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526 lines
12 KiB
526 lines
12 KiB
//
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// No Check-in Source Code.
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//
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// Do not make this code available to non-Microsoft personnel
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// without Intel's express permission
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//
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/**
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*** Copyright (C) 1996-97 Intel Corporation. All rights reserved.
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***
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*** The information and source code contained herein is the exclusive
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*** property of Intel Corporation and may not be disclosed, examined
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*** or reproduced in whole or in part without explicit written authorization
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*** from the company.
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**/
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/*++
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Copyright (c) 1995 Intel Corporation
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Module Name:
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simdma.c
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Abstract:
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This module implements the DMA support routines for the HAL DLL.
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Author:
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14-Apr-1995
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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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PADAPTER_OBJECT
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HalGetAdapter(
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IN PDEVICE_DESCRIPTION DeviceDescriptor,
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OUT PULONG NumberOfMapRegisters
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)
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/*++
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Routine Description:
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This function returns the appropriate adapter object for the DMA
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device. However, there is no DMA device in the simulation
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environment. Therefore, the function returns NULL to indicate
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failure.
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Arguments:
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DeviceDescriptor - Supplies a description of the deivce.
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NumberOfMapRegisters - Returns the maximum number of map registers which
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may be allocated by the device driver.
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Return Value:
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NULL
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--*/
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{
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return NULL;
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}
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NTSTATUS
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HalAllocateAdapterChannel(
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IN PADAPTER_OBJECT AdapterObject,
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IN PWAIT_CONTEXT_BLOCK Wcb,
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IN ULONG NumberOfMapRegisters,
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IN PDRIVER_CONTROL ExecutionRoutine
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)
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/*++
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Routine Description:
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As there is no DMA device in the simulation environment, this function
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is not supported.
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Arguments:
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AdapterObject - Pointer to the adapter control object to allocate to the
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driver.
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Wcb - Supplies a wait context block for saving the allocation parameters.
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The DeviceObject, CurrentIrp and DeviceContext should be initalized.
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NumberOfMapRegisters - The number of map registers that are to be allocated
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from the channel, if any.
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ExecutionRoutine - The address of the driver's execution routine that is
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invoked once the adapter channel (and possibly map registers) have been
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allocated.
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Return Value:
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Returns STATUS_NOT_SUPPORTED
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Notes:
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Note that this routine MUST be invoked at DISPATCH_LEVEL or above.
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--*/
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{
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return STATUS_NOT_SUPPORTED;
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}
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ULONG
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HalReadDmaCounter(
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IN PADAPTER_OBJECT AdapterObject
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)
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/*++
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Routine Description:
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This function reads the DMA counter and returns the number of bytes left
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to be transfered. As there is no DMA device, a value of zero is always
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returned.
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Arguments:
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AdapterObject - Supplies a pointer to the adapter object to be read.
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Return Value:
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Returns the number of bytes still be be transfered.
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--*/
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{
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return 0;
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}
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PVOID
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HalAllocateCommonBuffer(
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IN PADAPTER_OBJECT AdapterObject,
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IN ULONG Length,
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OUT PPHYSICAL_ADDRESS LogicalAddress,
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IN BOOLEAN CacheEnabled
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)
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/*++
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Routine Description:
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This function allocates the memory for a common buffer and maps so
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that it can be accessed by a master device and the CPU. As there
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is no DMA support, a value of NULL is always returned.
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Arguments:
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AdapterObject - Supplies a pointer to the adapter object used by this
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device.
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Length - Supplies the length of the common buffer to be allocated.
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LogicalAddress - Returns the logical address of the common buffer.
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CacheEnable - Indicates whether the memeory is cached or not.
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Return Value:
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Returns the virtual address of the common buffer. If the buffer cannot
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be allocated then NULL is returned.
