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 (1965B)

      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 * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
      7 */
      8#include <linux/init.h>
      9#include <linux/kernel.h>
     10#include <linux/string.h>
     11
     12#include <asm/addrspace.h>
     13#include <asm/fw/fw.h>
     14
     15int fw_argc;
     16int *_fw_argv;
     17int *_fw_envp;
     18
     19#ifndef CONFIG_HAVE_PLAT_FW_INIT_CMDLINE
     20void __init fw_init_cmdline(void)
     21{
     22	int i;
     23
     24	/* Validate command line parameters. */
     25	if ((fw_arg0 >= CKSEG0) || (fw_arg1 < CKSEG0)) {
     26		fw_argc = 0;
     27		_fw_argv = NULL;
     28	} else {
     29		fw_argc = (fw_arg0 & 0x0000ffff);
     30		_fw_argv = (int *)fw_arg1;
     31	}
     32
     33	/* Validate environment pointer. */
     34	if (fw_arg2 < CKSEG0)
     35		_fw_envp = NULL;
     36	else
     37		_fw_envp = (int *)fw_arg2;
     38
     39	for (i = 1; i < fw_argc; i++) {
     40		strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
     41		if (i < (fw_argc - 1))
     42			strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
     43	}
     44}
     45#endif
     46
     47char * __init fw_getcmdline(void)
     48{
     49	return &(arcs_cmdline[0]);
     50}
     51
     52char *fw_getenv(char *envname)
     53{
     54	char *result = NULL;
     55
     56	if (_fw_envp != NULL) {
     57		/*
     58		 * Return a pointer to the given environment variable.
     59		 * YAMON uses "name", "value" pairs, while U-Boot uses
     60		 * "name=value".
     61		 */
     62		int i, yamon, index = 0;
     63
     64		yamon = (strchr(fw_envp(index), '=') == NULL);
     65		i = strlen(envname);
     66
     67		while (fw_envp(index)) {
     68			if (strncmp(envname, fw_envp(index), i) == 0) {
     69				if (yamon) {
     70					result = fw_envp(index + 1);
     71					break;
     72				} else if (fw_envp(index)[i] == '=') {
     73					result = fw_envp(index) + i + 1;
     74					break;
     75				}
     76			}
     77
     78			/* Increment array index. */
     79			if (yamon)
     80				index += 2;
     81			else
     82				index += 1;
     83		}
     84	}
     85
     86	return result;
     87}
     88
     89unsigned long fw_getenvl(char *envname)
     90{
     91	unsigned long envl = 0UL;
     92	char *str;
     93	int tmp;
     94
     95	str = fw_getenv(envname);
     96	if (str) {
     97		tmp = kstrtoul(str, 0, &envl);
     98		if (tmp)
     99			envl = 0;
    100	}
    101
    102	return envl;
    103}