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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. void fpu_context_save(fpu_context_t *fctx)
  36. {
  37. }
  38.  
  39.  
  40. void fpu_context_restore(fpu_context_t *fctx)
  41. {
  42.     if(THREAD==CPU->fpu_owner) {reset_TS_flag(); }
  43.     else
  44.     {
  45.         set_TS_flag();
  46.         if((CPU->fpu_owner)!=NULL)(CPU->fpu_owner)->fpu_context_engaged=1;
  47.     }
  48. }
  49.  
  50.  
  51. void fpu_lazy_context_save(fpu_context_t *fctx)
  52. {
  53.     asm
  54.     (
  55.         "push %%eax;"
  56.         "mov 0x8(%%esp),%%eax;"
  57.         "fnsave (%%eax);"
  58.         "pop %%eax;"
  59.         :"=m"(fctx)
  60.         :
  61.         :"eax"
  62.     ); 
  63. }
  64.  
  65. void fpu_lazy_context_restore(fpu_context_t *fctx)
  66. {
  67.     asm
  68.     (
  69.         "push %%eax;"
  70.         "mov 0x8(%%esp),%%eax;"
  71.         "frstor (%%eax);"
  72.         "pop %%eax;"
  73.         :"=m"(fctx)
  74.         :
  75.         :"eax"
  76.     );
  77. }
  78.  
  79. void fpu_init(void)
  80. {
  81.     asm(
  82.             "fninit;"
  83.     );
  84. }
  85.