[edk2-devel] [PATCH v4 05/10] ArmPkg: Add helper function to read the Memory Model Feature Register 4
Rebecca Cran
rebecca at nuviainc.com
Mon Dec 7 17:54:22 UTC 2020
In AARCH32, CCIDX support is indicated in the MMFR4 register - unlike
under AARCH64 where it's in MMFR2. Add a helper function to read it.
Signed-off-by: Rebecca Cran <rebecca at nuviainc.com>
---
ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h | 6 ++++++
ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S | 4 ++++
ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm | 4 ++++
3 files changed, 14 insertions(+)
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h
index 93183e67230e..3b331a3b2088 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h
+++ b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h
@@ -48,5 +48,11 @@ ArmCleanInvalidateDataCacheEntryBySetWay (
IN UINTN SetWayFormat
);
+UINT32
+EFIAPI
+ArmReadIdMmfr4 (
+ VOID
+ );
+
#endif // __ARM_V7_LIB_H__
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S b/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S
index 01c91b10fcb7..a60a2f634132 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S
@@ -60,6 +60,10 @@ ASM_FUNC(ArmDisableInterrupts)
isb
bx LR
+ASM_FUNC(ArmReadIdMmfr4)
+ mrc p15,0,r0,c0,c2,6 @ Read ID_MMFR4 Register
+ bx lr
+
// UINT32
// ReadCCSIDR (
// IN UINT32 CSSELR
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm b/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm
index 26ffa331b929..1679b09b797a 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm
@@ -64,6 +64,10 @@
isb
bx LR
+ RVCT_ASM_EXPORT ArmReadIdMmfr4
+ mrc p15,0,r0,c0,c2,6 ; Read ID_MMFR4 Register
+ bx LR
+
// UINT32
// ReadCCSIDR (
// IN UINT32 CSSELR
--
2.26.2
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#68391): https://edk2.groups.io/g/devel/message/68391
Mute This Topic: https://groups.io/mt/78784067/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-
More information about the edk2-devel-archive
mailing list