/*
 * 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 1.6 1993/12/19 00:50:14 wollman Exp $
 */

#ifndef _MACHINE_CPUFUNC_H_
#define _MACHINE_CPUFUNC_H_ 1

#include <sys/cdefs.h>
#include <sys/types.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
int
imin(a, b)
	int a, b;
{

	return (a < b ? a : b);
}

static inline
int
imax(a, b)
	int a, b;
{

	return (a > b ? a : b);
}

static inline
unsigned int
min(a, b)
	unsigned int a, b;
{

	return (a < b ? a : b);
}

static inline
unsigned int
max(a, b)
	unsigned int a, b;
{

	return (a > b ? a : b);
}

static inline
long
lmin(a, b)
	long a, b;
{

	return (a < b ? a : b);
}

static inline
long
lmax(a, b)
	long a, b;
{

	return (a > b ? a : b);
}

static inline
unsigned long
ulmin(a, b)
	unsigned long a, b;
{

	return (a < b ? a : b);
}

static inline
unsigned long
ulmax(a, b)
	unsigned long a, b;
{

	return (a > b ? a : b);
}

static inline
int
ffs(mask)
	register long mask;
{
	register int bit;

	if (!mask)
		return(0);
	for (bit = 1;; ++bit) {
		if (mask&0x01)
			return(bit);
		mask >>= 1;
	}
}

static inline
int
bcmp(v1, v2, len)
	void *v1, *v2;
	register unsigned len;
{
	register u_char *s1 = v1, *s2 = v2;

	while (len--)
		if (*s1++ != *s2++)
			return (1);
	return (0);
}

static inline
size_t
strlen(s1)
	register const char *s1;
{
	register size_t len;

	for (len = 0; *s1++ != '\0'; len++)
		;
	return (len);
}

struct quehead {
	struct quehead *qh_link;
	struct quehead *qh_rlink;
};

static inline void
insque(void *a, void *b)
{
	register struct quehead *element = a, *head = b;
	element->qh_link = head->qh_link;
	head->qh_link = (struct quehead *)element;
	element->qh_rlink = (struct quehead *)head;
	((struct quehead *)(element->qh_link))->qh_rlink
	  = (struct quehead *)element;
}

static inline void
remque(void *a)
{
	register struct quehead *element = a;
	((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
	((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
	element->qh_rlink = 0;
}

#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 tlbflush(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);

#endif /* _MACHINE_CPUFUNC_H_ */