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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched
[deliverable/linux.git] / arch / x86 / kernel / e820_32.c
1 #include <linux/kernel.h>
2 #include <linux/types.h>
3 #include <linux/init.h>
4 #include <linux/bootmem.h>
5 #include <linux/ioport.h>
6 #include <linux/string.h>
7 #include <linux/kexec.h>
8 #include <linux/module.h>
9 #include <linux/mm.h>
10 #include <linux/efi.h>
11 #include <linux/pfn.h>
12 #include <linux/uaccess.h>
13 #include <linux/suspend.h>
14
15 #include <asm/pgtable.h>
16 #include <asm/page.h>
17 #include <asm/e820.h>
18 #include <asm/setup.h>
19
20 #ifdef CONFIG_EFI
21 int efi_enabled = 0;
22 EXPORT_SYMBOL(efi_enabled);
23 #endif
24
25 struct e820map e820;
26 struct change_member {
27 struct e820entry *pbios; /* pointer to original bios entry */
28 unsigned long long addr; /* address for this change point */
29 };
30 static struct change_member change_point_list[2*E820MAX] __initdata;
31 static struct change_member *change_point[2*E820MAX] __initdata;
32 static struct e820entry *overlap_list[E820MAX] __initdata;
33 static struct e820entry new_bios[E820MAX] __initdata;
34 /* For PCI or other memory-mapped resources */
35 unsigned long pci_mem_start = 0x10000000;
36 #ifdef CONFIG_PCI
37 EXPORT_SYMBOL(pci_mem_start);
38 #endif
39 extern int user_defined_memmap;
40 struct resource data_resource = {
41 .name = "Kernel data",
42 .start = 0,
43 .end = 0,
44 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
45 };
46
47 struct resource code_resource = {
48 .name = "Kernel code",
49 .start = 0,
50 .end = 0,
51 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
52 };
53
54 static struct resource system_rom_resource = {
55 .name = "System ROM",
56 .start = 0xf0000,
57 .end = 0xfffff,
58 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
59 };
60
61 static struct resource extension_rom_resource = {
62 .name = "Extension ROM",
63 .start = 0xe0000,
64 .end = 0xeffff,
65 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
66 };
67
68 static struct resource adapter_rom_resources[] = { {
69 .name = "Adapter ROM",
70 .start = 0xc8000,
71 .end = 0,
72 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
73 }, {
74 .name = "Adapter ROM",
75 .start = 0,
76 .end = 0,
77 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
78 }, {
79 .name = "Adapter ROM",
80 .start = 0,
81 .end = 0,
82 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
83 }, {
84 .name = "Adapter ROM",
85 .start = 0,
86 .end = 0,
87 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
88 }, {
89 .name = "Adapter ROM",
90 .start = 0,
91 .end = 0,
92 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
93 }, {
94 .name = "Adapter ROM",
95 .start = 0,
96 .end = 0,
97 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
98 } };
99
100 static struct resource video_rom_resource = {
101 .name = "Video ROM",
102 .start = 0xc0000,
103 .end = 0xc7fff,
104 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
105 };
106
107 static struct resource video_ram_resource = {
108 .name = "Video RAM area",
109 .start = 0xa0000,
110 .end = 0xbffff,
111 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
112 };
113
114 static struct resource standard_io_resources[] = { {
115 .name = "dma1",
116 .start = 0x0000,
117 .end = 0x001f,
118 .flags = IORESOURCE_BUSY | IORESOURCE_IO
119 }, {
120 .name = "pic1",
121 .start = 0x0020,
122 .end = 0x0021,
123 .flags = IORESOURCE_BUSY | IORESOURCE_IO
124 }, {
125 .name = "timer0",
126 .start = 0x0040,
