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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. /** @addtogroup amd64  
  30.  * @{
  31.  */
  32. /** @file
  33.  *
  34.  */
  35.  
  36. #include <fpu_context.h>
  37.  
  38. /** Save FPU (mmx, sse) context using fxsave instruction */
  39. void fpu_context_save(fpu_context_t *fctx)
  40. {
  41.     asm volatile (
  42.         "fxsave %[fctx]\n"
  43.         : [fctx] "=m" (*fctx)
  44.     );
  45. }
  46.  
  47. /** Restore FPU (mmx,sse) context using fxrstor instruction */
  48. void fpu_context_restore(fpu_context_t *fctx)
  49. {
  50.     asm volatile (
  51.         "fxrstor %[fctx]\n"
  52.         : [fctx] "=m" (*fctx)
  53.     );
  54. }
  55.  
  56. void fpu_init()
  57. {
  58.     /* TODO: Zero all SSE, MMX etc. registers */
  59.     asm volatile (
  60.         "fninit\n"
  61.     );
  62. }
  63.  
  64. /** @}
  65.  */
  66.