# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//build/compiled_action.gni")
import("//build/config/clang/clang.gni")
import("//build/config/fuchsia/zircon_images.gni")

declare_args() {
  # Use vboot images
  use_vboot = false

  # Put the "system image" package in the BOOTFS.  Hence what would
  # otherwise be /system/... at runtime is /boot/... instead.
  bootfs_only = false
}

# Build a "kernel partition" target for ChromeOS targets.
#
# Parameters
#
#   deps (required)
#     [list of one label] Must be a `zbi()` target defined earlier in the file.
#
#   output_name (optional, default: `target_name`)
#   output_extension (optional, default: `".vboot"`)
#     [string] Determines the file name, in `root_out_dir`.
#
template("vboot") {
  if (defined(invoker.output_name)) {
    output_file = invoker.output_name
  } else {
    output_file = target_name
  }
  if (defined(invoker.output_extension)) {
    if (invoker.output_extension != "") {
      output_file += ".${invoker.output_extension}"
    }
  } else {
    output_file += ".vboot"
  }
  output_file = "$root_out_dir/$output_file"

  compiled_action(target_name) {
    forward_variables_from(invoker,
                           [
                             "deps",
                             "metadata",
                             "testonly",
                             "visibility",
                           ])

    tool = "//garnet/tools/vboot_reference:futility"
    outputs = [
      output_file,
    ]

    vboot_dir = "//third_party/vboot_reference"
    kernel_keyblock = "$vboot_dir/tests/devkeys/kernel.keyblock"
    private_keyblock = "$vboot_dir/tests/devkeys/kernel_data_key.vbprivk"
    inputs = [
      kernel_keyblock,
      private_keyblock,
    ]

    assert(defined(deps), "vboot() requires deps")
    zbi = []
    foreach(label, deps) {
      zbi += get_target_outputs(label)
    }
    inputs += zbi
    assert(zbi == [ zbi[0] ], "vboot() requires exactly one zbi() in deps")

    # The CrOS bootloader supports Multiboot (with `--flags 0x2` below).
    # The Multiboot trampoline is the "kernel" (`--vmlinuz` switch) and the
    # ZBI is the RAM disk (`--bootloader` switch).
    assert(current_cpu == "x64")
    foreach(image, zircon_images) {
      if (image.name == "multiboot-kernel" && image.cpu == target_cpu) {
        kernel = "$zircon_root_build_dir/${image.path}"
      }
    }
    inputs += [ kernel ]

    args = [
      "vbutil_kernel",
      "--pack",
      rebase_path(output_file),
      "--keyblock",
      rebase_path(kernel_keyblock),
      "--signprivate",
      rebase_path(private_keyblock),
      "--bootloader",
      rebase_path(zbi[0]),
      "--vmlinuz",
      rebase_path(kernel),
      "--version",
      "1",
      "--flags",
      "0x2",
    ]
  }
}

# Build an "EFI System Partition" target for EFI targets.
#
# Parameters
#
#   deps (optional)
#     [list of labels] Targets that generate the other inputs.
#
#   output_name (optional, default: `target_name`)
#   output_extension (optional, default: `".esp.blk"`)
#     [string] Determines the file name, in `root_out_dir`.
#
#   bootdata_bin (optional)
#     [path] Must be a ramdisk that compliments zircon_bin.
#
#   zircon_bin (optional)
#     [path] A zircon kernel.
#
#   zedboot (optional)
#     [label] A Zedboot `zbi()` target.
#
#   cmdline (optional)
#     [path] A bootloader (Gigaboot) cmdline file to include in the EFI root.
#
template("esp") {
  if (defined(invoker.output_name)) {
    output_file = invoker.output_name
  } else {
    output_file = target_name
  }
  if (defined(invoker.output_extension)) {
    if (invoker.output_extension != "") {
      output_file += ".${invoker.output_extension}"
    }
  } else {
    output_file += ".esp.blk"
  }
  output_file = "$root_out_dir/$output_file"

  compiled_action(target_name) {
    forward_variables_from(invoker,
                           [
                             "deps",
                             "metadata",
                             "testonly",
                             "visibility",
                           ])

    tool = "//tools/make-efi"
    mkfs_msdosfs_bin = "$zircon_tools_dir/mkfs-msdosfs"

    outputs = [
      output_file,
    ]
    inputs = [
      mkfs_msdosfs_bin,
    ]
    args = [
      "--output",
      rebase_path(output_file),
      "--mkfs",
      rebase_path(mkfs_msdosfs_bin),
    ]

    if (defined(invoker.zircon_bin)) {
      args += [
        "--zircon",
        rebase_path(invoker.zircon_bin),
      ]
      inputs += [ invoker.zircon_bin ]
    }

    if (defined(invoker.bootdata_bin)) {
      args += [
        "--bootdata",
        rebase_path(invoker.bootdata_bin),
      ]
      inputs += [ invoker.bootdata_bin ]
    }

    if (defined(invoker.zedboot)) {
      args += [
        "--zedboot",
        rebase_path(invoker.zedboot),
      ]
      inputs += [ invoker.zedboot ]
    }

    if (defined(invoker.cmdline)) {
      args += [
        "--cmdline",
        rebase_path(invoker.cmdline),
      ]
    }

    if (target_cpu == "x64") {
      foreach(image, zircon_images) {
        if (image.name == "bootloader" && image.type == "efi" &&
            image.cpu == target_cpu) {
          gigaboot_bin = "$zircon_root_build_dir/${image.path}"
        }
      }
      args += [
        "--efi-bootloader",
        rebase_path(gigaboot_bin),
      ]
      inputs += [ gigaboot_bin ]
    }

    if (!defined(deps)) {
      deps = []
    }
    deps += [ "//zircon/public/tool/mkfs-msdosfs($host_toolchain)" ]
  }
}