qemu: Split out common portions of make run rule

This will be useful later when we add targets for other architectures.

Signed-off-by: David Hendricks <david.hendricks@gmail.com>

Author: dhendrix

examples/qemu/Makefile

@@ -30,19 +30,15 @@ PATCHES_DIR := ./patches
 include $(OSF_BUILDER_DIR)/Makefile.inc
 OUT ?= build/$(PLATFORM)/osf-$(PLATFORM).rom
 
+# RNG to avoid DHCP lockups when waiting for entropy
+# redirect all the output to the console
+QEMU_COMMON_OPTS := -bios $(OUT) $(QEMU_KVM_OPTS) \
+	-m 1024 \
+	-object rng-random,filename=/dev/urandom,id=rng0 \
+	-nographic
+
 run:
-ifeq ($(ARCH), amd64)
-	sudo qemu-system-$(ARCH) \
-    `# the machine type specified in the coreboot mainboard configuration` \
-    -M q35 \
-    `# use KVM to avail of hardware virtualization extensions` \
-    -enable-kvm \
-    `# the coreboot ROM to run as system firmware` \
-    -bios $(OUT) \
-    `# the amount of RAM in MB` \
-    -m 1024 \
-    `# RNG to avoid DHCP lockups when waiting for entropy` \
-    -object rng-random,filename=/dev/urandom,id=rng0 \
-    `# redirect all the output to the console` \
-    -nographic
+ifeq ($(ARCH), x86_64)
+	$(QEMU_SYSTEM) $(QEMU_COMMON_OPTS) \
+	-M q35
 endif