Source code of Windows XP (NT5)
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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
ixpciint.c
Abstract:
All PCI bus interrupt mapping is in this module, so that a real
system which doesn't have all the limitations which PC PCI
systems have can replaced this code easly.
(bus memory & i/o address mappings can also be fix here)
Author:
Ken Reneris
Environment:
Kernel mode
Revision History:
--*/
#include "halp.h"
#include "pci.h"
#include "pcip.h"
ULONG PciIsaIrq;
ULONG HalpEisaELCR;
BOOLEAN HalpDoingCrashDump;
BOOLEAN HalpPciLockSettings;
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE,HalpGetPCIIntOnISABus)
#pragma alloc_text(PAGE,HalpAdjustPCIResourceList)
#pragma alloc_text(PAGE,HalpGetISAFixedPCIIrq)
#endif
VOID
HalpPCIPin2ISALine (
IN PBUS_HANDLER BusHandler,
IN PBUS_HANDLER RootHandler,
IN PCI_SLOT_NUMBER SlotNumber,
IN PPCI_COMMON_CONFIG PciData
)
/*++
This function maps the device's InterruptPin to an InterruptLine
value.
On the current PC implementations, the bios has already filled in
InterruptLine as it's ISA value and there's no portable way to
change it.
On a DBG build we adjust InterruptLine just to ensure driver's
don't connect to it without translating it on the PCI bus.
--*/
{
if (!PciData->u.type0.InterruptPin) {
return ;
}
//
// Set vector as a level vector. (note: this code assumes the
// irq is static and does not move).
//
if (PciData->u.type0.InterruptLine >= 1 &&
PciData->u.type0.InterruptLine <= 15) {
//
// If this bit was on the in the PIC ELCR register,
// then mark it in PciIsaIrq. (for use in hal.dll,
// such that we can assume the interrupt controller
// has been properly marked as a level interrupt for
// this IRQ. Other hals probabily don't care.)
//
PciIsaIrq |= HalpEisaELCR & (1 << PciData->u.type0.InterruptLine);
}
}
VOID
HalpPCIISALine2Pin (
IN PBUS_HANDLER BusHandler,
IN PBUS_HANDLER RootHandler,
IN PCI_SLOT_NUMBER SlotNumber,
IN PPCI_COMMON_CONFIG PciNewData,
IN PPCI_COMMON_CONFIG PciOldData
)
/*++
This functions maps the device's InterruptLine to it's
device specific InterruptPin value.
On the current PC implementations, this information is
fixed by the BIOS. Just make sure the value isn't being
editted since PCI doesn't tell us how to dynically
connect the interrupt.
--*/
{
if (!PciNewData->u.type0.InterruptPin) {
return ;
}
}
#if !defined(SUBCLASSPCI)
VOID
HalpPCIAcquireType2Lock (
PKSPIN_LOCK SpinLock,
PKIRQL Irql
)
{
if (!HalpDoingCrashDump) {
*Irql = KfRaiseIrql (HIGH_LEVEL);
KiAcquireSpinLock (SpinLock);
} else {
*Irql = HIGH_LEVEL;
}
}
VOID
HalpPCIReleaseType2Lock (
PKSPIN_LOCK SpinLock,
KIRQL Irql
)
{
if (!HalpDoingCrashDump) {
KiReleaseSpinLock (SpinLock);
KfLowerIrql (Irql);
}
}
#endif