Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Use nitems() instead of sizeof(name) / sizeof(*name).

MFC after: 2 weeks.

Fix dumpon compatibility with dumpdev kenv

The dumpdev kenv supports devices without the /dev/ prefix, fix dumpon to
also support this which is required after r288153.

MFC after: 1 week
Sponsored by: Multiplay

Document that you can use -v along with -l.

Noticed by: pjd

Add an option to display the current dump device via dumpon -l.

MFC after: 2 weeks

Whitespace and style nits.

With minidumps, the dumping partition could be smaller than physical
memory, so checking the size of the partition is not necessary.

Tested by: kris

Promote mediasize and physmem to uintmax_t when comparing them.

Whitespace nit.

Verify that the specified device is at least as large as hw.physmem.

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core, imp

Use __FBSDID() to quiet GCC 3.3 warnings.

unbreak build: include string.h for strcmp prototype.

Rename DIOCGKERNELDUMP to DIOCSKERNELDUMP as it strictly speaking
is a "set" not a "get" operation.

Sponsored by: DARPA & NAI Labs.

Move generic disk ioctls from <sys/disklabel.h> to <sys/disk.h>.

Sponsored by: DARPA & NAI Labs

Here follows the new kernel dumping infrastructure.

Caveats:

The new savecore program is not complete in the sense that it emulates
enough of the old savecores features to do the job, but implements none
of the options yet.

I would appreciate if a userland hacker could help me out getting savecore
to do what we want it to do from a users point of view, compression,
email-notification, space reservation etc etc. (send me email if
you are interested).

Currently, savecore will scan all devices marked as "swap" or "dump" in
/etc/fstab _or_ any devices specified on the command-line.

All architectures but i386 lack an implementation of dumpsys(), but
looking at the i386 version it should be trivial for anybody familiar
with the platform(s) to provide this function.

Documentation is quite sparse at this time, more to come.

Sponsored by: DARPA, NAI Labs

Details:

Dumpon now opens the device and uses ioctl(DIOCGKERNELDUMP) to set it
to be the dumpdevice. When "off" is set, /dev/null is used.

o __P
o Strict ANSI declarations.
o return (foo);
o main (int, char *[])

Include missing header files which define functions for which gcc has
builtins (e.g., exit, strcmp).

Remove unused #include.

The dumpon sysctl only accept cdevs thse days.

Submitted by: bde

Accept both types of devices to work with older kernels too
Fix confusing message

Convert dumpon to work on character devices instead of block devices.

NB: You may need to change your /etc/rc.conf!

$Id$ -> $FreeBSD$

Capitalize at the start of sentence. Add rcsid. Remove unused #includes.
Use `dumpon' instead of argv[0].

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Remove trailing whitespace.

My utility to specify where you want crash dumps to go. More user
and kernel support to follow.