ULONG
KeGetDcacheFillSize(
);
KeGetDcacheFillSize returns the microprocessor's data cache-line boundary in bytes.
Comments
Drivers that do DMA can use the information returned by this routine to avoid cache-line tearing during DMA transfer operations.
Such a driver can use the value returned by KeGetDcacheFillSize to allocate cache-aligned buffers for DMA. Such a driver also can use the value returned by KeGetDcacheFillSize during DMA transfer operations.
For example, in a platform with the processor's data cache aligned on a 16-byte boundary, a DMA device driver should transfer data as an integral number of 16-byte blocks to or from a buffer aligned on a 16-byte boundary if at all possible. Otherwise, cache-line tearing occurs during DMA transfers, which can cause data integrity problems for both the driver and the system.
See Also
ExAllocatePool, HalGetAdapter, IoMapTransfer, KeFlushIoBuffers