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| author | Dave Kleikamp <shaggy@linux.vnet.ibm.com> | 2008-07-08 00:28:54 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-09 16:30:45 +1000 |
| commit | ef3d3246a0d06be622867d21af25f997aeeb105f (patch) | |
| tree | 9f0ae1913e0e637ec3aa104cc5e81557e5661b3c /include/asm-powerpc/pasemi_dma.h | |
| parent | 379070491e1e744a59e69e5bcf3765012d15ecb4 (diff) | |
powerpc/mm: Add Strong Access Ordering support
Allow an application to enable Strong Access Ordering on specific pages of
memory on Power 7 hardware. Currently, power has a weaker memory model than
x86. Implementing a stronger memory model allows an emulator to more
efficiently translate x86 code into power code, resulting in faster code
execution.
On Power 7 hardware, storing 0b1110 in the WIMG bits of the hpte enables
strong access ordering mode for the memory page. This patchset allows a
user to specify which pages are thus enabled by passing a new protection
bit through mmap() and mprotect(). I have defined PROT_SAO to be 0x10.
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include/asm-powerpc/pasemi_dma.h')
0 files changed, 0 insertions, 0 deletions