[edk2-devel] [PATCH 3/7] ArmPkg: add functions to read SVE/SME info
Marcin Juszkiewicz
marcin.juszkiewicz at linaro.org
Thu May 4 14:24:36 UTC 2023
ID_AA64ZFR0_EL1 and ID_AA64SMFR0_EL1 system registers are needed for
ArmCpuInfo application to show state of SVE/SME support.
Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz at linaro.org>
---
ArmPkg/Library/ArmLib/ArmBaseLib.inf | 5 +++++
ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h | 12 ++++++++++++
ArmPkg/Library/ArmLib/AArch64/AArch64Support.S | 10 ++++++++++
3 files changed, 27 insertions(+)
diff --git a/ArmPkg/Library/ArmLib/ArmBaseLib.inf b/ArmPkg/Library/ArmLib/ArmBaseLib.inf
index e37d85bee471..8b5eda337fe3 100644
--- a/ArmPkg/Library/ArmLib/ArmBaseLib.inf
+++ b/ArmPkg/Library/ArmLib/ArmBaseLib.inf
@@ -48,3 +48,8 @@ [Packages]
[FeaturePcd.ARM]
gArmTokenSpaceGuid.PcdNormalMemoryNonshareableOverride
+
+# to access ID_AA64ZFR0_EL1 and ID_AA64SMFR0_EL1 system registers
+# we need to enable SME
+[BuildOptions]
+ GCC:*_*_AARCH64_ASM_FLAGS = -march=armv8-a+sme
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
index 6380a019ddc5..2fd256f4acc8 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
@@ -102,4 +102,16 @@ ArmReadIdAA64Pfr1 (
VOID
);
+UINTN
+EFIAPI
+ArmReadIdAA64Smfr0 (
+ VOID
+ );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Zfr0 (
+ VOID
+ );
+
#endif // AARCH64_LIB_H_
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
index a7111e51882c..c996fa8dbbc3 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
@@ -524,4 +524,14 @@ ASM_FUNC(ArmReadIdAA64Pfr1)
mrs x0, ID_AA64PFR1_EL1
ret
+
+ASM_FUNC(ArmReadIdAA64Smfr0)
+ mrs x0, ID_AA64SMFR0_EL1
+ ret
+
+
+ASM_FUNC(ArmReadIdAA64Zfr0)
+ mrs x0, ID_AA64ZFR0_EL1
+ ret
+
ASM_FUNCTION_REMOVE_IF_UNREFERENCED
--
2.40.1
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