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 /* 21 * A 32-bit ARC PROM pass arguments and environment as 32-bit pointer. 22 * These macro take care of sign extension. 23 */ 24 #define prom_argv(index) ((char *) (long)argv[(index)]) 25 26 static char *ignored[] = { 27 "ConsoleIn=", 28 "ConsoleOut=", 29 "SystemPartition=", 30 "OSLoader=", 31 "OSLoadPartition=", 32 "OSLoadFilename=", 33 "OSLoadOptions=" 34 }; 35 36 static char *used_arc[][2] = { 37 { "OSLoadPartition=", "root=" }, 38 { "OSLoadOptions=", "" } 39 }; 40 41 static char __init *move_firmware_args(int argc, LONG *argv, char *cp) 42 { 43 char *s; 44 int actr, i; 45 46 actr = 1; /* Always ignore argv[0] */ 47 48 while (actr < argc) { 49 for(i = 0; i < ARRAY_SIZE(used_arc); i++) { 50 int len = strlen(used_arc[i][0]); 51 52 if (!strncmp(prom_argv(actr), used_arc[i][0], len)) { 53 /* Ok, we want it. First append the replacement... */ 54 strcat(cp, used_arc[i][1]); 55 cp += strlen(used_arc[i][1]); 56 /* ... and now the argument */ 57 s = strchr(prom_argv(actr), '='); 58 if (s) { 59 s++; 60 strcpy(cp, s); 61 cp += strlen(s); 62 } 63 *cp++ = ' '; 64 break; 65 } 66 } 67 actr++; 68 } 69 70 return cp; 71 } 72 73 void __init prom_init_cmdline(int argc, LONG *argv) 74 { 75 char *cp; 76 int actr, i; 77 78 actr = 1; /* Always ignore argv[0] */ 79 80 cp = arcs_cmdline; 81 /* 82 * Move ARC variables to the beginning to make sure they can be 83 * overridden by later arguments. 84 */ 85 cp = move_firmware_args(argc, argv, cp); 86 87 while (actr < argc) { 88 for (i = 0; i < ARRAY_SIZE(ignored); i++) { 89 int len = strlen(ignored[i]); 90 91 if (!strncmp(prom_argv(actr), ignored[i], len)) 92 goto pic_cont; 93 } 94 /* Ok, we want it. */ 95 strcpy(cp, prom_argv(actr)); 96 cp += strlen(prom_argv(actr)); 97 *cp++ = ' '; 98 99 pic_cont: 100 actr++; 101 } 102 103 if (cp != arcs_cmdline) /* get rid of trailing space */ 104 --cp; 105 *cp = '\0'; 106 107 #ifdef DEBUG_CMDLINE 108 printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline); 109 #endif 110 } 111