This is the start of the FreeBSD/x86_64 kernel.

sys/conf/Makefile.amd64

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+# Makefile.x86_64 -- with config changes.
+# Copyright 1990 W. Jolitz
+#	from: @(#)Makefile.i386	7.1 5/10/91
+#	from FreeBSD: src/sys/conf/Makefile.i386,v 1.255 2002/02/20 23:35:49
+# $FreeBSD$
+#
+# Makefile for FreeBSD
+#
+# This makefile is constructed from a machine description:
+#	config machineid
+# Most changes should be made in the machine description
+#	/sys/x86_64/conf/``machineid''
+# after which you should do
+#	 config machineid
+# Generic makefile changes should be made in
+#	/sys/conf/Makefile.x86_64
+# after which config should be rerun for all machines.
+#
+
+# Which version of config(8) is required.
+%VERSREQ=	500010
+
+STD8X16FONT?=	iso
+
+.if !defined(S)
+.if exists(./@/.)
+S=	./@
+.else
+S=	../../..
+.endif
+.endif
+.include "$S/conf/kern.pre.mk"
+
+MKMODULESENV+= MACHINE=x86_64
+
+%BEFORE_DEPEND
+
+%OBJS
+
+%FILES.c
+
+%FILES.s
+
+%FILES.m
+
+%CLEAN
+
+%RULES
+
+.include "$S/conf/kern.post.mk"

sys/conf/files.amd64

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+# This file tells config what files go into building a kernel,
+# files marked standard are always included.
+#
+# $FreeBSD$
+#
+# The long compile-with and dependency lines are required because of
+# limitations in config: backslash-newline doesn't work in strings, and
+# dependency lines other than the first are silently ignored.
+#
+
+dev/kbd/atkbd.c			optional	atkbd
+dev/kbd/atkbdc.c		count		atkbdc
+dev/kbd/kbd.c			optional	atkbd
+dev/kbd/kbd.c			optional	kbd
+dev/kbd/kbd.c			optional	sc
+dev/kbd/kbd.c			optional	ukbd
+dev/kbd/kbd.c			optional	vt
+dev/sio/sio.c			optional	sio
+dev/sio/sio_isa.c		optional	sio isa
+dev/sio/sio_pccard.c		optional	sio card
+dev/sio/sio_pccard.c		optional	sio pccard
+dev/sio/sio_pci.c		optional	sio pci
+dev/sio/sio_puc.c		optional	sio puc
+dev/syscons/apm/apm_saver.c	optional	apm_saver apm
+dev/syscons/schistory.c		count		sc
+dev/syscons/scmouse.c		optional	sc
+dev/syscons/scterm.c		optional	sc
+dev/syscons/scterm-dumb.c	optional	sc
+dev/syscons/scterm-sc.c		optional	sc
+dev/syscons/scvesactl.c		optional	sc vga vesa
+dev/syscons/scvgarndr.c		optional	sc vga
+dev/syscons/scvidctl.c		optional	sc
+dev/syscons/scvtb.c		optional	sc
+dev/syscons/syscons.c		optional	sc
+dev/syscons/sysmouse.c		optional	sc
+isa/atkbd_isa.c			optional	atkbd
+
+libkern/ffs.c			standard
+kern/subr_diskmbr.c		standard
+
+x86_64/x86_64/autoconf.c	standard
+x86_64/x86_64/bios.c		standard
+x86_64/x86_64/bioscall.s	standard
+x86_64/x86_64/busdma_machdep.c	standard
+x86_64/x86_64/critical.c	standard
+x86_64/x86_64/db_disasm.c	optional	ddb
+x86_64/x86_64/db_interface.c	optional	ddb
+x86_64/x86_64/db_trace.c	optional	ddb
+x86_64/x86_64/dump_machdep.c	standard
+x86_64/x86_64/elf_machdep.c	standard
+x86_64/x86_64/exception.s	standard
+x86_64/x86_64/i686_mem.c	standard
+x86_64/x86_64/identcpu.c	standard
+x86_64/x86_64/initcpu.c		standard
+x86_64/x86_64/k6_mem.c		standard
+# locore.s needs to be handled in Makefile to put it first.  Otherwise it's
+# now normal.
+# x86_64/x86_64/locore.s	standard
+x86_64/x86_64/machdep.c		standard
+x86_64/x86_64/mem.c		standard
+x86_64/x86_64/nexus.c		standard
+x86_64/x86_64/pmap.c		standard
+x86_64/x86_64/support.s		standard
+x86_64/x86_64/swtch.s		standard
+x86_64/x86_64/sys_machdep.c	standard
+x86_64/x86_64/trap.c		standard
+x86_64/x86_64/vm86.c		standard
+x86_64/x86_64/vm_machdep.c	standard
+
+x86_64/isa/clock.c		standard
+x86_64/isa/intr_machdep.c	standard
+x86_64/isa/ithread.c		standard

sys/conf/options.amd64

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+# $FreeBSD$
+# Options specific to the AMD x86-64 platform kernels
+
+PANIC_REBOOT_WAIT_TIME	opt_panic.h
+MAXMEM
+PERFMON			opt_perfmon.h
+KSTACK_PAGES
+
+# Change KVM size.  Changes things all over the kernel.
+KVA_PAGES		opt_global.h
+
+CLK_CALIBRATION_LOOP	opt_clock.h
+TIMER_FREQ		opt_clock.h
+
+MAXCONS			opt_syscons.h
+SC_ALT_MOUSE_IMAGE	opt_syscons.h
+SC_CUT_SPACES2TABS	opt_syscons.h
+SC_CUT_SEPCHARS		opt_syscons.h
+SC_DEBUG_LEVEL		opt_syscons.h
+SC_DFLT_FONT		opt_syscons.h
+SC_DISABLE_DDBKEY	opt_syscons.h
+SC_DISABLE_REBOOT	opt_syscons.h
+SC_HISTORY_SIZE		opt_syscons.h
+SC_KERNEL_CONS_ATTR	opt_syscons.h
+SC_KERNEL_CONS_REV_ATTR	opt_syscons.h
+SC_MOUSE_CHAR		opt_syscons.h
+SC_NO_CUTPASTE		opt_syscons.h
+SC_NO_FONT_LOADING	opt_syscons.h
+SC_NO_HISTORY		opt_syscons.h
+SC_NO_SYSMOUSE		opt_syscons.h
+SC_NORM_ATTR		opt_syscons.h
+SC_NORM_REV_ATTR	opt_syscons.h
+SC_PIXEL_MODE		opt_syscons.h
+SC_RENDER_DEBUG		opt_syscons.h
+SC_TWOBUTTON_MOUSE	opt_syscons.h
+
+VGA_ALT_SEQACCESS	opt_vga.h
+VGA_DEBUG		opt_vga.h
+VGA_NO_FONT_LOADING	opt_vga.h
+VGA_NO_MODE_CHANGE	opt_vga.h
+VGA_SLOW_IOACCESS	opt_vga.h
+VGA_WIDTH90		opt_vga.h
+
+VESA			opt_vesa.h
+VESA_DEBUG		opt_vesa.h
+
+ATKBD_DFLT_KEYMAP	opt_atkbd.h
+
+KBD_DISABLE_KEYMAP_LOAD	opt_kbd.h
+KBD_INSTALL_CDEV	opt_kbd.h
+KBD_MAXRETRY		opt_kbd.h
+KBD_MAXWAIT		opt_kbd.h
+KBD_RESETDELAY		opt_kbd.h
+KBDIO_DEBUG		opt_kbd.h
+
+# -------------------------------
+# EOF
+# -------------------------------