[S390] Add four level page tables for CONFIG_64BIT=y.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 24 insertions, 5 deletions

diff --git a/include/asm-s390/pgalloc.h b/include/asm-s390/pgalloc.h
index af4aee856df3..cc47dd65a499 100644
--- a/include/asm-s390/pgalloc.h
+++ b/include/asm-s390/pgalloc.h
@@ -73,11 +73,17 @@ static inline unsigned long pgd_entry_type(struct mm_struct *mm)
 
 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
 {
-        return _REGION3_ENTRY_EMPTY;
+        return _REGION2_ENTRY_EMPTY;
 }
 
-#define pud_alloc_one(mm,address)               ({ BUG(); ((pud_t *)2); })
-#define pud_free(mm, x)                         do { } while (0)
+static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+        unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
+        if (table)
+                crst_table_init(table, _REGION3_ENTRY_EMPTY);
+        return (pud_t *) table;
+}
+#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
 
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
 {
@@ -88,8 +94,21 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
 }
 #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
 
-#define pgd_populate(mm, pgd, pud)              BUG()
-#define pgd_populate_kernel(mm, pgd, pud)       BUG()
+static inline void pgd_populate_kernel(struct mm_struct *mm,
+                                       pgd_t *pgd, pud_t *pud)
+{
+        pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
+}
+
+static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
+{
+        pgd_t *shadow_pgd = get_shadow_table(pgd);
+        pud_t *shadow_pud = get_shadow_table(pud);
+
+        if (shadow_pgd && shadow_pud)
+                pgd_populate_kernel(mm, shadow_pgd, shadow_pud);
+        pgd_populate_kernel(mm, pgd, pud);
+}
 
 static inline void pud_populate_kernel(struct mm_struct *mm,
                                        pud_t *pud, pmd_t *pmd)