whitespace fixes, no code change.

spelling

ok gnezdo@ semarie@ mpi@

don't let the retguard skip region exceed the space we have reserved for
it in the piglet during unhibernate. Missed this block during the previous
commit. We'll panic, which will likely just reboot

don't let the retguard skip region exceed the space we have reserved for
it in the piglet during unhibernate. Missed this block during the previous
commit. We'll panic, which will likely just reboot the machine, but that's
better than trashing a chunk and causing mystery errors later.

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Save and restore retguard area during hibernate unpack. This copies the
original retguard data to the piglet and bcopys it back in place
immediately before resuming via the ACPI Sx trampoline.

ok de

Save and restore retguard area during hibernate unpack. This copies the
original retguard data to the piglet and bcopys it back in place
immediately before resuming via the ACPI Sx trampoline.

ok deraadt, guenther, tested by many.

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print why the signature block check of an unhibernate attempt failed, to
let people know what changed.

ok kettenis, phessler

calculate a "sum" based upon pointers to functions all over the kernel,
so that an unhibernate kernel can detect if it is running with the
kernel it booted.
ok mlarkin

If hibernate_alloc() encounters a problem it should undo the partial
work.
ok mlarkin kettenis

move from RB macros to RBT functions

move the vm_page struct from being stored in RB macro trees to RBT functions

vm_page structs go into three trees, uvm_objtree, uvm_pmr_addr, and
uvm_pmr_size. all these have been moved to RBT code.

move the vm_page struct from being stored in RB macro trees to RBT functions

vm_page structs go into three trees, uvm_objtree, uvm_pmr_addr, and
uvm_pmr_size. all these have been moved to RBT code.

this should give us a decent chunk of code space back.

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Fix hibernation - make stack protector writable during resume
Committing for guenther@ because he is on United and apparently
they break ssh (as well as guitars)

ok deraadt@ in the car from cambridge

Fix undefined behaviour when comparing pointers by casting them to vaddr_t.

OK mlarkin@

Clarify that hibernate_resume must be called with interrupts enabled.

Preserve a page's worth of random data on hibernate resume. Used to improve
entropy after resuming.

Tested on i386 and amd64.
ok deraadt@

New framework that allows hibernate to pass in entropy from it's fresh
boot.
ok mlarkin

Fix a hibernate crash on some machines due to unmapping a page that
may not have been mapped previously (in the failure to hibernate case).

Also ensure that the lowmem ptp is mapped in all cases (no

Fix a hibernate crash on some machines due to unmapping a page that
may not have been mapped previously (in the failure to hibernate case).

Also ensure that the lowmem ptp is mapped in all cases (not just MP).

ok kettenis

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hibernate_suspend() should not pmap_kremove by itself; hibernate_free()
must do that. otherwise, pmap_kremove is called twice. i386 in particular
does not tolerate that, found by sebastia
ok mlarki

hibernate_suspend() should not pmap_kremove by itself; hibernate_free()
must do that. otherwise, pmap_kremove is called twice. i386 in particular
does not tolerate that, found by sebastia
ok mlarkin kettenis

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fix an error in piglet allocation when requesting an alignment < PAGE_SIZE
(which we never did, but it was a bug nonetheless).

ok kettenis, deraadt

remove lock.h from uvm_extern.h. another holdover from the simpletonlock
era. fix uvm including c files to include lock.h or atomic.h as necessary.
ok deraadt

Replace a plethora of historical protection options with just
PROT_NONE, PROT_READ, PROT_WRITE, and PROT_EXEC from mman.h.
PROT_MASK is introduced as the one true way of extracting those bits.
Remove

Replace a plethora of historical protection options with just
PROT_NONE, PROT_READ, PROT_WRITE, and PROT_EXEC from mman.h.
PROT_MASK is introduced as the one true way of extracting those bits.
Remove UVM_ADV_* wrapper, using the standard names.
ok doug guenther kettenis

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No reason to have things like the hibernate allocation area and chunk
ordering regions mapped executable, so remove those permissions.

ok deraadt@

Unmap the hibernate hiballoc page after we are done with it.

ok deraadt, kettenis

Remove some unused/unneeded code.

Use the global piglet address variables as sparingly as possible to avoid
redundant copies of the same information. No functional change.

Also add some comments as to how these globals are used.

No need to reserve separate KVA ranges for the RLE and copy pages in
hibernate anymore.

fix some data type mismatches in the zlib paths in hibernate