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

include/arch/i386/archtypes.h

@@ -39,7 +39,7 @@ struct fpu_state_s {
 	char fpu_image[527];
 };
 
-#define INMEMORY(p) (!p->p_seg.p_cr3 || ptproc == p)
+#define INMEMORY(p) (!p->p_seg.p_cr3 || get_cpulocal_var(ptproc) == p)
 
 #endif /* #ifndef _I386_TYPES_H */