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1/*
2 * Handle the memory map.
3 * The functions here do the job until bootmem takes over.
4 *
5 * Getting sanitize_e820_map() in sync with i386 version by applying change:
6 * - Provisions for empty E820 memory regions (reported by certain BIOSes).
7 * Alex Achenbach <xela@slit.de>, December 2002.
8 * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
9 *
10 */
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/init.h>
14#include <linux/crash_dump.h>
15#include <linux/bootmem.h>
16#include <linux/pfn.h>
17#include <linux/suspend.h>
18#include <linux/acpi.h>
19#include <linux/firmware-map.h>
20#include <linux/memblock.h>
21
22#include <asm/e820.h>
23#include <asm/proto.h>
24#include <asm/setup.h>
25
26/*
27 * The e820 map is the map that gets modified e.g. with command line parameters
28 * and that is also registered with modifications in the kernel resource tree
29 * with the iomem_resource as parent.
30 *
31 * The e820_saved is directly saved after the BIOS-provided memory map is
32 * copied. It doesn't get modified afterwards. It's registered for the
33 * /sys/firmware/memmap interface.
34 *
35 * That memory map is not modified and is used as base for kexec. The kexec'd
36 * kernel should get the same memory map as the firmware provides. Then the
37 * user can e.g. boot the original kernel with mem=1G while still booting the
38 * next kernel with full memory.
39 */
40struct e820map e820;
41struct e820map e820_saved;
42
43/* For PCI or other memory-mapped resources */
44unsigned long pci_mem_start = 0xaeedbabe;
45#ifdef CONFIG_PCI
46EXPORT_SYMBOL(pci_mem_start);
47#endif
48
49/*
50 * This function checks if any part of the range <start,end> is mapped
51 * with type.
52 */
53int
54e820_any_mapped(u64 start, u64 end, unsigned type)
55{
56 int i;
57
58 for (i = 0; i < e820.nr_map; i++) {
59 struct e820entry *ei = &e820.map[i];
60
61 if (type && ei->type != type)
62 continue;
63 if (ei->addr >= end || ei->addr + ei->size <= start)
64 continue;
65 return 1;
66 }
67 return 0;
68}
69EXPORT_SYMBOL_GPL(e820_any_mapped);
70
71/*
72 * This function checks if the entire range <start,end> is mapped with type.
73 *
74 * Note: this function only works correct if the e820 table is sorted and
75 * not-overlapping, which is the case
76 */
77int __init e820_all_mapped(u64 start, u64 end, unsigned type)
78{
79 int i;
80
81 for (i = 0; i < e820.nr_map; i++) {
82 struct e820entry *ei = &e820.map[i];
83
84 if (type && ei->type != type)
85 continue;
86 /* is the region (part) in overlap with the current region ?*/
87 if (ei->addr >= end || ei->addr + ei->size <= start)
88 continue;
89
90 /* if the region is at the beginning of <start,end> we move
91 * start to the end of the region since it's ok until there
92 */
93 if (ei->addr <= start)
94 start = ei->addr + ei->size;
95 /*
96 * if start is now at or beyond end, we're done, full
97 * coverage
98 */
99 if (start >= end)
100 return 1;
101 }
102 return 0;
103}
104
105/*
106 * Add a memory region to the kernel e820 map.
107 */
108static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size,
109 int type)
110{
111 int x = e820x->nr_map;
112
113 if (x >= ARRAY_SIZE(e820x->map)) {
114 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
115 return;
116 }
117
118 e820x->map[x].addr = start;
119 e820x->map[x].size = size;
120 e820x->map[x].type = type;
121 e820x->nr_map++;
122}
123
124void __init e820_add_region(u64 start, u64 size, int type)
125{
126 __e820_add_region(&e820, start, size, type);
127}
128
129static void __init e820_print_type(u32 type)
130{
131 switch (type) {
132 case E820_RAM:
133 case E820_RESERVED_KERN:
134 printk(KERN_CONT "(usable)");
135 break;
136 case E820_RESERVED:
137 printk(KERN_CONT "(reserved)");
138 break;
139 case E820_ACPI:
140 printk(KERN_CONT "(ACPI data)");
141 break;
142 case E820_NVS:
143 printk(KERN_CONT "(ACPI NVS)");
144 break;
145 case E820_UNUSABLE:
146 printk(KERN_CONT "(unusable)");
147 break;
148 default:
149 printk(KERN_CONT "type %u", type);
150 break;
151 }
152}
153
154void __init e820_print_map(char *who)
155{
156 int i;
157
158 for (i = 0; i < e820.nr_map; i++) {
159 printk(KERN_INFO " %s: %016Lx - %016Lx ", who,
160 (unsigned long long) e820.map[i].addr,
161 (unsigned long long)
162 (e820.map[i].addr + e820.map[i].size));
163 e820_print_type(e820.map[i].type);
164 printk(KERN_CONT "\n");
165 }
166}
167
168/*
169 * Sanitize the BIOS e820 map.
170 *
171 * Some e820 responses include overlapping entries. The following
172 * replaces the original e820 map with a new one, removing overlaps,
173 * and resolving conflicting memory types in favor of highest
174 * numbered type.
175 *
176 * The input parameter biosmap points to an array of 'struct
177 * e820entry' which on entry has elements in the range [0, *pnr_map)
178 * valid, and which has space for up to max_nr_map entries.
179 * On return, the resulting sanitized e820 map entries will be in
180 * overwritten in the same location, starting at biosmap.
181 *
182 * The integer pointed to by pnr_map must be valid on entry (the
183 * current number of valid entries located at biosmap) and will
184 * be updated on return, with the new number of valid entries
185 * (something no more than max_nr_map.)
186 *
187 * The return value from sanitize_e820_map() is zero if it
188 * successfully 'sanitized' the map entries passed in, and is -1
189 * if it did nothing, which can happen if either of (1) it was
190 * only passed one map entry, or (2) any of the input map entries
191 * were invalid (start + size < start, meaning that the size was
192 * so big the described memory range wrapped around through zero.)
193 *
194 * Visually we're performing the following
195 * (1,2,3,4 = memory types)...
196 *
197 * Sample memory map (w/overlaps):
198 * ____22__________________
199 * ______________________4_
200 * ____1111________________
201 * _44_____________________
202 * 11111111________________
203 * ____________________33__
204 * ___________44___________
205 * __________33333_________
206 * ______________22________
207 * ___________________2222_
208 * _________111111111______
209 * _____________________11_
210 * _________________4______
211 *
212 * Sanitized equivalent (no overlap):
213 * 1_______________________
214 * _44_____________________
215 * ___1____________________
216 * ____22__________________
217 * ______11________________
218 * _________1______________
219 * __________3_____________
220 * ___________44___________
221 * _____________33_________
222 * _______________2________
223 * ________________1_______
224 * _________________4______
225 * ___________________2____
226 * ____________________33__
227 * ______________________4_
228 */
229
230int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
231 u32 *pnr_map)
232{
233 struct change_member {
234 struct e820entry *pbios; /* pointer to original bios entry */
235 unsigned long long addr; /* address for this change point */
236 };
237 static struct change_member change_point_list[2*E820_X_MAX] __initdata;
238 static struct change_member *change_point[2*E820_X_MAX] __initdata;
239 static struct e820entry *overlap_list[E820_X_MAX] __initdata;
240 static struct e820entry new_bios[E820_X_MAX] __initdata;
241 struct change_member *change_tmp;
242 unsigned long current_type, last_type;
243 unsigned long long last_addr;
244 int chgidx, still_changing;
245 int overlap_entries;
246 int new_bios_entry;
247 int old_nr, new_nr, chg_nr;
248 int i;
249
250 /* if there's only one memory region, don't bother */
251 if (*pnr_map < 2)
252 return -1;
253
254 old_nr = *pnr_map;
255 BUG_ON(old_nr > max_nr_map);
256
257 /* bail out if we find any unreasonable addresses in bios map */
258 for (i = 0; i < old_nr; i++)
259 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
260 return -1;
261
262 /* create pointers for initial change-point information (for sorting) */
263 for (i = 0; i < 2 * old_nr; i++)
264 change_point[i] = &change_point_list[i];
265
266 /* record all known change-points (starting and ending addresses),
267 omitting those that are for empty memory regions */
268 chgidx = 0;
269 for (i = 0; i < old_nr; i++) {
270 if (biosmap[i].size != 0) {
271 change_point[chgidx]->addr = biosmap[i].addr;
272 change_point[chgidx++]->pbios = &biosmap[i];
273 change_point[chgidx]->addr = biosmap[i].addr +
274 biosmap[i].size;
275 change_point[chgidx++]->pbios = &biosmap[i];
276 }
277 }
278 chg_nr = chgidx;
279
280 /* sort change-point list by memory addresses (low -> high) */
281 still_changing = 1;
282 while (still_changing) {
283 still_changing = 0;
284 for (i = 1; i < chg_nr; i++) {
285 unsigned long long curaddr, lastaddr;
286 unsigned long long curpbaddr, lastpbaddr;
287
288 curaddr = change_point[i]->addr;
289 lastaddr = change_point[i - 1]->addr;
290 curpbaddr = change_point[i]->pbios->addr;
291 lastpbaddr = change_point[i - 1]->pbios->addr;
292
293 /*
294 * swap entries, when:
295 *
296 * curaddr > lastaddr or
297 * curaddr == lastaddr and curaddr == curpbaddr and
298 * lastaddr != lastpbaddr
299 */
300 if (curaddr < lastaddr ||
301 (curaddr == lastaddr && curaddr == curpbaddr &&
302 lastaddr != lastpbaddr)) {
303 change_tmp = change_point[i];
304 change_point[i] = change_point[i-1];
305 change_point[i-1] = change_tmp;
306 still_changing = 1;
307 }
308 }
309 }
310
311 /* create a new bios memory map, removing overlaps */
312 overlap_entries = 0; /* number of entries in the overlap table */
313 new_bios_entry = 0; /* index for creating new bios map entries */
314 last_type = 0; /* start with undefined memory type */
315 last_addr = 0; /* start with 0 as last starting address */
316
317 /* loop through change-points, determining affect on the new bios map */
318 for (chgidx = 0; chgidx < chg_nr; chgidx++) {
319 /* keep track of all overlapping bios entries */
320 if (change_point[chgidx]->addr ==
321 change_point[chgidx]->pbios->addr) {
322 /*
323 * add map entry to overlap list (> 1 entry
324 * implies an overlap)
325 */
326 overlap_list[overlap_entries++] =
327 change_point[chgidx]->pbios;
328 } else {
329 /*
330 * remove entry from list (order independent,
331 * so swap with last)
332 */
333 for (i = 0; i < overlap_entries; i++) {
334 if (overlap_list[i] ==
335 change_point[chgidx]->pbios)
336 overlap_list[i] =
337 overlap_list[overlap_entries-1];
338 }
339 overlap_entries--;
340 }
341 /*
342 * if there are overlapping entries, decide which
343 * "type" to use (larger value takes precedence --
344 * 1=usable, 2,3,4,4+=unusable)
345 */
346 current_type = 0;
347 for (i = 0; i < overlap_entries; i++)
348 if (overlap_list[i]->type > current_type)
349 current_type = overlap_list[i]->type;
350 /*
351 * continue building up new bios map based on this
352 * information
353 */
354 if (current_type != last_type) {
355 if (last_type != 0) {
356 new_bios[new_bios_entry].size =
357 change_point[chgidx]->addr - last_addr;
358 /*
359 * move forward only if the new size
360 * was non-zero
361 */
362 if (new_bios[new_bios_entry].size != 0)
363 /*
364 * no more space left for new
365 * bios entries ?
