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 * cmdline.c: Kernel command line creation using ARCS argc/argv. 7 * 8 * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 9 */ 10 #include <linux/bug.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/string.h> 14 15 #include <asm/sgialib.h> 16 #include <asm/bootinfo.h> 17 18 #undef DEBUG_CMDLINE 19 20 static char *ignored[] = { 21 "ConsoleIn=", 22 "ConsoleOut=", 23 "SystemPartition=", 24 "OSLoader=", 25 "OSLoadPartition=", 26 "OSLoadFilename=", 27 "OSLoadOptions=" 28 }; 29 30 static char *used_arc[][2] = { 31 { "OSLoadPartition=", "root=" }, 32 { "OSLoadOptions=", "" } 33 }; 34 35 static char * __init move_firmware_args(char* cp) 36 { 37 char *s; 38 int actr, i; 39 40 actr = 1; /* Always ignore argv[0] */ 41 42 while (actr < prom_argc) { 43 for(i = 0; i < ARRAY_SIZE(used_arc); i++) { 44 int len = strlen(used_arc[i][0]); 45 46 if (!strncmp(prom_argv(actr), used_arc[i][0], len)) { 47 /* Ok, we want it. First append the replacement... */ 48 strcat(cp, used_arc[i][1]); 49 cp += strlen(used_arc[i][1]); 50 /* ... and now the argument */ 51 s = strchr(prom_argv(actr), '='); 52 if (s) { 53 s++; 54 strcpy(cp, s); 55 cp += strlen(s); 56 } 57 *cp++ = ' '; 58 break; 59 } 60 } 61 actr++; 62 } 63 64 return cp; 65 } 66 67 void __init prom_init_cmdline(void) 68 { 69 char *cp; 70 int actr, i; 71 72 actr = 1; /* Always ignore argv[0] */ 73 74 cp = arcs_cmdline; 75 /* 76 * Move ARC variables to the beginning to make sure they can be 77 * overridden by later arguments. 78 */ 79 cp = move_firmware_args(cp); 80 81 while (actr < prom_argc) { 82 for (i = 0; i < ARRAY_SIZE(ignored); i++) { 83 int len = strlen(ignored[i]); 84 85 if (!strncmp(prom_argv(actr), ignored[i], len)) 86 goto pic_cont; 87 } 88 /* Ok, we want it. */ 89 strcpy(cp, prom_argv(actr)); 90 cp += strlen(prom_argv(actr)); 91 *cp++ = ' '; 92 93 pic_cont: 94 actr++; 95 } 96 97 if (cp != arcs_cmdline) /* get rid of trailing space */ 98 --cp; 99 *cp = '\0'; 100 101 #ifdef DEBUG_CMDLINE 102 printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline); 103 #endif 104 } 105