[PATCH v6 07/18] ARM: LPAE: Use a mask for physical addresses in page table entries

From: Catalin Marinas
Date: Tue May 24 2011 - 17:42:56 EST


With LPAE, the physical address mask is 40-bit while the page table
entry is 64-bit. This patch introduces PHYS_MASK for the 2-level page
table format, defined as ~0UL.

Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
---
arch/arm/include/asm/pgtable-2level-hwdef.h | 2 ++
arch/arm/include/asm/pgtable.h | 6 +++---
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/pgtable-2level-hwdef.h b/arch/arm/include/asm/pgtable-2level-hwdef.h
index 2b52c40..5cfba15 100644
--- a/arch/arm/include/asm/pgtable-2level-hwdef.h
+++ b/arch/arm/include/asm/pgtable-2level-hwdef.h
@@ -88,4 +88,6 @@
#define PTE_SMALL_AP_URO_SRW (_AT(pteval_t, 0xaa) << 4)
#define PTE_SMALL_AP_URW_SRW (_AT(pteval_t, 0xff) << 4)

+#define PHYS_MASK (~0UL)
+
#endif
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 9618052..8f9e1dd 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -199,10 +199,10 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)

static inline pte_t *pmd_page_vaddr(pmd_t pmd)
{
- return __va(pmd_val(pmd) & PAGE_MASK);
+ return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
}

-#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd)))
+#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))

/* we don't need complex calculations here as the pmd is folded into the pgd */
#define pmd_addr_end(addr,end) (end)
@@ -223,7 +223,7 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd)
#define pte_offset_map(pmd,addr) (__pte_map(pmd) + pte_index(addr))
#define pte_unmap(pte) __pte_unmap(pte)

-#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
+#define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
#define pfn_pte(pfn,prot) __pte(__pfn_to_phys(pfn) | pgprot_val(prot))

#define pte_page(pte) pfn_to_page(pte_pfn(pte))

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