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[build] Add support for including a UEFI shim in filesystem images

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Add support for loading iPXE via a UEFI shim in ISO and USB images.
Since the iPXE shim's default loader filename is currently "ipxe.efi"
for all CPU architectures, at most one architecture within an image
may use a shim.  (This limitation should be removed in the next signed
release of the iPXE shim.)

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2026-03-02 16:10:49 +00:00
parent 1fbc3bca70
commit 3680a4ae52
2 changed files with 73 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/util/genfsimg
+51 -11
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@@ -12,6 +12,7 @@ help() {
echo
echo "where OPTIONS are:"
echo " -h show this help"
echo " -e SHIM specify an EFI shim helper"
echo " -o FILE save image to file"
echo " -p PAD pad filesystem (in kB)"
echo " -s SCRIPT use executable script"
@@ -45,9 +46,9 @@ get_word() {
echo "${MSB}${LSB}"
}
# Get appropriate EFI boot filename for CPU architecture
# Get appropriate EFI boot filename portion for CPU architecture
#
efi_boot_name() {
efi_boot_arch() {
local FILENAME
local MZSIG
local PEOFF
@@ -70,25 +71,25 @@ efi_boot_name() {
ARCH=$(get_word "${FILENAME}" $(( 0x${PEOFF} + 4 )) )
case "${ARCH}" in
"014c" )
echo "BOOTIA32.EFI"
echo "IA32"
;;
"8664" )
echo "BOOTX64.EFI"
echo "X64"
;;
"01c2" )
echo "BOOTARM.EFI"
echo "ARM"
;;
"6264" )
echo "BOOTLOONGARCH64.EFI"
echo "LOONGARCH64"
;;
"aa64" )
echo "BOOTAA64.EFI"
echo "AA64"
;;
"5064" )
echo "BOOTRISCV64.EFI"
echo "RISCV64"
;;
"5032" )
echo "BOOTRISCV32.EFI"
echo "RISCV32"
;;
* )
echo "${FILENAME}: unrecognised EFI architecture ${ARCH}" >&2
@@ -134,12 +135,29 @@ copy_syslinux_file() {
OUTFILE=
PAD=0
SCRIPT=
while getopts "hlo:p:s:" OPTION ; do
SHIMAA64=
SHIMX64=
while getopts "he:o:p:s:" OPTION ; do
case "${OPTION}" in
h)
help
exit 0
;;
e)
SHIM="${OPTARG}"
SHIMARCH=$(efi_boot_arch "${SHIM}")
case "${SHIMARCH}" in
"AA64" )
SHIMAA64="${SHIM}"
;;
"X64" )
SHIMX64="${SHIM}"
;;
* )
echo "${SHIM}: unsupported shim architecture" >&2
exit 1
esac
;;
o)
OUTFILE="${OPTARG}"
;;
@@ -217,12 +235,34 @@ for FILENAME ; do
;;
*.efi)
DESTDIR="${FATDIR}/EFI/BOOT"
DESTFILE=$(efi_boot_name "${FILENAME}")
DESTARCH=$(efi_boot_arch "${FILENAME}")
case "${DESTARCH}" in
"AA64" )
DESTSHIM="${SHIMAA64}"
;;
"X64" )
DESTSHIM="${SHIMX64}"
;;
* )
DESTSHIM=
;;
esac
if [ -n "${DESTSHIM}" ] ; then
DESTFILE="IPXE.EFI"
else
DESTFILE="BOOT${DESTARCH}.EFI"
fi
if [ -z "${EFI}" ] ; then
mkdir -p "${DESTDIR}"
if [ -n "${SCRIPT}" ] ; then
cp "${SCRIPT}" "${FATDIR}/autoexec.ipxe"
fi
if [ -n "${SHIMAA64}" ] ; then
cp "${SHIMAA64}" "${DESTDIR}/BOOTAA64.EFI"
fi
if [ -n "${SHIMX64}" ] ; then
cp "${SHIMX64}" "${DESTDIR}/BOOTX64.EFI"
fi
fi
EFI=1
;;