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Linux/arch/mn10300/include/asm/tlbflush.h

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  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 
 17 struct tlb_state {
 18         struct mm_struct        *active_mm;
 19         int                     state;
 20 };
 21 DECLARE_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  */
 26 static 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  */
 41 static 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  */
 49 static 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  */
 59 static inline
 60 void 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 
101 extern void flush_tlb_all(void);
102 extern void flush_tlb_current_task(void);
103 extern void flush_tlb_mm(struct mm_struct *);
104 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
105 
106 #define flush_tlb()             flush_tlb_current_task()
107 
108 static 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 
116 static inline void flush_tlb_all(void)
117 {
118         preempt_disable();
119         local_flush_tlb_all();
120         preempt_enable();
121 }
122 
123 static inline void flush_tlb_mm(struct mm_struct *mm)
124 {
125         preempt_disable();
126         local_flush_tlb_all();
127         preempt_enable();
128 }
129 
130 static 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 
143 static inline void flush_tlb_kernel_range(unsigned long start,
144                                           unsigned long end)
145 {
146         flush_tlb_all();
147 }
148 
149 static 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 

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