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
  18/*
  19 * VM port hides all TLB management, so "lazy TLB" isn't very
  20 * meaningful.  Even for ports to architectures with visble TLBs,
  21 * this is almost invariably a null function.
  22 *
  23 * mm->context is set up by pgd_alloc, so no init_new_context required.
  24 */
  25
  26/*
  27 *  Switch active mm context
  28 */
  29static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  30                                struct task_struct *tsk)
  31{
  32        int l1;
  33
  34        /*
  35         * For virtual machine, we have to update system map if it's been
  36         * touched.
  37         */
  38        if (next->context.generation < prev->context.generation) {
  39                for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
  40                        next->pgd[l1] = init_mm.pgd[l1];
  41
  42                next->context.generation = prev->context.generation;
  43        }
  44
  45        __vmnewmap((void *)next->context.ptbase);
  46}
  47
  48/*
  49 *  Activate new memory map for task
  50 */
  51#define activate_mm activate_mm
  52static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
  53{
  54        unsigned long flags;
  55
  56        local_irq_save(flags);
  57        switch_mm(prev, next, current_thread_info()->task);
  58        local_irq_restore(flags);
  59}
  60
  61/*  Generic hooks for arch_dup_mmap and arch_exit_mmap  */
  62#include <asm-generic/mm_hooks.h>
  63
  64#include <asm-generic/mmu_context.h>
  65
  66#endif
  67