778 lines
20 KiB
C
778 lines
20 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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intobj.c
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Abstract:
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This module implements the kernel interrupt object. Functions are provided
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to initialize, connect, and disconnect interrupt objects.
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Author:
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David N. Cutler (davec) 30-Jul-1989
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Environment:
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Kernel mode only.
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Revision History:
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23-Jan-1990 shielint
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Modified for NT386 interrupt manager
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--*/
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#include "ki.h"
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//
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// Externs from trap.asm used to compute and set handlers for unexpected
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// hardware interrupts.
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//
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extern ULONG KiStartUnexpectedRange(VOID);
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extern ULONG KiEndUnexpectedRange(VOID);
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extern ULONG KiUnexpectedEntrySize;
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VOID
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KiInterruptDispatch2ndLvl(
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VOID
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);
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VOID
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KiChainedDispatch2ndLvl(
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VOID
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);
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typedef enum {
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NoConnect,
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NormalConnect,
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ChainConnect,
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UnkownConnect
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} CONNECT_TYPE, *PCONNECT_TYPE;
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typedef struct {
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CONNECT_TYPE Type;
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PKINTERRUPT Interrupt;
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PKINTERRUPT_ROUTINE NoDispatch;
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PKINTERRUPT_ROUTINE InterruptDispatch;
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PKINTERRUPT_ROUTINE FloatingDispatch;
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PKINTERRUPT_ROUTINE ChainedDispatch;
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PKINTERRUPT_ROUTINE *FlatDispatch;
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} DISPATCH_INFO, *PDISPATCH_INFO;
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VOID
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KiGetVectorInfo (
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IN ULONG Vector,
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OUT PDISPATCH_INFO DispatchInfo
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);
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VOID
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KiConnectVectorAndInterruptObject (
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IN PKINTERRUPT Interrupt,
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IN CONNECT_TYPE Type
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);
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VOID
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KeInitializeInterrupt (
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IN PKINTERRUPT Interrupt,
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IN PKSERVICE_ROUTINE ServiceRoutine,
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IN PVOID ServiceContext,
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IN PKSPIN_LOCK SpinLock OPTIONAL,
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IN ULONG Vector,
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IN KIRQL Irql,
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IN KIRQL SynchronizeIrql,
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IN KINTERRUPT_MODE InterruptMode,
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IN BOOLEAN ShareVector,
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IN CCHAR ProcessorNumber,
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IN BOOLEAN FloatingSave
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)
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/*++
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Routine Description:
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This function initializes a kernel interrupt object. The service routine,
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service context, spin lock, vector, IRQL, SynchronizeIrql, and floating
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context save flag are initialized.
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Arguments:
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Interrupt - Supplies a pointer to a control object of type interrupt.
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ServiceRoutine - Supplies a pointer to a function that is to be
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executed when an interrupt occurs via the specified interrupt
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vector.
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ServiceContext - Supplies a pointer to an arbitrary data structure which is
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to be passed to the function specified by the ServiceRoutine parameter.
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SpinLock - Supplies a pointer to an executive spin lock.
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Vector - Supplies the index of the entry in the Interrupt Dispatch Table
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that is to be associated with the ServiceRoutine function.
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Irql - Supplies the request priority of the interrupting source.
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SynchronizeIrql - The request priority that the interrupt should be
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synchronized with.
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InterruptMode - Supplies the mode of the interrupt; LevelSensitive or
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ShareVector - Supplies a boolean value that specifies whether the
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vector can be shared with other interrupt objects or not. If FALSE
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then the vector may not be shared, if TRUE it may be.
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Latched.
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ProcessorNumber - Supplies the number of the processor to which the
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interrupt will be connected.
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FloatingSave - Supplies a boolean value that determines whether the
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floating point registers and pipe line are to be saved before calling
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the ServiceRoutine function.
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Return Value:
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None.
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--*/
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{
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LONG Index;
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PULONG pl;
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PULONG NormalDispatchCode;
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//
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// Initialize standard control object header.
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//
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Interrupt->Type = InterruptObject;
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Interrupt->Size = sizeof(KINTERRUPT);
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//
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// Initialize the address of the service routine,
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// the service context, the address of the spin lock, the vector
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// number, the IRQL of the interrupting source, the Irql used for
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// synchronize execution, the interrupt mode, the processor
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// number, and the floating context save flag.
