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mmu_context.h

/*
 *  include/asm-s390/mmu_context.h
 *
 *  S390 version
 *
 *  Derived from "include/asm-i386/mmu_context.h"
 */

#ifndef __S390_MMU_CONTEXT_H
#define __S390_MMU_CONTEXT_H

#include <asm/pgalloc.h>
#include <asm/uaccess.h>
#include <asm-generic/mm_hooks.h>

static inline int init_new_context(struct task_struct *tsk,
                           struct mm_struct *mm)
{
      mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
#ifdef CONFIG_64BIT
      mm->context.asce_bits |= _ASCE_TYPE_REGION3;
#endif
      if (current->mm->context.pgstes) {
            mm->context.noexec = 0;
            mm->context.pgstes = 1;
      } else {
            mm->context.noexec = s390_noexec;
            mm->context.pgstes = 0;
      }
      mm->context.asce_limit = STACK_TOP_MAX;
      crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
      return 0;
}

#define destroy_context(mm)             do { } while (0)

#ifndef __s390x__
#define LCTL_OPCODE "lctl"
#else
#define LCTL_OPCODE "lctlg"
#endif

static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
{
      pgd_t *pgd = mm->pgd;

      S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
      if (switch_amode) {
            /* Load primary space page table origin. */
            pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
            S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
            asm volatile(LCTL_OPCODE" 1,1,%0\n"
                       : : "m" (S390_lowcore.user_exec_asce) );
      } else
            /* Load home space page table origin. */
            asm volatile(LCTL_OPCODE" 13,13,%0"
                       : : "m" (S390_lowcore.user_asce) );
      set_fs(current->thread.mm_segment);
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
                       struct task_struct *tsk)
{
      cpu_set(smp_processor_id(), next->cpu_vm_mask);
      update_mm(next, tsk);
}

#define enter_lazy_tlb(mm,tsk)      do { } while (0)
#define deactivate_mm(tsk,mm) do { } while (0)

static inline void activate_mm(struct mm_struct *prev,
                               struct mm_struct *next)
{
        switch_mm(prev, next, current);
}

#endif /* __S390_MMU_CONTEXT_H */

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