x86: move pmd functions into common asm/pgalloc.h

Common definitions for 3-level pagetable functions.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 33 insertions, 0 deletions

diff --git a/include/asm-x86/pgalloc.h b/include/asm-x86/pgalloc.h
index 0d15e21eefec..ae23839db20b 100644
--- a/include/asm-x86/pgalloc.h
+++ b/include/asm-x86/pgalloc.h
@@ -40,6 +40,39 @@ static inline void pte_free(struct mm_struct *mm, struct page *pte)
 
 extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
 
+static inline void pmd_populate_kernel(struct mm_struct *mm,
+                                       pmd_t *pmd, pte_t *pte)
+{
+        paravirt_alloc_pt(mm, __pa(pte) >> PAGE_SHIFT);
+        set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
+}
+
+static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
+                                struct page *pte)
+{
+        unsigned long pfn = page_to_pfn(pte);
+
+        paravirt_alloc_pt(mm, pfn);
+        set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
+}
+
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+#if PAGETABLE_LEVELS > 2
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+        return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+}
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+        BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
+        free_page((unsigned long)pmd);
+}
+
+extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
+#endif  /* PAGETABLE_LEVELS > 2 */
+
 #ifdef CONFIG_X86_32
 # include "pgalloc_32.h"
 #else