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--*/
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{
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return NULL;
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}
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BOOLEAN
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HalFlushCommonBuffer(
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IN PADAPTER_OBJECT AdapterObject,
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IN ULONG Length,
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IN PHYSICAL_ADDRESS LogicalAddress,
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IN PVOID VirtualAddress
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)
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/*++
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Routine Description:
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This function is called to flush any hardware adapter buffers when the
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driver needs to read data written by an I/O master device to a common
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buffer. As there is no DMA support, that implies no buffers to flush
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and TRUE is always returned.
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Arguments:
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AdapterObject - Supplies a pointer to the adapter object used by this
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device.
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Length - Supplies the length of the common buffer. This should be the same
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value used for the allocation of the buffer.
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LogicalAddress - Supplies the logical address of the common buffer. This
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must be the same value return by HalAllocateCommonBuffer.
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VirtualAddress - Supplies the virtual address of the common buffer. This
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must be the same value return by HalAllocateCommonBuffer.
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Return Value:
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Returns TRUE if no errors were detected; otherwise, FALSE is return.
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--*/
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{
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return TRUE;
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}
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VOID
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HalFreeCommonBuffer(
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IN PADAPTER_OBJECT AdapterObject,
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IN ULONG Length,
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IN PHYSICAL_ADDRESS LogicalAddress,
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IN PVOID VirtualAddress,
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IN BOOLEAN CacheEnabled
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)
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/*++
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Routine Description:
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This function frees a common buffer and all of the resouces it uses.
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There is no buffer to be freed in the simulation environment. The
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function simply returns.
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Arguments:
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AdapterObject - Supplies a pointer to the adapter object used by this
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device.
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Length - Supplies the length of the common buffer. This should be the same
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value used for the allocation of the buffer.
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LogicalAddress - Supplies the logical address of the common buffer. This
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must be the same value return by HalAllocateCommonBuffer.
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VirtualAddress - Supplies the virtual address of the common buffer. This
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must be the same value return by HalAllocateCommonBuffer.
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CacheEnable - Indicates whether the memeory is cached or not.
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Return Value:
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None
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--*/
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{
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return;
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}
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PVOID
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HalAllocateCrashDumpRegisters(
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IN PADAPTER_OBJECT AdapterObject,
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IN PULONG NumberOfMapRegisters
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)
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/*++
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Routine Description:
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This routine is called during the crash dump disk driver's initialization
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to allocate a number map registers permanently. It is not supported and
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NULL is always returned to indicate allocation failure. The lack of this
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capability implies that the crash dump disk driver is not supported.
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Arguments:
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AdapterObject - Pointer to the adapter control object to allocate to the
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driver.
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NumberOfMapRegisters - Number of map registers requested. This field
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will be updated to reflect the actual number of registers allocated
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when the number is less than what was requested.
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Return Value:
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Returns NULL.
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--*/
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{
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return NULL;
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}
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BOOLEAN
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IoFlushAdapterBuffers(
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IN PADAPTER_OBJECT AdapterObject,
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IN PMDL Mdl,
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IN PVOID MapRegisterBase,
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IN PVOID CurrentVa,
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IN ULONG Length,
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IN BOOLEAN WriteToDevice
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)
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/*++
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Routine Description:
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This routine flushes the DMA adapter object buffers. In the simulation
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environment, nothing needs to be done and TRUE is always returned.
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Arguments:
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AdapterObject - Pointer to the adapter object representing the DMA
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controller channel.
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Mdl - A pointer to a Memory Descriptor List (MDL) that maps the locked-down
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buffer to/from which the I/O occured.
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MapRegisterBase - A pointer to the base of the map registers in the adapter
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or DMA controller.
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CurrentVa - The current virtual address in the buffer described the the Mdl
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where the I/O operation occurred.
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Length - Supplies the length of the transfer.
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WriteToDevice - Supplies a BOOLEAN value that indicates the direction of
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the data transfer was to the device.
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Return Value:
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TRUE - No errors are detected so the transfer must succeed.
