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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. void fpu_context_restore(fpu_context_t *fctx)
  39. {
  40.     if(THREAD==CPU->fpu_owner)
  41.         reset_TS_flag();
  42.     else {
  43.         set_TS_flag();
  44.         if (CPU->fpu_owner != NULL)
  45.             CPU->fpu_owner->fpu_context_engaged=1;
  46.     }
  47. }
  48.  
  49.  
  50. void fpu_lazy_context_save(fpu_context_t *fctx)
  51. {
  52.     /* TODO: We need malloc that allocates on 16-byte boundary !! */
  53.     if (((__u64)fctx) & 0xf)
  54.         fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1);
  55.  
  56.     __asm__ volatile (
  57.         "fxsave %0"
  58.         : "=m"(*fctx)
  59.         );
  60. }
  61.  
  62. void fpu_lazy_context_restore(fpu_context_t *fctx)
  63. {
  64.     /* TODO: We need malloc that allocates on 16-byte boundary !! */
  65.     if (((__u64)fctx) & 0xf)
  66.         fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1);
  67.     __asm__ volatile (
  68.         "fxrstor %0"
  69.         : "=m"(*fctx)
  70.         );
  71. }
  72.  
  73. void fpu_init(void)
  74. {
  75.     __asm__ volatile (
  76.         "fninit;"
  77.     );
  78. }
  79.