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pgalloc.h

/*
 *  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 */

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