105 lines
1.5 KiB
C
105 lines
1.5 KiB
C
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Copyright (c) 1995 Intel Corporation
|
|||
|
|
|
|||
|
|
Module Name:
|
|||
|
|
|
|||
|
|
i64dma.c
|
|||
|
|
|
|||
|
|
Abstract:
|
|||
|
|
|
|||
|
|
This module implements the DMA support routines for the HAL DLL.
|
|||
|
|
|
|||
|
|
Author:
|
|||
|
|
|
|||
|
|
14-Apr-1995
|
|||
|
|
|
|||
|
|
Environment:
|
|||
|
|
|
|||
|
|
Kernel mode
|
|||
|
|
|
|||
|
|
Revision History:
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
#include "halp.h"
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
VOID
|
|||
|
|
HalFlushIoBuffers (
|
|||
|
|
IN PMDL Mdl,
|
|||
|
|
IN BOOLEAN ReadOperation,
|
|||
|
|
IN BOOLEAN DmaOperation
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
This function flushes the I/O buffer specified by the memory descriptor
|
|||
|
|
list from the data cache on the current processor.
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
Mdl - Supplies a pointer to a memory descriptor list that describes the
|
|||
|
|
I/O buffer location.
|
|||
|
|
|
|||
|
|
ReadOperation - Supplies a boolean value that determines whether the I/O
|
|||
|
|
operation is a read into memory.
|
|||
|
|
|
|||
|
|
DmaOperation - Supplies a boolean value that determines whether the I/O
|
|||
|
|
operation is a DMA operation.
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
None.
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
//
|
|||
|
|
//
|
|||
|
|
// In IA64 systems, DMA is coherent with Dcache and Icache.
|
|||
|
|
// In PIO, Dcache is coherent and Icache is NOT coherent.
|
|||
|
|
// Only on Page read using PIO Icache coherency is needed to be
|
|||
|
|
// maintained by software. So, HalFlushIoBuffer will flush the Icache
|
|||
|
|
// only on Page read using PIO.
|
|||
|
|
//
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
return;
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
ULONG
|
|||
|
|
HalGetDmaAlignmentRequirement (
|
|||
|
|
VOID
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
This function returns the alignment requirements for DMA transfers on
|
|||
|
|
host system.
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
None.
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
The DMA alignment requirement is returned as the fucntion value.
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
|
|||
|
|
return 1;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|