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 83