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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
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