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avr32
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kernel
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head.S

head.S 914 B
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  1. /*
    2. 

  2.  * Non-board-specific low-level startup code
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2004-2006 Atmel Corporation
    5. 

  5.  *
    6. 

  6.  * This program is free software; you can redistribute it and/or modify
    7. 

  7.  * it under the terms of the GNU General Public License version 2 as
    8. 

  8.  * published by the Free Software Foundation.
    9. 

  9.  */
    10. 

  10. #include <linux/linkage.h>
    11. 

  11. 

  12. #include <asm/page.h>
    13. 

  13. #include <asm/thread_info.h>
    14. 

  14. #include <asm/sysreg.h>
    15. 

  15. 

  16. 	.section .init.text,"ax"
    17. 

  17. 	.global kernel_entry
    18. 

  18. kernel_entry:
    19. 

  19. 	/* Initialize status register */
    20. 

  20. 	lddpc   r0, init_sr
    21. 

  21. 	mtsr	SYSREG_SR, r0
    22. 

  22. 

  23. 	/* Set initial stack pointer */
    24. 

  24. 	lddpc   sp, stack_addr
    25. 

  25. 	sub	sp, -THREAD_SIZE
    26. 

  26. 

  27. #ifdef CONFIG_FRAME_POINTER
    28. 

  28. 	/* Mark last stack frame */
    29. 

  29. 	mov	lr, 0
    30. 

  30. 	mov	r7, 0
    31. 

  31. #endif
    32. 

  32. 

  33. 	/* Start the show */
    34. 

  34. 	lddpc   pc, kernel_start_addr
    35. 

  35. 

  36. 	.align  2
    37. 

  37. init_sr:
    38. 

  38. 	.long   0x007f0000	/* Supervisor mode, everything masked */
    39. 

  39. stack_addr:
    40. 

  40. 	.long   init_thread_union
    41. 

  41. kernel_start_addr:
    42. 

  42. 	.long   start_kernel
    43.