2
* Handle the memory map.
3
* The functions here do the job until bootmem takes over.
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>
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>
24
#include <asm/proto.h>
25
#include <asm/setup.h>
28
* The e820 map is the map that gets modified e.g. with command line parameters
29
* and that is also registered with modifications in the kernel resource tree
30
* with the iomem_resource as parent.
32
* The e820_saved is directly saved after the BIOS-provided memory map is
33
* copied. It doesn't get modified afterwards. It's registered for the
34
* /sys/firmware/memmap interface.
36
* That memory map is not modified and is used as base for kexec. The kexec'd
37
* kernel should get the same memory map as the firmware provides. Then the
38
* user can e.g. boot the original kernel with mem=1G while still booting the
39
* next kernel with full memory.
42
struct e820map e820_saved;
44
/* For PCI or other memory-mapped resources */
45
unsigned long pci_mem_start = 0xaeedbabe;
47
EXPORT_SYMBOL(pci_mem_start);
51
* This function checks if any part of the range <start,end> is mapped
55
e820_any_mapped(u64 start, u64 end, unsigned type)
59
for (i = 0; i < e820.nr_map; i++) {
60
struct e820entry *ei = &e820.map[i];
62
if (type && ei->type != type)
64
if (ei->addr >= end || ei->addr + ei->size <= start)
70
EXPORT_SYMBOL_GPL(e820_any_mapped);
73
* This function checks if the entire range <start,end> is mapped with type.
75
* Note: this function only works correct if the e820 table is sorted and
76
* not-overlapping, which is the case
78
int __init e820_all_mapped(u64 start, u64 end, unsigned type)
82
for (i = 0; i < e820.nr_map; i++) {
83
struct e820entry *ei = &e820.map[i];
85
if (type && ei->type != type)
87
/* is the region (part) in overlap with the current region ?*/
88
if (ei->addr >= end || ei->addr + ei->size <= start)
91
/* if the region is at the beginning of <start,end> we move
92
* start to the end of the region since it's ok until there
94
if (ei->addr <= start)
95
start = ei->addr + ei->size;
97
* if start is now at or beyond end, we're done, full
107
* Add a memory region to the kernel e820 map.
109
static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size,
112
int x = e820x->nr_map;
114
if (x >= ARRAY_SIZE(e820x->map)) {
115
printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
119
e820x->map[x].addr = start;
120
e820x->map[x].size = size;
121
e820x->map[x].type = type;
125
void __init e820_add_region(u64 start, u64 size, int type)
127
__e820_add_region(&e820, start, size, type);
130
static void __init e820_print_type(u32 type)
134
case E820_RESERVED_KERN:
135
printk(KERN_CONT "(usable)");
138
printk(KERN_CONT "(reserved)");
141
printk(KERN_CONT "(ACPI data)");
144
printk(KERN_CONT "(ACPI NVS)");
147
printk(KERN_CONT "(unusable)");
150
printk(KERN_CONT "type %u", type);
155
void __init e820_print_map(char *who)
159
for (i = 0; i < e820.nr_map; i++) {
160
printk(KERN_INFO " %s: %016Lx - %016Lx ", who,
161
(unsigned long long) e820.map[i].addr,
163
(e820.map[i].addr + e820.map[i].size));
164
e820_print_type(e820.map[i].type);
165
printk(KERN_CONT "\n");
170
* Sanitize the BIOS e820 map.
172
* Some e820 responses include overlapping entries. The following
173
* replaces the original e820 map with a new one, removing overlaps,
174
* and resolving conflicting memory types in favor of highest
177
* The input parameter biosmap points to an array of 'struct
178
* e820entry' which on entry has elements in the range [0, *pnr_map)
179
* valid, and which has space for up to max_nr_map entries.
180
* On return, the resulting sanitized e820 map entries will be in
181
* overwritten in the same location, starting at biosmap.
183
* The integer pointed to by pnr_map must be valid on entry (the
184
* current number of valid entries located at biosmap) and will
185
* be updated on return, with the new number of valid entries
186
* (something no more than max_nr_map.)
188
* The return value from sanitize_e820_map() is zero if it
189
* successfully 'sanitized' the map entries passed in, and is -1
190
* if it did nothing, which can happen if either of (1) it was
191
* only passed one map entry, or (2) any of the input map entries
192
* were invalid (start + size < start, meaning that the size was
193
* so big the described memory range wrapped around through zero.)
