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[Xen-devel,v2,10/17] xen: arm64: disable alignment traps

Message ID 1395841133-2223-10-git-send-email-ian.campbell@citrix.com
State Accepted
Commit 58bbe7d71239db508c30099bf7b6db7c458f3336
Headers show

Commit Message

Ian Campbell March 26, 2014, 1:38 p.m. UTC 
The mem* primitives which I am about to import from Linux in a subsequent
patch rely on the hardware handling misalignment.

The benefits of an optimised memcpy etc outweigh the downsides.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
---
v2: fix typo in commit message and correct comment which refers to alignment
trapping status.
---
 xen/arch/arm/arm64/head.S |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index 9547ef5..d3e773d 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -239,9 +239,9 @@  skip_bss:
          * Write-implies-XN disabled (for now),
          * D-cache disabled (for now),
          * I-cache enabled,
-         * Alignment checking enabled,
+         * Alignment checking disabled,
          * MMU translation disabled (for now). */
-        ldr   x0, =(HSCTLR_BASE|SCTLR_A)
+        ldr   x0, =(HSCTLR_BASE)
         msr   SCTLR_EL2, x0
 
         /* Rebuild the boot pagetable's first-level entries. The structure