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

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

6 files changed, 109 insertions, 45 deletions

diff --git a/include/asm-s390/elf.h b/include/asm-s390/elf.h
index 8181ca5b98f4..b760cd4de385 100644
--- a/include/asm-s390/elf.h
+++ b/include/asm-s390/elf.h
@@ -138,14 +138,7 @@ typedef s390_regs elf_gregset_t;
    use of this is to invoke "./ld.so someprog" to test out a new version of
    the loader.  We need to make sure that it is out of the way of the program
    that it will "exec", and that there is sufficient room for the brk.  */
-
-#ifndef __s390x__
-#define ELF_ET_DYN_BASE         ((TASK_SIZE & 0x80000000) \
-                                ? TASK_SIZE / 3 * 2 \
-                                : 2 * TASK_SIZE / 3)
-#else /* __s390x__ */
-#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
-#endif /* __s390x__ */
+#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 
 /* Wow, the "main" arch needs arch dependent functions too.. :) */
 
diff --git a/include/asm-s390/mmu_context.h b/include/asm-s390/mmu_context.h
index 3eaac5efc632..b3ea3e199921 100644
--- a/include/asm-s390/mmu_context.h
+++ b/include/asm-s390/mmu_context.h
@@ -18,7 +18,7 @@ static inline int init_new_context(struct task_struct *tsk,
 {
         mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
 #ifdef CONFIG_64BIT
-        mm->context.asce_bits |= _ASCE_TYPE_REGION3;
+        mm->context.asce_bits |= _ASCE_TYPE_REGION2;
 #endif
         mm->context.noexec = s390_noexec;
         return 0;
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)
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 4fc937711482..8f473a718111 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -63,15 +63,15 @@ extern char empty_zero_page[PAGE_SIZE];
 #else /* __s390x__ */
 # define PMD_SHIFT      20
 # define PUD_SHIFT      31
-# define PGDIR_SHIFT    31
+# define PGDIR_SHIFT    42
 #endif /* __s390x__ */
 
 #define PMD_SIZE        (1UL << PMD_SHIFT)
 #define PMD_MASK        (~(PMD_SIZE-1))
 #define PUD_SIZE        (1UL << PUD_SHIFT)
 #define PUD_MASK        (~(PUD_SIZE-1))
-#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
-#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
 
 /*
  * entries per page directory level: the S390 is two-level, so
@@ -82,10 +82,11 @@ extern char empty_zero_page[PAGE_SIZE];
 #define PTRS_PER_PTE    256
 #ifndef __s390x__
 #define PTRS_PER_PMD    1
+#define PTRS_PER_PUD    1
 #else /* __s390x__ */
 #define PTRS_PER_PMD    2048
+#define PTRS_PER_PUD    2048
 #endif /* __s390x__ */
-#define PTRS_PER_PUD    1
 #define PTRS_PER_PGD    2048
 
 #define FIRST_USER_ADDRESS  0
@@ -418,9 +419,23 @@ static inline int pud_bad(pud_t pud)	 { return 0; }
 
 #else /* __s390x__ */
 
-static inline int pgd_present(pgd_t pgd) { return 1; }
-static inline int pgd_none(pgd_t pgd)    { return 0; }
-static inline int pgd_bad(pgd_t pgd)     { return 0; }
+static inline int pgd_present(pgd_t pgd)
+{
+        return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
+}
+
+static inline int pgd_none(pgd_t pgd)
+{
+        return (pgd_val(pgd) & _REGION_ENTRY_INV) != 0UL;
+}
+
+static inline int pgd_bad(pgd_t pgd)
+{
+        unsigned long mask =
+                ~_REGION_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
+                ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
+        return (pgd_val(pgd) & mask) != 0;
+}
 
 static inline int pud_present(pud_t pud)
 {
@@ -434,8 +449,10 @@ static inline int pud_none(pud_t pud)
 
 static inline int pud_bad(pud_t pud)
 {
-        unsigned long mask = ~_REGION_ENTRY_ORIGIN & ~_REGION_ENTRY_INV;
-        return (pud_val(pud) & mask) != _REGION3_ENTRY;
+        unsigned long mask =
+                ~_REGION_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
+                ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
+        return (pud_val(pud) & mask) != 0;
 }
 
 #endif /* __s390x__ */
@@ -516,7 +533,19 @@ static inline int pte_young(pte_t pte)
 
 #else /* __s390x__ */
 
-#define pgd_clear(pgd)          do { } while (0)
+static inline void pgd_clear_kernel(pgd_t * pgd)
+{
+        pgd_val(*pgd) = _REGION2_ENTRY_EMPTY;
+}
+
+static inline void pgd_clear(pgd_t * pgd)
+{
+        pgd_t *shadow = get_shadow_table(pgd);
+
+        pgd_clear_kernel(pgd);
+        if (shadow)
+                pgd_clear_kernel(shadow);
+}
 
 static inline void pud_clear_kernel(pud_t *pud)
 {
@@ -808,9 +837,13 @@ static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
 
 #define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
 #define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN)
-#define pgd_deref(pgd) ({ BUG(); 0UL; })
+#define pgd_deref(pgd) (pgd_val(pgd) & _REGION_ENTRY_ORIGIN)
 
-#define pud_offset(pgd, address) ((pud_t *) pgd)
+static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
+{
+        pud_t *pud = (pud_t *) pgd_deref(*pgd);
+        return pud  + pud_index(address);
+}
 
