a4353b3b5e
of "__volatile". Note also that the original mods that were submitted by me were as a result of a discussion between various FreeBSD contributors. Submitted by: peter@haywire.dialix.com (Peter Wemm)
145 lines
5.1 KiB
C
145 lines
5.1 KiB
C
/*-
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* Copyright (c) 1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: spl.h,v 1.9 1995/08/08 04:50:50 dyson Exp $
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*/
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#ifndef _MACHINE_IPL_H_
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#define _MACHINE_IPL_H_
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#include <machine/ipl.h> /* XXX "machine" means cpu for i386 */
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/*
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* Software interrupt bit numbers in priority order. The priority only
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* determines which swi will be dispatched next; a higher priority swi
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* may be dispatched when a nested h/w interrupt handler returns.
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*/
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#define SWI_TTY (NHWI + 0)
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#define SWI_NET (NHWI + 1)
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#define SWI_CLOCK 30
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#define SWI_AST 31
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/*
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* Corresponding interrupt-pending bits for ipending.
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*/
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#define SWI_TTY_PENDING (1 << SWI_TTY)
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#define SWI_NET_PENDING (1 << SWI_NET)
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#define SWI_CLOCK_PENDING (1 << SWI_CLOCK)
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#define SWI_AST_PENDING (1 << SWI_AST)
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/*
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* Corresponding interrupt-disable masks for cpl. The ordering is now by
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* inclusion (where each mask is considered as a set of bits). Everything
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* except SWI_AST_MASK includes SWI_CLOCK_MASK so that softclock() doesn't
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* run while other swi handlers are running and timeout routines can call
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* swi handlers. Everything includes SWI_AST_MASK so that AST's are masked
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* until just before return to user mode.
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*/
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#define SWI_TTY_MASK (SWI_TTY_PENDING | SWI_CLOCK_MASK)
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#define SWI_NET_MASK (SWI_NET_PENDING | SWI_CLOCK_MASK)
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#define SWI_CLOCK_MASK (SWI_CLOCK_PENDING | SWI_AST_MASK)
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#define SWI_AST_MASK SWI_AST_PENDING
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#define SWI_MASK (~HWI_MASK)
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#ifndef LOCORE
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extern unsigned bio_imask; /* group of interrupts masked with splbio() */
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extern unsigned cpl; /* current priority level mask */
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extern volatile unsigned idelayed; /* interrupts to become pending */
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extern volatile unsigned ipending; /* active interrupts masked by cpl */
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extern unsigned net_imask; /* group of interrupts masked with splimp() */
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extern unsigned stat_imask; /* interrupts masked with splstatclock() */
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extern unsigned tty_imask; /* group of interrupts masked with spltty() */
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/*
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* ipending has to be volatile so that it is read every time it is accessed
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* in splx() and spl0(), but we don't want it to be read nonatomically when
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* it is changed. Pretending that ipending is a plain int happens to give
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* suitable atomic code for "ipending |= constant;".
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*/
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#define setdelayed() (*(unsigned *)&ipending |= loadandclear(&idelayed))
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#define setsoftast() (*(unsigned *)&ipending |= SWI_AST_PENDING)
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#define setsoftclock() (*(unsigned *)&ipending |= SWI_CLOCK_PENDING)
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#define setsoftnet() (*(unsigned *)&ipending |= SWI_NET_PENDING)
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#define setsofttty() (*(unsigned *)&ipending |= SWI_TTY_PENDING)
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#define schedsofttty() (*(unsigned *)&idelayed |= SWI_TTY_PENDING)
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void unpend_V __P((void));
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#ifdef __GNUC__
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void splz __P((void));
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#define GENSPL(name, set_cpl) \
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static __inline int name(void) \
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{ \
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unsigned x; \
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\
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__asm __volatile("":::"memory"); \
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x = cpl; \
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set_cpl; \
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return (x); \
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}
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GENSPL(splbio, cpl |= bio_imask)
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GENSPL(splclock, cpl = HWI_MASK | SWI_MASK)
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GENSPL(splhigh, cpl = HWI_MASK | SWI_MASK)
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GENSPL(splimp, cpl |= net_imask)
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GENSPL(splnet, cpl |= SWI_NET_MASK)
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GENSPL(splsoftclock, cpl = SWI_CLOCK_MASK)
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GENSPL(splsofttty, cpl |= SWI_TTY_MASK)
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GENSPL(splstatclock, cpl |= stat_imask)
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GENSPL(spltty, cpl |= tty_imask)
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static __inline void
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spl0(void)
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{
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cpl = SWI_AST_MASK;
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if (ipending & ~SWI_AST_MASK)
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splz();
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}
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static __inline void
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splx(int ipl)
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{
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cpl = ipl;
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if (ipending & ~ipl)
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splz();
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}
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#endif /* __GNUC__ */
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#endif /* !LOCORE */
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#endif /* !_MACHINE_IPL_H_ */
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