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 size_t len; 46 47 actr = 1; /* Always ignore argv[0] */ 48 49 while (actr < argc) { 50 for (i = 0; i < ARRAY_SIZE(used_arc); i++) { 51 len = strlen(used_arc[i][0]); 52 53 if (!strncmp(prom_argv(actr), used_arc[i][0], len)) { 54 /* Ok, we want it. First append the replacement... */ 55 strcat(cp, used_arc[i][1]); 56 cp += strlen(used_arc[i][1]); 57 /* ... and now the argument */ 58 s = strchr(prom_argv(actr), '='); 59 if (s) { 60 s++; 61 len = strlen(s); 62 memcpy(cp, s, len + 1); 63 cp += len; 64 } 65 *cp++ = ' '; 66 break; 67 } 68 } 69 actr++; 70 } 71 72 return cp; 73 } 74 75 void __init prom_init_cmdline(int argc, LONG *argv) 76 { 77 char *cp; 78 int actr, i; 79 size_t len; 80 81 actr = 1; /* Always ignore argv[0] */ 82 83 cp = arcs_cmdline; 84 /* 85 * Move ARC variables to the beginning to make sure they can be 86 * overridden by later arguments. 87 */ 88 cp = move_firmware_args(argc, argv, cp); 89 90 while (actr < argc) { 91 for (i = 0; i < ARRAY_SIZE(ignored); i++) { 92 len = strlen(ignored[i]); 93 if (!strncmp(prom_argv(actr), ignored[i], len)) 94 goto pic_cont; 95 } 96 97 /* Ok, we want it. */ 98 len = strlen(prom_argv(actr)); 99 memcpy(cp, prom_argv(actr), len + 1); 100 cp += len; 101 *cp++ = ' '; 102 103 pic_cont: 104 actr++; 105 } 106 107 if (cp != arcs_cmdline) /* get rid of trailing space */ 108 --cp; 109 *cp = '\0'; 110 111 #ifdef DEBUG_CMDLINE 112 pr_debug("prom cmdline: %s\n", arcs_cmdline); 113 #endif 114 } 115