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 #
HISTORY #
The /dev/xp file first appeared in OpenBSD 6.1.
OpenBSD 7.5 - February 11, 2017