127 .end = 0x0043,
128 .flags = IORESOURCE_BUSY | IORESOURCE_IO
129 }, {
130 .name = "timer1",
131 .start = 0x0050,
132 .end = 0x0053,
133 .flags = IORESOURCE_BUSY | IORESOURCE_IO
134 }, {
135 .name = "keyboard",
136 .start = 0x0060,
137 .end = 0x006f,
138 .flags = IORESOURCE_BUSY | IORESOURCE_IO
139 }, {
140 .name = "dma page reg",
141 .start = 0x0080,
142 .end = 0x008f,
143 .flags = IORESOURCE_BUSY | IORESOURCE_IO
144 }, {
145 .name = "pic2",
146 .start = 0x00a0,
147 .end = 0x00a1,
148 .flags = IORESOURCE_BUSY | IORESOURCE_IO
149 }, {
150 .name = "dma2",
151 .start = 0x00c0,
152 .end = 0x00df,
153 .flags = IORESOURCE_BUSY | IORESOURCE_IO
154 }, {
155 .name = "fpu",
156 .start = 0x00f0,
157 .end = 0x00ff,
158 .flags = IORESOURCE_BUSY | IORESOURCE_IO
159 } };
160
161 #define ROMSIGNATURE 0xaa55
162
163 static int __init romsignature(const unsigned char *rom)
164 {
165 const unsigned short * const ptr = (const unsigned short *)rom;
166 unsigned short sig;
167
168 return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
169 }
170
171 static int __init romchecksum(const unsigned char *rom, unsigned long length)
172 {
173 unsigned char sum, c;
174
175 for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
176 sum += c;
177 return !length && !sum;
178 }
179
180 static void __init probe_roms(void)
181 {
182 const unsigned char *rom;
183 unsigned long start, length, upper;
184 unsigned char c;
185 int i;
186
187 /* video rom */
188 upper = adapter_rom_resources[0].start;
189 for (start = video_rom_resource.start; start < upper; start += 2048) {
190 rom = isa_bus_to_virt(start);
191 if (!romsignature(rom))
192 continue;
193
194 video_rom_resource.start = start;
195
196 if (probe_kernel_address(rom + 2, c) != 0)
197 continue;
198
199 /* 0 < length <= 0x7f * 512, historically */
200 length = c * 512;
201
202 /* if checksum okay, trust length byte */
203 if (length && romchecksum(rom, length))
204 video_rom_resource.end = start + length - 1;
205
206 request_resource(&iomem_resource, &video_rom_resource);
207 break;
208 }
209
210 start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
211 if (start < upper)
212 start = upper;
213
214 /* system rom */
215 request_resource(&iomem_resource, &system_rom_resource);
216 upper = system_rom_resource.start;
217
218 /* check for extension rom (ignore length byte!) */
219 rom = isa_bus_to_virt(extension_rom_resource.start);
220 if (romsignature(rom)) {
221 length = extension_rom_resource.end - extension_rom_resource.start + 1;
222 if (romchecksum(rom, length)) {
223 request_resource(&iomem_resource, &extension_rom_resource);
224 upper = extension_rom_resource.start;
225 }
226 }
227
228 /* check for adapter roms on 2k boundaries */
229 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) {
230 rom = isa_bus_to_virt(start);
231 if (!romsignature(rom))
232 continue;
233
234 if (probe_kernel_address(rom + 2, c) != 0)
235 continue;
236
237 /* 0 < length <= 0x7f * 512, historically */
238 length = c * 512;
239
240 /* but accept any length that fits if checksum okay */
241 if (!length || start + length > upper || !romchecksum(rom, length))
242 continue;
243
244 adapter_rom_resources[i].start = start;
245 adapter_rom_resources[i].end = start + length - 1;
246 request_resource(&iomem_resource, &adapter_rom_resources[i]);
247
248 start = adapter_rom_resources[i++].end & ~2047UL;
249 }
250 }
251
252 /*
253 * Request address space for all standard RAM and ROM resources
254 * and also for regions reported as reserved by the e820.
