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