1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. 7 */ 8 #include <linux/init.h> 9 #include <linux/kernel.h> 10 #include <linux/string.h> 11 12 #include <asm/addrspace.h> 13 #include <asm/fw/fw.h> 14 15 int fw_argc; 16 int *_fw_argv; 17 int *_fw_envp; 18 19 #ifndef CONFIG_HAVE_PLAT_FW_INIT_CMDLINE 20 void __init fw_init_cmdline(void) 21 { 22 int i; 23 24 /* Validate command line parameters. */ 25 if ((fw_arg0 >= CKSEG0) || (fw_arg1 < CKSEG0)) { 26 fw_argc = 0; 27 _fw_argv = NULL; 28 } else { 29 fw_argc = (fw_arg0 & 0x0000ffff); 30 _fw_argv = (int *)fw_arg1; 31 } 32 33 /* Validate environment pointer. */ 34 if (fw_arg2 < CKSEG0) 35 _fw_envp = NULL; 36 else 37 _fw_envp = (int *)fw_arg2; 38 39 for (i = 1; i < fw_argc; i++) { 40 strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE); 41 if (i < (fw_argc - 1)) 42 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE); 43 } 44 } 45 #endif 46 47 char * __init fw_getcmdline(void) 48 { 49 return &(arcs_cmdline[0]); 50 } 51 52 char *fw_getenv(char *envname) 53 { 54 char *result = NULL; 55 56 if (_fw_envp != NULL) { 57 /* 58 * Return a pointer to the given environment variable. 59 * YAMON uses "name", "value" pairs, while U-Boot uses 60 * "name=value". 61 */ 62 int i, yamon, index = 0; 63 64 yamon = (strchr(fw_envp(index), '=') == NULL); 65 i = strlen(envname); 66 67 while (fw_envp(index)) { 68 if (strncmp(envname, fw_envp(index), i) == 0) { 69 if (yamon) { 70 result = fw_envp(index + 1); 71 break; 72 } else if (fw_envp(index)[i] == '=') { 73 result = fw_envp(index) + i + 1; 74 break; 75 } 76 } 77 78 /* Increment array index. */ 79 if (yamon) 80 index += 2; 81 else 82 index += 1; 83 } 84 } 85 86 return result; 87 } 88 89 unsigned long fw_getenvl(char *envname) 90 { 91 unsigned long envl = 0UL; 92 char *str; 93 int tmp; 94 95 str = fw_getenv(envname); 96 if (str) { 97 tmp = kstrtoul(str, 0, &envl); 98 if (tmp) 99 envl = 0; 100 } 101 102 return envl; 103 } 104