150 lines
3 KiB
C
150 lines
3 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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ixpciint.c
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Abstract:
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All PCI bus interrupt mapping is in this module, so that a real
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system which doesn't have all the limitations which PC PCI
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systems have can replaced this code easly.
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(bus memory & i/o address mappings can also be fix here)
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Author:
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Ken Reneris
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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 "halp.h"
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#include "pci.h"
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#include "pcip.h"
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ULONG PciIsaIrq;
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ULONG HalpEisaELCR;
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BOOLEAN HalpDoingCrashDump;
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BOOLEAN HalpPciLockSettings;
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,HalpGetPCIIntOnISABus)
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#pragma alloc_text(PAGE,HalpAdjustPCIResourceList)
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#pragma alloc_text(PAGE,HalpGetISAFixedPCIIrq)
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#endif
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VOID
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HalpPCIPin2ISALine (
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IN PBUS_HANDLER BusHandler,
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IN PBUS_HANDLER RootHandler,
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IN PCI_SLOT_NUMBER SlotNumber,
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IN PPCI_COMMON_CONFIG PciData
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)
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/*++
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This function maps the device's InterruptPin to an InterruptLine
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value.
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On the current PC implementations, the bios has already filled in
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InterruptLine as it's ISA value and there's no portable way to
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change it.
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On a DBG build we adjust InterruptLine just to ensure driver's
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don't connect to it without translating it on the PCI bus.
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--*/
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{
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if (!PciData->u.type0.InterruptPin) {
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return ;
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}
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//
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// Set vector as a level vector. (note: this code assumes the
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// irq is static and does not move).
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//
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if (PciData->u.type0.InterruptLine >= 1 &&
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PciData->u.type0.InterruptLine <= 15) {
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//
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// If this bit was on the in the PIC ELCR register,
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// then mark it in PciIsaIrq. (for use in hal.dll,
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// such that we can assume the interrupt controller
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// has been properly marked as a level interrupt for
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// this IRQ. Other hals probabily don't care.)
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//
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PciIsaIrq |= HalpEisaELCR & (1 << PciData->u.type0.InterruptLine);
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}
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}
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VOID
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HalpPCIISALine2Pin (
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IN PBUS_HANDLER BusHandler,
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IN PBUS_HANDLER RootHandler,
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IN PCI_SLOT_NUMBER SlotNumber,
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IN PPCI_COMMON_CONFIG PciNewData,
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IN PPCI_COMMON_CONFIG PciOldData
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)
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/*++
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This functions maps the device's InterruptLine to it's
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device specific InterruptPin value.
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On the current PC implementations, this information is
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fixed by the BIOS. Just make sure the value isn't being
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editted since PCI doesn't tell us how to dynically
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connect the interrupt.
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--*/
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{
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if (!PciNewData->u.type0.InterruptPin) {
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return ;
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}
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}
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#if !defined(SUBCLASSPCI)
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VOID
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HalpPCIAcquireType2Lock (
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PKSPIN_LOCK SpinLock,
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PKIRQL Irql
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)
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{
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if (!HalpDoingCrashDump) {
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*Irql = KfRaiseIrql (HIGH_LEVEL);
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KiAcquireSpinLock (SpinLock);
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} else {
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*Irql = HIGH_LEVEL;
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}
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}
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VOID
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HalpPCIReleaseType2Lock (
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PKSPIN_LOCK SpinLock,
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KIRQL Irql
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)
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{
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if (!HalpDoingCrashDump) {
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KiReleaseSpinLock (SpinLock);
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KfLowerIrql (Irql);
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}
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}
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#endif
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