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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 <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
2008-07-10 20:38:26 -07:00
committed by Ingo Molnar
parent f302a5bbe5
commit f361a450bf
12 changed files with 74 additions and 17 deletions
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arch/x86/kernel/efi.c
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@@ -473,7 +473,7 @@ void __init efi_enter_virtual_mode(void)
size = md->num_pages << EFI_PAGE_SHIFT;
end = md->phys_addr + size;
if (PFN_UP(end) <= max_pfn_mapped)
if (PFN_UP(end) <= max_low_pfn_mapped)
va = __va(md->phys_addr);
else
va = efi_ioremap(md->phys_addr, size);