255 */
256 static void __init
257 legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
258 {
259 int i;
260
261 probe_roms();
262 for (i = 0; i < e820.nr_map; i++) {
263 struct resource *res;
264 #ifndef CONFIG_RESOURCES_64BIT
265 if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
266 continue;
267 #endif
268 res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
269 switch (e820.map[i].type) {
270 case E820_RAM: res->name = "System RAM"; break;
271 case E820_ACPI: res->name = "ACPI Tables"; break;
272 case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
273 default: res->name = "reserved";
274 }
275 res->start = e820.map[i].addr;
276 res->end = res->start + e820.map[i].size - 1;
277 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
278 if (request_resource(&iomem_resource, res)) {
279 kfree(res);
280 continue;
281 }
282 if (e820.map[i].type == E820_RAM) {
283 /*
284 * We don't know which RAM region contains kernel data,
285 * so we try it repeatedly and let the resource manager
286 * test it.
287 */
288 request_resource(res, code_resource);
289 request_resource(res, data_resource);
290 #ifdef CONFIG_KEXEC
291 if (crashk_res.start != crashk_res.end)
292 request_resource(res, &crashk_res);
293 #endif
294 }
295 }
296 }
297
298 /*
299 * Request address space for all standard resources
300 *
301 * This is called just before pcibios_init(), which is also a
302 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
303 */
304 static int __init request_standard_resources(void)
305 {
306 int i;
307
308 printk("Setting up standard PCI resources\n");
309 if (efi_enabled)
310 efi_initialize_iomem_resources(&code_resource, &data_resource);
311 else
312 legacy_init_iomem_resources(&code_resource, &data_resource);
313
314 /* EFI systems may still have VGA */
315 request_resource(&iomem_resource, &video_ram_resource);
316
317 /* request I/O space for devices used on all i[345]86 PCs */
318 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
319 request_resource(&ioport_resource, &standard_io_resources[i]);
320 return 0;
321 }
322
323 subsys_initcall(request_standard_resources);
324
325 #if defined(CONFIG_PM) && defined(CONFIG_HIBERNATION)
326 /**
327 * e820_mark_nosave_regions - Find the ranges of physical addresses that do not
328 * correspond to e820 RAM areas and mark the corresponding pages as nosave for
329 * hibernation.
330 *
331 * This function requires the e820 map to be sorted and without any
332 * overlapping entries and assumes the first e820 area to be RAM.
333 */
334 void __init e820_mark_nosave_regions(void)
335 {
336 int i;
337 unsigned long pfn;
338
339 pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
340 for (i = 1; i < e820.nr_map; i++) {
341 struct e820entry *ei = &e820.map[i];
342
343 if (pfn < PFN_UP(ei->addr))
344 register_nosave_region(pfn, PFN_UP(ei->addr));
345
346 pfn = PFN_DOWN(ei->addr + ei->size);
347 if (ei->type != E820_RAM)
348 register_nosave_region(PFN_UP(ei->addr), pfn);
349
350 if (pfn >= max_low_pfn)
351 break;
352 }
353 }
354 #endif
355
356 void __init add_memory_region(unsigned long long start,
357 unsigned long long size, int type)
358 {
359 int x;
360
361 if (!efi_enabled) {
362 x = e820.nr_map;
363
364 if (x == E820MAX) {
365 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
366 return;
367 }
368
369 e820.map[x].addr = start;
370 e820.map[x].size = size;
371 e820.map[x].type = type;
372 e820.nr_map++;
373 }
374 } /* add_memory_region */
375
376 /*
377 * Sanitize the BIOS e820 map.
378 *
379 * Some e820 responses include overlapping entries. The following
380 * replaces the original e820 map with a new one, removing overlaps.
381 *
382 */
383 int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
384 {
385 struct change_member *change_tmp;
386 unsigned long current_type, last_type;
387 unsigned long long last_addr;
388 int chgidx, still_changing;
389 int overlap_entries;
390 int new_bios_entry;
391 int old_nr, new_nr, chg_nr;
392 int i;