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//
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Interrupt->ServiceRoutine = ServiceRoutine;
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Interrupt->ServiceContext = ServiceContext;
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if (ARGUMENT_PRESENT(SpinLock)) {
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Interrupt->ActualLock = SpinLock;
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} else {
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KeInitializeSpinLock (&Interrupt->SpinLock);
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Interrupt->ActualLock = &Interrupt->SpinLock;
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}
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Interrupt->Vector = Vector;
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Interrupt->Irql = Irql;
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Interrupt->SynchronizeIrql = SynchronizeIrql;
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Interrupt->Mode = InterruptMode;
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Interrupt->ShareVector = ShareVector;
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Interrupt->Number = ProcessorNumber;
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Interrupt->FloatingSave = FloatingSave;
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//
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// Initialize fields for the interrupt storm detection. Set these
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// to -1 so that the first time through the interrupt dispatch they
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// will be reset correctly.
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//
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Interrupt->TickCount = (ULONG)-1;
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Interrupt->DispatchCount = (ULONG)-1;
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//
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// Copy the interrupt dispatch code template into the interrupt object
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// and edit the machine code stored in the structure (please see
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// _KiInterruptTemplate in intsup.asm.) Finally, flush the dcache
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// on all processors that the current thread can
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// run on to ensure that the code is actually in memory.
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//
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NormalDispatchCode = &(Interrupt->DispatchCode[0]);
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pl = NormalDispatchCode;
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for (Index = 0; Index < NORMAL_DISPATCH_LENGTH; Index += 1) {
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*NormalDispatchCode++ = KiInterruptTemplate[Index];
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}
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//
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// The following two instructions set the address of current interrupt
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// object the the NORMAL dispatching code.
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//
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pl = (PULONG)((PUCHAR)pl + ((PUCHAR)&KiInterruptTemplateObject -
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(PUCHAR)KiInterruptTemplate) -4);
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*pl = (ULONG)Interrupt;
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KeSweepDcache(FALSE);
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//
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// Set the connected state of the interrupt object to FALSE.
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//
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Interrupt->Connected = FALSE;
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return;
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}
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BOOLEAN
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KeConnectInterrupt (
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IN PKINTERRUPT Interrupt
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)
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/*++
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Routine Description:
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This function connects an interrupt object to the interrupt vector
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specified by the interrupt object. If the interrupt object is already
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connected, or an attempt is made to connect to an interrupt that cannot
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be connected, then a value of FALSE is returned. Else the specified
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interrupt object is connected to the interrupt vector, the connected
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state is set to TRUE, and TRUE is returned as the function value.
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Arguments:
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Interrupt - Supplies a pointer to a control object of type interrupt.
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Return Value:
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If the interrupt object is already connected or an attempt is made to
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connect to an interrupt vector that cannot be connected, then a value
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of FALSE is returned. Else a value of TRUE is returned.
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--*/
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{
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DISPATCH_INFO DispatchInfo;
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BOOLEAN Connected;
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BOOLEAN ConnectError;
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BOOLEAN Enabled;
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KIRQL Irql;
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CCHAR Number;
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KIRQL OldIrql;
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ULONG Vector;
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//
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// If the interrupt object is already connected, the interrupt vector
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// number is invalid, an attempt is being made to connect to a vector
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// that cannot be connected, the interrupt request level is invalid, or
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// the processor number is invalid, then do not connect the interrupt
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// object. Else connect interrupt object to the specified vector and
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// establish the proper interrupt dispatcher.
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//
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Connected = FALSE;
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ConnectError = FALSE;
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Irql = Interrupt->Irql;
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Number = Interrupt->Number;
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Vector = Interrupt->Vector;
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if ( !((Irql > HIGH_LEVEL) ||
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(Number >= KeNumberProcessors) ||
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(Interrupt->SynchronizeIrql < Irql) ||
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(Interrupt->FloatingSave) // R0 x87 usage not supported on x86
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)
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) {
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//
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//
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// Set system affinity to the specified processor.
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//
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KeSetSystemAffinityThread((KAFFINITY)(1<<Number));
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//
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// Raise IRQL to dispatcher level and lock dispatcher database.
