blob: e219f84b28d229924d975a3418e0e904df8b06e8 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* EFI device path interface
*
* Copyright (c) 2017 Heinrich Schuchardt
*/
#include <common.h>
#include <efi_loader.h>
#define MAC_OUTPUT_LEN 22
#define UNKNOWN_OUTPUT_LEN 23
#define MAX_NODE_LEN 512
#define MAX_PATH_LEN 1024
const efi_guid_t efi_guid_device_path_to_text_protocol =
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
/**
* efi_str_to_u16() - convert ASCII string to UTF-16
*
* A u16 buffer is allocated from pool. The ASCII string is copied to the u16
* buffer.
*
* @str: ASCII string
* Return: UTF-16 string. NULL if out of memory.
*/
static u16 *efi_str_to_u16(char *str)
{
efi_uintn_t len;
u16 *out;
efi_status_t ret;
len = strlen(str) + 1;
ret = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, len * sizeof(u16),
(void **)&out);
if (ret != EFI_SUCCESS)
return NULL;
ascii2unicode(out, str);
return out;
}
static char *dp_unknown(char *s, struct efi_device_path *dp)
{
s += sprintf(s, "UNKNOWN(%04x,%04x)", dp->type, dp->sub_type);
return s;
}
static char *dp_hardware(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_MEMORY: {
struct efi_device_path_memory *mdp =
(struct efi_device_path_memory *)dp;
s += sprintf(s, "MemoryMapped(0x%x,0x%llx,0x%llx)",
mdp->memory_type,
mdp->start_address,
mdp->end_address);
break;
}
case DEVICE_PATH_SUB_TYPE_VENDOR: {
struct efi_device_path_vendor *vdp =
(struct efi_device_path_vendor *)dp;
s += sprintf(s, "VenHw(%pUl)", &vdp->guid);
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
static char *dp_acpi(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_ACPI_DEVICE: {
struct efi_device_path_acpi_path *adp =
(struct efi_device_path_acpi_path *)dp;
s += sprintf(s, "Acpi(PNP%04x", EISA_PNP_NUM(adp->hid));
if (adp->uid)
s += sprintf(s, ",%d", adp->uid);
s += sprintf(s, ")");
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
static char *dp_msging(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_MSG_ATAPI: {
struct efi_device_path_atapi *ide =
(struct efi_device_path_atapi *)dp;
s += sprintf(s, "Ata(%d,%d,%d)", ide->primary_secondary,
ide->slave_master, ide->logical_unit_number);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_SCSI: {
struct efi_device_path_scsi *ide =
(struct efi_device_path_scsi *)dp;
s += sprintf(s, "Scsi(%u,%u)", ide->target_id,
ide->logical_unit_number);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_USB: {
struct efi_device_path_usb *udp =
(struct efi_device_path_usb *)dp;
s += sprintf(s, "USB(0x%x,0x%x)", udp->parent_port_number,
udp->usb_interface);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR: {
struct efi_device_path_mac_addr *mdp =
(struct efi_device_path_mac_addr *)dp;
if (mdp->if_type != 0 && mdp->if_type != 1)
break;
s += sprintf(s, "MAC(%02x%02x%02x%02x%02x%02x,0x%1x)",
mdp->mac.addr[0], mdp->mac.addr[1],
mdp->mac.addr[2], mdp->mac.addr[3],
mdp->mac.addr[4], mdp->mac.addr[5],
mdp->if_type);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS: {
struct efi_device_path_usb_class *ucdp =
(struct efi_device_path_usb_class *)dp;
s += sprintf(s, "USBClass(%x,%x,%x,%x,%x)",
ucdp->vendor_id, ucdp->product_id,
ucdp->device_class, ucdp->device_subclass,
ucdp->device_protocol);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_SD:
case DEVICE_PATH_SUB_TYPE_MSG_MMC: {
const char *typename =
(dp->sub_type == DEVICE_PATH_SUB_TYPE_MSG_SD) ?
"SD" : "eMMC";
struct efi_device_path_sd_mmc_path *sddp =
(struct efi_device_path_sd_mmc_path *)dp;
s += sprintf(s, "%s(%u)", typename, sddp->slot_number);
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
/*
* Convert a media device path node to text.
