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/module.h> 37 #include <linux/init.h> 38 #include <linux/string.h> 39 40 #include <asm/bootinfo.h> 41 42 int prom_argc; 43 char **prom_argv; 44 char **prom_envp; 45 46 char * __init_or_module prom_getcmdline(void) 47 { 48 return &(arcs_cmdline[0]); 49 } 50 51 void prom_init_cmdline(void) 52 { 53 char *cp; 54 int actr; 55 56 actr = 1; /* Always ignore argv[0] */ 57 58 cp = &(arcs_cmdline[0]); 59 while (actr < prom_argc) { 60 strcpy(cp, prom_argv[actr]); 61 cp += strlen(prom_argv[actr]); 62 *cp++ = ' '; 63 actr++; 64 } 65 if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */ 66 --cp; 67 if (prom_argc > 1) 68 *cp = '\0'; 69 } 70 71 char *prom_getenv(char *envname) 72 { 73 /* 74 * Return a pointer to the given environment variable. 75 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value". 76 */ 77 78 char **env = prom_envp; 79 int i = strlen(envname); 80 int yamon = (*env && strchr(*env, '=') == NULL); 81 82 while (*env) { 83 if (yamon) { 84 if (strcmp(envname, *env++) == 0) 85 return *env; 86 } else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=') 87 return *env + i + 1; 88 env++; 89 } 90 91 return NULL; 92 } 93 94 static inline unsigned char str2hexnum(unsigned char c) 95 { 96 if (c >= '0' && c <= '9') 97 return c - '0'; 98 if (c >= 'a' && c <= 'f') 99 return c - 'a' + 10; 100 if (c >= 'A' && c <= 'F') 101 return c - 'A' + 10; 102 103 return 0; /* foo */ 104 } 105 106 static inline void str2eaddr(unsigned char *ea, unsigned char *str) 107 { 108 int i; 109 110 for (i = 0; i < 6; i++) { 111 unsigned char num; 112 113 if ((*str == '.') || (*str == ':')) 114 str++; 115 num = str2hexnum(*str++) << 4; 116 num |= str2hexnum(*str++); 117 ea[i] = num; 118 } 119 } 120 121 int prom_get_ethernet_addr(char *ethernet_addr) 122 { 123 char *ethaddr_str; 124 char *argptr; 125 126 /* Check the environment variables first */ 127 ethaddr_str = prom_getenv("ethaddr"); 128 if (!ethaddr_str) { 129 /* Check command line */ 130 argptr = prom_getcmdline(); 131 ethaddr_str = strstr(argptr, "ethaddr="); 132 if (!ethaddr_str) 133 return -1; 134 135 ethaddr_str += strlen("ethaddr="); 136 } 137 138 str2eaddr(ethernet_addr, ethaddr_str); 139 140 return 0; 141 } 142 EXPORT_SYMBOL(prom_get_ethernet_addr); 143 144 void __init prom_free_prom_memory(void) 145 { 146 } 147