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 */
local_flush_tlb(void)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 */
local_flush_tlb_all(void)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 */
local_flush_tlb_one(unsigned long addr)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
local_flush_tlb_page(struct mm_struct * mm,unsigned long addr)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
flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)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
flush_tlb_all(void)116 static inline void flush_tlb_all(void)
117 {
118 preempt_disable();
119 local_flush_tlb_all();
120 preempt_enable();
121 }
122
flush_tlb_mm(struct mm_struct * mm)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
flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)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
flush_tlb_kernel_range(unsigned long start,unsigned long end)143 static inline void flush_tlb_kernel_range(unsigned long start,
144 unsigned long end)
145 {
146 flush_tlb_all();
147 }
148
flush_tlb_pgtables(struct mm_struct * mm,unsigned long start,unsigned long end)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