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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nvram.c (2221B)

      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
      7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
      8 * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
      9 */
     10
     11#define pr_fmt(fmt) "bcm63xx_nvram: " fmt
     12
     13#include <linux/bcm963xx_nvram.h>
     14#include <linux/init.h>
     15#include <linux/crc32.h>
     16#include <linux/export.h>
     17#include <linux/kernel.h>
     18#include <linux/if_ether.h>
     19
     20#include <bcm63xx_nvram.h>
     21
     22#define BCM63XX_DEFAULT_PSI_SIZE	64
     23
     24static struct bcm963xx_nvram nvram;
     25static int mac_addr_used;
     26
     27void __init bcm63xx_nvram_init(void *addr)
     28{
     29	u32 crc, expected_crc;
     30	u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff };
     31
     32	/* extract nvram data */
     33	memcpy(&nvram, addr, BCM963XX_NVRAM_V5_SIZE);
     34
     35	/* check checksum before using data */
     36	if (bcm963xx_nvram_checksum(&nvram, &expected_crc, &crc))
     37		pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
     38			expected_crc, crc);
     39
     40	/* Cable modems have a different NVRAM which is embedded in the eCos
     41	 * firmware and not easily extractible, give at least a MAC address
     42	 * pool.
     43	 */
     44	if (BCMCPU_IS_3368()) {
     45		memcpy(nvram.mac_addr_base, hcs_mac_addr, ETH_ALEN);
     46		nvram.mac_addr_count = 2;
     47	}
     48}
     49
     50u8 *bcm63xx_nvram_get_name(void)
     51{
     52	return nvram.name;
     53}
     54EXPORT_SYMBOL(bcm63xx_nvram_get_name);
     55
     56int bcm63xx_nvram_get_mac_address(u8 *mac)
     57{
     58	u8 *oui;
     59	int count;
     60
     61	if (mac_addr_used >= nvram.mac_addr_count) {
     62		pr_err("not enough mac addresses\n");
     63		return -ENODEV;
     64	}
     65
     66	memcpy(mac, nvram.mac_addr_base, ETH_ALEN);
     67	oui = mac + ETH_ALEN/2 - 1;
     68	count = mac_addr_used;
     69
     70	while (count--) {
     71		u8 *p = mac + ETH_ALEN - 1;
     72
     73		do {
     74			(*p)++;
     75			if (*p != 0)
     76				break;
     77			p--;
     78		} while (p != oui);
     79
     80		if (p == oui) {
     81			pr_err("unable to fetch mac address\n");
     82			return -ENODEV;
     83		}
     84	}
     85
     86	mac_addr_used++;
     87	return 0;
     88}
     89EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address);
     90
     91int bcm63xx_nvram_get_psi_size(void)
     92{
     93	if (nvram.psi_size > 0)
     94		return nvram.psi_size;
     95
     96	return BCM63XX_DEFAULT_PSI_SIZE;
     97}
     98EXPORT_SYMBOL(bcm63xx_nvram_get_psi_size);