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

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  1 /*
  2  * MM context support for the Hexagon architecture
  3  *
  4  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 and
  8  * only version 2 as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18  * 02110-1301, USA.
 19  */
 20 
 21 #ifndef _ASM_MMU_CONTEXT_H
 22 #define _ASM_MMU_CONTEXT_H
 23 
 24 #include <linux/mm_types.h>
 25 
 26 #include <asm/setup.h>
 27 #include <asm/page.h>
 28 #include <asm/pgalloc.h>
 29 #include <asm/mem-layout.h>
 30 
 31 static inline void destroy_context(struct mm_struct *mm)
 32 {
 33 }
 34 
 35 /*
 36  * VM port hides all TLB management, so "lazy TLB" isn't very
 37  * meaningful.  Even for ports to architectures with visble TLBs,
 38  * this is almost invariably a null function.
 39  */
 40 static inline void enter_lazy_tlb(struct mm_struct *mm,
 41         struct task_struct *tsk)
 42 {
 43 }
 44 
 45 /*
 46  * Architecture-specific actions, if any, for memory map deactivation.
 47  */
 48 static inline void deactivate_mm(struct task_struct *tsk,
 49         struct mm_struct *mm)
 50 {
 51 }
 52 
 53 /**
 54  * init_new_context - initialize context related info for new mm_struct instance
 55  * @tsk: pointer to a task struct
 56  * @mm: pointer to a new mm struct
 57  */
 58 static inline int init_new_context(struct task_struct *tsk,
 59                                         struct mm_struct *mm)
 60 {
 61         /* mm->context is set up by pgd_alloc */
 62         return 0;
 63 }
 64 
 65 /*
 66  *  Switch active mm context
 67  */
 68 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 69                                 struct task_struct *tsk)
 70 {
 71         int l1;
 72 
 73         /*
 74          * For virtual machine, we have to update system map if it's been
 75          * touched.
 76          */
 77         if (next->context.generation < prev->context.generation) {
 78                 for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
 79                         next->pgd[l1] = init_mm.pgd[l1];
 80 
 81                 next->context.generation = prev->context.generation;
 82         }
 83 
 84         __vmnewmap((void *)next->context.ptbase);
 85 }
 86 
 87 /*
 88  *  Activate new memory map for task
 89  */
 90 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 91 {
 92         unsigned long flags;
 93 
 94         local_irq_save(flags);
 95         switch_mm(prev, next, current_thread_info()->task);
 96         local_irq_restore(flags);
 97 }
 98 
 99 /*  Generic hooks for arch_dup_mmap and arch_exit_mmap  */
100 #include <asm-generic/mm_hooks.h>
101 
102 #endif
103 

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