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/** @file
EFI firmware variable helpers
Copyright (c) 2016. Disk Cryptography Services for EFI (DCS), Alex Kolotnikov
Copyright (c) 2016. VeraCrypt, Mounir IDRASSI
This program and the accompanying materials are licensed and made available
under the terms and conditions of the GNU Lesser General Public License, version 3.0 (LGPL-3.0).
The full text of the license may be found at
https://opensource.org/licenses/LGPL-3.0
**/
#include <Library/CommonLib.h>
#include <Uefi.h>
#include <Guid/GlobalVariable.h>
#include <Protocol/DevicePath.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DevicePathLib.h>
#include <Library/BaseMemoryLib.h>
//////////////////////////////////////////////////////////////////////////
// Efi variables
//////////////////////////////////////////////////////////////////////////
EFI_STATUS
EfiGetVar(
IN CONST CHAR16* varName,
IN EFI_GUID* varGuid,
OUT VOID** varValue,
OUT UINTN* varSize,
OUT UINT32* varAttr
) {
EFI_STATUS Status;
CHAR8 *varData = NULL;
if (varSize == NULL) return EFI_INVALID_PARAMETER;
*varSize = 0;
if (varGuid == NULL) varGuid = &gEfiDcsVariableGuid;
Status = gST->RuntimeServices->GetVariable((CHAR16*)varName, varGuid, varAttr, varSize, varData);
if (Status == EFI_BUFFER_TOO_SMALL) {
varData = MEM_ALLOC(*varSize);
if (varData == NULL) {
return EFI_BUFFER_TOO_SMALL;
}
Status = gST->RuntimeServices->GetVariable((CHAR16*)varName, varGuid, varAttr, varSize, varData);
*varValue = varData;
}
return Status;
}
EFI_STATUS
EfiSetVar(
IN CONST CHAR16* varName,
IN EFI_GUID* varGuid,
IN VOID* varValue,
IN UINTN varSize,
IN UINT32 varAttr
) {
EFI_STATUS Status;
if (varGuid == NULL) varGuid = &gEfiDcsVariableGuid;
Status = gST->RuntimeServices->SetVariable((CHAR16*)varName, varGuid, varAttr, varSize, varValue);
return Status;
}
EFI_STATUS
BootOrderInsert(
IN CHAR16 *OrderVarName,
IN UINTN index,
UINT16 value)
{
EFI_STATUS res = EFI_NOT_READY;
UINT16* varBootOrderNew;
UINT16* varBootOrder;
UINTN varBootOrderSize;
UINT32 varBootOrderAttr;
UINTN BootOrderCount;
UINTN i;
UINTN j;
res = EfiGetVar(OrderVarName, &gEfiGlobalVariableGuid, &varBootOrder, &varBootOrderSize, &varBootOrderAttr);
if (EFI_ERROR(res)) {
res = EfiSetVar(OrderVarName, &gEfiGlobalVariableGuid, &value, 2,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS);
return res;
}
BootOrderCount = varBootOrderSize / sizeof(UINT16);
varBootOrderNew = MEM_ALLOC((BootOrderCount + 1) * sizeof(UINT16));
if (BootOrderCount < index) index = BootOrderCount - 1;
for (j = 0, i = 0; i < BootOrderCount; ++i) {
if (j == index) {
varBootOrderNew[j] = value;
j++;
}
if (varBootOrder[i] == value) {
continue;
}
varBootOrderNew[j] = varBootOrder[i];
++j;
}
BootOrderCount = j;
res = EfiSetVar(OrderVarName, &gEfiGlobalVariableGuid,
varBootOrderNew, BootOrderCount * sizeof(UINT16),
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS);
