source: mainline/arch/ia32/src/fpu_context.c@ 87be9cfb

/*
#
# Copyright (C) 2005 Jakub Vana
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
*/

#include <fpu_context.h>
#include <arch.h>
#include <cpu.h>


void fpu_context_save(fpu_context_t *fctx)
{
}


void fpu_context_restore(fpu_context_t *fctx)
{
        if(THREAD==CPU->fpu_owner) {reset_TS_flag(); }
        else 
        {
                set_TS_flag(); 
                if((CPU->fpu_owner)!=NULL)(CPU->fpu_owner)->fpu_context_engaged=1;
        }
}


void fpu_lazy_context_save(fpu_context_t *fctx)
{
    asm(
        "mov %0,%%eax;"
        "fxsave (%%eax);"
        "ret;"
        :"=m"(fctx)
        :
        :"%eax"
    );  
}

void fpu_lazy_context_restore(fpu_context_t *fctx)
{
    asm(
        "mov %0,%%eax;"
        "fxrstor (%%eax);"
        "ret;"
        :"=m"(fctx)
        :
        :"%eax"
    );
}

void fpu_init(void)
{
    asm(
        "fninit;"
    );
}