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 (dm@engr.sgi.com) 9 */ 10 #include <linux/init.h> 11 #include <linux/kernel.h> 12 #include <linux/string.h> 13 14 #include <asm/sgialib.h> 15 #include <asm/bootinfo.h> 16 17 #undef DEBUG_CMDLINE 18 19 char * __init prom_getcmdline(void) 20 { 21 return arcs_cmdline; 22 } 23 24 static char *ignored[] = { 25 "ConsoleIn=", 26 "ConsoleOut=", 27 "SystemPartition=", 28 "OSLoader=", 29 "OSLoadPartition=", 30 "OSLoadFilename=", 31 "OSLoadOptions=" 32 }; 33 34 static char *used_arc[][2] = { 35 { "OSLoadPartition=", "root=" }, 36 { "OSLoadOptions=", "" } 37 }; 38 39 static char * __init move_firmware_args(char* cp) 40 { 41 char *s; 42 int actr, i; 43 44 actr = 1; /* Always ignore argv[0] */ 45 46 while (actr < prom_argc) { 47 for(i = 0; i < ARRAY_SIZE(used_arc); i++) { 48 int len = strlen(used_arc[i][0]); 49 50 if (!strncmp(prom_argv(actr), used_arc[i][0], len)) { 51 /* Ok, we want it. First append the replacement... */ 52 strcat(cp, used_arc[i][1]); 53 cp += strlen(used_arc[i][1]); 54 /* ... and now the argument */ 55 s = strchr(prom_argv(actr), '='); 56 if (s) { 57 s++; 58 strcpy(cp, s); 59 cp += strlen(s); 60 } 61 *cp++ = ' '; 62 break; 63 } 64 } 65 actr++; 66 } 67 68 return cp; 69 } 70 71 void __init prom_init_cmdline(void) 72 { 73 char *cp; 74 int actr, i; 75 76 actr = 1; /* Always ignore argv[0] */ 77 78 cp = arcs_cmdline; 79 /* 80 * Move ARC variables to the beginning to make sure they can be 81 * overridden by later arguments. 82 */ 83 cp = move_firmware_args(cp); 84 85 while (actr < prom_argc) { 86 for (i = 0; i < ARRAY_SIZE(ignored); i++) { 87 int len = strlen(ignored[i]); 88 89 if (!strncmp(prom_argv(actr), ignored[i], len)) 90 goto pic_cont; 91 } 92 /* Ok, we want it. */ 93 strcpy(cp, prom_argv(actr)); 94 cp += strlen(prom_argv(actr)); 95 *cp++ = ' '; 96 97 pic_cont: 98 actr++; 99 } 100 101 if (cp != arcs_cmdline) /* get rid of trailing space */ 102 --cp; 103 *cp = '\0'; 104 105 #ifdef DEBUG_CMDLINE 106 printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline); 107 #endif 108 } 109