1. 28 10月, 2015 1 次提交
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      ARC: mm: HIGHMEM: kmap API implementation · 45890f6d
      Vineet Gupta 提交于
      Implement kmap* API for ARC.
      
      This enables
       - permanent kernel maps (pkmaps): :kmap() API
       - fixmap : kmap_atomic()
      
      We use a very simple/uniform approach for both (unlike some of the other
      arches). So fixmap doesn't use the customary compile time address stuff.
      The important semantic is sleep'ability (pkmap) vs. not (fixmap) which
      the API guarantees.
      
      Note that this patch only enables highmem for subsequent PAE40 support
      as there is no real highmem for ARC in pure 32-bit paradigm as explained
      below.
      
      ARC has 2:2 address split of the 32-bit address space with lower half
      being translated (virtual) while upper half unstranslated
      (0x8000_0000 to 0xFFFF_FFFF). kernel itself is linked at base of
      unstranslated space (i.e. 0x8000_0000 onwards), which is mapped to say
      DDR 0x0 by external Bus Glue logic (outside the core). So kernel can
      potentially access 1.75G worth of memory directly w/o need for highmem.
      (the top 256M is taken by uncached peripheral space from 0xF000_0000 to
      0xFFFF_FFFF)
      
      In PAE40, hardware can address memory beyond 4G (0x1_0000_0000) while
      the logical/virtual addresses remain 32-bits. Thus highmem is required
      for kernel proper to be able to access these pages for it's own purposes
      (user space is agnostic to this anyways).
      Signed-off-by: NAlexey Brodkin <abrodkin@synopsys.com>
      Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      45890f6d