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Message-Id: <20100408.180010.76058269.davem@davemloft.net>
Date: Thu, 08 Apr 2010 18:00:10 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: a.p.zijlstra@...llo.nl
Cc: aarcange@...hat.com, avi@...hat.com, tglx@...utronix.de,
riel@...hat.com, mingo@...e.hu, akpm@...ux-foundation.org,
torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
linux-arch@...r.kernel.org, benh@...nel.crashing.org,
hugh.dickins@...cali.co.uk, mel@....ul.ie, npiggin@...e.de
Subject: [PATCH 3/4] sparc64: Add support for _PAGE_SPECIAL
Luckily there are still a few software PTE bits remaining
and they even match up in both the sun4u and sun4v pte
layouts.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
arch/sparc/include/asm/pgtable_64.h | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index f5b5fa7..b06c5a7 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -95,6 +95,10 @@
/* PTE bits which are the same in SUN4U and SUN4V format. */
#define _PAGE_VALID _AC(0x8000000000000000,UL) /* Valid TTE */
#define _PAGE_R _AC(0x8000000000000000,UL) /* Keep ref bit uptodate*/
+#define _PAGE_SPECIAL _AC(0x0200000000000000,UL) /* Special page */
+
+/* Advertise support for _PAGE_SPECIAL */
+#define __HAVE_ARCH_PTE_SPECIAL
/* SUN4U pte bits... */
#define _PAGE_SZ4MB_4U _AC(0x6000000000000000,UL) /* 4MB Page */
@@ -104,6 +108,7 @@
#define _PAGE_NFO_4U _AC(0x1000000000000000,UL) /* No Fault Only */
#define _PAGE_IE_4U _AC(0x0800000000000000,UL) /* Invert Endianness */
#define _PAGE_SOFT2_4U _AC(0x07FC000000000000,UL) /* Software bits, set 2 */
+#define _PAGE_SPECIAL_4U _AC(0x0200000000000000,UL) /* Special page */
#define _PAGE_RES1_4U _AC(0x0002000000000000,UL) /* Reserved */
#define _PAGE_SZ32MB_4U _AC(0x0001000000000000,UL) /* (Panther) 32MB page */
#define _PAGE_SZ256MB_4U _AC(0x2001000000000000,UL) /* (Panther) 256MB page */
@@ -133,6 +138,7 @@
#define _PAGE_ACCESSED_4V _AC(0x1000000000000000,UL) /* Accessed (ref'd) */
#define _PAGE_READ_4V _AC(0x0800000000000000,UL) /* Readable SW Bit */
#define _PAGE_WRITE_4V _AC(0x0400000000000000,UL) /* Writable SW Bit */
+#define _PAGE_SPECIAL_4V _AC(0x0200000000000000,UL) /* Special page */
#define _PAGE_PADDR_4V _AC(0x00FFFFFFFFFFE000,UL) /* paddr[55:13] */
#define _PAGE_IE_4V _AC(0x0000000000001000,UL) /* Invert Endianness */
#define _PAGE_E_4V _AC(0x0000000000000800,UL) /* side-Effect */
@@ -302,10 +308,10 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t prot)
: "=r" (mask), "=r" (tmp)
: "i" (_PAGE_PADDR_4U | _PAGE_MODIFIED_4U | _PAGE_ACCESSED_4U |
_PAGE_CP_4U | _PAGE_CV_4U | _PAGE_E_4U | _PAGE_PRESENT_4U |
- _PAGE_SZBITS_4U),
+ _PAGE_SZBITS_4U | _PAGE_SPECIAL),
"i" (_PAGE_PADDR_4V | _PAGE_MODIFIED_4V | _PAGE_ACCESSED_4V |
_PAGE_CP_4V | _PAGE_CV_4V | _PAGE_E_4V | _PAGE_PRESENT_4V |
- _PAGE_SZBITS_4V));
+ _PAGE_SZBITS_4V | _PAGE_SPECIAL));
return __pte((pte_val(pte) & mask) | (pgprot_val(prot) & ~mask));
}
@@ -502,6 +508,7 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkspecial(pte_t pte)
{
+ pte_val(pte) |= _PAGE_SPECIAL;
return pte;
}
@@ -607,9 +614,9 @@ static inline unsigned long pte_present(pte_t pte)
return val;
}
-static inline int pte_special(pte_t pte)
+static inline unsigned long pte_special(pte_t pte)
{
- return 0;
+ return pte_val(pte) & _PAGE_SPECIAL;
}
#define pmd_set(pmdp, ptep) \
--
1.6.6.1
--
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