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[efi] Generalise snpnet_pci_info() to efi_locate_device()

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-08-06 14:04:02 +01:00
parent 2bf428c2a9
commit 5c4f1da2ce
3 changed files with 63 additions and 34 deletions
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52
src/interface/efi/efi_utils.c
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@@ -48,6 +48,58 @@ EFI_DEVICE_PATH_PROTOCOL * efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path ) {
return path;
}
/**
* Locate parent device supporting a given protocol
*
* @v device EFI device handle
* @v protocol Protocol GUID
* @v parent Parent EFI device handle to fill in
* @ret rc Return status code
*/
int efi_locate_device ( EFI_HANDLE device, EFI_GUID *protocol,
EFI_HANDLE *parent ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
union {
EFI_DEVICE_PATH_PROTOCOL *path;
void *interface;
} path;
EFI_DEVICE_PATH_PROTOCOL *devpath;
EFI_STATUS efirc;
int rc;
/* Get device path */
if ( ( efirc = bs->OpenProtocol ( device,
&efi_device_path_protocol_guid,
&path.interface,
efi_image_handle, device,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( device, "EFIDEV %p %s cannot open device path: %s\n",
device, efi_handle_name ( device ), strerror ( rc ) );
goto err_open_device_path;
}
devpath = path.path;
/* Check for presence of specified protocol */
if ( ( efirc = bs->LocateDevicePath ( protocol, &devpath,
parent ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( device, "EFIDEV %p %s has no parent supporting %s: %s\n",
device, efi_handle_name ( device ),
efi_guid_ntoa ( protocol ), strerror ( rc ) );
goto err_locate_protocol;
}
/* Success */
rc = 0;
err_locate_protocol:
bs->CloseProtocol ( device, &efi_device_path_protocol_guid,
efi_image_handle, device );
err_open_device_path:
return rc;
}
/**
* Add EFI device as child of another EFI device
*