Revision: 18894
http://sourceforge.net/p/edk2/code/18894
Author: abiesheuvel
Date: 2015-11-18 15:58:26 +0000 (Wed, 18 Nov 2015)
Log Message:
-----------
ArmPkg/ArmV7Lib: add support for reading the ID_MMFR0 system register
Implement an accessor function for the ID_MMFR0 system register, which
contains information about the VMSA implementation. We will need this
to access the number of shareability levels and the nature of their
implementations.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Leif Lindholm <[email protected]>
Modified Paths:
--------------
trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h
trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.S
trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.asm
Modified: trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h
===================================================================
--- trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h 2015-11-18 15:58:03 UTC
(rev 18893)
+++ trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h 2015-11-18 15:58:26 UTC
(rev 18894)
@@ -22,5 +22,11 @@
IN ARM_V7_CACHE_OPERATION DataCacheOperation
);
+UINTN
+EFIAPI
+ArmReadIdMmfr0 (
+ VOID
+ );
+
#endif // __ARM_V7_LIB_H__
Modified: trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.S
===================================================================
--- trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.S 2015-11-18
15:58:03 UTC (rev 18893)
+++ trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.S 2015-11-18
15:58:26 UTC (rev 18894)
@@ -51,6 +51,7 @@
GCC_ASM_EXPORT (ArmWriteTpidrurw)
GCC_ASM_EXPORT (ArmIsArchTimerImplemented)
GCC_ASM_EXPORT (ArmReadIdPfr1)
+GCC_ASM_EXPORT (ArmReadIdMmfr0)
.set DC_ON, (0x1<<2)
.set IC_ON, (0x1<<12)
@@ -326,4 +327,8 @@
mrc p15, 0, r0, c0, c1, 1 @ Read ID_PFR1 Register
bx lr
+ASM_PFX(ArmReadIdMmfr0):
+ mrc p15, 0, r0, c0, c1, 4 @ Read ID_MMFR0 Register
+ bx lr
+
ASM_FUNCTION_REMOVE_IF_UNREFERENCED
Modified: trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.asm
===================================================================
--- trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.asm 2015-11-18
15:58:03 UTC (rev 18893)
+++ trunk/edk2/ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.asm 2015-11-18
15:58:26 UTC (rev 18894)
@@ -48,6 +48,7 @@
EXPORT ArmWriteTpidrurw
EXPORT ArmIsArchTimerImplemented
EXPORT ArmReadIdPfr1
+ EXPORT ArmReadIdMmfr0
AREA ArmV7Support, CODE, READONLY
PRESERVE8
@@ -320,4 +321,8 @@
mrc p15, 0, r0, c0, c1, 1 ; Read ID_PFR1 Register
bx lr
+ArmReadIdMmfr0
+ mrc p15, 0, r0, c0, c1, 4 ; Read ID_MMFR0 Register
+ bx lr
+
END
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