/*
 * 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 <mesosphere.hpp>

namespace ams::kern::svc {

    /* =============================    Common    ============================= */

    namespace {

        constexpr bool IsValidProcessMemoryPermission(ams::svc::MemoryPermission perm) {
            switch (perm) {
                case ams::svc::MemoryPermission_None:
                case ams::svc::MemoryPermission_Read:
                case ams::svc::MemoryPermission_ReadWrite:
                case ams::svc::MemoryPermission_ReadExecute:
                    return true;
                default:
                    return false;
            }
        }

        Result SetProcessMemoryPermission(ams::svc::Handle process_handle, uint64_t address, uint64_t size, ams::svc::MemoryPermission perm) {
            /* Validate the address/size. */
            R_UNLESS(util::IsAligned(address, PageSize),         svc::ResultInvalidAddress());
            R_UNLESS(util::IsAligned(size,    PageSize),         svc::ResultInvalidSize());
            R_UNLESS(size > 0,                                   svc::ResultInvalidSize());
            R_UNLESS((address < address + size),                 svc::ResultInvalidCurrentMemory());
            R_UNLESS(address == static_cast<uintptr_t>(address), svc::ResultInvalidCurrentMemory());
            R_UNLESS(size == static_cast<size_t>(size),          svc::ResultInvalidCurrentMemory());

            /* Validate the memory permission. */
            R_UNLESS(IsValidProcessMemoryPermission(perm), svc::ResultInvalidNewMemoryPermission());

            /* Get the process from its handle. */
            KScopedAutoObject process = GetCurrentProcess().GetHandleTable().GetObject<KProcess>(process_handle);
            R_UNLESS(process.IsNotNull(), svc::ResultInvalidHandle());

            /* Validate that the address is in range. */
            auto &page_table = process->GetPageTable();
            R_UNLESS(page_table.Contains(address, size), svc::ResultInvalidCurrentMemory());

            /* Set the memory permission. */
            return page_table.SetProcessMemoryPermission(address, size, perm);
        }

    }

    /* =============================    64 ABI    ============================= */

    Result SetProcessMemoryPermission64(ams::svc::Handle process_handle, uint64_t address, uint64_t size, ams::svc::MemoryPermission perm) {
        return SetProcessMemoryPermission(process_handle, address, size, perm);
    }

    Result MapProcessMemory64(ams::svc::Address dst_address, ams::svc::Handle process_handle, uint64_t src_address, ams::svc::Size size) {
        MESOSPHERE_PANIC("Stubbed SvcMapProcessMemory64 was called.");
    }

    Result UnmapProcessMemory64(ams::svc::Address dst_address, ams::svc::Handle process_handle, uint64_t src_address, ams::svc::Size size) {
        MESOSPHERE_PANIC("Stubbed SvcUnmapProcessMemory64 was called.");
    }

    Result MapProcessCodeMemory64(ams::svc::Handle process_handle, uint64_t dst_address, uint64_t src_address, uint64_t size) {
        MESOSPHERE_PANIC("Stubbed SvcMapProcessCodeMemory64 was called.");
    }

    Result UnmapProcessCodeMemory64(ams::svc::Handle process_handle, uint64_t dst_address, uint64_t src_address, uint64_t size) {
        MESOSPHERE_PANIC("Stubbed SvcUnmapProcessCodeMemory64 was called.");
    }

    /* ============================= 64From32 ABI ============================= */

    Result SetProcessMemoryPermission64From32(ams::svc::Handle process_handle, uint64_t address, uint64_t size, ams::svc::MemoryPermission perm) {
        return SetProcessMemoryPermission(process_handle, address, size, perm);
    }

    Result MapProcessMemory64From32(ams::svc::Address dst_address, ams::svc::Handle process_handle, uint64_t src_address, ams::svc::Size size) {
        MESOSPHERE_PANIC("Stubbed SvcMapProcessMemory64From32 was called.");
    }

    Result UnmapProcessMemory64From32(ams::svc::Address dst_address, ams::svc::Handle process_handle, uint64_t src_address, ams::svc::Size size) {
        MESOSPHERE_PANIC("Stubbed SvcUnmapProcessMemory64From32 was called.");
    }

    Result MapProcessCodeMemory64From32(ams::svc::Handle process_handle, uint64_t dst_address, uint64_t src_address, uint64_t size) {
        MESOSPHERE_PANIC("Stubbed SvcMapProcessCodeMemory64From32 was called.");
    }

    Result UnmapProcessCodeMemory64From32(ams::svc::Handle process_handle, uint64_t dst_address, uint64_t src_address, uint64_t size) {
        MESOSPHERE_PANIC("Stubbed SvcUnmapProcessCodeMemory64From32 was called.");
    }

}