150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Copyright (c) 1994 Digital Equipment Corporation
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Module Name:
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adjust.c
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Abstract:
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This module contains platform-independent slot resource adjust routines.
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Author:
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Eric Rehm 6-January-1994
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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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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,HalpAdjustResourceListUpperLimits)
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#endif
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VOID
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HalpAdjustResourceListUpperLimits (
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IN OUT PIO_RESOURCE_REQUIREMENTS_LIST *pResourceList,
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IN LARGE_INTEGER MaximumPortAddress,
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IN LARGE_INTEGER MaximumMemoryAddress,
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IN ULONG MaximumInterruptVector,
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IN ULONG MaximumDmaChannel
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)
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/*++
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Routine Description:
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Adjust a pResource list with respect to the upper bounds supplied.
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(A resource is changed only if it execceds the maximum.)
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Arguments:
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pResouceList - Resource list to be checked.
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MaximumPortAddress - Maximum I/O port allowed.
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MaximumMemoryAddress - Maximum I/O memory address allowed.
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MaximumInterruptVector - Maximum interrupt vector allowed.
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MaximumDmaChannel - Maximum dma channel allowed.
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Return Value:
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None.
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--*/
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{
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PIO_RESOURCE_REQUIREMENTS_LIST CompleteList;
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PIO_RESOURCE_LIST ResourceList;
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PIO_RESOURCE_DESCRIPTOR Descriptor;
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ULONG alt, cnt;
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//
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// Walk each ResourceList and shrink any values to system limits
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//
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CompleteList = *pResourceList;
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ResourceList = CompleteList->List;
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for (alt=0; alt < CompleteList->AlternativeLists; alt++) {
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Descriptor = ResourceList->Descriptors;
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for (cnt = ResourceList->Count; cnt; cnt--) {
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//
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// Make sure descriptor limits fall within the
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// CompleteList->InterfaceType & CompleteList->BusNumber.
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//
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//
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switch (Descriptor->Type) {
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case CmResourceTypePort:
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if (Descriptor->u.Port.MaximumAddress.QuadPart >
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MaximumPortAddress.QuadPart) {
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Descriptor->u.Port.MaximumAddress = MaximumPortAddress;
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}
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break;
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case CmResourceTypeInterrupt:
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if (Descriptor->u.Interrupt.MaximumVector >
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MaximumInterruptVector ) {
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Descriptor->u.Interrupt.MaximumVector =
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MaximumInterruptVector;
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}
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break;
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case CmResourceTypeMemory:
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if (Descriptor->u.Memory.MaximumAddress.QuadPart >
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MaximumMemoryAddress.QuadPart) {
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Descriptor->u.Memory.MaximumAddress =
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MaximumMemoryAddress;
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}
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break;
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case CmResourceTypeDma:
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if (Descriptor->u.Dma.MaximumChannel >
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MaximumDmaChannel ) {
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Descriptor->u.Dma.MaximumChannel =
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MaximumDmaChannel;
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}
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break;
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#if DBG
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default:
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DbgPrint ("HalAdjustResourceList: Unkown resource type\n");
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break;
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#endif
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}
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//
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// Next descriptor
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//
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Descriptor++;
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}
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//
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// Next Resource List
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//
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ResourceList = (PIO_RESOURCE_LIST) Descriptor;
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}
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}
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