i387.h

来自「xen虚拟机源代码安装包」· C头文件 代码 · 共 47 行

/*
 * include/asm-i386/i387.h
 *
 * Copyright (C) 1994 Linus Torvalds
 *
 * Pentium III FXSR, SSE support
 * General FPU state handling cleanups
 *	Gareth Hughes <[e-mail]>, May 2000
 */

#ifndef __ASM_I386_I387_H
#define __ASM_I386_I387_H

#include <xen/sched.h>
#include <asm/processor.h>

extern void init_fpu(void);
extern void save_init_fpu(struct vcpu *v);
extern void restore_fpu(struct vcpu *v);

#define unlazy_fpu(v) do {                      \
    if ( (v)->fpu_dirtied )                     \
        save_init_fpu(v);                       \
} while ( 0 )

#define load_mxcsr(val) do {                                    \
    unsigned long __mxcsr = ((unsigned long)(val) & 0xffbf);    \
    __asm__ __volatile__ ( "ldmxcsr %0" : : "m" (__mxcsr) );    \
} while ( 0 )

static inline void setup_fpu(struct vcpu *v)
{
    /* Avoid recursion. */
    clts();

    if ( !v->fpu_dirtied )
    {
        v->fpu_dirtied = 1;
        if ( v->fpu_initialised )
            restore_fpu(v);
        else
            init_fpu();
    }
}

#endif /* __ASM_I386_I387_H */