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implemented HalAllocateCommonBuffer

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svn path=/trunk/; revision=5974
This commit is contained in:
Vizzini 2003-09-04 06:45:38 +00:00
parent 02ee3e3600
commit f0496db9c5
1 changed files with 27 additions and 7 deletions
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34
reactos/hal/halx86/dma.c
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@ -1,10 +1,10 @@
/* $Id: dma.c,v 1.5 2003/08/20 04:18:31 royce Exp $
/* $Id: dma.c,v 1.6 2003/09/04 06:45:38 vizzini Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/hal/x86/dma.c
* PURPOSE: DMA functions
* PROGRAMMER: David Welch (welch@mcmail.com)
* PROGRAMMERS: David Welch (welch@mcmail.com)
* UPDATE HISTORY:
* Created 22/05/98
*/
@ -26,10 +26,10 @@ ADAPTER_OBJECT AdapterObjects[] = {
/* FUNCTIONS *****************************************************************/
PVOID STDCALL
HalAllocateCommonBuffer (PADAPTER_OBJECT AdapterObject,
ULONG Length,
PPHYSICAL_ADDRESS LogicalAddress,
BOOLEAN CacheEnabled)
HalAllocateCommonBuffer (PADAPTER_OBJECT AdapterObject,
ULONG Length,
PPHYSICAL_ADDRESS LogicalAddress,
BOOLEAN CacheEnabled)
/*
* FUNCTION: Allocates memory that is visible to both the processor(s) and
* a dma device
@ -42,9 +42,25 @@ HalAllocateCommonBuffer (PADAPTER_OBJECT AdapterObject,
* CacheEnabled = Specifies if the memory can be cached
* RETURNS: The base virtual address of the memory allocated
* NULL on failure
* NOTES:
* CacheEnabled is ignored - it's all cache-disabled (like in NT)
*/
{
UNIMPLEMENTED;
PHYSICAL_ADDRESS HighestAddress;
PVOID BaseAddress;
HighestAddress.u.HighPart = 0;
HighestAddress.u.LowPart = -1;
BaseAddress = MmAllocateContiguousMemory(Length, HighestAddress);
if (!BaseAddress)
return 0;
*LogicalAddress = MmGetPhysicalAddress(BaseAddress);
/* is this supposed to be tracked in the adapter object? */
return BaseAddress;
}
BOOLEAN STDCALL
@ -83,12 +99,15 @@ HalGetAdapter (PDEVICE_DESCRIPTION DeviceDescription,
* allocate for DMA transfer operations
* RETURNS: The allocated adapter object on success
* NULL on failure
* TODO:
* Figure out what to do with the commented-out cases
*/
{
/* Validate parameters in device description, and return a pointer to
the adapter object for the requested dma channel */
if( DeviceDescription->Version != DEVICE_DESCRIPTION_VERSION )
return NULL;
/*
if( DeviceDescription->Master )
return NULL;
if( DeviceDescription->ScatterGather )
@ -99,6 +118,7 @@ HalGetAdapter (PDEVICE_DESCRIPTION DeviceDescription,
return NULL;
if( DeviceDescription->InterfaceType != Isa )
return NULL;
*/
/* if( DeviceDescription->DmaWidth != Width8Bits )
return NULL;*/
*NumberOfMapRegisters = 0x10;