/// <summary>
/// Registers the AC97 driver
/// </summary>
public static void Init()
{
Pci.PciDriver driver = new Pci.PciDriver();
driver.Name = "AC97 Driver";
driver.Exit = exitHander;
driver.Init = initHandler;
Pci.RegisterDriver(0x8086, 0x2415, driver);
// TODO
AudioFS.SoundDevice device = new AudioFS.SoundDevice();
device.Name = "AC97 audio device";
device.Writer = Writer;
device.Reader = Reader;
AudioFS.SetDevice(device);
}
/// <summary>
/// IRQ Handler
/// </summary>
/// <returns>If we handled the irq</returns>
private static bool handler()
{
ushort sr = PortIO.In16((ushort)(m_nabmbar + REG_SR));
if ((sr & SR_LVBCI) > 0)
{
PortIO.Out16((ushort)(m_nabmbar + REG_SR), SR_LVBCI);
}
else if ((sr & SR_BCIS) > 0)
{
// Load next one already
int next = m_lvi + 2;
if (next >= BDL_COUNT)
{
next -= BDL_COUNT;
}
AudioFS.RequestBuffer(AudioFS.BufferSize, m_bufs[next]);
// Set current one
m_lvi++;
if (m_lvi == BDL_COUNT)
{
m_lvi = 0;
}
PortIO.Out8((ushort)(m_nabmbar + REG_LVI), (byte)m_lvi);
PortIO.Out16((ushort)(m_nabmbar + REG_SR), SR_BCIS);
}
else if ((sr & SR_FIFOE) > 0)
{
PortIO.Out16((ushort)(m_nabmbar + REG_SR), SR_FIFOE);
}
else
{
return(false);
}
return(true);
}
/// <summary>
/// Initializes sound and its drivers
/// </summary>
private static void initSound()
{
AudioFS.Init();
AC97.Init();
}