2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
6 #ifndef __UM_MMU_CONTEXT_H
7 #define __UM_MMU_CONTEXT_H
9 #include <linux/sched.h>
12 extern void uml_setup_stubs(struct mm_struct *mm);
14 * Needed since we do not use the asm-generic/mm_hooks.h:
16 static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
20 extern void arch_exit_mmap(struct mm_struct *mm);
21 static inline void arch_unmap(struct mm_struct *mm,
22 struct vm_area_struct *vma,
23 unsigned long start, unsigned long end)
26 static inline void arch_bprm_mm_init(struct mm_struct *mm,
27 struct vm_area_struct *vma)
31 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
32 bool write, bool execute, bool foreign)
34 /* by default, allow everything */
38 static inline bool arch_pte_access_permitted(pte_t pte, bool write)
40 /* by default, allow everything */
45 * end asm-generic/mm_hooks.h functions
48 #define deactivate_mm(tsk,mm) do { } while (0)
50 extern void force_flush_all(void);
52 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
55 * This is called by fs/exec.c and sys_unshare()
56 * when the new ->mm is used for the first time.
58 __switch_mm(&new->context.id);
59 down_write(&new->mmap_sem);
61 up_write(&new->mmap_sem);
64 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
65 struct task_struct *tsk)
67 unsigned cpu = smp_processor_id();
70 cpumask_clear_cpu(cpu, mm_cpumask(prev));
71 cpumask_set_cpu(cpu, mm_cpumask(next));
73 __switch_mm(&next->context.id);
77 static inline void enter_lazy_tlb(struct mm_struct *mm,
78 struct task_struct *tsk)
82 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
84 extern void destroy_context(struct mm_struct *mm);