[PATCH] pte_special()/pte_mkspecial() support added.

[PATCH] pte_special()/pte_mkspecial() support added.

[Dmitry Korotin]

    pte_special()/pte_mkspecial() support added.

Signed-off-by: Dmitry Korotin <dkorotin@wavecomp.com>
---
 arch/mips/Kconfig                    |    1 +
 arch/mips/include/asm/pgtable-bits.h |    5 +++++
 arch/mips/include/asm/pgtable.h      |   13 +++++++++++--
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 70d3200..0a46995 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -80,6 +80,7 @@ config MIPS
 	select RTC_LIB
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS
+	select ARCH_HAS_PTE_SPECIAL
 
 menu "Machine selection"
 
diff --git a/arch/mips/include/asm/pgtable-bits.h b/arch/mips/include/asm/pgtable-bits.h
index f88a48c..e0158af 100644
--- a/arch/mips/include/asm/pgtable-bits.h
+++ b/arch/mips/include/asm/pgtable-bits.h
@@ -52,6 +52,7 @@ enum pgtable_bits {
 	_PAGE_WRITE_SHIFT,
 	_PAGE_ACCESSED_SHIFT,
 	_PAGE_MODIFIED_SHIFT,
+	_PAGE_SPECIAL_SHIFT,
 };
 
 /*
@@ -78,6 +79,7 @@ enum pgtable_bits {
 	_PAGE_WRITE_SHIFT,
 	_PAGE_ACCESSED_SHIFT,
 	_PAGE_MODIFIED_SHIFT,
+	_PAGE_SPECIAL_SHIFT,
 };
 
 #elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
@@ -90,6 +92,7 @@ enum pgtable_bits {
 	_PAGE_WRITE_SHIFT,
 	_PAGE_ACCESSED_SHIFT,
 	_PAGE_MODIFIED_SHIFT,
+	_PAGE_SPECIAL_SHIFT,
 
 	/* Used by TLB hardware (placed in EntryLo) */
 	_PAGE_GLOBAL_SHIFT = 8,
@@ -113,6 +116,7 @@ enum pgtable_bits {
 #if defined(CONFIG_64BIT) && defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
 	_PAGE_HUGE_SHIFT,
 #endif
+	_PAGE_SPECIAL_SHIFT,
 
 	/* Used by TLB hardware (placed in EntryLo*) */
 #if defined(CONFIG_CPU_HAS_RIXI)
@@ -135,6 +139,7 @@ enum pgtable_bits {
 #if defined(CONFIG_64BIT) && defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
 # define _PAGE_HUGE		(1 << _PAGE_HUGE_SHIFT)
 #endif
+#define _PAGE_SPECIAL		(1 << _PAGE_SPECIAL_SHIFT)
 
 /* Used by TLB hardware (placed in EntryLo*) */
 #if defined(CONFIG_XPA)
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 4ccb465..ab66844 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -393,8 +393,17 @@ static inline pte_t pte_mkhuge(pte_t pte)
 }
 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
 #endif
-static inline int pte_special(pte_t pte)	{ return 0; }
-static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
+
+static inline int pte_special(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SPECIAL;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_SPECIAL;
+	return pte;
+}
 
 /*
  * Macro to make mark a page protection value as "uncacheable".	 Note
-- 
1.7.1

Re: [PATCH] pte_special()/pte_mkspecial() support added.

[Paul Burton]

Hello,

Dmitry Korotin wrote:
> pte_special()/pte_mkspecial() support added.
> 
> Signed-off-by: Dmitry Korotin <dkorotin@wavecomp.com>

Applied to mips-next.

Thanks,
    Paul

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