366 */
367 if (++new_bios_entry >= max_nr_map)
368 break;
369 }
370 if (current_type != 0) {
371 new_bios[new_bios_entry].addr =
372 change_point[chgidx]->addr;
373 new_bios[new_bios_entry].type = current_type;
374 last_addr = change_point[chgidx]->addr;
375 }
376 last_type = current_type;
377 }
378 }
379 /* retain count for new bios entries */
380 new_nr = new_bios_entry;
381
382 /* copy new bios mapping into original location */
383 memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry));
384 *pnr_map = new_nr;
385
386 return 0;
387}
388
389static int __init __append_e820_map(struct e820entry *biosmap, int nr_map)
390{
391 while (nr_map) {
392 u64 start = biosmap->addr;
393 u64 size = biosmap->size;
394 u64 end = start + size;
395 u32 type = biosmap->type;
396
397 /* Overflow in 64 bits? Ignore the memory map. */
398 if (start > end)
399 return -1;
400
401 e820_add_region(start, size, type);
402
403 biosmap++;
404 nr_map--;
405 }
406 return 0;
407}
408
409/*
410 * Copy the BIOS e820 map into a safe place.
411 *
412 * Sanity-check it while we're at it..
413 *
414 * If we're lucky and live on a modern system, the setup code
415 * will have given us a memory map that we can use to properly
416 * set up memory. If we aren't, we'll fake a memory map.
417 */
418static int __init append_e820_map(struct e820entry *biosmap, int nr_map)
419{
420 /* Only one memory region (or negative)? Ignore it */
421 if (nr_map < 2)
422 return -1;
423
424 return __append_e820_map(biosmap, nr_map);
425}
426
427static u64 __init __e820_update_range(struct e820map *e820x, u64 start,
428 u64 size, unsigned old_type,
429 unsigned new_type)
430{
431 u64 end;
432 unsigned int i;
433 u64 real_updated_size = 0;
434
435 BUG_ON(old_type == new_type);
436
437 if (size > (ULLONG_MAX - start))
438 size = ULLONG_MAX - start;
439
440 end = start + size;
441 printk(KERN_DEBUG "e820 update range: %016Lx - %016Lx ",
442 (unsigned long long) start,
443 (unsigned long long) end);
444 e820_print_type(old_type);
445 printk(KERN_CONT " ==> ");
446 e820_print_type(new_type);
447 printk(KERN_CONT "\n");
448
449 for (i = 0; i < e820x->nr_map; i++) {
450 struct e820entry *ei = &e820x->map[i];
451 u64 final_start, final_end;
452 u64 ei_end;
453
454 if (ei->type != old_type)
455 continue;
456
457 ei_end = ei->addr + ei->size;
458 /* totally covered by new range? */
459 if (ei->addr >= start && ei_end <= end) {
460 ei->type = new_type;
461 real_updated_size += ei->size;
462 continue;
463 }
464
465 /* new range is totally covered? */
466 if (ei->addr < start && ei_end > end) {
467 __e820_add_region(e820x, start, size, new_type);
468 __e820_add_region(e820x, end, ei_end - end, ei->type);
469 ei->size = start - ei->addr;
470 real_updated_size += size;
471 continue;
472 }
473
474 /* partially covered */
475 final_start = max(start, ei->addr);
476 final_end = min(end, ei_end);
477 if (final_start >= final_end)
478 continue;
479
480 __e820_add_region(e820x, final_start, final_end - final_start,
481 new_type);
482
483 real_updated_size += final_end - final_start;
484
485 /*
486 * left range could be head or tail, so need to update
487 * size at first.
488 */
489 ei->size -= final_end - final_start;
490 if (ei->addr < final_start)
491 continue;
492 ei->addr = final_end;
493 }
494 return real_updated_size;
495}
496
497u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
498 unsigned new_type)
499{
500 return __e820_update_range(&e820, start, size, old_type, new_type);
501}
502
503static u64 __init e820_update_range_saved(u64 start, u64 size,
504 unsigned old_type, unsigned new_type)
505{
506 return __e820_update_range(&e820_saved, start, size, old_type,
507 new_type);
508}
509
510/* make e820 not cover the range */
511u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type,
512 int checktype)
513{
514 int i;
515 u64 end;
516 u64 real_removed_size = 0;
517
518 if (size > (ULLONG_MAX - start))
519 size = ULLONG_MAX - start;
520
521 end = start + size;
522 printk(KERN_DEBUG "e820 remove range: %016Lx - %016Lx ",
523 (unsigned long long) start,
524 (unsigned long long) end);
525 if (checktype)
526 e820_print_type(old_type);
527 printk(KERN_CONT "\n");
528
529 for (i = 0; i < e820.nr_map; i++) {
530 struct e820entry *ei = &e820.map[i];
531 u64 final_start, final_end;
532 u64 ei_end;
533
534 if (checktype && ei->type != old_type)
535 continue;
536
537 ei_end = ei->addr + ei->size;
538 /* totally covered? */
539 if (ei->addr >= start && ei_end <= end) {
540 real_removed_size += ei->size;
541 memset(ei, 0, sizeof(struct e820entry));
542 continue;
543 }
544
545 /* new range is totally covered? */
546 if (ei->addr < start && ei_end > end) {
547 e820_add_region(end, ei_end - end, ei->type);
548 ei->size = start - ei->addr;
549 real_removed_size += size;
550 continue;
551 }
552
553 /* partially covered */
554 final_start = max(start, ei->addr);
555 final_end = min(end, ei_end);
556 if (final_start >= final_end)
557 continue;
558 real_removed_size += final_end - final_start;
559
560 /*
561 * left range could be head or tail, so need to update
562 * size at first.
563 */
564 ei->size -= final_end - final_start;
565 if (ei->addr < final_start)
566 continue;
567 ei->addr = final_end;
568 }
569 return real_removed_size;
570}
571
572void __init update_e820(void)
573{
574 u32 nr_map;
575
576 nr_map = e820.nr_map;
577 if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))
578 return;
579 e820.nr_map = nr_map;
580 printk(KERN_INFO "modified physical RAM map:\n");
581 e820_print_map("modified");
582}
583static void __init update_e820_saved(void)
584{
585 u32 nr_map;
586
587 nr_map = e820_saved.nr_map;
588 if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map))
589 return;
590 e820_saved.nr_map = nr_map;
591}
592#define MAX_GAP_END 0x100000000ull
593/*
594 * Search for a gap in the e820 memory space from start_addr to end_addr.
