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PCEXMEM(4) Device Drivers Manual (luna88k) PCEXMEM(4)

pcexmem, pcexio —
NEC PC-9801 extension board slot

pcex0 at cbus0

The file /dev/pcexmem is an mmap(2) capable interface to the memory area of the installed board at "NEC PC-9801 extension board slot" on LUNA-88K2. Byte offsets in this file are interpreted as relative memory addresses of the installed board. The range should be between 0x0 and 0xffffff.

The I/O port area of the installed board is accessed via the file /dev/pcexio in the same manner as /dev/pcexmem. The range should be between 0x0 and 0xffff.

The following ioctl(2) calls apply to /dev/pcexmem and /dev/pcexio in order to handle interrupts of this extension slot. Currently 7 levels of interrupt (0 to 6) are supported.

u_int *
Register the specified interrupt level with this driver to handle.
u_int *
Unregister the specified interrupt level with this driver.
u_int *
Wait for the interrupt with the specified level.

/dev/pcexmem
 
/dev/pcexio
 

[]
PCEXWAITINT timeouts (currently 1 second).

ioctl(2)

The /dev/pcexmem and /dev/pcexio files first appeared in OpenBSD 5.6.
December 8, 2014 OpenBSD-current