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  1. /*
  2. #
  3. # Copyright (C) 2005 Jakub Vana
  4. # All rights reserved.
  5. #
  6. # Redistribution and use in source and binary forms, with or without
  7. # modification, are permitted provided that the following conditions
  8. # are met:
  9. #
  10. # - Redistributions of source code must retain the above copyright
  11. #   notice, this list of conditions and the following disclaimer.
  12. # - Redistributions in binary form must reproduce the above copyright
  13. #   notice, this list of conditions and the following disclaimer in the
  14. #   documentation and/or other materials provided with the distribution.
  15. # - The name of the author may not be used to endorse or promote products
  16. #   derived from this software without specific prior written permission.
  17. #
  18. # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19. # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20. # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21. # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22. # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23. # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24. # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25. # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26. # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27. # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28. #
  29. */
  30.  
  31. #include <fpu_context.h>
  32. #include <arch.h>
  33. #include <cpu.h>
  34.  
  35.  
  36. void fpu_context_save(fpu_context_t *fctx)
  37. {
  38. }
  39.  
  40.  
  41. void fpu_context_restore(fpu_context_t *fctx)
  42. {
  43.     if(THREAD==CPU->fpu_owner) {reset_TS_flag(); }
  44.     else {set_TS_flag(); (CPU->fpu_owner)->fpu_context_engaged=1;}
  45. }
  46.  
  47.  
  48. void fpu_lazy_context_save(fpu_context_t *fctx)
  49. {
  50.     asm(
  51.         "mov %0,%%eax;"
  52.         "fxsave (%%eax);"
  53.         "ret;"
  54.     :"=m"(fctx)
  55.     :
  56.     :"%eax"
  57.     ); 
  58. }
  59.  
  60. void fpu_lazy_context_restore(fpu_context_t *fctx)
  61. {
  62.     asm(
  63.         "mov %0,%%eax;"
  64.         "fxrstor (%%eax);"
  65.         "ret;"
  66.     :"=m"(fctx)
  67.     :
  68.     :"%eax"
  69.     );
  70. }
  71.  
  72. void fpu_init(void)
  73. {
  74.     asm(
  75.         "fninit;"
  76.     );
  77. }
  78.  
  79.