ARM: mm: Transparent huge page support for LPAE systems.

[pandora-kernel.git] / arch / arm / include / asm / pgtable-3level.h

diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 9ab9b9e..feb3fb5 100644 (file)
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -88,6 +88,9 @@
 #define L_PTE_DIRTY            (_AT(pteval_t, 1) << 55)        /* unused */
 #define L_PTE_SPECIAL          (_AT(pteval_t, 1) << 56)        /* unused */
 
+#define PMD_SECT_DIRTY         (_AT(pmdval_t, 1) << 55)
+#define PMD_SECT_SPLITTING     (_AT(pmdval_t, 1) << 57)
+
 /*
  * To be used in assembly code with the upper page attributes.
  */
@@ -181,6 +184,54 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 #define pte_mkhuge(pte)                (__pte((pte_val(pte) & ~PMD_TYPE_MASK) | PMD_TYPE_SECT))
 
 
+#define pmd_present(pmd)       ((pmd_val(pmd) & PMD_TYPE_MASK) != PMD_TYPE_FAULT)
+#define pmd_young(pmd)         (pmd_val(pmd) & PMD_SECT_AF)
+
+#define __HAVE_ARCH_PMD_WRITE
+#define pmd_write(pmd)         (!(pmd_val(pmd) & PMD_SECT_RDONLY))
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmd_trans_huge(pmd)    ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT)
+#define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING)
+#endif
+
+#define PMD_BIT_FUNC(fn,op) \
+static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }
+
+PMD_BIT_FUNC(wrprotect,        |= PMD_SECT_RDONLY);
+PMD_BIT_FUNC(mkold,    &= ~PMD_SECT_AF);
+PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING);
+PMD_BIT_FUNC(mkwrite,   &= ~PMD_SECT_RDONLY);
+PMD_BIT_FUNC(mkdirty,   |= PMD_SECT_DIRTY);
+PMD_BIT_FUNC(mkyoung,   |= PMD_SECT_AF);
+PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK);
+
+#define pmd_mkhuge(pmd)                (__pmd((pmd_val(pmd) & ~PMD_TYPE_MASK) | PMD_TYPE_SECT))
+
+#define pmd_pfn(pmd)           (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
+#define pfn_pmd(pfn,prot)      (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
+#define mk_pmd(page,prot)      pfn_pmd(page_to_pfn(page),prot)
+
+static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
+{
+       const pmdval_t mask = PMD_SECT_USER | PMD_SECT_XN | PMD_SECT_RDONLY;
+       pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask);
+       return pmd;
+}
+
+static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
+                             pmd_t *pmdp, pmd_t pmd)
+{
+       BUG_ON(addr >= TASK_SIZE);
+       *pmdp = __pmd(pmd_val(pmd) | PMD_SECT_nG);
+       flush_pmd_entry(pmdp);
+}
+
+static inline int has_transparent_hugepage(void)
+{
+       return 1;
+}
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_PGTABLE_3LEVEL_H */