K 10
svn:author
V 6
brooks
K 8
svn:date
V 27
2018-04-09T22:59:10.184041Z
K 7
svn:log
V 596
Refactor PCIOCGETCONF for improved readability.

The code now has a single, consistant flow for all three ioctl
variants. ifdefs and for pre-FreeBSD-7 compatability are moved to
functions and macros. So the flow is alwasy the same, we impose
the cost of allocating, copying to, updating from, and freeing a
copy of struct pci_conf_io on all paths.

This change will allow PCIOCGETCONF32 support currently in
sys/compat/freebsd32/freebsd32_ioctl.c to be moved here.

Reviewed by:	kib, jhb
Obtained from:	CheriBSD
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14978

END