initial EFI support

EFI/UEFI is mostly about partitioning and bootloader setup,
at least from a distribution's point of view; so the
appropriate tools should be handy and firmware interface
module should not be exterminated from installer images
but get autoloaded instead.

Please note that while there exists 32-bit x86 EFI
we don't bother with it at the time being: it's relevant
to some irrelevant Xeon systems as well as for the older
Intel Macs (<2008) that are long out of fashion anyways.
That is, initially we deal with x86_64 EFI only.

features.in/efi/README

@@ -0,0 +1,6 @@
+Фича добавляет в образы необходимое для поддержки EFI/UEFI.
+
+См. тж.:
+* http://www.altlinux.org/UEFI
+* http://www.rodsbooks.com/efi-bootloaders/
+* https://bugzilla.altlinux.org/showdependencytree.cgi?id=27804

features.in/efi/config.mk

@@ -0,0 +1,7 @@
+use/efi:
+	@$(call add,THE_LISTS,$(call tags,base efi))
+	@$(call add,INSTALL2_PACKAGES,dosfstools)
+
+use/efi/debug: use/efi
+	@$(call add,STAGE2_PACKAGES,efibootmgr gdisk)
+	@$(call set,KFLAVOURS,led-ws)	### CONFIG_FB_EFI

features.in/efi/stage2/image-scripts.d/50-efi

@@ -0,0 +1,4 @@
+#!/bin/sh
+# see also https://bugzilla.altlinux.org/27970
+
+echo efivars >> /etc/modules

features.in/install2/install2/image-scripts.d/90+install2+cleanup+drivers

@@ -17,7 +17,7 @@ rm -rf /lib/modules/*/kernel/drivers/char/{ipmi,hw_random,mwave,tpm}
 rm -rf /lib/modules/*/kernel/drivers/char/watchdog
 rm -rf /lib/modules/*/kernel/drivers/cpufreq
 rm -rf /lib/modules/*/kernel/drivers/edac
-rm -rf /lib/modules/*/kernel/drivers/firmware	###
+#rm -rf /lib/modules/*/kernel/drivers/firmware	### EFI
 rm -rf /lib/modules/*/kernel/drivers/gpio
 rm -rf /lib/modules/*/kernel/drivers/hwmon
 rm -rf /lib/modules/*/kernel/drivers/infiniband	###

pkg.in/lists/tagged/base+efi

@@ -0,0 +1,7 @@
+gdisk
+parted
+dosfstools
+grub2-efi
+elilo
+efibootmgr
+installer-feature-efi-stage3