131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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*
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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.
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* Author: MontaVista Software, Inc. <source@mvista.com>
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*
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* This file was derived from Carsten Langgaard's
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* arch/mips/mips-boards/xx files.
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*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <asm/bootinfo.h>
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int prom_argc;
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char **prom_argv;
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char **prom_envp;
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void prom_init_cmdline(void)
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{
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int i;
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for (i = 1; i < prom_argc; i++) {
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strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
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if (i < (prom_argc - 1))
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strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
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}
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}
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char *prom_getenv(char *envname)
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{
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/*
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* 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;
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int i = strlen(envname);
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int yamon = (*env && strchr(*env, '=') == NULL);
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while (*env) {
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if (yamon) {
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if (strcmp(envname, *env++) == 0)
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return *env;
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} else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
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return *env + i + 1;
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env++;
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}
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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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}
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static inline void str2eaddr(unsigned char *ea, unsigned char *str)
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{
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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;
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num |= str2hexnum(*str++);
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ea[i] = num;
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}
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}
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int prom_get_ethernet_addr(char *ethernet_addr)
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{
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char *ethaddr_str;
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/* Check the environment variables first */
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ethaddr_str = prom_getenv("ethaddr");
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if (!ethaddr_str) {
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/* Check command line */
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ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
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if (!ethaddr_str)
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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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}
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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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{
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}
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