From: Paul Mackerras <paulus@ozlabs.org>
To: linuxppc-dev@ozlabs.org
Cc: Michael Ellerman <mpe@ellerman.id.au>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH 7/9] powerpc/mm/book3s-64: Shuffle read, write, execute and user bits in PTE
Date: Mon, 22 Feb 2016 13:41:18 +1100 [thread overview]
Message-ID: <1456108880-27464-8-git-send-email-paulus@ozlabs.org> (raw)
In-Reply-To: <1456108880-27464-1-git-send-email-paulus@ozlabs.org>
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(-)
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 */
--
2.6.4
next prev parent reply other threads:[~2016-02-22 2:41 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-22 2:41 [PATCH 0/9] powerpc/mm: Restructure Linux PTE on Book3S/64 to radix format Paul Mackerras
2016-02-22 2:41 ` [PATCH 1/9] powerpc/mm/book3s-64: Clean up some obsolete or misleading comments Paul Mackerras
2016-02-29 11:05 ` [1/9] " Michael Ellerman
2016-02-22 2:41 ` [PATCH 2/9] powerpc/mm/book3s-64: Free up 7 high-order bits in the Linux PTE Paul Mackerras
2016-02-22 2:41 ` [PATCH 3/9] powerpc/mm/book3s-64: Use physical addresses in upper page table tree levels Paul Mackerras
2016-02-22 4:55 ` Aneesh Kumar K.V
2016-02-23 1:16 ` Paul Mackerras
2016-02-22 7:06 ` Aneesh Kumar K.V
2016-02-23 1:19 ` Paul Mackerras
2016-02-23 2:36 ` [PATCH v2 " Paul Mackerras
2016-02-22 2:41 ` [PATCH 4/9] powerpc/mm/book3s-64: Move _PAGE_PRESENT to the most significant bit Paul Mackerras
2016-02-22 2:41 ` [PATCH 5/9] powerpc/mm/book3s-64: Move _PAGE_PTE to 2nd " Paul Mackerras
2016-02-22 2:41 ` [PATCH 6/9] powerpc/mm/book3s-64: Move HPTE-related bits in PTE to upper end Paul Mackerras
2016-02-22 2:41 ` Paul Mackerras [this message]
2016-02-22 2:41 ` [PATCH 8/9] powerpc/mm/book3s-64: Move software-used bits in PTE Paul Mackerras
2016-02-22 2:41 ` [PATCH 9/9] powerpc/mm/book3s-64: Expand the real page number field of the Linux PTE Paul Mackerras
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