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| author | Dave Kleikamp <shaggy@linux.vnet.ibm.com> | 2008-07-07 16:28:52 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-09 08:30:45 +0200 |
| commit | aba46c5027cb59d98052231b36efcbbde9c77a1d (patch) | |
| tree | b69dd362c74db562789d14136294c5fcbb7632e7 | |
| parent | mm: Allow architectures to define additional protection bits (diff) | |
| download | linux-aba46c5027cb59d98052231b36efcbbde9c77a1d.tar.xz linux-aba46c5027cb59d98052231b36efcbbde9c77a1d.zip | |
powerpc/mm: Define flags for Strong Access Ordering
This patch defines:
- PROT_SAO, which is passed into mmap() and mprotect() in the prot field
- VM_SAO in vma->vm_flags, and
- _PAGE_SAO, the combination of WIMG bits in the pte that enables strong
access ordering for the page.
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | include/asm-powerpc/mman.h | 2 | ||||
| -rw-r--r-- | include/asm-powerpc/pgtable-ppc64.h | 3 | ||||
| -rw-r--r-- | include/linux/mm.h | 1 |
3 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-powerpc/mman.h b/include/asm-powerpc/mman.h index 24cf664a8295..0c46bf2c7d5f 100644 --- a/include/asm-powerpc/mman.h +++ b/include/asm-powerpc/mman.h @@ -10,6 +10,8 @@ * 2 of the License, or (at your option) any later version. */ +#define PROT_SAO 0x10 /* Strong Access Ordering */ + #define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */ #define MAP_NORESERVE 0x40 /* don't reserve swap pages */ #define MAP_LOCKED 0x80 diff --git a/include/asm-powerpc/pgtable-ppc64.h b/include/asm-powerpc/pgtable-ppc64.h index b2754d46be44..d09599cccb35 100644 --- a/include/asm-powerpc/pgtable-ppc64.h +++ b/include/asm-powerpc/pgtable-ppc64.h @@ -93,6 +93,9 @@ #define _PAGE_RW 0x0200 /* software: user write access allowed */ #define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */ +/* Strong Access Ordering */ +#define _PAGE_SAO (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT) + #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT) #define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY) diff --git a/include/linux/mm.h b/include/linux/mm.h index 586a943cab01..689184446fc6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -108,6 +108,7 @@ extern unsigned int kobjsize(const void *objp); #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ +#define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */ #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |