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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. /** Save FPU (mmx, sse) context using fxsave instruction */
  35. void fpu_context_save(fpu_context_t *fctx)
  36. {
  37.     /* Align on 16-byte boundary */
  38.     if (((__u64)fctx) & 0xf)
  39.         fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1);
  40.  
  41.     __asm__ volatile (
  42.         "fxsave %0"
  43.         : "=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.     /* Align on 16-byte boundary */
  51.     if (((__u64)fctx) & 0xf)
  52.         fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1);
  53.     __asm__ volatile (
  54.         "fxrstor %0"
  55.         : "=m"(*fctx)
  56.         );
  57. }
  58.  
  59. void fpu_init(void)
  60. {
  61.     /* TODO: Zero all SSE, MMX etc. registers */
  62.     __asm__ volatile (
  63.         "fninit;"
  64.     );
  65. }
  66.