[PATCH v5 08/19] ARM: LPAE: Use a mask for physical addresses in page table entries

[catalin.marinas@arm.com (Catalin Marinas)]

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@arm.com>
---
 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))