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/*
* EFI device path interface
*
* Copyright (c) 2017 Heinrich Schuchardt
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <efi_loader.h>
#define MAC_OUTPUT_LEN 22
#define UNKNOWN_OUTPUT_LEN 23
const efi_guid_t efi_guid_device_path_to_text_protocol =
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
static uint16_t *efi_convert_device_node_to_text(
struct efi_device_path_protocol *device_node,
bool display_only,
bool allow_shortcuts)
{
unsigned long buffer_size;
efi_status_t r;
uint16_t *buffer = NULL;
int i;
switch (device_node->type) {
case DEVICE_PATH_TYPE_END:
return NULL;
case DEVICE_PATH_TYPE_MESSAGING_DEVICE:
switch (device_node->sub_type) {
case DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR: {
struct efi_device_path_mac_addr *dp =
(struct efi_device_path_mac_addr *)device_node;
if (dp->if_type != 0 && dp->if_type != 1)
break;
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
2 * MAC_OUTPUT_LEN,
(void **)&buffer);
if (r != EFI_SUCCESS)
return NULL;
sprintf((char *)buffer,
"MAC(%02x%02x%02x%02x%02x%02x,0x%1x)",
dp->mac.addr[0], dp->mac.addr[1],
dp->mac.addr[2], dp->mac.addr[3],
dp->mac.addr[4], dp->mac.addr[5],
dp->if_type);
for (i = MAC_OUTPUT_LEN - 1; i >= 0; --i)
buffer[i] = ((uint8_t *)buffer)[i];
break;
}
}
break;
case DEVICE_PATH_TYPE_MEDIA_DEVICE:
switch (device_node->sub_type) {
case DEVICE_PATH_SUB_TYPE_FILE_PATH:
buffer_size = device_node->length - 4;
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
buffer_size, (void **) &buffer);
if (r != EFI_SUCCESS)
return NULL;
memcpy(buffer, device_node->data, buffer_size);
break;
}
break;
}
/*
* For all node types that we do not yet support return
* 'UNKNOWN(type,subtype)'.
*/
if (!buffer) {
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
2 * UNKNOWN_OUTPUT_LEN,
(void **)&buffer);
if (r != EFI_SUCCESS)
return NULL;
sprintf((char *)buffer,
"UNKNOWN(%04x,%04x)",
device_node->type,
device_node->sub_type);
for (i = UNKNOWN_OUTPUT_LEN - 1; i >= 0; --i)
buffer[i] = ((uint8_t *)buffer)[i];
}
return buffer;
}
static uint16_t EFIAPI *efi_convert_device_node_to_text_ext(
struct efi_device_path_protocol *device_node,
bool display_only,
bool allow_shortcuts)
{
uint16_t *buffer;
EFI_ENTRY("%p, %d, %d", device_node, display_only, allow_shortcuts);
buffer = efi_convert_device_node_to_text(device_node, display_only,
allow_shortcuts);
EFI_EXIT(EFI_SUCCESS);
return buffer;
}
static uint16_t EFIAPI *efi_convert_device_path_to_text(
struct efi_device_path_protocol *device_path,
bool display_only,
bool allow_shortcuts)
{
uint16_t *buffer;
EFI_ENTRY("%p, %d, %d", device_path, display_only, allow_shortcuts);
/*
* Our device paths are all of depth one. So its is sufficient to
* to convert the first node.
*/
buffer = efi_convert_device_node_to_text(device_path, display_only,
allow_shortcuts);
EFI_EXIT(EFI_SUCCESS);
return buffer;
}
const struct efi_device_path_to_text_protocol efi_device_path_to_text = {
.convert_device_node_to_text = efi_convert_device_node_to_text_ext,
.convert_device_path_to_text = efi_convert_device_path_to_text,
};
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