/*
* 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__ volatile (
"fnsave %0"
: "=m"(*fctx)
);
return;
}
void fpu_lazy_context_restore(fpu_context_t *fctx)
{
__asm__ volatile (
"frstor %0"
: "=m"(*fctx)
);
return;
}
void fpu_init(void)
{
__asm__ volatile (
"fninit;"
);
}