Atmosphere/stratosphere/libstratosphere/source/cfg/cfg_sd_card.cpp
Michael Scire 4059dc6187 Results: Implement namespaced, type-safe results.
Because I was working on multiple things at once, this commit also:
- Adds wrappers for/linker flags to wrap CXX exceptions to make them
  abort. This saves ~0x8000 of memory in every system module.
- Broadly replaces lines of the pattern if (cond) { return ResultX; }
  with R_UNLESS(!cond, ResultX());.
- Reworks the R_TRY_CATCH macros (and the result macros in general).
2019-12-07 12:41:28 -08:00

101 lines
3.1 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>
#include <stratosphere/cfg.hpp>
#include <stratosphere/sm.hpp>
namespace sts::cfg {
namespace {
/* Convenience definitions. */
constexpr sm::ServiceName RequiredServicesForSdCardAccess[] = {
sm::ServiceName::Encode("pcv"),
sm::ServiceName::Encode("gpio"),
sm::ServiceName::Encode("pinmux"),
sm::ServiceName::Encode("psc:m"),
};
constexpr size_t NumRequiredServicesForSdCardAccess = util::size(RequiredServicesForSdCardAccess);
/* SD card globals. */
os::Mutex g_sd_card_lock;
bool g_sd_card_initialized = false;
FsFileSystem g_sd_card_filesystem = {};
/* SD card helpers. */
Result CheckSdCardServicesReady() {
for (size_t i = 0; i < NumRequiredServicesForSdCardAccess; i++) {
bool service_present = false;
R_TRY(sm::HasService(&service_present, RequiredServicesForSdCardAccess[i]));
if (!service_present) {
return fs::ResultSdCardNotPresent();
}
}
return ResultSuccess();
}
void WaitSdCardServicesReadyImpl() {
for (size_t i = 0; i < NumRequiredServicesForSdCardAccess; i++) {
R_ASSERT(sm::WaitService(RequiredServicesForSdCardAccess[i]));
}
}
Result TryInitializeSdCard() {
R_TRY(CheckSdCardServicesReady());
R_ASSERT(fsOpenSdCardFileSystem(&g_sd_card_filesystem));
g_sd_card_initialized = true;
return ResultSuccess();
}
void InitializeSdCard() {
WaitSdCardServicesReadyImpl();
R_ASSERT(fsOpenSdCardFileSystem(&g_sd_card_filesystem));
g_sd_card_initialized = true;
}
}
/* SD card utilities. */
bool IsSdCardRequiredServicesReady() {
return R_SUCCEEDED(CheckSdCardServicesReady());
}
void WaitSdCardRequiredServicesReady() {
WaitSdCardServicesReadyImpl();
}
bool IsSdCardInitialized() {
std::scoped_lock lk(g_sd_card_lock);
if (!g_sd_card_initialized) {
if (R_SUCCEEDED(TryInitializeSdCard())) {
g_sd_card_initialized = true;
}
}
return g_sd_card_initialized;
}
void WaitSdCardInitialized() {
std::scoped_lock lk(g_sd_card_lock);
InitializeSdCard();
}
}