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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 ([email protected])
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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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	size_t len;
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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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			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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					len = strlen(s);
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					memcpy(cp, s, len + 1);
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					cp += len;
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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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	size_t len;
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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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			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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		len = strlen(prom_argv(actr));
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		memcpy(cp, prom_argv(actr), len + 1);
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		cp += len;
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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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	pr_debug("prom cmdline: %s\n", arcs_cmdline);
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#endif
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}
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