1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * idprom.c: Routines to load the idprom into kernel addresses and |
4 | * interpret the data contained within. |
5 | * |
6 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
7 | */ |
8 | |
9 | #include <linux/kernel.h> |
10 | #include <linux/types.h> |
11 | #include <linux/init.h> |
12 | #include <linux/export.h> |
13 | #include <linux/etherdevice.h> |
14 | |
15 | #include <asm/oplib.h> |
16 | #include <asm/idprom.h> |
17 | |
18 | struct idprom *idprom; |
19 | EXPORT_SYMBOL(idprom); |
20 | |
21 | static struct idprom idprom_buffer; |
22 | |
23 | #ifdef CONFIG_SPARC32 |
24 | #include <asm/machines.h> /* Fun with Sun released architectures. */ |
25 | |
26 | /* Here is the master table of Sun machines which use some implementation |
27 | * of the Sparc CPU and have a meaningful IDPROM machtype value that we |
28 | * know about. See asm-sparc/machines.h for empirical constants. |
29 | */ |
30 | static struct Sun_Machine_Models Sun_Machines[] = { |
31 | /* First, Leon */ |
32 | { .name = "Leon3 System-on-a-Chip" , .id_machtype = (M_LEON | M_LEON3_SOC) }, |
33 | /* Finally, early Sun4m's */ |
34 | { .name = "Sun4m SparcSystem600" , .id_machtype = (SM_SUN4M | SM_4M_SS60) }, |
35 | { .name = "Sun4m SparcStation10/20" , .id_machtype = (SM_SUN4M | SM_4M_SS50) }, |
36 | { .name = "Sun4m SparcStation5" , .id_machtype = (SM_SUN4M | SM_4M_SS40) }, |
37 | /* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */ |
38 | { .name = "Sun4M OBP based system" , .id_machtype = (SM_SUN4M_OBP | 0x0) } }; |
39 | |
40 | static void __init display_system_type(unsigned char machtype) |
41 | { |
42 | char sysname[128]; |
43 | register int i; |
44 | |
45 | for (i = 0; i < ARRAY_SIZE(Sun_Machines); i++) { |
46 | if (Sun_Machines[i].id_machtype == machtype) { |
47 | if (machtype != (SM_SUN4M_OBP | 0x00) || |
48 | prom_getproperty(prom_root_node, "banner-name" , |
49 | sysname, sizeof(sysname)) <= 0) |
50 | printk(KERN_WARNING "TYPE: %s\n" , |
51 | Sun_Machines[i].name); |
52 | else |
53 | printk(KERN_WARNING "TYPE: %s\n" , sysname); |
54 | return; |
55 | } |
56 | } |
57 | |
58 | prom_printf("IDPROM: Warning, bogus id_machtype value, 0x%x\n" , machtype); |
59 | } |
60 | #else |
61 | static void __init display_system_type(unsigned char machtype) |
62 | { |
63 | } |
64 | #endif |
65 | |
66 | unsigned char *arch_get_platform_mac_address(void) |
67 | { |
68 | return idprom->id_ethaddr; |
69 | } |
70 | |
71 | /* Calculate the IDPROM checksum (xor of the data bytes). */ |
72 | static unsigned char __init calc_idprom_cksum(struct idprom *idprom) |
73 | { |
74 | unsigned char cksum, i, *ptr = (unsigned char *)idprom; |
75 | |
76 | for (i = cksum = 0; i <= 0x0E; i++) |
77 | cksum ^= *ptr++; |
78 | |
79 | return cksum; |
80 | } |
81 | |
82 | /* Create a local IDPROM copy, verify integrity, and display information. */ |
83 | void __init idprom_init(void) |
84 | { |
85 | prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer)); |
86 | |
87 | idprom = &idprom_buffer; |
88 | |
89 | if (idprom->id_format != 0x01) |
90 | prom_printf("IDPROM: Warning, unknown format type!\n" ); |
91 | |
92 | if (idprom->id_cksum != calc_idprom_cksum(idprom)) |
93 | prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n" , |
94 | idprom->id_cksum, calc_idprom_cksum(idprom)); |
95 | |
96 | display_system_type(machtype: idprom->id_machtype); |
97 | |
98 | printk(KERN_WARNING "Ethernet address: %pM\n" , idprom->id_ethaddr); |
99 | } |
100 | |