237 lines
7.3 KiB
C
237 lines
7.3 KiB
C
/*
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* Copyright (c) 2019-2020 shchmue
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*-----------------------------------------------------------------------*/
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/* Low level disk I/O module skeleton for FatFs (C)ChaN, 2016 */
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/*-----------------------------------------------------------------------*/
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/* If a working storage control module is available, it should be */
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/* attached to the FatFs via a glue function rather than modifying it. */
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/* This is an example of glue functions to attach various exsisting */
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/* storage control modules to the FatFs module with a defined API. */
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/*-----------------------------------------------------------------------*/
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#include <string.h>
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#include "../../../common/memory_map.h"
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#include "diskio.h" /* FatFs lower layer API */
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#include "../../mem/heap.h"
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#include "../../sec/se.h"
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#include "../../storage/nx_emmc.h"
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#include "../../storage/sdmmc.h"
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extern sdmmc_storage_t sd_storage;
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extern sdmmc_storage_t storage;
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extern emmc_part_t *system_part;
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typedef struct {
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u32 sector;
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u32 visit_count;
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u8 tweak[0x10];
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u8 cached_sector[0x200];
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u8 align[8];
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} sector_cache_t;
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#define MAX_SEC_CACHE_ENTRIES 64
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static sector_cache_t *sector_cache = NULL;
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static u32 secindex = 0;
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bool clear_sector_cache = false;
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DSTATUS disk_status (
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BYTE pdrv /* Physical drive number to identify the drive */
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)
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{
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return 0;
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}
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DSTATUS disk_initialize (
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BYTE pdrv /* Physical drive number to identify the drive */
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)
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{
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return 0;
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}
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static inline void _gf256_mul_x_le(void *block) {
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u8 *pdata = (u8 *)block;
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u32 carry = 0;
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for (u32 i = 0; i < 0x10; i++) {
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u8 b = pdata[i];
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pdata[i] = (b << 1) | carry;
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carry = b >> 7;
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}
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if (carry)
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pdata[0x0] ^= 0x87;
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}
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static inline int _emmc_xts(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool regen_tweak, u32 tweak_exp, u64 sec, void *dst, void *src, u32 secsize) {
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int res = 0;
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u8 *pdst = (u8 *)dst;
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u8 *psrc = (u8 *)src;
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if (regen_tweak) {
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for (int i = 0xF; i >= 0; i--) {
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tweak[i] = sec & 0xFF;
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sec >>= 8;
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}
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if (!se_aes_crypt_block_ecb(ks1, 1, tweak, tweak))
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goto out;
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}
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for (u32 i = 0; i < tweak_exp * 0x20; i++)
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_gf256_mul_x_le(tweak);
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u8 temptweak[0x10];
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memcpy(temptweak, tweak, 0x10);
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//We are assuming a 0x10-aligned sector size in this implementation.
