111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* cmdline.c: Kernel command line creation using ARCS argc/argv.
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*
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* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/bug.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <asm/sgialib.h>
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#include <asm/bootinfo.h>
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#undef DEBUG_CMDLINE
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/*
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* A 32-bit ARC PROM pass arguments and environment as 32-bit pointer.
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* These macro take care of sign extension.
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*/
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#define prom_argv(index) ((char *) (long)argv[(index)])
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static char *ignored[] = {
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"ConsoleIn=",
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"ConsoleOut=",
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"SystemPartition=",
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"OSLoader=",
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"OSLoadPartition=",
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"OSLoadFilename=",
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"OSLoadOptions="
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};
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static char *used_arc[][2] = {
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{ "OSLoadPartition=", "root=" },
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{ "OSLoadOptions=", "" }
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};
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static char __init *move_firmware_args(int argc, LONG *argv, char *cp)
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{
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char *s;
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int actr, i;
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actr = 1; /* Always ignore argv[0] */
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while (actr < argc) {
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for(i = 0; i < ARRAY_SIZE(used_arc); i++) {
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int len = strlen(used_arc[i][0]);
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if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
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/* Ok, we want it. First append the replacement... */
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strcat(cp, used_arc[i][1]);
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cp += strlen(used_arc[i][1]);
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/* ... and now the argument */
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s = strchr(prom_argv(actr), '=');
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if (s) {
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s++;
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strcpy(cp, s);
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cp += strlen(s);
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}
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*cp++ = ' ';
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break;
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}
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}
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actr++;
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}
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return cp;
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}
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void __init prom_init_cmdline(int argc, LONG *argv)
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{
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char *cp;
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int actr, i;
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actr = 1; /* Always ignore argv[0] */
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cp = arcs_cmdline;
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/*
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* Move ARC variables to the beginning to make sure they can be
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* overridden by later arguments.
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*/
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cp = move_firmware_args(argc, argv, cp);
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while (actr < argc) {
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for (i = 0; i < ARRAY_SIZE(ignored); i++) {
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int len = strlen(ignored[i]);
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if (!strncmp(prom_argv(actr), ignored[i], len))
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goto pic_cont;
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}
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/* Ok, we want it. */
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strcpy(cp, prom_argv(actr));
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cp += strlen(prom_argv(actr));
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*cp++ = ' ';
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pic_cont:
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actr++;
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}
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if (cp != arcs_cmdline) /* get rid of trailing space */
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--cp;
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*cp = '\0';
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#ifdef DEBUG_CMDLINE
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printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline);
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#endif
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}
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