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authorSami Mujawar <sami.mujawar@arm.com>2023-09-22 15:35:16 +0100
committermergify[bot] <37929162+mergify[bot]@users.noreply.github.com>2023-10-30 12:16:56 +0000
commita671a14e63fdaa9490e5c61cf11346416f1d1463 (patch)
treef367f44e70152b4ca60f2f11bfd117c329f3b137 /ArmPkg
parent08431081a3623bd6c44de5c859ef42c579de63d1 (diff)
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ArmPkg/ArmLib: Add ArmHasEte () helper function
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. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Leif Lindholm <quic_llindhol@quicinc.com> Cc: Pierre Gondois <pierre.gondois@arm.com> Signed-off-by: Sami Mujawar <sami.mujawar@arm.com> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com> Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Diffstat (limited to 'ArmPkg')
-rw-r--r--ArmPkg/Include/Chipset/AArch64.h3
-rw-r--r--ArmPkg/Include/Library/ArmLib.h12
-rw-r--r--ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c16
3 files changed, 30 insertions, 1 deletions
diff --git a/ArmPkg/Include/Chipset/AArch64.h b/ArmPkg/Include/Chipset/AArch64.h
index d8711ad711..5390bf0a27 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 c2d738c06e..6aa8a48f07 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 3a46f360ef..8728546587 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);
+}