595 */
596__init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
597 unsigned long start_addr, unsigned long long end_addr)
598{
599 unsigned long long last;
600 int i = e820.nr_map;
601 int found = 0;
602
603 last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END;
604
605 while (--i >= 0) {
606 unsigned long long start = e820.map[i].addr;
607 unsigned long long end = start + e820.map[i].size;
608
609 if (end < start_addr)
610 continue;
611
612 /*
613 * Since "last" is at most 4GB, we know we'll
614 * fit in 32 bits if this condition is true
615 */
616 if (last > end) {
617 unsigned long gap = last - end;
618
619 if (gap >= *gapsize) {
620 *gapsize = gap;
621 *gapstart = end;
622 found = 1;
623 }
624 }
625 if (start < last)
626 last = start;
627 }
628 return found;
629}
630
631/*
632 * Search for the biggest gap in the low 32 bits of the e820
633 * memory space. We pass this space to PCI to assign MMIO resources
634 * for hotplug or unconfigured devices in.
635 * Hopefully the BIOS let enough space left.
636 */
637__init void e820_setup_gap(void)
638{
639 unsigned long gapstart, gapsize;
640 int found;
641
642 gapstart = 0x10000000;
643 gapsize = 0x400000;
644 found = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END);
645
646#ifdef CONFIG_X86_64
647 if (!found) {
648 gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024;
649 printk(KERN_ERR
650 "PCI: Warning: Cannot find a gap in the 32bit address range\n"
651 "PCI: Unassigned devices with 32bit resource registers may break!\n");
652 }
653#endif
654
655 /*
656 * e820_reserve_resources_late protect stolen RAM already
657 */
658 pci_mem_start = gapstart;
659
660 printk(KERN_INFO
661 "Allocating PCI resources starting at %lx (gap: %lx:%lx)\n",
662 pci_mem_start, gapstart, gapsize);
663}
664
665/**
666 * Because of the size limitation of struct boot_params, only first
667 * 128 E820 memory entries are passed to kernel via
668 * boot_params.e820_map, others are passed via SETUP_E820_EXT node of
669 * linked list of struct setup_data, which is parsed here.
670 */
671void __init parse_e820_ext(struct setup_data *sdata)
672{
673 int entries;
674 struct e820entry *extmap;
675
676 entries = sdata->len / sizeof(struct e820entry);
677 extmap = (struct e820entry *)(sdata->data);
678 __append_e820_map(extmap, entries);
679 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
680 printk(KERN_INFO "extended physical RAM map:\n");
681 e820_print_map("extended");
682}
683
684#if defined(CONFIG_X86_64) || \
685 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
686/**
687 * Find the ranges of physical addresses that do not correspond to
688 * e820 RAM areas and mark the corresponding pages as nosave for
689 * hibernation (32 bit) or software suspend and suspend to RAM (64 bit).
690 *
691 * This function requires the e820 map to be sorted and without any
692 * overlapping entries and assumes the first e820 area to be RAM.
693 */
694void __init e820_mark_nosave_regions(unsigned long limit_pfn)
695{
696 int i;
697 unsigned long pfn;
698
699 pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
700 for (i = 1; i < e820.nr_map; i++) {
701 struct e820entry *ei = &e820.map[i];
702
703 if (pfn < PFN_UP(ei->addr))
704 register_nosave_region(pfn, PFN_UP(ei->addr));
705
706 pfn = PFN_DOWN(ei->addr + ei->size);
707 if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
708 register_nosave_region(PFN_UP(ei->addr), pfn);
709
710 if (pfn >= limit_pfn)
711 break;
712 }
713}
714#endif
715
716#ifdef CONFIG_HIBERNATION
717/**
718 * Mark ACPI NVS memory region, so that we can save/restore it during
719 * hibernation and the subsequent resume.
720 */
721static int __init e820_mark_nvs_memory(void)
722{
723 int i;
724
725 for (i = 0; i < e820.nr_map; i++) {
726 struct e820entry *ei = &e820.map[i];
727
728 if (ei->type == E820_NVS)
729 suspend_nvs_register(ei->addr, ei->size);
730 }
731
732 return 0;
733}
734core_initcall(e820_mark_nvs_memory);
735#endif
736
737/*
738 * pre allocated 4k and reserved it in memblock and e820_saved
739 */
740u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align)
741{
742 u64 size = 0;
743 u64 addr;
744 u64 start;
745
746 for (start = startt; ; start += size) {
747 start = memblock_x86_find_in_range_size(start, &size, align);
748 if (start == MEMBLOCK_ERROR)
749 return 0;
750 if (size >= sizet)
751 break;
752 }
753
754#ifdef CONFIG_X86_32
755 if (start >= MAXMEM)
756 return 0;
757 if (start + size > MAXMEM)
758 size = MAXMEM - start;
759#endif
760
761 addr = round_down(start + size - sizet, align);
762 if (addr < start)
763 return 0;
764 memblock_x86_reserve_range(addr, addr + sizet, "new next");
765 e820_update_range_saved(addr, sizet, E820_RAM, E820_RESERVED);
766 printk(KERN_INFO "update e820_saved for early_reserve_e820\n");
767 update_e820_saved();
768
769 return addr;
770}
771
772#ifdef CONFIG_X86_32
773# ifdef CONFIG_X86_PAE
774# define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT))
775# else
776# define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT))
777# endif
778#else /* CONFIG_X86_32 */
779# define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT
780#endif
781
782/*
783 * Find the highest page frame number we have available
784 */
785static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
786{
787 int i;
788 unsigned long last_pfn = 0;
789 unsigned long max_arch_pfn = MAX_ARCH_PFN;
790
791 for (i = 0; i < e820.nr_map; i++) {
792 struct e820entry *ei = &e820.map[i];
793 unsigned long start_pfn;
794 unsigned long end_pfn;
795
796 if (ei->type != type)
797 continue;
798
799 start_pfn = ei->addr >> PAGE_SHIFT;
800 end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT;
801
802 if (start_pfn >= limit_pfn)
803 continue;
804 if (end_pfn > limit_pfn) {
805 last_pfn = limit_pfn;
806 break;
807 }
808 if (end_pfn > last_pfn)
809 last_pfn = end_pfn;
810 }
811
812 if (last_pfn > max_arch_pfn)
813 last_pfn = max_arch_pfn;
814
815 printk(KERN_INFO "last_pfn = %#lx max_arch_pfn = %#lx\n",
816 last_pfn, max_arch_pfn);
817 return last_pfn;
818}
819unsigned long __init e820_end_of_ram_pfn(void)
820{
821 return e820_end_pfn(MAX_ARCH_PFN, E820_RAM);
822}
823
824unsigned long __init e820_end_of_low_ram_pfn(void)
825{
826 return e820_end_pfn(1UL<<(32 - PAGE_SHIFT), E820_RAM);
827}
828
829static void early_panic(char *msg)
830{
831 early_printk(msg);
832 panic(msg);
833}
834
835static int userdef __initdata;
836
837/* "mem=nopentium" disables the 4MB page tables. */
838static int __init parse_memopt(char *p)
839{
840 u64 mem_size;
841
842 if (!p)
843 return -EINVAL;
844
845 if (!strcmp(p, "nopentium")) {
846#ifdef CONFIG_X86_32
847 setup_clear_cpu_cap(X86_FEATURE_PSE);
848 return 0;
849#else
850 printk(KERN_WARNING "mem=nopentium ignored! (only supported on x86_32)\n");
851 return -EINVAL;
852#endif
853 }
854
855 userdef = 1;
856 mem_size = memparse(p, &p);
857 /* don't remove all of memory when handling "mem={invalid}" param */
858 if (mem_size == 0)
859 return -EINVAL;
860 e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
861
862 return 0;
863}
864early_param("mem", parse_memopt);
865
866static int __init parse_memmap_opt(char *p)
867{
868 char *oldp;
869 u64 start_at, mem_size;
870
871 if (!p)
872 return -EINVAL;
873
874 if (!strncmp(p, "exactmap", 8)) {
875#ifdef CONFIG_CRASH_DUMP
876 /*
877 * If we are doing a crash dump, we still need to know
878 * the real mem size before original memory map is
879 * reset.
