NdisBufferVirtualAddress (Windows Embedded CE 6.0)

1/6/2010

This function returns the base virtual address for the buffer mapped by a given buffer descriptor. It maps the physical pages described by the given buffer descriptor onto system space if these pages are not already mapped to system space.

Syntax

PVOID NdisBufferVirtualAddress(
  PNDIS_BUFFER Buffer
);

Parameters

• Buffer
  [in] Points to a buffer descriptor from which the base virtual address is to be returned.

Return Value

Returns the base system-space virtual address that maps the physical pages described by the given buffer descriptor.

Remarks

Drivers should call NdisBufferVirtualAddressSafe instead of NdisBufferVirtualAddress. NDIS 5.1 miniport drivers must call NdisBufferVirtualAddressSafe instead of NdisBufferVirtualAddress. Unlike NdisBufferVirtualAddress, NdisBufferVirtualAddressSafe does not cause a bug check if system resources are low or exhausted.

Drivers of PIO devices call this routine to translate a virtual address range, described by the buffer, for a user buffer to a system-space address range.

The returned base address has the same offset as the virtual address in the buffer.

Requirements

See Also

Reference

NDIS Library Functions
NdisAllocateBuffer
NdisAllocateBufferPool
NdisAllocateMemory
NdisFreeBuffer
NdisBufferVirtualAddressSafe