From: Achin Gupta <achin.gu...@arm.com>
Allow setting memory region's permissions using either of the Firmware
Framework(FF-A) ABI transport or through the earlier used SVC calls.
Signed-off-by: Achin Gupta <achin.gu...@arm.com>
Co-developed-by: Sughosh Ganu <sughosh.g...@linaro.org>
Reviewed-by: Sami Mujawar <sami.muja...@arm.com>
---
Changes since V3:
* Change the patch header to have the ArmPkg prefix instead of
StandaloneMmMmuLib as suggested by Sami.
ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c | 88
+++++++++++++++-----
1 file changed, 65 insertions(+), 23 deletions(-)
diff --git a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
b/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
index 14fe781630..a30369af9c 100644
--- a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
+++ b/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
@@ -116,47 +116,89 @@ RequestMemoryPermissionChange (
IN UINTN Permissions
)
{
- EFI_STATUS Status;
+ INT32 Ret;
+ BOOLEAN FfaEnabled;
ARM_SVC_ARGS ChangeMemoryPermissionsSvcArgs;
ZeroMem (&ChangeMemoryPermissionsSvcArgs, sizeof (ARM_SVC_ARGS));
- ChangeMemoryPermissionsSvcArgs.Arg0 =
ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES_AARCH64;
- ChangeMemoryPermissionsSvcArgs.Arg1 = BaseAddress;
- ChangeMemoryPermissionsSvcArgs.Arg2 = EFI_SIZE_TO_PAGES(Length);
- ChangeMemoryPermissionsSvcArgs.Arg3 = Permissions;
+ 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);
- Status = ChangeMemoryPermissionsSvcArgs.Arg0;
+ 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;
- switch (Status) {
- case ARM_SVC_SPM_RET_SUCCESS:
- Status = EFI_SUCCESS;
- break;
+ 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:
- Status = EFI_UNSUPPORTED;
- break;
+ return EFI_UNSUPPORTED;
case ARM_SVC_SPM_RET_INVALID_PARAMS:
- Status = EFI_INVALID_PARAMETER;
- break;
+ return EFI_INVALID_PARAMETER;
case ARM_SVC_SPM_RET_DENIED:
- Status = EFI_ACCESS_DENIED;
- break;
+ return EFI_ACCESS_DENIED;
case ARM_SVC_SPM_RET_NO_MEMORY:
- Status = EFI_BAD_BUFFER_SIZE;
- break;
-
- default:
- Status = EFI_ACCESS_DENIED;
- ASSERT (0);
+ return EFI_BAD_BUFFER_SIZE;
}
- return Status;
+ return EFI_SUCCESS;
}
EFI_STATUS
--
2.17.1
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