880 */
881 saved_max_pfn = e820_end_of_ram_pfn();
882#endif
883 e820.nr_map = 0;
884 userdef = 1;
885 return 0;
886 }
887
888 oldp = p;
889 mem_size = memparse(p, &p);
890 if (p == oldp)
891 return -EINVAL;
892
893 userdef = 1;
894 if (*p == '@') {
895 start_at = memparse(p+1, &p);
896 e820_add_region(start_at, mem_size, E820_RAM);
897 } else if (*p == '#') {
898 start_at = memparse(p+1, &p);
899 e820_add_region(start_at, mem_size, E820_ACPI);
900 } else if (*p == '$') {
901 start_at = memparse(p+1, &p);
902 e820_add_region(start_at, mem_size, E820_RESERVED);
903 } else
904 e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
905
906 return *p == '\0' ? 0 : -EINVAL;
907}
908early_param("memmap", parse_memmap_opt);
909
910void __init finish_e820_parsing(void)
911{
912 if (userdef) {
913 u32 nr = e820.nr_map;
914
915 if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0)
916 early_panic("Invalid user supplied memory map");
917 e820.nr_map = nr;
918
919 printk(KERN_INFO "user-defined physical RAM map:\n");
920 e820_print_map("user");
921 }
922}
923
924static inline const char *e820_type_to_string(int e820_type)
925{
926 switch (e820_type) {
927 case E820_RESERVED_KERN:
928 case E820_RAM: return "System RAM";
929 case E820_ACPI: return "ACPI Tables";
930 case E820_NVS: return "ACPI Non-volatile Storage";
931 case E820_UNUSABLE: return "Unusable memory";
932 default: return "reserved";
933 }
934}
935
936/*
937 * Mark e820 reserved areas as busy for the resource manager.
938 */
939static struct resource __initdata *e820_res;
940void __init e820_reserve_resources(void)
941{
942 int i;
943 struct resource *res;
944 u64 end;
945
946 res = alloc_bootmem(sizeof(struct resource) * e820.nr_map);
947 e820_res = res;
948 for (i = 0; i < e820.nr_map; i++) {
949 end = e820.map[i].addr + e820.map[i].size - 1;
950 if (end != (resource_size_t)end) {
951 res++;
952 continue;
953 }
954 res->name = e820_type_to_string(e820.map[i].type);
955 res->start = e820.map[i].addr;
956 res->end = end;
957
958 res->flags = IORESOURCE_MEM;
959
960 /*
961 * don't register the region that could be conflicted with
962 * pci device BAR resource and insert them later in
963 * pcibios_resource_survey()
964 */
965 if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20)) {
966 res->flags |= IORESOURCE_BUSY;
967 insert_resource(&iomem_resource, res);
968 }
969 res++;
970 }
971
972 for (i = 0; i < e820_saved.nr_map; i++) {
973 struct e820entry *entry = &e820_saved.map[i];
974 firmware_map_add_early(entry->addr,
975 entry->addr + entry->size - 1,
976 e820_type_to_string(entry->type));
977 }
978}
979
980/* How much should we pad RAM ending depending on where it is? */
981static unsigned long ram_alignment(resource_size_t pos)
982{
983 unsigned long mb = pos >> 20;
984
985 /* To 64kB in the first megabyte */
986 if (!mb)
987 return 64*1024;
988
989 /* To 1MB in the first 16MB */
990 if (mb < 16)
991 return 1024*1024;
992
993 /* To 64MB for anything above that */
994 return 64*1024*1024;
995}
996
997#define MAX_RESOURCE_SIZE ((resource_size_t)-1)
998
999void __init e820_reserve_resources_late(void)
1000{
1001 int i;
1002 struct resource *res;
1003
1004 res = e820_res;
1005 for (i = 0; i < e820.nr_map; i++) {
1006 if (!res->parent && res->end)
1007 insert_resource_expand_to_fit(&iomem_resource, res);
1008 res++;
1009 }
1010
1011 /*
1012 * Try to bump up RAM regions to reasonable boundaries to
1013 * avoid stolen RAM:
1014 */
1015 for (i = 0; i < e820.nr_map; i++) {
1016 struct e820entry *entry = &e820.map[i];
1017 u64 start, end;
1018
1019 if (entry->type != E820_RAM)
1020 continue;
1021 start = entry->addr + entry->size;
1022 end = round_up(start, ram_alignment(start)) - 1;
1023 if (end > MAX_RESOURCE_SIZE)
1024 end = MAX_RESOURCE_SIZE;
1025 if (start >= end)
1026 continue;
1027 printk(KERN_DEBUG "reserve RAM buffer: %016llx - %016llx ",
1028 start, end);
1029 reserve_region_with_split(&iomem_resource, start, end,
1030 "RAM buffer");
1031 }
1032}
1033
1034char *__init default_machine_specific_memory_setup(void)
1035{
1036 char *who = "BIOS-e820";
1037 u32 new_nr;
1038 /*
1039 * Try to copy the BIOS-supplied E820-map.
1040 *
1041 * Otherwise fake a memory map; one section from 0k->640k,
1042 * the next section from 1mb->appropriate_mem_k
1043 */
1044 new_nr = boot_params.e820_entries;
1045 sanitize_e820_map(boot_params.e820_map,
1046 ARRAY_SIZE(boot_params.e820_map),
1047 &new_nr);
1048 boot_params.e820_entries = new_nr;
1049 if (append_e820_map(boot_params.e820_map, boot_params.e820_entries)
1050 < 0) {
1051 u64 mem_size;
1052
1053 /* compare results from other methods and take the greater */
1054 if (boot_params.alt_mem_k
1055 < boot_params.screen_info.ext_mem_k) {
1056 mem_size = boot_params.screen_info.ext_mem_k;
1057 who = "BIOS-88";
1058 } else {
1059 mem_size = boot_params.alt_mem_k;
1060 who = "BIOS-e801";
1061 }
1062
1063 e820.nr_map = 0;
1064 e820_add_region(0, LOWMEMSIZE(), E820_RAM);
1065 e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
1066 }
1067
1068 /* In case someone cares... */
1069 return who;
1070}
1071
1072void __init setup_memory_map(void)
1073{
1074 char *who;
1075
1076 who = x86_init.resources.memory_setup();
1077 memcpy(&e820_saved, &e820, sizeof(struct e820map));
1078 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
1079 e820_print_map(who);
1080}
1081
1082void __init memblock_x86_fill(void)
1083{
1084 int i;
1085 u64 end;
1086
1087 /*
1088 * EFI may have more than 128 entries
1089 * We are safe to enable resizing, beause memblock_x86_fill()
1090 * is rather later for x86
1091 */
1092 memblock_can_resize = 1;
1093
1094 for (i = 0; i < e820.nr_map; i++) {
1095 struct e820entry *ei = &e820.map[i];
1096
1097 end = ei->addr + ei->size;
1098 if (end != (resource_size_t)end)
1099 continue;
1100
1101 if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
1102 continue;
1103
1104 memblock_add(ei->addr, ei->size);
1105 }
1106
1107 memblock_analyze();
1108 memblock_dump_all();
1109}
1110
1111void __init memblock_find_dma_reserve(void)
1112{
1113#ifdef CONFIG_X86_64
1114 u64 free_size_pfn;
1115 u64 mem_size_pfn;
1116 /*
1117 * need to find out used area below MAX_DMA_PFN
1118 * need to use memblock to get free size in [0, MAX_DMA_PFN]
1119 * at first, and assume boot_mem will not take below MAX_DMA_PFN
1120 */
1121 mem_size_pfn = memblock_x86_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
1122 free_size_pfn = memblock_x86_free_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
1123 set_dma_reserve(mem_size_pfn - free_size_pfn);
1124#endif
1125}
1/*
2 * Handle the memory map.
3 * The functions here do the job until bootmem takes over.
4 *
5 * Getting sanitize_e820_map() in sync with i386 version by applying change:
6 * - Provisions for empty E820 memory regions (reported by certain BIOSes).
7 * Alex Achenbach <xela@slit.de>, December 2002.
8 * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
9 *
10 */
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/init.h>
14#include <linux/crash_dump.h>
15#include <linux/export.h>
16#include <linux/bootmem.h>
17#include <linux/pfn.h>
18#include <linux/suspend.h>
19#include <linux/acpi.h>
20#include <linux/firmware-map.h>
21#include <linux/memblock.h>
22#include <linux/sort.h>
23
24#include <asm/e820.h>
25#include <asm/proto.h>
26#include <asm/setup.h>
27#include <asm/cpufeature.h>
28
29/*
30 * The e820 map is the map that gets modified e.g. with command line parameters
31 * and that is also registered with modifications in the kernel resource tree
32 * with the iomem_resource as parent.
33 *
34 * The e820_saved is directly saved after the BIOS-provided memory map is
35 * copied. It doesn't get modified afterwards. It's registered for the
36 * /sys/firmware/memmap interface.
37 *
38 * That memory map is not modified and is used as base for kexec. The kexec'd
39 * kernel should get the same memory map as the firmware provides. Then the
40 * user can e.g. boot the original kernel with mem=1G while still booting the
41 * next kernel with full memory.
42 */
43static struct e820map initial_e820 __initdata;
44static struct e820map initial_e820_saved __initdata;
45struct e820map *e820 __refdata = &initial_e820;
46struct e820map *e820_saved __refdata = &initial_e820_saved;
47
48/* For PCI or other memory-mapped resources */
49unsigned long pci_mem_start = 0xaeedbabe;
50#ifdef CONFIG_PCI
51EXPORT_SYMBOL(pci_mem_start);
52#endif
53
54/*
55 * This function checks if any part of the range <start,end> is mapped
56 * with type.
