KnIoDmaBegin()

This function is declared in the coresrv/io/dma.h file.

Retcode KnIoDmaBegin(Handle rid, Handle *handle);

Allows the device to access the DMA buffer with the handle rid.

Output parameter handle contains the handle of this permission.

If successful, the function returns rcOk.

For a usage example, see KnIoDmaCreate().

To prevent a device from accessing the DMA buffer, you need to call the KnIoClose() function while passing the specified handle of the permission in this function.