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 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 59 static void __init display_system_type(unsigned char machtype) 60 { 61 } 62 #endif 63 /* Calculate the IDPROM checksum (xor of the data bytes). */ 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. */ 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