195
* Visually we're performing the following
196
* (1,2,3,4 = memory types)...
198
* Sample memory map (w/overlaps):
199
* ____22__________________
200
* ______________________4_
201
* ____1111________________
202
* _44_____________________
203
* 11111111________________
204
* ____________________33__
205
* ___________44___________
206
* __________33333_________
207
* ______________22________
208
* ___________________2222_
209
* _________111111111______
210
* _____________________11_
211
* _________________4______
213
* Sanitized equivalent (no overlap):
214
* 1_______________________
215
* _44_____________________
216
* ___1____________________
217
* ____22__________________
218
* ______11________________
219
* _________1______________
220
* __________3_____________
221
* ___________44___________
222
* _____________33_________
223
* _______________2________
224
* ________________1_______
225
* _________________4______
226
* ___________________2____
227
* ____________________33__
228
* ______________________4_
231
int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
234
struct change_member {
235
struct e820entry *pbios; /* pointer to original bios entry */
236
unsigned long long addr; /* address for this change point */
238
static struct change_member change_point_list[2*E820_X_MAX] __initdata;
239
static struct change_member *change_point[2*E820_X_MAX] __initdata;
240
static struct e820entry *overlap_list[E820_X_MAX] __initdata;
241
static struct e820entry new_bios[E820_X_MAX] __initdata;
242
struct change_member *change_tmp;
243
unsigned long current_type, last_type;
244
unsigned long long last_addr;
245
int chgidx, still_changing;
248
int old_nr, new_nr, chg_nr;
251
/* if there's only one memory region, don't bother */
256
BUG_ON(old_nr > max_nr_map);
258
/* bail out if we find any unreasonable addresses in bios map */
259
for (i = 0; i < old_nr; i++)
260
if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
263
/* create pointers for initial change-point information (for sorting) */
264
for (i = 0; i < 2 * old_nr; i++)
265
change_point[i] = &change_point_list[i];
267
/* record all known change-points (starting and ending addresses),
268
omitting those that are for empty memory regions */
270
for (i = 0; i < old_nr; i++) {
271
if (biosmap[i].size != 0) {
272
change_point[chgidx]->addr = biosmap[i].addr;
273
change_point[chgidx++]->pbios = &biosmap[i];
274
change_point[chgidx]->addr = biosmap[i].addr +
276
change_point[chgidx++]->pbios = &biosmap[i];
281
/* sort change-point list by memory addresses (low -> high) */
283
while (still_changing) {
285
for (i = 1; i < chg_nr; i++) {
286
unsigned long long curaddr, lastaddr;
287
unsigned long long curpbaddr, lastpbaddr;
289
curaddr = change_point[i]->addr;
290
lastaddr = change_point[i - 1]->addr;
291
curpbaddr = change_point[i]->pbios->addr;
292
lastpbaddr = change_point[i - 1]->pbios->addr;
295
* swap entries, when:
297
* curaddr > lastaddr or
298
* curaddr == lastaddr and curaddr == curpbaddr and
299
* lastaddr != lastpbaddr
301
if (curaddr < lastaddr ||
302
(curaddr == lastaddr && curaddr == curpbaddr &&
303
lastaddr != lastpbaddr)) {
304
change_tmp = change_point[i];
305
change_point[i] = change_point[i-1];
306
change_point[i-1] = change_tmp;
312
/* create a new bios memory map, removing overlaps */
313
overlap_entries = 0; /* number of entries in the overlap table */
314
new_bios_entry = 0; /* index for creating new bios map entries */
315
last_type = 0; /* start with undefined memory type */
316
last_addr = 0; /* start with 0 as last starting address */
318
/* loop through change-points, determining affect on the new bios map */
319
for (chgidx = 0; chgidx < chg_nr; chgidx++) {
320
/* keep track of all overlapping bios entries */
321
if (change_point[chgidx]->addr ==
322
change_point[chgidx]->pbios->addr) {
324
* add map entry to overlap list (> 1 entry
325
* implies an overlap)
327
overlap_list[overlap_entries++] =
328
change_point[chgidx]->pbios;
331
* remove entry from list (order independent,
334
for (i = 0; i < overlap_entries; i++) {
335
if (overlap_list[i] ==
336
change_point[chgidx]->pbios)
338
overlap_list[overlap_entries-1];
343
