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419 lines
8.1 KiB
419 lines
8.1 KiB
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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mcirql.c
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Abstract:
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This module implements the code necessary to raise and lower Irql on
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PIC-based AMD64 systems (e.g. SoftHammer).
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Author:
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Forrest Foltz (forrestf) 27-Oct-2000
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "halcmn.h"
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//
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// Declare the relationship between PIC irqs and corresponding IRQLs. This
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// table is used during init only, and is the basis for building
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// Halp8259MaskTable and Halp8259IrqTable.
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//
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#define M(x) (1 << (x))
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USHORT HalpPicMapping[16] = {
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0, // 0 - PASSIVE_LEVEL
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0, // 1 - APC_LEVEL
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0, // 2 - DISPATCH_LEVEL
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M(15), // 3 - hardware
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M(14), // 4 - hardware
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M(13), // 5 - hardware
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M(12), // 6 - hardware
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M(11), // 7 - hardware
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M(10), // 8 - hardware
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M(9), // 9 - hardware
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M(7) | M(6), // 10 - hardware
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M(5) | M(4), // 11 - hardware
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M(3) | M(1), // 12 - hardware
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M(0), // 13 - CLOCK_LEVEL, SYNCH_LEVEL
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0, // 14 - IPI_LEVEL
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M(8) }; // 15 - PROFILE_LEVEL, HIGH_LEVEL
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//
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// Halp8259MaskTable is used to translate an IRQL to a PIC mask. It is
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// initialized in HalpInitialize8259Tables().
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//
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USHORT Halp8259MaskTable[16];
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//
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// Halp8259InterruptTable is used to translate a PIC interrupt level
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// to its associated IRQL. It is initialized in HalpInitialize8259Tables().
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//
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KIRQL Halp8259IrqTable[16];
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//
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// Vector table to invoke a software interrupt routine. These can be found
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// in amd64s.asm.
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//
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VOID HalpGenerateUnexpectedInterrupt(VOID);
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VOID HalpGenerateAPCInterrupt(VOID);
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VOID HalpGenerateDPCInterrupt(VOID);
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PHALP_SOFTWARE_INTERRUPT HalpSoftwareInterruptTable[] = {
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HalpGenerateUnexpectedInterrupt, // Irql = PASSIVE_LEVEL
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HalpGenerateAPCInterrupt, // Irql = APC_LEVEL
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HalpGenerateDPCInterrupt }; // Irql = DPC_LEVEL
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//
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// Table to quickly translate a software irr into the highest pending
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// software interrupt level.
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//
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KIRQL SWInterruptLookupTable[] = {
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0, // SWIRR=0, so highest pending SW irql= 0
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0, // SWIRR=1, so highest pending SW irql= 0
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1, // SWIRR=2, so highest pending SW irql= 1
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1, // SWIRR=3, so highest pending SW irql= 1
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2, // SWIRR=4, so highest pending SW irql= 2
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2, // SWIRR=5, so highest pending SW irql= 2
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2, // SWIRR=6, so highest pending SW irql= 2
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2 }; // SWIRR=7, so highest pending SW irql= 2
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VOID
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HalpRaiseIrql (
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IN KIRQL NewIrql,
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IN KIRQL CurrentIrql
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)
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/*++
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Routine Description:
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This routine is used to raise IRQL to the specified value. Also, a
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mask will be used to mask of all of the lower level 8259 interrupts.
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Parameters:
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NewIrql - the new irql to be raised to
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CurrentIrql - the current irql level
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None.
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Return Value:
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Nothing.
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--*/
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{
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ULONG flags;
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USHORT mask;
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PKPCR pcr;
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//
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// If the new IRQL is a software IRQL, just set the new level in the
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// PCR. Otherwise, program the 8259 as well.
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//
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if (NewIrql <= DISPATCH_LEVEL) {
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KPCR_WRITE_FIELD(Irql,&NewIrql);
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} else {
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flags = HalpDisableInterrupts();
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//
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// Interrupts are disabled, it is safe to access KPCR directly.
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//
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// Update the 8259's interrupt mask and set the new
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// Irql in the KPCR.
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//
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pcr = KeGetPcr();
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pcr->Irql = NewIrql;
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mask = (USHORT)pcr->Idr;
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mask |= Halp8259MaskTable[NewIrql];
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SET_8259_MASK(mask);
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HalpRestoreInterrupts(flags);
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}
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}
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VOID
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HalpLowerIrql (
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IN KIRQL NewIrql,
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IN KIRQL CurrentIrql
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)
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/*++
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Routine Description:
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This routine is used to lower IRQL to the specified value. Also,
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this routine checks to see if any software interrupt should be
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generated.
