nn_hai_preplaunch.cpp

void nn::hai::launch::PrepareLaunch(unsigned int* out, void* buffer, unsigned int val) {
	nn::hai::error::Error errorInstance; //stack
	nn::hai::error::Init(&errorInstance);
	if (errorInstance) goto quit; //will skip StopIfRequired call
	
	if (!buffer) {
		//much nn::hai::error::Error handling ensues; "Invalid buffer"
		goto quit;
	}
	
	int slotno = 0; //register
	unsigned int nn_act_status; //also on stack
	nn_act_status = nn::act::Initialize();
	
	if (nn_act_status & /*who knows? clrrwi. RA, RS, 31... 31?*/) {
		slotno = nn::act::GetSlotNo();
	}
	
	nn::act::Finalize();
	
	if (!(nn_act_status & /*same again*/)) {
		//Error handling; "failed to initialize nn::act"
		goto quit;
	}
	
	unsigned int nn_pdm_status; //register
	nn_pdm_status = nn::pdm::Initialize();
	if (!(nn_pdm_status & /*again*/)) {
		//Error handling; "failed to initialize nn::pdm"
		goto quit;
	}
	
	nn::pdm::NotifyEnterHaiModeEvent();
	nn::pdm::Finalize();
	
	unsigned int screenState = CMPTCheckScreenState(); //register
	if (!screenState) {
		//Error handling
		if (screenState == -9) {
			//"HDMI seems not beeing linked to TV\n" [sic]
			//Unlike the other error handlers, this does *not* set a fatal error
			goto quit;
		} else {
			//"failed to check screen state"
			goto quit;
		}
	}
	
	if (!CMPTAcctSetEulaBySlotNo(slotno)) {
		//Error handling: "failed to set EULA for current account"
		goto quit;
	}
	
	//This variable is a damn mystery.
	unsigned int enableDisableFlag = 0;
	int sysConfigStatus = getSysConfig(&enableDisableFlag); //something to do with the system config, "_SCIReadSysConfig" and "slc:ums.keep_alive" are the important bits
	if (sysConfigStatus != 1) {
		//Error handling: "failed to get enable/disable flag of US"
		goto quit;
	}
	
	unsigned int apd_param = 0; //stack, this C++ compiler is high or something
	if (IM_GetNVParameterWithoutHandleAndItb(3, &apd_param)) {
		//Error handling: "failed to get APD params"
		goto quit;
	}
	
	unsigned int apd_param2 = 0;
	if (!param) {
		if (IM_GetNVParameterWithoutHandleAndItb(4, &apd_param2)) {
			//Error handling; as above
			goto quit;
		}
	}
	
	//There's a mystery write here invoving apd_param2 and enableDisableFlag's evil +1 cousin
	
	if (CMPTExSetWorkBuffer(buffer, val)) {
		//Error handling: "failed to set work buffer for prepare l" [sic]
		goto quit;
	}
	
	if (CMPTExPrepareLaunch(3, &enableDisableFlag, 5)) {
		//Error handling: "failed to prepare compat mode launch"
		//not fatal if return code was -0xA
		goto quit;
	}
	
quit:
	nn::hai::error::StopIfRequired(&errorInstance);
	
	unsigned int* mystery_stack_ptr; //completely random place on stack, see for yourself
	for (int i = 5; i != 0; i--) { //praise bdnz
		*out = *mystery_stack_ptr;
		out += 4; //add 4 bytes, not 4 ints
		mystery_stack_ptr += 4;
	}
}