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TOMOYO Linux Cross Reference
Linux/arch/hexagon/include/asm/mmu_context.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * MM context support for the Hexagon architecture
  4  *
  5  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
  6  */
  7 
  8 #ifndef _ASM_MMU_CONTEXT_H
  9 #define _ASM_MMU_CONTEXT_H
 10 
 11 #include <linux/mm_types.h>
 12 
 13 #include <asm/setup.h>
 14 #include <asm/page.h>
 15 #include <asm/pgalloc.h>
 16 #include <asm/mem-layout.h>
 17 
 18 static inline void destroy_context(struct mm_struct *mm)
 19 {
 20 }
 21 
 22 /*
 23  * VM port hides all TLB management, so "lazy TLB" isn't very
 24  * meaningful.  Even for ports to architectures with visble TLBs,
 25  * this is almost invariably a null function.
 26  */
 27 static inline void enter_lazy_tlb(struct mm_struct *mm,
 28         struct task_struct *tsk)
 29 {
 30 }
 31 
 32 /*
 33  * Architecture-specific actions, if any, for memory map deactivation.
 34  */
 35 static inline void deactivate_mm(struct task_struct *tsk,
 36         struct mm_struct *mm)
 37 {
 38 }
 39 
 40 /**
 41  * init_new_context - initialize context related info for new mm_struct instance
 42  * @tsk: pointer to a task struct
 43  * @mm: pointer to a new mm struct
 44  */
 45 static inline int init_new_context(struct task_struct *tsk,
 46                                         struct mm_struct *mm)
 47 {
 48         /* mm->context is set up by pgd_alloc */
 49         return 0;
 50 }
 51 
 52 /*
 53  *  Switch active mm context
 54  */
 55 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 56                                 struct task_struct *tsk)
 57 {
 58         int l1;
 59 
 60         /*
 61          * For virtual machine, we have to update system map if it's been
 62          * touched.
 63          */
 64         if (next->context.generation < prev->context.generation) {
 65                 for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
 66                         next->pgd[l1] = init_mm.pgd[l1];
 67 
 68                 next->context.generation = prev->context.generation;
 69         }
 70 
 71         __vmnewmap((void *)next->context.ptbase);
 72 }
 73 
 74 /*
 75  *  Activate new memory map for task
 76  */
 77 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 78 {
 79         unsigned long flags;
 80 
 81         local_irq_save(flags);
 82         switch_mm(prev, next, current_thread_info()->task);
 83         local_irq_restore(flags);
 84 }
 85 
 86 /*  Generic hooks for arch_dup_mmap and arch_exit_mmap  */
 87 #include <asm-generic/mm_hooks.h>
 88 
 89 #endif
 90 

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