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x86: implement true end_pfn_mapped for 32bit

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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 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;
}
}
}