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Rev 2927 Rev 4345
Line 42... Line 42...
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static fpu_context_function fpu_save, fpu_restore;
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static fpu_context_function fpu_save, fpu_restore;
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static void fpu_context_f_save(fpu_context_t *fctx)
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static void fpu_context_f_save(fpu_context_t *fctx)
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{
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{
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    asm volatile (
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    asm volatile (
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        "fnsave %0"
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        "fnsave %[fctx]"
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        : "=m"(*fctx)
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        : [fctx] "=m" (*fctx)
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        );
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    );
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}
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}
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static void fpu_context_f_restore(fpu_context_t *fctx)
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static void fpu_context_f_restore(fpu_context_t *fctx)
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{
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{
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    asm volatile (
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    asm volatile (
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        "frstor %0"
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        "frstor %[fctx]"
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        : "=m"(*fctx)
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        : [fctx] "=m" (*fctx)
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        );
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    );
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}
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}
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static void fpu_context_fx_save(fpu_context_t *fctx)
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static void fpu_context_fx_save(fpu_context_t *fctx)
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{
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{
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    asm volatile (
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    asm volatile (
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        "fxsave %0"
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        "fxsave %[fctx]"
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        : "=m"(*fctx)
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        : [fctx] "=m" (*fctx)
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        );
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    );
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}
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}
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static void fpu_context_fx_restore(fpu_context_t *fctx)
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static void fpu_context_fx_restore(fpu_context_t *fctx)
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{
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{
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    asm volatile (
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    asm volatile (
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        "fxrstor %0"
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        "fxrstor %[fctx]"
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        : "=m"(*fctx)
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        : [fctx] "=m" (*fctx)
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        );
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    );
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}
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}
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/*
 - 
 
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    Setup using fxsr instruction
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/* Setup using fxsr instruction */
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*/
 - 
 
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void fpu_fxsr(void)
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void fpu_fxsr(void)
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{
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{
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    fpu_save=fpu_context_fx_save;
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    fpu_save=fpu_context_fx_save;
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    fpu_restore=fpu_context_fx_restore;
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    fpu_restore=fpu_context_fx_restore;
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}
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}
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/*
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    Setup using not fxsr instruction
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/* Setup using not fxsr instruction */
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*/
 - 
 
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void fpu_fsr(void)
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void fpu_fsr(void)
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{
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{
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    fpu_save = fpu_context_f_save;
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    fpu_save = fpu_context_f_save;
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    fpu_restore = fpu_context_f_restore;
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    fpu_restore = fpu_context_f_restore;
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}
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}
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    fpu_restore(fctx);
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    fpu_restore(fctx);
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}
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}
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void fpu_init()
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void fpu_init()
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{
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{
- 
 
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    uint32_t help0 = 0;
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    uint32_t help0 = 0, help1 = 0;
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    uint32_t help1 = 0;
- 
 
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    asm volatile (
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    asm volatile (
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        "fninit;\n"
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        "fninit\n"
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        "stmxcsr %0\n"
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        "stmxcsr %[help0]\n"
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        "mov %0,%1;\n"
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        "mov %[help0], %[help1]\n"
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        "or %2,%1;\n"
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        "or %[magic], %[help1]\n"
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        "mov %1,%0;\n"
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        "mov %[help1], %[help0]\n"
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        "ldmxcsr %0;\n"
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        "ldmxcsr %[help0]\n"
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        : "+m" (help0), "+r" (help1)
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        : [help0] "+m" (help0), [help1] "+r" (help1)
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        : "i" (0x1f80)
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        : [magic] "i" (0x1f80)
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    );
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    );
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}
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}
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/** @}
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/** @}
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 */
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 */