/*
* 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.
*/
/** @addtogroup kernel_amd64
* @{
*/
/** @file
*
*/
#include <fpu_context.h>
/** Save FPU (mmx, sse) context using fxsave instruction */
void fpu_context_save(fpu_context_t *fctx)
{
asm volatile (
"fxsave %[fctx]\n"
: [fctx] "=m" (fctx->fpu)
);
}
/** Restore FPU (mmx,sse) context using fxrstor instruction */
void fpu_context_restore(fpu_context_t *fctx)
{
asm volatile (
"fxrstor %[fctx]\n"
: [fctx] "=m" (fctx->fpu)
);
}
void fpu_init(void)
{
/* TODO: Zero all SSE, MMX etc. registers */
/*
* Default value of SCR register is 0x1f80,
* it masks all FPU exceptions
*/
asm volatile (
"fninit\n"
);
}
/** @}
*/