[edk2-devel] [PATCH v1 06/12] StandaloneMmPkg: Add option to use FF-A calls for getting SPM version
Sami Mujawar
sami.mujawar at arm.com
Mon Nov 23 10:10:14 UTC 2020
Hi Sughosh,
Please find my response inline marked [SAMI].
Regards,
Sami Mujawar
-----Original Message-----
From: Sughosh Ganu <sughosh.ganu at linaro.org>
Sent: 21 October 2020 12:32 PM
To: devel at edk2.groups.io
Cc: Ard Biesheuvel <Ard.Biesheuvel at arm.com>; Sami Mujawar <Sami.Mujawar at arm.com>; Jiewen Yao <jiewen.yao at intel.com>; Achin Gupta <Achin.Gupta at arm.com>
Subject: [PATCH v1 06/12] StandaloneMmPkg: Add option to use FF-A calls for getting SPM version
From: Achin Gupta <achin.gupta at arm.com>
With the introduction of Firmware Framework(FF-A), a Secure Partition
can get the SPM version either using FF-A calls or through the
existing svc calls. Use a runtime check to use either of the two
methods based on the Pcd feature flag value.
Signed-off-by: Achin Gupta <achin.gupta at arm.com>
Co-developed-by: Sughosh Ganu <sughosh.ganu at linaro.org>
---
StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf | 3 ++
StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c | 31 ++++++++++++++------
2 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf
index 7d6ee4e08e..f8184f501b 100644
--- a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf
+++ b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf
@@ -49,5 +49,8 @@
gEfiStandaloneMmNonSecureBufferGuid
gEfiArmTfCpuDriverEpDescriptorGuid
+[Pcd]
+ gArmTokenSpaceGuid.PcdFfaEnable
+
[BuildOptions]
GCC:*_*_*_CC_FLAGS = -fpie
diff --git a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c
index 33f0db654f..7d1e3c4d7c 100644
--- a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c
+++ b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c
@@ -23,6 +23,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/SerialPortLib.h>
+#include <Library/PcdLib.h>
#include <IndustryStandard/ArmStdSmc.h>
#include <IndustryStandard/ArmMmSvc.h>
@@ -165,19 +166,31 @@ EFI_STATUS
GetSpmVersion (VOID)
{
EFI_STATUS Status;
- UINT16 SpmMajorVersion;
- UINT16 SpmMinorVersion;
+ UINT16 CurSpmMajorVer;
+ UINT16 SpmMajorVer;
[SAMI] I think a 'Caller & Callee' prefix would add clarity. See FFA Spec, Section 8.1.1 [/SAMI]
+ UINT16 CurSpmMinorVer;
+ UINT16 SpmMinorVer;
UINT32 SpmVersion;
ARM_SVC_ARGS SpmVersionArgs;
- SpmVersionArgs.Arg0 = ARM_SVC_ID_SPM_VERSION_AARCH32;
+ if (FeaturePcdGet (PcdFfaEnable)) {
+ SpmVersionArgs.Arg0 = ARM_SVC_ID_FFA_VERSION_AARCH32;
+ SpmVersionArgs.Arg1 = SPM_MAJOR_VER << SPM_MAJOR_VER_SHIFT;
+ SpmVersionArgs.Arg1 |= SPM_MINOR_VER;
+ SpmMajorVer = SPM_MAJOR_VER_FFA;
+ SpmMinorVer = SPM_MINOR_VER_FFA;
+ } else {
+ SpmVersionArgs.Arg0 = ARM_SVC_ID_SPM_VERSION_AARCH32;
+ SpmMajorVer = SPM_MAJOR_VER;
+ SpmMinorVer = SPM_MINOR_VER;
+ }
ArmCallSvc (&SpmVersionArgs);
SpmVersion = SpmVersionArgs.Arg0;
[SAMI] The Version FID for FFA and for SPM based on the MM interface both return NOT_SUPPORTED as an error code.
Can we check the error code for failure, please?
[/SAMI]
- SpmMajorVersion = ((SpmVersion & SPM_MAJOR_VER_MASK) >> SPM_MAJOR_VER_SHIFT);
- SpmMinorVersion = ((SpmVersion & SPM_MINOR_VER_MASK) >> 0);
+ CurSpmMajorVer = ((SpmVersion & SPM_MAJOR_VER_MASK) >> SPM_MAJOR_VER_SHIFT);
+ CurSpmMinorVer = ((SpmVersion & SPM_MINOR_VER_MASK) >> 0);
// Different major revision values indicate possibly incompatible functions.
// For two revisions, A and B, for which the major revision values are
@@ -186,17 +199,17 @@ GetSpmVersion (VOID)
// revision A must work in a compatible way with revision B.
// However, it is possible for revision B to have a higher
// function count than revision A.
- if ((SpmMajorVersion == SPM_MAJOR_VER) &&
- (SpmMinorVersion >= SPM_MINOR_VER))
+ if ((CurSpmMajorVer == SpmMajorVer) &&
+ (CurSpmMinorVer >= SpmMinorVer))
{
DEBUG ((DEBUG_INFO, "SPM Version: Major=0x%x, Minor=0x%x\n",
- SpmMajorVersion, SpmMinorVersion));
+ CurSpmMajorVer, CurSpmMinorVer));
Status = EFI_SUCCESS;
}
else
{
DEBUG ((DEBUG_INFO, "Incompatible SPM Versions.\n Current Version: Major=0x%x, Minor=0x%x.\n Expected: Major=0x%x, Minor>=0x%x.\n",
- SpmMajorVersion, SpmMinorVersion, SPM_MAJOR_VER, SPM_MINOR_VER));
+ CurSpmMajorVer, CurSpmMinorVer, SpmMajorVer, SpmMinorVer));
Status = EFI_UNSUPPORTED;
}
--
2.17.1
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