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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sm_common.h (1362B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright © 2009 - Maxim Levitsky
      4 * Common routines & support for SmartMedia/xD format
      5 */
      6#include <linux/bitops.h>
      7#include <linux/mtd/mtd.h>
      8
      9/* Full oob structure as written on the flash */
     10struct sm_oob {
     11	uint32_t reserved;
     12	uint8_t data_status;
     13	uint8_t block_status;
     14	uint8_t lba_copy1[2];
     15	uint8_t ecc2[3];
     16	uint8_t lba_copy2[2];
     17	uint8_t ecc1[3];
     18} __packed;
     19
     20
     21/* one sector is always 512 bytes, but it can consist of two nand pages */
     22#define SM_SECTOR_SIZE		512
     23
     24/* oob area is also 16 bytes, but might be from two pages */
     25#define SM_OOB_SIZE		16
     26
     27/* This is maximum zone size, and all devices that have more that one zone
     28   have this size */
     29#define SM_MAX_ZONE_SIZE 	1024
     30
     31/* support for small page nand */
     32#define SM_SMALL_PAGE 		256
     33#define SM_SMALL_OOB_SIZE	8
     34
     35
     36int sm_register_device(struct mtd_info *mtd, int smartmedia);
     37
     38
     39static inline int sm_sector_valid(struct sm_oob *oob)
     40{
     41	return hweight16(oob->data_status) >= 5;
     42}
     43
     44static inline int sm_block_valid(struct sm_oob *oob)
     45{
     46	return hweight16(oob->block_status) >= 7;
     47}
     48
     49static inline int sm_block_erased(struct sm_oob *oob)
     50{
     51	static const uint32_t erased_pattern[4] = {
     52		0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
     53
     54	/* First test for erased block */
     55	if (!memcmp(oob, erased_pattern, sizeof(*oob)))
     56		return 1;
     57	return 0;
     58}