67 lines
1.6 KiB
ArmAsm
67 lines
1.6 KiB
ArmAsm
/* 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>
|
|
|
|
.extern __bss_start
|
|
.extern _end
|
|
|
|
.text
|
|
.align 2
|
|
.globl start, _start
|
|
start:
|
|
_start:
|
|
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
|