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Initial revision

/*	$OpenBSD: psl.h,v 1.6 2007/05/16 19:37:06 thib Exp $	*/
/*	$NetBSD: psl.h,v 1.5 1994/10/26 07:50:50 cgd Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)psl.h	8.1 (Berkeley) 6/10/93
 */

#ifndef	_M68K_PSL_H_
#define	_M68K_PSL_H_

/*
 * MC680x0 program status word
 */

#define	PSL_C		0x0001		/* carry bit */
#define	PSL_V		0x0002		/* overflow bit */
#define	PSL_Z		0x0004		/* zero bit */
#define	PSL_N		0x0008		/* negative bit */
#define	PSL_X		0x0010		/* extend bit */
#define	PSL_ALLCC	0x001F		/* all cc bits - unlikely */
#define	PSL_IPL0	0x0000		/* interrupt priority level 0 */
#define	PSL_IPL1	0x0100		/* interrupt priority level 1 */
#define	PSL_IPL2	0x0200		/* interrupt priority level 2 */
#define	PSL_IPL3	0x0300		/* interrupt priority level 3 */
#define	PSL_IPL4	0x0400		/* interrupt priority level 4 */
#define	PSL_IPL5	0x0500		/* interrupt priority level 5 */
#define	PSL_IPL6	0x0600		/* interrupt priority level 6 */
#define	PSL_IPL7	0x0700		/* interrupt priority level 7 */
#define	PSL_M		0x1000		/* master (kernel) sp vs intr sp */
#define	PSL_S		0x2000		/* supervisor enable bit */
/*	PSL_T0		0x4000		   ??? T0 on 68020, 8000 is T1 */
#define	PSL_T		0x8000		/* trace enable bit */

#define	PSL_LOWIPL	(PSL_S)
#define	PSL_HIGHIPL	(PSL_S | PSL_IPL7)
#define PSL_IPL		(PSL_IPL7)
#define	PSL_USER	(0)

#define	PSL_MBZ		0xFFFF58E0	/* must be zero bits */

#define	PSL_USERSET	(0)
#define	PSL_USERCLR	(PSL_S | PSL_IPL7 | PSL_MBZ)

#define	USERMODE(ps)	(((ps) & PSL_S) == 0)

#ifdef	_KERNEL

/* SPL asserts */
#ifdef DIAGNOSTIC
/*
 * Although this function is implemented in MI code, it must be in this MD
 * header because we don't want this header to include MI includes.
 */
void splassert_fail(int, int, const char *);
extern int splassert_ctl;
void splassert_check(int, const char *);
#define splassert(__wantipl)						\
do {									\
	if (splassert_ctl > 0) {					\
		splassert_check(__wantipl, __func__);			\
	}								\
} while (0)
#else
#define	splassert(wantipl)	do { /* nothing */ } while (0)
#endif

/*
 * Convert PSL values to CPU IPLs and vice-versa.
 */
#define	PSLTOIPL(x)		(((x) >> 8) & 0xf)
#define	IPLTOPSL(x)		((((x) & 0xf) << 8) | PSL_S)

/*
 * spl functions; all but spl0 are done in-line
 */

#define	_spl(s)								\
({									\
	register int _spl_r;						\
									\
	__asm __volatile ("clrl %0; movew sr,%0; movew %1,sr" :		\
	    "=&d" (_spl_r) : "di" (s));					\
	_spl_r;								\
})

#define	_splraise(s)							\
({									\
	register int _spl_r;						\
									\
	__asm __volatile ("						\
		clrl	d0					;	\
		movw	sr,d0					;	\
		movl	d0,%0					;	\
		andw	#0x700,d0				;	\
		movw	%1,d1					;	\
		andw	#0x700,d1				;	\
		cmpw	d0,d1					;	\
		jle	1f					;	\
		movw	%1,sr					;	\
	    1:"							:	\
		    "=&d" (_spl_r)				:	\
		    "di" (s)					:	\
		    "d0", "d1");					\
	_spl_r;								\
})

#endif	/* _KERNEL */

#endif	/* _M68K_PSL_H_ */