/*- * Parts Copyright (c) 1995 Terrence R. Lambert * Copyright (c) 1995 Julian R. Elischer * 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. 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 Terrence R. Lambert. * 4. The name Terrence R. Lambert may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY Julian R. Elischer ``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 TERRENCE R. LAMBERT 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. * * $Id: kern_conf.c,v 1.58 1999/08/17 20:25:50 billf Exp $ */ #include "opt_devfs.h" #include #include #include #include #include #include #include #include #include #ifdef DEVFS #include #endif /* DEVFS */ #define cdevsw_ALLOCSTART (NUMCDEVSW/2) struct cdevsw *cdevsw[NUMCDEVSW]; static int bmaj2cmaj[NUMCDEVSW]; MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage"); #define DEVT_HASH 83 #define DEVT_STASH 50 static struct specinfo devt_stash[DEVT_STASH]; static SLIST_HEAD(devt_hash_head, specinfo) dev_hash[DEVT_HASH]; /* * Routine to convert from character to block device number. * * A minimal stub routine can always return NODEV. */ dev_t chrtoblk(dev_t dev) { struct cdevsw *cd; if((cd = devsw(dev)) != NULL) { if (cd->d_bmaj != -1) return(makebdev(cd->d_bmaj,minor(dev))); } return(NODEV); } struct cdevsw * devsw(dev_t dev) { if (dev->si_devsw) return (dev->si_devsw); return(cdevsw[major(dev)]); } /* * Add a cdevsw entry */ int cdevsw_add(struct cdevsw *newentry) { int i; static int setup; if (!setup) { for (i = 0; i < NUMCDEVSW; i++) if (!bmaj2cmaj[i]) bmaj2cmaj[i] = 254; setup++; } if (newentry->d_maj < 0 || newentry->d_maj >= NUMCDEVSW) { printf("%s: ERROR: driver has bogus cdevsw->d_maj = %d\n", newentry->d_name, newentry->d_maj); return EINVAL; } if (cdevsw[newentry->d_maj]) { printf("WARNING: \"%s\" is usurping \"%s\"'s cdevsw[]\n", newentry->d_name, cdevsw[newentry->d_maj]->d_name); } cdevsw[newentry->d_maj] = newentry; if (newentry->d_bmaj >= 0 && newentry->d_bmaj < NUMCDEVSW) { if (bmaj2cmaj[newentry->d_bmaj] != 254) { printf("WARNING: \"%s\" is usurping \"%s\"'s bmaj\n", newentry->d_name, cdevsw[bmaj2cmaj[newentry->d_bmaj]]->d_name); } bmaj2cmaj[newentry->d_bmaj] = newentry->d_maj; } return 0; } /* * Remove a cdevsw entry */ int cdevsw_remove(struct cdevsw *oldentry) { if (oldentry->d_maj < 0 || oldentry->d_maj >= NUMCDEVSW) { printf("%s: ERROR: driver has bogus cdevsw->d_maj = %d\n", oldentry->d_name, oldentry->d_maj); return EINVAL; } cdevsw[oldentry->d_maj] = NULL; if (oldentry->d_bmaj >= 0 && oldentry->d_bmaj < NUMCDEVSW) bmaj2cmaj[oldentry->d_bmaj] = 254; return 0; } int devsw_module_handler(module_t mod, int what, void* arg) { struct devsw_module_data* data = (struct devsw_module_data*) arg; int error = 0; switch (what) { case MOD_LOAD: error = cdevsw_add(data->cdevsw); if (!error && data->chainevh) error = data->chainevh(mod, what, data->chainarg); return error; case MOD_UNLOAD: if (data->chainevh) { error = data->chainevh(mod, what, data->chainarg); if (error) return error; } cdevsw_remove(data->cdevsw); return error; } if (data->chainevh) return data->chainevh(mod, what, data->chainarg); else return 0; } /* * dev_t and u_dev_t primitives */ int major(dev_t x) { if (x == NODEV) return NOUDEV; return((x->si_udev >> 8) & 0xff); } int minor(dev_t x) { if (x == NODEV) return NOUDEV; return(x->si_udev & 0xffff00ff); } int lminor(dev_t x) { int i; if (x == NODEV) return NOUDEV; i = minor(x); return ((i & 0xff) | (i >> 8)); } dev_t makebdev(int x, int y) { return (makedev(bmaj2cmaj[x], y)); } dev_t makedev(int x, int y) { struct specinfo *si; udev_t udev; int hash; static int stashed; udev = (x << 8) | y; hash = udev % DEVT_HASH; SLIST_FOREACH(si, &dev_hash[hash], si_hash) { if (si->si_udev == udev) return (si); } if (stashed >= DEVT_STASH) { MALLOC(si, struct specinfo *, sizeof(*si), M_DEVT, M_USE_RESERVE); } else { si = devt_stash + stashed++; } bzero(si, sizeof(*si)); si->si_udev = udev; si->si_bsize_phys = DEV_BSIZE; si->si_bsize_best = BLKDEV_IOSIZE; si->si_bsize_max = MAXBSIZE; if (y > 256) sprintf(si->si_name, "#%d/0x%x", x, y); else sprintf(si->si_name, "#%d/%d", x, y); SLIST_INSERT_HEAD(&dev_hash[hash], si, si_hash); return (si); } udev_t dev2udev(dev_t x) { if (x == NODEV) return NOUDEV; return (x->si_udev); } udev_t dev2budev(dev_t x) { if (x == NODEV) return NOUDEV; else return makeudev(devsw(x)->d_bmaj, minor(x)); } dev_t udev2dev(udev_t x, int b) { switch (b) { case 0: return makedev(umajor(x), uminor(x)); case 1: return makebdev(umajor(x), uminor(x)); default: Debugger("udev2dev(...,X)"); return NODEV; } } int uminor(udev_t dev) { return(dev & 0xffff00ff); } int umajor(udev_t dev) { return((dev & 0xff00) >> 8); } udev_t makeudev(int x, int y) { return ((x << 8) | y); } dev_t make_dev(struct cdevsw *devsw, int minor, uid_t uid, gid_t gid, int perms, char *fmt, ...) { dev_t dev; va_list ap; int i; dev = makedev(devsw->d_maj, minor); va_start(ap, fmt); i = kvprintf(fmt, NULL, dev->si_name, 32, ap); dev->si_name[i] = '\0'; va_end(ap); dev->si_devsw = devsw; #ifdef DEVFS dev->si_devfs = devfs_add_devswf(devsw, minor, DV_CHR, uid, gid, perms, dev->si_name); /* XXX HACK .. name may not start in 'r' */ if ((devsw->d_bmaj != -1) && (*dev->si_name == 'r') && ((devsw->d_flags & D_TYPEMASK) == D_DISK)) { dev->si_devfs = devfs_add_devswf(devsw, minor, DV_BLK, uid, gid, perms, dev->si_name + 1); } #endif /* DEVFS */ return (dev); } char * devtoname(dev_t dev) { return (dev->si_name); }