57 */
58int
59e820_any_mapped(u64 start, u64 end, unsigned type)
60{
61 int i;
62
63 for (i = 0; i < e820->nr_map; i++) {
64 struct e820entry *ei = &e820->map[i];
65
66 if (type && ei->type != type)
67 continue;
68 if (ei->addr >= end || ei->addr + ei->size <= start)
69 continue;
70 return 1;
71 }
72 return 0;
73}
74EXPORT_SYMBOL_GPL(e820_any_mapped);
75
76/*
77 * This function checks if the entire range <start,end> is mapped with type.
78 *
79 * Note: this function only works correct if the e820 table is sorted and
80 * not-overlapping, which is the case
81 */
82int __init e820_all_mapped(u64 start, u64 end, unsigned type)
83{
84 int i;
85
86 for (i = 0; i < e820->nr_map; i++) {
87 struct e820entry *ei = &e820->map[i];
88
89 if (type && ei->type != type)
90 continue;
91 /* is the region (part) in overlap with the current region ?*/
92 if (ei->addr >= end || ei->addr + ei->size <= start)
93 continue;
94
95 /* if the region is at the beginning of <start,end> we move
96 * start to the end of the region since it's ok until there
97 */
98 if (ei->addr <= start)
99 start = ei->addr + ei->size;
100 /*
101 * if start is now at or beyond end, we're done, full
102 * coverage
103 */
104 if (start >= end)
105 return 1;
106 }
107 return 0;
108}
109
110/*
111 * Add a memory region to the kernel e820 map.
112 */
113static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size,
114 int type)
115{
116 int x = e820x->nr_map;
117
118 if (x >= ARRAY_SIZE(e820x->map)) {
119 printk(KERN_ERR "e820: too many entries; ignoring [mem %#010llx-%#010llx]\n",
120 (unsigned long long) start,
121 (unsigned long long) (start + size - 1));
122 return;
123 }
124
125 e820x->map[x].addr = start;
126 e820x->map[x].size = size;
127 e820x->map[x].type = type;
128 e820x->nr_map++;
129}
130
131void __init e820_add_region(u64 start, u64 size, int type)
132{
133 __e820_add_region(e820, start, size, type);
134}
135
136static void __init e820_print_type(u32 type)
137{
138 switch (type) {
139 case E820_RAM:
140 case E820_RESERVED_KERN:
141 printk(KERN_CONT "usable");
142 break;
143 case E820_RESERVED:
144 printk(KERN_CONT "reserved");
145 break;
146 case E820_ACPI:
147 printk(KERN_CONT "ACPI data");
148 break;
149 case E820_NVS:
150 printk(KERN_CONT "ACPI NVS");
151 break;
152 case E820_UNUSABLE:
153 printk(KERN_CONT "unusable");
154 break;
155 case E820_PMEM:
156 case E820_PRAM:
157 printk(KERN_CONT "persistent (type %u)", type);
158 break;
159 default:
160 printk(KERN_CONT "type %u", type);
161 break;
162 }
163}
164
165void __init e820_print_map(char *who)
166{
167 int i;
168
169 for (i = 0; i < e820->nr_map; i++) {
170 printk(KERN_INFO "%s: [mem %#018Lx-%#018Lx] ", who,
171 (unsigned long long) e820->map[i].addr,
172 (unsigned long long)
173 (e820->map[i].addr + e820->map[i].size - 1));
174 e820_print_type(e820->map[i].type);
175 printk(KERN_CONT "\n");
176 }
177}
178
179/*
180 * Sanitize the BIOS e820 map.
181 *
182 * Some e820 responses include overlapping entries. The following
183 * replaces the original e820 map with a new one, removing overlaps,
184 * and resolving conflicting memory types in favor of highest
185 * numbered type.
186 *
187 * The input parameter biosmap points to an array of 'struct
188 * e820entry' which on entry has elements in the range [0, *pnr_map)
189 * valid, and which has space for up to max_nr_map entries.
190 * On return, the resulting sanitized e820 map entries will be in
191 * overwritten in the same location, starting at biosmap.
192 *
193 * The integer pointed to by pnr_map must be valid on entry (the
194 * current number of valid entries located at biosmap). If the
195 * sanitizing succeeds the *pnr_map will be updated with the new
196 * number of valid entries (something no more than max_nr_map).
197 *
198 * The return value from sanitize_e820_map() is zero if it
199 * successfully 'sanitized' the map entries passed in, and is -1
200 * if it did nothing, which can happen if either of (1) it was
201 * only passed one map entry, or (2) any of the input map entries
202 * were invalid (start + size < start, meaning that the size was
203 * so big the described memory range wrapped around through zero.)
204 *
205 * Visually we're performing the following
206 * (1,2,3,4 = memory types)...
207 *
208 * Sample memory map (w/overlaps):
209 * ____22__________________
210 * ______________________4_
211 * ____1111________________
212 * _44_____________________
213 * 11111111________________
214 * ____________________33__
215 * ___________44___________
216 * __________33333_________
217 * ______________22________
218 * ___________________2222_
219 * _________111111111______
220 * _____________________11_
221 * _________________4______
222 *
223 * Sanitized equivalent (no overlap):
224 * 1_______________________
225 * _44_____________________
226 * ___1____________________
227 * ____22__________________
228 * ______11________________
229 * _________1______________
230 * __________3_____________
231 * ___________44___________
232 * _____________33_________
233 * _______________2________
234 * ________________1_______
235 * _________________4______
236 * ___________________2____
237 * ____________________33__
238 * ______________________4_
239 */
240struct change_member {
241 struct e820entry *pbios; /* pointer to original bios entry */
242 unsigned long long addr; /* address for this change point */
243};
244
245static int __init cpcompare(const void *a, const void *b)
246{
247 struct change_member * const *app = a, * const *bpp = b;
248 const struct change_member *ap = *app, *bp = *bpp;
249
250 /*
251 * Inputs are pointers to two elements of change_point[]. If their
252 * addresses are unequal, their difference dominates. If the addresses
253 * are equal, then consider one that represents the end of its region
254 * to be greater than one that does not.
255 */
256 if (ap->addr != bp->addr)
257 return ap->addr > bp->addr ? 1 : -1;
258
259 return (ap->addr != ap->pbios->addr) - (bp->addr != bp->pbios->addr);
260}
261
262int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
263 u32 *pnr_map)
264{
265 static struct change_member change_point_list[2*E820_X_MAX] __initdata;
266 static struct change_member *change_point[2*E820_X_MAX] __initdata;
267 static struct e820entry *overlap_list[E820_X_MAX] __initdata;
268 static struct e820entry new_bios[E820_X_MAX] __initdata;
269 unsigned long current_type, last_type;
270 unsigned long long last_addr;
271 int chgidx;
272 int overlap_entries;
273 int new_bios_entry;
274 int old_nr, new_nr, chg_nr;
275 int i;
276
277 /* if there's only one memory region, don't bother */
278 if (*pnr_map < 2)
279 return -1;
280
281 old_nr = *pnr_map;
282 BUG_ON(old_nr > max_nr_map);
283
284 /* bail out if we find any unreasonable addresses in bios map */
285 for (i = 0; i < old_nr; i++)
286 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
287 return -1;
288
289 /* create pointers for initial change-point information (for sorting) */
290 for (i = 0; i < 2 * old_nr; i++)
291 change_point[i] = &change_point_list[i];
292
293 /* record all known change-points (starting and ending addresses),
294 omitting those that are for empty memory regions */
295 chgidx = 0;
296 for (i = 0; i < old_nr; i++) {
297 if (biosmap[i].size != 0) {
298 change_point[chgidx]->addr = biosmap[i].addr;
299 change_point[chgidx++]->pbios = &biosmap[i];
300 change_point[chgidx]->addr = biosmap[i].addr +
301 biosmap[i].size;
302 change_point[chgidx++]->pbios = &biosmap[i];
303 }
304 }
305 chg_nr = chgidx;
306
307 /* sort change-point list by memory addresses (low -> high) */
308 sort(change_point, chg_nr, sizeof *change_point, cpcompare, NULL);
309
310 /* create a new bios memory map, removing overlaps */
311 overlap_entries = 0; /* number of entries in the overlap table */
312 new_bios_entry = 0; /* index for creating new bios map entries */
313 last_type = 0; /* start with undefined memory type */
314 last_addr = 0; /* start with 0 as last starting address */
315
316 /* loop through change-points, determining affect on the new bios map */
317 for (chgidx = 0; chgidx < chg_nr; chgidx++) {
318 /* keep track of all overlapping bios entries */
319 if (change_point[chgidx]->addr ==
320 change_point[chgidx]->pbios->addr) {
321 /*
322 * add map entry to overlap list (> 1 entry
323 * implies an overlap)
324 */
325 overlap_list[overlap_entries++] =
326 change_point[chgidx]->pbios;
327 } else {
328 /*
329 * remove entry from list (order independent,
330 * so swap with last)
331 */
332 for (i = 0; i < overlap_entries; i++) {
333 if (overlap_list[i] ==
334 change_point[chgidx]->pbios)
335 overlap_list[i] =
336 overlap_list[overlap_entries-1];
337 }
338 overlap_entries--;
339 }
340 /*
341 * if there are overlapping entries, decide which
342 * "type" to use (larger value takes precedence --
343 * 1=usable, 2,3,4,4+=unusable)
344 */
345 current_type = 0;
346 for (i = 0; i < overlap_entries; i++)
347 if (overlap_list[i]->type > current_type)
348 current_type = overlap_list[i]->type;
349 /*
350 * continue building up new bios map based on this
351 * information
352 */
353 if (current_type != last_type || current_type == E820_PRAM) {
354 if (last_type != 0) {
355 new_bios[new_bios_entry].size =
356 change_point[chgidx]->addr - last_addr;
357 /*
358 * move forward only if the new size
359 * was non-zero
360 */
361 if (new_bios[new_bios_entry].size != 0)
362 /*
363 * no more space left for new
364 * bios entries ?
