LXR linux/arch/hexagon/include/asm/mmu

   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
  18static 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 */
  27static 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 */
  35static 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 */
  45static 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 */
  55static 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 */
  77static 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