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 #include <linux/mmap_lock.h> 12 13 #include <asm/mmu.h> 14 15 extern void uml_setup_stubs(struct mm_struct *mm); 16 /* 17 * Needed since we do not use the asm-generic/mm_hooks.h: 18 */ 19 static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) 20 { 21 uml_setup_stubs(mm); 22 return 0; 23 } 24 extern void arch_exit_mmap(struct mm_struct *mm); 25 static inline void arch_unmap(struct mm_struct *mm, 26 unsigned long start, unsigned long end) 27 { 28 } 29 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 30 bool write, bool execute, bool foreign) 31 { 32 /* by default, allow everything */ 33 return true; 34 } 35 36 /* 37 * end asm-generic/mm_hooks.h functions 38 */ 39 40 extern void force_flush_all(void); 41 42 #define activate_mm activate_mm 43 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) 44 { 45 /* 46 * This is called by fs/exec.c and sys_unshare() 47 * when the new ->mm is used for the first time. 48 */ 49 __switch_mm(&new->context.id); 50 mmap_write_lock_nested(new, SINGLE_DEPTH_NESTING); 51 uml_setup_stubs(new); 52 mmap_write_unlock(new); 53 } 54 55 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 56 struct task_struct *tsk) 57 { 58 unsigned cpu = smp_processor_id(); 59 60 if(prev != next){ 61 cpumask_clear_cpu(cpu, mm_cpumask(prev)); 62 cpumask_set_cpu(cpu, mm_cpumask(next)); 63 if(next != &init_mm) 64 __switch_mm(&next->context.id); 65 } 66 } 67 68 #define init_new_context init_new_context 69 extern int init_new_context(struct task_struct *task, struct mm_struct *mm); 70 71 #define destroy_context destroy_context 72 extern void destroy_context(struct mm_struct *mm); 73 74 #include <asm-generic/mmu_context.h> 75 76 #endif 77