Home | History | Annotate | Line # | Download | only in include
cpufunc.h revision 1.1 
      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
     83