*
* @s output buffer
* @dp device path node
* @return next unused buffer address
*/
static char *dp_media(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH: {
struct efi_device_path_hard_drive_path *hddp =
(struct efi_device_path_hard_drive_path *)dp;
void *sig = hddp->partition_signature;
u64 start;
u64 end;
/* Copy from packed structure to aligned memory */
memcpy(&start, &hddp->partition_start, sizeof(start));
memcpy(&end, &hddp->partition_end, sizeof(end));
switch (hddp->signature_type) {
case SIG_TYPE_MBR: {
u32 signature;
memcpy(&signature, sig, sizeof(signature));
s += sprintf(
s, "HD(%d,MBR,0x%08x,0x%llx,0x%llx)",
hddp->partition_number, signature, start, end);
break;
}
case SIG_TYPE_GUID:
s += sprintf(
s, "HD(%d,GPT,%pUl,0x%llx,0x%llx)",
hddp->partition_number, sig, start, end);
break;
default:
s += sprintf(
s, "HD(%d,0x%02x,0,0x%llx,0x%llx)",
hddp->partition_number, hddp->partmap_type,
start, end);
break;
}
break;
}
case DEVICE_PATH_SUB_TYPE_CDROM_PATH: {
struct efi_device_path_cdrom_path *cddp =
(struct efi_device_path_cdrom_path *)dp;
s += sprintf(s, "CDROM(0x%x)", cddp->boot_entry);
break;
}
case DEVICE_PATH_SUB_TYPE_FILE_PATH: {
struct efi_device_path_file_path *fp =
(struct efi_device_path_file_path *)dp;
int slen = (dp->length - sizeof(*dp)) / 2;
if (slen > MAX_NODE_LEN - 2)
slen = MAX_NODE_LEN - 2;
s += sprintf(s, "%-.*ls", slen, fp->str);
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
/*
* Converts a single node to a char string.
*
* @buffer output buffer
* @dp device path or node
* @return end of string
*/
static char *efi_convert_single_device_node_to_text(
char *buffer,
struct efi_device_path *dp)
{
char *str = buffer;
switch (dp->type) {
case DEVICE_PATH_TYPE_HARDWARE_DEVICE:
str = dp_hardware(str, dp);
break;
case DEVICE_PATH_TYPE_ACPI_DEVICE:
str = dp_acpi(str, dp);
break;
case DEVICE_PATH_TYPE_MESSAGING_DEVICE:
str = dp_msging(str, dp);
break;
case DEVICE_PATH_TYPE_MEDIA_DEVICE:
str = dp_media(str, dp);
break;
case DEVICE_PATH_TYPE_END:
break;
default:
str = dp_unknown(str, dp);
}
*str = '\0';
return str;
}
/*
* This function implements the ConvertDeviceNodeToText service of the
* EFI_DEVICE_PATH_TO_TEXT_PROTOCOL.
* See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* device_node device node to be converted
* display_only true if the shorter text representation shall be used
* allow_shortcuts true if shortcut forms may be used
* @return text representation of the device path
* NULL if out of memory of device_path is NULL
*/
static uint16_t EFIAPI *efi_convert_device_node_to_text(
struct efi_device_path *device_node,
bool display_only,
bool allow_shortcuts)
{
char str[MAX_NODE_LEN];
uint16_t *text = NULL;
EFI_ENTRY("%p, %d, %d", device_node, display_only, allow_shortcuts);
if (!device_node)
goto out;
efi_convert_single_device_node_to_text(str, device_node);
text = efi_str_to_u16(str);
out:
EFI_EXIT(EFI_SUCCESS);
return text;
}
/*
* This function implements the ConvertDevicePathToText service of the
* EFI_DEVICE_PATH_TO_TEXT_PROTOCOL.
* See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* device_path device path to be converted
* display_only true if the shorter text representation shall be used
* allow_shortcuts true if shortcut forms may be used
* @return text representation of the device path
* NULL if out of memory of device_path is NULL
*/
static uint16_t EFIAPI *efi_convert_device_path_to_text(
struct efi_device_path *device_path,
bool display_only,
bool allow_shortcuts)
{
uint16_t *text = NULL;
char buffer[MAX_PATH_LEN];
char *str = buffer;
EFI_ENTRY("%p, %d, %d", device_path, display_only, allow_shortcuts);
if (!device_path)
goto out;
while (device_path &&
str + MAX_NODE_LEN < buffer + MAX_PATH_LEN) {
*str++ = '/';
str = efi_convert_single_device_node_to_text(str, device_path);
device_path = efi_dp_next(device_path);
}
text = efi_str_to_u16(buffer);
out:
EFI_EXIT(EFI_SUCCESS);
return text;
}
/* helper for debug prints.. efi_free_pool() the result. */
uint16_t *efi_dp_str(struct efi_device_path *dp)
{
return EFI_CALL(efi_convert_device_path_to_text(dp, true, true));
}
const struct efi_device_path_to_text_protocol efi_device_path_to_text = {
.convert_device_node_to_text = efi_convert_device_node_to_text,
.convert_device_path_to_text = efi_convert_device_path_to_text,
};