Atmosphere/libraries/libstratosphere/source/dd/dd_io_mappings.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 <stratosphere.hpp>

namespace ams::dd {

    uintptr_t QueryIoMapping(uintptr_t phys_addr, size_t size) {
        u64 virtual_addr;
        const u64 aligned_addr = util::AlignDown(phys_addr, os::MemoryPageSize);
        const size_t offset = phys_addr - aligned_addr;
        const u64 aligned_size = size + offset;
        R_TRY_CATCH(svcQueryIoMapping(&virtual_addr, aligned_addr, aligned_size)) {
            /* Official software handles this by returning 0. */
            R_CATCH(svc::ResultNotFound) { return 0; }
        } R_END_TRY_CATCH_WITH_ASSERT;

        return static_cast<uintptr_t>(virtual_addr + offset);
    }

    namespace {

        inline u32 ReadWriteRegisterImpl(uintptr_t phys_addr, u32 value, u32 mask) {
            u32 out_value;
            R_ASSERT(svcReadWriteRegister(&out_value, phys_addr, mask, value));
            return out_value;
        }

    }

    u32 ReadRegister(uintptr_t phys_addr) {
        return ReadWriteRegisterImpl(phys_addr, 0, 0);
    }

    void WriteRegister(uintptr_t phys_addr, u32 value) {
        ReadWriteRegisterImpl(phys_addr, value, ~u32());
    }

    u32 ReadWriteRegister(uintptr_t phys_addr, u32 value, u32 mask) {
        return ReadWriteRegisterImpl(phys_addr, value, mask);
    }

}