linux-kernel - [PATCH] [4/8] Add pgtable accessor functions for GB pages

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Message-Id: <20080119064832.786F614EAD@wotan.suse.de>
Date:	Sat, 19 Jan 2008 07:48:32 +0100 (CET)
From:	Andi Kleen <ak@...e.de>
To:	mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [PATCH] [4/8] Add pgtable accessor functions for GB pages


Signed-off-by: Andi Kleen <ak@...e.de>

---
 include/asm-x86/pgtable_64.h |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux/include/asm-x86/pgtable_64.h
===================================================================
--- linux.orig/include/asm-x86/pgtable_64.h
+++ linux/include/asm-x86/pgtable_64.h
@@ -208,6 +208,12 @@ static inline unsigned long pmd_bad(pmd_
 #define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
 #define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
 
+static inline int pud_large(pud_t pte)
+{
+	return (pud_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) ==
+		(_PAGE_PSE|_PAGE_PRESENT);
+}
+
 /* PMD  - Level 2 access */
 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
 #define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
--
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