cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cmdline.c (2314B)

      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
     26static char *ignored[] = {
     27	"ConsoleIn=",
     28	"ConsoleOut=",
     29	"SystemPartition=",
     30	"OSLoader=",
     31	"OSLoadPartition=",
     32	"OSLoadFilename=",
     33	"OSLoadOptions="
     34};
     35
     36static char *used_arc[][2] = {
     37	{ "OSLoadPartition=", "root=" },
     38	{ "OSLoadOptions=", "" }
     39};
     40
     41static 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
     73void __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}