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//
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KiLockDispatcherDatabase(&OldIrql);
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//
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// Is interrupt object already connected?
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//
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if (!Interrupt->Connected) {
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//
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// Determine interrupt dispatch vector
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//
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KiGetVectorInfo (
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Vector,
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&DispatchInfo
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);
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//
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// If dispatch vector is not connected, then connect it
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//
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if (DispatchInfo.Type == NoConnect) {
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Connected = TRUE;
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Interrupt->Connected = TRUE;
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//
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// Connect interrupt dispatch to interrupt object dispatch code
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//
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InitializeListHead(&Interrupt->InterruptListEntry);
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KiConnectVectorAndInterruptObject (Interrupt, NormalConnect);
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//
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// Enabled system vector
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//
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Enabled = HalEnableSystemInterrupt(Vector, Irql, Interrupt->Mode);
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if (!Enabled) {
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ConnectError = TRUE;
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}
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} else if (DispatchInfo.Type != UnkownConnect &&
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Interrupt->ShareVector &&
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DispatchInfo.Interrupt->ShareVector &&
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DispatchInfo.Interrupt->Mode == Interrupt->Mode) {
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//
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// Vector is already connected as sharable. New vector is sharable
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// and modes match. Chain new vector.
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//
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Connected = TRUE;
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Interrupt->Connected = TRUE;
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ASSERT (Irql <= SYNCH_LEVEL);
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//
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// If not already using chained dispatch handler, set it up
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//
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if (DispatchInfo.Type != ChainConnect) {
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KiConnectVectorAndInterruptObject (DispatchInfo.Interrupt, ChainConnect);
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}
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//
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// Add to tail of chained dispatch
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//
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InsertTailList(
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&DispatchInfo.Interrupt->InterruptListEntry,
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&Interrupt->InterruptListEntry
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);
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}
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}
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//
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// Unlock dispatcher database and lower IRQL to its previous value.
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//
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KiUnlockDispatcherDatabase(OldIrql);
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//
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// Set system affinity back to the original value.
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//
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KeRevertToUserAffinityThread();
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}
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if (Connected && ConnectError) {
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#if DBG
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DbgPrint ("HalEnableSystemInterrupt failed\n");
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#endif
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KeDisconnectInterrupt (Interrupt);
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Connected = FALSE;
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}
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//
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// Return whether interrupt was connected to the specified vector.
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//
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return Connected;
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}
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BOOLEAN
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KeDisconnectInterrupt (
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IN PKINTERRUPT Interrupt
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)
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/*++
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Routine Description:
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This function disconnects an interrupt object from the interrupt vector
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specified by the interrupt object. If the interrupt object is not
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connected, then a value of FALSE is returned. Else the specified interrupt
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object is disconnected from the interrupt vector, the connected state is
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set to FALSE, and TRUE is returned as the function value.
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Arguments:
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Interrupt - Supplies a pointer to a control object of type interrupt.
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Return Value:
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If the interrupt object is not connected, then a value of FALSE is
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returned. Else a value of TRUE is returned.
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--*/
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{
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DISPATCH_INFO DispatchInfo;
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BOOLEAN Connected;
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PKINTERRUPT Interrupty;
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KIRQL Irql;
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KIRQL OldIrql;
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ULONG Vector;
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//
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// Set system affinity to the specified processor.
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//
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KeSetSystemAffinityThread((KAFFINITY)(1<<Interrupt->Number));
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//
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// Raise IRQL to dispatcher level and lock dispatcher database.
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//
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KiLockDispatcherDatabase(&OldIrql);
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//
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// If the interrupt object is connected, then disconnect it from the
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// specified vector.
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//
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Connected = Interrupt->Connected;
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if (Connected) {
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Irql = Interrupt->Irql;
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Vector = Interrupt->Vector;
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//
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// If the specified interrupt vector is not connected to the chained
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// interrupt dispatcher, then disconnect it by setting its dispatch
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// address to the unexpected interrupt routine. Else remove the
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// interrupt object from the interrupt chain. If there is only
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// one entry remaining in the list, then reestablish the dispatch
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// address.
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//
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//
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// Determine interrupt dispatch vector
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//
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KiGetVectorInfo (
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Vector,
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&DispatchInfo
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);
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//
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// Is dispatch a chained handler?
