1 /*
2 * idprom.c: Routines to load the idprom into kernel addresses and
3 * interpret the data contained within.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/types.h>
10 #include <linux/init.h>
11 #include <linux/export.h>
12
13 #include <asm/oplib.h>
14 #include <asm/idprom.h>
15
16 struct idprom *idprom;
17 EXPORT_SYMBOL(idprom);
18
19 static struct idprom idprom_buffer;
20
21 #ifdef CONFIG_SPARC32
22 #include <asm/machines.h> /* Fun with Sun released architectures. */
23
24 /* Here is the master table of Sun machines which use some implementation
25 * of the Sparc CPU and have a meaningful IDPROM machtype value that we
26 * know about. See asm-sparc/machines.h for empirical constants.
27 */
28 static struct Sun_Machine_Models Sun_Machines[] = {
29 /* First, Leon */
30 { .name = "Leon3 System-on-a-Chip", .id_machtype = (M_LEON | M_LEON3_SOC) },
31 /* Finally, early Sun4m's */
32 { .name = "Sun4m SparcSystem600", .id_machtype = (SM_SUN4M | SM_4M_SS60) },
33 { .name = "Sun4m SparcStation10/20", .id_machtype = (SM_SUN4M | SM_4M_SS50) },
34 { .name = "Sun4m SparcStation5", .id_machtype = (SM_SUN4M | SM_4M_SS40) },
35 /* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
36 { .name = "Sun4M OBP based system", .id_machtype = (SM_SUN4M_OBP | 0x0) } };
37
display_system_type(unsigned char machtype)38 static void __init display_system_type(unsigned char machtype)
39 {
40 char sysname[128];
41 register int i;
42
43 for (i = 0; i < ARRAY_SIZE(Sun_Machines); i++) {
44 if (Sun_Machines[i].id_machtype == machtype) {
45 if (machtype != (SM_SUN4M_OBP | 0x00) ||
46 prom_getproperty(prom_root_node, "banner-name",
47 sysname, sizeof(sysname)) <= 0)
48 printk(KERN_WARNING "TYPE: %s\n",
49 Sun_Machines[i].name);
50 else
51 printk(KERN_WARNING "TYPE: %s\n", sysname);
52 return;
53 }
54 }
55
56 prom_printf("IDPROM: Warning, bogus id_machtype value, 0x%x\n", machtype);
57 }
58 #else
display_system_type(unsigned char machtype)59 static void __init display_system_type(unsigned char machtype)
60 {
61 }
62 #endif
63 /* Calculate the IDPROM checksum (xor of the data bytes). */
calc_idprom_cksum(struct idprom * idprom)64 static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
65 {
66 unsigned char cksum, i, *ptr = (unsigned char *)idprom;
67
68 for (i = cksum = 0; i <= 0x0E; i++)
69 cksum ^= *ptr++;
70
71 return cksum;
72 }
73
74 /* Create a local IDPROM copy, verify integrity, and display information. */
idprom_init(void)75 void __init idprom_init(void)
76 {
77 prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
78
79 idprom = &idprom_buffer;
80
81 if (idprom->id_format != 0x01)
82 prom_printf("IDPROM: Warning, unknown format type!\n");
83
84 if (idprom->id_cksum != calc_idprom_cksum(idprom))
85 prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
86 idprom->id_cksum, calc_idprom_cksum(idprom));
87
88 display_system_type(idprom->id_machtype);
89
90 printk(KERN_WARNING "Ethernet address: %pM\n", idprom->id_ethaddr);
91 }
92