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for (u32 i = 0; i < secsize / 0x10; i++) {
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for (u32 j = 0; j < 0x10; j++)
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pdst[j] = psrc[j] ^ tweak[j];
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_gf256_mul_x_le(tweak);
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psrc += 0x10;
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pdst += 0x10;
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}
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se_aes_crypt_ecb(ks2, enc, dst, secsize, src, secsize);
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pdst = (u8 *)dst;
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memcpy(tweak, temptweak, 0x10);
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for (u32 i = 0; i < secsize / 0x10; i++) {
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for (u32 j = 0; j < 0x10; j++)
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pdst[j] = pdst[j] ^ tweak[j];
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_gf256_mul_x_le(tweak);
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pdst += 0x10;
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}
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res = 1;
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out:;
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return res;
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}
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DRESULT disk_read (
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BYTE pdrv, /* Physical drive number to identify the drive */
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BYTE *buff, /* Data buffer to store read data */
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DWORD sector, /* Start sector in LBA */
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UINT count /* Number of sectors to read */
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)
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{
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switch (pdrv)
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{
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case 0:
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if (((u32)buff >= DRAM_START) && !((u32)buff % 8))
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return sdmmc_storage_read(&sd_storage, sector, count, buff) ? RES_OK : RES_ERROR;
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u8 *buf = (u8 *)SDMMC_UPPER_BUFFER;
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if (sdmmc_storage_read(&sd_storage, sector, count, buf))
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{
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memcpy(buff, buf, 512 * count);
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return RES_OK;
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}
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return RES_ERROR;
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case 1:;
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__attribute__ ((aligned (16))) static u8 tweak[0x10];
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__attribute__ ((aligned (16))) static u64 prev_cluster = -1;
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__attribute__ ((aligned (16))) static u32 prev_sector = 0;
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bool needs_cache_sector = false;
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if (secindex == 0 || clear_sector_cache) {
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if (!sector_cache)
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sector_cache = (sector_cache_t *)malloc(sizeof(sector_cache_t) * MAX_SEC_CACHE_ENTRIES);
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clear_sector_cache = false;
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secindex = 0;
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}
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u32 s = 0;
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if (count == 1) {
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for ( ; s < secindex; s++) {
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if (sector_cache[s].sector == sector) {
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sector_cache[s].visit_count++;
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memcpy(buff, sector_cache[s].cached_sector, 0x200);
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memcpy(tweak, sector_cache[s].tweak, 0x10);
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prev_sector = sector;
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prev_cluster = sector / 0x20;
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return RES_OK;
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}
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}
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// add to cache
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if (s == secindex && s < MAX_SEC_CACHE_ENTRIES) {
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sector_cache[s].sector = sector;
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sector_cache[s].visit_count++;
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needs_cache_sector = true;
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secindex++;
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}
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}
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if (nx_emmc_part_read(&storage, system_part, sector, count, buff)) {
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u32 tweak_exp = 0;
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bool regen_tweak = true;
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if (prev_cluster != sector / 0x20) { // sector in different cluster than last read
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prev_cluster = sector / 0x20;
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tweak_exp = sector % 0x20;
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} else if (sector > prev_sector) { // sector in same cluster and past last sector
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tweak_exp = sector - prev_sector - 1;
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regen_tweak = false;
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} else { // sector in same cluster and before or same as last sector
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tweak_exp = sector % 0x20;
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}
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// fatfs will never pull more than a cluster
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_emmc_xts(9, 8, 0, tweak, regen_tweak, tweak_exp, prev_cluster, buff, buff, count * 0x200);
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if (needs_cache_sector) {
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memcpy(sector_cache[s].cached_sector, buff, 0x200);
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memcpy(sector_cache[s].tweak, tweak, 0x10);
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}
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prev_sector = sector + count - 1;
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return RES_OK;
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}
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return RES_ERROR;
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}
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return RES_ERROR;
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}
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DRESULT disk_write (
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BYTE pdrv, /* Physical drive number to identify the drive */
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const BYTE *buff, /* Data to be written */
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DWORD sector, /* Start sector in LBA */
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UINT count /* Number of sectors to write */
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)
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{
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if (pdrv == 1)
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return RES_WRPRT;
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if (((u32)buff >= DRAM_START) && !((u32)buff % 8))
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return sdmmc_storage_write(&sd_storage, sector, count, (void *)buff) ? RES_OK : RES_ERROR;
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u8 *buf = (u8 *)SDMMC_UPPER_BUFFER; //TODO: define this somewhere.
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memcpy(buf, buff, 512 * count);
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if (sdmmc_storage_write(&sd_storage, sector, count, buf))
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return RES_OK;
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return RES_ERROR;
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}
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DRESULT disk_ioctl (
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BYTE pdrv, /* Physical drive number (0..) */
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BYTE cmd, /* Control code */
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void *buff /* Buffer to send/receive control data */
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)
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{
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return RES_OK;
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}
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