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| author | Sami Mujawar <sami.mujawar@arm.com> | 2023-09-22 15:35:16 +0100 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2023-10-30 12:16:56 +0000 |
| commit | a671a14e63fdaa9490e5c61cf11346416f1d1463 (patch) | |
| tree | f367f44e70152b4ca60f2f11bfd117c329f3b137 /ArmPkg/Library | |
| parent | 08431081a3623bd6c44de5c859ef42c579de63d1 (diff) | |
| download | edk2-a671a14e63fdaa9490e5c61cf11346416f1d1463.tar.gz edk2-a671a14e63fdaa9490e5c61cf11346416f1d1463.tar.bz2 edk2-a671a14e63fdaa9490e5c61cf11346416f1d1463.zip | |
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/Library')
| -rw-r--r-- | ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 16 |
1 files changed, 16 insertions, 0 deletions
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);
+}
|