365 */
366 if (++new_bios_entry >= max_nr_map)
367 break;
368 }
369 if (current_type != 0) {
370 new_bios[new_bios_entry].addr =
371 change_point[chgidx]->addr;
372 new_bios[new_bios_entry].type = current_type;
373 last_addr = change_point[chgidx]->addr;
374 }
375 last_type = current_type;
376 }
377 }
378 /* retain count for new bios entries */
379 new_nr = new_bios_entry;
380
381 /* copy new bios mapping into original location */
382 memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry));
383 *pnr_map = new_nr;
384
385 return 0;
386}
387
388static int __init __append_e820_map(struct e820entry *biosmap, int nr_map)
389{
390 while (nr_map) {
391 u64 start = biosmap->addr;
392 u64 size = biosmap->size;
393 u64 end = start + size - 1;
394 u32 type = biosmap->type;
395
396 /* Overflow in 64 bits? Ignore the memory map. */
397 if (start > end && likely(size))
398 return -1;
399
400 e820_add_region(start, size, type);
401
402 biosmap++;
403 nr_map--;
404 }
405 return 0;
406}
407
408/*
409 * Copy the BIOS e820 map into a safe place.
410 *
411 * Sanity-check it while we're at it..
412 *
413 * If we're lucky and live on a modern system, the setup code
414 * will have given us a memory map that we can use to properly
415 * set up memory. If we aren't, we'll fake a memory map.
416 */
417static int __init append_e820_map(struct e820entry *biosmap, int nr_map)
418{
419 /* Only one memory region (or negative)? Ignore it */
420 if (nr_map < 2)
421 return -1;
422
423 return __append_e820_map(biosmap, nr_map);
424}
425
426static u64 __init __e820_update_range(struct e820map *e820x, u64 start,
427 u64 size, unsigned old_type,
428 unsigned new_type)
429{
430 u64 end;
431 unsigned int i;
432 u64 real_updated_size = 0;
433
434 BUG_ON(old_type == new_type);
435
436 if (size > (ULLONG_MAX - start))
437 size = ULLONG_MAX - start;
438
439 end = start + size;
440 printk(KERN_DEBUG "e820: update [mem %#010Lx-%#010Lx] ",
441 (unsigned long long) start, (unsigned long long) (end - 1));
442 e820_print_type(old_type);
443 printk(KERN_CONT " ==> ");
444 e820_print_type(new_type);
445 printk(KERN_CONT "\n");
446
447 for (i = 0; i < e820x->nr_map; i++) {
448 struct e820entry *ei = &e820x->map[i];
449 u64 final_start, final_end;
450 u64 ei_end;
451
452 if (ei->type != old_type)
453 continue;
454
455 ei_end = ei->addr + ei->size;
456 /* totally covered by new range? */
457 if (ei->addr >= start && ei_end <= end) {
458 ei->type = new_type;
459 real_updated_size += ei->size;
460 continue;
461 }
462
463 /* new range is totally covered? */
464 if (ei->addr < start && ei_end > end) {
465 __e820_add_region(e820x, start, size, new_type);
466 __e820_add_region(e820x, end, ei_end - end, ei->type);
467 ei->size = start - ei->addr;
468 real_updated_size += size;
469 continue;
470 }
471
472 /* partially covered */
473 final_start = max(start, ei->addr);
474 final_end = min(end, ei_end);
475 if (final_start >= final_end)
476 continue;
477
478 __e820_add_region(e820x, final_start, final_end - final_start,
479 new_type);
480
481 real_updated_size += final_end - final_start;
482
483 /*
484 * left range could be head or tail, so need to update
485 * size at first.
486 */
487 ei->size -= final_end - final_start;
488 if (ei->addr < final_start)
489 continue;
490 ei->addr = final_end;
491 }
492 return real_updated_size;
493}
494
495u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
496 unsigned new_type)
497{
498 return __e820_update_range(e820, start, size, old_type, new_type);
499}
500
501static u64 __init e820_update_range_saved(u64 start, u64 size,
502 unsigned old_type, unsigned new_type)
503{
504 return __e820_update_range(e820_saved, start, size, old_type,
505 new_type);
506}
507
508/* make e820 not cover the range */
509u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type,
510 int checktype)
511{
512 int i;
513 u64 end;
514 u64 real_removed_size = 0;
515
516 if (size > (ULLONG_MAX - start))
517 size = ULLONG_MAX - start;
518
519 end = start + size;
520 printk(KERN_DEBUG "e820: remove [mem %#010Lx-%#010Lx] ",
521 (unsigned long long) start, (unsigned long long) (end - 1));
522 if (checktype)
523 e820_print_type(old_type);
524 printk(KERN_CONT "\n");
525
526 for (i = 0; i < e820->nr_map; i++) {
527 struct e820entry *ei = &e820->map[i];
528 u64 final_start, final_end;
529 u64 ei_end;
530
531 if (checktype && ei->type != old_type)
532 continue;
533
534 ei_end = ei->addr + ei->size;
535 /* totally covered? */
536 if (ei->addr >= start && ei_end <= end) {
537 real_removed_size += ei->size;
538 memset(ei, 0, sizeof(struct e820entry));
539 continue;
540 }
541
542 /* new range is totally covered? */
543 if (ei->addr < start && ei_end > end) {
544 e820_add_region(end, ei_end - end, ei->type);
545 ei->size = start - ei->addr;
546 real_removed_size += size;
547 continue;
548 }
549
550 /* partially covered */
551 final_start = max(start, ei->addr);
552 final_end = min(end, ei_end);
553 if (final_start >= final_end)
554 continue;
555 real_removed_size += final_end - final_start;
556
557 /*
558 * left range could be head or tail, so need to update
559 * size at first.
560 */
561 ei->size -= final_end - final_start;
562 if (ei->addr < final_start)
563 continue;
564 ei->addr = final_end;
565 }
566 return real_removed_size;
567}
568
569void __init update_e820(void)
570{
571 if (sanitize_e820_map(e820->map, ARRAY_SIZE(e820->map), &e820->nr_map))
572 return;
573 printk(KERN_INFO "e820: modified physical RAM map:\n");
574 e820_print_map("modified");
575}
576static void __init update_e820_saved(void)
577{
578 sanitize_e820_map(e820_saved->map, ARRAY_SIZE(e820_saved->map),
579 &e820_saved->nr_map);
580}
581#define MAX_GAP_END 0x100000000ull
582/*
583 * Search for a gap in the e820 memory space from start_addr to end_addr.
584 */
585__init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
586 unsigned long start_addr, unsigned long long end_addr)
587{
588 unsigned long long last;
589 int i = e820->nr_map;
590 int found = 0;
591
592 last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END;
593
594 while (--i >= 0) {
595 unsigned long long start = e820->map[i].addr;
596 unsigned long long end = start + e820->map[i].size;
597
598 if (end < start_addr)
599 continue;
600
601 /*
602 * Since "last" is at most 4GB, we know we'll
603 * fit in 32 bits if this condition is true
604 */
605 if (last > end) {
606 unsigned long gap = last - end;
607
608 if (gap >= *gapsize) {
609 *gapsize = gap;
610 *gapstart = end;
611 found = 1;
612 }
613 }
614 if (start < last)
615 last = start;
616 }
617 return found;
618}
619
620/*
621 * Search for the biggest gap in the low 32 bits of the e820
622 * memory space. We pass this space to PCI to assign MMIO resources
623 * for hotplug or unconfigured devices in.
624 * Hopefully the BIOS let enough space left.
625 */
626__init void e820_setup_gap(void)
627{
628 unsigned long gapstart, gapsize;
629 int found;
630
631 gapstart = 0x10000000;
632 gapsize = 0x400000;
633 found = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END);
634
635#ifdef CONFIG_X86_64
636 if (!found) {
637 gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024;
638 printk(KERN_ERR
639 "e820: cannot find a gap in the 32bit address range\n"
640 "e820: PCI devices with unassigned 32bit BARs may break!\n");
641 }
642#endif
643
644 /*
645 * e820_reserve_resources_late protect stolen RAM already
646 */
647 pci_mem_start = gapstart;
648
649 printk(KERN_INFO
650 "e820: [mem %#010lx-%#010lx] available for PCI devices\n",
651 gapstart, gapstart + gapsize - 1);
652}
653
654/*
655 * Called late during init, in free_initmem().
