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 35ENTRY(_stext) 36 la r30, __bss_start /* initialize BSS segment. */ 37 la r31, _end 38 xor r8, r8, r8 39 401: cmp.c r31, r30 41 beq 2f 42 43 sw r8, [r30] /* clean memory. */ 44 addi r30, 4 45 b 1b 46 472: 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 71