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| author | Rebecca Cran <rebecca@nuviainc.com> | 2021-02-07 17:52:37 -0700 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2021-02-08 19:35:23 +0000 |
| commit | b69566afae852a947f0df344f7751b92d5d0994b (patch) | |
| tree | 4ff17fd9f106dfa297955c01eb1f3e4d07b2be03 /ArmPkg/Library | |
| parent | 92bdb2a9c65f57621ad48f9a91326f36fcf2c6f7 (diff) | |
| download | edk2-b69566afae852a947f0df344f7751b92d5d0994b.tar.gz edk2-b69566afae852a947f0df344f7751b92d5d0994b.tar.bz2 edk2-b69566afae852a947f0df344f7751b92d5d0994b.zip | |
ArmPkg: Add helper to read the Memory Model Features Register 2
Add helper function to read the MMFR2 register. We will need this to
determine CCIDX support.
Signed-off-by: Rebecca Cran <rebecca@nuviainc.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Diffstat (limited to 'ArmPkg/Library')
| -rw-r--r-- | ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h | 11 | ||||
| -rw-r--r-- | ArmPkg/Library/ArmLib/AArch64/AArch64Support.S | 3 |
2 files changed, 14 insertions, 0 deletions
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h index 85bcecda73..cfc0c878a4 100644 --- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h +++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h @@ -41,5 +41,16 @@ EFIAPI ArmReadIdAA64Pfr0 (
VOID
);
+
+/** Reads the ID_AA64MMFR2_EL1 register.
+
+ @return The contents of the ID_AA64MMFR2_EL1 register.
+**/
+UINTN
+EFIAPI
+ArmReadIdAA64Mmfr2 (
+ VOID
+ );
+
#endif // __AARCH64_LIB_H__
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S index 129205d2ac..d3cc1e8671 100644 --- a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S +++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S @@ -425,6 +425,9 @@ ASM_FUNC(ArmCallWFI) wfi
ret
+ASM_FUNC(ArmReadIdAA64Mmfr2)
+ mrs x0, ID_AA64MMFR2_EL1 // read EL1 MMFR2
+ ret
ASM_FUNC(ArmReadMpidr)
mrs x0, mpidr_el1 // read EL1 MPIDR
|