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/* $NetBSD: psl.h,v 1.26 1996/01/07 21:48:35 mycroft Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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 5.2 (Berkeley) 1/18/91
*/
#ifndef _I386_PSL_H_
#define _I386_PSL_H_
/*
* 386 processor status longword.
*/
#define PSL_C 0x00000001 /* carry flag */
#define PSL_PF 0x00000004 /* parity flag */
#define PSL_AF 0x00000010 /* auxiliary carry flag */
#define PSL_Z 0x00000040 /* zero flag */
#define PSL_N 0x00000080 /* sign flag */
#define PSL_T 0x00000100 /* trap flag */
#define PSL_I 0x00000200 /* interrupt enable flag */
#define PSL_D 0x00000400 /* direction flag */
#define PSL_V 0x00000800 /* overflow flag */
#define PSL_IOPL 0x00003000 /* i/o privilege level */
#define PSL_NT 0x00004000 /* nested task */
#define PSL_RF 0x00010000 /* resume flag */
#define PSL_VM 0x00020000 /* virtual 8086 mode */
#define PSL_AC 0x00040000 /* alignment check flag */
#define PSL_VIF 0x00080000 /* virtual interrupt enable flag */
#define PSL_VIP 0x00100000 /* virtual interrupt pending flag */
#define PSL_ID 0x00200000 /* identification flag */
#define PSL_MBO 0x00000002 /* must be one bits */
#define PSL_MBZ 0xffc08028 /* must be zero bits */
#define PSL_USERSET (PSL_MBO | PSL_I)
#ifdef VM86
#define PSL_USERSTATIC (PSL_MBO | PSL_MBZ | PSL_I | PSL_IOPL | PSL_VIF | PSL_VIP)
#else
#define PSL_USERSTATIC (PSL_MBO | PSL_MBZ | PSL_I | PSL_IOPL | PSL_VM | PSL_VIF | PSL_VIP)
#endif
#ifdef _KERNEL
/* Interrupt priority `levels'; not mutually exclusive. */
#define IPL_NONE -1
#define IPL_BIO 0 /* block I/O */
#define IPL_NET 1 /* network */
#define IPL_TTY 2 /* terminal */
#define IPL_CLOCK 3 /* clock */
#define IPL_IMP 4 /* memory allocation */
/* Interrupt sharing types. */
#define IST_NONE 0 /* none */
#define IST_PULSE 1 /* pulsed */
#define IST_EDGE 2 /* edge-triggered */
#define IST_LEVEL 3 /* level-triggered */
/* Soft interrupt masks. */
#define SIR_CLOCK 31
#define SIR_CLOCKMASK ((1 << SIR_CLOCK))
#define SIR_NET 30
#define SIR_NETMASK ((1 << SIR_NET) | SIR_CLOCKMASK)
#define SIR_TTY 29
#define SIR_TTYMASK ((1 << SIR_TTY) | SIR_CLOCKMASK)
#define SIR_ALLMASK (SIR_CLOCKMASK | SIR_NETMASK | SIR_TTYMASK)
#ifndef LOCORE
volatile int cpl, ipending, astpending;
int imask[5];
extern void Xspllower __P((void));
/*
* Add a mask to cpl, and return the old value of cpl.
*/
static __inline int
splraise(ncpl)
register int ncpl;
{
register int ocpl = cpl;
cpl = ocpl | ncpl;
return (ocpl);
}
/*
* Restore a value to cpl (unmasking interrupts). If any unmasked
* interrupts are pending, call Xspllower() to process them.
*/
static __inline void
splx(ncpl)
register int ncpl;
{
cpl = ncpl;
if (ipending & ~ncpl)
Xspllower();
}
/*
* Same as splx(), but we return the old value of spl, for the
* benefit of some splsoftclock() callers.
*/
static __inline int
spllower(ncpl)
register int ncpl;
{
register int ocpl = cpl;
cpl = ncpl;
if (ipending & ~ncpl)
Xspllower();
return (ocpl);
}
/*
* Hardware interrupt masks
*/
#define splbio() splraise(imask[IPL_BIO])
#define splnet() splraise(imask[IPL_NET])
#define spltty() splraise(imask[IPL_TTY])
#define splclock() splraise(imask[IPL_CLOCK])
#define splimp() splraise(imask[IPL_IMP])
#define splstatclock() splclock()
/*
* Software interrupt masks
*
* NOTE: splsoftclock() is used by hardclock() to lower the priority from
* clock to softclock before it calls softclock().
*/
#define splsoftclock() spllower(SIR_CLOCKMASK)
#define splsoftnet() splraise(SIR_NETMASK)
#define splsofttty() splraise(SIR_TTYMASK)
/*
* Miscellaneous
*/
#define splhigh() splraise(-1)
#define spl0() spllower(0)
/*
* Software interrupt registration
*
* We hand-code this to ensure that it's atomic.
*/
static __inline void
softintr(mask)
register int mask;
{
__asm __volatile("orl %0,_ipending" : : "ir" (mask));
}
#define setsoftast() (astpending = 1)
#define setsoftclock() softintr(1 << SIR_CLOCK)
#define setsoftnet() softintr(1 << SIR_NET)
#define setsofttty() softintr(1 << SIR_TTY)
#endif /* !LOCORE */
#endif /* _KERNEL */
#endif /* !_I386_PSL_H_ */
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