diff options
| -rw-r--r-- | share/man/man9/bus_dma.9 | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/share/man/man9/bus_dma.9 b/share/man/man9/bus_dma.9 index e6c89cb..680c528 100644 --- a/share/man/man9/bus_dma.9 +++ b/share/man/man9/bus_dma.9 @@ -238,7 +238,6 @@ The allows the type of DMA operation that will be or has been performed to be communicated to the system so that the correct coherency measures are taken. -It is possible to combine different DMA operations by OR'ing them together. All operations specified below are performed from the DMA engine's point of view: .Bl -tag -width BUS_DMASYNC_POSTWRITE @@ -248,12 +247,18 @@ but prior to DMA read operations. .It Dv BUS_DMASYNC_PREWRITE Perform any synchronization required after an update of memory by the CPU but prior to DMA write operations. +.It Dv BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE +Perform any synchronization required prior to a combination of DMA read +and write operations. .It Dv BUS_DMASYNC_POSTREAD Perform any synchronization required after DMA read operations, but prior to CPU access of the memory. .It Dv BUS_DMASYNC_POSTWRITE Perform any synchronization required after DMA write operations, but prior to CPU access of the memory. +.It Dv BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE +Perform any synchronization required after a combination of DMA read +and write operations. .El .El .Sh FUNCTIONS |
