cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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uboot.c (2743B)

      1/*
      2 * uboot.c -- uboot arguments support
      3 *
      4 * This file is subject to the terms and conditions of the GNU General Public
      5 * License.  See the file COPYING in the main directory of this archive
      6 * for more details.
      7 */
      8
      9#include <linux/kernel.h>
     10#include <linux/sched.h>
     11#include <linux/delay.h>
     12#include <linux/interrupt.h>
     13#include <linux/fb.h>
     14#include <linux/module.h>
     15#include <linux/mm.h>
     16#include <linux/console.h>
     17#include <linux/errno.h>
     18#include <linux/string.h>
     19#include <linux/memblock.h>
     20#include <linux/seq_file.h>
     21#include <linux/init.h>
     22#include <linux/initrd.h>
     23#include <linux/root_dev.h>
     24#include <linux/rtc.h>
     25
     26#include <asm/setup.h>
     27#include <asm/irq.h>
     28#include <asm/machdep.h>
     29#include <asm/sections.h>
     30
     31/*
     32 * parse_uboot_commandline
     33 *
     34 * Copies u-boot commandline arguments and store them in the proper linux
     35 * variables.
     36 *
     37 * Assumes:
     38 *	_init_sp global contains the address in the stack pointer when the
     39 *	kernel starts (see head.S::_start)
     40 *
     41 *	U-Boot calling convention:
     42 *	(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
     43 *
     44 *	_init_sp can be parsed as such
     45 *
     46 *	_init_sp+00 = u-boot cmd after jsr into kernel (skip)
     47 *	_init_sp+04 = &kernel board_info (residual data)
     48 *	_init_sp+08 = &initrd_start
     49 *	_init_sp+12 = &initrd_end
     50 *	_init_sp+16 = &cmd_start
     51 *	_init_sp+20 = &cmd_end
     52 *
     53 *	This also assumes that the memory locations pointed to are still
     54 *	unmodified. U-boot places them near the end of external SDRAM.
     55 *
     56 * Argument(s):
     57 *	commandp = the linux commandline arg container to fill.
     58 *	size     = the sizeof commandp.
     59 *
     60 * Returns:
     61 */
     62static void __init parse_uboot_commandline(char *commandp, int size)
     63{
     64	extern unsigned long _init_sp;
     65	unsigned long *sp;
     66	unsigned long uboot_kbd;
     67	unsigned long uboot_initrd_start, uboot_initrd_end;
     68	unsigned long uboot_cmd_start, uboot_cmd_end;
     69
     70	sp = (unsigned long *)_init_sp;
     71	uboot_kbd = sp[1];
     72	uboot_initrd_start = sp[2];
     73	uboot_initrd_end = sp[3];
     74	uboot_cmd_start = sp[4];
     75	uboot_cmd_end = sp[5];
     76
     77	if (uboot_cmd_start && uboot_cmd_end)
     78		strncpy(commandp, (const char *)uboot_cmd_start, size);
     79#if defined(CONFIG_BLK_DEV_INITRD)
     80	if (uboot_initrd_start && uboot_initrd_end &&
     81	    (uboot_initrd_end > uboot_initrd_start)) {
     82		initrd_start = uboot_initrd_start;
     83		initrd_end = uboot_initrd_end;
     84		ROOT_DEV = Root_RAM0;
     85		pr_info("initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
     86	}
     87#endif /* if defined(CONFIG_BLK_DEV_INITRD) */
     88}
     89
     90__init void process_uboot_commandline(char *commandp, int size)
     91{
     92	int len, n;
     93
     94	n = strnlen(commandp, size);
     95	commandp += n;
     96	len = size - n;
     97	if (len) {
     98		/* Add the whitespace separator */
     99		*commandp++ = ' ';
    100		len--;
    101	}
    102
    103	parse_uboot_commandline(commandp, len);
    104	commandp[len - 1] = 0;
    105}