File: [local] / sys / arch / i386 / include / lock.h (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:06:13 2008 UTC (16 years, 6 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
|
/* $OpenBSD: lock.h,v 1.5 2007/05/29 18:18:20 tom Exp $ */
/* $NetBSD: lock.h,v 1.1.2.2 2000/05/03 14:40:55 sommerfeld Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Machine-dependent spin lock operations.
*/
#ifndef _I386_LOCK_H_
#define _I386_LOCK_H_
typedef __volatile int __cpu_simple_lock_t;
#define __SIMPLELOCK_LOCKED 1
#define __SIMPLELOCK_UNLOCKED 0
/*
* compiler barrier: prevent reordering of instructions.
* XXX something similar will move to <sys/cdefs.h>
* or thereabouts.
* This prevents the compiler from reordering code around
* this "instruction", acting as a sequence point for code generation.
*/
#define __lockbarrier() __asm __volatile("": : :"memory")
#define SPINLOCK_SPIN_HOOK __asm __volatile("pause": : :"memory")
#ifdef LOCKDEBUG
extern void __cpu_simple_lock_init(__cpu_simple_lock_t *);
extern void __cpu_simple_lock(__cpu_simple_lock_t *);
extern int __cpu_simple_lock_try(__cpu_simple_lock_t *);
extern void __cpu_simple_unlock(__cpu_simple_lock_t *);
#else
#include <machine/atomic.h>
static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline void
__cpu_simple_lock_init(__cpu_simple_lock_t *lockp)
{
*lockp = __SIMPLELOCK_UNLOCKED;
__lockbarrier();
}
static __inline void
__cpu_simple_lock(__cpu_simple_lock_t *lockp)
{
while (i386_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
== __SIMPLELOCK_LOCKED)
SPINLOCK_SPIN_HOOK;
__lockbarrier();
}
static __inline int
__cpu_simple_lock_try(__cpu_simple_lock_t *lockp)
{
int r = (i386_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
== __SIMPLELOCK_UNLOCKED);
__lockbarrier();
return (r);
}
static __inline void
__cpu_simple_unlock(__cpu_simple_lock_t *lockp)
{
__lockbarrier();
*lockp = __SIMPLELOCK_UNLOCKED;
}
#endif /* !LOCKDEBUG */
#ifdef _KERNEL
extern int rw_cas_486(volatile unsigned long *, unsigned long, unsigned long);
#define rw_cas rw_cas_486
#endif
#endif /* _I386_LOCK_H_ */