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arch/x86: Do not access EFI memory map if it is not available

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Do not access EFI memory map if it is not available. At least
Xen dom0 EFI implementation does not have an access to it.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Daniel Kiper 2014-06-30 19:52:57 +02:00 committed by Matt Fleming
parent abc93f8eb6
commit 67a9b9c53c
1 changed files with 3 additions and 0 deletions
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3
arch/x86/platform/efi/efi.c
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@ -946,6 +946,9 @@ u64 efi_mem_attributes(unsigned long phys_addr)
efi_memory_desc_t *md;
void *p;
if (!efi_enabled(EFI_MEMMAP))
return 0;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if ((md->phys_addr <= phys_addr) &&