mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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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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#include <stratosphere.hpp>
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namespace ams::emummc {
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namespace {
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/* Convenience Definitions. */
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constexpr u32 StorageMagic = util::FourCC<'E','F','S','0'>::Code;
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constexpr size_t MaxDirLen = 0x7F;
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/* Types. */
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struct BaseConfig {
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u32 magic;
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u32 type;
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u32 id;
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u32 fs_version;
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};
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struct PartitionConfig {
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u64 start_sector;
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};
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struct FileConfig {
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char path[MaxDirLen + 1];
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};
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struct ExosphereConfig {
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BaseConfig base_cfg;
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union {
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PartitionConfig partition_cfg;
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FileConfig file_cfg;
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};
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char emu_dir_path[MaxDirLen + 1];
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};
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enum Storage : u32 {
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Storage_Emmc,
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Storage_Sd,
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Storage_SdFile,
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Storage_Count,
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};
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/* Globals. */
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os::Mutex g_lock;
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ExosphereConfig g_exo_config;
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bool g_is_emummc;
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bool g_has_cached;
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/* Helpers. */
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void CacheValues() {
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std::scoped_lock lk(g_lock);
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if (g_has_cached) {
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return;
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}
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/* Retrieve and cache values. */
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{
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typename std::aligned_storage<2 * (MaxDirLen + 1), os::MemoryPageSize>::type path_storage;
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struct {
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char file_path[MaxDirLen + 1];
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char nintendo_path[MaxDirLen + 1];
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} *paths = reinterpret_cast<decltype(paths)>(&path_storage);
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/* Retrieve paths from secure monitor. */
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AMS_ASSERT(spl::smc::AtmosphereGetEmummcConfig(&g_exo_config, paths, 0) == spl::smc::Result::Success);
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const Storage storage = static_cast<Storage>(g_exo_config.base_cfg.type);
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g_is_emummc = g_exo_config.base_cfg.magic == StorageMagic && storage != Storage_Emmc;
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/* Format paths. Ignore string format warnings. */
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wformat-truncation"
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{
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if (storage == Storage_SdFile) {
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std::snprintf(g_exo_config.file_cfg.path, sizeof(g_exo_config.file_cfg.path), "/%s", paths->file_path);
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}
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std::snprintf(g_exo_config.emu_dir_path, sizeof(g_exo_config.emu_dir_path), "/%s", paths->nintendo_path);
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/* If we're emummc, implement default nintendo redirection path. */
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if (g_is_emummc && std::strcmp(g_exo_config.emu_dir_path, "/") == 0) {
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std::snprintf(g_exo_config.emu_dir_path, sizeof(g_exo_config.emu_dir_path), "/emummc/Nintendo_%04x", g_exo_config.base_cfg.id);
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}
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}
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#pragma GCC diagnostic pop
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}
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g_has_cached = true;
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}
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}
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/* Get whether emummc is active. */
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bool IsActive() {
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CacheValues();
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return g_is_emummc;
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}
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/* Get Nintendo redirection path. */
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const char *GetNintendoDirPath() {
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CacheValues();
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if (!g_is_emummc) {
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return nullptr;
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}
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return g_exo_config.emu_dir_path;
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}
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/* Get Emummc folderpath, NULL if not file-based. */
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const char *GetFilePath() {
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CacheValues();
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if (!g_is_emummc || g_exo_config.base_cfg.type != Storage_SdFile) {
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return nullptr;
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}
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return g_exo_config.file_cfg.path;
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}
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}
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