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File: [local] / sys / arch / sgi / sgi / mutex.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:07:50 2008 UTC (16 years, 6 months ago) by nbrk
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: mutex.c,v 1.2 2007/05/14 17:32:17 miod Exp $ */ /* * Copyright (c) 2004 Artur Grabowski <art@openbsd.org> * All rights reserved. * * 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. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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. */ #include <sys/param.h> #include <sys/mutex.h> #include <sys/systm.h> #include <machine/intr.h> #ifdef MULTIPROCESSOR #error This code needs more work #endif /* * Single processor systems don't need any mutexes, but they need the spl * raising semantics of the mutexes. */ void mtx_init(struct mutex *mtx, int wantipl) { mtx->mtx_lock = 0; /* We can't access imask[] here, since MUTEX_INITIALIZER can't. */ mtx->mtx_wantipl = wantipl; mtx->mtx_oldcpl = IPL_NONE; } void mtx_enter(struct mutex *mtx) { if (mtx->mtx_wantipl != IPL_NONE) mtx->mtx_oldcpl = splraise(imask[mtx->mtx_wantipl]); MUTEX_ASSERT_UNLOCKED(mtx); mtx->mtx_lock = 1; } void mtx_leave(struct mutex *mtx) { MUTEX_ASSERT_LOCKED(mtx); mtx->mtx_lock = 0; if (mtx->mtx_wantipl != IPL_NONE) splx(mtx->mtx_oldcpl); }