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cache-cp15.c

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  • Forked from Reform / reform-boundary-uboot
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    • Marek Vasut's avatar
      221a49d5
      ARM: Fix overflow in MMU setup · 221a49d5
      Marek Vasut authored
      
      The patch fixes a corner case where adding size to DRAM start resulted
      in a value (1 << 32), which in turn overflew the u32 computation, which
      resulted in 0 and it therefore prevented correct setup of the MMU tables.
      
      The addition of DRAM bank start and it's size can end up right at the end
      of the address space in the special case of a machine with enough memory.
      To prevent this overflow, shift the start and size separately and add them
      only after they were shifted.
      
      Hopefully, we only have systems in tree which have DRAM size aligned to
      1MiB boundary. If not, this patch would break such systems. On the other
      hand, such system would be broken by design anyway.
      
      Signed-off-by: default avatarMarek Vasut <marex@denx.de>
      Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
      221a49d5
      History
      ARM: Fix overflow in MMU setup
      Marek Vasut authored
      
      The patch fixes a corner case where adding size to DRAM start resulted
      in a value (1 << 32), which in turn overflew the u32 computation, which
      resulted in 0 and it therefore prevented correct setup of the MMU tables.
      
      The addition of DRAM bank start and it's size can end up right at the end
      of the address space in the special case of a machine with enough memory.
      To prevent this overflow, shift the start and size separately and add them
      only after they were shifted.
      
      Hopefully, we only have systems in tree which have DRAM size aligned to
      1MiB boundary. If not, this patch would break such systems. On the other
      hand, such system would be broken by design anyway.
      
      Signed-off-by: default avatarMarek Vasut <marex@denx.de>
      Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>