MEM_FREE(varBootOrderNew);
MEM_FREE(varBootOrder);
return res;
}
EFI_STATUS
BootOrderRemove(
IN CHAR16 *OrderVarName,
UINT16 value)
{
EFI_STATUS res = EFI_NOT_READY;
UINT16* varBootOrderNew;
UINT16* varBootOrder;
UINTN varBootOrderSize;
UINT32 varBootOrderAttr;
UINTN BootOrderCount;
UINTN i;
UINTN j;
res = EfiGetVar(OrderVarName, &gEfiGlobalVariableGuid, &varBootOrder, &varBootOrderSize, &varBootOrderAttr);
if (EFI_ERROR(res)) return res;
BootOrderCount = varBootOrderSize / sizeof(UINT16);
varBootOrderNew = MEM_ALLOC((BootOrderCount + 1) * sizeof(UINT16));
for (j = 0, i = 0; i < BootOrderCount; ++i) {
if (varBootOrder[i] == value) {
continue;
}
varBootOrderNew[j] = varBootOrder[i];
++j;
}
BootOrderCount = j;
res = EfiSetVar(OrderVarName, &gEfiGlobalVariableGuid,
varBootOrderNew, BootOrderCount * sizeof(UINT16),
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS);
MEM_FREE(varBootOrderNew);
MEM_FREE(varBootOrder);
return res;
}
EFI_STATUS
BootMenuItemRemove(
IN CHAR16 *VarName
)
{
EFI_STATUS res = EFI_NOT_READY;
res = EfiSetVar(
VarName, &gEfiGlobalVariableGuid,
NULL, 0,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS);
return res;
}
EFI_STATUS
BootMenuItemCreate(
IN CHAR16 *VarName,
IN CHAR16 *Desc,
IN EFI_HANDLE volumeHandle,
IN CHAR16 *Path,
IN BOOLEAN Reduced
)
{
EFI_STATUS res = EFI_NOT_READY;
UINT8* varBoot;
UINT8* TempByteBuffer;
UINTN DescSize;
UINTN FilePathSize;
EFI_DEVICE_PATH_PROTOCOL* DevPath;
EFI_DEVICE_PATH_PROTOCOL* DevicePath;
EFI_DEVICE_PATH_PROTOCOL* FileNode;
EFI_DEVICE_PATH_PROTOCOL* FilePath;
// Prepare
DevicePath = DevicePathFromHandle(volumeHandle);
if (Reduced) {
DevPath = DevicePath;
while (!IsDevicePathEnd(DevPath)) {
if ((DevicePathType(DevPath) == MEDIA_DEVICE_PATH) &&
(DevicePathSubType(DevPath) == MEDIA_HARDDRIVE_DP)) {
//
// If we find it use it instead
//
DevicePath = DevPath;
break;
}
DevPath = NextDevicePathNode(DevPath);
}
}
//
// append the file
//
FileNode = FileDevicePath(NULL, Path);
FilePath = AppendDevicePath(DevicePath, FileNode);
FreePool(FileNode);
//
// Add the option
//
DescSize = StrSize(Desc);
FilePathSize = GetDevicePathSize(FilePath);
varBoot = MEM_ALLOC(sizeof(UINT32) + sizeof(UINT16) + DescSize + FilePathSize);
if (varBoot != NULL) {
TempByteBuffer = varBoot;
*((UINT32 *)TempByteBuffer) = LOAD_OPTION_ACTIVE; // Attributes
TempByteBuffer += sizeof(UINT32);
*((UINT16 *)TempByteBuffer) = (UINT16)FilePathSize; // FilePathListLength
TempByteBuffer += sizeof(UINT16);
CopyMem(TempByteBuffer, Desc, DescSize);
TempByteBuffer += DescSize;
CopyMem(TempByteBuffer, FilePath, FilePathSize);
res = EfiSetVar(VarName, &gEfiGlobalVariableGuid,
varBoot, sizeof(UINT32) + sizeof(UINT16) + DescSize + FilePathSize,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS);
}
else {
return EFI_BUFFER_TOO_SMALL;
}
MEM_FREE(varBoot);
return res;
}
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