+// SPDX-License-Identifier: GPL-2.0+
/*
* EFI device path interface
*
* Copyright (c) 2017 Leif Lindholm
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
const efi_guid_t efi_guid_device_path_utilities_protocol =
EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID;
+/*
+ * Get size of a device path.
+ *
+ * This function implements the GetDevicePathSize service of the device path
+ * utilities protocol. The device path length includes the end of path tag
+ * which may be an instance end.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @return size in bytes
+ */
static efi_uintn_t EFIAPI get_device_path_size(
const struct efi_device_path *device_path)
{
efi_uintn_t sz = 0;
- EFI_ENTRY("%p", device_path);
+ EFI_ENTRY("%pD", device_path);
/* size includes the END node: */
if (device_path)
sz = efi_dp_size(device_path) + sizeof(struct efi_device_path);
return EFI_EXIT(sz);
}
+/*
+ * Duplicate a device path.
+ *
+ * This function implements the DuplicateDevicePath service of the device path
+ * utilities protocol.
+ *
+ * The UEFI spec does not indicate what happens to the end tag. We follow the
+ * EDK2 logic: In case the device path ends with an end of instance tag, the
+ * copy will also end with an end of instance tag.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @return copy of the device path
+ */
static struct efi_device_path * EFIAPI duplicate_device_path(
const struct efi_device_path *device_path)
{
- EFI_ENTRY("%p", device_path);
+ EFI_ENTRY("%pD", device_path);
return EFI_EXIT(efi_dp_dup(device_path));
}
+/*
+ * Append device path.
+ *
+ * This function implements the AppendDevicePath service of the device path
+ * utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @src1 1st device path
+ * @src2 2nd device path
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI append_device_path(
const struct efi_device_path *src1,
const struct efi_device_path *src2)
{
- EFI_ENTRY("%p, %p", src1, src2);
+ EFI_ENTRY("%pD, %pD", src1, src2);
return EFI_EXIT(efi_dp_append(src1, src2));
}
+/*
+ * Append device path node.
+ *
+ * This function implements the AppendDeviceNode service of the device path
+ * utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @device_node device node
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI append_device_node(
const struct efi_device_path *device_path,
const struct efi_device_path *device_node)
{
- EFI_ENTRY("%p, %p", device_path, device_node);
+ EFI_ENTRY("%pD, %p", device_path, device_node);
return EFI_EXIT(efi_dp_append_node(device_path, device_node));
}
+/*
+ * Append device path instance.
+ *
+ * This function implements the AppendDevicePathInstance service of the device
+ * path utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path 1st device path
+ * @device_path_instance 2nd device path
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI append_device_path_instance(
const struct efi_device_path *device_path,
const struct efi_device_path *device_path_instance)
{
- EFI_ENTRY("%p, %p", device_path, device_path_instance);
- return EFI_EXIT(NULL);
+ EFI_ENTRY("%pD, %pD", device_path, device_path_instance);
+ return EFI_EXIT(efi_dp_append_instance(device_path,
+ device_path_instance));
}
+/*
+ * Get next device path instance.
+ *
+ * This function implements the GetNextDevicePathInstance service of the device
+ * path utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path_instance next device path instance
+ * @device_path_instance_size size of the device path instance
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI get_next_device_path_instance(
struct efi_device_path **device_path_instance,
efi_uintn_t *device_path_instance_size)
{
- EFI_ENTRY("%p, %p", device_path_instance, device_path_instance_size);
- return EFI_EXIT(NULL);
+ EFI_ENTRY("%pD, %p", device_path_instance, device_path_instance_size);
+ return EFI_EXIT(efi_dp_get_next_instance(device_path_instance,
+ device_path_instance_size));
}
+/*
+ * Check if a device path contains more than one instance.
+ *
+ * This function implements the AppendDeviceNode service of the device path
+ * utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @device_node device node
+ * @return concatenated device path
+ */
static bool EFIAPI is_device_path_multi_instance(
const struct efi_device_path *device_path)
{
- EFI_ENTRY("%p", device_path);
- return EFI_EXIT(false);
+ EFI_ENTRY("%pD", device_path);
+ return EFI_EXIT(efi_dp_is_multi_instance(device_path));
}
+/*
+ * Create device node.
+ *
+ * This function implements the CreateDeviceNode service of the device path
+ * utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @node_type node type
+ * @node_sub_type node sub type
+ * @node_length node length
+ * @return device path node
+ */
static struct efi_device_path * EFIAPI create_device_node(
uint8_t node_type, uint8_t node_sub_type, uint16_t node_length)
{
EFI_ENTRY("%u, %u, %u", node_type, node_sub_type, node_length);
- return EFI_EXIT(NULL);
+ return EFI_EXIT(efi_dp_create_device_node(node_type, node_sub_type,
+ node_length));
}
const struct efi_device_path_utilities_protocol efi_device_path_utilities = {
projects / oweals / u-boot.git / blobdiff