// SPDX-License-Identifier: GPL-2.0
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/*
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* idprom.c: Routines to load the idprom into kernel addresses and
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* interpret the data contained within.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/etherdevice.h>
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#include <asm/oplib.h>
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#include <asm/idprom.h>
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struct idprom *idprom;
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EXPORT_SYMBOL(idprom);
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static struct idprom idprom_buffer;
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#ifdef CONFIG_SPARC32
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#include <asm/machines.h> /* Fun with Sun released architectures. */
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/* Here is the master table of Sun machines which use some implementation
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* of the Sparc CPU and have a meaningful IDPROM machtype value that we
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* know about. See asm-sparc/machines.h for empirical constants.
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*/
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static struct Sun_Machine_Models Sun_Machines[] = {
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/* First, Leon */
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{ .name = "Leon3 System-on-a-Chip", .id_machtype = (M_LEON | M_LEON3_SOC) },
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/* Finally, early Sun4m's */
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{ .name = "Sun4m SparcSystem600", .id_machtype = (SM_SUN4M | SM_4M_SS60) },
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{ .name = "Sun4m SparcStation10/20", .id_machtype = (SM_SUN4M | SM_4M_SS50) },
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{ .name = "Sun4m SparcStation5", .id_machtype = (SM_SUN4M | SM_4M_SS40) },
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/* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
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{ .name = "Sun4M OBP based system", .id_machtype = (SM_SUN4M_OBP | 0x0) } };
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static void __init display_system_type(unsigned char machtype)
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{
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char sysname[128];
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register int i;
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for (i = 0; i < ARRAY_SIZE(Sun_Machines); i++) {
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if (Sun_Machines[i].id_machtype == machtype) {
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if (machtype != (SM_SUN4M_OBP | 0x00) ||
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prom_getproperty(prom_root_node, "banner-name",
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sysname, sizeof(sysname)) <= 0)
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printk(KERN_WARNING "TYPE: %s\n",
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Sun_Machines[i].name);
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else
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printk(KERN_WARNING "TYPE: %s\n", sysname);
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return;
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}
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}
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prom_printf("IDPROM: Warning, bogus id_machtype value, 0x%x\n", machtype);
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}
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#else
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static void __init display_system_type(unsigned char machtype)
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{
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}
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#endif
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unsigned char *arch_get_platform_mac_address(void)
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{
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return idprom->id_ethaddr;
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}
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/* Calculate the IDPROM checksum (xor of the data bytes). */
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static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
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{
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unsigned char cksum, i, *ptr = (unsigned char *)idprom;
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for (i = cksum = 0; i <= 0x0E; i++)
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cksum ^= *ptr++;
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return cksum;
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}
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/* Create a local IDPROM copy, verify integrity, and display information. */
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void __init idprom_init(void)
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{
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prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
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idprom = &idprom_buffer;
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if (idprom->id_format != 0x01)
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prom_printf("IDPROM: Warning, unknown format type!\n");
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if (idprom->id_cksum != calc_idprom_cksum(idprom))
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prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
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idprom->id_cksum, calc_idprom_cksum(idprom));
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display_system_type(idprom->id_machtype);
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printk(KERN_WARNING "Ethernet address: %pM\n", idprom->id_ethaddr);
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}
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