393
394 /*
395 Visually we're performing the following (1,2,3,4 = memory types)...
396
397 Sample memory map (w/overlaps):
398 ____22__________________
399 ______________________4_
400 ____1111________________
401 _44_____________________
402 11111111________________
403 ____________________33__
404 ___________44___________
405 __________33333_________
406 ______________22________
407 ___________________2222_
408 _________111111111______
409 _____________________11_
410 _________________4______
411
412 Sanitized equivalent (no overlap):
413 1_______________________
414 _44_____________________
415 ___1____________________
416 ____22__________________
417 ______11________________
418 _________1______________
419 __________3_____________
420 ___________44___________
421 _____________33_________
422 _______________2________
423 ________________1_______
424 _________________4______
425 ___________________2____
426 ____________________33__
427 ______________________4_
428 */
429 /* if there's only one memory region, don't bother */
430 if (*pnr_map < 2) {
431 return -1;
432 }
433
434 old_nr = *pnr_map;
435
436 /* bail out if we find any unreasonable addresses in bios map */
437 for (i=0; i<old_nr; i++)
438 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) {
439 return -1;
440 }
441
442 /* create pointers for initial change-point information (for sorting) */
443 for (i=0; i < 2*old_nr; i++)
444 change_point[i] = &change_point_list[i];
445
446 /* record all known change-points (starting and ending addresses),
447 omitting those that are for empty memory regions */
448 chgidx = 0;
449 for (i=0; i < old_nr; i++) {
450 if (biosmap[i].size != 0) {
451 change_point[chgidx]->addr = biosmap[i].addr;
452 change_point[chgidx++]->pbios = &biosmap[i];
453 change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size;
454 change_point[chgidx++]->pbios = &biosmap[i];
455 }
456 }
457 chg_nr = chgidx; /* true number of change-points */
458
459 /* sort change-point list by memory addresses (low -> high) */
460 still_changing = 1;
461 while (still_changing) {
462 still_changing = 0;
463 for (i=1; i < chg_nr; i++) {
464 /* if <current_addr> > <last_addr>, swap */
465 /* or, if current=<start_addr> & last=<end_addr>, swap */
466 if ((change_point[i]->addr < change_point[i-1]->addr) ||
467 ((change_point[i]->addr == change_point[i-1]->addr) &&
468 (change_point[i]->addr == change_point[i]->pbios->addr) &&
469 (change_point[i-1]->addr != change_point[i-1]->pbios->addr))
470 )
471 {
472 change_tmp = change_point[i];
473 change_point[i] = change_point[i-1];
474 change_point[i-1] = change_tmp;
475 still_changing=1;
476 }
477 }
478 }
479
480 /* create a new bios memory map, removing overlaps */
481 overlap_entries=0; /* number of entries in the overlap table */
482 new_bios_entry=0; /* index for creating new bios map entries */
483 last_type = 0; /* start with undefined memory type */
484 last_addr = 0; /* start with 0 as last starting address */
485 /* loop through change-points, determining affect on the new bios map */
486 for (chgidx=0; chgidx < chg_nr; chgidx++)
487 {
488 /* keep track of all overlapping bios entries */
489 if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
490 {
491 /* add map entry to overlap list (> 1 entry implies an overlap) */
492 overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
493 }
494 else
495 {
496 /* remove entry from list (order independent, so swap with last) */
497 for (i=0; i<overlap_entries; i++)
498 {
499 if (overlap_list[i] == change_point[chgidx]->pbios)
500 overlap_list[i] = overlap_list[overlap_entries-1];
501 }
502 overlap_entries--;
503 }
504 /* if there are overlapping entries, decide which "type" to use */
505 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
506 current_type = 0;
507 for (i=0; i<overlap_entries; i++)
508 if (overlap_list[i]->type > current_type)
509 current_type = overlap_list[i]->type;
510 /* continue building up new bios map based on this information */
511 if (current_type != last_type) {
512 if (last_type != 0) {
513 new_bios[new_bios_entry].size =
514 change_point[chgidx]->addr - last_addr;
515 /* move forward only if the new size was non-zero */
516 if (new_bios[new_bios_entry].size != 0)
517 if (++new_bios_entry >= E820MAX)
518 break; /* no more space left for new bios entries */
519 }
520 if (current_type != 0) {
521 new_bios[new_bios_entry].addr = change_point[chgidx]->addr;
522 new_bios[new_bios_entry].type = current_type;
523 last_addr=change_point[chgidx]->addr;
524 }
525 last_type = current_type;
526 }
527 }
528 new_nr = new_bios_entry; /* retain count for new bios entries */
529
530 /* copy new bios mapping into original location */
531 memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
532 *pnr_map = new_nr;
533
534 return 0;
535 }
536
537 /*
538 * Copy the BIOS e820 map into a safe place.