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--*/
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{
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return TRUE;
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}
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VOID
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IoFreeAdapterChannel(
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IN PADAPTER_OBJECT AdapterObject
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)
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/*++
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Routine Description:
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This routine is invoked to deallocate the specified adapter object.
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Any map registers that were allocated are also automatically deallocated.
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No checks are made to ensure that the adapter is really allocated to
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a device object. However, if it is not, then kernel will bugcheck.
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If another device is waiting in the queue to allocate the adapter object
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it will be pulled from the queue and its execution routine will be
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invoked.
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In the simulation environment, this routine does nothing and returns.
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Arguments:
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AdapterObject - Pointer to the adapter object to be deallocated.
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Return Value:
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None.
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--*/
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{
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return;
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}
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VOID
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IoFreeMapRegisters(
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PADAPTER_OBJECT AdapterObject,
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PVOID MapRegisterBase,
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ULONG NumberOfMapRegisters
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)
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/*++
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Routine Description:
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This routine deallocates the map registers for the adapter. If there are
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any queued adapter waiting for an attempt is made to allocate the next
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entry.
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In the simulation environment, the routine does nothing and returns.
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Arguments:
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AdapterObject - The adapter object to where the map register should be
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returned.
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MapRegisterBase - The map register base of the registers to be deallocated.
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NumberOfMapRegisters - The number of registers to be deallocated.
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Return Value:
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None
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--+*/
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{
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return;
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}
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PHYSICAL_ADDRESS
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IoMapTransfer(
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IN PADAPTER_OBJECT AdapterObject,
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IN PMDL Mdl,
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IN PVOID MapRegisterBase,
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IN PVOID CurrentVa,
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IN OUT PULONG Length,
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IN BOOLEAN WriteToDevice
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)
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/*++
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Routine Description:
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This routine is invoked to set up the map registers in the DMA controller
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to allow a transfer to or from a device.
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In the simulation environment, no map register is supported and a
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logical address of zero is always returned.
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Arguments:
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AdapterObject - Pointer to the adapter object representing the DMA
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controller channel that has been allocated.
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Mdl - Pointer to the MDL that describes the pages of memory that are
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being read or written.
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MapRegisterBase - The address of the base map register that has been
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allocated to the device driver for use in mapping the transfer.
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CurrentVa - Current virtual address in the buffer described by the MDL
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that the transfer is being done to or from.
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Length - Supplies the length of the transfer. This determines the
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number of map registers that need to be written to map the transfer.
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Returns the length of the transfer which was actually mapped.
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WriteToDevice - Boolean value that indicates whether this is a write
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to the device from memory (TRUE), or vice versa.
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Return Value:
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Returns the logical address that should be used bus master controllers.
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--*/
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{
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PHYSICAL_ADDRESS result;
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result.HighPart = 0;
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result.LowPart = 0;
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return (result);
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}
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ULONG
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HalGetDmaAlignmentRequirement (
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VOID
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)
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/*++
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Routine Description:
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This function returns the alignment requirements for DMA transfers on
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host system.
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Arguments:
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None.
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Return Value:
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The DMA alignment requirement is returned as the fucntion value.
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--*/
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{
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return 8;
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}
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VOID
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HalFlushIoBuffers (
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IN PMDL Mdl,
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IN BOOLEAN ReadOperation,
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IN BOOLEAN DmaOperation
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)
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/*++
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Routine Description:
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This function flushes the I/O buffer specified by the memory descriptor
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list from the data cache on the current processor.
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Arguments:
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Mdl - Supplies a pointer to a memory descriptor list that describes the
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I/O buffer location.
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ReadOperation - Supplies a boolean value that determines whether the I/O
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operation is a read into memory.
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DmaOperation - Supplies a boolean value that determines whether the I/O
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operation is a DMA operation.
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Return Value:
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None.
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--*/
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{
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//
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// BUGBUG: This still needs to be done
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//
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}
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