head.S
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/*
* arch/score/kernel/head.S
*
* Score Processor version.
*
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
* Chen Liqin <liqin.chen@sunplusct.com>
* Lennox Wu <lennox.wu@sunplusct.com>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
.extern start_kernel
.global init_thread_union
.global kernelsp
__INIT
ENTRY(_stext)
la r30, __bss_start /* initialize BSS segment. */
la r31, _end
xor r8, r8, r8
1: cmp.c r31, r30
beq 2f
sw r8, [r30] /* clean memory. */
addi r30, 4
b 1b
2: la r28, init_thread_union /* set kernel stack. */
mv r0, r28
addi r0, KERNEL_STACK_SIZE - 32
la r30, kernelsp
sw r0, [r30]
subi r0, 4*4
xor r30, r30, r30
ori r30, 0x02 /* enable MMU. */
mtcr r30, cr4
nop
nop
nop
nop
nop
nop
nop
/* there is no parameter */
xor r4, r4, r4
xor r5, r5, r5
xor r6, r6, r6
xor r7, r7, r7
la r30, start_kernel /* jump to init_arch */
br r30