539 *
540 * Sanity-check it while we're at it..
541 *
542 * If we're lucky and live on a modern system, the setup code
543 * will have given us a memory map that we can use to properly
544 * set up memory. If we aren't, we'll fake a memory map.
545 *
546 * We check to see that the memory map contains at least 2 elements
547 * before we'll use it, because the detection code in setup.S may
548 * not be perfect and most every PC known to man has two memory
549 * regions: one from 0 to 640k, and one from 1mb up. (The IBM
550 * thinkpad 560x, for example, does not cooperate with the memory
551 * detection code.)
552 */
553 int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
554 {
555 /* Only one memory region (or negative)? Ignore it */
556 if (nr_map < 2)
557 return -1;
558
559 do {
560 unsigned long long start = biosmap->addr;
561 unsigned long long size = biosmap->size;
562 unsigned long long end = start + size;
563 unsigned long type = biosmap->type;
564
565 /* Overflow in 64 bits? Ignore the memory map. */
566 if (start > end)
567 return -1;
568
569 /*
570 * Some BIOSes claim RAM in the 640k - 1M region.
571 * Not right. Fix it up.
572 */
573 if (type == E820_RAM) {
574 if (start < 0x100000ULL && end > 0xA0000ULL) {
575 if (start < 0xA0000ULL)
576 add_memory_region(start, 0xA0000ULL-start, type);
577 if (end <= 0x100000ULL)
578 continue;
579 start = 0x100000ULL;
580 size = end - start;
581 }
582 }
583 add_memory_region(start, size, type);
584 } while (biosmap++,--nr_map);
585 return 0;
586 }
587
588 /*
589 * Callback for efi_memory_walk.
590 */
591 static int __init
592 efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
593 {
594 unsigned long *max_pfn = arg, pfn;
595
596 if (start < end) {
597 pfn = PFN_UP(end -1);
598 if (pfn > *max_pfn)
599 *max_pfn = pfn;
600 }
601 return 0;
602 }
603
604 static int __init
605 efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
606 {
607 memory_present(0, PFN_UP(start), PFN_DOWN(end));
608 return 0;
609 }
610
611 /*
612 * Find the highest page frame number we have available
613 */
614 void __init find_max_pfn(void)
615 {
616 int i;
617
618 max_pfn = 0;
619 if (efi_enabled) {
620 efi_memmap_walk(efi_find_max_pfn, &max_pfn);
621 efi_memmap_walk(efi_memory_present_wrapper, NULL);
622 return;
623 }
624
625 for (i = 0; i < e820.nr_map; i++) {
626 unsigned long start, end;
627 /* RAM? */
628 if (e820.map[i].type != E820_RAM)
629 continue;
630 start = PFN_UP(e820.map[i].addr);
631 end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
632 if (start >= end)
633 continue;
634 if (end > max_pfn)
635 max_pfn = end;
636 memory_present(0, start, end);
637 }
638 }
639
640 /*
641 * Free all available memory for boot time allocation. Used
642 * as a callback function by efi_memory_walk()
643 */
644
645 static int __init
646 free_available_memory(unsigned long start, unsigned long end, void *arg)
647 {
648 /* check max_low_pfn */
649 if (start >= (max_low_pfn << PAGE_SHIFT))
650 return 0;
651 if (end >= (max_low_pfn << PAGE_SHIFT))
652 end = max_low_pfn << PAGE_SHIFT;
653 if (start < end)
654 free_bootmem(start, end - start);
655
656 return 0;
657 }
658 /*
659 * Register fully available low RAM pages with the bootmem allocator.
