Create a helper function to query whether ID_AA64MFR1_EL1 indicates
presence of the Embedded Trace Extension (ETE). 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 ETE feature is
supported.
Ref: https://edk2.groups.io/g/devel/message/10898
ArmPkg/Include/Chipset/AArch64.h | 3 ++-
ArmPkg/Include/Library/ArmLib.h | 12 ++++++++++++
ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 16 ++++++++++++++++
3 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/ArmPkg/Include/Chipset/AArch64.h b/ArmPkg/Include/Chipset/AArch64.h
index
d8711ad7112f1f983d22d98bdf8ff8607bf2ff98..5390bf0a2774fb410f33e031cb0367708905c658
100644
--- a/ArmPkg/Include/Chipset/AArch64.h
+++ b/ArmPkg/Include/Chipset/AArch64.h
@@ -32,7 +32,8 @@
#define AARCH64_PFR0_GIC (0xF << 24)
// ID_AA64DFR0 - AArch64 Debug Feature Register 0 definitions
-#define AARCH64_DFR0_TRBE (0xFULL << 44)
+#define AARCH64_DFR0_TRACEVER (0xFULL << 4)
+#define AARCH64_DFR0_TRBE (0xFULL << 44)
// SCR - Secure Configuration Register definitions
#define SCR_NS (1 << 0)
diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index
c2d738c06e27a3599b79c7bd83c72f8a696b4aef..6aa8a48f07f39255b70406774d2d803dbfc97b0b
100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -793,6 +793,18 @@ ArmHasTrbe (
VOID
);
+/**
+ Checks whether the CPU implements the Embedded Trace Extension.
+
+ @retval TRUE FEAT_ETE is implemented.
+ @retval FALSE FEAT_ETE is not mplemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasEte (
+ 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
3a46f360ef512ed68f9ec80fc486551ff7440009..87285465871dc100ea0065659959ca845912c549
100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
@@ -134,3 +134,19 @@ ArmHasTrbe (
{
return ((ArmReadIdAA64Dfr0 () & AARCH64_DFR0_TRBE) != 0);
}
+
+/**
+ Checks whether the CPU implements the Embedded Trace Extension.
+
+ @retval TRUE FEAT_ETE is implemented.
+ @retval FALSE FEAT_ETE is not mplemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasEte (
+ VOID
+ )
+{
+ // The ID_AA64DFR0_EL1.TraceVer field identifies the presence of FEAT_ETE.
+ return ((ArmReadIdAA64Dfr0 () & AARCH64_DFR0_TRACEVER) != 0);
+}
--
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'
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