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 void __init prom_init_cmdline(void) 47 { 48 int i; 49 50 for (i = 1; i < prom_argc; i++) { 51 strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE); 52 if (i < (prom_argc - 1)) 53 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE); 54 } 55 } 56 57 char *prom_getenv(char *envname) 58 { 59 /* 60 * Return a pointer to the given environment variable. 61 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value". 62 */ 63 64 char **env = prom_envp; 65 int i = strlen(envname); 66 int yamon = (*env && strchr(*env, '=') == NULL); 67 68 while (*env) { 69 if (yamon) { 70 if (strcmp(envname, *env++) == 0) 71 return *env; 72 } else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=') 73 return *env + i + 1; 74 env++; 75 } 76 77 return NULL; 78 } 79 80 static inline unsigned char str2hexnum(unsigned char c) 81 { 82 if (c >= '0' && c <= '9') 83 return c - '0'; 84 if (c >= 'a' && c <= 'f') 85 return c - 'a' + 10; 86 if (c >= 'A' && c <= 'F') 87 return c - 'A' + 10; 88 89 return 0; /* foo */ 90 } 91 92 static inline void str2eaddr(unsigned char *ea, unsigned char *str) 93 { 94 int i; 95 96 for (i = 0; i < 6; i++) { 97 unsigned char num; 98 99 if ((*str == '.') || (*str == ':')) 100 str++; 101 num = str2hexnum(*str++) << 4; 102 num |= str2hexnum(*str++); 103 ea[i] = num; 104 } 105 } 106 107 int __init prom_get_ethernet_addr(char *ethernet_addr) 108 { 109 char *ethaddr_str; 110 111 /* Check the environment variables first */ 112 ethaddr_str = prom_getenv("ethaddr"); 113 if (!ethaddr_str) { 114 /* Check command line */ 115 ethaddr_str = strstr(arcs_cmdline, "ethaddr="); 116 if (!ethaddr_str) 117 return -1; 118 119 ethaddr_str += strlen("ethaddr="); 120 } 121 122 str2eaddr(ethernet_addr, ethaddr_str); 123 124 return 0; 125 } 126 127 void __init prom_free_prom_memory(void) 128 { 129 } 130