* if there are overlapping entries, decide which
344
* "type" to use (larger value takes precedence --
345
* 1=usable, 2,3,4,4+=unusable)
348
for (i = 0; i < overlap_entries; i++)
349
if (overlap_list[i]->type > current_type)
350
current_type = overlap_list[i]->type;
352
* continue building up new bios map based on this
355
if (current_type != last_type) {
356
if (last_type != 0) {
357
new_bios[new_bios_entry].size =
358
change_point[chgidx]->addr - last_addr;
360
* move forward only if the new size
363
if (new_bios[new_bios_entry].size != 0)
365
* no more space left for new
368
if (++new_bios_entry >= max_nr_map)
371
if (current_type != 0) {
372
new_bios[new_bios_entry].addr =
373
change_point[chgidx]->addr;
374
new_bios[new_bios_entry].type = current_type;
375
last_addr = change_point[chgidx]->addr;
377
last_type = current_type;
380
/* retain count for new bios entries */
381
new_nr = new_bios_entry;
383
/* copy new bios mapping into original location */
384
memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry));
390
static int __init __append_e820_map(struct e820entry *biosmap, int nr_map)
393
u64 start = biosmap->addr;
394
u64 size = biosmap->size;
395
u64 end = start + size;
396
u32 type = biosmap->type;
398
/* Overflow in 64 bits? Ignore the memory map. */
402
e820_add_region(start, size, type);
411
* Copy the BIOS e820 map into a safe place.
413
* Sanity-check it while we're at it..
415
* If we're lucky and live on a modern system, the setup code
416
* will have given us a memory map that we can use to properly
417
* set up memory. If we aren't, we'll fake a memory map.
419
static int __init append_e820_map(struct e820entry *biosmap, int nr_map)
421
/* Only one memory region (or negative)? Ignore it */
425
return __append_e820_map(biosmap, nr_map);
428
static u64 __init __e820_update_range(struct e820map *e820x, u64 start,
429
u64 size, unsigned old_type,
434
u64 real_updated_size = 0;
436
BUG_ON(old_type == new_type);
438
if (size > (ULLONG_MAX - start))
439
size = ULLONG_MAX - start;
442
printk(KERN_DEBUG "e820 update range: %016Lx - %016Lx ",
443
(unsigned long long) start,
444
(unsigned long long) end);
445
e820_print_type(old_type);
446
printk(KERN_CONT " ==> ");
447
e820_print_type(new_type);
448
printk(KERN_CONT "\n");
450
for (i = 0; i < e820x->nr_map; i++) {
451
struct e820entry *ei = &e820x->map[i];
452
u64 final_start, final_end;
455
if (ei->type != old_type)
458
ei_end = ei->addr + ei->size;
459
/* totally covered by new range? */
460
if (ei->addr >= start && ei_end <= end) {
462
real_updated_size += ei->size;
466
/* new range is totally covered? */
467
if (ei->addr < start && ei_end > end) {
468
__e820_add_region(e820x, start, size, new_type);
469
__e820_add_region(e820x, end, ei_end - end, ei->type);
470
ei->size = start - ei->addr;
471
real_updated_size += size;
475
/* partially covered */
476
final_start = max(start, ei->addr);
477
final_end = min(end, ei_end);
478
if (final_start >= final_end)
481
__e820_add_region(e820x, final_start, final_end - final_start,
484
real_updated_size += final_end - final_start;
487
* left range could be head or tail, so need to update
490
ei->size -= final_end - final_start;
491
if (ei->addr < final_start)
493
ei->addr = final_end;
495
return real_updated_size;
498
u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
501
return __e820_update_range(&e820, start, size, old_type, new_type);
504
static u64 __init e820_update_range_saved(u64 start, u64 size,
505
unsigned old_type, unsigned new_type)
507
return __e820_update_range(&e820_saved, start, size, old_type,
511
/* make e820 not cover the range */
512
u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type,
517
u64 real_removed_size = 0;
519
if (size > (ULLONG_MAX - start))
520
size = ULLONG_MAX - start;
523
printk(KERN_DEBUG "e820 remove range: %016Lx - %016Lx ",
524
(unsigned long long) start,
525
(unsigned long long) end);
527
e820_print_type(old_type);
528
printk(KERN_CONT "\n");
530
for (i = 0; i < e820.nr_map; i++) {
531
struct e820entry *ei = &e820.map[i];
532
u64 final_start, final_end;
535
if (checktype && ei->type != old_type)
538
ei_end = ei->addr + ei->size;
539
/* totally covered? */
540
if (ei->addr >= start && ei_end <= end) {
