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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 David Craven <david@craven.ch>
+;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu bootloader extlinux)
+  #:use-module (gnu bootloader)
+  #:use-module (gnu system)
+  #:use-module (gnu packages bootloaders)
+  #:use-module (guix gexp)
+  #:use-module (guix monads)
+  #:use-module (guix records)
+  #:use-module (guix utils)
+  #:export (extlinux-bootloader))
+
+(define* (extlinux-configuration-file config entries
+                                      #:key
+                                      (system (%current-system))
+                                      (old-entries '()))
+  "Return the U-Boot configuration file corresponding to CONFIG, a
+<u-boot-configuration> object, and where the store is available at STORE-FS, a
+<file-system> object.  OLD-ENTRIES is taken to be a list of menu entries
+corresponding to old generations of the system."
+
+  (define all-entries
+    (append entries (bootloader-configuration-menu-entries config)))
+
+  (define (boot-parameters->gexp params)
+    (let ((label (boot-parameters-label params))
+          (kernel (boot-parameters-kernel params))
+          (kernel-arguments (boot-parameters-kernel-arguments params))
+          (initrd (boot-parameters-initrd params)))
+      #~(format port "LABEL ~a
+  MENU LABEL ~a
+  KERNEL ~a
+  FDTDIR ~a/lib/dtbs
+  INITRD ~a
+  APPEND ~a
+~%"
+                #$label #$label
+                #$kernel #$kernel #$initrd
+                (string-join (list #$@kernel-arguments)))))
+
+  (define builder
+    #~(call-with-output-file #$output
+        (lambda (port)
+          (let ((timeout #$(bootloader-configuration-timeout config)))
+            (format port "# This file was generated from your GuixSD configuration.  Any changes
+# will be lost upon reconfiguration.
+UI menu.c32
+PROMPT ~a
+TIMEOUT ~a~%"
+                    (if (> timeout 0) 1 0)
+                    ;; timeout is expressed in 1/10s of seconds.
+                    (* 10 timeout))
+            #$@(map boot-parameters->gexp all-entries)
+
+            #$@(if (pair? old-entries)
+                   #~((format port "~%")
+                      #$@(map boot-parameters->gexp old-entries)
+                      (format port "~%"))
+                   #~())))))
+
+  (gexp->derivation "extlinux.conf" builder))
+
+
+
+
+;;;
+;;; Install procedures.
+;;;
+
+(define dd
+  #~(lambda (bs count if of)
+      (zero? (system* "dd"
+                      (string-append "bs=" (number->string bs))
+                      (string-append "count=" (number->string count))
+                      (string-append "if=" if)
+                      (string-append "of=" of)))))
+
+(define install-extlinux
+  #~(lambda (bootloader device mount-point)
+      (let ((extlinux (string-append bootloader "/sbin/extlinux"))
+            (install-dir (string-append mount-point "/boot/extlinux"))
+            (syslinux-dir (string-append bootloader "/share/syslinux")))
+        (for-each (lambda (file)
+                    (install-file file install-dir))
+                  (find-files syslinux-dir "\\.c32$"))
+
+        (unless (and (zero? (system* extlinux "--install" install-dir))
+                     (#$dd 440 1 (string-append syslinux-dir "/mbr.bin") device))
+          (error "failed to install SYSLINUX")))))
+
+
+
+;;;
+;;; Bootloader definitions.
+;;;
+
+(define extlinux-bootloader
+  (bootloader
+   (name 'extlinux)
+   (package syslinux)
+   (installer install-extlinux)
+   (configuration-file "/boot/extlinux/extlinux.conf")
+   (configuration-file-generator extlinux-configuration-file)))