/*	$NetBSD: psl.h,v 1.11 1996/03/31 22:20:14 pk Exp $ */

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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) 6/11/93
 */

#ifndef PSR_IMPL
#if !defined(_LOCORE) && !defined(__ASSEMBLER__)
#include <machine/asm.h>
#endif
#include <machine/asi.h>
#include <machine/sic.h>

/*
 * SPARC Process Status Register (in psl.h for hysterical raisins).
 *
 * The picture in the Sun manuals looks like this:
 *	                                     1 1
 *	 31   28 27   24 23   20 19       14 3 2 11    8 7 6 5 4       0
 *	+-------+-------+-------+-----------+-+-+-------+-+-+-+---------+
 *	|  impl |  ver  |  icc  |  reserved |E|E|  pil  |S|P|E|   CWP   |
 *	|       |       |n z v c|           |C|F|       | |S|T|         |
 *	+-------+-------+-------+-----------+-+-+-------+-+-+-+---------+
 */

#define	PSR_IMPL	0xf0000000	/* implementation */
#define	PSR_VER		0x0f000000	/* version */
#define	PSR_ICC		0x00f00000	/* integer condition codes */
#define	PSR_N		0x00800000	/* negative */
#define	PSR_Z		0x00400000	/* zero */
#define	PSR_O		0x00200000	/* overflow */
#define	PSR_C		0x00100000	/* carry */
#define	PSR_EC		0x00002000	/* coprocessor enable */
#define	PSR_EF		0x00001000	/* FP enable */
#define	PSR_PIL		0x00000f00	/* interrupt level */
#define	PSR_S		0x00000080	/* supervisor (kernel) mode */
#define	PSR_PS		0x00000040	/* previous supervisor mode (traps) */
#define	PSR_ET		0x00000020	/* trap enable */
#define	PSR_CWP		0x0000001f	/* current window pointer */

#define	PSR_BITS "\20\16EC\15EF\10S\7PS\6ET"


#define SPL_SOFTCLOCK	128
#define SPL_NET		128
#define SPL_BIO		136
#define SPL_TTY		139
#define SPL_ZS		SPL_TTY
#define SPL_CLOCK	141
#define SPL_VME		142
#define SPL_PROF	143
#define SPL_IMP		145
#define SPL_HIGH	255

#if defined(_KERNEL) && !defined(_LOCORE)

extern unsigned int ssir;

static __inline int getpsr __P((void));
static __inline void setpsr __P((int));
static __inline int setpil0 __P((void));

/*
 * GCC pseudo-functions for manipulating PSR (primarily PIL field).
 */
static __inline int
getpsr ()
{
	int psr;

	__asm __volatile("rd %%psr,%0" : "=r" (psr));
	return (psr);
}

static __inline void
setpsr (newpsr)
     int newpsr;
{
	__asm __volatile("wr %0,0,%%psr" : : "r" (newpsr));
	__asm __volatile("nop");
	__asm __volatile("nop");
	__asm __volatile("nop");
}

static __inline int
setpil0 ()
{
	int psr, oldipl;

	/*
	 * wrpsr xors two values: we choose old psr and old ipl here,
	 * which gives us the same value as the old psr but with all
	 * the old PIL bits turned off.
	 */
	__asm __volatile("rd %%psr,%0" : "=r" (psr));
	oldipl = psr & PSR_PIL;
	__asm __volatile("wr %0,%1,%%psr" : : "r" (psr), "r" (oldipl));

	/*
	 * Three instructions must execute before we can depend
	 * on the bits to be changed.
	 */
	__asm __volatile("nop; nop; nop");
	return (oldipl);
}

static __inline int setpil (int newpil)
{
	int psr, oldipl;

	psr = getpsr ();
	oldipl = (psr & PSR_PIL) >> 8;
	setpsr ((psr & ~PSR_PIL) | ((newpil << 8) & PSR_PIL));
	return oldipl;
}

static __inline int
setpil15 (void)
{
	int psr;

	psr = getpsr ();
	setpsr (psr | PSR_PIL);
	return (psr & PSR_PIL) >> 8;
}

/*
 * PIL 1 through 14 can use this macro.
 * (spl0 and splhigh are special since they put all 0s or all 1s
 * into the ipl field.)
 */
#define	SPL(name, newspl) \
extern int name __P((void)); 

SPL(splsoftint, SPL_NET)
#define	splsoftclock	splsoftint
#define	splsoftnet	splsoftint

/* Block devices */
SPL(splbio, SPL_BIO)

/* network hardware interrupts are at level 6 */
SPL(splnet, SPL_NET)

/* tty input runs at software level 6 */
SPL(spltty, SPL_TTY)

/*
 * Memory allocation (must be as high as highest network, tty, or disk device)
 */
SPL(splimp, SPL_IMP)

SPL(splclock, SPL_CLOCK)
SPL(splstatclock, SPL_CLOCK)

/* zs hardware interrupts are at level 12 */
SPL(splzs, SPL_ZS)

SPL(splhigh, SPL_HIGH)

SPL(spl0, 0)

extern int splx (int newspl);

#endif /* KERNEL && !_LOCORE */

#endif /* PSR_IMPL */