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Implement spinlocks as subroutines instead of inlines. 

Add SPINLOCK_SPIN_HOOK; the VAX has low-priority IPIs like Alpha.
This commit is contained in:
ragge 2001-06-03 15:10:11 +00:00
parent 6e219aa5a7
commit 8d7b76581f
1 changed files with 55 additions and 6 deletions
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61
sys/arch/vax/include/lock.h
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@ -1,4 +1,4 @@
/* $NetBSD: lock.h,v 1.5 2000/07/01 06:41:06 matt Exp $ */
/* $NetBSD: lock.h,v 1.6 2001/06/03 15:10:11 ragge Exp $ */
/*
* Copyright (c) 2000 Ludd, University of Lule}, Sweden.
@ -33,29 +33,51 @@
#ifndef _VAX_LOCK_H_
#define _VAX_LOCK_H_
typedef __volatile int __cpu_simple_lock_t;
typedef __volatile int __cpu_simple_lock_t;
#define __SIMPLELOCK_LOCKED 1
#define __SIMPLELOCK_UNLOCKED 0
#define __SIMPLELOCK_LOCKED 1
#define __SIMPLELOCK_UNLOCKED 0
static __inline void
__cpu_simple_lock_init(__cpu_simple_lock_t *alp)
{
*alp = __SIMPLELOCK_UNLOCKED;
__asm__ __volatile ("movl %0,r1;jsb Sunlock"
: /* No output */
: "g"(alp)
: "r1","cc","memory");
#if 0
__asm__ __volatile ("bbcci $0, %0, 1f;1:"
: /* No output */
: "m"(*alp));
#endif
}
static __inline void
__cpu_simple_lock(__cpu_simple_lock_t *alp)
{
__asm__ __volatile ("movl %0,r1;jsb Slock"
: /* No output */
: "g"(alp)
: "r0","r1","cc","memory");
#if 0
__asm__ __volatile ("1:;bbssi $0, %0, 1b"
: /* No output */
: "m"(*alp));
#endif
}
static __inline void
__cpu_simple_unlock(__cpu_simple_lock_t *alp)
{
*alp = __SIMPLELOCK_UNLOCKED;
__asm__ __volatile ("movl %0,r1;jsb Sunlock"
: /* No output */
: "g"(alp)
: "r1","cc","memory");
#if 0
__asm__ __volatile ("bbcci $0, %0, 1f;1:"
: /* No output */
: "m"(*alp));
#endif
}
static __inline int
@ -63,11 +85,38 @@ __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
{
int ret;
__asm__ __volatile ("movl %1,r1;jsb Slocktry;movl r0,%0"
: "=&r"(ret)
: "g"(alp)
: "r0","r1","cc","memory");
#if 0
__asm__ __volatile ("movl $0,%0;bbssi $0,%1,1f;incl %0;1:"
: "=&r"(ret)
: "m"(*alp));
#endif
return ret;
}
#if defined(MULTIPROCESSOR)
/*
* On the Vax, interprocessor interrupts can come in at device priority
* level or lower. This can cause some problems while waiting for r/w
* spinlocks from a high'ish priority level: IPIs that come in will not
* be processed. This can lead to deadlock.
*
* This hook allows IPIs to be processed while a spinlock's interlock
* is released.
*/
#define SPINLOCK_SPIN_HOOK \
do { \
struct cpu_info *__ci = curcpu(); \
\
if (__ci->ci_ipimsgs != 0) { \
/* printf("CPU %lu has IPIs pending\n", \
__ci->ci_cpuid); */ \
cpu_handle_ipi(); \
} \
} while (0)
#endif /* MULTIPROCESSOR */
#endif /* _VAX_LOCK_H_ */