Make a debug printf compile for all platforms

fix warnings, printf formats, etc.

reduce size by 1K by sharing the ls code.

Apply the following patch submitted by Evgeniy Ivanov:
http://mail-index.NetBSD.org/tech-kern/2011/12/15/msg012226.html
http://mail-index.NetBSD.org/tech-kern/2011/12/17/msg012229.html

- add 'ls' o

Apply the following patch submitted by Evgeniy Ivanov:
http://mail-index.NetBSD.org/tech-kern/2011/12/15/msg012226.html
http://mail-index.NetBSD.org/tech-kern/2011/12/17/msg012229.html

- add 'ls' op to struct fs_ops to support ls command on each fs,
enabled by -DLIBSA_ENABLE_LS_OP and SAMISCMAKEFLAGS+="SA_ENABLE_LS_OP=yes"
in libsa
- split sys/lib/libsa/ufs_ls.c into UFS specific part and MI part (ls.c)
that opens the target fs and calls fs-depedent XXX_ls() functions
- add a ls op for ext2fs
(all other fs than ufs and ext2fs don't have actual ls ops yet)
- replace existing MD ufs_ls() calls with this new MI ls()

The original patch was written for i386 and ext2fs.
zaurus zboot has been tested by nonaka@.
ews4800mips and x68k loaders have been tested by me (with several fixes).
landisk might be okay since it was almost copied from i386.

XXX1: "ls" op in fs_ops looks a bit inconsistent, but we will be able to
replace it with real fs ops like readdir if it's really worth
XXX2: someone might have to check sys/arch/ia64/stand/efi/libefi/efifs_ls.c

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Add an optional MD calling convention flag for use in libsa when space
optimisation is critical. Use this on i386 to switch to register passing
calling convention for the file system entry points and

Add an optional MD calling convention flag for use in libsa when space
optimisation is critical. Use this on i386 to switch to register passing
calling convention for the file system entry points and most assembler
call backs that have to preserve at least 3 registers.

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Remove __P().

For the x86 boot loader, autoload a kernel module corresponding to the
root file system type.

- use mem* instead of b* routines, and kill the b* routines.
- use the mem* routines from libc.
XXX: There will be some lossage, but I am fixing it.

style, indent, and ANSI-fy.

Add missing newlines to debug messages.

remove nqnfs from comments. from Arnaud Lacombe.
(no functional changes.)

free -> dealloc

merge ktrace-lwp.

nuke trailing whitespace

Um, undo last; libsa printf doesn't do %z.

Use the %zu format for size_t printing instead of cast + %lu.

Cast size_t to u_long before printing, and use %lu instead of %d as format.
Fixes compilation on alpha.

Fix signed/unsigned warnings.

make 'path' argument to ufs_open 'const char *' and fix the fallout.

Move some stuff into .rodata.

no need to include "netif.h" anymore
(shared interface stuff is in iodesc.h, included by net.h)

Kill some more register declarations.

Remove leading '/' from pathnames, using same logic as ufs.c. Allows new
style (but not yet committed) pmax bootblocks to open "/boot.pmax" on an
ISO image. Same problem reported for NFS by Jason T

Remove leading '/' from pathnames, using same logic as ufs.c. Allows new
style (but not yet committed) pmax bootblocks to open "/boot.pmax" on an
ISO image. Same problem reported for NFS by Jason Thorpe.

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Backout my libsa changes.

Update for the improvements to libsa, and don't reference libkern.h.