119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/*****************************************************************************
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*
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* COPYRIGHT 1993 - COLORADO MEMORY SYSTEMS, INC.
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* ALL RIGHTS RESERVED.
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*
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******************************************************************************
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*
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* FILE: \SE\DRIVER\Q117KDI\NT\SRC\0X15A18.C
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*
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* FUNCTION: kdi_LockUnlockDMA
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*
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* PURPOSE:
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*
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* HISTORY:
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* $Log: J:\se.vcs\driver\q117kdi\nt\src\0x15a18.c $
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*
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* Rev 1.2 10 Aug 1994 09:53:22 BOBLEHMA
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* Changed cast from a dUDDWordPtr to dSDDWordPtr.
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*
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* Rev 1.1 18 Jan 1994 16:30:34 KEVINKES
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* Fixed compile errors and added debug changes.
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*
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* Rev 1.0 03 Dec 1993 14:25:10 KEVINKES
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* Initial Revision.
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*
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*****************************************************************************/
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#define FCT_ID 0x15A18
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#include "include\public\adi_api.h"
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#include "include\public\frb_api.h"
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#include "q117kdi\include\kdiwhio.h"
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#include "q117kdi\include\kdiwpriv.h"
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#include "include\private\kdi_pub.h"
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/*endinclude*/
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dVoid kdi_LockUnlockDMA
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(
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/* INPUT PARAMETERS: */
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KdiContextPtr kdi_context,
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dBoolean lock
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/* UPDATE PARAMETERS: */
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/* OUTPUT PARAMETERS: */
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)
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/* COMMENTS: *****************************************************************
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*
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* DEFINITIONS: *************************************************************/
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{
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/* DATA: ********************************************************************/
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KIRQL old_irql;
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/* CODE: ********************************************************************/
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if (kdi_context->adapter_object) {
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if (lock) {
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if (!kdi_context->adapter_locked) {
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/* Allocate an adapter channel for the I/O. */
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(dVoid) KeResetEvent(
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&kdi_context->allocate_adapter_channel_event );
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KeRaiseIrql( DISPATCH_LEVEL, &old_irql );
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IoAllocateAdapterChannel(
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kdi_context->adapter_object,
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kdi_context->device_object,
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kdi_context->number_of_map_registers,
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kdi_AllocateAdapterChannel,
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kdi_context );
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KeLowerIrql( old_irql );
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/* Wait for the adapter to be allocated. No */
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/* timeout; we trust the system to do it */
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/* properly - so KeWaitForSingleObject can't */
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/* return an error. */
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(dVoid) KeWaitForSingleObject(
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&kdi_context->allocate_adapter_channel_event,
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Executive,
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KernelMode,
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dFALSE,
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(dSDDWordPtr) dNULL_PTR );
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kdi_context->adapter_locked = dTRUE;
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}
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} else {
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if (kdi_context->adapter_locked) {
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/* Free the adapter channel that we just used. */
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KeRaiseIrql( DISPATCH_LEVEL, &old_irql );
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IoFreeAdapterChannel( kdi_context->adapter_object );
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KeLowerIrql( old_irql );
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kdi_context->adapter_locked = dFALSE;
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}
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}
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}
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return;
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}
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