root/arch/um/include/asm/mmu_context.h

INCLUDED FROM

DEFINITIONS

1. arch_dup_mmap
2. arch_unmap
3. arch_bprm_mm_init
4. arch_vma_access_permitted
5. activate_mm
6. switch_mm
7. enter_lazy_tlb

   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 
  14 extern void uml_setup_stubs(struct mm_struct *mm);
  15 /*
  16  * Needed since we do not use the asm-generic/mm_hooks.h:
  17  */
  18 static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
  19 {
  20         uml_setup_stubs(mm);
  21         return 0;
  22 }
  23 extern void arch_exit_mmap(struct mm_struct *mm);
  24 static inline void arch_unmap(struct mm_struct *mm,
  25                         unsigned long start, unsigned long end)
  26 {
  27 }
  28 static inline void arch_bprm_mm_init(struct mm_struct *mm,
  29                                      struct vm_area_struct *vma)
  30 {
  31 }
  32 
  33 static 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 
  46 extern void force_flush_all(void);
  47 
  48 static 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 
  60 static 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 
  73 static inline void enter_lazy_tlb(struct mm_struct *mm, 
  74                                   struct task_struct *tsk)
  75 {
  76 }
  77 
  78 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  79 
  80 extern void destroy_context(struct mm_struct *mm);
  81 
  82 #endif