Introduce io386 to heads and use it to finalize chipset at runtime

On some newer platforms of intel (confirmed on nehalem, sandy/ivy
bridge), coreboot after commit [2ac149d294af795710eb4bb20f093e9920604abd](https://review.coreboot.org/cgit/coreboot.git/commit/?id=2ac149d294af795710eb4bb20f093e9920604abd)
registers an SMI to lockdown some registers on the chipset, as well
as access to the SPI flash, optionally. The SMI will always be triggered
by coreboot during S3 resume, but can be triggered by either coreboot
or the payload during normal boot path.

Enabling lockdown access to SPI flash will effectly write-protect it,
but there is no runtime option for coreboot to control it, so letting
coreboot to trigger such SMI will leave the owner of the machine lost
any possibility to program the SPI flash with its own OS, and becomes
a nightmare if the machine is uneasy to disassemble, so a scheme could
be implement, in which the SMI to lockdown chipset and SPI flash is left
for a payload to trigger, and temporarily disabling such triggering in
order to program the SPI flash needs authentication.

I have implemented a passcode-protected runtime-disableable lockdown
with grub, described [here](https://github.com/hardenedlinux/Debian-GNU-Linux-Profiles/blob/master/docs/hardened_boot/grub-for-coreboot.md#update-for-coreboot-after-commit-2ac149d294af795710eb4bb20f093e9920604abd). In order to implement a similar scheme for
Heads, I wrote [io386](https://github.com/hardenedlinux/io386).

With this commit, io386 will be called before entering boot routine
to trigger the SMI to finalize the chipset and write protect the SPI
flash at the same time. Entering recovery shell will leave the flash
writable.

(The authentication routine implemented in previous revisions has been
split as an independent commit.)

Makefile

@@ -328,6 +328,7 @@ bin_modules-$(CONFIG_LVM2) += lvm2
 bin_modules-$(CONFIG_DROPBEAR) += dropbear
 bin_modules-$(CONFIG_FLASHTOOLS) += flashtools
 bin_modules-$(CONFIG_NEWT) += newt
+bin_modules-$(CONFIG_IO386) += io386
 
 $(foreach m, $(bin_modules-y), \
 	$(call map,initrd_bin_add,$(call bins,$m)) \

initrd/bin/generic-init

@@ -40,24 +40,35 @@ while true; do
 	fi
 
 	if [ "$totp_confirm" = "u" ]; then
+		if [ "$CONFIG_IO386" = y ]; then
+			lock_chip
+		fi
 		exec /bin/usb-init
 		continue
 	fi
 
 	if [ "$totp_confirm" = "m" ]; then
 		# Try to select a kernel from the menu
+		if [ "$CONFIG_IO386" = y ]; then
+			lock_chip
+		fi
 		mount_boot
 		kexec-select-boot -m -b /boot -c "grub.cfg"
 		continue
 	fi
 
 	if [ "$totp_confirm" = "y" -o -n "$totp_confirm" ]; then
 		# Try to boot the default
+		if [ "$CONFIG_IO386" = y ]; then
+			lock_chip
+		fi
 		mount_boot
 		kexec-select-boot -b /boot -c "grub.cfg" \
 		|| recovery "Failed default boot"
 	fi
 
+
+
 done
 
 recovery "Something failed during boot"

initrd/etc/functions

@@ -10,6 +10,13 @@ warn() {
 	echo >&2 "$*";
 }
 
+lock_chip() {
+	APM_CNT=0xb2
+	FIN_CODE=0xcb
+	echo "Finalizing chipset"
+	io386 -o b -b x $APM_CNT $FIN_CODE
+}
+
 recovery() {
 	echo >&2 "!!!!! $*"
 

modules/io386

@@ -0,0 +1,28 @@
+modules-$(CONFIG_IO386) += io386
+
+io386_depends := $(musl_dep)
+
+io386_version := git
+io386_repo := https://github.com/hardenedlinux/io386
+io386_dir := io386-$(io386_version)
+
+io386_target := \
+	$(MAKE_JOBS) \
+	$(CROSS_TOOLS) \
+	SHARED=yes \
+	PREFIX="/" \
+	&& \
+	$(MAKE) \
+	-C $(build)/$(io386_dir) \
+	$(CROSS_TOOLS) \
+	SHARED=yes \
+	PREFIX="/" \
+	DESTDIR="$(INSTALL)" \
+	install \
+
+io386_output := \
+	io386
+
+io386_libraries :=
+
+io386_configure :=