1 files changed, 174 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
new file mode 100644
index 000000000000..f5b2bf3d7c1d
--- /dev/null
+++ b/arch/s390/include/asm/pgalloc.h
@@ -0,0 +1,174 @@
+/*
+ *  include/asm-s390/pgalloc.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Hartmut Penner (hp@de.ibm.com)
+ *               Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  Derived from "include/asm-i386/pgalloc.h"
+ *    Copyright (C) 1994  Linus Torvalds
+ */
+
+#ifndef _S390_PGALLOC_H
+#define _S390_PGALLOC_H
+
+#include <linux/threads.h>
+#include <linux/gfp.h>
+#include <linux/mm.h>
+
+#define check_pgt_cache()	do {} while (0)
+
+unsigned long *crst_table_alloc(struct mm_struct *, int);
+void crst_table_free(struct mm_struct *, unsigned long *);
+
+unsigned long *page_table_alloc(struct mm_struct *);
+void page_table_free(struct mm_struct *, unsigned long *);
+void disable_noexec(struct mm_struct *, struct task_struct *);
+
+static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
+{
+	*s = val;
+	n = (n / 256) - 1;
+	asm volatile(
+#ifdef CONFIG_64BIT
+		"	mvc	8(248,%0),0(%0)\n"
+#else
+		"	mvc	4(252,%0),0(%0)\n"
+#endif
+		"0:	mvc	256(256,%0),0(%0)\n"
+		"	la	%0,256(%0)\n"
+		"	brct	%1,0b\n"
+		: "+a" (s), "+d" (n));
+}
+
+static inline void crst_table_init(unsigned long *crst, unsigned long entry)
+{
+	clear_table(crst, entry, sizeof(unsigned long)*2048);
+	crst = get_shadow_table(crst);
+	if (crst)
+		clear_table(crst, entry, sizeof(unsigned long)*2048);
+}
+
+#ifndef __s390x__
+
+static inline unsigned long pgd_entry_type(struct mm_struct *mm)
+{
+	return _SEGMENT_ENTRY_EMPTY;
+}
+
+#define pud_alloc_one(mm,address)		({ BUG(); ((pud_t *)2); })
+#define pud_free(mm, x)				do { } while (0)
+
+#define pmd_alloc_one(mm,address)		({ BUG(); ((pmd_t *)2); })
+#define pmd_free(mm, x)				do { } while (0)
+
+#define pgd_populate(mm, pgd, pud)		BUG()
+#define pgd_populate_kernel(mm, pgd, pud)	BUG()
+
+#define pud_populate(mm, pud, pmd)		BUG()
+#define pud_populate_kernel(mm, pud, pmd)	BUG()
+
+#else /* __s390x__ */
+
+static inline unsigned long pgd_entry_type(struct mm_struct *mm)
+{
+	if (mm->context.asce_limit <= (1UL << 31))
+		return _SEGMENT_ENTRY_EMPTY;
+	if (mm->context.asce_limit <= (1UL << 42))
+		return _REGION3_ENTRY_EMPTY;
+	return _REGION2_ENTRY_EMPTY;
+}
+
+int crst_table_upgrade(struct mm_struct *, unsigned long limit);
+void crst_table_downgrade(struct mm_struct *, unsigned long limit);
+
+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)
+{
+	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
+	if (table)
+		crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
+	return (pmd_t *) table;
+}
+#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
+
+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_populate_kernel(mm, pgd, pud);
+	if (mm->context.noexec) {
+		pgd = get_shadow_table(pgd);
+		pud = get_shadow_table(pud);
+		pgd_populate_kernel(mm, pgd, pud);
+	}
+}
+
+static inline void pud_populate_kernel(struct mm_struct *mm,
+				       pud_t *pud, pmd_t *pmd)
+{
+	pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
+}
+
+static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+{
+	pud_populate_kernel(mm, pud, pmd);
+	if (mm->context.noexec) {
+		pud = get_shadow_table(pud);
+		pmd = get_shadow_table(pmd);
+		pud_populate_kernel(mm, pud, pmd);
+	}
+}
+
+#endif /* __s390x__ */
+
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+	INIT_LIST_HEAD(&mm->context.crst_list);
+	INIT_LIST_HEAD(&mm->context.pgtable_list);
+	return (pgd_t *) crst_table_alloc(mm, s390_noexec);
+}
+#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
+
+static inline void pmd_populate_kernel(struct mm_struct *mm,
+				       pmd_t *pmd, pte_t *pte)
+{
+	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
+}
+
+static inline void pmd_populate(struct mm_struct *mm,
+				pmd_t *pmd, pgtable_t pte)
+{
+	pmd_populate_kernel(mm, pmd, pte);
+	if (mm->context.noexec) {
+		pmd = get_shadow_table(pmd);
+		pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
+	}
+}
+
+#define pmd_pgtable(pmd) \
+	(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
+
+/*
+ * page table entry allocation/free routines.
+ */
+#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
+#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
+
+#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
+#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
+
+#endif /* _S390_PGALLOC_H */