diff options
| author | Achin Gupta <achin.gupta@arm.com> | 2021-02-19 12:06:04 +0530 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2021-02-23 15:40:37 +0000 |
| commit | 0e43e02b9bd84ac68d140db68e700ba7398973b6 (patch) | |
| tree | a7bc0f7049831d937f7b589cfe166e18fa7f086f /ArmPkg/Library/StandaloneMmMmuLib/AArch64 | |
| parent | 67f3f8b661d6ebdef571e70633ed6f6aee42a468 (diff) | |
| download | edk2-0e43e02b9bd84ac68d140db68e700ba7398973b6.tar.gz edk2-0e43e02b9bd84ac68d140db68e700ba7398973b6.tar.bz2 edk2-0e43e02b9bd84ac68d140db68e700ba7398973b6.zip | |
ArmPkg: Allow FF-A calls to get memory region's attributes
Allow getting 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.gupta@arm.com>
Co-developed-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'ArmPkg/Library/StandaloneMmMmuLib/AArch64')
| -rw-r--r-- | ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c | 78 |
1 files changed, 72 insertions, 6 deletions
diff --git a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c b/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c index e2770636fb..14fe781630 100644 --- a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c +++ b/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c @@ -17,6 +17,7 @@ #include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
STATIC
EFI_STATUS
@@ -25,20 +26,85 @@ GetMemoryPermissions ( OUT UINT32 *MemoryAttributes
)
{
+ INT32 Ret;
ARM_SVC_ARGS GetMemoryPermissionsSvcArgs;
+ BOOLEAN FfaEnabled;
ZeroMem (&GetMemoryPermissionsSvcArgs, sizeof (ARM_SVC_ARGS));
- GetMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES_AARCH64;
- GetMemoryPermissionsSvcArgs.Arg1 = BaseAddress;
+ 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 (GetMemoryPermissionsSvcArgs.Arg0 == ARM_SVC_SPM_RET_INVALID_PARAMS) {
- *MemoryAttributes = 0;
- return EFI_INVALID_PARAMETER;
+ 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;
}
- *MemoryAttributes = GetMemoryPermissionsSvcArgs.Arg0;
return EFI_SUCCESS;
}
|