/arch/sparc/lib/NGpatch.S

https://bitbucket.org/cresqo/cm7-p500-kernel · Assembly · 33 lines · 27 code · 2 blank · 4 comment · 0 complexity · aceedb7675f36addfda6a80fcb1b7e52 MD5 · raw file

  1. /* NGpatch.S: Patch Ultra-I routines with Niagara variant.
  2. *
  3. * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
  4. */
  5. #define BRANCH_ALWAYS 0x10680000
  6. #define NOP 0x01000000
  7. #define NG_DO_PATCH(OLD, NEW) \
  8. sethi %hi(NEW), %g1; \
  9. or %g1, %lo(NEW), %g1; \
  10. sethi %hi(OLD), %g2; \
  11. or %g2, %lo(OLD), %g2; \
  12. sub %g1, %g2, %g1; \
  13. sethi %hi(BRANCH_ALWAYS), %g3; \
  14. sll %g1, 11, %g1; \
  15. srl %g1, 11 + 2, %g1; \
  16. or %g3, %lo(BRANCH_ALWAYS), %g3; \
  17. or %g3, %g1, %g3; \
  18. stw %g3, [%g2]; \
  19. sethi %hi(NOP), %g3; \
  20. or %g3, %lo(NOP), %g3; \
  21. stw %g3, [%g2 + 0x4]; \
  22. flush %g2;
  23. .globl niagara_patch_copyops
  24. .type niagara_patch_copyops,#function
  25. niagara_patch_copyops:
  26. NG_DO_PATCH(memcpy, NGmemcpy)
  27. NG_DO_PATCH(___copy_from_user, NGcopy_from_user)
  28. NG_DO_PATCH(___copy_to_user, NGcopy_to_user)
  29. retl
  30. nop
  31. .size niagara_patch_copyops,.-niagara_patch_copyops