/*
   * 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