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authorDave Kleikamp <shaggy@linux.vnet.ibm.com>2008-07-08 00:28:52 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-09 16:30:45 +1000
commitaba46c5027cb59d98052231b36efcbbde9c77a1d (patch)
treeb69dd362c74db562789d14136294c5fcbb7632e7
parentb845f313d78e4e259ec449909e3bbadf77b53a6d (diff)
downloadblackbird-op-linux-aba46c5027cb59d98052231b36efcbbde9c77a1d.tar.gz
blackbird-op-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.h2
-rw-r--r--include/asm-powerpc/pgtable-ppc64.h3
-rw-r--r--include/linux/mm.h1
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
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