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authorAndi Kleen <andi@firstfloor.org>2008-03-12 03:53:27 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:41:30 +0200
commit7d1116a92d709c22e7db910724c9fcd2001b0499 (patch)
tree364fe750182fd5b8e53f14c64aed490388f6c5e6 /arch/x86/mm
parent41bd4eac748f39d7f3ed770fae3e595a747172bd (diff)
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>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/init_32.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 00168e65688a..73dd0601166a 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -51,6 +51,8 @@
unsigned int __VMALLOC_RESERVE = 128 << 20;
+unsigned long end_pfn_map;
+
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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));
pfn += PTRS_PER_PTE;
+ end_pfn_map = pfn;
continue;
}
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));
}
+ end_pfn_map = pfn;
}
}
}