| /* | |
| * 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 |