cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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idprom.c (2958B)

      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
     18struct idprom *idprom;
     19EXPORT_SYMBOL(idprom);
     20
     21static 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 */
     30static 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
     40static 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
     61static void __init display_system_type(unsigned char machtype)
     62{
     63}
     64#endif
     65
     66unsigned 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). */
     72static 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. */
     83void __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}