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  1. /*
  2.  * Copyright (C) 2005 Jakub Vana
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  *
  28.  */
  29.  
  30. #include <fpu_context.h>
  31. #include <arch.h>
  32. #include <cpu.h>
  33.  
  34. void fpu_context_save(fpu_context_t *fctx)
  35. {
  36. }
  37.  
  38.  
  39. void fpu_context_restore(fpu_context_t *fctx)
  40. {
  41.     if(THREAD==CPU->fpu_owner) {reset_TS_flag(); }
  42.     else
  43.     {
  44.         set_TS_flag();
  45.         if((CPU->fpu_owner)!=NULL)(CPU->fpu_owner)->fpu_context_engaged=1;
  46.     }
  47. }
  48.  
  49.  
  50. void fpu_lazy_context_save(fpu_context_t *fctx)
  51. {
  52.     asm
  53.     (
  54.         "push %%eax;"
  55.         "mov 0x8(%%esp),%%eax;"
  56.         "fnsave (%%eax);"
  57.         "pop %%eax;"
  58.         :"=m"(fctx)
  59.         :
  60.         :"eax"
  61.     ); 
  62. }
  63.  
  64. void fpu_lazy_context_restore(fpu_context_t *fctx)
  65. {
  66.     asm
  67.     (
  68.         "push %%eax;"
  69.         "mov 0x8(%%esp),%%eax;"
  70.         "frstor (%%eax);"
  71.         "pop %%eax;"
  72.         :"=m"(fctx)
  73.         :
  74.         :"eax"
  75.     );
  76. }
  77.  
  78. void fpu_init(void)
  79. {
  80.     asm(
  81.         "fninit;"
  82.     );
  83. }
  84.