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Implement CPU spinlocks. Compile-tested only.

This commit is contained in:
gmcgarry 2002-09-16 09:12:50 +00:00
parent a2e5c0f036
commit 9fdf5b4b9e
1 changed files with 55 additions and 4 deletions
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59
sys/arch/sh3/include/lock.h
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@ -1,11 +1,11 @@
/* $NetBSD: lock.h,v 1.3 2002/03/17 17:55:25 uch Exp $ */
/* $NetBSD: lock.h,v 1.4 2002/09/16 09:12:50 gmcgarry Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
* by Gregory McGarry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -45,7 +45,58 @@
typedef __volatile int __cpu_simple_lock_t;
#define __SIMPLELOCK_LOCKED 1
#define __SIMPLELOCK_LOCKED 0x80
#define __SIMPLELOCK_UNLOCKED 0
static __inline void __cpu_simple_lock_init __P((__cpu_simple_lock_t *))
__attribute__((__unused__));
static __inline void __cpu_simple_lock __P((__cpu_simple_lock_t *))
__attribute__((__unused__));
static __inline int __cpu_simple_lock_try __P((__cpu_simple_lock_t *))
__attribute__((__unused__));
static __inline void __cpu_simple_unlock __P((__cpu_simple_lock_t *))
__attribute__((__unused__));
static __inline void
__cpu_simple_lock_init(__cpu_simple_lock_t *alp)
{
*alp = __SIMPLELOCK_UNLOCKED;
}
static __inline void
__cpu_simple_lock(__cpu_simple_lock_t *alp)
{
__asm __volatile(
"1: tas.b %0 \n"
" bf 1b \n"
: "=m" (*alp));
}
static __inline int
__cpu_simple_lock_try(__cpu_simple_lock_t *alp)
{
int __rv;
__asm __volatile(
" mov #1, r1 \n"
" mov.l r1, %1 \n"
" tas.b %0 \n"
" bt 1f \n"
" mov #0, r1 \n"
" mov.l r1, %1 \n"
"1: \n"
: "=m" (*alp), "=m" (__rv) :: "r1");
return (__rv);
}
static __inline void
__cpu_simple_unlock(__cpu_simple_lock_t *alp)
{
*alp = __SIMPLELOCK_UNLOCKED;
}
#endif /* !_SH3_LOCK_H_ */