660 */
661 void __init register_bootmem_low_pages(unsigned long max_low_pfn)
662 {
663 int i;
664
665 if (efi_enabled) {
666 efi_memmap_walk(free_available_memory, NULL);
667 return;
668 }
669 for (i = 0; i < e820.nr_map; i++) {
670 unsigned long curr_pfn, last_pfn, size;
671 /*
672 * Reserve usable low memory
673 */
674 if (e820.map[i].type != E820_RAM)
675 continue;
676 /*
677 * We are rounding up the start address of usable memory:
678 */
679 curr_pfn = PFN_UP(e820.map[i].addr);
680 if (curr_pfn >= max_low_pfn)
681 continue;
682 /*
683 * ... and at the end of the usable range downwards:
684 */
685 last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
686
687 if (last_pfn > max_low_pfn)
688 last_pfn = max_low_pfn;
689
690 /*
691 * .. finally, did all the rounding and playing
692 * around just make the area go away?
693 */
694 if (last_pfn <= curr_pfn)
695 continue;
696
697 size = last_pfn - curr_pfn;
698 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
699 }
700 }
701
702 void __init e820_register_memory(void)
703 {
704 unsigned long gapstart, gapsize, round;
705 unsigned long long last;
706 int i;
707
708 /*
709 * Search for the bigest gap in the low 32 bits of the e820
710 * memory space.
711 */
712 last = 0x100000000ull;
713 gapstart = 0x10000000;
714 gapsize = 0x400000;
715 i = e820.nr_map;
716 while (--i >= 0) {
717 unsigned long long start = e820.map[i].addr;
718 unsigned long long end = start + e820.map[i].size;
719
720 /*
721 * Since "last" is at most 4GB, we know we'll
722 * fit in 32 bits if this condition is true
723 */
724 if (last > end) {
725 unsigned long gap = last - end;
726
727 if (gap > gapsize) {
728 gapsize = gap;
729 gapstart = end;
730 }
731 }
732 if (start < last)
733 last = start;
734 }
735
736 /*
737 * See how much we want to round up: start off with
738 * rounding to the next 1MB area.
739 */
740 round = 0x100000;
741 while ((gapsize >> 4) > round)
742 round += round;
743 /* Fun with two's complement */
744 pci_mem_start = (gapstart + round) & -round;
745
746 printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
747 pci_mem_start, gapstart, gapsize);
748 }
749
750 void __init print_memory_map(char *who)
751 {
752 int i;
753
754 for (i = 0; i < e820.nr_map; i++) {
755 printk(" %s: %016Lx - %016Lx ", who,
756 e820.map[i].addr,
757 e820.map[i].addr + e820.map[i].size);
758 switch (e820.map[i].type) {
759 case E820_RAM: printk("(usable)\n");
760 break;
761 case E820_RESERVED:
762 printk("(reserved)\n");
763 break;
764 case E820_ACPI:
765 printk("(ACPI data)\n");
766 break;
767 case E820_NVS:
768 printk("(ACPI NVS)\n");
769 break;
770 default: printk("type %u\n", e820.map[i].type);
771 break;
772 }
773 }
774 }
775
776 static __init __always_inline void efi_limit_regions(unsigned long long size)
777 {
778 unsigned long long current_addr = 0;
779 efi_memory_desc_t *md, *next_md;
780 void *p, *p1;
781 int i, j;
782
783 j = 0;
784 p1 = memmap.map;
785 for (p = p1, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) {
786 md = p;
787 next_md = p1;
788 current_addr = md->phys_addr +
789 PFN_PHYS(md->num_pages);
790 if (is_available_memory(md)) {
791 if (md->phys_addr >= size) continue;
792 memcpy(next_md, md, memmap.desc_size);
793 if (current_addr >= size) {
794 next_md->num_pages -=
795 PFN_UP(current_addr-size);
796 }
797 p1 += memmap.desc_size;
798 next_md = p1;
799 j++;
800 } else if ((md->attribute & EFI_MEMORY_RUNTIME) ==
801 EFI_MEMORY_RUNTIME) {
802 /* In order to make runtime services
803 * available we have to include runtime
804 * memory regions in memory map */
805 memcpy(next_md, md, memmap.desc_size);
806 p1 += memmap.desc_size;
807 next_md = p1;
808 j++;
809 }
810 }
811 memmap.nr_map = j;
812 memmap.map_end = memmap.map +
813 (memmap.nr_map * memmap.desc_size);
814 }
815
816 void __init limit_regions(unsigned long long size)
817 {
818 unsigned long long current_addr;
819 int i;
820
821 print_memory_map("limit_regions start");
822 if (efi_enabled) {
823 efi_limit_regions(size);
824 return;
825 }
826 for (i = 0; i < e820.nr_map; i++) {
827 current_addr = e820.map[i].addr + e820.map[i].size;
828 if (current_addr < size)
829 continue;
830
831 if (e820.map[i].type != E820_RAM)
832 continue;
833
834 if (e820.map[i].addr >= size) {
835 /*
836 * This region starts past the end of the
837 * requested size, skip it completely.
