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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/s390/include/asm/pgalloc.h
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/s390/include/asm/pgalloc.h')
-rw-r--r--arch/s390/include/asm/pgalloc.h145
1 files changed, 145 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
new file mode 100644
index 00000000000..8eef9b5b3cf
--- /dev/null
+++ b/arch/s390/include/asm/pgalloc.h
@@ -0,0 +1,145 @@
+/*
+ * 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>
+
+unsigned long *crst_table_alloc(struct mm_struct *);
+void crst_table_free(struct mm_struct *, unsigned long *);
+
+unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
+void page_table_free(struct mm_struct *, unsigned long *);
+#ifdef CONFIG_HAVE_RCU_TABLE_FREE
+void page_table_free_rcu(struct mmu_gather *, unsigned long *);
+void __tlb_remove_table(void *_table);
+#endif
+
+static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
+{
+ typedef struct { char _[n]; } addrtype;
+
+ *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), "=m" (*(addrtype *) s)
+ : "m" (*(addrtype *) s));
+}
+
+static inline void crst_table_init(unsigned long *crst, unsigned long entry)
+{
+ 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 pud_populate(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);
+ 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);
+ 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(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
+{
+ pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
+}
+
+static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+{
+ pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
+}
+
+#endif /* __s390x__ */
+
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ spin_lock_init(&mm->context.list_lock);
+ INIT_LIST_HEAD(&mm->context.pgtable_list);
+ INIT_LIST_HEAD(&mm->context.gmap_list);
+ return (pgd_t *) crst_table_alloc(mm);
+}
+#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
+
+static inline void pmd_populate(struct mm_struct *mm,
+ pmd_t *pmd, pgtable_t pte)
+{
+ pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
+}
+
+#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, 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, vmaddr))
+#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
+
+#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)
+
+extern void rcu_table_freelist_finish(void);
+
+#endif /* _S390_PGALLOC_H */