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x86: introduce max_low_pfn_mapped for 64-bit

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when more than 4g memory is installed, don't map the big hole below 4g.

Signed-off-by: Yinghai Lu <[email protected]>
Cc: Suresh Siddha <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Yinghai Lu 2008-07-10 20:38:26 -07:00 • committed by Ingo Molnar
commit f361a450bf
12 changed files with 74 additions and 17 deletions
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3
include/asm-x86/e820.h
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@ -99,7 +99,8 @@ extern void free_early(u64 start, u64 end);
extern void early_res_to_bootmem(u64 start, u64 end);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
extern unsigned long e820_end(void);
extern unsigned long e820_end_of_ram_pfn(void);
extern unsigned long e820_end_of_low_ram_pfn(void);
extern int e820_find_active_region(const struct e820entry *ei,
unsigned long start_pfn,
unsigned long last_pfn,

1
include/asm-x86/page.h
View file

@ -61,6 +61,7 @@ extern void map_devmem(unsigned long pfn, unsigned long size,
extern void unmap_devmem(unsigned long pfn, unsigned long size,
pgprot_t vma_prot);
extern unsigned long max_low_pfn_mapped;
extern unsigned long max_pfn_mapped;
struct page;