Revision: 18570
http://sourceforge.net/p/edk2/code/18570
Author: abiesheuvel
Date: 2015-10-06 12:51:07 +0000 (Tue, 06 Oct 2015)
Log Message:
-----------
ArmPkg/AArch64Mmu: remove cache maintenance for page tables
All our page tables are allocated from memory whose cacheability
attributes are inherited by the cacheability bits in the MMU control
register, so there is no need for explicit cache maintenance after
updating the page tables. And even if there were, Set/Way operations
are not appropriate anyway for ensuring that these changes make it to
main memory. So just remove the explicit cache maintenance completely.
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/AArch64/AArch64Mmu.c
Modified: trunk/edk2/ArmPkg/Library/ArmLib/AArch64/AArch64Mmu.c
===================================================================
--- trunk/edk2/ArmPkg/Library/ArmLib/AArch64/AArch64Mmu.c 2015-10-02
14:48:30 UTC (rev 18569)
+++ trunk/edk2/ArmPkg/Library/ArmLib/AArch64/AArch64Mmu.c 2015-10-06
12:51:07 UTC (rev 18570)
@@ -493,12 +493,6 @@
return Status;
}
- // Flush d-cache so descriptors make it back to uncached memory for
subsequent table walks
- // flush and invalidate pages
- ArmCleanInvalidateDataCache ();
-
- ArmInvalidateInstructionCache ();
-
// Invalidate all TLB entries so changes are synced
ArmInvalidateTlb ();
------------------------------------------------------------------------------
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