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diff --git a/arch/score/kernel/head.S b/arch/score/kernel/head.S
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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