 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 {
diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index e8785634cbdb..5a21f457d583 100644
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -64,24 +64,28 @@ extern int get_cpu_capability(unsigned int *);
  */
 #ifndef __s390x__
 
-# define TASK_SIZE              (0x80000000UL)
-# define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
-# define DEFAULT_TASK_SIZE      (0x80000000UL)
+#define TASK_SIZE               (1UL << 31)
+#define TASK_UNMAPPED_BASE      (1UL << 30)
 
 #else /* __s390x__ */
 
-# define TASK_SIZE_OF(tsk)      (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
-                                        (0x80000000UL) : (0x40000000000UL))
-# define TASK_SIZE              TASK_SIZE_OF(current)
-# define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
-# define DEFAULT_TASK_SIZE      (0x40000000000UL)
+#define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk,TIF_31BIT) ? \
+                                        (1UL << 31) : (1UL << 53))
+#define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
+                                        (1UL << 30) : (1UL << 41))
+#define TASK_SIZE               TASK_SIZE_OF(current)
 
 #endif /* __s390x__ */
 
 #ifdef __KERNEL__
 
-#define STACK_TOP               TASK_SIZE
-#define STACK_TOP_MAX           DEFAULT_TASK_SIZE
+#ifndef __s390x__
+#define STACK_TOP               (1UL << 31)
+#else /* __s390x__ */
+#define STACK_TOP               (1UL << (test_thread_flag(TIF_31BIT) ? 31:53))
+#endif /* __s390x__ */
+
+#define STACK_TOP_MAX           STACK_TOP
 
 #endif
 
diff --git a/include/asm-s390/tlb.h b/include/asm-s390/tlb.h
index ecac75ec6cb0..9b2ddb7aac49 100644
--- a/include/asm-s390/tlb.h
+++ b/include/asm-s390/tlb.h
@@ -38,7 +38,7 @@ struct mmu_gather {
         struct mm_struct *mm;
         unsigned int fullmm;
         unsigned int nr_ptes;
-        unsigned int nr_pmds;
+        unsigned int nr_pxds;
         void *array[TLB_NR_PTRS];
 };
 
@@ -53,7 +53,7 @@ static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm,
         tlb->fullmm = full_mm_flush || (num_online_cpus() == 1) ||
                 (atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm);
         tlb->nr_ptes = 0;
-        tlb->nr_pmds = TLB_NR_PTRS;
+        tlb->nr_pxds = TLB_NR_PTRS;
         if (tlb->fullmm)
                 __tlb_flush_mm(mm);
         return tlb;
@@ -62,12 +62,13 @@ static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm,
 static inline void tlb_flush_mmu(struct mmu_gather *tlb,
                                  unsigned long start, unsigned long end)
 {
-        if (!tlb->fullmm && (tlb->nr_ptes > 0 || tlb->nr_pmds < TLB_NR_PTRS))
+        if (!tlb->fullmm && (tlb->nr_ptes > 0 || tlb->nr_pxds < TLB_NR_PTRS))
                 __tlb_flush_mm(tlb->mm);
         while (tlb->nr_ptes > 0)
                 pte_free(tlb->mm, tlb->array[--tlb->nr_ptes]);
-        while (tlb->nr_pmds < TLB_NR_PTRS)
-                pmd_free(tlb->mm, (pmd_t *) tlb->array[tlb->nr_pmds++]);
+        while (tlb->nr_pxds < TLB_NR_PTRS)
+                /* pgd_free frees the pointer as region or segment table */
+                pgd_free(tlb->mm, tlb->array[tlb->nr_pxds++]);
 }
 
 static inline void tlb_finish_mmu(struct mmu_gather *tlb,
@@ -99,7 +100,7 @@ static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte)
 {
         if (!tlb->fullmm) {
                 tlb->array[tlb->nr_ptes++] = pte;
-                if (tlb->nr_ptes >= tlb->nr_pmds)
+                if (tlb->nr_ptes >= tlb->nr_pxds)
                         tlb_flush_mmu(tlb, 0, 0);
         } else
                 pte_free(tlb->mm, pte);
@@ -113,15 +114,29 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
 {
 #ifdef __s390x__
         if (!tlb->fullmm) {
-                tlb->array[--tlb->nr_pmds] = (struct page *) pmd;
-                if (tlb->nr_ptes >= tlb->nr_pmds)
+                tlb->array[--tlb->nr_pxds] = pmd;
+                if (tlb->nr_ptes >= tlb->nr_pxds)
                         tlb_flush_mmu(tlb, 0, 0);
         } else
                 pmd_free(tlb->mm, pmd);
 #endif
 }
 
-#define pud_free_tlb(tlb, pud)                  do { } while (0)
+/*
+ * pud_free_tlb frees a pud table and clears the CRSTE for the
+ * region third table entry from the tlb.
+ */
+static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
+{
+#ifdef __s390x__
+        if (!tlb->fullmm) {
+                tlb->array[--tlb->nr_pxds] = pud;
+                if (tlb->nr_ptes >= tlb->nr_pxds)
+                        tlb_flush_mmu(tlb, 0, 0);
+        } else
+                pud_free(tlb->mm, pud);
+#endif
+}
 
 #define tlb_start_vma(tlb, vma)                 do { } while (0)
 #define tlb_end_vma(tlb, vma)                   do { } while (0)