mirror of
https://github.com/Atmosphere-NX/Atmosphere
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70 lines
2.2 KiB
C++
70 lines
2.2 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 <exosphere.hpp>
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#include "../secmon_error.hpp"
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#include "secmon_smc_se_lock.hpp"
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namespace ams::secmon::smc {
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namespace {
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constinit std::atomic_bool g_is_locked = false;
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}
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bool TryLockSecurityEngine() {
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bool value = false;
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return g_is_locked.compare_exchange_strong(value, true);
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}
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void UnlockSecurityEngine() {
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g_is_locked = false;
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}
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bool IsSecurityEngineLocked() {
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return g_is_locked;
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}
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SmcResult LockSecurityEngineAndInvoke(SmcArguments &args, SmcHandler impl) {
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/* Try to lock the security engine. */
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SMC_R_UNLESS(TryLockSecurityEngine(), Busy);
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ON_SCOPE_EXIT { UnlockSecurityEngine(); };
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return impl(args);
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}
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SmcResult LockSecurityEngineAndInvokeAsync(SmcArguments &args, SmcHandler impl, GetResultHandler result_handler) {
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/* Try to lock the security engine. */
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SMC_R_UNLESS(TryLockSecurityEngine(), Busy);
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auto se_guard = SCOPE_GUARD { UnlockSecurityEngine(); };
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/* Try to start an async operation. */
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const u64 async_key = BeginAsyncOperation(result_handler);
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SMC_R_UNLESS(async_key != InvalidAsyncKey, Busy);
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auto async_guard = SCOPE_GUARD { CancelAsyncOperation(async_key); };
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/* Try to invoke the operation. */
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SMC_R_TRY(impl(args));
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/* We succeeded! Cancel our guards, and return the async key to our caller. */
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async_guard.Cancel();
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se_guard.Cancel();
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args.r[1] = async_key;
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return SmcResult::Success;
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}
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}
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