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/** @file
* File managing the MMU for ARMv8 architecture in S-EL0
*
* Copyright (c) 2017 - 2018, ARM Limited. All rights reserved.
*
* This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License
* which accompanies this distribution. The full text of the license may be found at
* http://opensource.org/licenses/bsd-license.php
*
* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
*
**/
#include <Uefi.h>
#include <IndustryStandard/ArmMmSvc.h>
#include <Library/ArmLib.h>
#include <Library/ArmMmuLib.h>
#include <Library/ArmSvcLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
STATIC
EFI_STATUS
GetMemoryPermissions (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
OUT UINT32 *MemoryAttributes
)
{
ARM_SVC_ARGS GetMemoryPermissionsSvcArgs = {0};
GetMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES_AARCH64;
GetMemoryPermissionsSvcArgs.Arg1 = BaseAddress;
GetMemoryPermissionsSvcArgs.Arg2 = 0;
GetMemoryPermissionsSvcArgs.Arg3 = 0;
ArmCallSvc (&GetMemoryPermissionsSvcArgs);
if (GetMemoryPermissionsSvcArgs.Arg0 == ARM_SVC_SPM_RET_INVALID_PARAMS) {
*MemoryAttributes = 0;
return EFI_INVALID_PARAMETER;
}
*MemoryAttributes = GetMemoryPermissionsSvcArgs.Arg0;
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
RequestMemoryPermissionChange (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length,
IN UINTN Permissions
)
{
EFI_STATUS Status;
ARM_SVC_ARGS ChangeMemoryPermissionsSvcArgs = {0};
ChangeMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES_AARCH64;
ChangeMemoryPermissionsSvcArgs.Arg1 = BaseAddress;
ChangeMemoryPermissionsSvcArgs.Arg2 = EFI_SIZE_TO_PAGES(Length);
ChangeMemoryPermissionsSvcArgs.Arg3 = Permissions;
ArmCallSvc (&ChangeMemoryPermissionsSvcArgs);
Status = ChangeMemoryPermissionsSvcArgs.Arg0;
switch (Status) {
case ARM_SVC_SPM_RET_SUCCESS:
Status = EFI_SUCCESS;
break;
case ARM_SVC_SPM_RET_NOT_SUPPORTED:
Status = EFI_UNSUPPORTED;
break;
case ARM_SVC_SPM_RET_INVALID_PARAMS:
Status = EFI_INVALID_PARAMETER;
break;
case ARM_SVC_SPM_RET_DENIED:
Status = EFI_ACCESS_DENIED;
break;
case ARM_SVC_SPM_RET_NO_MEMORY:
Status = EFI_BAD_BUFFER_SIZE;
break;
default:
Status = EFI_ACCESS_DENIED;
ASSERT (0);
}
return Status;
}
EFI_STATUS
ArmSetMemoryRegionNoExec (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
)
{
EFI_STATUS Status;
UINT32 MemoryAttributes;
UINT32 CodePermission;
Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes);
if (Status != EFI_INVALID_PARAMETER) {
CodePermission = SET_MEM_ATTR_CODE_PERM_XN << SET_MEM_ATTR_CODE_PERM_SHIFT;
return RequestMemoryPermissionChange (
BaseAddress,
Length,
MemoryAttributes | CodePermission
);
}
return EFI_INVALID_PARAMETER;
}
EFI_STATUS
ArmClearMemoryRegionNoExec (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
)
{
EFI_STATUS Status;
UINT32 MemoryAttributes;
UINT32 CodePermission;
Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes);
if (Status != EFI_INVALID_PARAMETER) {
CodePermission = SET_MEM_ATTR_CODE_PERM_XN << SET_MEM_ATTR_CODE_PERM_SHIFT;
return RequestMemoryPermissionChange (
BaseAddress,
Length,
MemoryAttributes & ~CodePermission
);
}
return EFI_INVALID_PARAMETER;
}
EFI_STATUS
ArmSetMemoryRegionReadOnly (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
)
{
EFI_STATUS Status;
UINT32 MemoryAttributes;
UINT32 DataPermission;
Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes);
if (Status != EFI_INVALID_PARAMETER) {
DataPermission = SET_MEM_ATTR_DATA_PERM_RO << SET_MEM_ATTR_DATA_PERM_SHIFT;
return RequestMemoryPermissionChange (
BaseAddress,
Length,
MemoryAttributes | DataPermission
);
}
return EFI_INVALID_PARAMETER;
}
EFI_STATUS
ArmClearMemoryRegionReadOnly (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
)
{
EFI_STATUS Status;
UINT32 MemoryAttributes;
UINT32 PermissionRequest;
Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes);
if (Status != EFI_INVALID_PARAMETER) {
PermissionRequest = SET_MEM_ATTR_MAKE_PERM_REQUEST (SET_MEM_ATTR_DATA_PERM_RW,
MemoryAttributes);
return RequestMemoryPermissionChange (
BaseAddress,
Length,
PermissionRequest
);
}
return EFI_INVALID_PARAMETER;
}
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