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      1 /*	$NetBSD: ld_at_virtio.c,v 1.5 2022/03/31 19:30:18 pgoyette Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2010 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: ld_at_virtio.c,v 1.5 2022/03/31 19:30:18 pgoyette Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/conf.h>
     33 #include <sys/device.h>
     34 #include <sys/bus.h>
     35 #include <sys/stat.h>
     36 #include <sys/disklabel.h>
     37 
     38 #include <rump-sys/kern.h>
     39 #include <rump-sys/vfs.h>
     40 
     41 #include "ioconf.c"
     42 
     43 RUMP_COMPONENT(RUMP_COMPONENT_DEV)
     44 {
     45 	extern const struct bdevsw ld_bdevsw;
     46 	extern const struct cdevsw ld_cdevsw;
     47 	devmajor_t bmaj = -1, cmaj = -1;
     48 	int error;
     49 
     50 	if ((error = devsw_attach("ld", &ld_bdevsw, &bmaj,
     51 	    &ld_cdevsw, &cmaj)) != 0)
     52 		panic("cannot attach ld: %d", error);
     53 
     54 	config_init_component(cfdriver_ioconf_ld_virtio,
     55 	    cfattach_ioconf_ld_virtio, cfdata_ioconf_ld_virtio);
     56 }
     57 
     58 /*
     59  * Pseudo-devfs.  Since creating device nodes is non-free, don't
     60  * speculatively create hundreds of them (= milliseconds slower
     61  * bootstrap).  Instead, after the probe is done, see which units
     62  * were found and create nodes only for them.
     63  */
     64 RUMP_COMPONENT(RUMP_COMPONENT_POSTINIT)
     65 {
     66 	int error, i;
     67 
     68 	for (i = 0; i < 10; i++) {
     69 		char bbase[] = "/dev/ldX";
     70 		char rbase[] = "/dev/rldX";
     71 
     72 		if (device_lookup(&ld_cd, i) == NULL)
     73 			break;
     74 
     75 		bbase[sizeof(bbase)-2] = '0' + i;
     76 		rbase[sizeof(rbase)-2] = '0' + i;
     77 
     78 		if ((error = rump_vfs_makedevnodes(S_IFBLK, bbase, 'a',
     79 		    bmaj, DISKMINOR(i, 0), 5)) != 0)
     80 			panic("cannot create cooked ld dev nodes: %d", error);
     81 		if ((error = rump_vfs_makedevnodes(S_IFCHR, rbase, 'a',
     82 		    cmaj, DISKMINOR(i, 0), 5)) != 0)
     83 			panic("cannot create raw ld dev nodes: %d", error);
     84 	}
     85 }
     86