ppc_newworld: configure screen size from QEMU command line options

Use the FW_CFG interface to send user requested screen size and depth to
OpenBIOS like 7f1aec5f93 for ppc_oldworld.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/ppc_newworld.c

@@ -360,6 +360,11 @@ static void ppc_core99_init (ram_addr_t ram_size,
     fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, initrd_base);
     fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, initrd_size);
     fw_cfg_add_i16(fw_cfg, FW_CFG_BOOT_DEVICE, ppc_boot_device);
+
+    fw_cfg_add_i16(fw_cfg, FW_CFG_PPC_WIDTH, graphic_width);
+    fw_cfg_add_i16(fw_cfg, FW_CFG_PPC_HEIGHT, graphic_height);
+    fw_cfg_add_i16(fw_cfg, FW_CFG_PPC_DEPTH, graphic_depth);
+
     qemu_register_boot_set(fw_cfg_boot_set, fw_cfg);
 }