Subversion Repositories HelenOS-historic

/*

#

# 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(); (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;"

    );

}