pgalloc_align: make page size min alignment

Fix callers and tighten assert.

pgalloc: fix comment

no fuctional change

carveandlink_freechunk -> freechunk_link

more descriptional name
no functional change

pgalloc: use builtin_ctz/clz instead of for loops.

Add bmk_pgalloc_align()

Can be used to allocate chunks with alignment > size.

ctassert that PAGES_PER_MAPWORD is a power of two

assert that allocations are allocated in map

control debug print spam with a variable

Add bmk_pgalloc_dumpstats()

dumps pgalloc stats (in case someone didn't guess from the name)

chunk_head -> chunk (simple)

no functional change intended

use queue.h instead of homegrown linked list

Don't overload variable

plus other cosmetic nits

Use same indexes everywhere.

fold common code into a subroutine

add comment on why FREELISTS_LEVELS is like it is

print_chunks() is a bit too silly to be kept alive

Bring back chuck magic checks.

Problem they caught should be fixed now.

prevent integer truncation in allocated_in_map()

Revert "Put a magic number into the allocator chunks."

Breaks Travis CI tests. No idea why, so revert so that the
situation can be investigated.

This reverts commit 7dfdbb170ed8fffff11b2ad12a288e976b55a89d.

don't overallow bitmap if memory starts from high up

Bunch of misc improvements

* misnamed FREELIST_SIZE
* misused FREELIST_EMPTY
* debug prints
* comments

Allocate freelist head/tail at compile-time.

Put a magic number into the allocator chunks.

Use that as an internal invariant. Free chunks must contain
the magic number.

chunk_tail is not used in pgalloc => g/c

introduce order2size() for common calculation

Get rid of stupid_t and hide pointer arith in macros.

Actually fix the "is address managed?" check

No, for real this time.

Make sanity_check() compile again.

Run it after every allocation and deallocation if BMK_PGALLOC_DEBUG
is turned on.

Record min/max addresses as pages instead of bytes

They're always used as pages...

g/c no longer valid comment

Make sure we don't under/overflow our chunk merges.

Make sure we don't access alloc_bitmap[] beyond its bounds.

no casting for void *

Print alloc/free when BMK_PGALLOC_DEBUGging

make BMK_PGALLOC_DEBUG code compile

Retire bmk_page{size,shift}, use BMK_PCPU_PAGE_{SIZE,SHIFT}.

Latter are compile-time constants.

Provide page allocator as part of bmk-core.

Platforms now share common page allocator code.