541
real_removed_size += ei->size;
542
memset(ei, 0, sizeof(struct e820entry));
546
/* new range is totally covered? */
547
if (ei->addr < start && ei_end > end) {
548
e820_add_region(end, ei_end - end, ei->type);
549
ei->size = start - ei->addr;
550
real_removed_size += size;
554
/* partially covered */
555
final_start = max(start, ei->addr);
556
final_end = min(end, ei_end);
557
if (final_start >= final_end)
559
real_removed_size += final_end - final_start;
562
* left range could be head or tail, so need to update
565
ei->size -= final_end - final_start;
566
if (ei->addr < final_start)
568
ei->addr = final_end;
570
return real_removed_size;
573
void __init update_e820(void)
577
nr_map = e820.nr_map;
578
if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))
580
e820.nr_map = nr_map;
581
printk(KERN_INFO "modified physical RAM map:\n");
582
e820_print_map("modified");
584
static void __init update_e820_saved(void)
588
nr_map = e820_saved.nr_map;
589
if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map))
591
e820_saved.nr_map = nr_map;
593
#define MAX_GAP_END 0x100000000ull
595
* Search for a gap in the e820 memory space from start_addr to end_addr.
597
__init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
598
unsigned long start_addr, unsigned long long end_addr)
600
unsigned long long last;
604
last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END;
607
unsigned long long start = e820.map[i].addr;
608
unsigned long long end = start + e820.map[i].size;
610
if (end < start_addr)
614
* Since "last" is at most 4GB, we know we'll
615
* fit in 32 bits if this condition is true
618
unsigned long gap = last - end;
620
if (gap >= *gapsize) {
633
* Search for the biggest gap in the low 32 bits of the e820
634
* memory space. We pass this space to PCI to assign MMIO resources
635
* for hotplug or unconfigured devices in.
636
* Hopefully the BIOS let enough space left.
638
__init void e820_setup_gap(void)
640
unsigned long gapstart, gapsize;
643
gapstart = 0x10000000;
645
found = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END);
649
gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024;
651
"PCI: Warning: Cannot find a gap in the 32bit address range\n"
652
"PCI: Unassigned devices with 32bit resource registers may break!\n");
657
* e820_reserve_resources_late protect stolen RAM already
659
pci_mem_start = gapstart;
662
"Allocating PCI resources starting at %lx (gap: %lx:%lx)\n",
663
pci_mem_start, gapstart, gapsize);
667
* Because of the size limitation of struct boot_params, only first
668
* 128 E820 memory entries are passed to kernel via
669
* boot_params.e820_map, others are passed via SETUP_E820_EXT node of
670
* linked list of struct setup_data, which is parsed here.
672
void __init parse_e820_ext(struct setup_data *sdata)
675
struct e820entry *extmap;
677
entries = sdata->len / sizeof(struct e820entry);
678
extmap = (struct e820entry *)(sdata->data);
679
__append_e820_map(extmap, entries);
680
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
681
printk(KERN_INFO "extended physical RAM map:\n");
682
e820_print_map("extended");
685
#if defined(CONFIG_X86_64) || \
686
(defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
688
* Find the ranges of physical addresses that do not correspond to
689
* e820 RAM areas and mark the corresponding pages as nosave for
690
* hibernation (32 bit) or software suspend and suspend to RAM (64 bit).
692
* This function requires the e820 map to be sorted and without any
693
* overlapping entries and assumes the first e820 area to be RAM.
695
void __init e820_mark_nosave_regions(unsigned long limit_pfn)
700
pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
701
for (i = 1; i < e820.nr_map; i++) {
702
struct e820entry *ei = &e820.map[i];
704
if (pfn < PFN_UP(ei->addr))
705
register_nosave_region(pfn, PFN_UP(ei->addr));
707
pfn = PFN_DOWN(ei->addr + ei->size);
708
if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
709
register_nosave_region(PFN_UP(ei->addr), pfn);
711
if (pfn >= limit_pfn)
717
#ifdef CONFIG_HIBERNATION
719
* Mark ACPI NVS memory region, so that we can save/restore it during
720
* hibernation and the subsequent resume.
