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      1 /*	$NetBSD: idprom.c,v 1.7 2008/04/28 20:23:37 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Glass, Gordon W. Ross, and Matthew Fredette.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Machine ID PROM - system type and serial number
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: idprom.c,v 1.7 2008/04/28 20:23:37 martin Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/device.h>
     42 #include <sys/kernel.h>
     43 
     44 #include <uvm/uvm_extern.h>
     45 
     46 #include <machine/autoconf.h>
     47 #include <machine/idprom.h>
     48 
     49 #include <sun2/sun2/machdep.h>
     50 #include <sun2/sun2/control.h>
     51 
     52 /*
     53  * This structure is what this driver is all about.
     54  * It is copied from the device early in startup.
     55  */
     56 struct idprom identity_prom;
     57 
     58 static int idprom_cksum(u_char *);
     59 static void idprom_get(u_char *);
     60 static int idprom_hostid(void);
     61 
     62 /*
     63  * Copy the IDPROM contents,
     64  * verify the checksum,
     65  * set the hostid...
     66  */
     67 void
     68 idprom_init(void)
     69 {
     70 
     71 	idprom_get((u_char *)&identity_prom);
     72 	if (idprom_cksum((u_char *) &identity_prom))
     73 		printf("idprom: bad checksum\n");
     74 	if (identity_prom.idp_format < 1)
     75 		printf("idprom: bad version\n");
     76 
     77 	cpu_machine_id = identity_prom.idp_machtype;
     78 	hostid = idprom_hostid();
     79 }
     80 
     81 static int
     82 idprom_cksum(u_char *p)
     83 {
     84 	int len, x;
     85 
     86 	len = IDPROM_CKSUM_SIZE;
     87 	x = 0;	/* xor of data */
     88 	do x ^= *p++;
     89 	while (--len > 0);
     90 	return (x);
     91 }
     92 
     93 static int
     94 idprom_hostid(void)
     95 {
     96 	struct idprom *idp;
     97 	union {
     98 		long l;
     99 		char c[4];
    100 	} hid;
    101 
    102 	/*
    103 	 * Construct the hostid from the idprom contents.
    104 	 * This appears to be the way SunOS does it.
    105 	 */
    106 	idp = &identity_prom;
    107 	hid.c[0] = idp->idp_machtype;
    108 	hid.c[1] = idp->idp_serialnum[0];
    109 	hid.c[2] = idp->idp_serialnum[1];
    110 	hid.c[3] = idp->idp_serialnum[2];
    111 	return (hid.l);
    112 }
    113 
    114 void
    115 idprom_etheraddr(u_char *eaddrp)
    116 {
    117 
    118 	memcpy(eaddrp, identity_prom.idp_etheraddr, 6);
    119 }
    120 
    121 /*
    122  * Machine specific stuff follows.
    123  */
    124 
    125 /*
    126  * Copy the IDPROM to memory.
    127  *
    128  * On the Sun2, this is called very early,
    129  * because we need the cputype.
    130  */
    131 static void
    132 idprom_get(u_char *dst)
    133 {
    134 	vaddr_t src;	/* control space address */
    135 	int len, x;
    136 
    137 	src = IDPROM_BASE;
    138 	len = IDPROM_SIZE;
    139 	do {
    140 		x = get_control_byte(src);
    141 		src += PAGE_SIZE;
    142 		*dst++ = x;
    143 	} while (--len > 0);
    144 }
    145 
    146