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/*
* EFI Boot Guard
*
* Copyright (c) Siemens AG, 2023
*
* Authors:
* Felix Moessbauer <felix.moessbauer@siemens.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include <efi.h>
#include <efilib.h>
#include "loader_interface.h"
#include "utils.h"
EFI_GUID vendor_guid = {0x4a67b082,
0x0a4c,
0x41cf,
{0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f}};
EFI_STATUS set_bg_interface_vars(const BG_INTERFACE_PARAMS *params)
{
EFI_STATUS status = EFI_SUCCESS;
UINT32 attribs =
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
// only set this if not set by a previous stage loader
UINTN readsize = 0;
if (RT->GetVariable(L"LoaderDevicePartUUID", &vendor_guid, NULL,
&readsize, NULL) == EFI_NOT_FOUND) {
status = RT->SetVariable(
L"LoaderDevicePartUUID", &vendor_guid, attribs,
StrLen(params->loader_device_part_uuid) *
sizeof(UINT16),
params->loader_device_part_uuid);
}
return status;
}
CHAR16 *disk_get_part_uuid(EFI_HANDLE *handle)
{
EFI_STATUS err;
EFI_DEVICE_PATH *dp;
err = BS->HandleProtocol(handle, &DevicePathProtocol, (void **)&dp);
if (EFI_ERROR(err)) {
return NULL;
}
for (; !IsDevicePathEnd(dp); dp = NextDevicePathNode(dp)) {
if (dp->Type != MEDIA_DEVICE_PATH ||
dp->SubType != MEDIA_HARDDRIVE_DP) {
continue;
}
HARDDRIVE_DEVICE_PATH *hd = (HARDDRIVE_DEVICE_PATH *)dp;
if (hd->SignatureType != SIGNATURE_TYPE_GUID) {
continue;
}
UINT16 *buffer = AllocatePool(sizeof(UINT16) * 37);
GuidToString(buffer, (EFI_GUID *)hd->Signature);
return buffer;
}
return NULL;
}
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