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//
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if (DispatchInfo.Type == ChainConnect) {
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ASSERT (Irql <= SYNCH_LEVEL);
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//
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// Is interrupt being removed from head?
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//
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if (Interrupt == DispatchInfo.Interrupt) {
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//
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// Update next interrupt object to be head
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//
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DispatchInfo.Interrupt = CONTAINING_RECORD(
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DispatchInfo.Interrupt->InterruptListEntry.Flink,
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KINTERRUPT,
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InterruptListEntry
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);
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KiConnectVectorAndInterruptObject (DispatchInfo.Interrupt, ChainConnect);
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}
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//
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// Remove interrupt object
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//
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RemoveEntryList(&Interrupt->InterruptListEntry);
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//
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// If there's only one interrupt object left on this vector,
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// determine proper interrupt dispatcher
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//
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Interrupty = CONTAINING_RECORD(
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DispatchInfo.Interrupt->InterruptListEntry.Flink,
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KINTERRUPT,
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InterruptListEntry
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);
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if (DispatchInfo.Interrupt == Interrupty) {
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KiConnectVectorAndInterruptObject (Interrupty, NormalConnect);
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}
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} else {
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//
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// Removing last interrupt object from the vector. Disable the
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// vector, and set it to unconnected
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//
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HalDisableSystemInterrupt(Interrupt->Vector, Irql);
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KiConnectVectorAndInterruptObject (Interrupt, NoConnect);
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}
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KeSweepIcache(TRUE);
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Interrupt->Connected = FALSE;
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}
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//
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// Unlock dispatcher database and lower IRQL to its previous value.
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//
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KiUnlockDispatcherDatabase(OldIrql);
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//
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// Set system affinity back to the original value.
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//
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KeRevertToUserAffinityThread();
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//
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// Return whether interrupt was disconnected from the specified vector.
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//
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return Connected;
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}
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VOID
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KiGetVectorInfo (
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IN ULONG Vector,
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OUT PDISPATCH_INFO DispatchInfo
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)
|
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{
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PKINTERRUPT_ROUTINE Dispatch;
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ULONG CurrentDispatch;
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ULONG DispatchType;
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UCHAR IDTEntry;
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//
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// Get second level dispatch point
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//
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DispatchType = HalSystemVectorDispatchEntry (
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Vector,
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&DispatchInfo->FlatDispatch,
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&DispatchInfo->NoDispatch
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);
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//
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// Get vector info
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//
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switch (DispatchType) {
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case 0:
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//
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// Primary dispatch
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//
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IDTEntry = HalVectorToIDTEntry(Vector);
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DispatchInfo->NoDispatch = (PKINTERRUPT_ROUTINE) (((ULONG) &KiStartUnexpectedRange) +
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(IDTEntry - PRIMARY_VECTOR_BASE) * KiUnexpectedEntrySize);
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DispatchInfo->InterruptDispatch = KiInterruptDispatch;
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DispatchInfo->FloatingDispatch = KiFloatingDispatch;
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DispatchInfo->ChainedDispatch = KiChainedDispatch;
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DispatchInfo->FlatDispatch = NULL;
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CurrentDispatch = (ULONG) KiReturnHandlerAddressFromIDT(Vector);
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DispatchInfo->Interrupt = CONTAINING_RECORD (
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CurrentDispatch,
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KINTERRUPT,
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DispatchCode
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);
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break;
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case 1:
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//
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// Secondardy dispatch.
