/* * 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 |