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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>
+;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
+;;;
+;;; 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)
+  #:use-module (guix discovery)
+  #:use-module (guix records)
+  #:use-module (guix ui)
+  #:use-module (srfi srfi-1)
+  #:export (bootloader
+            bootloader?
+            bootloader-name
+            bootloader-package
+            bootloader-installer
+            bootloader-configuration-file
+            bootloader-configuration-file-generator
+
+            bootloader-configuration
+            bootloader-configuration?
+            bootloader-configuration-bootloader
+            bootloader-configuration-device
+            bootloader-configuration-menu-entries
+            bootloader-configuration-default-entry
+            bootloader-configuration-timeout
+            bootloader-configuration-theme
+            bootloader-configuration-terminal-outputs
+            bootloader-configuration-terminal-inputs
+            bootloader-configuration-serial-unit
+            bootloader-configuration-serial-speed
+            bootloader-configuration-additional-configuration
+
+            %bootloaders
+            lookup-bootloader-by-name))
+
+
+;;;
+;;; Bootloader record.
+;;;
+
+;; The <bootloader> record contains fields expressing how the bootloader
+;; should be installed. Every bootloader in gnu/bootloader/ directory
+;; has to be described by this record.
+
+(define-record-type* <bootloader>
+  bootloader make-bootloader
+  bootloader?
+  (name                            bootloader-name)
+  (package                         bootloader-package)
+  (installer                       bootloader-installer)
+  (configuration-file              bootloader-configuration-file)
+  (configuration-file-generator    bootloader-configuration-file-generator))
+
+
+;;;
+;;; Bootloader configuration record.
+;;;
+
+;; The <bootloader-configuration> record contains bootloader independant
+;; configuration used to fill bootloader configuration file.
+
+(define-record-type* <bootloader-configuration>
+  bootloader-configuration make-bootloader-configuration
+  bootloader-configuration?
+  (bootloader                      bootloader-configuration-bootloader)    ; <bootloader>
+  (device                          bootloader-configuration-device         ; string
+                                   (default #f))
+  (menu-entries                    bootloader-configuration-menu-entries   ; list of <boot-parameters>
+                                   (default '()))
+  (default-entry                   bootloader-configuration-default-entry  ; integer
+                                   (default 0))
+  (timeout                         bootloader-configuration-timeout        ; seconds as integer
+                                   (default 5))
+  (theme                           bootloader-configuration-theme          ; bootloader-specific theme
+                                   (default #f))
+  (terminal-outputs                bootloader-configuration-terminal-outputs ; list of symbols
+                                   (default '(gfxterm)))
+  (terminal-inputs                 bootloader-configuration-terminal-inputs  ; list of symbols
+                                   (default '()))
+  (serial-unit                     bootloader-configuration-serial-unit      ; integer | #f
+                                   (default #f))
+  (serial-speed                    bootloader-configuration-serial-speed     ; integer | #f
+                                   (default #f))
+  (additional-configuration        bootloader-configuration-additional-configuration ; record
+                                   (default #f)))
+
+
+;;;
+;;; Bootloaders.
+;;;
+
+(define (bootloader-modules)
+  "Return the list of bootloader modules."
+  (all-modules (map (lambda (entry)
+                      `(,entry . "gnu/bootloader"))
+                    %load-path)))
+
+(define %bootloaders
+  ;; The list of publically-known bootloaders.
+  (delay (fold-module-public-variables (lambda (obj result)
+                                         (if (bootloader? obj)
+                                             (cons obj result)
+                                             result))
+                                       '()
+                                       (bootloader-modules))))
+
+(define (lookup-bootloader-by-name name)
+  "Return the bootloader called NAME."
+  (or (find (lambda (bootloader)
+              (eq? name (bootloader-name bootloader)))
+            (force %bootloaders))
+      (leave (G_ "~a: no such bootloader~%") name)))