[PATCH v5 1/2] ArmLib: add functions to read system registers

["Marcin Juszkiewicz" <marcin.juszkiewicz@linaro.org>]

ArmCpuInfo uses those to read system registers and other parts of EDK2
may find them useful.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h    | 48 +++++++++++++++++++
 .../Library/ArmLib/AArch64/AArch64Support.S   | 32 +++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
index 330481fc50db..d9744a66cdcf 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
@@ -44,6 +44,54 @@ ArmReadIdAA64Pfr0 (
   VOID
   );
 
+UINTN
+EFIAPI
+ArmReadIdAA64Pfr1 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Dfr0 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Dfr1 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Isar0 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Isar1 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Isar2 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Mmfr0 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Mmfr1 (
+  VOID
+  );
+
 /** Reads the ID_AA64MMFR2_EL1 register.
 
    @return The contents of the ID_AA64MMFR2_EL1 register.
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
index d3cc1e86716b..3e8d461bc819 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
@@ -482,4 +482,36 @@ ASM_FUNC(ArmWriteCntHctl)
   msr   cnthctl_el2, x0
   ret
 
+ASM_FUNC(ArmReadIdAA64Pfr1)
+  mrs   x0, ID_AA64PFR1_EL1
+  ret
+
+ASM_FUNC(ArmReadIdAA64Dfr0)
+  mrs   x0, ID_AA64DFR0_EL1
+  ret
+
+ASM_FUNC(ArmReadIdAA64Dfr1)
+  mrs   x0, ID_AA64DFR1_EL1
+  ret
+
+ASM_FUNC(ArmReadIdAA64Isar0)
+  mrs   x0, ID_AA64ISAR0_EL1
+  ret
+
+ASM_FUNC(ArmReadIdAA64Isar1)
+  mrs   x0, ID_AA64ISAR1_EL1
+  ret
+
+ASM_FUNC(ArmReadIdAA64Isar2)
+  mrs   x0, ID_AA64ISAR2_EL1
+  ret
+
+ASM_FUNC(ArmReadIdAA64Mmfr0)
+  mrs   x0, ID_AA64MMFR0_EL1
+  ret
+
+ASM_FUNC(ArmReadIdAA64Mmfr1)
+  mrs   x0, ID_AA64MMFR1_EL1
+  ret
+
 ASM_FUNCTION_REMOVE_IF_UNREFERENCED
-- 
2.40.0