New status file for Alpha emulation target.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3422 c046a42c-6fe2-441c-8c8c-71466251a162

target-alpha/STATUS

+(to be completed)
+
+Alpha emulation structure:
+cpu.h           : CPU definitions globally exported
+exec.h          : CPU definitions used only for translated code execution
+helper.c        : helpers that can be called either by the translated code
+                  or the Qemu core, including the exception handler.
+op.c            : Alpha dedicated micro-operations used by the code translator
+op_helper.c     : helpers that can be called only from micro-operations
+op_helper.h     : micro-operations helpers prototypes
+op_helper_mem.h : micro-operations templates
+                  for load and stores accesses helpers
+op_mem.h        : micro-operations templates for load and stores accesses
+op_template.h   : micro-operation templates for register moves
+translate.c     : Alpha instructions to micro-operations translator
+
+Code translator status:
+The Alpha CPU instruction emulation should be quite complete with the
+limitation that the VAX floating-point load and stores are not implemented.
+The 4 MMU modes are implemented.
+
+Linux user mode emulation status:
+a few programs start to run. Most crash at a certain point, dereferencing a
+NULL pointer. It seems that the UNIQUE register is not initialized properly.
+It may appear that old executables, not relying on TLS support, run but
+this is to be prooved...
+
+Full system emulation status:
+* Alpha PALCode emulation is in a very early stage and is not sufficient
+  to run any real OS. The alpha-softmmu target is not enabled for now.
+* no hardware platform description is implemented
+* there might be problems in the Alpha PALCode dedicated instructions
+  that would prevent to use a native PALCode image.