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ArmPkg/ArmMmuLib: Add MMU Library suitable for use in S-EL0. 

The Standalone MM environment runs in S-EL0 in AArch64 on ARM Standard
Platforms. Privileged firmware e.g. ARM Trusted Firmware sets up its
architectural context including the initial translation tables for the
S-EL1/EL0 translation regime. The MM environment will still request ARM
TF to change the memory attributes of memory regions during
initialization.

The Standalone MM image is a FV that encapsulates the MM foundation
and drivers. These are PE-COFF images with data and text segments.
To initialise the MM environment, Arm Trusted Firmware has to create
translation tables with sane default attributes for the memory
occupied by the FV. This library sends SVCs to ARM Trusted Firmware
to request memory permissions change for data and text segments.

This patch adds a simple MMU library suitable for execution in S-EL0 and
requesting memory permissions change operations from Arm Trusted Firmware.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sughosh Ganu <sughosh.ganu@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Achin Gupta 2018-11-27 16:13:57 +05:30 committed by Ard Biesheuvel
parent 37b2516bff
commit eed947be0b
5 changed files with 265 additions and 0 deletions
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1
ArmPkg/ArmPkg.dec
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@ -42,6 +42,7 @@
ArmMtlLib|ArmPlatformPkg/Include/Library/ArmMtlLib.h
ArmSvcLib|Include/Library/ArmSvcLib.h
OpteeLib|Include/Library/OpteeLib.h
StandaloneMmMmuLib|Include/Library/StandaloneMmMmuLib.h
[Guids.common]
gArmTokenSpaceGuid = { 0xBB11ECFE, 0x820F, 0x4968, { 0xBB, 0xA6, 0xF7, 0x6A, 0xFE, 0x30, 0x25, 0x96 } }

1
ArmPkg/ArmPkg.dsc
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@ -117,6 +117,7 @@
ArmPkg/Library/ArmPsciResetSystemLib/ArmPsciResetSystemLib.inf
ArmPkg/Library/ArmExceptionLib/ArmExceptionLib.inf
ArmPkg/Library/ArmExceptionLib/ArmRelocateExceptionLib.inf
ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf
ArmPkg/Drivers/CpuDxe/CpuDxe.inf
ArmPkg/Drivers/CpuPei/CpuPei.inf

42
ArmPkg/Include/Library/StandaloneMmMmuLib.h Normal file
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@ -0,0 +1,42 @@
/** @file
Copyright (c) 2018, ARM Ltd. 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.
**/
#ifndef __STANDALONEMM_MMU_LIB__
#define __STANDALONEMM_MMU_LIB__
EFI_STATUS
ArmSetMemoryRegionNoExec (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
);
EFI_STATUS
ArmClearMemoryRegionNoExec (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
);
EFI_STATUS
ArmSetMemoryRegionReadOnly (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
);
EFI_STATUS
ArmClearMemoryRegionReadOnly (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length
);
#endif /* __STANDALONEMM_MMU_LIB__ */

185
ArmPkg/Library/StandaloneMmMmuLib/Aarch64/ArmMmuStandaloneMmLib.c Normal file
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@ -0,0 +1,185 @@
/** @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;
}

36
ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf Normal file
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@ -0,0 +1,36 @@
#/** @file
#
# 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.
#
#
#**/
[Defines]
INF_VERSION = 0x0001001A
BASE_NAME = ArmMmuStandaloneMmCoreLib
FILE_GUID = da8f0232-fb14-42f0-922c-63104d2c70bd
MODULE_TYPE = MM_CORE_STANDALONE
VERSION_STRING = 1.0
LIBRARY_CLASS = StandaloneMmMmuLib
PI_SPECIFICATION_VERSION = 0x00010032
[Sources.AARCH64]
Aarch64/ArmMmuStandaloneMmLib.c
[Packages]
ArmPkg/ArmPkg.dec
MdePkg/MdePkg.dec
[LibraryClasses]
ArmLib
CacheMaintenanceLib
MemoryAllocationLib