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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sharpsl_param.c (1792B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Hardware parameter area specific to Sharp SL series devices
      4 *
      5 * Copyright (c) 2005 Richard Purdie
      6 *
      7 * Based on Sharp's 2.4 kernel patches
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/string.h>
     13#include <asm/mach/sharpsl_param.h>
     14#include <asm/memory.h>
     15
     16/*
     17 * Certain hardware parameters determined at the time of device manufacture,
     18 * typically including LCD parameters are loaded by the bootloader at the
     19 * address PARAM_BASE. As the kernel will overwrite them, we need to store
     20 * them early in the boot process, then pass them to the appropriate drivers.
     21 * Not all devices use all parameters but the format is common to all.
     22 */
     23#ifdef CONFIG_ARCH_SA1100
     24#define PARAM_BASE	0xe8ffc000
     25#define param_start(x)	(void *)(x)
     26#else
     27#define PARAM_BASE	0xa0000a00
     28#define param_start(x)	__va(x)
     29#endif
     30#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 )  | ( b << 8 ) | a )
     31
     32#define COMADJ_MAGIC	MAGIC_CHG('C','M','A','D')
     33#define UUID_MAGIC	MAGIC_CHG('U','U','I','D')
     34#define TOUCH_MAGIC	MAGIC_CHG('T','U','C','H')
     35#define AD_MAGIC	MAGIC_CHG('B','V','A','D')
     36#define PHAD_MAGIC	MAGIC_CHG('P','H','A','D')
     37
     38struct sharpsl_param_info sharpsl_param;
     39EXPORT_SYMBOL(sharpsl_param);
     40
     41void sharpsl_save_param(void)
     42{
     43	struct sharpsl_param_info *params = param_start(PARAM_BASE);
     44
     45	memcpy(&sharpsl_param, params, sizeof(*params));
     46
     47	if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
     48		sharpsl_param.comadj=-1;
     49
     50	if (sharpsl_param.phad_keyword != PHAD_MAGIC)
     51		sharpsl_param.phadadj=-1;
     52
     53	if (sharpsl_param.uuid_keyword != UUID_MAGIC)
     54		sharpsl_param.uuid[0]=-1;
     55
     56	if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
     57		sharpsl_param.touch_xp=-1;
     58
     59	if (sharpsl_param.adadj_keyword != AD_MAGIC)
     60		sharpsl_param.adadj=-1;
     61}
     62
     63