powerpc/8xx: Update TLB asm so it behaves as linux mm expects.

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Update the TLB asm to make proper use of _PAGE_DIRY and _PAGE_ACCESSED.
Get rid of _PAGE_HWWRITE too.
Pros:
 - I/D TLB Miss never needs to write to the linux pte.
 - _PAGE_ACCESSED is only set on TLB Error fixing accounting
 - _PAGE_DIRTY is mapped to 0x100, the changed bit, and is set directly
    when a page has been made dirty.
 - Proper RO/RW mapping of user space.
 - Free up 2 SW TLB bits in the linux pte(add back _PAGE_WRITETHRU ?)
 - kernel RO/user NA support.
Cons:
 - A few more instructions in the TLB Miss routines.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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This commit is contained in:

Joakim Tjernlund 2009-11-20 00:21:03 +00:00 • committed by Benjamin Herrenschmidt

parent 5efab4a02c

commit fe11dc3f96

2 changed files with 57 additions and 55 deletions

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13

arch/powerpc/include/asm/pte-8xx.h

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99

arch/powerpc/kernel/head_8xx.S

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