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Change definitions of MCOUNT_ENTER and MCOUNT_EXIT to block interrupts

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via the CPSR rather than via splhigh() due to the overheads involved
in using splhigh()/splx(). (From Chris Demetriou).
This commit is contained in:
mark 1998-04-19 04:16:25 +00:00
parent fcc1093bee
commit 569be6d488
1 changed files with 8 additions and 5 deletions
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13
sys/arch/arm32/include/profile.h
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@ -1,4 +1,4 @@
/* $NetBSD: profile.h,v 1.7 1997/11/05 00:34:15 thorpej Exp $ */
/* $NetBSD: profile.h,v 1.8 1998/04/19 04:16:25 mark Exp $ */
/*
* Copyright (c) 1995-1996 Mark Brinicombe
@ -67,10 +67,13 @@
__asm__("ldmfd sp!, {r0-r3, pc}");
#ifdef _KERNEL
#include <machine/cpufunc.h>
/*
* Note that we assume splhigh() and splx() cannot call mcount()
* recursively.
* splhigh() and splx() are heavyweight, and call mcount(). Therefore
* we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
*
* We're lucky that the CPSR and 's' both happen to be 'int's.
*/
#define MCOUNT_ENTER s = splhigh()
#define MCOUNT_EXIT splx(s)
#define MCOUNT_ENTER s = SetCPSR(0x0080, 0x0080); /* set IRQ disable bit */
#define MCOUNT_EXIT SetCPSR(0xffffffff, s); /* restore old value */
#endif /* _KERNEL */