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x86: generate EFI platform bootable images

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Add EFI platform bootable images for x86 platforms. These images can
also boot from legacy BIOS platform.

EFI System Partition need to be fat12/fat16/fat32 (not need to load
filesystem drivers), so the first partition of EFI images are not ext4
filesystem any more.

GPT partition table has an alternate partition table, we did not
generate it. This may cause problems when use these images as qemu disk
(kernel can not find rootfs), we pad enough sectors will be ok.

Signed-off-by: 李国 <uxgood.org@gmail.com>
[part_magic_* refactoring, removed genisoimage checks]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
李国
2020-03-26 14:05:33 +08:00
committed by Petr Štetiar
parent d9228514cc
commit a6b7c3e672
12 changed files with 165 additions and 38 deletions
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62
package/base-files/files/lib/upgrade/common.sh
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@@ -102,6 +102,24 @@ get_magic_long() {
(get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
}
get_magic_gpt() {
(get_image "$@" | dd bs=8 count=1 skip=64) 2>/dev/null
}
get_magic_vfat() {
(get_image "$@" | dd bs=1 count=3 skip=54) 2>/dev/null
}
part_magic_efi() {
local magic=$(get_magic_gpt "$@")
[ "$magic" = "EFI PART" ]
}
part_magic_fat() {
local magic=$(get_magic_vfat "$@")
[ "$magic" = "FAT" ]
}
export_bootdevice() {
local cmdline bootdisk rootpart uuid blockdev uevent line class
local MAJOR MINOR DEVNAME DEVTYPE
@@ -136,6 +154,17 @@ export_bootdevice() {
fi
done
;;
PARTUUID=????????-????-????-????-??????????02)
uuid="${rootpart#PARTUUID=}"
uuid="${uuid%02}00"
for disk in $(find /dev -type b); do
set -- $(dd if=$disk bs=1 skip=568 count=16 2>/dev/null | hexdump -v -e '8/1 "%02x "" "2/1 "%02x""-"6/1 "%02x"')
if [ "$4$3$2$1-$6$5-$8$7-$9" = "$uuid" ]; then
uevent="/sys/class/block/${disk##*/}/uevent"
break
fi
done
;;
/dev/*)
uevent="/sys/class/block/${rootpart##*/}/../uevent"
;;
@@ -207,17 +236,34 @@ get_partitions() { # <device> <filename>
rm -f "/tmp/partmap.$filename"
local part
for part in 1 2 3 4; do
set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
part_magic_efi "$disk" && {
#export_partdevice will fail when partition number is greater than 15, as
#the partition major device number is not equal to the disk major device number
for part in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
set -- $(hexdump -v -n 48 -s "$((0x380 + $part * 0x80))" -e '4/4 "%08x"" "4/4 "%08x"" "4/4 "0x%08X "' "$disk")
local type="$(( $(hex_le32_to_cpu $1) % 256))"
local lba="$(( $(hex_le32_to_cpu $2) ))"
local num="$(( $(hex_le32_to_cpu $3) ))"
local type="$1"
local lba="$(( $(hex_le32_to_cpu $4) * 0x100000000 + $(hex_le32_to_cpu $3) ))"
local end="$(( $(hex_le32_to_cpu $6) * 0x100000000 + $(hex_le32_to_cpu $5) ))"
local num="$(( $end - $lba ))"
[ $type -gt 0 ] || continue
[ "$type" = "00000000000000000000000000000000" ] && continue
printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
done
printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
done
} || {
for part in 1 2 3 4; do
set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
local type="$(( $(hex_le32_to_cpu $1) % 256))"
local lba="$(( $(hex_le32_to_cpu $2) ))"
local num="$(( $(hex_le32_to_cpu $3) ))"
[ $type -gt 0 ] || continue
printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
done
}
fi
}