XP(4) - Device Drivers Manual (luna88k)

XP(4) - Device Drivers Manual (luna88k) #

XP(4) - Device Drivers Manual (luna88k)

NAME #

xp - HD647180X I/O processor

SYNOPSIS #

xp0 at mainbus0

DESCRIPTION #

The file /dev/xp is an mmap(2) capable interface to the memory area of the HD647180X I/O processor (so-called “XP”) on LUNA-88K and LUNA-88K2. Byte offsets in this file are interpreted as relative memory addresses of the I/O processor. The range should be between 0x0 and 0xffff.

The following ioctl(2) call applies to /dev/xp:

XPIOCDOWNLD struct xp_download

Load binary and reset I/O processor.

struct xp_download { u_int size; u_char *data; };

The size member specifies the loading binary size, in bytes. The data member points to the binary image.

FILES #

/dev/xp

ERRORS #

[EINVAL]

The specified size is 0 or more than the I/O processor’s memory size.

[ENOMEM]

Memory could not be allocated for loading.

SEE ALSO #

ioctl(2)

HISTORY #

The /dev/xp file first appeared in OpenBSD 6.1.

OpenBSD 7.5 - February 11, 2017