fpu_context.c

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00001 /*
00002  * Copyright (C) 2005 Jakub Vana
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  *
00009  * - Redistributions of source code must retain the above copyright
00010  *   notice, this list of conditions and the following disclaimer.
00011  * - Redistributions in binary form must reproduce the above copyright
00012  *   notice, this list of conditions and the following disclaimer in the
00013  *   documentation and/or other materials provided with the distribution.
00014  * - The name of the author may not be used to endorse or promote products
00015  *   derived from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00019  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00020  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00022  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00024  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00025  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00026  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 
00036 #include <fpu_context.h>
00037 #include <arch.h>
00038 #include <cpu.h>
00039 
00041 void fpu_context_save(fpu_context_t *fctx)
00042 {
00043         __asm__ volatile (
00044                 "fxsave %0"
00045                 : "=m"(*fctx)
00046                 );
00047 }
00048 
00050 void fpu_context_restore(fpu_context_t *fctx)
00051 {
00052         __asm__ volatile (
00053                 "fxrstor %0"
00054                 : "=m"(*fctx)
00055                 );
00056 }
00057 
00058 void fpu_init()
00059 {
00060         /* TODO: Zero all SSE, MMX etc. registers */
00061         __asm__ volatile (
00062                 "fninit;"
00063         );
00064 }
00065 

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