prom.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:4k
- /*
- *
- * BRIEF MODULE DESCRIPTION
- * PROM library initialisation code, assuming a version of
- * pmon is the boot code.
- *
- * Copyright 2000,2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- * ppopov@mvista.com or source@mvista.com
- *
- * 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.
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/string.h>
- #include <asm/bootinfo.h>
- /* #define DEBUG_CMDLINE */
- char arcs_cmdline[CL_SIZE];
- extern int prom_argc;
- extern char **prom_argv, **prom_envp;
- typedef struct
- {
- char *name;
- /* char *val; */
- }t_env_var;
- char * prom_getcmdline(void)
- {
- return &(arcs_cmdline[0]);
- }
- void prom_init_cmdline(void)
- {
- char *cp;
- int actr;
- actr = 1; /* Always ignore argv[0] */
- cp = &(arcs_cmdline[0]);
- while(actr < prom_argc) {
- strcpy(cp, prom_argv[actr]);
- cp += strlen(prom_argv[actr]);
- *cp++ = ' ';
- actr++;
- }
- if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */
- --cp;
- *cp = ' ';
- }
- char *prom_getenv(char *envname)
- {
- /*
- * Return a pointer to the given environment variable.
- * Environment variables are stored in the form of "memsize=64".
- */
- t_env_var *env = (t_env_var *)prom_envp;
- int i;
- i = strlen(envname);
- while(env->name) {
- if(strncmp(envname, env->name, i) == 0) {
- return(env->name + strlen(envname) + 1);
- }
- env++;
- }
- return(NULL);
- }
- inline unsigned char str2hexnum(unsigned char c)
- {
- if(c >= '0' && c <= '9')
- return c - '0';
- if(c >= 'a' && c <= 'f')
- return c - 'a' + 10;
- return 0; /* foo */
- }
- inline void str2eaddr(unsigned char *ea, unsigned char *str)
- {
- int i;
- for(i = 0; i < 6; i++) {
- unsigned char num;
- if((*str == '.') || (*str == ':'))
- str++;
- num = str2hexnum(*str++) << 4;
- num |= (str2hexnum(*str++));
- ea[i] = num;
- }
- }
- int get_ethernet_addr(char *ethernet_addr)
- {
- int i;
- char *ethaddr_str;
- ethaddr_str = prom_getenv("ethaddr");
- if (!ethaddr_str) {
- printk("ethaddr not set in boot promn");
- return -1;
- }
- str2eaddr(ethernet_addr, ethaddr_str);
- #if 0
- printk("get_ethernet_addr: ");
- for (i=0; i<5; i++)
- printk("%02x:", (unsigned char)*(ethernet_addr+i));
- printk("%02xn", *(ethernet_addr+i));
- #endif
- return 0;
- }
- void prom_free_prom_memory (void) {}
- EXPORT_SYMBOL(prom_getcmdline);
- EXPORT_SYMBOL(get_ethernet_addr);