add --enable-paravirt in cpukit configure scripts

cpukit/aclocal/enable-paravirt.m4

@@ -0,0 +1,17 @@
+AC_DEFUN([RTEMS_ENABLE_PARAVIRT],
+[
+
+AC_ARG_ENABLE(paravirt,
+[AS_HELP_STRING([--enable-paravirt],[enable support for paravirtualization 
+(i386 only) (default=no) ])],
+
+[case "${enableval}" in 
+  yes) case "${RTEMS_CPU}" in
+         i386)	    RTEMS_HAS_PARAVIRT=yes ;;
+         *)         RTEMS_HAS_PARAVIRT=no ;;
+       esac
+       ;;
+  no) RTEMS_HAS_PARAVIRT=no ;;
+  *)  AC_MSG_ERROR(bad value ${enableval} for enable-paravirt option) ;;
+esac],[RTEMS_HAS_PARAVIRT=no]) 
+])

cpukit/configure.ac

@@ -15,6 +15,7 @@ RTEMS_ENABLE_MULTIPROCESSING
 RTEMS_ENABLE_POSIX
 RTEMS_ENABLE_RTEMS_DEBUG
 RTEMS_ENABLE_NETWORKING
+RTEMS_ENABLE_PARAVIRT
 
 RTEMS_ENV_RTEMSCPU
 RTEMS_CHECK_RTEMS_DEBUG
@@ -182,6 +183,11 @@ RTEMS_CPUOPT([RTEMS_SMP],
   [1],
   [if SMP is enabled])
 
+RTEMS_CPUOPT([RTEMS_PARAVIRT],
+  [test x"$RTEMS_HAS_PARAVIRT" = xyes],
+  [1],
+  [PARAVIRT is enabled])
+
 RTEMS_CPUOPT([RTEMS_NETWORKING],
   [test x"$rtems_cv_HAS_NETWORKING" = xyes],
   [1],