138 lines
2.3 KiB
C
138 lines
2.3 KiB
C
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#include <ndis.h>
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#include "dmautil.h"
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BOOLEAN
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IsIrqlGreaterThanDispatch(
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VOID
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);
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VOID
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InitializeDmaUtil(
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PDMA_UTIL DmaUtil,
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NDIS_HANDLE DmaHandle
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)
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{
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RtlZeroMemory(
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DmaUtil,
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sizeof(*DmaUtil)
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);
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DmaUtil->NdisDmaHandle=DmaHandle;
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return;
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}
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NTSTATUS
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StartDmaTransfer(
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PDMA_UTIL DmaUtil,
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PNDIS_BUFFER Buffer,
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ULONG Offset,
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ULONG Length,
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BOOLEAN ToDevice
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)
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{
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NDIS_STATUS Status;
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if (IsIrqlGreaterThanDispatch()) {
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DbgPrint("IR-DMAUTIL: Transfer started at raised IRQL\n");
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ASSERT(0);
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return STATUS_UNSUCCESSFUL;
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}
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if (DmaUtil->Buffer != NULL) {
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DbgPrint("IR-DMAUTIL: Transfer started when one is already in progress\n");
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ASSERT(0);
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return STATUS_UNSUCCESSFUL;
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}
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DmaUtil->Buffer=Buffer;
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DmaUtil->Offset=Offset;
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DmaUtil->Length=Length;
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DmaUtil->Direction=ToDevice;
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NdisMSetupDmaTransfer(
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&Status,
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DmaUtil->NdisDmaHandle,
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Buffer,
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Offset,
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Length,
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ToDevice
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);
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if (Status != STATUS_SUCCESS) {
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DbgPrint("IR-DMAUTIL: NdisMSetupDmaTransfer() failed %08lx\n",Status);
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DmaUtil->Buffer=NULL;
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}
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return Status;
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}
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NTSTATUS
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CompleteDmaTransfer(
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PDMA_UTIL DmaUtil,
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BOOLEAN ToDevice
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)
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{
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NDIS_STATUS Status;
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if (IsIrqlGreaterThanDispatch()) {
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DbgPrint("IR-DMAUTIL: CompleteTransfer called at raised IRQL\n");
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ASSERT(0);
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return STATUS_UNSUCCESSFUL;
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}
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if (DmaUtil->Buffer == NULL) {
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DbgPrint("IR-DMAUTIL: CompleteTransfer called when no transfer it active\n");
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ASSERT(0);
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return STATUS_UNSUCCESSFUL;
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}
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if (ToDevice != DmaUtil->Direction) {
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DbgPrint("IR-DMAUTIL: CompleteTransfer called for the wrong direction of transfer\n");
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ASSERT(0);
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return STATUS_UNSUCCESSFUL;
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}
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NdisMCompleteDmaTransfer(
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&Status,
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DmaUtil->NdisDmaHandle,
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DmaUtil->Buffer,
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DmaUtil->Offset,
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DmaUtil->Length,
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DmaUtil->Direction
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);
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if (Status != STATUS_SUCCESS) {
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DbgPrint("IR-DMAUTIL: NdisMCompleteDmaTransfer() failed %08lx\n",Status);
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}
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DmaUtil->Buffer=NULL;
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return Status;
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}
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