722
static int __init e820_mark_nvs_memory(void)
726
for (i = 0; i < e820.nr_map; i++) {
727
struct e820entry *ei = &e820.map[i];
729
if (ei->type == E820_NVS)
730
suspend_nvs_register(ei->addr, ei->size);
735
core_initcall(e820_mark_nvs_memory);
739
* pre allocated 4k and reserved it in memblock and e820_saved
741
u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align)
747
for (start = startt; ; start += size) {
748
start = memblock_x86_find_in_range_size(start, &size, align);
749
if (start == MEMBLOCK_ERROR)
758
if (start + size > MAXMEM)
759
size = MAXMEM - start;
762
addr = round_down(start + size - sizet, align);
765
memblock_x86_reserve_range(addr, addr + sizet, "new next");
766
e820_update_range_saved(addr, sizet, E820_RAM, E820_RESERVED);
767
printk(KERN_INFO "update e820_saved for early_reserve_e820\n");
774
# ifdef CONFIG_X86_PAE
775
# define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT))
777
# define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT))
779
#else /* CONFIG_X86_32 */
780
# define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT
784
* Find the highest page frame number we have available
786
static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
789
unsigned long last_pfn = 0;
790
unsigned long max_arch_pfn = MAX_ARCH_PFN;
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;
797
if (ei->type != type)
800
start_pfn = ei->addr >> PAGE_SHIFT;
801
end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT;
803
if (start_pfn >= limit_pfn)
805
if (end_pfn > limit_pfn) {
806
last_pfn = limit_pfn;
809
if (end_pfn > last_pfn)
813
if (last_pfn > max_arch_pfn)
814
last_pfn = max_arch_pfn;
816
printk(KERN_INFO "last_pfn = %#lx max_arch_pfn = %#lx\n",
817
last_pfn, max_arch_pfn);
820
unsigned long __init e820_end_of_ram_pfn(void)
822
return e820_end_pfn(MAX_ARCH_PFN, E820_RAM);
825
unsigned long __init e820_end_of_low_ram_pfn(void)
827
return e820_end_pfn(1UL<<(32 - PAGE_SHIFT), E820_RAM);
830
static void early_panic(char *msg)
836
static int userdef __initdata;
838
/* "mem=nopentium" disables the 4MB page tables. */
839
static int __init parse_memopt(char *p)
846
if (!strcmp(p, "nopentium")) {
848
setup_clear_cpu_cap(X86_FEATURE_PSE);
851
printk(KERN_WARNING "mem=nopentium ignored! (only supported on x86_32)\n");
857
mem_size = memparse(p, &p);
858
/* don't remove all of memory when handling "mem={invalid}" param */
861
e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
865
early_param("mem", parse_memopt);
867
static int __init parse_memmap_opt(char *p)
870
u64 start_at, mem_size;
875
if (!strncmp(p, "exactmap", 8)) {
876
#ifdef CONFIG_CRASH_DUMP
878
* If we are doing a crash dump, we still need to know
879
* the real mem size before original memory map is
882
saved_max_pfn = e820_end_of_ram_pfn();
890
mem_size = memparse(p, &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);
905
e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
907
return *p == '\0' ? 0 : -EINVAL;
909
early_param("memmap", parse_memmap_opt);
911
void __init finish_e820_parsing(void)
914
u32 nr = e820.nr_map;
916
if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0)
917
early_panic("Invalid user supplied memory map");
920
printk(KERN_INFO "user-defined physical RAM map:\n");
921
e820_print_map("user");
925
static inline const char *e820_type_to_string(int e820_type)
928
case E820_RESERVED_KERN:
929
case E820_RAM: return "System RAM";
930
case E820_ACPI: return "ACPI Tables";
931
case E820_NVS: return "ACPI Non-volatile Storage";
932
case E820_UNUSABLE: return "Unusable memory";
933
default: return "reserved";
938
* Mark e820 reserved areas as busy for the resource manager.
