Create a helper function to query whether ID_AA64MFR1_EL1 indicates
presence of the Trace Buffer Extension (TRBE). This feature is only
visible in AARCH64 state.
Signed-off-by: Sami Mujawar <sami.muja...@arm.com>
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Leif Lindholm <quic_llind...@quicinc.com>
Cc: Pierre Gondois <pierre.gond...@arm.com>
---
Notes:
v3:
- New patch in this series that introduces a helper [SAMI]
function for platforms to query if TRBE feature is
supported.
Ref: https://edk2.groups.io/g/devel/message/108986
ArmPkg/Include/Chipset/AArch64.h | 3 +++
ArmPkg/Include/Library/ArmLib.h | 13 +++++++++++++
ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 15 +++++++++++++++
3 files changed, 31 insertions(+)
diff --git a/ArmPkg/Include/Chipset/AArch64.h b/ArmPkg/Include/Chipset/AArch64.h
index
2e87917049f9c50af9bf674a5ca32d1ae6f072c3..d8711ad7112f1f983d22d98bdf8ff8607bf2ff98
100644
--- a/ArmPkg/Include/Chipset/AArch64.h
+++ b/ArmPkg/Include/Chipset/AArch64.h
@@ -31,6 +31,9 @@
#define AARCH64_PFR0_FP (0xF << 16)
#define AARCH64_PFR0_GIC (0xF << 24)
+// ID_AA64DFR0 - AArch64 Debug Feature Register 0 definitions
+#define AARCH64_DFR0_TRBE (0xFULL << 44)
+
// SCR - Secure Configuration Register definitions
#define SCR_NS (1 << 0)
#define SCR_IRQ (1 << 1)
diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index
0169dbc1092cddae684362c07c8d5fe3d8809b91..c2d738c06e27a3599b79c7bd83c72f8a696b4aef
100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -780,6 +780,19 @@ EFIAPI
ArmHasVhe (
VOID
);
+
+/**
+ Checks whether the CPU implements the Trace Buffer Extension.
+
+ @retval TRUE FEAT_TRBE is implemented.
+ @retval FALSE FEAT_TRBE is not mplemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasTrbe (
+ VOID
+ );
+
#endif // MDE_CPU_AARCH64
#ifdef MDE_CPU_ARM
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
index
da5755106e623da92be8455af7159e66e5c48661..3a46f360ef512ed68f9ec80fc486551ff7440009
100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
@@ -119,3 +119,18 @@ ArmHasVhe (
{
return ((ArmReadIdAA64Mmfr1 () & AARCH64_MMFR1_VH) != 0);
}
+
+/**
+ Checks whether the CPU implements the Trace Buffer Extension.
+
+ @retval TRUE FEAT_TRBE is implemented.
+ @retval FALSE FEAT_TRBE is not mplemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasTrbe (
+ VOID
+ )
+{
+ return ((ArmReadIdAA64Dfr0 () & AARCH64_DFR0_TRBE) != 0);
+}
--
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'
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