53 lines
1.4 KiB
Diff
53 lines
1.4 KiB
Diff
From efc381a55124b12fc74ed8117283f11367c9372a Mon Sep 17 00:00:00 2001
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From: Paulo Flabiano Smorigo <pfsmorigo@linux.vnet.ibm.com>
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Date: Thu, 25 Sep 2014 19:33:39 -0300
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Subject: Disable VSX instruction
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VSX bit is enabled by default for Power7 and Power8 CPU models,
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so we need to disable them in order to avoid instruction exceptions.
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Kernel will activate it when necessary.
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* grub-core/kern/powerpc/ieee1275/startup.S: Disable VSX.
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Also-By: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
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Also-By: Colin Watson <cjwatson@debian.org>
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Origin: other, https://lists.gnu.org/archive/html/grub-devel/2014-09/msg00078.html
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Last-Update: 2015-01-27
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Patch-Name: ppc64el-disable-vsx.patch
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---
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grub-core/kern/powerpc/ieee1275/startup.S | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/grub-core/kern/powerpc/ieee1275/startup.S b/grub-core/kern/powerpc/ieee1275/startup.S
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index 21c884b43..de9a9601a 100644
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--- grub-core/kern/powerpc/ieee1275/startup.S
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+++ grub-core/kern/powerpc/ieee1275/startup.S
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@@ -20,6 +20,8 @@
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#include <grub/symbol.h>
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#include <grub/offsets.h>
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+#define MSR_VSX 0x80
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+
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.extern __bss_start
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.extern _end
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@@ -28,6 +30,16 @@
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.globl start, _start
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start:
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_start:
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+ _start:
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+
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+ /* Disable VSX instruction */
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+ mfmsr 0
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+ oris 0,0,MSR_VSX
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+ /* The "VSX Available" bit is in the lower half of the MSR, so we
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+ don't need mtmsrd, which in any case won't work in 32-bit mode. */
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+ mtmsr 0
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+ isync
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+
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li 2, 0
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li 13, 0
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