Hi Rebecca,
Please add doxygen style function documentation for ArmReadIdMmfr4().
With that added:
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Regards,
Sami Mujawar
-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Rebecca Cran via groups.io
Sent: 07 December 2020 05:54 PM
To: devel@edk2.groups.io
Cc: Rebecca Cran <rebecca@nuviainc.com>; Michael D Kinney <michael.d.kinney@intel.com>; Liming Gao <gaoliming@byosoft.com.cn>; Zhiguang Liu <zhiguang.liu@intel.com>; Leif Lindholm <leif@nuviainc.com>; Ard Biesheuvel <Ard.Biesheuvel@arm.com>
Subject: [edk2-devel] [PATCH v4 05/10] ArmPkg: Add helper function to read the Memory Model Feature Register 4
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@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
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