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[7/9] powerpc/mm/book3s-64: Shuffle read, write, execute and user bits in PTE

Message ID 1456108880-27464-8-git-send-email-paulus@ozlabs.org (mailing list archive)
State Accepted
Headers show

Commit Message

Paul Mackerras Feb. 22, 2016, 2:41 a.m. UTC 
From: Paul Mackerras <paulus@samba.org>

This moves the _PAGE_EXEC, _PAGE_RW and _PAGE_USER bits around in
the Linux PTE on 64-bit Book 3S systems to correspond with the bit
positions used in radix mode by PowerISA v3.0 CPUs.  This also adds
a _PAGE_READ bit corresponding to the read permission bit in the
radix PTE.  _PAGE_READ is currently unused but could possibly be used
in future to improve pte_protnone().

Signed-off-by: Paul Mackerras <paulus@samba.org>
---
 arch/powerpc/include/asm/book3s/64/hash.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
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Patch

diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index a59cfae..cd4bf95 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -13,9 +13,12 @@ 
  * We could create separate kernel read-only if we used the 3 PP bits
  * combinations that newer processors provide but we currently don't.
  */
-#define _PAGE_BIT_SWAP_TYPE	2
-#define _PAGE_USER		0x00004 /* page may be accessed by userspace */
-#define _PAGE_EXEC		0x00008 /* execute permission */
+#define _PAGE_BIT_SWAP_TYPE	0
+
+#define _PAGE_EXEC		0x00001 /* execute permission */
+#define _PAGE_RW		0x00002 /* read & write access allowed */
+#define _PAGE_READ		0x00004	/* read access allowed */
+#define _PAGE_USER		0x00008 /* page may be accessed by userspace */
 #define _PAGE_GUARDED		0x00010 /* G: guarded (side-effect) page */
 /* M (memory coherence) is always set in the HPTE, so we don't need it here */
 #define _PAGE_COHERENT		0x0
@@ -23,7 +26,6 @@ 
 #define _PAGE_WRITETHRU		0x00040 /* W: cache write-through */
 #define _PAGE_DIRTY		0x00080 /* C: page changed */
 #define _PAGE_ACCESSED		0x00100 /* R: page referenced */
-#define _PAGE_RW		0x00200 /* software: user write access allowed */
 #define _PAGE_BUSY		0x00800 /* software: PTE & hash are busy */
 #define _PAGE_SPECIAL		0x10000 /* software: special page */