first steps towards a QEMU target backend

- This commit only enables linking against QEMU.  The abstraction layer is
  completely dysfunctional at this time.
- QEMU's build system needs to be patched in order to create a static
  library.  This patch is currently not included in the Fail* repository.
- QEMU's JIT compilation may complicate or even preclude the implementation
  of some of Fail*'s backend abstractions.  Only a minimal subset (serial
  I/O, memory, memory writes, save/restore) is planned for the first phase.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1615 8c4709b5-6ec9-48aa-a5cd-a96041d1645a

src/core/sal/qemu/QEMUConfig.hpp

@@ -0,0 +1,20 @@
+/**
+ * \brief Type definitions and configuration settings for the
+ * qemu-system-x86_64 target backend.
+ */
+
+#ifndef __QEMU_CONFIG_HPP__
+  #define __QEMU_CONFIG_HPP__
+
+// FIXME: qemu/targphys.h defines address types (but relies on a global preprocessor macro)
+
+namespace fail {
+
+typedef uint64_t guest_address_t; //!< the guest memory address type
+typedef unsigned char* host_address_t;  //!< the host memory address type
+typedef uint64_t register_data_t; //!< register data type (64 bit)
+typedef int timer_t;         //!< type of timer IDs
+
+} // end-of-namespace: fail
+
+#endif // __QEMU_CONFIG_HPP__