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f7e1bb53e4
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
80 lines
1.9 KiB
ArmAsm
80 lines
1.9 KiB
ArmAsm
/* startup.S - Startup code for the PowerPC. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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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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.extern __bss_start
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.extern _end
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.text
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.align 2
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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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/* 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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li 2, 0
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li 13, 0
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/* Stage1 won't zero BSS for us. In other cases, why not do it again? */
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lis 6, (__bss_start - 4)@h
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ori 6, 6, (__bss_start - 4)@l
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2: stb 2, 4(6)
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addi 6, 6, 1
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andi. 7, 6, 3
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cmpi 0, 1, 7, 0
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bne 2b
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lis 7, (_end - 4)@h
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ori 7, 7, (_end - 4)@l
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subf 7, 6, 7
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subi 8, 7, 1
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andi. 8, 8, 3
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addi 8, 8, 1
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sub 7, 7, 8
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srwi 7, 7, 2 /* We store 4 bytes at a time. */
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mtctr 7
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2: stwu 2, 4(6) /* We know r2 is already 0 from above. */
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bdnz 2b
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mtctr 8
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2: stb 2, 4(6) /* We know r2 is already 0 from above. */
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addi 6, 6, 1
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bdnz 2b
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/* Store r5 in grub_ieee1275_entry_fn. */
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lis 9, grub_ieee1275_entry_fn@ha
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stw 5, grub_ieee1275_entry_fn@l(9)
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bl grub_main
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1: b 1b
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