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/* $NetBSD: intr.h,v 1.5 1996/05/13 06:11:28 mycroft Exp $ */
/*
* Copyright (c) 1996 Charles M. Hannum. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef _I386_INTR_H_
#define _I386_INTR_H_
/* Interrupt priority `levels'; not mutually exclusive. */
#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 */
#define IPL_NONE 5 /* nothing */
#define IPL_HIGH 6 /* everything */
/* 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[7];
extern void Xspllower __P((void));
static __inline int splraise __P((int));
static __inline int spllower __P((int));
static __inline void splx __P((int));
static __inline void softintr __P((int));
/*
* 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 /* !_I386_INTR_H_ */
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