kernel/arch/mips32/src/fpu_context.c

   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 mips32
  30  * @{
  31  */
  32 /** @file
  33  *
  34  */
  35
  36 #include <fpu_context.h>
  37 #include <arch.h>
  38 #include <arch/cp0.h>
  39 #include <proc/thread.h>
  40
  41 void fpu_disable(void)
  42 {
  43 #ifdef ARCH_HAS_FPU
  44         cp0_status_write(cp0_status_read() & ~cp0_status_fpu_bit);
  45 #endif
  46 }
  47
  48 void fpu_enable(void)
  49 {
  50 #ifdef ARCH_HAS_FPU
  51         cp0_status_write(cp0_status_read() | cp0_status_fpu_bit);
  52 #endif
  53 }
  54
  55 void fpu_init()
  56 {
  57         /* TODO: Zero all registers */
  58 }
  59
  60 /** @}
  61  */