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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*/
#ifndef __UM_MMU_CONTEXT_H
#define __UM_MMU_CONTEXT_H
#include <linux/sched.h>
#include <linux/mm_types.h>
#include <asm/mmu.h>
extern void uml_setup_stubs(struct mm_struct *mm);
/*
* Needed since we do not use the asm-generic/mm_hooks.h:
*/
static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
{
uml_setup_stubs(mm);
return 0;
}
extern void arch_exit_mmap(struct mm_struct *mm);
static inline void arch_unmap(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}
static inline void arch_bprm_mm_init(struct mm_struct *mm,
struct vm_area_struct *vma)
{
}
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
bool write, bool execute, bool foreign)
{
/* by default, allow everything */
return true;
}
/*
* end asm-generic/mm_hooks.h functions
*/
#define deactivate_mm(tsk,mm) do { } while (0)
extern void force_flush_all(void);
static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
{
/*
* This is called by fs/exec.c and sys_unshare()
* when the new ->mm is used for the first time.
*/
__switch_mm(&new->context.id);
down_write_nested(&new->mmap_sem, 1);
uml_setup_stubs(new);
up_write(&new->mmap_sem);
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
unsigned cpu = smp_processor_id();
if(prev != next){
cpumask_clear_cpu(cpu, mm_cpumask(prev));
cpumask_set_cpu(cpu, mm_cpumask(next));
if(next != &init_mm)
__switch_mm(&next->context.id);
}
}
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
extern void destroy_context(struct mm_struct *mm);
#endif
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