pio_andh_rmw man page on IRIX

pio_andh_rmw man page on IRIX

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pio_andh_rmw(D3X)					     pio_andh_rmw(D3X)

NAME
     pio_andh_rmw - half-word I/O-bus read-modify-write cycle routine

SYNOPSIS
     pio_andh_rmw(piomap_t *piomap, iopaddr_t pioaddr, unsigned short mask);

DESCRIPTION
     pio_andh_rmw performs an atomic I/O-bus read-modify-write operation. This
     function reads a half-word from the address given by the pioaddr
     argument. The function then ANDs the half-word with the mask specified by
     mask, and writes the result to the address, pioaddr. To prevent any other
     I/O-bus cycles during this operation, this function locks the I/O bus.
     piomap is the PIO map returned from pio_mapalloc(D3X).

   Note
     The address must be correctly aligned for the given transfer.

   See Also
     pio_orb_rmw(D3X), pio_andh_rmw(D3X), pio_andw_rmw(D3X)

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