838 */
839 e820.nr_map = i;
840 } else {
841 e820.nr_map = i + 1;
842 e820.map[i].size -= current_addr - size;
843 }
844 print_memory_map("limit_regions endfor");
845 return;
846 }
847 print_memory_map("limit_regions endfunc");
848 }
849
850 /*
851 * This function checks if any part of the range <start,end> is mapped
852 * with type.
853 */
854 int
855 e820_any_mapped(u64 start, u64 end, unsigned type)
856 {
857 int i;
858 for (i = 0; i < e820.nr_map; i++) {
859 const struct e820entry *ei = &e820.map[i];
860 if (type && ei->type != type)
861 continue;
862 if (ei->addr >= end || ei->addr + ei->size <= start)
863 continue;
864 return 1;
865 }
866 return 0;
867 }
868 EXPORT_SYMBOL_GPL(e820_any_mapped);
869
870 /*
871 * This function checks if the entire range <start,end> is mapped with type.
872 *
873 * Note: this function only works correct if the e820 table is sorted and
874 * not-overlapping, which is the case
875 */
876 int __init
877 e820_all_mapped(unsigned long s, unsigned long e, unsigned type)
878 {
879 u64 start = s;
880 u64 end = e;
881 int i;
882 for (i = 0; i < e820.nr_map; i++) {
883 struct e820entry *ei = &e820.map[i];
884 if (type && ei->type != type)
885 continue;
886 /* is the region (part) in overlap with the current region ?*/
887 if (ei->addr >= end || ei->addr + ei->size <= start)
888 continue;
889 /* if the region is at the beginning of <start,end> we move
890 * start to the end of the region since it's ok until there
891 */
892 if (ei->addr <= start)
893 start = ei->addr + ei->size;
894 /* if start is now at or beyond end, we're done, full
895 * coverage */
896 if (start >= end)
897 return 1; /* we're done */
898 }
899 return 0;
900 }
901
902 static int __init parse_memmap(char *arg)
903 {
904 if (!arg)
905 return -EINVAL;
906
907 if (strcmp(arg, "exactmap") == 0) {
908 #ifdef CONFIG_CRASH_DUMP
909 /* If we are doing a crash dump, we
910 * still need to know the real mem
911 * size before original memory map is
912 * reset.
913 */
914 find_max_pfn();
915 saved_max_pfn = max_pfn;
916 #endif
917 e820.nr_map = 0;
918 user_defined_memmap = 1;
919 } else {
920 /* If the user specifies memory size, we
921 * limit the BIOS-provided memory map to
922 * that size. exactmap can be used to specify
923 * the exact map. mem=number can be used to
924 * trim the existing memory map.
925 */
926 unsigned long long start_at, mem_size;
927
928 mem_size = memparse(arg, &arg);
929 if (*arg == '@') {
930 start_at = memparse(arg+1, &arg);
931 add_memory_region(start_at, mem_size, E820_RAM);
932 } else if (*arg == '#') {
933 start_at = memparse(arg+1, &arg);
934 add_memory_region(start_at, mem_size, E820_ACPI);
935 } else if (*arg == '$') {
936 start_at = memparse(arg+1, &arg);
937 add_memory_region(start_at, mem_size, E820_RESERVED);
938 } else {
939 limit_regions(mem_size);
940 user_defined_memmap = 1;
941 }
942 }
943 return 0;
944 }
945 early_param("memmap", parse_memmap);
Linux kernel - Deliverables
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