public BusMasterDma(IdeConfig !ideConfig)
{
ideConfigHandle = ideConfig;
// Set up BusMaster ports for this controller
// <command, status, PRD table>
commandPort = ideConfig.DmaBase.PortAtOffset(0, 1, Access.ReadWrite);
statusPort = ideConfig.DmaBase.PortAtOffset(2, 1, Access.ReadWrite);
prdPort = ideConfig.DmaBase.PortAtOffset(4, 4, Access.ReadWrite);
// PRD needs to be 4-byte aligned and within one 4k page.
prdRegion =
IoMemory.AllocatePhysical(PRD_MAX_ENTRIES * PRD_BYTES_PER_ENTRY,
PRD_ALIGNMENT);
} // BusMasterInitialize
IdentifyDeviceInformation GetDeviceIdentification(IdeController !controller,
int devsel, bool atapi)
{
ushort[] identifyData = new ushort[256];
if (!controller.PollBSY(false))
{
// should fail here.
}
controller.SelectDevice(devsel, atapi);
//DebugStub.Print(" IDE GetDeviceIdentification starting\n");
bool iflag = PrivilegedGate.DisableInterrupts();
try {
controller.SetIdentifyInProgress(true);
controller.PollDRDY(true);
byte cmd = (atapi)? (byte)IdeCommand.IdentifyPacketDevice:
(byte)IdeCommand.IdentifyDevice;
controller.WriteCommandPort(cmd); //will post interrupt
controller.Delay400ns();
Tracing.Log(Tracing.Debug, "status={0}", (UIntPtr)controller.ReadFullStatus());
controller.PollDRDY(true); // Device indicates ready.
}
finally {
PrivilegedGate.RestoreInterrupts(iflag);
}
IdeConfig config = controller.GetConfig();
bool success = (config != null) && config.IdentifyEndEvent.WaitOne(TimeSpan.FromMilliseconds(250));
if (!success)
{
//DebugStub.Break();
Tracing.Log(Tracing.Debug, " IDE GetDeviceIdentification did NOT receive interrupt\n");
controller.SetIdentifyInProgress(false);
}
//DebugStub.Print(" IDE GetDeviceIdentification received interrupt\n");
// XXX: We should check for an Error condition here.
// XXX: We should check for the ATAPI signature here.
byte statusBits = controller.ReadAlternateStatusPort();
if ((statusBits & (byte)ATA6.IdeStatus.ERR) > 0)
{
Tracing.Log(Tracing.Debug, "ERR reported in status after IdentifyDevice!\n");
DebugStub.Break();
}
for (int i = 0; i < 256; i++)
{
identifyData[i] = controller.ReadDataPort();
}
IdentifyDeviceInformation ident = ParseIdentifyInformation(identifyData);
//// if (atapi)
if (ident.ModelNumber == "Virtual CD") // SECTOR_SIZE is actually 2048
{
ident.MaxLBASectors = 650 * 1024 * 1024 / IdeRequest.SECTOR_SIZE;
}
// for IdeDisk::ReadWrite tests
return(ident);
}
