mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
7baccf64d3
variables: don't depend on the compiler generating atomic code to set the variables - use inline asm to specify the atomic instruction(s) explicitly.
154 lines
5.6 KiB
C
154 lines
5.6 KiB
C
/*-
|
|
* Copyright (c) 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. 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.
|
|
*
|
|
* $Id: spl.h,v 1.14 1996/05/18 03:36:42 dyson Exp $
|
|
*/
|
|
|
|
#ifndef _MACHINE_IPL_H_
|
|
#define _MACHINE_IPL_H_
|
|
|
|
#include <machine/ipl.h> /* XXX "machine" means cpu for i386 */
|
|
|
|
/*
|
|
* Software interrupt bit numbers in priority order. The priority only
|
|
* determines which swi will be dispatched next; a higher priority swi
|
|
* may be dispatched when a nested h/w interrupt handler returns.
|
|
*/
|
|
#define SWI_TTY (NHWI + 0)
|
|
#define SWI_NET (NHWI + 1)
|
|
#define SWI_CLOCK 30
|
|
#define SWI_AST 31
|
|
|
|
/*
|
|
* Corresponding interrupt-pending bits for ipending.
|
|
*/
|
|
#define SWI_TTY_PENDING (1 << SWI_TTY)
|
|
#define SWI_NET_PENDING (1 << SWI_NET)
|
|
#define SWI_CLOCK_PENDING (1 << SWI_CLOCK)
|
|
#define SWI_AST_PENDING (1 << SWI_AST)
|
|
|
|
/*
|
|
* Corresponding interrupt-disable masks for cpl. The ordering is now by
|
|
* inclusion (where each mask is considered as a set of bits). Everything
|
|
* except SWI_AST_MASK includes SWI_CLOCK_MASK so that softclock() doesn't
|
|
* run while other swi handlers are running and timeout routines can call
|
|
* swi handlers. Everything includes SWI_AST_MASK so that AST's are masked
|
|
* until just before return to user mode. SWI_TTY_MASK includes SWI_NET_MASK
|
|
* in case tty interrupts are processed at splsofttty() for a tty that is in
|
|
* SLIP or PPP line discipline (this is weaker than merging net_imask with
|
|
* tty_imask in isa.c - splimp() must mask hard and soft tty interrupts, but
|
|
* spltty() apparently only needs to mask soft net interrupts).
|
|
*/
|
|
#define SWI_TTY_MASK (SWI_TTY_PENDING | SWI_CLOCK_MASK | SWI_NET_MASK)
|
|
#define SWI_NET_MASK (SWI_NET_PENDING | SWI_CLOCK_MASK)
|
|
#define SWI_CLOCK_MASK (SWI_CLOCK_PENDING | SWI_AST_MASK)
|
|
#define SWI_AST_MASK SWI_AST_PENDING
|
|
#define SWI_MASK (~HWI_MASK)
|
|
|
|
#ifndef LOCORE
|
|
|
|
/*
|
|
* cpl is preserved by interrupt handlers so it is effectively nonvolatile.
|
|
* ipending and idelayed are changed by interrupt handlers so they are
|
|
* volatile.
|
|
*/
|
|
extern unsigned bio_imask; /* group of interrupts masked with splbio() */
|
|
extern unsigned cpl; /* current priority level mask */
|
|
extern volatile unsigned idelayed; /* interrupts to become pending */
|
|
extern volatile unsigned ipending; /* active interrupts masked by cpl */
|
|
extern unsigned net_imask; /* group of interrupts masked with splimp() */
|
|
extern unsigned stat_imask; /* interrupts masked with splstatclock() */
|
|
extern unsigned tty_imask; /* group of interrupts masked with spltty() */
|
|
|
|
/*
|
|
* The volatile bitmap variables must be set atomically. This normally
|
|
* involves using a machine-dependent bit-set or `or' instruction.
|
|
*/
|
|
#define setdelayed() setbits(&ipending, loadandclear(&idelayed))
|
|
#define setsoftast() setbits(&ipending, SWI_AST_PENDING)
|
|
#define setsoftclock() setbits(&ipending, SWI_CLOCK_PENDING)
|
|
#define setsoftnet() setbits(&ipending, SWI_NET_PENDING)
|
|
#define setsofttty() setbits(&ipending, SWI_TTY_PENDING)
|
|
|
|
#define schedsofttty() setbits(&idelayed, SWI_TTY_PENDING)
|
|
#define schedsoftnet() setbits(&idelayed, SWI_NET_PENDING)
|
|
|
|
#define softclockpending() (ipending & SWI_CLOCK_PENDING)
|
|
|
|
#ifdef __GNUC__
|
|
|
|
void splz __P((void));
|
|
|
|
#define GENSPL(name, set_cpl) \
|
|
static __inline int name(void) \
|
|
{ \
|
|
unsigned x; \
|
|
\
|
|
__asm __volatile("" : : : "memory"); \
|
|
x = cpl; \
|
|
set_cpl; \
|
|
return (x); \
|
|
}
|
|
|
|
GENSPL(splbio, cpl |= bio_imask)
|
|
GENSPL(splclock, cpl = HWI_MASK | SWI_MASK)
|
|
GENSPL(splhigh, cpl = HWI_MASK | SWI_MASK)
|
|
GENSPL(splimp, cpl |= net_imask)
|
|
GENSPL(splnet, cpl |= SWI_NET_MASK)
|
|
GENSPL(splsoftclock, cpl = SWI_CLOCK_MASK)
|
|
GENSPL(splsofttty, cpl |= SWI_TTY_MASK)
|
|
GENSPL(splstatclock, cpl |= stat_imask)
|
|
GENSPL(spltty, cpl |= tty_imask)
|
|
GENSPL(splvm, cpl |= net_imask | bio_imask)
|
|
|
|
static __inline void
|
|
spl0(void)
|
|
{
|
|
cpl = SWI_AST_MASK;
|
|
if (ipending & ~SWI_AST_MASK)
|
|
splz();
|
|
}
|
|
|
|
static __inline void
|
|
splx(int ipl)
|
|
{
|
|
cpl = ipl;
|
|
if (ipending & ~ipl)
|
|
splz();
|
|
}
|
|
|
|
#endif /* __GNUC__ */
|
|
|
|
#endif /* !LOCORE */
|
|
|
|
#endif /* !_MACHINE_IPL_H_ */
|