656 *
657 * Initial e820 and e820_saved are largish __initdata arrays.
658 * Copy them to (usually much smaller) dynamically allocated area.
659 * This is done after all tweaks we ever do to them:
660 * all functions which modify them are __init functions,
661 * they won't exist after this point.
662 */
663__init void e820_reallocate_tables(void)
664{
665 struct e820map *n;
666 int size;
667
668 size = offsetof(struct e820map, map) + sizeof(struct e820entry) * e820->nr_map;
669 n = kmalloc(size, GFP_KERNEL);
670 BUG_ON(!n);
671 memcpy(n, e820, size);
672 e820 = n;
673
674 size = offsetof(struct e820map, map) + sizeof(struct e820entry) * e820_saved->nr_map;
675 n = kmalloc(size, GFP_KERNEL);
676 BUG_ON(!n);
677 memcpy(n, e820_saved, size);
678 e820_saved = n;
679}
680
681/**
682 * Because of the size limitation of struct boot_params, only first
683 * 128 E820 memory entries are passed to kernel via
684 * boot_params.e820_map, others are passed via SETUP_E820_EXT node of
685 * linked list of struct setup_data, which is parsed here.
686 */
687void __init parse_e820_ext(u64 phys_addr, u32 data_len)
688{
689 int entries;
690 struct e820entry *extmap;
691 struct setup_data *sdata;
692
693 sdata = early_memremap(phys_addr, data_len);
694 entries = sdata->len / sizeof(struct e820entry);
695 extmap = (struct e820entry *)(sdata->data);
696 __append_e820_map(extmap, entries);
697 sanitize_e820_map(e820->map, ARRAY_SIZE(e820->map), &e820->nr_map);
698 early_memunmap(sdata, data_len);
699 printk(KERN_INFO "e820: extended physical RAM map:\n");
700 e820_print_map("extended");
701}
702
703#if defined(CONFIG_X86_64) || \
704 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
705/**
706 * Find the ranges of physical addresses that do not correspond to
707 * e820 RAM areas and mark the corresponding pages as nosave for
708 * hibernation (32 bit) or software suspend and suspend to RAM (64 bit).
709 *
710 * This function requires the e820 map to be sorted and without any
711 * overlapping entries.
712 */
713void __init e820_mark_nosave_regions(unsigned long limit_pfn)
714{
715 int i;
716 unsigned long pfn = 0;
717
718 for (i = 0; i < e820->nr_map; i++) {
719 struct e820entry *ei = &e820->map[i];
720
721 if (pfn < PFN_UP(ei->addr))
722 register_nosave_region(pfn, PFN_UP(ei->addr));
723
724 pfn = PFN_DOWN(ei->addr + ei->size);
725
726 if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
727 register_nosave_region(PFN_UP(ei->addr), pfn);
728
729 if (pfn >= limit_pfn)
730 break;
731 }
732}
733#endif
734
735#ifdef CONFIG_ACPI
736/**
737 * Mark ACPI NVS memory region, so that we can save/restore it during
738 * hibernation and the subsequent resume.
739 */
740static int __init e820_mark_nvs_memory(void)
741{
742 int i;
743
744 for (i = 0; i < e820->nr_map; i++) {
745 struct e820entry *ei = &e820->map[i];
746
747 if (ei->type == E820_NVS)
748 acpi_nvs_register(ei->addr, ei->size);
749 }
750
751 return 0;
752}
753core_initcall(e820_mark_nvs_memory);
754#endif
755
756/*
757 * pre allocated 4k and reserved it in memblock and e820_saved
758 */
759u64 __init early_reserve_e820(u64 size, u64 align)
760{
761 u64 addr;
762
763 addr = __memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
764 if (addr) {
765 e820_update_range_saved(addr, size, E820_RAM, E820_RESERVED);
766 printk(KERN_INFO "e820: update e820_saved for early_reserve_e820\n");
767 update_e820_saved();
768 }
769
770 return addr;
771}
772
773#ifdef CONFIG_X86_32
774# ifdef CONFIG_X86_PAE
775# define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT))
776# else
777# define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT))
778# endif
779#else /* CONFIG_X86_32 */
780# define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT
781#endif
782
783/*
784 * Find the highest page frame number we have available
785 */
786static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
787{
788 int i;
789 unsigned long last_pfn = 0;
790 unsigned long max_arch_pfn = MAX_ARCH_PFN;
791
792 for (i = 0; i < e820->nr_map; i++) {
793 struct e820entry *ei = &e820->map[i];
794 unsigned long start_pfn;
795 unsigned long end_pfn;
796
797 if (ei->type != type)
798 continue;
799
800 start_pfn = ei->addr >> PAGE_SHIFT;
801 end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT;
802
803 if (start_pfn >= limit_pfn)
804 continue;
805 if (end_pfn > limit_pfn) {
806 last_pfn = limit_pfn;
807 break;
808 }
809 if (end_pfn > last_pfn)
810 last_pfn = end_pfn;
811 }
812
813 if (last_pfn > max_arch_pfn)
814 last_pfn = max_arch_pfn;
815
816 printk(KERN_INFO "e820: last_pfn = %#lx max_arch_pfn = %#lx\n",
817 last_pfn, max_arch_pfn);
818 return last_pfn;
819}
820unsigned long __init e820_end_of_ram_pfn(void)
821{
822 return e820_end_pfn(MAX_ARCH_PFN, E820_RAM);
823}
824
825unsigned long __init e820_end_of_low_ram_pfn(void)
826{
827 return e820_end_pfn(1UL << (32 - PAGE_SHIFT), E820_RAM);
828}
829
830static void __init early_panic(char *msg)
831{
832 early_printk(msg);
833 panic(msg);
834}
835
836static int userdef __initdata;
837
838/* "mem=nopentium" disables the 4MB page tables. */
839static int __init parse_memopt(char *p)
840{
841 u64 mem_size;
842
843 if (!p)
844 return -EINVAL;
845
846 if (!strcmp(p, "nopentium")) {
847#ifdef CONFIG_X86_32
848 setup_clear_cpu_cap(X86_FEATURE_PSE);
849 return 0;
850#else
851 printk(KERN_WARNING "mem=nopentium ignored! (only supported on x86_32)\n");
852 return -EINVAL;
853#endif
854 }
855
856 userdef = 1;
857 mem_size = memparse(p, &p);
858 /* don't remove all of memory when handling "mem={invalid}" param */
859 if (mem_size == 0)
860 return -EINVAL;
861 e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
862
863 return 0;
864}
865early_param("mem", parse_memopt);
866
867static int __init parse_memmap_one(char *p)
868{
869 char *oldp;
870 u64 start_at, mem_size;
871
872 if (!p)
873 return -EINVAL;
874
875 if (!strncmp(p, "exactmap", 8)) {
876#ifdef CONFIG_CRASH_DUMP
877 /*
878 * If we are doing a crash dump, we still need to know
879 * the real mem size before original memory map is
880 * reset.
881 */
882 saved_max_pfn = e820_end_of_ram_pfn();
883#endif
884 e820->nr_map = 0;
885 userdef = 1;
886 return 0;
887 }
888
889 oldp = p;
890 mem_size = memparse(p, &p);
891 if (p == oldp)
892 return -EINVAL;
893
894 userdef = 1;
895 if (*p == '@') {
896 start_at = memparse(p+1, &p);
897 e820_add_region(start_at, mem_size, E820_RAM);
898 } else if (*p == '#') {
899 start_at = memparse(p+1, &p);
900 e820_add_region(start_at, mem_size, E820_ACPI);
901 } else if (*p == '$') {
902 start_at = memparse(p+1, &p);
903 e820_add_region(start_at, mem_size, E820_RESERVED);
904 } else if (*p == '!') {
905 start_at = memparse(p+1, &p);
906 e820_add_region(start_at, mem_size, E820_PRAM);
907 } else
908 e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
909
910 return *p == '\0' ? 0 : -EINVAL;
911}
912static int __init parse_memmap_opt(char *str)
913{
914 while (str) {
915 char *k = strchr(str, ',');
916
917 if (k)
918 *k++ = 0;
919
920 parse_memmap_one(str);
921 str = k;
922 }
923
924 return 0;
925}
926early_param("memmap", parse_memmap_opt);
927
928void __init finish_e820_parsing(void)
929{
930 if (userdef) {
931 if (sanitize_e820_map(e820->map, ARRAY_SIZE(e820->map),
932 &e820->nr_map) < 0)
933 early_panic("Invalid user supplied memory map");
934
935 printk(KERN_INFO "e820: user-defined physical RAM map:\n");
936 e820_print_map("user");
937 }
938}
939
940static const char *__init e820_type_to_string(int e820_type)
941{
942 switch (e820_type) {
943 case E820_RESERVED_KERN:
944 case E820_RAM: return "System RAM";
945 case E820_ACPI: return "ACPI Tables";
946 case E820_NVS: return "ACPI Non-volatile Storage";
947 case E820_UNUSABLE: return "Unusable memory";
948 case E820_PRAM: return "Persistent Memory (legacy)";
949 case E820_PMEM: return "Persistent Memory";
950 default: return "reserved";
951 }
952}
953
954static unsigned long __init e820_type_to_iomem_type(int e820_type)
955{
956 switch (e820_type) {
957 case E820_RESERVED_KERN:
958 case E820_RAM:
959 return IORESOURCE_SYSTEM_RAM;
960 case E820_ACPI:
961 case E820_NVS:
962 case E820_UNUSABLE:
963 case E820_PRAM:
964 case E820_PMEM:
965 default:
966 return IORESOURCE_MEM;
967 }
968}
969
970static unsigned long __init e820_type_to_iores_desc(int e820_type)
971{
972 switch (e820_type) {
973 case E820_ACPI:
974 return IORES_DESC_ACPI_TABLES;
975 case E820_NVS:
976 return IORES_DESC_ACPI_NV_STORAGE;
977 case E820_PMEM:
978 return IORES_DESC_PERSISTENT_MEMORY;
979 case E820_PRAM:
980 return IORES_DESC_PERSISTENT_MEMORY_LEGACY;
981 case E820_RESERVED_KERN:
982 case E820_RAM:
983 case E820_UNUSABLE:
984 default:
985 return IORES_DESC_NONE;
986 }
987}
988
989static bool __init do_mark_busy(u32 type, struct resource *res)
990{
991 /* this is the legacy bios/dos rom-shadow + mmio region */
992 if (res->start < (1ULL<<20))
993 return true;
994
995 /*
996 * Treat persistent memory like device memory, i.e. reserve it
997 * for exclusive use of a driver
998 */
999 switch (type) {
1000 case E820_RESERVED:
1001 case E820_PRAM:
1002 case E820_PMEM:
1003 return false;
1004 default:
1005 return true;
1006 }
1007}
1008
1009/*
1010 * Mark e820 reserved areas as busy for the resource manager.
