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Annotation of Net2/arch/i386/include/cpufunc.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Functions to provide access to special i386 instructions.
                      3:  * XXX - bezillions more are defined in locore.s but are not declared anywhere.
                      4:  */
                      5: 
                      6: #include <sys/cdefs.h>
                      7: #include <sys/types.h>
                      8: 
                      9: #ifdef __GNUC__
                     10: 
                     11: static __inline int bdb(void)
                     12: {
                     13:        extern int bdb_exists;
                     14: 
                     15:        if (!bdb_exists)
                     16:                return (0);
                     17:        __asm("int $3");
                     18:        return (1);
                     19: }
                     20: 
                     21: static __inline void
                     22: disable_intr(void)
                     23: {
                     24:        __asm __volatile("cli");
                     25: }
                     26: 
                     27: static __inline void
                     28: enable_intr(void)
                     29: {
                     30:        __asm __volatile("sti");
                     31: }
                     32: 
                     33: /*
                     34:  * This roundabout method of returning a u_char helps stop gcc-1.40 from
                     35:  * generating unnecessary movzbl's.
                     36:  */
                     37: #define        inb(port)       ((u_char) u_int_inb(port))
                     38: 
                     39: static __inline u_int
                     40: u_int_inb(u_int port)
                     41: {
                     42:        u_char  data;
                     43:        /*
                     44:         * We use %%dx and not %1 here because i/o is done at %dx and not at
                     45:         * %edx, while gcc-2.2.2 generates inferior code (movw instead of movl)
                     46:         * if we tell it to load (u_short) port.
                     47:         */
                     48:        __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
                     49:        return data;
                     50: }
                     51: 
                     52: static __inline void
                     53: outb(u_int port, u_char data)
                     54: {
                     55:        register u_char al asm("ax");
                     56: 
                     57:        al = data;              /* help gcc-1.40's register allocator */
                     58:        __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
                     59: }
                     60: 
                     61: #else /* not __GNUC__ */
                     62: 
                     63: int    bdb             __P((void));
                     64: void   disable_intr    __P((void));
                     65: void   enable_intr     __P((void));
                     66: u_char inb             __P((u_int port));
                     67: void   outb            __P((u_int port, u_int data));  /* XXX - incompat */
                     68: 
                     69: #endif /* __GNUC__ */
                     70: 
                     71: #define        really_u_int    int     /* XXX */
                     72: #define        really_void     int     /* XXX */
                     73: 
                     74: void   load_cr0        __P((u_int cr0));
                     75: really_u_int   rcr0    __P((void));
                     76: 
                     77: #ifdef notyet
                     78: really_void    setidt  __P((int idx, /*XXX*/caddr_t func, int typ, int dpl));
                     79: #endif
                     80: 
                     81: #undef really_u_int
                     82: #undef really_void

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