arch/mips/au1000/common/prom.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *    PROM library initialisation code, assuming a version of
   5  *    pmon is the boot code.
   6  *
   7  * Copyright 2000,2001 MontaVista Software Inc.
   8  * Author: MontaVista Software, Inc.
   9  *              ppopov@mvista.com or source@mvista.com
  10  *
  11  * This file was derived from Carsten Langgaard's
  12  * arch/mips/mips-boards/xx files.
  13  *
  14  * Carsten Langgaard, carstenl@mips.com
  15  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
  16  *
  17  *  This program is free software; you can redistribute  it and/or modify it
  18  *  under  the terms of  the GNU General  Public License as published by the
  19  *  Free Software Foundation;  either version 2 of the  License, or (at your
  20  *  option) any later version.
  21  *
  22  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  23  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  24  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  25  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  26  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  28  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  29  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  30  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  *  You should have received a copy of the  GNU General Public License along
  34  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  35  *  675 Mass Ave, Cambridge, MA 02139, USA.
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/kernel.h>
  40 #include <linux/init.h>
  41 #include <linux/string.h>
  42
  43 #include <asm/bootinfo.h>
  44
  45 /* #define DEBUG_CMDLINE */
  46
  47 extern int prom_argc;
  48 extern char **prom_argv, **prom_envp;
  49
  50 typedef struct
  51 {
  52     char *name;
  53 /*    char *val; */
  54 }t_env_var;
  55
  56
  57 char * prom_getcmdline(void)
  58 {
  59         return &(arcs_cmdline[0]);
  60 }
  61
  62 void  prom_init_cmdline(void)
  63 {
  64         char *cp;
  65         int actr;
  66
  67         actr = 1; /* Always ignore argv[0] */
  68
  69         cp = &(arcs_cmdline[0]);
  70         while(actr < prom_argc) {
  71                 strcpy(cp, prom_argv[actr]);
  72                 cp += strlen(prom_argv[actr]);
  73                 *cp++ = ' ';
  74                 actr++;
  75         }
  76         if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */
  77                 --cp;
  78         *cp = '\0';
  79
  80 }
  81
  82
  83 char *prom_getenv(char *envname)
  84 {
  85         /*
  86          * Return a pointer to the given environment variable.
  87          * Environment variables are stored in the form of "memsize=64".
  88          */
  89
  90         t_env_var *env = (t_env_var *)prom_envp;
  91         int i;
  92
  93         i = strlen(envname);
  94
  95         while(env->name) {
  96                 if(strncmp(envname, env->name, i) == 0) {
  97                         return(env->name + strlen(envname) + 1);
  98                 }
  99                 env++;
 100         }
 101         return(NULL);
 102 }
 103
 104 inline unsigned char str2hexnum(unsigned char c)
 105 {
 106         if(c >= '0' && c <= '9')
 107                 return c - '0';
 108         if(c >= 'a' && c <= 'f')
 109                 return c - 'a' + 10;
 110         if(c >= 'A' && c <= 'F')
 111                 return c - 'A' + 10;
 112         return 0; /* foo */
 113 }
 114
 115 inline void str2eaddr(unsigned char *ea, unsigned char *str)
 116 {
 117         int i;
 118
 119         for(i = 0; i < 6; i++) {
 120                 unsigned char num;
 121
 122                 if((*str == '.') || (*str == ':'))
 123                         str++;
 124                 num = str2hexnum(*str++) << 4;
 125                 num |= (str2hexnum(*str++));
 126                 ea[i] = num;
 127         }
 128 }
 129
 130 int get_ethernet_addr(char *ethernet_addr)
 131 {
 132         char *ethaddr_str;
 133
 134         ethaddr_str = prom_getenv("ethaddr");
 135         if (!ethaddr_str) {
 136                 printk("ethaddr not set in boot prom\n");
 137                 return -1;
 138         }
 139         str2eaddr(ethernet_addr, ethaddr_str);
 140
 141 #if 0
 142         {
 143                 int i;
 144
 145         printk("get_ethernet_addr: ");
 146         for (i=0; i<5; i++)
 147                 printk("%02x:", (unsigned char)*(ethernet_addr+i));
 148         printk("%02x\n", *(ethernet_addr+i));
 149         }
 150 #endif
 151
 152         return 0;
 153 }
 154
 155 unsigned long __init prom_free_prom_memory(void)
 156 {
 157         return 0;
 158 }
 159
 160 EXPORT_SYMBOL(prom_getcmdline);
 161 EXPORT_SYMBOL(get_ethernet_addr);
 162 EXPORT_SYMBOL(str2eaddr);