10Sstevel@tonic-gate /*
20Sstevel@tonic-gate  * CDDL HEADER START
30Sstevel@tonic-gate  *
40Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
50Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
60Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
70Sstevel@tonic-gate  * with the License.
80Sstevel@tonic-gate  *
90Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
100Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
110Sstevel@tonic-gate  * See the License for the specific language governing permissions
120Sstevel@tonic-gate  * and limitations under the License.
130Sstevel@tonic-gate  *
140Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
150Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
160Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
170Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
180Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
190Sstevel@tonic-gate  *
200Sstevel@tonic-gate  * CDDL HEADER END
210Sstevel@tonic-gate  */
220Sstevel@tonic-gate /*
230Sstevel@tonic-gate  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
240Sstevel@tonic-gate  * Use is subject to license terms.
250Sstevel@tonic-gate  */
260Sstevel@tonic-gate 
270Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
280Sstevel@tonic-gate 
290Sstevel@tonic-gate #include <stdio.h>
300Sstevel@tonic-gate #include <unistd.h>
310Sstevel@tonic-gate #include <stdlib.h>
320Sstevel@tonic-gate #include <sys/types.h>
330Sstevel@tonic-gate #include <alloca.h>
340Sstevel@tonic-gate #include <sys/stat.h>
350Sstevel@tonic-gate #include <malloc.h>
360Sstevel@tonic-gate #include <fcntl.h>
370Sstevel@tonic-gate #include <syslog.h>
380Sstevel@tonic-gate #include <mdesc.h>
390Sstevel@tonic-gate #include <string.h>
400Sstevel@tonic-gate #include <errno.h>
410Sstevel@tonic-gate 
420Sstevel@tonic-gate #define	MDESC_PATH	"/devices/pseudo/mdesc@0:mdesc"
430Sstevel@tonic-gate #define	SIZE	8192
440Sstevel@tonic-gate 
45*221Sla135387 static void mdesc_free(void *bufp, size_t size);
46*221Sla135387 
470Sstevel@tonic-gate md_t *
480Sstevel@tonic-gate mdesc_devinit(void)
490Sstevel@tonic-gate {
500Sstevel@tonic-gate 	int fh;
510Sstevel@tonic-gate 	uint8_t *bufp = NULL;
520Sstevel@tonic-gate 	int res;
530Sstevel@tonic-gate 	int size;
540Sstevel@tonic-gate 	int offset;
550Sstevel@tonic-gate 	md_t *mdp;
560Sstevel@tonic-gate 
570Sstevel@tonic-gate 	fh = open(MDESC_PATH, O_RDONLY, 0);
580Sstevel@tonic-gate 	if (fh < 0) {
590Sstevel@tonic-gate 		return (NULL);
600Sstevel@tonic-gate 	}
610Sstevel@tonic-gate 
620Sstevel@tonic-gate 	size = SIZE;	/* initial size */
630Sstevel@tonic-gate 	offset = 0;
640Sstevel@tonic-gate 
650Sstevel@tonic-gate 	bufp = malloc(size);
660Sstevel@tonic-gate 	if (NULL == bufp) {
670Sstevel@tonic-gate 		return (NULL);
680Sstevel@tonic-gate 	}
690Sstevel@tonic-gate 
700Sstevel@tonic-gate 		/* OK read until we get a EOF */
710Sstevel@tonic-gate 
720Sstevel@tonic-gate 	do {
730Sstevel@tonic-gate 		int len;
740Sstevel@tonic-gate 
750Sstevel@tonic-gate 		len = size - offset;
760Sstevel@tonic-gate 
770Sstevel@tonic-gate 		while (len < SIZE) {
780Sstevel@tonic-gate 			size += SIZE;
790Sstevel@tonic-gate 			bufp = realloc(bufp, size);
800Sstevel@tonic-gate 			if (NULL == bufp)
810Sstevel@tonic-gate 				return (NULL);
820Sstevel@tonic-gate 			len = size - offset;
830Sstevel@tonic-gate 		}
840Sstevel@tonic-gate 
850Sstevel@tonic-gate 		do {
860Sstevel@tonic-gate 			res = read(fh, bufp+offset, len);
870Sstevel@tonic-gate 		} while ((res < 0) && (errno == EAGAIN));
880Sstevel@tonic-gate 
890Sstevel@tonic-gate 		if (res < 0) {
900Sstevel@tonic-gate 			free(bufp);
910Sstevel@tonic-gate 			return (NULL);
920Sstevel@tonic-gate 		}
930Sstevel@tonic-gate 
940Sstevel@tonic-gate 		offset += res;
950Sstevel@tonic-gate 	} while (res > 0);
960Sstevel@tonic-gate 
970Sstevel@tonic-gate 	(void) close(fh);
980Sstevel@tonic-gate 
990Sstevel@tonic-gate 	bufp = realloc(bufp, offset);
1000Sstevel@tonic-gate 	if (NULL == bufp)
1010Sstevel@tonic-gate 		return (NULL);
1020Sstevel@tonic-gate 
103*221Sla135387 	mdp = md_init_intern((uint64_t *)bufp, malloc, mdesc_free);
1040Sstevel@tonic-gate 	if (NULL == mdp) {
1050Sstevel@tonic-gate 		free(bufp);
1060Sstevel@tonic-gate 		return (NULL);
1070Sstevel@tonic-gate 	}
1080Sstevel@tonic-gate 
1090Sstevel@tonic-gate 	return (mdp);
1100Sstevel@tonic-gate }
111*221Sla135387 
112*221Sla135387 /*ARGSUSED*/
113*221Sla135387 void
114*221Sla135387 mdesc_free(void *bufp, size_t size)
115*221Sla135387 {
116*221Sla135387 	free(bufp);
117*221Sla135387 }
118