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Disable VSX instruction

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VSX bit is enabled by default for Power7 and Power8 CPU models,
so we need to disable them in order to avoid instruction exceptions.
Kernel will activate it when necessary.

* grub-core/kern/powerpc/ieee1275/startup.S: Disable VSX.

Also-By: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Also-By: Colin Watson <cjwatson@debian.org>

Origin: other, https://lists.gnu.org/archive/html/grub-devel/2014-09/msg00078.html
Last-Update: 2015-01-27

Patch-Name: ppc64el-disable-vsx.patch
This commit is contained in:
Paulo Flabiano Smorigo 2014-09-25 19:33:39 -03:00 committed by Colin Watson
parent 863a52dd1c
commit 8d95d2b9ba
1 changed files with 12 additions and 0 deletions
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12
grub-core/kern/powerpc/ieee1275/startup.S
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@ -20,6 +20,8 @@
#include <grub/symbol.h>
#include <grub/offsets.h>
#define MSR_VSX 0x80
.extern __bss_start
.extern _end
@ -28,6 +30,16 @@
.globl start, _start
start:
_start:
_start:
/* Disable VSX instruction */
mfmsr 0
oris 0,0,MSR_VSX
/* The "VSX Available" bit is in the lower half of the MSR, so we
don't need mtmsrd, which in any case won't work in 32-bit mode. */
mtmsr 0
isync
li 2, 0
li 13, 0