/arch/powerpc/boot/virtex405-head.S

http://github.com/mirrors/linux · Assembly · 31 lines · 17 code · 3 blank · 11 comment · 0 complexity · e3e59d26b99b7a6b79e7077ca7f36946 MD5 · raw file 

    

  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. #include "ppc_asm.h"
    3. 

  3. 

  4. 	.text
    5. 

  5. 	.global _zimage_start
    6. 

  6. _zimage_start:
    7. 

  7. 

  8. 	/* PPC errata 213: needed by Virtex-4 FX */
    9. 

  9. 	mfccr0  0
    10. 

  10. 	oris    0,0,0x50000000@h
    11. 

  11. 	mtccr0  0
    12. 

  12. 

  13. 	/*
    14. 

  14. 	 * Invalidate the data cache if the data cache is turned off.
    15. 

  15. 	 * - The 405 core does not invalidate the data cache on power-up
    16. 

  16. 	 *   or reset but does turn off the data cache. We cannot assume
    17. 

  17. 	 *   that the cache contents are valid.
    18. 

  18. 	 * - If the data cache is turned on this must have been done by
    19. 

  19. 	 *   a bootloader and we assume that the cache contents are
    20. 

  20. 	 *   valid.
    21. 

  21. 	 */
    22. 

  22. 	mfdccr	r9
    23. 

  23. 	cmplwi	r9,0
    24. 

  24. 	bne	2f
    25. 

  25. 	lis	r9,0
    26. 

  26. 	li	r8,256
    27. 

  27. 	mtctr	r8
    28. 

  28. 1:	dccci	r0,r9
    29. 

  29. 	addi	r9,r9,0x20
    30. 

  30. 	bdnz	1b
    31. 

  31. 2:	b	_zimage_start_lib
    32.