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freebsd/sys/i386/include/spl.h
Rodney W. Grimes 26f9a76710 The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch.
Reviewed by:	Rodney W. Grimes
Submitted by:	John Dyson and David Greenman
1994-05-25 09:21:21 +00:00

108 lines
3.1 KiB
C

#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.
*/
#define SWI_TTY_MASK (SWI_TTY_PENDING | SWI_CLOCK_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
extern unsigned bio_imask; /* group of interrupts masked with splbio() */
extern unsigned cpl; /* current priority level mask */
extern unsigned high_imask; /* group of interrupts masked with splhigh() */
extern unsigned net_imask; /* group of interrupts masked with splimp() */
extern volatile unsigned ipending; /* active interrupts masked by cpl */
extern volatile unsigned netisr;
extern unsigned tty_imask; /* group of interrupts masked with spltty() */
/*
* ipending has to be volatile so that it is read every time it is accessed
* in splx() and spl0(), but we don't want it to be read nonatomically when
* it is changed. Pretending that ipending is a plain int happens to give
* suitable atomic code for "ipending |= constant;".
*/
#define setsoftast() (*(unsigned *)&ipending |= SWI_AST_PENDING)
#define setsoftclock() (*(unsigned *)&ipending |= SWI_CLOCK_PENDING)
#define setsoftnet() (*(unsigned *)&ipending |= SWI_NET_PENDING)
#define setsofttty() (*(unsigned *)&ipending |= SWI_TTY_PENDING)
void unpend_V __P((void));
#ifdef __GNUC__
void splz __P((void));
#define GENSPL(name, set_cpl) \
static __inline int name(void) \
{ \
unsigned x; \
\
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(splstatclock, 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(spltty, cpl |= tty_imask)
#define splnone() spl0()
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_ */