Add qemu UEFI firmware support.

scripts/run_debug.sh

@@ -135,6 +135,23 @@ else
     debug_flags=""
 fi
 
+if [ $USE_LEGACY_BIOS ]; then
+    boot_flags=""
+else
+#   Check for the presence of the OVMF firmware.
+    if [ ! -f $build_dir/RELEASEX64_OVMF_CODE.fd ]; then
+        info "Downloading OVMF UEFI firmware for QEMU"
+        info "To disable this, set USE_LEGACY_BIOS=1."
+        pushd $build_dir
+        curl https://retrage.github.io/edk2-nightly/bin/RELEASEX64_OVMF_CODE.fd -LO || error "failed to download OVMF firmware for UEFI"
+        curl https://retrage.github.io/edk2-nightly/bin/RELEASEX64_OVMF_VARS.fd -LO || error "failed to download OVMF firmware for UEFI"
+        popd
+    fi
+
+    boot_flags="-drive if=pflash,format=raw,readonly=on,file=$build_dir/RELEASEX64_OVMF_CODE.fd \
+                -drive if=pflash,format=raw,file=$build_dir/RELEASEX64_OVMF_VARS.fd"
+fi
+
 # Set up test-specific flags
 if [ $is_test -eq 1 ]; then
     test_flags="-device isa-debug-exit,iobase=0xf4,iosize=0x04 -display none"
@@ -189,5 +206,6 @@ qemu-system-x86_64 -M q35 \
     -no-reboot \
     ${test_flags} \
     ${debug_flags} \
+    ${boot_flags} \
     ${QEMU_FLAGS:-}