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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. typedef void (*fpu_context_function)(fpu_context_t *fctx);
  35.  
  36. static fpu_context_function fpu_save,fpu_restore;
  37.  
  38.  
  39.  
  40. static void fpu_context_f_save(fpu_context_t *fctx)
  41. {
  42.     __asm__ volatile (
  43.         "fnsave %0"
  44.         : "=m"(*fctx)
  45.         );
  46. }
  47.  
  48. static void fpu_context_f_restore(fpu_context_t *fctx)
  49. {
  50.     __asm__ volatile (
  51.         "frstor %0"
  52.         : "=m"(*fctx)
  53.         );
  54. }
  55.  
  56. static void fpu_context_fx_save(fpu_context_t *fctx)
  57. {
  58.     __asm__ volatile (
  59.         "fxsave %0"
  60.         : "=m"(*fctx)
  61.         );
  62. }
  63.  
  64. static void fpu_context_fx_restore(fpu_context_t *fctx)
  65. {
  66.     __asm__ volatile (
  67.         "fxrstor %0"
  68.         : "=m"(*fctx)
  69.         );
  70. }
  71.  
  72. /*
  73.     Setup using fxsr instruction
  74. */
  75. void fpu_fxsr(void)
  76. {
  77.     fpu_save=fpu_context_fx_save;
  78.     fpu_restore=fpu_context_fx_restore;
  79. }
  80. /*
  81.     Setup using not fxsr instruction
  82. */
  83. void fpu_fsr(void)
  84. {
  85.     fpu_save=fpu_context_f_save;
  86.     fpu_restore=fpu_context_f_restore;
  87. }
  88.  
  89.  
  90.  
  91. void fpu_context_save(fpu_context_t *fctx)
  92. {
  93.     fpu_save(fctx);
  94. }
  95.  
  96. void fpu_context_restore(fpu_context_t *fctx)
  97. {
  98.     fpu_restore(fctx);
  99. }
  100.  
  101.  
  102.  
  103. void fpu_init()
  104. {
  105.     __u32 help0=0,help1=0;
  106.     __asm__ volatile (
  107.         "fninit;\n"
  108.         "stmxcsr %0\n"
  109.         "mov %0,%1;\n"
  110.         "or %2,%1;\n"
  111.         "mov %1,%0;\n"
  112.         "ldmxcsr %0;\n"
  113.         :"+m"(help0),"+r"(help1)
  114.         :"i"(0x1f80)
  115.     );
  116. }
  117.