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 *
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 *
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 * If a thread accesses coprocessor, exception is run, which
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 * If a thread accesses coprocessor, exception is run, which
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 * does a lazy fpu context switch.
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 * does a lazy fpu context switch.
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 *
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 *
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 */
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 */
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void set_TS_flag(void)
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void fpu_disable(void)
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{
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{
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    __asm__ volatile (
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    __asm__ volatile (
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        "mov %%cr0,%%rax;"
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        "mov %%cr0,%%rax;"
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        "bts $3,%%rax;"
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        "bts $3,%%rax;"
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        "mov %%rax,%%cr0;"
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        "mov %%rax,%%cr0;"
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        :
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        :
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        :"%rax"
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        :"%rax"
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        );
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        );
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}
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}
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void reset_TS_flag(void)
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void fpu_enable(void)
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{
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{
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    __asm__ volatile (
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    __asm__ volatile (
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        "mov %%cr0,%%rax;"
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        "mov %%cr0,%%rax;"
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        "btr $3,%%rax;"
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        "btr $3,%%rax;"
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        "mov %%rax,%%cr0;"
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        "mov %%rax,%%cr0;"