1011 */
1012static struct resource __initdata *e820_res;
1013void __init e820_reserve_resources(void)
1014{
1015 int i;
1016 struct resource *res;
1017 u64 end;
1018
1019 res = alloc_bootmem(sizeof(struct resource) * e820->nr_map);
1020 e820_res = res;
1021 for (i = 0; i < e820->nr_map; i++) {
1022 end = e820->map[i].addr + e820->map[i].size - 1;
1023 if (end != (resource_size_t)end) {
1024 res++;
1025 continue;
1026 }
1027 res->name = e820_type_to_string(e820->map[i].type);
1028 res->start = e820->map[i].addr;
1029 res->end = end;
1030
1031 res->flags = e820_type_to_iomem_type(e820->map[i].type);
1032 res->desc = e820_type_to_iores_desc(e820->map[i].type);
1033
1034 /*
1035 * don't register the region that could be conflicted with
1036 * pci device BAR resource and insert them later in
1037 * pcibios_resource_survey()
1038 */
1039 if (do_mark_busy(e820->map[i].type, res)) {
1040 res->flags |= IORESOURCE_BUSY;
1041 insert_resource(&iomem_resource, res);
1042 }
1043 res++;
1044 }
1045
1046 for (i = 0; i < e820_saved->nr_map; i++) {
1047 struct e820entry *entry = &e820_saved->map[i];
1048 firmware_map_add_early(entry->addr,
1049 entry->addr + entry->size,
1050 e820_type_to_string(entry->type));
1051 }
1052}
1053
1054/* How much should we pad RAM ending depending on where it is? */
1055static unsigned long __init ram_alignment(resource_size_t pos)
1056{
1057 unsigned long mb = pos >> 20;
1058
1059 /* To 64kB in the first megabyte */
1060 if (!mb)
1061 return 64*1024;
1062
1063 /* To 1MB in the first 16MB */
1064 if (mb < 16)
1065 return 1024*1024;
1066
1067 /* To 64MB for anything above that */
1068 return 64*1024*1024;
1069}
1070
1071#define MAX_RESOURCE_SIZE ((resource_size_t)-1)
1072
1073void __init e820_reserve_resources_late(void)
1074{
1075 int i;
1076 struct resource *res;
1077
1078 res = e820_res;
1079 for (i = 0; i < e820->nr_map; i++) {
1080 if (!res->parent && res->end)
1081 insert_resource_expand_to_fit(&iomem_resource, res);
1082 res++;
1083 }
1084
1085 /*
1086 * Try to bump up RAM regions to reasonable boundaries to
1087 * avoid stolen RAM:
1088 */
1089 for (i = 0; i < e820->nr_map; i++) {
1090 struct e820entry *entry = &e820->map[i];
1091 u64 start, end;
1092
1093 if (entry->type != E820_RAM)
1094 continue;
1095 start = entry->addr + entry->size;
1096 end = round_up(start, ram_alignment(start)) - 1;
1097 if (end > MAX_RESOURCE_SIZE)
1098 end = MAX_RESOURCE_SIZE;
1099 if (start >= end)
1100 continue;
1101 printk(KERN_DEBUG
1102 "e820: reserve RAM buffer [mem %#010llx-%#010llx]\n",
1103 start, end);
1104 reserve_region_with_split(&iomem_resource, start, end,
1105 "RAM buffer");
1106 }
1107}
1108
1109char *__init default_machine_specific_memory_setup(void)
1110{
1111 char *who = "BIOS-e820";
1112 u32 new_nr;
1113 /*
1114 * Try to copy the BIOS-supplied E820-map.
1115 *
1116 * Otherwise fake a memory map; one section from 0k->640k,
1117 * the next section from 1mb->appropriate_mem_k
1118 */
1119 new_nr = boot_params.e820_entries;
1120 sanitize_e820_map(boot_params.e820_map,
1121 ARRAY_SIZE(boot_params.e820_map),
1122 &new_nr);
1123 boot_params.e820_entries = new_nr;
1124 if (append_e820_map(boot_params.e820_map, boot_params.e820_entries)
1125 < 0) {
1126 u64 mem_size;
1127
1128 /* compare results from other methods and take the greater */
1129 if (boot_params.alt_mem_k
1130 < boot_params.screen_info.ext_mem_k) {
1131 mem_size = boot_params.screen_info.ext_mem_k;
1132 who = "BIOS-88";
1133 } else {
1134 mem_size = boot_params.alt_mem_k;
1135 who = "BIOS-e801";
1136 }
1137
1138 e820->nr_map = 0;
1139 e820_add_region(0, LOWMEMSIZE(), E820_RAM);
1140 e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
1141 }
1142
1143 /* In case someone cares... */
1144 return who;
1145}
1146
1147void __init setup_memory_map(void)
1148{
1149 char *who;
1150
1151 who = x86_init.resources.memory_setup();
1152 memcpy(e820_saved, e820, sizeof(struct e820map));
1153 printk(KERN_INFO "e820: BIOS-provided physical RAM map:\n");
1154 e820_print_map(who);
1155}
1156
1157void __init memblock_x86_fill(void)
1158{
1159 int i;
1160 u64 end;
1161
1162 /*
1163 * EFI may have more than 128 entries
1164 * We are safe to enable resizing, beause memblock_x86_fill()
1165 * is rather later for x86
1166 */
1167 memblock_allow_resize();
1168
1169 for (i = 0; i < e820->nr_map; i++) {
1170 struct e820entry *ei = &e820->map[i];
1171
1172 end = ei->addr + ei->size;
1173 if (end != (resource_size_t)end)
1174 continue;
1175
1176 if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
1177 continue;
1178
1179 memblock_add(ei->addr, ei->size);
1180 }
1181
1182 /* throw away partial pages */
1183 memblock_trim_memory(PAGE_SIZE);
1184
1185 memblock_dump_all();
1186}
1187
1188void __init memblock_find_dma_reserve(void)
1189{
1190#ifdef CONFIG_X86_64
1191 u64 nr_pages = 0, nr_free_pages = 0;
1192 unsigned long start_pfn, end_pfn;
1193 phys_addr_t start, end;
1194 int i;
1195 u64 u;
1196
1197 /*
1198 * need to find out used area below MAX_DMA_PFN
1199 * need to use memblock to get free size in [0, MAX_DMA_PFN]
1200 * at first, and assume boot_mem will not take below MAX_DMA_PFN
1201 */
1202 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
1203 start_pfn = min(start_pfn, MAX_DMA_PFN);
1204 end_pfn = min(end_pfn, MAX_DMA_PFN);
1205 nr_pages += end_pfn - start_pfn;
1206 }
1207
1208 for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
1209 NULL) {
1210 start_pfn = min_t(unsigned long, PFN_UP(start), MAX_DMA_PFN);
1211 end_pfn = min_t(unsigned long, PFN_DOWN(end), MAX_DMA_PFN);
1212 if (start_pfn < end_pfn)
1213 nr_free_pages += end_pfn - start_pfn;
1214 }
1215
1216 set_dma_reserve(nr_pages - nr_free_pages);
1217#endif
1218}