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(idprom->id_machtype); 97 98 printk(KERN_WARNING "Ethernet address: %pM\n", idprom->id_ethaddr); 99 } 100