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ArmPkg: Add helper to read the Memory Model Features Register 2

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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>
This commit is contained in:
Rebecca Cran 2021-02-07 17:52:37 -07:00 committed by mergify[bot]
parent 92bdb2a9c6
commit b69566afae
2 changed files with 14 additions and 0 deletions
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11
ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
View File

@ -41,5 +41,16 @@ EFIAPI
ArmReadIdAA64Pfr0 ( ArmReadIdAA64Pfr0 (
VOID VOID
); );
/** Reads the ID_AA64MMFR2_EL1 register.
@return The contents of the ID_AA64MMFR2_EL1 register.
**/
UINTN
EFIAPI
ArmReadIdAA64Mmfr2 (
VOID
);
#endif // __AARCH64_LIB_H__ #endif // __AARCH64_LIB_H__

3
ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
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@ -425,6 +425,9 @@ ASM_FUNC(ArmCallWFI)
wfi wfi
ret ret
ASM_FUNC(ArmReadIdAA64Mmfr2)
mrs x0, ID_AA64MMFR2_EL1 // read EL1 MMFR2
ret
ASM_FUNC(ArmReadMpidr) ASM_FUNC(ArmReadMpidr)
mrs x0, mpidr_el1 // read EL1 MPIDR mrs x0, mpidr_el1 // read EL1 MPIDR