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 (4454B)

      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 * Sun3/3x models added by David Monro (davidm@psrg.cs.usyd.edu.au)
      8 */
      9
     10#include <linux/module.h>
     11#include <linux/kernel.h>
     12#include <linux/types.h>
     13#include <linux/init.h>
     14#include <linux/string.h>
     15
     16#include <asm/oplib.h>
     17#include <asm/idprom.h>
     18#include <asm/machines.h>  /* Fun with Sun released architectures. */
     19
     20struct idprom *idprom;
     21EXPORT_SYMBOL(idprom);
     22
     23static struct idprom idprom_buffer;
     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 */
     29static struct Sun_Machine_Models Sun_Machines[NUM_SUN_MACHINES] = {
     30/* First, Sun3's */
     31    { .name = "Sun 3/160 Series",	.id_machtype = (SM_SUN3 | SM_3_160) },
     32    { .name = "Sun 3/50",		.id_machtype = (SM_SUN3 | SM_3_50) },
     33    { .name = "Sun 3/260 Series",	.id_machtype = (SM_SUN3 | SM_3_260) },
     34    { .name = "Sun 3/110 Series",	.id_machtype = (SM_SUN3 | SM_3_110) },
     35    { .name = "Sun 3/60",		.id_machtype = (SM_SUN3 | SM_3_60) },
     36    { .name = "Sun 3/E",		.id_machtype = (SM_SUN3 | SM_3_E) },
     37/* Now, Sun3x's */
     38    { .name = "Sun 3/460 Series",	.id_machtype = (SM_SUN3X | SM_3_460) },
     39    { .name = "Sun 3/80",		.id_machtype = (SM_SUN3X | SM_3_80) },
     40/* Then, Sun4's */
     41// { .name = "Sun 4/100 Series",	.id_machtype = (SM_SUN4 | SM_4_110) },
     42// { .name = "Sun 4/200 Series",	.id_machtype = (SM_SUN4 | SM_4_260) },
     43// { .name = "Sun 4/300 Series",	.id_machtype = (SM_SUN4 | SM_4_330) },
     44// { .name = "Sun 4/400 Series",	.id_machtype = (SM_SUN4 | SM_4_470) },
     45/* And now, Sun4c's */
     46// { .name = "Sun4c SparcStation 1",	.id_machtype = (SM_SUN4C | SM_4C_SS1) },
     47// { .name = "Sun4c SparcStation IPC",	.id_machtype = (SM_SUN4C | SM_4C_IPC) },
     48// { .name = "Sun4c SparcStation 1+",	.id_machtype = (SM_SUN4C | SM_4C_SS1PLUS) },
     49// { .name = "Sun4c SparcStation SLC",	.id_machtype = (SM_SUN4C | SM_4C_SLC) },
     50// { .name = "Sun4c SparcStation 2",	.id_machtype = (SM_SUN4C | SM_4C_SS2) },
     51// { .name = "Sun4c SparcStation ELC",	.id_machtype = (SM_SUN4C | SM_4C_ELC) },
     52// { .name = "Sun4c SparcStation IPX",	.id_machtype = (SM_SUN4C | SM_4C_IPX) },
     53/* Finally, early Sun4m's */
     54// { .name = "Sun4m SparcSystem600",	.id_machtype = (SM_SUN4M | SM_4M_SS60) },
     55// { .name = "Sun4m SparcStation10/20",	.id_machtype = (SM_SUN4M | SM_4M_SS50) },
     56// { .name = "Sun4m SparcStation5",	.id_machtype = (SM_SUN4M | SM_4M_SS40) },
     57/* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
     58// { .name = "Sun4M OBP based system",	.id_machtype = (SM_SUN4M_OBP | 0x0) }
     59};
     60
     61static void __init display_system_type(unsigned char machtype)
     62{
     63	register int i;
     64
     65	for (i = 0; i < NUM_SUN_MACHINES; i++) {
     66		if(Sun_Machines[i].id_machtype == machtype) {
     67			if (machtype != (SM_SUN4M_OBP | 0x00))
     68				pr_info("TYPE: %s\n", Sun_Machines[i].name);
     69			else {
     70#if 0
     71				char sysname[128];
     72
     73				prom_getproperty(prom_root_node, "banner-name",
     74						 sysname, sizeof(sysname));
     75				pr_info("TYPE: %s\n", sysname);
     76#endif
     77			}
     78			return;
     79		}
     80	}
     81
     82	prom_printf("IDPROM: Bogus id_machtype value, 0x%x\n", machtype);
     83	prom_halt();
     84}
     85
     86void sun3_get_model(unsigned char* model)
     87{
     88	register int i;
     89
     90	for (i = 0; i < NUM_SUN_MACHINES; i++) {
     91		if(Sun_Machines[i].id_machtype == idprom->id_machtype) {
     92		        strcpy(model, Sun_Machines[i].name);
     93			return;
     94		}
     95	}
     96}
     97
     98
     99
    100/* Calculate the IDPROM checksum (xor of the data bytes). */
    101static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
    102{
    103	unsigned char cksum, i, *ptr = (unsigned char *)idprom;
    104
    105	for (i = cksum = 0; i <= 0x0E; i++)
    106		cksum ^= *ptr++;
    107
    108	return cksum;
    109}
    110
    111/* Create a local IDPROM copy, verify integrity, and display information. */
    112void __init idprom_init(void)
    113{
    114	prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
    115
    116	idprom = &idprom_buffer;
    117
    118	if (idprom->id_format != 0x01)  {
    119		prom_printf("IDPROM: Unknown format type!\n");
    120		prom_halt();
    121	}
    122
    123	if (idprom->id_cksum != calc_idprom_cksum(idprom)) {
    124		prom_printf("IDPROM: Checksum failure (nvram=%x, calc=%x)!\n",
    125			    idprom->id_cksum, calc_idprom_cksum(idprom));
    126		prom_halt();
    127	}
    128
    129	display_system_type(idprom->id_machtype);
    130
    131	pr_info("Ethernet address: %pM\n", idprom->id_ethaddr);
    132}