NDIS_BUFFER_TO_SPAN_PAGES (Windows Embedded CE 6.0)
1/6/2010
This macro determines how many physical pages of memory are being used to back a specified buffer.
Syntax
ULONG NDIS_BUFFER_TO_SPAN_PAGES(
PNDIS_BUFFER _Buffer
);
Parameters
- _Buffer
Specifies the buffer descriptor mapping the buffer.
Return Value
The return value is the Windows Embedded CE version, which is always 1.
Remarks
This macro is used by DMA drivers to determine how many physical discontiguities exist in a specified virtual buffer.
The NDIS_BUFFER_TO_SPAN_PAGES macro is defined as follows.
#define NDIS_BUFFER_TO_SPAN_PAGES(_Buffer) \
(MmGetMdlByteCount(_Buffer)==0 ? \
1 : \
(COMPUTE_PAGES_SPANNED( \
MmGetMdlVirtualAddress(_Buffer), \
MmGetMdlByteCount(_Buffer))))
Requirements
| Header | ndis.h |
| Windows Embedded CE | Windows CE .NET 4.0 and later |
See Also
Reference
Network Driver Macros
NDIS_BUFFER
NdisAllocateBuffer
NdisFreeBuffer
NdisBufferVirtualAddress