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Rev 3022 Rev 4055
Line 75... Line 75...
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 * cr0.mp = 1 -> we do want lazy context switch
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 * cr0.mp = 1 -> we do want lazy context switch
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 */
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 */
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void cpu_setup_fpu(void)
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void cpu_setup_fpu(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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        "movq %%cr0, %%rax;"
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        "movq %%cr0, %%rax\n"
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        "btsq $1, %%rax;" /* cr0.mp */
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        "btsq $1, %%rax\n"  /* cr0.mp */
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        "btrq $2, %%rax;"  /* cr0.em */
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        "btrq $2, %%rax\n"  /* cr0.em */
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        "movq %%rax, %%cr0;"
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        "movq %%rax, %%cr0\n"
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        "movq %%cr4, %%rax;"
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        "movq %%cr4, %%rax\n"
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        "bts $9, %%rax;" /* cr4.osfxsr */
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        "bts $9, %%rax\n"   /* cr4.osfxsr */
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        "movq %%rax, %%cr4;"
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        "movq %%rax, %%cr4\n"
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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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/** Set the TS flag to 1.
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/** Set the TS flag to 1.
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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 fpu_disable(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\n"
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        "bts $3,%%rax;"
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        "bts $3, %%rax\n"
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        "mov %%rax,%%cr0;"
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        "mov %%rax, %%cr0\n"
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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 fpu_enable(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\n"
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        "btr $3,%%rax;"
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        "btr $3, %%rax\n"
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        "mov %%rax,%%cr0;"
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        "mov %%rax, %%cr0\n"
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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 cpu_arch_init(void)
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void cpu_arch_init(void)
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{
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{
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    CPU->arch.tss = tss_p;
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    CPU->arch.tss = tss_p;