Atmosphere/stratosphere/libstratosphere/source/emummc_utilities.cpp
Michael Scire f534d3498e git subrepo clone https://github.com/Atmosphere-NX/libstratosphere stratosphere/libstratosphere
subrepo:
  subdir:   "stratosphere/libstratosphere"
  merged:   "0c5dab80"
upstream:
  origin:   "https://github.com/Atmosphere-NX/libstratosphere"
  branch:   "master"
  commit:   "0c5dab80"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"
2019-07-17 20:04:00 -07:00

144 lines
3.9 KiB
C++

/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <switch.h>
#include <stratosphere.hpp>
/* EFS0 */
static constexpr u32 EmummcStorageMagic = 0x30534645;
static constexpr size_t EmummcMaxDirLength = 0x7F;
struct EmummcBaseConfig {
u32 magic;
u32 type;
u32 id;
u32 fs_version;
};
struct EmummcPartitionConfig {
u64 start_sector;
};
struct EmummcFileConfig {
char path[EmummcMaxDirLength+1];
};
struct ExoEmummcConfig {
EmummcBaseConfig base_cfg;
union {
EmummcPartitionConfig partition_cfg;
EmummcFileConfig file_cfg;
};
char emu_dir_path[EmummcMaxDirLength+1];
};
enum EmummcType {
EmummcType_Emmc = 0,
EmummcType_Sd,
EmummcType_SdFile,
EmummcType_Max,
};
static bool g_IsEmummc = false;
static bool g_HasCached = false;
static Mutex g_Mutex;
static ExoEmummcConfig g_exo_emummc_config;
static void _CacheValues(void)
{
if (__atomic_load_n(&g_HasCached, __ATOMIC_SEQ_CST))
return;
mutexLock(&g_Mutex);
if (g_HasCached) {
mutexUnlock(&g_Mutex);
return;
}
static struct {
char file_path[EmummcMaxDirLength+1];
char nintendo_path[EmummcMaxDirLength+1];
} __attribute__((aligned(0x1000))) paths;
{
SecmonArgs args = {0};
args.X[0] = 0xF0000404; /* smcAmsGetEmunandConfig */
args.X[1] = 0; /* NAND */
args.X[2] = reinterpret_cast<u64>(&paths); /* path output */
R_ASSERT(svcCallSecureMonitor(&args));
if (args.X[0] != 0) {
std::abort();
}
std::memcpy(&g_exo_emummc_config, &args.X[1], sizeof(args) - sizeof(args.X[0]));
}
const EmummcType emummc_type = static_cast<EmummcType>(g_exo_emummc_config.base_cfg.type);
/* Ignore format warnings. */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-truncation"
switch (emummc_type) {
case EmummcType_SdFile:
std::snprintf(g_exo_emummc_config.file_cfg.path, sizeof(g_exo_emummc_config.file_cfg.path), "/%s", paths.file_path);
break;
default:
break;
}
std::snprintf(g_exo_emummc_config.emu_dir_path, sizeof(g_exo_emummc_config.emu_dir_path), "/%s", paths.nintendo_path);
g_IsEmummc = g_exo_emummc_config.base_cfg.magic == EmummcStorageMagic && emummc_type != EmummcType_Emmc;
/* Default Nintendo redirection path. */
if (g_IsEmummc) {
if (std::strcmp(g_exo_emummc_config.emu_dir_path, "/") == 0) {
std::snprintf(g_exo_emummc_config.emu_dir_path, sizeof(g_exo_emummc_config.emu_dir_path), "/emummc/Nintendo_%04x", g_exo_emummc_config.base_cfg.id);
}
}
#pragma GCC diagnostic pop
__atomic_store_n(&g_HasCached, true, __ATOMIC_SEQ_CST);
mutexUnlock(&g_Mutex);
}
/* Get whether emummc is active. */
bool IsEmummc() {
_CacheValues();
return g_IsEmummc;
}
/* Get Nintendo redirection path. */
const char *GetEmummcNintendoDirPath() {
_CacheValues();
if (!g_IsEmummc) {
return nullptr;
}
return g_exo_emummc_config.emu_dir_path;
}
/* Get Emummc folderpath, NULL if not file-based. */
const char *GetEmummcFilePath() {
_CacheValues();
if (!g_IsEmummc || g_exo_emummc_config.base_cfg.type != EmummcType_SdFile) {
return nullptr;
}
return g_exo_emummc_config.file_cfg.path;
}