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158 lines
2.9 KiB
158 lines
2.9 KiB
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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isr.c
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Abstract:
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This module contains code for the interrupt service routine
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for the SoundBlaster device driver.
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Author:
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Robin Speed (RobinSp) 12-Nov-1992
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include "sound.h"
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//
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// Driver ISR
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//
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// When we get here, we acknowledge the interrupt from the
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// DSP and simply let the defered processing routine take over
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// to complete the task.
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//
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#if DBG
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ULONG sndBogusInterrupts = 0;
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#endif // DBG
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BOOLEAN
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SoundISR(
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IN PKINTERRUPT pInterrupt,
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IN PVOID Context
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)
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/*++
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Routine Description:
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Interrupt service routine for the soundblaster card.
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Arguments:
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pInterrupt - our interrupt
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Contest - Pointer to our global device info
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Return Value:
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TRUE if we handled the interrupt
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--*/
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{
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PGLOBAL_DEVICE_INFO pGDI;
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BOOLEAN Result;
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pGDI = (PGLOBAL_DEVICE_INFO)Context;
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ASSERT(pGDI->Key == GDI_KEY);
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dprintf5(("<"));
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//
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// Acknowledge the interrupt
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//
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HwInterruptAcknowledge(&pGDI->Hw);
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//
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// See who the interrupt is for and request the
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// appropriate deferred routine
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//
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Result = TRUE;
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//
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// Dismiss OPL3 interrupt if any - otherwise we'll be interrupted
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// forever!
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//
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if (pGDI->Synth.Hw.SynthBase != NULL) {
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if (READ_PORT_UCHAR(pGDI->Synth.Hw.SynthBase) & 0x80) {
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SynthMidiSendFM(pGDI->Synth.Hw.SynthBase, 4, 0x60);
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pGDI->Synth.InterruptFired = TRUE;
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return Result;
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}
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}
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//
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// It is valid to test DMABusy because it is set ON before we start
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// interrupts
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if (pGDI->WaveInfo.DMABusy) {
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dprintf5((pGDI->WaveInfo.Direction ? "o" : "i"));
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//
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// Check to see if we're overrunning, don't queue a Dpc if
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// we are.
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//
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if (!pGDI->WaveInfo.DpcQueued) {
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pGDI->WaveInfo.DpcQueued = TRUE;
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// ASSERTMSG("Overrun count not zeroed by Dpc routine",
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// pGDI->WaveInfo.Overrun == 0);
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IoRequestDpc(pGDI->WaveInfo.DeviceObject,
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NULL,
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NULL);
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} else {
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//
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// Overrun !
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//
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if (pGDI->WaveInfo.Overrun == 0) {
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dprintf2(("Wave overrun"));
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}
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pGDI->WaveInfo.Overrun++;
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}
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} else {
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#if DBG
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// We only get 10 valid interrupts when we test the interrupt
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// for validity in init.c. If we get lots more here there
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// may be a problem.
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sndBogusInterrupts++;
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if ((sndBogusInterrupts % 20) == 0) {
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dprintf2(("%u bogus interrupts so far", sndBogusInterrupts - 10));
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}
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#endif // DBG
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//
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// Set the return value to FALSE to say we didn't
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// handle the interrupt.
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//
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Result = FALSE;
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}
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dprintf5((">"));
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return Result;
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}
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