Revision: 18758
http://sourceforge.net/p/edk2/code/18758
Author: abiesheuvel
Date: 2015-11-09 13:28:17 +0000 (Mon, 09 Nov 2015)
Log Message:
-----------
ArmPkg/ArmLib: add accessor function for Cache Writeback Granule
Add a function to ArmLib that provides access to the Cache Writeback
Granule (CWG) field in CTR_EL0. This information is required when
performing non-coherent DMA.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Mark Rutland <[email protected]>
Reviewed-by: Leif Lindholm <[email protected]>
Modified Paths:
--------------
trunk/edk2/ArmPkg/Include/Library/ArmLib.h
trunk/edk2/ArmPkg/Library/ArmLib/Common/ArmLib.c
Modified: trunk/edk2/ArmPkg/Include/Library/ArmLib.h
===================================================================
--- trunk/edk2/ArmPkg/Include/Library/ArmLib.h 2015-11-09 13:27:56 UTC (rev
18757)
+++ trunk/edk2/ArmPkg/Include/Library/ArmLib.h 2015-11-09 13:28:17 UTC (rev
18758)
@@ -116,6 +116,12 @@
UINTN
EFIAPI
+ArmCacheWritebackGranule (
+ VOID
+ );
+
+UINTN
+EFIAPI
ArmIsArchTimerImplemented (
VOID
);
Modified: trunk/edk2/ArmPkg/Library/ArmLib/Common/ArmLib.c
===================================================================
--- trunk/edk2/ArmPkg/Library/ArmLib/Common/ArmLib.c 2015-11-09 13:27:56 UTC
(rev 18757)
+++ trunk/edk2/ArmPkg/Library/ArmLib/Common/ArmLib.c 2015-11-09 13:28:17 UTC
(rev 18758)
@@ -88,3 +88,20 @@
{
return 4 << (ArmCacheInfo () & 0xf); // CTR_EL0.IminLine
}
+
+UINTN
+EFIAPI
+ArmCacheWritebackGranule (
+ VOID
+ )
+{
+ UINTN CWG;
+
+ CWG = (ArmCacheInfo () >> 24) & 0xf; // CTR_EL0.CWG
+
+ if (CWG == 0) {
+ return SIZE_2KB;
+ }
+
+ return 4 << CWG;
+}
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