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/* startup.S - Startup code for the PowerPC. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2004,2005,2007,2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/symbol.h>
#include <grub/offsets.h>
#define MSR_VSX 0x80
.extern __bss_start
.extern _end
.text
.align 2
.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
/* Stage1 won't zero BSS for us. In other cases, why not do it again? */
lis 6, (__bss_start - 4)@h
ori 6, 6, (__bss_start - 4)@l
2: stb 2, 4(6)
addi 6, 6, 1
andi. 7, 6, 3
cmpi 0, 1, 7, 0
bne 2b
lis 7, (_end - 4)@h
ori 7, 7, (_end - 4)@l
subf 7, 6, 7
subi 8, 7, 1
andi. 8, 8, 3
addi 8, 8, 1
sub 7, 7, 8
srwi 7, 7, 2 /* We store 4 bytes at a time. */
mtctr 7
2: stwu 2, 4(6) /* We know r2 is already 0 from above. */
bdnz 2b
mtctr 8
2: stb 2, 4(6) /* We know r2 is already 0 from above. */
addi 6, 6, 1
bdnz 2b
/* Store r5 in grub_ieee1275_entry_fn. */
lis 9, grub_ieee1275_entry_fn@ha
stw 5, grub_ieee1275_entry_fn@l(9)
bl grub_main
1: b 1b
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