}
/**
+ * efi_locate_device_path() - Get the device path and handle of an device
+ * implementing a protocol
+ * @protocol: GUID of the protocol
+ * @device_path: device path
+ * @device: handle of the device
+ *
+ * This function implements the LocateDevicePath service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * Return: status code
+ */
+static efi_status_t EFIAPI efi_locate_device_path(
+ const efi_guid_t *protocol,
+ struct efi_device_path **device_path,
+ efi_handle_t *device)
+{
+ struct efi_device_path *dp;
+ size_t i;
+ struct efi_handler *handler;
+ efi_handle_t *handles;
+ size_t len, len_dp;
+ size_t len_best = 0;
+ efi_uintn_t no_handles;
+ u8 *remainder;
+ efi_status_t ret;
+
+ EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
+
+ if (!protocol || !device_path || !*device_path) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ /* Find end of device path */
+ len = efi_dp_instance_size(*device_path);
+
+ /* Get all handles implementing the protocol */
+ ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
+ &no_handles, &handles));
+ if (ret != EFI_SUCCESS)
+ goto out;
+
+ for (i = 0; i < no_handles; ++i) {
+ /* Find the device path protocol */
+ ret = efi_search_protocol(handles[i], &efi_guid_device_path,
+ &handler);
+ if (ret != EFI_SUCCESS)
+ continue;
+ dp = (struct efi_device_path *)handler->protocol_interface;
+ len_dp = efi_dp_instance_size(dp);
+ /*
+ * This handle can only be a better fit
+ * if its device path length is longer than the best fit and
+ * if its device path length is shorter of equal the searched
+ * device path.
+ */
+ if (len_dp <= len_best || len_dp > len)
+ continue;
+ /* Check if dp is a subpath of device_path */
+ if (memcmp(*device_path, dp, len_dp))
+ continue;
+ if (!device) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+ *device = handles[i];
+ len_best = len_dp;
+ }
+ if (len_best) {
+ remainder = (u8 *)*device_path + len_best;
+ *device_path = (struct efi_device_path *)remainder;
+ ret = EFI_SUCCESS;
+ } else {
+ ret = EFI_NOT_FOUND;
+ }
+out:
+ return EFI_EXIT(ret);
+}
+
+/**
* efi_load_image_from_path() - load an image using a file path
*
* Read a file into a buffer allocated as EFI_BOOT_SERVICES_DATA. It is the
}
/**
- * efi_locate_device_path() - Get the device path and handle of an device
- * implementing a protocol
- * @protocol: GUID of the protocol
- * @device_path: device path
- * @device: handle of the device
- *
- * This function implements the LocateDevicePath service.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * Return: status code
- */
-static efi_status_t EFIAPI efi_locate_device_path(
- const efi_guid_t *protocol,
- struct efi_device_path **device_path,
- efi_handle_t *device)
-{
- struct efi_device_path *dp;
- size_t i;
- struct efi_handler *handler;
- efi_handle_t *handles;
- size_t len, len_dp;
- size_t len_best = 0;
- efi_uintn_t no_handles;
- u8 *remainder;
- efi_status_t ret;
-
- EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
-
- if (!protocol || !device_path || !*device_path) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
-
- /* Find end of device path */
- len = efi_dp_instance_size(*device_path);
-
- /* Get all handles implementing the protocol */
- ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
- &no_handles, &handles));
- if (ret != EFI_SUCCESS)
- goto out;
-
- for (i = 0; i < no_handles; ++i) {
- /* Find the device path protocol */
- ret = efi_search_protocol(handles[i], &efi_guid_device_path,
- &handler);
- if (ret != EFI_SUCCESS)
- continue;
- dp = (struct efi_device_path *)handler->protocol_interface;
- len_dp = efi_dp_instance_size(dp);
- /*
- * This handle can only be a better fit
- * if its device path length is longer than the best fit and
- * if its device path length is shorter of equal the searched
- * device path.
- */
- if (len_dp <= len_best || len_dp > len)
- continue;
- /* Check if dp is a subpath of device_path */
- if (memcmp(*device_path, dp, len_dp))
- continue;
- if (!device) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- *device = handles[i];
- len_best = len_dp;
- }
- if (len_best) {
- remainder = (u8 *)*device_path + len_best;
- *device_path = (struct efi_device_path *)remainder;
- ret = EFI_SUCCESS;
- } else {
- ret = EFI_NOT_FOUND;
- }
-out:
- return EFI_EXIT(ret);
-}
-
-/**
* efi_install_multiple_protocol_interfaces() - Install multiple protocol
* interfaces
* @handle: handle on which the protocol interfaces shall be installed