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Parameters:
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NewIrql - the new irql to be raised to
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CurrentIrql - the current irql level
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Return Value:
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Nothing.
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--*/
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{
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ULONG flags;
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PKPCR pcr;
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USHORT mask;
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KIRQL highestPending;
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flags = HalpDisableInterrupts();
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//
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// Get the current IRQL out of the PCR. Accessing the pcr directly
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// here is permissible, as interrupts are disabled.
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//
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pcr = KeGetPcr();
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//
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// If the old IRQL was greater than software interrupt level, then
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// reprogram the PIC to the new level.
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//
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if (CurrentIrql > DISPATCH_LEVEL) {
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mask = Halp8259MaskTable[NewIrql];
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mask |= pcr->Idr;
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SET_8259_MASK(mask);
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}
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pcr->Irql = NewIrql;
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//
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// Check for pending software interrupts.
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//
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highestPending = SWInterruptLookupTable[pcr->Irr];
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if (highestPending > CurrentIrql) {
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HalpSoftwareInterruptTable[highestPending]();
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}
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HalpRestoreInterrupts(flags);
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}
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KIRQL
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HalSwapIrql (
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IN KIRQL NewIrql
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)
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/*++
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Routine Description:
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This routine is used to change IRQL to a new value. It is intended
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to be called from the CR8 dispatcher and is used only on AMD64 PIC-based
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systems (e.g. SoftHammer).
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Parameters:
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NewIrql - the new irql to be raised to
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Return Value:
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The previous IRQL value.
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--*/
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{
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KIRQL currentIrql;
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KPCR_READ_FIELD(Irql,¤tIrql);
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if (NewIrql > currentIrql) {
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HalpRaiseIrql(NewIrql,currentIrql);
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} else if (NewIrql < currentIrql) {
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HalpLowerIrql(NewIrql,currentIrql);
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} else {
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}
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return currentIrql;
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}
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VOID
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HalEndSystemInterrupt (
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IN KIRQL NewIrql,
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IN ULONG Vector
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)
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/*++
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Routine Description:
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This routine is used to lower IRQL to the specified value.
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The IRQL and PIRQL will be updated accordingly. Also, this
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routine checks to see if any software interrupt should be
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generated. The following condition will cause software
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interrupt to be simulated:
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any software interrupt which has higher priority than
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current IRQL's is pending.
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NOTE: This routine simulates software interrupt as long as
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any pending SW interrupt level is higher than the current
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IRQL, even when interrupts are disabled.
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Arguments:
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NewIrql - the new irql to be set.
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Vector - Vector number of the interrupt
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Return Value:
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None.
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--*/
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{
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HalSwapIrql (NewIrql);
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}
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KIRQL
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HalGetCurrentIrql (
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VOID
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)
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/*++
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Routine Description
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This routine returns the current IRQL. It is intended to be called from
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the CR8 dispatch routine.
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Arguments
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None
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Return Value:
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The current IRQL
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--*/
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{
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KIRQL currentIrql;
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KPCR_READ_FIELD(Irql,¤tIrql);
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return currentIrql;
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}
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KIRQL
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HalpDisableAllInterrupts (
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VOID
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)
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/*++
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Routine Description:
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This routine is called during a system crash. The hal needs all
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interrupts disabled.
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Arguments:
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None.
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Return Value:
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None. All interrupts are masked off at the PIC.
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--*/
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{
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KIRQL oldIrql;
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KeRaiseIrql(HIGH_LEVEL, &oldIrql);
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return oldIrql;
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}
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VOID
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HalpInitialize8259Tables (
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VOID
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)
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/*++
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Routine Description
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This routine initializes Halp8259MaskTable[] and Halp8259IrqTable[]
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based on the contents of HalpPicMapping[].
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Arguments
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None
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Return Value:
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Nothing
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--*/
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{
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KIRQL irql;
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USHORT cumulativeMask;
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USHORT mask;
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UCHAR irq;
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//
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// Build Halp8259MaskTable[] and Halp8259IrqTable[]
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//
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cumulativeMask = 0;
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for (irql = 0; irql <= HIGH_LEVEL; irql++) {
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mask = HalpPicMapping[irql];
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//
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// Set the cumulative 8259 mask in the appropriate IRQL slot
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// in Halp8259MaskTable[]
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//
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cumulativeMask |= mask;
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Halp8259MaskTable[irql] = cumulativeMask;
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//
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// For each irq associated with this IRQL, store the IRQL
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// in that irq's slot in Halp8259IrqTable[]
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//
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irq = 0;
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while (mask != 0) {
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if ((mask & 1) != 0) {
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Halp8259IrqTable[irq] = irql;
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}
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mask >>= 1;
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irq += 1;
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}
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}
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}
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