[arch-releng] [RFC][PATCH][v2] [configs/releng] Add 32-bit EFI support

[Gerardo Exequiel Pozzi]

Support booting 64-bit Linux, from 32-bit EFI firmware.

Only tested on qemu with ovmf, does not work at all.
cdrom mode: qemu stop with bad instruction address
hybrid mode: qemu just freeze at tianocore logo with a upper pixed dot.

---
 configs/releng/build.sh                         | 24 ++++++++++++++++++++++++
 configs/releng/efiboot/syslinux/archiso-cd.cfg  |  7 +++++++
 configs/releng/efiboot/syslinux/archiso-usb.cfg |  7 +++++++
 configs/releng/efiboot/syslinux/syslinux.cfg    |  6 ++++++
 4 files changed, 44 insertions(+)
 create mode 100644 configs/releng/efiboot/syslinux/archiso-cd.cfg
 create mode 100644 configs/releng/efiboot/syslinux/archiso-usb.cfg
 create mode 100644 configs/releng/efiboot/syslinux/syslinux.cfg

diff --git a/configs/releng/build.sh b/configs/releng/build.sh
index 72b1e3f..17b929a 100755
--- a/configs/releng/build.sh
+++ b/configs/releng/build.sh
@@ -164,6 +164,18 @@ make_efi() {
     curl -o ${work_dir}/iso/EFI/shellx64_v2.efi https://raw.githubusercontent.com/tianocore/edk2/master/ShellBinPkg/UefiShell/X64/Shell.efi
     # EFI Shell 1.0 for non UEFI 2.3+
     curl -o ${work_dir}/iso/EFI/shellx64_v1.efi https://raw.githubusercontent.com/tianocore/edk2/master/EdkShellBinPkg/FullShell/X64/Shell_Full.efi
+
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/syslinux.efi ${work_dir}/iso/EFI/boot/bootia32.efi
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/ldlinux.e32 ${work_dir}/iso/EFI/boot/
+    cp ${script_path}/efiboot/syslinux/syslinux.cfg ${work_dir}/iso/EFI/boot/
+
+    mkdir ${work_dir}/iso/EFI/syslinux
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/libutil.c32 ${work_dir}/iso/EFI/syslinux/
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/menu.c32 ${work_dir}/iso/EFI/syslinux/
+
+    sed "s|%ARCHISO_LABEL%|${iso_label}|g;
+         s|%INSTALL_DIR%|${install_dir}|g" \
+        ${script_path}/efiboot/syslinux/archiso-usb.cfg > ${work_dir}/iso/EFI/syslinux/archiso.cfg
 }
 
 # Prepare efiboot.img::/EFI for "El Torito" EFI boot mode
@@ -199,6 +211,18 @@ make_efiboot() {
     cp ${work_dir}/iso/EFI/shellx64_v2.efi ${work_dir}/efiboot/EFI/
     cp ${work_dir}/iso/EFI/shellx64_v1.efi ${work_dir}/efiboot/EFI/
 
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/syslinux.efi ${work_dir}/efiboot/EFI/boot/bootia32.efi
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/ldlinux.e32 ${work_dir}/efiboot/EFI/boot/
+    cp ${script_path}/efiboot/syslinux/syslinux.cfg ${work_dir}/efiboot/EFI/boot/
+
+    mkdir ${work_dir}/efiboot/EFI/syslinux
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/libutil.c32 ${work_dir}/efiboot/EFI/syslinux/
+    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/efi32/menu.c32 ${work_dir}/efiboot/EFI/syslinux/
+
+    sed "s|%ARCHISO_LABEL%|${iso_label}|g;
+         s|%INSTALL_DIR%|${install_dir}|g" \
+        ${script_path}/efiboot/syslinux/archiso-cd.cfg > ${work_dir}/efiboot/EFI/syslinux/archiso.cfg
+
     umount -d ${work_dir}/efiboot
 }
 
diff --git a/configs/releng/efiboot/syslinux/archiso-cd.cfg b/configs/releng/efiboot/syslinux/archiso-cd.cfg
new file mode 100644
index 0000000..aebe289
--- /dev/null
+++ b/configs/releng/efiboot/syslinux/archiso-cd.cfg
@@ -0,0 +1,7 @@
+UI menu.c32
+
+LABEL arch64
+MENU LABEL Boot Arch Linux (x86_64)
+LINUX /EFI/archiso/vmlinuz
+INITRD /EFI/archiso/intel_ucode.img,/EFI/archiso/archiso.img
+APPEND archisobasedir=%INSTALL_DIR% archisolabel=%ARCHISO_LABEL%
diff --git a/configs/releng/efiboot/syslinux/archiso-usb.cfg b/configs/releng/efiboot/syslinux/archiso-usb.cfg
new file mode 100644
index 0000000..03df5ca
--- /dev/null
+++ b/configs/releng/efiboot/syslinux/archiso-usb.cfg
@@ -0,0 +1,7 @@
+UI menu.c32
+
+LABEL arch64
+MENU LABEL Boot Arch Linux (x86_64)
+LINUX /%INSTALL_DIR%/boot/x86_64/vmlinuz
+INITRD /%INSTALL_DIR%/boot/intel_ucode.img,/%INSTALL_DIR%/boot/x86_64/archiso.img
+APPEND archisobasedir=%INSTALL_DIR% archisolabel=%ARCHISO_LABEL%
diff --git a/configs/releng/efiboot/syslinux/syslinux.cfg b/configs/releng/efiboot/syslinux/syslinux.cfg
new file mode 100644
index 0000000..77b6407
--- /dev/null
+++ b/configs/releng/efiboot/syslinux/syslinux.cfg
@@ -0,0 +1,6 @@
+PATH /EFI/syslinux/
+DEFAULT loadconfig
+
+LABEL loadconfig
+  CONFIG /EFI/syslinux/archiso.cfg
+  APPEND /EFI/
-- 
2.12.0