diff options
Diffstat (limited to 'src/drivers/net/efi/snpnet.c')
| -rw-r--r-- | src/drivers/net/efi/snpnet.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/drivers/net/efi/snpnet.c b/src/drivers/net/efi/snpnet.c index b8bf963..6ce731d 100644 --- a/src/drivers/net/efi/snpnet.c +++ b/src/drivers/net/efi/snpnet.c @@ -33,6 +33,7 @@ FILE_LICENCE ( GPL2_OR_LATER ); #include <ipxe/efi/Protocol/SimpleNetwork.h> #include <ipxe/efi/efi_driver.h> #include <ipxe/efi/efi_utils.h> +#include <ipxe/efi/efi_snp.h> #include "snpnet.h" /** @file @@ -485,6 +486,53 @@ static struct net_device_operations snpnet_operations = { }; /** + * Check to see if driver supports a device + * + * @v device EFI device handle + * @v protocol Protocol GUID + * @ret rc Return status code + */ +int snpnet_supported ( EFI_HANDLE device, EFI_GUID *protocol ) { + EFI_BOOT_SERVICES *bs = efi_systab->BootServices; + EFI_HANDLE parent; + EFI_STATUS efirc; + int rc; + + /* Check that this is not a device we are providing ourselves */ + if ( find_snpdev ( device ) != NULL ) { + DBGCP ( device, "HANDLE %s is provided by this binary\n", + efi_handle_name ( device ) ); + return -ENOTTY; + } + + /* Test for presence of protocol */ + if ( ( efirc = bs->OpenProtocol ( device, protocol, + NULL, efi_image_handle, device, + EFI_OPEN_PROTOCOL_TEST_PROTOCOL))!=0){ + DBGCP ( device, "HANDLE %s is not a %s device\n", + efi_handle_name ( device ), + efi_guid_ntoa ( protocol ) ); + return -EEFI ( efirc ); + } + + /* Check that there are no instances of this protocol further + * up this device path. + */ + if ( ( rc = efi_locate_device ( device, protocol, + &parent, 1 ) ) == 0 ) { + DBGC2 ( device, "HANDLE %s has %s-supporting parent ", + efi_handle_name ( device ), + efi_guid_ntoa ( protocol ) ); + DBGC2 ( device, "%s\n", efi_handle_name ( parent ) ); + return -ENOTTY; + } + + DBGC ( device, "HANDLE %s is a %s device\n", + efi_handle_name ( device ), efi_guid_ntoa ( protocol ) ); + return 0; +} + +/** * Attach driver to device * * @v efidev EFI device |