### grub configuration for alyzon
#
# I run FreeBSD/amd64 with root-on-ZFS on a Lenovo ThinkCentre M83,
# which has UEFI.  At the moment, this configuration is basically
# unsupported (although it's coming soon), but I want to be able to
# use my system.  I've had prior experience with Lenovo UEFI boxes
# before (Arch on my ThinkPad T440), and I hate autogenerated GRUB
# configs, so I appropriated my hand-written GRUB config, and extended
# it.
#
# The main problem is the FreeBSD bootcode stack cannot boot a kernel 
# with GPT, ZFS, and UEFI, all at once.  Combinations are possible,
# but not the whole shebang.  GRUB, however, has a kFreeBSD mode (for
# booting GNU/kFreeBSD systems, presumably), which understands how to
# load modules, the zpool cache, and kernel environment flags.
#
# You probably won't need some of these knobs, notably the MSI/MSI-X 
# and TSO ones.  These are to work around a broken Marvell Yukon
# chipset, which only _sometimes_ will pass traffic in both directions.
# You'll also need to check the module list for modules you want; I have
# a caicos-class Radeon graphics card, which I want to do KMS on. 
# 
# It should be noted you will probably need to recompile your kernel
# to support the EFI vt(4) console correctly.  Otherwise, you'll get a 
# blank screen until you (e.g.) start X.  This stumped me.
#
# This requires GRUB from Git built with libZFS.
#
#     -- Jashank Jeremy <jashank@rulingia.com>

insmod part_gpt
insmod part_msdos
insmod fat
insmod zfs
insmod zfsinfo

if [ -s $prefix/grubenv ]; then
  load_env
fi

if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

#insmod efi_gop
#insmod efi_uga
#loadfont ascii

#set gfxmode="1920x1080x32;auto"
#set gfxpayload=keep
#insmod gfxterm
#insmod gfxmenu
#insmod png
#terminal_output gfxterm

if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
else
  set timeout=5
fi

set esp_uuid=XXXX-XXXX
search --no-floppy --fs-uuid --set=esp $esp_uuid

set root="hd0,gpt7"
set be="default"
set s=(hd0,gpt7)/ROOT/${be}/@
set kern="kernel"
set kopts=""

menuentry "[alyzon] FreeBSD" --class freebsd --class os {
    echo ":: loading ${kern} (options: ${kopts})..."
    set p="${s}/boot/${kern}/kernel"
    kfreebsd ${p} ${kopts}

    kfreebsd_loadenv ${s}/boot/device.hints

    echo ":: loading zpool.cache..."
    kfreebsd_module ${s}/boot/zfs/zpool.cache type=/boot/zfs/zpool.cache

    for kld in opensolaris zfs iicbus iic iicbb radeonkmsfw_CAICOS_pfp radeonkmsfw_CAICOS_me radeonkmsfw_BTC_rlc radeonkmsfw_CAICOS_mc drm2 radeonkms ; do echo ":: loading ${kld}..."; kfreebsd_module_elf ${s}/boot/${kern}/${kld}.ko; done

    set kFreeBSD.console="efi,vidconsole"
    set kFreeBSD.kern.vty="vt"
    set kFreeBSD.vfs.root.mountfrom="zfs:alyzon/ROOT/${be}"
    set kFreeBSD.vfs.zfs.arc_max="4294967296"
    set kFreeBSD.hw.pci.enable_msi="0"
    set kFreeBSD.hw.pci.enable_msix="0"
    set kFreeBSD.net.inet.tcp.tso=0
    echo ":: booting."
    echo ""

    echo "--------------------------------------------------------------------"
    echo " Due to the vagaries of graphics on this system, we may not be able"
    echo "  to display kernel probe data or boot progress.  Please stand by."
    echo "--------------------------------------------------------------------"
}

submenu "[alyzon] FreeBSD options..." {
    submenu "kernel" {
        menuentry "kernel" { set kern="kernel" }
        menuentry "kernel.old" { set kern="kernel.old" }
        menuentry "GENERIC" { set kern="GENERIC" }
    }

    submenu "boot environment" {
        menuentry "default" { set be="default" }
    }

    submenu "kernel options (currently '${kopts}')" {
        menuentry "single-user" { set kopts="${kopts} -s" }
        menuentry "verbose" { set kopts="${kopts} -v" }
    }
}