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//
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DispatchInfo->InterruptDispatch = KiInterruptDispatch2ndLvl;
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DispatchInfo->FloatingDispatch = KiInterruptDispatch2ndLvl;
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DispatchInfo->ChainedDispatch = KiChainedDispatch2ndLvl;
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CurrentDispatch = (ULONG) *DispatchInfo->FlatDispatch;
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DispatchInfo->Interrupt = (PKINTERRUPT) ( (PUCHAR) CurrentDispatch -
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(PUCHAR) KiInterruptTemplate +
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(PUCHAR) &KiInterruptTemplate2ndDispatch
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);
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break;
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default:
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// Other values reserved
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KeBugCheck (MISMATCHED_HAL);
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}
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//
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// Determine dispatch type
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//
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if (((PKINTERRUPT_ROUTINE) CurrentDispatch) == DispatchInfo->NoDispatch) {
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//
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// Is connected to the NoDispatch function
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//
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DispatchInfo->Type = NoConnect;
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} else {
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Dispatch = DispatchInfo->Interrupt->DispatchAddress;
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if (Dispatch == DispatchInfo->ChainedDispatch) {
|
||
//
|
||
// Is connected to the chained handler
|
||
//
|
||
|
||
DispatchInfo->Type = ChainConnect;
|
||
|
||
} else if (Dispatch == DispatchInfo->InterruptDispatch ||
|
||
Dispatch == DispatchInfo->FloatingDispatch) {
|
||
//
|
||
// If connection to the non-chained handler
|
||
//
|
||
|
||
DispatchInfo->Type = NormalConnect;
|
||
|
||
} else {
|
||
|
||
//
|
||
// Unkown connection
|
||
//
|
||
|
||
DispatchInfo->Type = UnkownConnect;
|
||
#if DBG
|
||
DbgPrint ("KiGetVectorInfo not understood\n");
|
||
#endif
|
||
}
|
||
}
|
||
}
|
||
|
||
VOID
|
||
KiConnectVectorAndInterruptObject (
|
||
IN PKINTERRUPT Interrupt,
|
||
IN CONNECT_TYPE Type
|
||
)
|
||
{
|
||
PKINTERRUPT_ROUTINE DispatchAddress;
|
||
DISPATCH_INFO DispatchInfo;
|
||
PULONG pl;
|
||
|
||
//
|
||
// Get current connect info
|
||
//
|
||
|
||
KiGetVectorInfo (
|
||
Interrupt->Vector,
|
||
&DispatchInfo
|
||
);
|
||
|
||
//
|
||
// If disconnecting, set vector to NoDispatch
|
||
//
|
||
|
||
if (Type == NoConnect) {
|
||
|
||
DispatchAddress = DispatchInfo.NoDispatch;
|
||
|
||
} else {
|
||
|
||
//
|
||
// Set interrupt objects dispatch for new type
|
||
//
|
||
|
||
DispatchAddress = DispatchInfo.ChainedDispatch;
|
||
|
||
if (Type == NormalConnect) {
|
||
DispatchAddress = DispatchInfo.InterruptDispatch;
|
||
if (Interrupt->FloatingSave) {
|
||
DispatchAddress = DispatchInfo.FloatingDispatch;
|
||
}
|
||
}
|
||
|
||
Interrupt->DispatchAddress = DispatchAddress;
|
||
|
||
//
|
||
// Set interrupt objects dispatch code to kernel dispatcher
|
||
//
|
||
|
||
pl = &(Interrupt->DispatchCode[0]);
|
||
pl = (PULONG)((PUCHAR)pl +
|
||
((PUCHAR)&KiInterruptTemplateDispatch -
|
||
(PUCHAR)KiInterruptTemplate) -4);
|
||
|
||
*pl = (ULONG)DispatchAddress-(ULONG)((PUCHAR)pl+4);
|
||
|
||
//
|
||
// Set dispatch vector to proper address dispatch code location
|
||
//
|
||
|
||
if (DispatchInfo.FlatDispatch) {
|
||
|
||
//
|
||
// Connect to flat dispatch
|
||
//
|
||
|
||
DispatchAddress = (PKINTERRUPT_ROUTINE)
|
||
((PUCHAR) &(Interrupt->DispatchCode[0]) +
|
||
((PUCHAR) &KiInterruptTemplate2ndDispatch -
|
||
(PUCHAR) KiInterruptTemplate));
|
||
|
||
} else {
|
||
|
||
//
|
||
// Connect to enter_all dispatch
|
||
//
|
||
|
||
DispatchAddress = (PKINTERRUPT_ROUTINE) &Interrupt->DispatchCode;
|
||
}
|
||
}
|
||
|
||
|
||
if (DispatchInfo.FlatDispatch) {
|
||
|
||
//
|
||
// Connect to flat dispatch
|
||
//
|
||
|
||
*DispatchInfo.FlatDispatch = DispatchAddress;
|
||
|
||
} else {
|
||
|
||
//
|
||
// Connect to IDT
|
||
//
|
||
|
||
KiSetHandlerAddressToIDT (Interrupt->Vector, DispatchAddress);
|
||
}
|
||
}
|