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