SMP - Cpu local variables

- most global variables carry information which is specific to the
  local CPU and each CPU must have its own copy

- cpu local variable must be declared in cpulocal.h between
  DECLARE_CPULOCAL_START and DECLARE_CPULOCAL_END markers using
  DECLARE_CPULOCAL macro

- to access the cpu local data the provided macros must be used

	get_cpu_var(cpu, name)
	get_cpu_var_ptr(cpu, name)

	get_cpulocal_var(name)
	get_cpulocal_var_ptr(name)

- using this macros makes future changes in the implementation
  possible

- switching to ELF will make the declaration of cpu local data much
  simpler, e.g.

  CPULOCAL int blah;

  anywhere in the kernel source code

kernel/Makefile

@@ -7,7 +7,7 @@ PROG=	kernel
 SRCS=	mpx.S
 SRCS+=	start.c table.c main.c proc.c \
 	system.c clock.c utility.c debug.c profile.c interrupt.c \
-	watchdog.c
+	watchdog.c cpulocals.c
 
 DPADD+=	${LIBTIMERS} ${LIBSYS}
 LDADD+=	-ltimers -lsys