linux/arch/um/include/asm/mmu_context.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* 
   3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   4 */
   5
   6#ifndef __UM_MMU_CONTEXT_H
   7#define __UM_MMU_CONTEXT_H
   8
   9#include <linux/sched.h>
  10#include <linux/mm_types.h>
  11
  12#include <asm/mmu.h>
  13
  14extern void uml_setup_stubs(struct mm_struct *mm);
  15/*
  16 * Needed since we do not use the asm-generic/mm_hooks.h:
  17 */
  18static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
  19{
  20        uml_setup_stubs(mm);
  21        return 0;
  22}
  23extern void arch_exit_mmap(struct mm_struct *mm);
  24static inline void arch_unmap(struct mm_struct *mm,
  25                        unsigned long start, unsigned long end)
  26{
  27}
  28static inline void arch_bprm_mm_init(struct mm_struct *mm,
  29                                     struct vm_area_struct *vma)
  30{
  31}
  32
  33static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
  34                bool write, bool execute, bool foreign)
  35{
  36        /* by default, allow everything */
  37        return true;
  38}
  39
  40/*
  41 * end asm-generic/mm_hooks.h functions
  42 */
  43
  44#define deactivate_mm(tsk,mm)   do { } while (0)
  45
  46extern void force_flush_all(void);
  47
  48static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
  49{
  50        /*
  51         * This is called by fs/exec.c and sys_unshare()
  52         * when the new ->mm is used for the first time.
  53         */
  54        __switch_mm(&new->context.id);
  55        down_write_nested(&new->mmap_sem, 1);
  56        uml_setup_stubs(new);
  57        up_write(&new->mmap_sem);
  58}
  59
  60static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
  61                             struct task_struct *tsk)
  62{
  63        unsigned cpu = smp_processor_id();
  64
  65        if(prev != next){
  66                cpumask_clear_cpu(cpu, mm_cpumask(prev));
  67                cpumask_set_cpu(cpu, mm_cpumask(next));
  68                if(next != &init_mm)
  69                        __switch_mm(&next->context.id);
  70        }
  71}
  72
  73static inline void enter_lazy_tlb(struct mm_struct *mm, 
  74                                  struct task_struct *tsk)
  75{
  76}
  77
  78extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  79
  80extern void destroy_context(struct mm_struct *mm);
  81
  82#endif
  83