/*
   * Startup code for use with the u-boot bootloader.
   *
   * Copyright (C) 2004-2006 Atmel Corporation
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #include <asm/setup.h>
  
  	/*
  	 * The kernel is loaded where we want it to be and all caches
  	 * have just been flushed. We get two parameters from u-boot:
  	 *
  	 * r12 contains a magic number (ATAG_MAGIC)
  	 * r11 points to a tag table providing information about
  	 *     the system.
  	 */
  	.section .init.text,"ax"
  	.global _start
  _start:
  	/* Check if the boot loader actually provided a tag table */
  	lddpc	r0, magic_number
  	cp.w	r12, r0
  	brne	no_tag_table
  
  	/* Initialize .bss */
  	lddpc	r2, bss_start_addr
  	lddpc   r3, end_addr
  	mov	r0, 0
  	mov	r1, 0
  1:      st.d    r2++, r0
  	cp      r2, r3
  	brlo    1b
  
  	/*
  	 * Save the tag table address for later use. This must be done
  	 * _after_ .bss has been initialized...
  	 */
  	lddpc	r0, tag_table_addr
  	st.w	r0[0], r11
  
  	/* Jump to loader-independent setup code */
  	rjmp	kernel_entry
  
  	.align	2
  magic_number:
  	.long	ATAG_MAGIC
  tag_table_addr:
  	.long	bootloader_tags
  bss_start_addr:
  	.long   __bss_start
  end_addr:
  	.long   _end
  
  no_tag_table:
  	sub	r12, pc, (. - 2f)
  	bral	panic
  2:	.asciz	"Boot loader didn't provide correct magic number
  "