2 * EFI device path interface
4 * Copyright (c) 2017 Heinrich Schuchardt
6 * SPDX-License-Identifier: GPL-2.0+
10 #include <efi_loader.h>
12 #define MAC_OUTPUT_LEN 22
13 #define UNKNOWN_OUTPUT_LEN 23
15 const efi_guid_t efi_guid_device_path_to_text_protocol =
16 EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
18 static uint16_t *efi_convert_device_node_to_text(
19 struct efi_device_path_protocol *device_node,
23 unsigned long buffer_size;
25 uint16_t *buffer = NULL;
28 switch (device_node->type) {
29 case DEVICE_PATH_TYPE_END:
31 case DEVICE_PATH_TYPE_MESSAGING_DEVICE:
32 switch (device_node->sub_type) {
33 case DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR: {
34 struct efi_device_path_mac_addr *dp =
35 (struct efi_device_path_mac_addr *)device_node;
37 if (dp->if_type != 0 && dp->if_type != 1)
39 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
44 sprintf((char *)buffer,
45 "MAC(%02x%02x%02x%02x%02x%02x,0x%1x)",
46 dp->mac.addr[0], dp->mac.addr[1],
47 dp->mac.addr[2], dp->mac.addr[3],
48 dp->mac.addr[4], dp->mac.addr[5],
50 for (i = MAC_OUTPUT_LEN - 1; i >= 0; --i)
51 buffer[i] = ((uint8_t *)buffer)[i];
55 case DEVICE_PATH_TYPE_MEDIA_DEVICE:
56 switch (device_node->sub_type) {
57 case DEVICE_PATH_SUB_TYPE_FILE_PATH:
58 buffer_size = device_node->length - 4;
59 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
60 buffer_size, (void **) &buffer);
63 memcpy(buffer, device_node->data, buffer_size);
69 * For all node types that we do not yet support return
70 * 'UNKNOWN(type,subtype)'.
73 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
74 2 * UNKNOWN_OUTPUT_LEN,
78 sprintf((char *)buffer,
81 device_node->sub_type);
82 for (i = UNKNOWN_OUTPUT_LEN - 1; i >= 0; --i)
83 buffer[i] = ((uint8_t *)buffer)[i];
89 static uint16_t EFIAPI *efi_convert_device_node_to_text_ext(
90 struct efi_device_path_protocol *device_node,
96 EFI_ENTRY("%p, %d, %d", device_node, display_only, allow_shortcuts);
98 buffer = efi_convert_device_node_to_text(device_node, display_only,
101 EFI_EXIT(EFI_SUCCESS);
105 static uint16_t EFIAPI *efi_convert_device_path_to_text(
106 struct efi_device_path_protocol *device_path,
108 bool allow_shortcuts)
112 EFI_ENTRY("%p, %d, %d", device_path, display_only, allow_shortcuts);
115 * Our device paths are all of depth one. So its is sufficient to
116 * to convert the first node.
118 buffer = efi_convert_device_node_to_text(device_path, display_only,
121 EFI_EXIT(EFI_SUCCESS);
125 const struct efi_device_path_to_text_protocol efi_device_path_to_text = {
126 .convert_device_node_to_text = efi_convert_device_node_to_text_ext,
127 .convert_device_path_to_text = efi_convert_device_path_to_text,