cpufunc.h revision 1549 
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 *	$Id: cpufunc.h,v 1.9 1994/01/31 23:48:23 davidg Exp $
6 */
7
8#ifndef _MACHINE_CPUFUNC_H_
9#define _MACHINE_CPUFUNC_H_ 1
10
11#include <sys/cdefs.h>
12#include <sys/types.h>
13
14#include "machine/spl.h"
15
16#ifdef	__GNUC__
17
18static inline int bdb(void)
19{
20	extern int bdb_exists;
21
22	if (!bdb_exists)
23		return (0);
24	__asm("int $3");
25	return (1);
26}
27
28static inline void
29disable_intr(void)
30{
31	__asm __volatile("cli");
32}
33
34static inline void
35enable_intr(void)
36{
37	__asm __volatile("sti");
38}
39
40/*
41 * This roundabout method of returning a u_char helps stop gcc-1.40 from
42 * generating unnecessary movzbl's.
43 */
44#define	inb(port)	((u_char) u_int_inb(port))
45
46static inline u_int
47u_int_inb(u_int port)
48{
49	u_char	data;
50	/*
51	 * We use %%dx and not %1 here because i/o is done at %dx and not at
52	 * %edx, while gcc-2.2.2 generates inferior code (movw instead of movl)
53	 * if we tell it to load (u_short) port.
54	 */
55	__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
56	return data;
57}
58
59static inline void
60outb(u_int port, u_char data)
61{
62	register u_char	al asm("ax");
63
64	al = data;		/* help gcc-1.40's register allocator */
65	__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
66}
67
68static inline void
69tlbflush()
70{
71	__asm __volatile("movl %%cr3, %%eax; movl %%eax, %%cr3" : : : "ax");
72}
73
74#else /* not __GNUC__ */
75extern	void insque __P((void *, void *));
76extern	void remque __P((void *));
77
78int	bdb		__P((void));
79void	disable_intr	__P((void));
80void	enable_intr	__P((void));
81u_char	inb		__P((u_int port));
82void	outb		__P((u_int port, u_int data));	/* XXX - incompat */
83
84#endif	/* __GNUC__ */
85
86void	load_cr0	__P((u_int cr0));
87u_int	rcr0	__P((void));
88void load_cr3(u_long);
89u_long rcr3(void);
90u_long rcr2(void);
91
92void	setidt	__P((int, void (*)(), int, int));
93extern u_long kvtop(void *);
94extern void outw(int /*u_short*/, int /*u_short*/); /* XXX inline!*/
95extern void outsb(int /*u_short*/, void *, size_t);
96extern void outsw(int /*u_short*/, void *, size_t);
97extern void insw(int /*u_short*/, void *, size_t);
98extern void fillw(int /*u_short*/, void *, size_t);
99extern void filli(int, void *, size_t);
100
101#endif /* _MACHINE_CPUFUNC_H_ */
102