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service/am: Implement EnterFatalSection and LeaveFatalSection
These functions act in tandem similar to how a lock or mutex require a balanced lock()/unlock() sequence. EnterFatalSection simply increments a counter for how many times it has been called, while LeaveFatalSection ensures that a previous call to EnterFatalSection has occured. If a previous call has occurred (the counter is not zero), then the counter gets decremented as one would expect. If a previous call has not occurred (the counter is zero), then an error code is returned.
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@ -239,8 +239,8 @@ ISelfController::ISelfController(std::shared_ptr<NVFlinger::NVFlinger> nvflinger
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{0, nullptr, "Exit"},
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{1, &ISelfController::LockExit, "LockExit"},
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{2, &ISelfController::UnlockExit, "UnlockExit"},
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{3, nullptr, "EnterFatalSection"},
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{4, nullptr, "LeaveFatalSection"},
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{3, &ISelfController::EnterFatalSection, "EnterFatalSection"},
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{4, &ISelfController::LeaveFatalSection, "LeaveFatalSection"},
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{9, &ISelfController::GetLibraryAppletLaunchableEvent, "GetLibraryAppletLaunchableEvent"},
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{10, &ISelfController::SetScreenShotPermission, "SetScreenShotPermission"},
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{11, &ISelfController::SetOperationModeChangedNotification, "SetOperationModeChangedNotification"},
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@ -299,6 +299,30 @@ void ISelfController::UnlockExit(Kernel::HLERequestContext& ctx) {
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rb.Push(RESULT_SUCCESS);
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}
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void ISelfController::EnterFatalSection(Kernel::HLERequestContext& ctx) {
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++num_fatal_sections_entered;
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LOG_DEBUG(Service_AM, "called. Num fatal sections entered: {}", num_fatal_sections_entered);
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IPC::ResponseBuilder rb{ctx, 2};
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rb.Push(RESULT_SUCCESS);
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}
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void ISelfController::LeaveFatalSection(Kernel::HLERequestContext& ctx) {
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LOG_DEBUG(Service_AM, "called.");
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// Entry and exit of fatal sections must be balanced.
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if (num_fatal_sections_entered == 0) {
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IPC::ResponseBuilder rb{ctx, 2};
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rb.Push(ResultCode{ErrorModule::AM, 512});
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return;
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}
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--num_fatal_sections_entered;
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IPC::ResponseBuilder rb{ctx, 2};
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rb.Push(RESULT_SUCCESS);
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}
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void ISelfController::GetLibraryAppletLaunchableEvent(Kernel::HLERequestContext& ctx) {
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LOG_WARNING(Service_AM, "(STUBBED) called");
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@ -119,6 +119,8 @@ public:
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private:
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void LockExit(Kernel::HLERequestContext& ctx);
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void UnlockExit(Kernel::HLERequestContext& ctx);
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void EnterFatalSection(Kernel::HLERequestContext& ctx);
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void LeaveFatalSection(Kernel::HLERequestContext& ctx);
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void GetLibraryAppletLaunchableEvent(Kernel::HLERequestContext& ctx);
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void SetScreenShotPermission(Kernel::HLERequestContext& ctx);
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void SetOperationModeChangedNotification(Kernel::HLERequestContext& ctx);
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@ -135,6 +137,7 @@ private:
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std::shared_ptr<NVFlinger::NVFlinger> nvflinger;
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Kernel::EventPair launchable_event;
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u32 idle_time_detection_extension = 0;
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u64 num_fatal_sections_entered = 0;
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};
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class ICommonStateGetter final : public ServiceFramework<ICommonStateGetter> {
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