/*
    * GsiRouting.cpp
    * Platform interrupt lines for ACPI global system interrupts
    * Copyright (c) 2026 Daniel Hammer
*/

#include "GsiRouting.hpp"
#include <Arch/Interrupts.hpp>
#include <CppLib/Spinlock.hpp>

namespace Hal::GsiRouting {

    static constexpr uint8_t FirstLine = 1;
    static constexpr uint8_t LineCount = 24;

    static uint32_t g_lineGsi[LineCount] = {};
    static uint8_t g_nextLine = FirstLine;
    static kcp::Mutex g_lock;

    uint8_t LineForGsi(uint32_t gsi, bool levelTriggered, bool activeLow) {
        if (Arch::PlatformLinesAreFixed()) return 0;

        g_lock.Acquire();
        for (uint8_t line = FirstLine; line < g_nextLine; line++) {
            if (g_lineGsi[line] == gsi) {
                g_lock.Release();
                return line;
            }
        }

        uint8_t line = 0;
        if (g_nextLine < LineCount &&
            Arch::AssignPlatformLine(g_nextLine, gsi, levelTriggered, activeLow)) {
            line = g_nextLine++;
            g_lineGsi[line] = gsi;
        }
        g_lock.Release();
        return line;
    }

}