tool: Consolidate qemu nic setup.

Right now the same code dealing with nic setup on qemu is duplicated
in many different run scripts. It makes it unnecesarily complex to
change the existing config or add support for new nic types. Lets move
all this common code to qemu.inc.

Ref #3825

tool/run/log/qemu

@@ -3,7 +3,6 @@
 #
 
 source [genode_dir]/tool/run/log.inc
-source [genode_dir]/tool/run/qemu.inc
 
 
 proc run_log { wait_for_re timeout_value } {

tool/run/power_on/qemu

@@ -4,8 +4,6 @@
 # Reset the target machine or rather run the scenario with Qemu
 #
 
-source [genode_dir]/tool/run/qemu.inc
-
 proc check_version {qemu_version qemu_min qemu_max} {
 	set version_min_list [split $qemu_min ".-"]
 	set version_min_list_len [llength $version_min_list]

tool/run/qemu.inc

@@ -14,6 +14,24 @@ proc qemu_args { } {
 	return $qemu_args
 }
 
+proc qemu_nic_model {} {
+	if [have_spec lan9118]     { return lan9118 }
+	if [have_spec zynq]        { return cadence_gem }
+	if [have_spec x86]         { return e1000 }
+	return nic_model_missing
+}
+
+proc append_qemu_nic_args { { extra_netdev_args "" } } {
+	global qemu_args
+	append qemu_args " -netdev user,id=net0"
+
+	if { $extra_netdev_args ne "" } {
+		append qemu_args ",$extra_netdev_args"
+	}
+
+	append qemu_args " -net nic,model=[qemu_nic_model],netdev=net0 "
+}
+
 
 ##
 # Check whether Qemu support is available

tool/run/run

@@ -1026,6 +1026,7 @@ proc build_initrd { modules } {
 }
 
 source [genode_dir]/tool/run/depot.inc
+source [genode_dir]/tool/run/qemu.inc
 
 
 ##