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ArmPkg: Correct return value of "SMCCC_ARCH_SOC_ID" Function ID call 

According to "SMC Calling Convention" specification, section 7.4,
return value of Arm Architecture Calls is stored at first argument of
SMC aguments (ARM_SMC_ARGS). This value can be negative values indicating
error or positive values (including zero) indicating success. Positive
value would contain information of respective Function ID (Section 7.3.4
and 7.4.4).

For that reason, "SMCCC_VERSION" and "SMCCC_ARCH_FEATURES"
Function ID calls read return value from "SmcCallStatus" variable
(Args.Arg0 - first argument of SMC call). But "SMCCC_ARCH_SOC_ID"
Function ID call is reading return value from "SmcParam" variable
(Args.Arg1 - second argument of SMC call) so it leads to unexpected
results of "Jep106Code" and "SocRevision". This patch is to correct it.

Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
Reviewed-by: Rebecca Cran <rebecca@quicinc.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
This commit is contained in:
Minh Nguyen 2022-09-19 09:19:46 +07:00 committed by mergify[bot]
parent 8467a263f9
commit 11b5093ce4
1 changed files with 3 additions and 3 deletions
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6
ArmPkg/Universal/Smbios/ProcessorSubClassDxe/SmbiosProcessorArmCommon.c
View File

@ -2,7 +2,7 @@
Functions for processor information common to ARM and AARCH64.
Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
Copyright (c) 2021, Ampere Computing LLC. All rights reserved.<BR>
Copyright (c) 2021 - 2022, Ampere Computing LLC. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@ -131,7 +131,7 @@ SmbiosGetSmcArm64SocId (
SmcCallStatus = ArmCallSmc1 (SMCCC_ARCH_SOC_ID, &SmcParam, NULL, NULL);
if (SmcCallStatus >= 0) {
*Jep106Code = (INT32)SmcParam;
*Jep106Code = SmcCallStatus;
} else {
Status = EFI_UNSUPPORTED;
}
@ -140,7 +140,7 @@ SmbiosGetSmcArm64SocId (
SmcCallStatus = ArmCallSmc1 (SMCCC_ARCH_SOC_ID, &SmcParam, NULL, NULL);
if (SmcCallStatus >= 0) {
*SocRevision = (INT32)SmcParam;
*SocRevision = SmcCallStatus;
} else {
Status = EFI_UNSUPPORTED;
}