prom.c 3.63 KB
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/*
 *
 * BRIEF MODULE DESCRIPTION
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 *    PROM library initialisation code, supports YAMON and U-Boot.
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 *
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 * Copyright 2000-2001, 2006, 2008 MontaVista Software Inc.
 * Author: MontaVista Software, Inc. <source@mvista.com>
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 *
 * This file was derived from Carsten Langgaard's
 * arch/mips/mips-boards/xx files.
 *
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
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#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>

#include <asm/bootinfo.h>

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int prom_argc;
char **prom_argv;
char **prom_envp;
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char * __init_or_module prom_getcmdline(void)
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{
	return &(arcs_cmdline[0]);
}

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void prom_init_cmdline(void)
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{
	char *cp;
	int actr;

	actr = 1; /* Always ignore argv[0] */

	cp = &(arcs_cmdline[0]);
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	while (actr < prom_argc) {
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		strcpy(cp, prom_argv[actr]);
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		cp += strlen(prom_argv[actr]);
		*cp++ = ' ';
		actr++;
	}
	if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */
		--cp;
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	if (prom_argc > 1)
		*cp = '\0';
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}

char *prom_getenv(char *envname)
{
	/*
	 * Return a pointer to the given environment variable.
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	 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
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	 */

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	char **env = prom_envp;
	int i = strlen(envname);
	int yamon = (*env && strchr(*env, '=') == NULL);

	while (*env) {
		if (yamon) {
			if (strcmp(envname, *env++) == 0)
				return *env;
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		} else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
			return *env + i + 1;
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		env++;
	}
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	return NULL;
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}

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static inline unsigned char str2hexnum(unsigned char c)
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{
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	if (c >= '0' && c <= '9')
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		return c - '0';
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	if (c >= 'a' && c <= 'f')
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		return c - 'a' + 10;
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	if (c >= 'A' && c <= 'F')
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		return c - 'A' + 10;
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	return 0; /* foo */
}

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static inline void str2eaddr(unsigned char *ea, unsigned char *str)
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{
	int i;

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	for (i = 0; i < 6; i++) {
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		unsigned char num;

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		if ((*str == '.') || (*str == ':'))
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			str++;
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		num  = str2hexnum(*str++) << 4;
		num |= str2hexnum(*str++);
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		ea[i] = num;
	}
}

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int prom_get_ethernet_addr(char *ethernet_addr)
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{
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	char *ethaddr_str;
	char *argptr;
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	/* Check the environment variables first */
	ethaddr_str = prom_getenv("ethaddr");
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	if (!ethaddr_str) {
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		/* Check command line */
		argptr = prom_getcmdline();
		ethaddr_str = strstr(argptr, "ethaddr=");
		if (!ethaddr_str)
			return -1;
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		ethaddr_str += strlen("ethaddr=");
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	}
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	str2eaddr(ethernet_addr, ethaddr_str);
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	return 0;
}
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EXPORT_SYMBOL(prom_get_ethernet_addr);
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void __init prom_free_prom_memory(void)
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{
}