arch/avr32/kernel/head.S

   1 /*
   2  * Non-board-specific low-level startup code
   3  *
   4  * Copyright (C) 2004-2006 Atmel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/linkage.h>
  11
  12 #include <asm/page.h>
  13 #include <asm/thread_info.h>
  14 #include <asm/sysreg.h>
  15
  16         .section .init.text,"ax"
  17         .global kernel_entry
  18 kernel_entry:
  19         /* Initialize status register */
  20         lddpc   r0, init_sr
  21         mtsr    SYSREG_SR, r0
  22
  23         /* Set initial stack pointer */
  24         lddpc   sp, stack_addr
  25         sub     sp, -THREAD_SIZE
  26
  27 #ifdef CONFIG_FRAME_POINTER
  28         /* Mark last stack frame */
  29         mov     lr, 0
  30         mov     r7, 0
  31 #endif
  32
  33         /* Set up the PIO, SDRAM controller, early printk, etc. */
  34         rcall   board_early_init
  35
  36         /* Start the show */
  37         lddpc   pc, kernel_start_addr
  38
  39         .align  2
  40 init_sr:
  41         .long   0x007f0000      /* Supervisor mode, everything masked */
  42 stack_addr:
  43         .long   init_thread_union
  44 kernel_start_addr:
  45         .long   start_kernel