cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

prom.c (3824B)

      1/*
      2 *
      3 * BRIEF MODULE DESCRIPTION
      4 *    PROM library initialisation code, supports YAMON and U-Boot.
      5 *
      6 * Copyright 2000-2001, 2006, 2008 MontaVista Software Inc.
      7 * Author: MontaVista Software, Inc. <source@mvista.com>
      8 *
      9 * This file was derived from Carsten Langgaard's
     10 * arch/mips/mips-boards/xx files.
     11 *
     12 * Carsten Langgaard, carstenl@mips.com
     13 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
     14 *
     15 *  This program is free software; you can redistribute  it and/or modify it
     16 *  under  the terms of  the GNU General  Public License as published by the
     17 *  Free Software Foundation;  either version 2 of the  License, or (at your
     18 *  option) any later version.
     19 *
     20 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
     21 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
     22 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
     23 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
     24 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
     26 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     27 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
     28 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 *
     31 *  You should have received a copy of the  GNU General Public License along
     32 *  with this program; if not, write  to the Free Software Foundation, Inc.,
     33 *  675 Mass Ave, Cambridge, MA 02139, USA.
     34 */
     35
     36#include <linux/init.h>
     37#include <linux/kernel.h>
     38#include <linux/memblock.h>
     39#include <linux/sizes.h>
     40#include <linux/string.h>
     41
     42#include <asm/bootinfo.h>
     43
     44int prom_argc;
     45char **prom_argv;
     46char **prom_envp;
     47
     48void __init prom_init_cmdline(void)
     49{
     50	int i;
     51
     52	for (i = 1; i < prom_argc; i++) {
     53		strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
     54		if (i < (prom_argc - 1))
     55			strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
     56	}
     57}
     58
     59char *prom_getenv(char *envname)
     60{
     61	/*
     62	 * Return a pointer to the given environment variable.
     63	 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
     64	 */
     65
     66	char **env = prom_envp;
     67	int i = strlen(envname);
     68	int yamon = (*env && strchr(*env, '=') == NULL);
     69
     70	while (*env) {
     71		if (yamon) {
     72			if (strcmp(envname, *env++) == 0)
     73				return *env;
     74		} else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
     75			return *env + i + 1;
     76		env++;
     77	}
     78
     79	return NULL;
     80}
     81
     82void __init prom_init(void)
     83{
     84	unsigned char *memsize_str;
     85	unsigned long memsize;
     86
     87	prom_argc = (int)fw_arg0;
     88	prom_argv = (char **)fw_arg1;
     89	prom_envp = (char **)fw_arg2;
     90
     91	prom_init_cmdline();
     92
     93	memsize_str = prom_getenv("memsize");
     94	if (!memsize_str || kstrtoul(memsize_str, 0, &memsize))
     95		memsize = SZ_64M; /* minimum memsize is 64MB RAM */
     96
     97	memblock_add(0, memsize);
     98}
     99
    100static inline unsigned char str2hexnum(unsigned char c)
    101{
    102	if (c >= '0' && c <= '9')
    103		return c - '0';
    104	if (c >= 'a' && c <= 'f')
    105		return c - 'a' + 10;
    106	if (c >= 'A' && c <= 'F')
    107		return c - 'A' + 10;
    108
    109	return 0; /* foo */
    110}
    111
    112static inline void str2eaddr(unsigned char *ea, unsigned char *str)
    113{
    114	int i;
    115
    116	for (i = 0; i < 6; i++) {
    117		unsigned char num;
    118
    119		if ((*str == '.') || (*str == ':'))
    120			str++;
    121		num  = str2hexnum(*str++) << 4;
    122		num |= str2hexnum(*str++);
    123		ea[i] = num;
    124	}
    125}
    126
    127int __init prom_get_ethernet_addr(char *ethernet_addr)
    128{
    129	char *ethaddr_str;
    130
    131	/* Check the environment variables first */
    132	ethaddr_str = prom_getenv("ethaddr");
    133	if (!ethaddr_str) {
    134		/* Check command line */
    135		ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
    136		if (!ethaddr_str)
    137			return -1;
    138
    139		ethaddr_str += strlen("ethaddr=");
    140	}
    141
    142	str2eaddr(ethernet_addr, ethaddr_str);
    143
    144	return 0;
    145}