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/*
* Functions to provide access to special i386 instructions.
* XXX - bezillions more are defined in locore.s but are not declared anywhere.
*
* $Id: cpufunc.h,v 1.9 1994/01/31 23:48:23 davidg Exp $
*/
#ifndef _MACHINE_CPUFUNC_H_
#define _MACHINE_CPUFUNC_H_ 1
#include <sys/cdefs.h>
#include <sys/types.h>
#include "machine/spl.h"
#ifdef __GNUC__
static inline int bdb(void)
{
extern int bdb_exists;
if (!bdb_exists)
return (0);
__asm("int $3");
return (1);
}
static inline void
disable_intr(void)
{
__asm __volatile("cli");
}
static inline void
enable_intr(void)
{
__asm __volatile("sti");
}
/*
* This roundabout method of returning a u_char helps stop gcc-1.40 from
* generating unnecessary movzbl's.
*/
#define inb(port) ((u_char) u_int_inb(port))
static inline u_int
u_int_inb(u_int port)
{
u_char data;
/*
* We use %%dx and not %1 here because i/o is done at %dx and not at
* %edx, while gcc-2.2.2 generates inferior code (movw instead of movl)
* if we tell it to load (u_short) port.
*/
__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
return data;
}
static inline void
outb(u_int port, u_char data)
{
register u_char al asm("ax");
al = data; /* help gcc-1.40's register allocator */
__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
}
static inline void
tlbflush()
{
__asm __volatile("movl %%cr3, %%eax; movl %%eax, %%cr3" : : : "ax");
}
#else /* not __GNUC__ */
extern void insque __P((void *, void *));
extern void remque __P((void *));
int bdb __P((void));
void disable_intr __P((void));
void enable_intr __P((void));
u_char inb __P((u_int port));
void outb __P((u_int port, u_int data)); /* XXX - incompat */
#endif /* __GNUC__ */
void load_cr0 __P((u_int cr0));
u_int rcr0 __P((void));
void load_cr3(u_long);
u_long rcr3(void);
u_long rcr2(void);
void setidt __P((int, void (*)(), int, int));
extern u_long kvtop(void *);
extern void outw(int /*u_short*/, int /*u_short*/); /* XXX inline!*/
extern void outsb(int /*u_short*/, void *, size_t);
extern void outsw(int /*u_short*/, void *, size_t);
extern void insw(int /*u_short*/, void *, size_t);
extern void fillw(int /*u_short*/, void *, size_t);
extern void filli(int, void *, size_t);
#endif /* _MACHINE_CPUFUNC_H_ */
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