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x86: implement true end_pfn_mapped for 32bit 

Even on 32bit 2MB pages can map more memory than is in the true
max_low_pfn if end_pfn is not highmem and not aligned to 2MB.
Add a end_pfn_map similar to x86-64 that accounts for this
fact. This is important for code that really needs to know about
all mapping aliases.

Signed-off-by: Andi Kleen <ak@suse.de>
Cc: andreas.herrmann3@amd.com
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Andi Kleen 2008-03-12 03:53:27 +01:00 committed by Ingo Molnar
parent 41bd4eac74
commit 7d1116a92d
3 changed files with 7 additions and 2 deletions
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4
arch/x86/mm/init_32.c
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@ -51,6 +51,8 @@
unsigned int __VMALLOC_RESERVE = 128 << 20; unsigned int __VMALLOC_RESERVE = 128 << 20;
unsigned long end_pfn_map;
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
unsigned long highstart_pfn, highend_pfn; unsigned long highstart_pfn, highend_pfn;
@ -194,6 +196,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
set_pmd(pmd, pfn_pmd(pfn, prot)); set_pmd(pmd, pfn_pmd(pfn, prot));
pfn += PTRS_PER_PTE; pfn += PTRS_PER_PTE;
end_pfn_map = pfn;
continue; continue;
} }
pte = one_page_table_init(pmd); pte = one_page_table_init(pmd);
@ -208,6 +211,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
set_pte(pte, pfn_pte(pfn, prot)); set_pte(pte, pfn_pte(pfn, prot));
} }
end_pfn_map = pfn;
} }
} }
} }

4
include/asm-x86/page.h
View File

@ -36,7 +36,7 @@
#define max_pfn_mapped end_pfn_map #define max_pfn_mapped end_pfn_map
#else #else
#include <asm/page_32.h> #include <asm/page_32.h>
#define max_pfn_mapped max_low_pfn #define max_pfn_mapped end_pfn_map
#endif /* CONFIG_X86_64 */ #endif /* CONFIG_X86_64 */
#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET) #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
@ -50,6 +50,8 @@
extern int page_is_ram(unsigned long pagenr); extern int page_is_ram(unsigned long pagenr);
extern unsigned long end_pfn_map;
struct page; struct page;
static inline void clear_user_page(void *page, unsigned long vaddr, static inline void clear_user_page(void *page, unsigned long vaddr,

1
include/asm-x86/page_64.h
View File

@ -59,7 +59,6 @@ void clear_page(void *page);
void copy_page(void *to, void *from); void copy_page(void *to, void *from);
extern unsigned long end_pfn; extern unsigned long end_pfn;
extern unsigned long end_pfn_map;
extern unsigned long phys_base; extern unsigned long phys_base;
extern unsigned long __phys_addr(unsigned long); extern unsigned long __phys_addr(unsigned long);