cmdline.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * cmdline.c: Kernel command line creation using ARCS argc/argv.
 *
 * Copyright (C) 1996 David S. Miller ([email protected])
 */
#include <linux/bug.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>

#include <asm/sgialib.h>
#include <asm/bootinfo.h>

#undef DEBUG_CMDLINE

static char *ignored[] = {
    "ConsoleIn=",
    "ConsoleOut=",
    "SystemPartition=",
    "OSLoader=",
    "OSLoadPartition=",
    "OSLoadFilename=",
    "OSLoadOptions="
};

static char *used_arc[][2] = {
    { "OSLoadPartition=", "root=" },
    { "OSLoadOptions=", "" }
};

static char * __init move_firmware_args(char* cp)
{
    char *s;
    int actr, i;

    actr = 1; /* Always ignore argv[0] */

    while (actr < prom_argc) {
        for(i = 0; i < ARRAY_SIZE(used_arc); i++) {
            int len = strlen(used_arc[i][0]);

            if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
            /* Ok, we want it. First append the replacement... */
                strcat(cp, used_arc[i][1]);
                cp += strlen(used_arc[i][1]);
                /* ... and now the argument */
                s = strchr(prom_argv(actr), '=');
                if (s) {
                    s++;
                    strcpy(cp, s);
                    cp += strlen(s);
                }
                *cp++ = ' ';
                break;
            }
        }
        actr++;
    }

    return cp;
}

void __init prom_init_cmdline(void)
{
    char *cp;
    int actr, i;

    actr = 1; /* Always ignore argv[0] */

    cp = arcs_cmdline;
    /*
     * Move ARC variables to the beginning to make sure they can be
     * overridden by later arguments.
     */
    cp = move_firmware_args(cp);

    while (actr < prom_argc) {
        for (i = 0; i < ARRAY_SIZE(ignored); i++) {
            int len = strlen(ignored[i]);

            if (!strncmp(prom_argv(actr), ignored[i], len))
                goto pic_cont;
        }
        /* Ok, we want it. */
        strcpy(cp, prom_argv(actr));
        cp += strlen(prom_argv(actr));
        *cp++ = ' ';

    pic_cont:
        actr++;
    }

    if (cp != arcs_cmdline)     /* get rid of trailing space */
        --cp;
    *cp = '\0';

#ifdef DEBUG_CMDLINE
    printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline);
#endif
}