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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 ia32  
  30.  * @{
  31.  */
  32. /** @file
  33.  *
  34.  */
  35.  
  36. #include <fpu_context.h>
  37. #include <arch.h>
  38. #include <cpu.h>
  39.  
  40. typedef void (*fpu_context_function)(fpu_context_t *fctx);
  41.  
  42. static fpu_context_function fpu_save,fpu_restore;
  43.  
  44.  
  45.  
  46. static void fpu_context_f_save(fpu_context_t *fctx)
  47. {
  48.     __asm__ volatile (
  49.         "fnsave %0"
  50.         : "=m"(*fctx)
  51.         );
  52. }
  53.  
  54. static void fpu_context_f_restore(fpu_context_t *fctx)
  55. {
  56.     __asm__ volatile (
  57.         "frstor %0"
  58.         : "=m"(*fctx)
  59.         );
  60. }
  61.  
  62. static void fpu_context_fx_save(fpu_context_t *fctx)
  63. {
  64.     __asm__ volatile (
  65.         "fxsave %0"
  66.         : "=m"(*fctx)
  67.         );
  68. }
  69.  
  70. static void fpu_context_fx_restore(fpu_context_t *fctx)
  71. {
  72.     __asm__ volatile (
  73.         "fxrstor %0"
  74.         : "=m"(*fctx)
  75.         );
  76. }
  77.  
  78. /*
  79.     Setup using fxsr instruction
  80. */
  81. void fpu_fxsr(void)
  82. {
  83.     fpu_save=fpu_context_fx_save;
  84.     fpu_restore=fpu_context_fx_restore;
  85. }
  86. /*
  87.     Setup using not fxsr instruction
  88. */
  89. void fpu_fsr(void)
  90. {
  91.     fpu_save=fpu_context_f_save;
  92.     fpu_restore=fpu_context_f_restore;
  93. }
  94.  
  95.  
  96.  
  97. void fpu_context_save(fpu_context_t *fctx)
  98. {
  99.     fpu_save(fctx);
  100. }
  101.  
  102. void fpu_context_restore(fpu_context_t *fctx)
  103. {
  104.     fpu_restore(fctx);
  105. }
  106.  
  107.  
  108.  
  109. void fpu_init()
  110. {
  111.     uint32_t help0=0,help1=0;
  112.     __asm__ volatile (
  113.         "fninit;\n"
  114.         "stmxcsr %0\n"
  115.         "mov %0,%1;\n"
  116.         "or %2,%1;\n"
  117.         "mov %1,%0;\n"
  118.         "ldmxcsr %0;\n"
  119.         :"+m"(help0),"+r"(help1)
  120.         :"i"(0x1f80)
  121.     );
  122. }
  123.  
  124.  /** @}
  125.  */
  126.  
  127.