| Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 1 | /* |
| 2 | * arch/score/kernel/head.S |
| 3 | * |
| 4 | * Score Processor version. |
| 5 | * |
| 6 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. |
| 7 | * Chen Liqin <liqin.chen@sunplusct.com> |
| 8 | * Lennox Wu <lennox.wu@sunplusct.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, see the file COPYING, or write |
| 22 | * to the Free Software Foundation, Inc., |
| 23 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 24 | */ |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/linkage.h> |
| 27 | |
| 28 | #include <asm/asm-offsets.h> |
| 29 | |
| 30 | .extern start_kernel |
| 31 | .global init_thread_union |
| 32 | .global kernelsp |
| 33 | |
| 34 | __INIT |
| 35 | ENTRY(_stext) |
| 36 | la r30, __bss_start /* initialize BSS segment. */ |
| 37 | la r31, _end |
| 38 | xor r8, r8, r8 |
| 39 | |
| 40 | 1: cmp.c r31, r30 |
| 41 | beq 2f |
| 42 | |
| 43 | sw r8, [r30] /* clean memory. */ |
| 44 | addi r30, 4 |
| 45 | b 1b |
| 46 | |
| 47 | 2: la r28, init_thread_union /* set kernel stack. */ |
| 48 | mv r0, r28 |
| 49 | addi r0, KERNEL_STACK_SIZE - 32 |
| 50 | la r30, kernelsp |
| 51 | sw r0, [r30] |
| 52 | subi r0, 4*4 |
| 53 | xor r30, r30, r30 |
| 54 | ori r30, 0x02 /* enable MMU. */ |
| 55 | mtcr r30, cr4 |
| 56 | nop |
| 57 | nop |
| 58 | nop |
| 59 | nop |
| 60 | nop |
| 61 | nop |
| 62 | nop |
| 63 | |
| 64 | /* there is no parameter */ |
| 65 | xor r4, r4, r4 |
| 66 | xor r5, r5, r5 |
| 67 | xor r6, r6, r6 |
| 68 | xor r7, r7, r7 |
| 69 | la r30, start_kernel /* jump to init_arch */ |
| 70 | br r30 |
