hwcpout man page on IRIX

hwcpout man page on IRIX

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hwcpout(D3X)							  hwcpout(D3X)

NAME
     hwcpout - copy data to I/O devices using 16-bit writes

SYNOPSIS
     #include <sys/types.h>
     #include <sys/systm.h>

     void hwcpout(caddr_t from, volatile unsigned short *to, int num_bytes);

DESCRIPTION
     hwcpout efficiently copies data from main memory to device memory using
     only 16-bit writes.

     hwcpout is similar to bcopy(D3) in that it does not verify the
     accessibility of the memory before attempting the transfer.  However,
     bcopy attempts to optimize for speed, and can generate 32-bit and 64-bit
     writes.

     When the device is mapped using a PIO map created with pio_mapalloc(D3X),
     use pio_bcopyout(D3X), which allows you to specify the transfer unit
     size.

   Return Values
     None

   See Also
     bcopy(D3), hwcpin(D3X), pio_bcopyout(D3X).

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