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
896 #ifdef CONFIG_PROC_VMCORE
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
903
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
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 }
958
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
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);
1001 efi_memmap_walk(efi_memory_present_wrapper, NULL);
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;
1016 memory_present(0, start, end);
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 */
1088 if (start >= (max_low_pfn << PAGE_SHIFT))
1089 return 0;
1090 if (end >= (max_low_pfn << PAGE_SHIFT))
1091 end = max_low_pfn << PAGE_SHIFT;
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
1152 #ifndef CONFIG_NEED_MULTIPLE_NODES
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
1202 extern unsigned long __init setup_memory(void);
1203 extern void zone_sizes_init(void);
1204 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
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 */
1222 reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) +
1223 bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START));
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
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
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;
1316 #ifndef CONFIG_RESOURCES_64BIT
1317 if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
1318 continue;
1319 #endif
1320 res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
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;
1330 if (request_resource(&iomem_resource, res)) {
1331 kfree(res);
1332 continue;
1333 }
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);
1342 #ifdef CONFIG_KEXEC
1343 request_resource(res, &crashk_res);
1344 #endif
1345 }
1346 }
1347 }
1348
1349 /*
1350 * Request address space for all standard resources
1351 *
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).
1354 */
1355 static int __init request_standard_resources(void)
1356 {
1357 int i;
1358
1359 printk("Setting up standard PCI resources\n");
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]);
1371 return 0;
1372 }
1373
1374 subsys_initcall(request_standard_resources);
1375
1376 static void __init register_memory(void)
1377 {
1378 unsigned long gapstart, gapsize, round;
1379 unsigned long long last;
1380 int i;
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 /*
1411 * See how much we want to round up: start off with
1412 * rounding to the next 1MB area.
1413 */
1414 round = 0x100000;
1415 while ((gapsize >> 4) > round)
1416 round += round;
1417 /* Fun with two's complement */
1418 pci_mem_start = (gapstart + round) & -round;
1419
1420 printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
1421 pci_mem_start, gapstart, gapsize);
1422 }
1423
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
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
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();
1531 sparse_init();
1532 zone_sizes_init();
1533
1534 /*
1535 * NOTE: at this point the bootmem allocator is fully available.
1536 */
1537
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
1546 #ifdef CONFIG_ACPI
1547 /*
1548 * Parse the ACPI tables for possible boot-time SMP configuration.
1549 */
1550 acpi_boot_table_init();
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
1558 acpi_boot_init();
1559
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
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
1582 tsc_init();
1583 }
1584
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
1602 /*
1603 * Local Variables:
1604 * mode:c
1605 * c-file-style:"k&r"
1606 * c-basic-offset:8
1607 * End:
1608 */
Linus' kernel tree