LXR linux/arch/mn10300/include/asm/tlbflush.h

   1/* MN10300 TLB flushing functions
   2 *
   3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public Licence
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the Licence, or (at your option) any later version.
  10 */
  11#ifndef _ASM_TLBFLUSH_H
  12#define _ASM_TLBFLUSH_H
  13
  14#include <linux/mm.h>
  15#include <asm/processor.h>
  16
  17struct tlb_state {
  18        struct mm_struct        *active_mm;
  19        int                     state;
  20};
  21DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
  22
  23/**
  24 * local_flush_tlb - Flush the current MM's entries from the local CPU's TLBs
  25 */
  26static inline void local_flush_tlb(void)
  27{
  28        int w;
  29        asm volatile(
  30                "       mov     %1,%0           \n"
  31                "       or      %2,%0           \n"
  32                "       mov     %0,%1           \n"
  33                : "=d"(w)
  34                : "m"(MMUCTR), "i"(MMUCTR_IIV|MMUCTR_DIV)
  35                : "cc", "memory");
  36}
  37
  38/**
  39 * local_flush_tlb_all - Flush all entries from the local CPU's TLBs
  40 */
  41static inline void local_flush_tlb_all(void)
  42{
  43        local_flush_tlb();
  44}
  45
  46/**
  47 * local_flush_tlb_one - Flush one entry from the local CPU's TLBs
  48 */
  49static inline void local_flush_tlb_one(unsigned long addr)
  50{
  51        local_flush_tlb();
  52}
  53
  54/**
  55 * local_flush_tlb_page - Flush a page's entry from the local CPU's TLBs
  56 * @mm: The MM to flush for
  57 * @addr: The address of the target page in RAM (not its page struct)
  58 */
  59static inline
  60void local_flush_tlb_page(struct mm_struct *mm, unsigned long addr)
  61{
  62        unsigned long pteu, flags, cnx;
  63
  64        addr &= PAGE_MASK;
  65
  66        local_irq_save(flags);
  67
  68        cnx = 1;
  69#ifdef CONFIG_MN10300_TLB_USE_PIDR
  70        cnx = mm->context.tlbpid[smp_processor_id()];
  71#endif
  72        if (cnx) {
  73                pteu = addr;
  74#ifdef CONFIG_MN10300_TLB_USE_PIDR
  75                pteu |= cnx & xPTEU_PID;
  76#endif
  77                IPTEU = pteu;
  78                DPTEU = pteu;
  79                if (IPTEL & xPTEL_V)
  80                        IPTEL = 0;
  81                if (DPTEL & xPTEL_V)
  82                        DPTEL = 0;
  83        }
  84        local_irq_restore(flags);
  85}
  86
  87/*
  88 * TLB flushing:
  89 *
  90 *  - flush_tlb() flushes the current mm struct TLBs
  91 *  - flush_tlb_all() flushes all processes TLBs
  92 *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  93 *  - flush_tlb_page(vma, vmaddr) flushes one page
  94 *  - flush_tlb_range(mm, start, end) flushes a range of pages
  95 *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
  96 */
  97#ifdef CONFIG_SMP
  98
  99#include <asm/smp.h>
 100
 101extern void flush_tlb_all(void);
 102extern void flush_tlb_current_task(void);
 103extern void flush_tlb_mm(struct mm_struct *);
 104extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 105
 106#define flush_tlb()             flush_tlb_current_task()
 107
 108static inline void flush_tlb_range(struct vm_area_struct *vma,
 109                                   unsigned long start, unsigned long end)
 110{
 111        flush_tlb_mm(vma->vm_mm);
 112}
 113
 114#else   /* CONFIG_SMP */
 115
 116static inline void flush_tlb_all(void)
 117{
 118        preempt_disable();
 119        local_flush_tlb_all();
 120        preempt_enable();
 121}
 122
 123static inline void flush_tlb_mm(struct mm_struct *mm)
 124{
 125        preempt_disable();
 126        local_flush_tlb_all();
 127        preempt_enable();
 128}
 129
 130static inline void flush_tlb_range(struct vm_area_struct *vma,
 131                                   unsigned long start, unsigned long end)
 132{
 133        preempt_disable();
 134        local_flush_tlb_all();
 135        preempt_enable();
 136}
 137
 138#define flush_tlb_page(vma, addr)       local_flush_tlb_page((vma)->vm_mm, addr)
 139#define flush_tlb()                     flush_tlb_all()
 140
 141#endif /* CONFIG_SMP */
 142
 143static inline void flush_tlb_kernel_range(unsigned long start,
 144                                          unsigned long end)
 145{
 146        flush_tlb_all();
 147}
 148
 149static inline void flush_tlb_pgtables(struct mm_struct *mm,
 150                                      unsigned long start, unsigned long end)
 151{
 152}
 153
 154#endif /* _ASM_TLBFLUSH_H */
 155