From 7fdfd21bfaec8d01638942704949a651c73c2f41 Mon Sep 17 00:00:00 2001 From: Paulo Flabiano Smorigo Date: Thu, 25 Sep 2014 19:33:39 -0300 Subject: Disable VSX instruction 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 Also-By: Colin Watson 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 --- grub-core/kern/powerpc/ieee1275/startup.S | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/grub-core/kern/powerpc/ieee1275/startup.S b/grub-core/kern/powerpc/ieee1275/startup.S index 21c884b..de9a960 100644 --- a/grub-core/kern/powerpc/ieee1275/startup.S +++ b/grub-core/kern/powerpc/ieee1275/startup.S @@ -20,6 +20,8 @@ #include #include +#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