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/** @file
* File managing the MMU for ARMv8 architecture in S-EL0
*
* Copyright (c) 2017 - 2021, Arm Limited. All rights reserved.<BR>
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <Uefi.h>
#include <IndustryStandard/ArmMmSvc.h>
#include <IndustryStandard/ArmFfaSvc.h>
#include <Library/ArmLib.h>
#include <Library/ArmMmuLib.h>
#include <Library/ArmSvcLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
STATIC
EFI_STATUS
GetMemoryPermissions (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
OUT UINT32 *MemoryAttributes
)
{
INT32 Ret;
ARM_SVC_ARGS GetMemoryPermissionsSvcArgs;
BOOLEAN FfaEnabled;
ZeroMem (&GetMemoryPermissionsSvcArgs, sizeof (ARM_SVC_ARGS));
FfaEnabled = FeaturePcdGet (PcdFfaEnable);
if (FfaEnabled) {
GetMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ_AARCH64;
GetMemoryPermissionsSvcArgs.Arg1 = ARM_FFA_DESTINATION_ENDPOINT_ID;
GetMemoryPermissionsSvcArgs.Arg2 = 0;
GetMemoryPermissionsSvcArgs.Arg3 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES_AARCH64;
GetMemoryPermissionsSvcArgs.Arg4 = BaseAddress;
} else {
GetMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES_AARCH64;
GetMemoryPermissionsSvcArgs.Arg1 = BaseAddress;
GetMemoryPermissionsSvcArgs.Arg2 = 0;
GetMemoryPermissionsSvcArgs.Arg3 = 0;
}
*MemoryAttributes = 0;
ArmCallSvc (&GetMemoryPermissionsSvcArgs);
if (FfaEnabled) {
// Getting memory attributes is an atomic call, with
// StandaloneMm at S-EL0 being the caller and the SPM
// core being the callee. Thus there won't be a
// FFA_INTERRUPT or FFA_SUCCESS response to the Direct
// Request sent above. This will have to be considered
// for other Direct Request calls which are not atomic
// We therefore check only for Direct Response by the
// callee.
if (GetMemoryPermissionsSvcArgs.Arg0 !=
ARM_SVC_ID_FFA_MSG_SEND_DIRECT_RESP_AARCH64) {
// If Arg0 is not a Direct Response, that means we
// have an FF-A error. We need to check Arg2 for the
// FF-A error code.
Ret = GetMemoryPermissionsSvcArgs.Arg2;
switch (Ret) {
case ARM_FFA_SPM_RET_INVALID_PARAMETERS:
return EFI_INVALID_PARAMETER;
case ARM_FFA_SPM_RET_DENIED:
return EFI_NOT_READY;
case ARM_FFA_SPM_RET_NOT_SUPPORTED:
return EFI_UNSUPPORTED;
case ARM_FFA_SPM_RET_BUSY:
return EFI_NOT_READY;
case ARM_FFA_SPM_RET_ABORTED:
return EFI_ABORTED;
}
} else if (GetMemoryPermissionsSvcArgs.Arg0 ==
ARM_SVC_ID_FFA_MSG_SEND_DIRECT_RESP_AARCH64) {
// A Direct Response means FF-A success
// Now check the payload for errors
// The callee sends back the return value
// in Arg3
Ret = GetMemoryPermissionsSvcArgs.Arg3;
}
} else {
Ret = GetMemoryPermissionsSvcArgs.Arg0;
}
if (Ret & BIT31) {
// Bit 31 set means there is an error retured
switch (Ret) {
case ARM_SVC_SPM_RET_INVALID_PARAMS:
return EFI_INVALID_PARAMETER;
case ARM_SVC_SPM_RET_NOT_SUPPORTED:
return EFI_UNSUPPORTED;
}
} else {
*MemoryAttributes = Ret;
}
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
RequestMemoryPermissionChange (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length,
IN UINTN Permissions
)
{
INT32 Ret;
BOOLEAN FfaEnabled;
ARM_SVC_ARGS ChangeMemoryPermissionsSvcArgs;
ZeroMem (&ChangeMemoryPermissionsSvcArgs, sizeof (ARM_SVC_ARGS));
FfaEnabled = FeaturePcdGet (PcdFfaEnable);
if (FfaEnabled) {
ChangeMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ_AARCH64;
ChangeMemoryPermissionsSvcArgs.Arg1 = ARM_FFA_DESTINATION_ENDPOINT_ID;
ChangeMemoryPermissionsSvcArgs.Arg2 = 0;
ChangeMemoryPermissionsSvcArgs.Arg3 = ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES_AARCH64;
ChangeMemoryPermissionsSvcArgs.Arg4 = BaseAddress;
ChangeMemoryPermissionsSvcArgs.Arg5 = EFI_SIZE_TO_PAGES (Length);
ChangeMemoryPermissionsSvcArgs.Arg6 = Permissions;
} else {
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);
if (FfaEnabled) {
// Setting memory attributes is an atomic call, with
// StandaloneMm at S-EL0 being the caller and the SPM
// core being the callee. Thus there won't be a
// FFA_INTERRUPT or FFA_SUCCESS response to the Direct
// Request sent above. This will have to be considered
// for other Direct Request calls which are not atomic
// We therefore check only for Direct Response by the
// callee.
if (ChangeMemoryPermissionsSvcArgs.Arg0 !=
ARM_SVC_ID_FFA_MSG_SEND_DIRECT_RESP_AARCH64) {
// If Arg0 is not a Direct Response, that means we
// have an FF-A error. We need to check Arg2 for the
// FF-A error code.
Ret = ChangeMemoryPermissionsSvcArgs.Arg2;
switch (Ret) {
case ARM_FFA_SPM_RET_INVALID_PARAMETERS:
return EFI_INVALID_PARAMETER;
case ARM_FFA_SPM_RET_DENIED:
return EFI_NOT_READY;
case ARM_FFA_SPM_RET_NOT_SUPPORTED:
return EFI_UNSUPPORTED;
case ARM_FFA_SPM_RET_BUSY:
return EFI_NOT_READY;
case ARM_FFA_SPM_RET_ABORTED:
return EFI_ABORTED;
}
} else if (ChangeMemoryPermissionsSvcArgs.Arg0 ==
ARM_SVC_ID_FFA_MSG_SEND_DIRECT_RESP_AARCH64) {
// A Direct Response means FF-A success
// Now check the payload for errors
// The callee sends back the return value
// in Arg3
Ret = ChangeMemoryPermissionsSvcArgs.Arg3;
}
} else {
Ret = ChangeMemoryPermissionsSvcArgs.Arg0;
}
switch (Ret) {
case ARM_SVC_SPM_RET_NOT_SUPPORTED:
return EFI_UNSUPPORTED;
case ARM_SVC_SPM_RET_INVALID_PARAMS:
return EFI_INVALID_PARAMETER;
case ARM_SVC_SPM_RET_DENIED:
return EFI_ACCESS_DENIED;
case ARM_SVC_SPM_RET_NO_MEMORY:
return EFI_BAD_BUFFER_SIZE;
}
return EFI_SUCCESS;
}
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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