1. 27 8月, 2009 1 次提交
    • T
      x86: Add x86_init infrastructure · 57844a8f
      Thomas Gleixner 提交于
      The upcoming Moorestown support brings the embedded world to x86. The
      setup code of x86 has already a couple of hooks which are either
      x86_quirks or paravirt ops. Some of those setup hooks are pretty
      convoluted like the timer setup and the tsc calibration code. But
      there are other places which could do with a cleanup.
      
      Instead of having inline functions/macros which are modified at
      compile time I decided to introduce x86_init ops which are
      unconditional in the code and make it clear that they can be changed
      either during compile time or in the early boot process. The function
      pointers are initialized by default functions which can be noops so
      that the pointer can be called unconditionally in the most cases. This
      also allows us to remove 32bit/64bit, paravirt and other #ifdeffery.
      
      paravirt guests are just a hardware platform in the setup code, so we
      should treat them as such and not hide all behind multiple layers of
      indirection and compile time dependencies.
      
      It's more obvious that x86_init.timers.timer_init() is a function
      pointer than the late_time_init = choose_time_init() obscurity. It's
      also way simpler to grep for x86_init.timers.timer_init and find all
      the places which modify that function pointer instead of analyzing
      weak functions, macros and paravirt indirections.
      
      Note. This is not a general paravirt_ops replacement. It just will
      move setup related hooks which are potentially useful for other
      platform setup purposes as well out of the paravirt domain.
      
      Add the base infrastructure without any functionality.
      Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      57844a8f