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[efi] Avoid returning uninitialised data from PCI configuration space reads

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Under UEFI, reads from PCI configuration space may fail.  If this
happens, we should return all-ones (which will mimic the behaviour of
an absent PCI device).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-09-04 16:00:11 +01:00
parent 4c5b7945c3
commit f94d651632
1 changed files with 3 additions and 0 deletions
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3
src/include/ipxe/efi/efi_pci_api.h
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@@ -55,6 +55,7 @@ static inline __always_inline int
PCIAPI_INLINE ( efi, pci_read_config_byte ) ( struct pci_device *pci,
unsigned int where,
uint8_t *value ) {
*value = 0xff;
return efipci_read ( pci,
EFIPCI_LOCATION ( where, EFIPCI_WIDTH_BYTE ),
value );
@@ -72,6 +73,7 @@ static inline __always_inline int
PCIAPI_INLINE ( efi, pci_read_config_word ) ( struct pci_device *pci,
unsigned int where,
uint16_t *value ) {
*value = 0xffff;
return efipci_read ( pci,
EFIPCI_LOCATION ( where, EFIPCI_WIDTH_WORD ),
value );
@@ -89,6 +91,7 @@ static inline __always_inline int
PCIAPI_INLINE ( efi, pci_read_config_dword ) ( struct pci_device *pci,
unsigned int where,
uint32_t *value ) {
*value = 0xffffffffUL;
return efipci_read ( pci,
EFIPCI_LOCATION ( where, EFIPCI_WIDTH_DWORD ),
value );