124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
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/*++
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Copyright (c) 1995-1996 International Business Machines Corporation
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Module Name:
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pxidesup.c
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Abstract:
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The module provides IDE interrupt dispatching support
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for Carolina and Delmar systems.
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Author:
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Jim Wooldridge (jimw@vnet.ibm.com)
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Revision History:
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Chris Karamatas (ckaramats@vnet.ibm.com)
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5.19.95 - Moved clearing of Utah to before DD ISR is run
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- Consolodated code path for setting IdeVector & IdeInterruptRequest
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--*/
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#include "halp.h"
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#include "pxidesup.h"
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typedef BOOLEAN (*PSECONDARY_DISPATCH)(
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PVOID InterruptRoutine,
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PVOID ServiceContext,
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PVOID TrapFrame
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);
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BOOLEAN
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HalpHandleIdeInterrupt(
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IN PKINTERRUPT Interrupt,
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IN PVOID ServiceContext,
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IN PVOID TrapFrame
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)
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/*++
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Routine Description:
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This routine is entered as the result of an interrupt being generated
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via the vector that is connected to an interrupt object that describes
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the SIO device interrupts. Its function is to call the second
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level interrupt dispatch routine and acknowledge the interrupt at the SIO
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controller.
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N.B. This routine in entered and left with external interrupts disabled.
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Arguments:
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Interrupt - Supplies a pointer to the interrupt object.
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ServiceContext - Supplies a pointer to the SIO interrupt acknowledge
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register.
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None.
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Return Value:
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Returns the value returned from the second level routine.
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--*/
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{
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PSECONDARY_DISPATCH SioHandler;
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PKINTERRUPT SioInterrupt;
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BOOLEAN returnValue;
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UCHAR IdeInterruptRequest;
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USHORT IdeVector;
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IdeInterruptRequest = READ_REGISTER_UCHAR(
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(PUCHAR)HalpIoControlBase +
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IDE_INTERRUPT_REQUEST_REGISTER);
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if (IdeInterruptRequest & IDE_PRIMARY_INTERRUPT_REQUEST){
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IdeVector = PRIMARY_IDE_VECTOR;
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IdeInterruptRequest = IDE_SECONDARY_INTERRUPT_REQUEST;
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} else if (IdeInterruptRequest & IDE_SECONDARY_INTERRUPT_REQUEST ) {
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IdeVector = SECONDARY_IDE_VECTOR;
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IdeInterruptRequest = IDE_PRIMARY_INTERRUPT_REQUEST;
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} else {
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return ( FALSE);
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}
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//
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// Clear the interrupt in the UTAH IDE interrupt request register.
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//
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WRITE_REGISTER_UCHAR((PUCHAR)HalpIoControlBase +
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IDE_INTERRUPT_REQUEST_REGISTER,
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IdeInterruptRequest);
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//
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// Dispatch to the IDE interrupt service routine.
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//
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SioHandler = (PSECONDARY_DISPATCH)
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PCR->InterruptRoutine[DEVICE_VECTORS + IdeVector];
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SioInterrupt = CONTAINING_RECORD(SioHandler,
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KINTERRUPT,
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DispatchCode[0]);
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returnValue = SioHandler(SioInterrupt,
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SioInterrupt->ServiceContext,
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TrapFrame
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);
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return(returnValue);
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}
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