refactor: update initialisation to use new param check functions

quickemu

@@ -1812,33 +1812,17 @@ if [ -n "${VM}" ] && [ -e "${VM}" ]; then
                 usage;;
         esac
     fi
-
-    # Braille support requires SDL. Override $display if braille was requested.
-    if [ -n "${BRAILLE}" ]; then
-        display="sdl"
+else
+    echo "ERROR! Virtual machine configuration not found."
+    usage
 fi
 
 display_param_check
+ports_param_check
 sound_card_param_check
+tpm_param_check
 viewer_param_check
 
-    # Set the default 3D acceleration.
-    if [ -z "${gl}" ]; then
-        if command -v glxinfo &>/dev/null; then
-            GLSL_VER=$(glxinfo | grep "OpenGL ES GLSL" | awk '{print $NF}')
-            case ${GLSL_VER} in
-                1*|2*) gl="off";;
-                *) gl="on";;
-            esac
-        else
-            gl="on"
-        fi
-    fi
-
-    if [ -z "${PUBLIC}" ]; then
-        PUBLIC="${public_dir}"
-    fi
-
 if [ "${PUBLIC}" == "none" ]; then
     PUBLIC=""
 else
@@ -1860,16 +1844,6 @@ if [ -n "${VM}" ] && [ -e "${VM}" ]; then
     PUBLIC_PERMS=$(ls -ld "${PUBLIC}" | cut -d' ' -f1)
 fi
 
-    if [ -n "${ssh_port}" ] && ! is_numeric "${ssh_port}"; then
-        echo "ERROR: ssh_port must be a number!"
-        exit 1
-    fi
-
-    if [ -n "${spice_port}" ] && ! is_numeric "${spice_port}"; then
-        echo "ERROR: spice_port must be a number!"
-        exit 1
-    fi
-
 # Check if vm is already run
 VM_PID=""
 if [ -r "${VMDIR}/${VMNAME}.pid" ]; then
@@ -1881,18 +1855,6 @@ if [ -n "${VM}" ] && [ -e "${VM}" ]; then
     fi
 fi
 
-    if [ "${tpm}" == "on" ]; then
-        SWTPM=$(command -v swtpm)
-        if [ ! -e "${SWTPM}" ]; then
-            echo "ERROR! TPM is enabled, but swtpm was not found."
-            exit 1
-        fi
-    fi
-else
-    echo "ERROR! Virtual machine configuration not found."
-    usage
-fi
-
 if [ -z "${VM_PID}" ]; then
     #TODO: double quote the args array to prevent word splitting and this can be removed
     # Fix failing to start VM with spaces in the path