text: /* SPDX-License-Identifier: GPL-2.0-only */
  /*
   * MM context support for the Hexagon architecture
   *
   * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   */
  
  #ifndef _ASM_MMU_CONTEXT_H
  #define _ASM_MMU_CONTEXT_H
  
  #include <linux/mm_types.h>
  
  #include <asm/setup.h>
  #include <asm/page.h>
  #include <asm/pgalloc.h>
  #include <asm/mem-layout.h>
  
  static inline void destroy_context(struct mm_struct *mm)
  {
  }
  
  /*
   * VM port hides all TLB management, so "lazy TLB" isn't very
   * meaningful.  Even for ports to architectures with visble TLBs,
   * this is almost invariably a null function.
   */
  static inline void enter_lazy_tlb(struct mm_struct *mm,
  	struct task_struct *tsk)
  {
  }
  
  /*
   * Architecture-specific actions, if any, for memory map deactivation.
   */
  static inline void deactivate_mm(struct task_struct *tsk,
  	struct mm_struct *mm)
  {
  }
  
  /**
   * init_new_context - initialize context related info for new mm_struct instance
   * @tsk: pointer to a task struct
   * @mm: pointer to a new mm struct
   */
  static inline int init_new_context(struct task_struct *tsk,
  					struct mm_struct *mm)
  {
  	/* mm->context is set up by pgd_alloc */
  	return 0;
  }
  
  /*
   *  Switch active mm context
   */
  static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  				struct task_struct *tsk)
  {
  	int l1;
  
  	/*
  	 * For virtual machine, we have to update system map if it's been
  	 * touched.
  	 */
  	if (next->context.generation < prev->context.generation) {
  		for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
  			next->pgd[l1] = init_mm.pgd[l1];
  
  		next->context.generation = prev->context.generation;
  	}
  
  	__vmnewmap((void *)next->context.ptbase);
  }
  
  /*
   *  Activate new memory map for task
   */
  static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
  {
  	unsigned long flags;
  
  	local_irq_save(flags);
  	switch_mm(prev, next, current_thread_info()->task);
  	local_irq_restore(flags);
  }
  
  /*  Generic hooks for arch_dup_mmap and arch_exit_mmap  */
  #include <asm-generic/mm_hooks.h>
  
  #endif
  