Reword some wrong comments and some improperly formatted comments and add
information about piglet memory layout. No functional changes.

Fix a bad comparison when calculating the size of the hibernate signature
block

ok deraadt@

Style, no functional changes.

Discussed with mlarkin@.

Add a hibernate HIB_DONE op. After the memory-side-effect driver finishes
IO to the disk, DVACT_RESUME the controller back to normal operation. That
allows us to do the full DVACT_POWERDOWN sequenc

Add a hibernate HIB_DONE op. After the memory-side-effect driver finishes
IO to the disk, DVACT_RESUME the controller back to normal operation. That
allows us to do the full DVACT_POWERDOWN sequence afterwards.
ok mlarkin

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increase the number of pages used to hold the chunk ordering map and change
the index type from int to short. Allows amd64 to hibernate with up to 64GB
phys memory

fix an error in the amd64 asm unhibernate code and a slight adjustment to
the MI hibernate code to handle 64 bit archs

say that we are unhibernating..

Back out my workaround from r1.43 now that jsing has committed a better fix.

Make sure we have a swap partition before trying to read or write
hibernate info.

ok mlarkin@ stsp@

Don't panic in hibernate resume if no swap partition exists on the root disk.
ok mlarkin

Temporarily don't do RLE page encoding in hibernate to fix some unpacking
corruption seen earlier. This makes hibernate much slower but seems to fix
the corruption problems seen on all machines we've

Temporarily don't do RLE page encoding in hibernate to fix some unpacking
corruption seen earlier. This makes hibernate much slower but seems to fix
the corruption problems seen on all machines we've tested on.

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Enable the swap checker for hibernate

DVACT_SUSPEND must be done at cold with interrupts disabled. Failure
to read a hibernate image should restore the spl
ok mlarkin

Quiesce and suspend devices in the resuming kernel for hibernate.

ok deraadt@

Make hibernate_free() safe to be called even if hibernate areas
allocation failed
ok mlarkin

Reorganize some hibernate functions for easier readability.
Fix some incorrect/old comments.

ok deraadt@

use regular i/o functions in the hibernate resume path. ahci(4) hibernate
i/o will not mix with regular i/o so it can only be used in the hibernate
path.

ok deraadt@ mlarkin@

Fix some hibernate issues on machines with > 3.5GB phys mem

ok deraadt@

hibernate: fix lock/unlock mismatch

Unlock missed an 'f', which caused it to unlock the in-use pageqs, rather
than the free pageqs as it was supposed to.

Fix an integer math error when using the result of uvm_page_rle, and
at the same time increase said function's max RLE page count return value.

Add hooks in the right places to call the hibernate su

Fix an integer math error when using the result of uvm_page_rle, and
at the same time increase said function's max RLE page count return value.

Add hooks in the right places to call the hibernate suspend and resume
routines, so that we can enable hibernation with a HIBERNATE option
line in GENERIC and appropriate acpi.c goo.

discussed on and off with deraadt@ over the past few months

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ready this for big-endian support later on
ok mlarkin

Only free the piglet on hibernate fail if we are suspending.

clamp uvm_page_rle() to 255 pages at a time
ok mlarkin

Ensure we are unpacking the right source address after skipping a range of
RLE pages in hibernate.

ok deraadt@

no need to zero all the free pages since we will be skipping them with
rle.

noticed by jasper