From b69566afae852a947f0df344f7751b92d5d0994b Mon Sep 17 00:00:00 2001 From: Rebecca Cran Date: Sun, 7 Feb 2021 17:52:37 -0700 Subject: 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 Reviewed-by: Leif Lindholm Reviewed-by: Sami Mujawar --- ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h | 11 +++++++++++ ArmPkg/Library/ArmLib/AArch64/AArch64Support.S | 3 +++ 2 files changed, 14 insertions(+) (limited to 'ArmPkg/Library/ArmLib') 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 -- cgit v1.2.3