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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Timothy Sample <samplet@ngyro.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 depthcharge)
#:use-module (gnu bootloader extlinux)
#:use-module (gnu bootloader)
#:use-module (gnu packages bootloaders)
#:use-module (guix gexp)
#:use-module (guix utils)
#:use-module (ice-9 match)
#:export (depthcharge-bootloader))
(define (signed-kernel kernel kernel-arguments initrd)
(define builder
(with-imported-modules '((guix build utils))
#~(begin
(use-modules (guix build utils)
(ice-9 binary-ports)
(rnrs bytevectors))
(set-path-environment-variable "PATH" '("bin") (list #$dtc))
;; TODO: These files have to be writable, so we copy them.
;; This can probably be fixed by using a ".its" file, just
;; be careful not to break initrd loading.
(copy-file #$kernel "zImage")
(chmod "zImage" #o755)
(copy-file (string-append (dirname #$kernel) "/lib/dtbs/"
"rk3288-veyron-speedy.dtb")
"rk3288-veyron-speedy.dtb")
(chmod "rk3288-veyron-speedy.dtb" #o644)
(copy-file #$initrd "initrd")
(chmod "initrd" #o644)
(invoke (string-append #$u-boot-tools "/bin/mkimage")
"-D" "-I dts -O dtb -p 2048"
"-f" "auto"
"-A" "arm"
"-O" "linux"
"-T" "kernel"
"-C" "None"
"-d" "zImage"
"-a" "0"
"-b" "rk3288-veyron-speedy.dtb"
"-i" "initrd"
"image.itb")
(call-with-output-file "bootloader.bin"
(lambda (port)
(put-bytevector port (make-bytevector 512 0))))
(with-output-to-file "kernel-arguments"
(lambda ()
(display (string-join (list #$@kernel-arguments)))))
(invoke (string-append #$vboot-utils "/bin/vbutil_kernel")
"--pack" #$output
"--version" "1"
"--vmlinuz" "image.itb"
"--arch" "arm"
"--keyblock" (string-append #$vboot-utils
"/share/vboot-utils/devkeys/"
"kernel.keyblock")
"--signprivate" (string-append #$vboot-utils
"/share/vboot-utils/devkeys/"
"kernel_data_key.vbprivk")
"--config" "kernel-arguments"
"--bootloader" "bootloader.bin"))))
(computed-file "vmlinux.kpart" builder))
(define* (depthcharge-configuration-file config entries
#:key
(system (%current-system))
(old-entries '())
#:allow-other-keys)
(match entries
((entry)
(let ((kernel (menu-entry-linux entry))
(kernel-arguments (menu-entry-linux-arguments entry))
(initrd (menu-entry-initrd entry)))
;; XXX: Make this a symlink.
(signed-kernel kernel kernel-arguments initrd)))
(_ (error "Too many bootloader menu entries!"))))
(define install-depthcharge
#~(lambda (bootloader device mount-point)
(let ((kpart (string-append mount-point
"/boot/depthcharge/vmlinux.kpart")))
(write-file-on-device kpart (stat:size (stat kpart)) device 0))))
(define depthcharge-bootloader
(bootloader
(name 'depthcharge)
(package #f)
(installer install-depthcharge)
(configuration-file "/boot/depthcharge/vmlinux.kpart")
(configuration-file-generator depthcharge-configuration-file)))
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