o  Reimplement map_pal_code to work with a global variable    ia64_pal_base instead of scanning the EFI tables. This way    AP startup code can more easily use the function. o  Initialize ia64_pal_base in ia64_init(). When the PAL code    doesn't need explicit mapping or no PAL code has been found,    ia64_pal_base will be 0. o  Remove some unused global variables. o  Also in ia64_init(), allocate only 1 page for struct pcpu    and remove some Alpha leftovers. o  Initialize pc_pcb in cpu_pcpu_init().
o  Reimplement map_pal_code to work with a global variable
   ia64_pal_base instead of scanning the EFI tables. This way
   AP startup code can more easily use the function.
o  Initialize ia64_pal_base in ia64_init(). When the PAL code
   doesn't need explicit mapping or no PAL code has been found,
   ia64_pal_base will be 0.
o  Remove some unused global variables.
o  Also in ia64_init(), allocate only 1 page for struct pcpu
   and remove some Alpha leftovers.
o  Initialize pc_pcb in cpu_pcpu_init().

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