940
static struct resource __initdata *e820_res;
941
void __init e820_reserve_resources(void)
944
struct resource *res;
947
res = alloc_bootmem(sizeof(struct resource) * e820.nr_map);
949
for (i = 0; i < e820.nr_map; i++) {
950
end = e820.map[i].addr + e820.map[i].size - 1;
951
if (end != (resource_size_t)end) {
955
res->name = e820_type_to_string(e820.map[i].type);
956
res->start = e820.map[i].addr;
959
res->flags = IORESOURCE_MEM;
962
* don't register the region that could be conflicted with
963
* pci device BAR resource and insert them later in
964
* pcibios_resource_survey()
966
if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20)) {
967
res->flags |= IORESOURCE_BUSY;
968
insert_resource(&iomem_resource, res);
973
for (i = 0; i < e820_saved.nr_map; i++) {
974
struct e820entry *entry = &e820_saved.map[i];
975
firmware_map_add_early(entry->addr,
976
entry->addr + entry->size - 1,
977
e820_type_to_string(entry->type));
981
/* How much should we pad RAM ending depending on where it is? */
982
static unsigned long ram_alignment(resource_size_t pos)
984
unsigned long mb = pos >> 20;
986
/* To 64kB in the first megabyte */
990
/* To 1MB in the first 16MB */
994
/* To 64MB for anything above that */
998
#define MAX_RESOURCE_SIZE ((resource_size_t)-1)
1000
void __init e820_reserve_resources_late(void)
1003
struct resource *res;
1006
for (i = 0; i < e820.nr_map; i++) {
1007
if (!res->parent && res->end)
1008
insert_resource_expand_to_fit(&iomem_resource, res);
1013
* Try to bump up RAM regions to reasonable boundaries to
1016
for (i = 0; i < e820.nr_map; i++) {
1017
struct e820entry *entry = &e820.map[i];
1020
if (entry->type != E820_RAM)
1022
start = entry->addr + entry->size;
1023
end = round_up(start, ram_alignment(start)) - 1;
1024
if (end > MAX_RESOURCE_SIZE)
1025
end = MAX_RESOURCE_SIZE;
1028
printk(KERN_DEBUG "reserve RAM buffer: %016llx - %016llx ",
1030
reserve_region_with_split(&iomem_resource, start, end,
1035
char *__init default_machine_specific_memory_setup(void)
1037
char *who = "BIOS-e820";
1040
* Try to copy the BIOS-supplied E820-map.
1042
* Otherwise fake a memory map; one section from 0k->640k,
1043
* the next section from 1mb->appropriate_mem_k
1045
new_nr = boot_params.e820_entries;
1046
sanitize_e820_map(boot_params.e820_map,
1047
ARRAY_SIZE(boot_params.e820_map),
1049
boot_params.e820_entries = new_nr;
1050
if (append_e820_map(boot_params.e820_map, boot_params.e820_entries)
1054
/* compare results from other methods and take the greater */
1055
if (boot_params.alt_mem_k
1056
< boot_params.screen_info.ext_mem_k) {
1057
mem_size = boot_params.screen_info.ext_mem_k;
1060
mem_size = boot_params.alt_mem_k;
1065
e820_add_region(0, LOWMEMSIZE(), E820_RAM);
1066
e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
1069
/* In case someone cares... */
1073
void __init setup_memory_map(void)
1077
who = x86_init.resources.memory_setup();
1078
memcpy(&e820_saved, &e820, sizeof(struct e820map));
1079
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
1080
e820_print_map(who);
1083
void __init memblock_x86_fill(void)
1089
* EFI may have more than 128 entries
1090
* We are safe to enable resizing, beause memblock_x86_fill()
1091
* is rather later for x86
1093
memblock_can_resize = 1;
1095
for (i = 0; i < e820.nr_map; i++) {
1096
struct e820entry *ei = &e820.map[i];
1098
end = ei->addr + ei->size;
1099
if (end != (resource_size_t)end)
1102
if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
1105
memblock_add(ei->addr, ei->size);
1109
memblock_dump_all();
1112
void __init memblock_find_dma_reserve(void)
1114
#ifdef CONFIG_X86_64
1118
* need to find out used area below MAX_DMA_PFN
1119
* need to use memblock to get free size in [0, MAX_DMA_PFN]
1120
* at first, and assume boot_mem will not take below MAX_DMA_PFN
1122
mem_size_pfn = memblock_x86_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
1123
free_size_pfn = memblock_x86_free_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
1124
set_dma_reserve(mem_size_pfn - free_size_pfn);