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Code Issues Releases Activity

Disable the direct call from hardclock() to softclock(). Support

Browse Source 
for it is incomplete and buggy.  There is no problem unless Xintr0()
is reentered or should be reentered, but high clock interrupt
frequencies for pcaudio cause Xintr0() to be reentered (or clock
ticks to be lost when Xintr0() should have been reentered but
wasn't), and we lose little by delaying the call to softclock().

Move declarations related to the clock driver to clock.h.

Move declarations related to the npx driver to npx.h.

Clean up the remaining declarations.
This commit is contained in:
Bruce Evans 1994-11-05 22:44:34 +00:00
parent c897ebc21a
commit c342b9faa3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=4173
2 changed files with 38 additions and 16 deletions
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27
sys/amd64/include/cpu.h
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
* $Id: cpu.h,v 1.14 1994/10/15 21:18:11 ache Exp $
* $Id: cpu.h,v 1.15 1994/10/18 03:37:31 ache Exp $
*/
#ifndef _MACHINE_CPU_H_
@ -59,7 +59,21 @@
#define CLKF_USERMODE(framep) (ISPL((framep)->cf_cs) == SEL_UPL)
#define CLKF_INTR(framep) (0)
#if 0
/*
* XXX splsoftclock() is very broken and barely worth fixing. It doesn't
* turn off the clock bit in imen or in the icu. (This is not a serious
* problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock()
* can take more than 62.5 usec so clock interrupts are lost.) It doesn't
* check for pending interrupts being unmasked. clkintr() and Xintr0()
* assume that the ipl is high when hardclock() returns. Our SWI_AST
* handling is efficient enough that little is gained by calling
* softclock() directly.
*/
#define CLKF_BASEPRI(framep) (((framep)->cf_ppl & ~SWI_AST_MASK) == 0)
#else
#define CLKF_BASEPRI(framep) (0)
#endif
#define CLKF_PC(framep) ((framep)->cf_eip)
/*
@ -110,15 +124,12 @@ struct cpu_nameclass {
}
#ifdef KERNEL
extern int want_resched; /* resched was called */
extern int cpu;
extern int cpu_class;
extern int cpu;
extern int cpu_class;
extern struct cpu_nameclass i386_cpus[];
extern int want_resched; /* resched was called */
int cpu_fork __P((struct proc *, struct proc *));
int npxdna __P((void));
void npxexit __P((struct proc *p));
void resettodr __P((void));
#endif
#endif /* !_MACHINE_CPU_H_ */

27
sys/i386/include/cpu.h
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
* $Id: cpu.h,v 1.14 1994/10/15 21:18:11 ache Exp $
* $Id: cpu.h,v 1.15 1994/10/18 03:37:31 ache Exp $
*/
#ifndef _MACHINE_CPU_H_
@ -59,7 +59,21 @@
#define CLKF_USERMODE(framep) (ISPL((framep)->cf_cs) == SEL_UPL)
#define CLKF_INTR(framep) (0)
#if 0
/*
* XXX splsoftclock() is very broken and barely worth fixing. It doesn't
* turn off the clock bit in imen or in the icu. (This is not a serious
* problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock()
* can take more than 62.5 usec so clock interrupts are lost.) It doesn't
* check for pending interrupts being unmasked. clkintr() and Xintr0()
* assume that the ipl is high when hardclock() returns. Our SWI_AST
* handling is efficient enough that little is gained by calling
* softclock() directly.
*/
#define CLKF_BASEPRI(framep) (((framep)->cf_ppl & ~SWI_AST_MASK) == 0)
#else
#define CLKF_BASEPRI(framep) (0)
#endif
#define CLKF_PC(framep) ((framep)->cf_eip)
/*
@ -110,15 +124,12 @@ struct cpu_nameclass {
}
#ifdef KERNEL
extern int want_resched; /* resched was called */
extern int cpu;
extern int cpu_class;
extern int cpu;
extern int cpu_class;
extern struct cpu_nameclass i386_cpus[];
extern int want_resched; /* resched was called */
int cpu_fork __P((struct proc *, struct proc *));
int npxdna __P((void));
void npxexit __P((struct proc *p));
void resettodr __P((void));
#endif
#endif /* !_MACHINE_CPU_H_ */