driver: Support booting via EFI on arm64 and x86_64

If the ovmf or qemu-efi-aarch64 packages are installed on Debian or
Ubuntu, use those files to boot up via EFI. This will help prevent
regressions like ClangBuiltLinux/linux#634.

This is disabled for kernel/common because the kernel does not shut down
cleanly; I don't think this is worth exploring because Android does not
care about EFI as far as I am aware.

I considered checking in the fd files so that other distributions could
take advantage of this but these files are over 50MB, which is too much
of a burden to force on everyone.

Presubmit: https://travis-ci.com/nathanchance/continuous-integration/builds/123450697

[skip ci]

Suggested-by: Kees Cook <[email protected]>
Signed-off-by: Nathan Chancellor <[email protected]>

.gitignore

@@ -1,3 +1,4 @@
+*.fd
 *.swp
 *.tar.gz
 .ccache

driver.sh

@@ -87,7 +87,13 @@ setup_variables() {
       qemu_cmdline=( -cpu cortex-a57
                      -drive "file=images/arm64/rootfs.ext4,format=raw,id=rootfs,if=none"
                      -device "virtio-blk-device,drive=rootfs"
-                     -append "console=ttyAMA0 root=/dev/vda" )
+                     -append "console=ttyAMA0 earlycon root=/dev/vda" )
+      aavmf=/usr/share/AAVMF
+      if [[ ${tree} != common && -f ${aavmf}/AAVMF_CODE.fd && -f ${aavmf}/AAVMF_VARS.fd ]]; then
+        cp ${aavmf}/AAVMF_VARS.fd images/arm64
+        qemu_cmdline+=( -drive "if=pflash,format=raw,readonly,file=${aavmf}/AAVMF_CODE.fd"
+                        -drive "if=pflash,format=raw,file=images/arm64/AAVMF_VARS.fd" )
+      fi
       export CROSS_COMPILE=aarch64-linux-gnu- ;;
 
     "mipsel")
@@ -148,6 +154,12 @@ setup_variables() {
           qemu_cmdline=( -drive "file=images/x86_64/rootfs.ext4,format=raw,if=virtio"
                          -append "console=ttyS0 root=/dev/vda" ) ;;
       esac
+      ovmf=/usr/share/OVMF
+      if [[ ${tree} != common && -f ${ovmf}/OVMF_CODE.fd && -f ${ovmf}/OVMF_VARS.fd ]]; then
+        cp ${ovmf}/OVMF_VARS.fd images/x86_64
+        qemu_cmdline+=( -drive "if=pflash,format=raw,readonly,file=${ovmf}/OVMF_CODE.fd"
+                        -drive "if=pflash,format=raw,file=images/x86_64/OVMF_VARS.fd" )
+      fi
       # Use KVM if the processor supports it (first part) and the KVM module is loaded (second part)
       [[ $(grep -c -E 'vmx|svm' /proc/cpuinfo) -gt 0 && $(lsmod 2>/dev/null | grep -c kvm) -gt 0 ]] && qemu_cmdline=( "${qemu_cmdline[@]}" -enable-kvm )
       image_name=bzImage