Atmosphere/libraries/libexosphere/source/flow/flow_api.cpp

/*
 * Copyright (c) 2018-2020 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 <exosphere.hpp>

namespace ams::flow {

    namespace {

        struct FlowControllerRegisterOffset {
            u16 cpu_csr;
            u16 halt_cpu_events;
            u16 cc4_core_ctrl;
        };

        constinit uintptr_t g_register_address = secmon::MemoryRegionPhysicalDeviceFlowController.GetAddress();

        constexpr const FlowControllerRegisterOffset FlowControllerRegisterOffsets[] = {
            { FLOW_CTLR_CPU0_CSR, FLOW_CTLR_HALT_CPU0_EVENTS, FLOW_CTLR_CC4_CORE0_CTRL, },
            { FLOW_CTLR_CPU1_CSR, FLOW_CTLR_HALT_CPU1_EVENTS, FLOW_CTLR_CC4_CORE1_CTRL, },
            { FLOW_CTLR_CPU2_CSR, FLOW_CTLR_HALT_CPU2_EVENTS, FLOW_CTLR_CC4_CORE2_CTRL, },
            { FLOW_CTLR_CPU3_CSR, FLOW_CTLR_HALT_CPU3_EVENTS, FLOW_CTLR_CC4_CORE3_CTRL, },
        };

    }

    void SetRegisterAddress(uintptr_t address) {
        g_register_address = address;
    }

    void ResetCpuRegisters(int core) {
        AMS_ASSUME(core >= 0);

        const auto &offsets = FlowControllerRegisterOffsets[core];
        reg::Write(g_register_address + offsets.cpu_csr,         0);
        reg::Write(g_register_address + offsets.halt_cpu_events, 0);
    }

}