pio_orb_rmw(D3X)pio_orb_rmw(D3X)NAMEpio_orb_rmw - I/O-bus read-modify-write cycle routines
SYNOPSIS
pio_orb_rmw(piomap_t *piomap, iopaddr_t pioaddr, unsigned char mask);
DESCRIPTION
This function perform I/O-bus atomic read-modify-write operations.
pio_orb_rmw(D3X), pio_orh_rmw(D3X), or pio_orw_rmw(D3X) read a byte,
half-word, or word (respectively) from the address pointed to by pioaddr.
The routine then ORs the byte, half-word, or word with the mask in mask
and writes the result to the address, pioaddr (overwriting the original
value). piomap is the PIO map returned from pio_mapalloc(D3X).
The address, pioaddr, must be correctly aligned for the given transfer.
Return Values
None
Note
To prevent any other I/O-bus cycles during this operation, these routines
lock the I/O bus.
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