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52 vana 1 
/*
92 jermar 2 
 * Copyright (C) 2005 Jakub Vana
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *
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 */
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#include <fpu_context.h>
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#include <arch.h>
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#include <cpu.h>
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void fpu_context_save(fpu_context_t *fctx)
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{
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}
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void fpu_context_restore(fpu_context_t *fctx)
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{
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    if(THREAD==CPU->fpu_owner) {reset_TS_flag(); }
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    else
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    {
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        set_TS_flag();
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        if((CPU->fpu_owner)!=NULL)(CPU->fpu_owner)->fpu_context_engaged=1;
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    }
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}
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void fpu_lazy_context_save(fpu_context_t *fctx)
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{
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    asm
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    (
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        "push %%eax;"
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        "mov 0x8(%%esp),%%eax;"
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        "fnsave (%%eax);"
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        "pop %%eax;"
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        :"=m"(fctx)
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        :
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        :"eax"
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    ); 
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}
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void fpu_lazy_context_restore(fpu_context_t *fctx)
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{
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    asm
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    (
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        "push %%eax;"
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        "mov 0x8(%%esp),%%eax;"
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        "frstor (%%eax);"
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        "pop %%eax;"
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        :"=m"(fctx)
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        :
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        :"eax"
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    );
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}
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void fpu_init(void)
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{
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    asm(
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        "fninit;"
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    );
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}