LXR linux/arch/hexagon/mm/vm

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Hexagon Virtual Machine TLB functions
   4 *
   5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   6 */
   7
   8/*
   9 * The Hexagon Virtual Machine conceals the real workings of
  10 * the TLB, but there are one or two functions that need to
  11 * be instantiated for it, differently from a native build.
  12 */
  13#include <linux/mm.h>
  14#include <linux/sched.h>
  15#include <asm/page.h>
  16#include <asm/hexagon_vm.h>
  17
  18/*
  19 * Initial VM implementation has only one map active at a time, with
  20 * TLB purgings on changes.  So either we're nuking the current map,
  21 * or it's a no-op.  This operation is messy on true SMPs where other
  22 * processors must be induced to flush the copies in their local TLBs,
  23 * but Hexagon thread-based virtual processors share the same MMU.
  24 */
  25void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  26                        unsigned long end)
  27{
  28        struct mm_struct *mm = vma->vm_mm;
  29
  30        if (mm->context.ptbase == current->active_mm->context.ptbase)
  31                __vmclrmap((void *)start, end - start);
  32}
  33
  34/*
  35 * Flush a page from the kernel virtual map - used by highmem
  36 */
  37void flush_tlb_one(unsigned long vaddr)
  38{
  39        __vmclrmap((void *)vaddr, PAGE_SIZE);
  40}
  41
  42/*
  43 * Flush all TLBs across all CPUs, virtual or real.
  44 * A single Hexagon core has 6 thread contexts but
  45 * only one TLB.
  46 */
  47void tlb_flush_all(void)
  48{
  49        /*  should probably use that fixaddr end or whateve label  */
  50        __vmclrmap(0, 0xffff0000);
  51}
  52
  53/*
  54 * Flush TLB entries associated with a given mm_struct mapping.
  55 */
  56void flush_tlb_mm(struct mm_struct *mm)
  57{
  58        /* Current Virtual Machine has only one map active at a time */
  59        if (current->active_mm->context.ptbase == mm->context.ptbase)
  60                tlb_flush_all();
  61}
  62
  63/*
  64 * Flush TLB state associated with a page of a vma.
  65 */
  66void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
  67{
  68        struct mm_struct *mm = vma->vm_mm;
  69
  70        if (mm->context.ptbase  == current->active_mm->context.ptbase)
  71                __vmclrmap((void *)vaddr, PAGE_SIZE);
  72}
  73
  74/*
  75 * Flush TLB entries associated with a kernel address range.
  76 * Like flush range, but without the check on the vma->vm_mm.
  77 */
  78void flush_tlb_kernel_range(unsigned long start, unsigned long end)
  79{
  80                __vmclrmap((void *)start, end - start);
  81}
  82