1 /*
2 * arch/sh/mm/tlb-flush_64.c
3 *
4 * Copyright (C) 2000, 2001 Paolo Alberelli
5 * Copyright (C) 2003 Richard Curnow (/proc/tlb, bug fixes)
6 * Copyright (C) 2003 - 2012 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12 #include <linux/signal.h>
13 #include <linux/rwsem.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/string.h>
18 #include <linux/types.h>
19 #include <linux/ptrace.h>
20 #include <linux/mman.h>
21 #include <linux/mm.h>
22 #include <linux/smp.h>
23 #include <linux/perf_event.h>
24 #include <linux/interrupt.h>
25 #include <asm/io.h>
26 #include <asm/tlb.h>
27 #include <linux/uaccess.h>
28 #include <asm/pgalloc.h>
29 #include <asm/mmu_context.h>
30
local_flush_tlb_one(unsigned long asid,unsigned long page)31 void local_flush_tlb_one(unsigned long asid, unsigned long page)
32 {
33 unsigned long long match, pteh=0, lpage;
34 unsigned long tlb;
35
36 /*
37 * Sign-extend based on neff.
38 */
39 lpage = neff_sign_extend(page);
40 match = (asid << PTEH_ASID_SHIFT) | PTEH_VALID;
41 match |= lpage;
42
43 for_each_itlb_entry(tlb) {
44 asm volatile ("getcfg %1, 0, %0"
45 : "=r" (pteh)
46 : "r" (tlb) );
47
48 if (pteh == match) {
49 __flush_tlb_slot(tlb);
50 break;
51 }
52 }
53
54 for_each_dtlb_entry(tlb) {
55 asm volatile ("getcfg %1, 0, %0"
56 : "=r" (pteh)
57 : "r" (tlb) );
58
59 if (pteh == match) {
60 __flush_tlb_slot(tlb);
61 break;
62 }
63
64 }
65 }
66
local_flush_tlb_page(struct vm_area_struct * vma,unsigned long page)67 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
68 {
69 unsigned long flags;
70
71 if (vma->vm_mm) {
72 page &= PAGE_MASK;
73 local_irq_save(flags);
74 local_flush_tlb_one(get_asid(), page);
75 local_irq_restore(flags);
76 }
77 }
78
local_flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)79 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
80 unsigned long end)
81 {
82 unsigned long flags;
83 unsigned long long match, pteh=0, pteh_epn, pteh_low;
84 unsigned long tlb;
85 unsigned int cpu = smp_processor_id();
86 struct mm_struct *mm;
87
88 mm = vma->vm_mm;
89 if (cpu_context(cpu, mm) == NO_CONTEXT)
90 return;
91
92 local_irq_save(flags);
93
94 start &= PAGE_MASK;
95 end &= PAGE_MASK;
96
97 match = (cpu_asid(cpu, mm) << PTEH_ASID_SHIFT) | PTEH_VALID;
98
99 /* Flush ITLB */
100 for_each_itlb_entry(tlb) {
101 asm volatile ("getcfg %1, 0, %0"
102 : "=r" (pteh)
103 : "r" (tlb) );
104
105 pteh_epn = pteh & PAGE_MASK;
106 pteh_low = pteh & ~PAGE_MASK;
107
108 if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
109 __flush_tlb_slot(tlb);
110 }
111
112 /* Flush DTLB */
113 for_each_dtlb_entry(tlb) {
114 asm volatile ("getcfg %1, 0, %0"
115 : "=r" (pteh)
116 : "r" (tlb) );
117
118 pteh_epn = pteh & PAGE_MASK;
119 pteh_low = pteh & ~PAGE_MASK;
120
121 if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
122 __flush_tlb_slot(tlb);
123 }
124
125 local_irq_restore(flags);
126 }
127
local_flush_tlb_mm(struct mm_struct * mm)128 void local_flush_tlb_mm(struct mm_struct *mm)
129 {
130 unsigned long flags;
131 unsigned int cpu = smp_processor_id();
132
133 if (cpu_context(cpu, mm) == NO_CONTEXT)
134 return;
135
136 local_irq_save(flags);
137
138 cpu_context(cpu, mm) = NO_CONTEXT;
139 if (mm == current->mm)
140 activate_context(mm, cpu);
141
142 local_irq_restore(flags);
143 }
144
local_flush_tlb_all(void)145 void local_flush_tlb_all(void)
146 {
147 /* Invalidate all, including shared pages, excluding fixed TLBs */
148 unsigned long flags, tlb;
149
150 local_irq_save(flags);
151
152 /* Flush each ITLB entry */
153 for_each_itlb_entry(tlb)
154 __flush_tlb_slot(tlb);
155
156 /* Flush each DTLB entry */
157 for_each_dtlb_entry(tlb)
158 __flush_tlb_slot(tlb);
159
160 local_irq_restore(flags);
161 }
162
local_flush_tlb_kernel_range(unsigned long start,unsigned long end)163 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
164 {
165 /* FIXME: Optimize this later.. */
166 flush_tlb_all();
167 }
168
__flush_tlb_global(void)169 void __flush_tlb_global(void)
170 {
171 flush_tlb_all();
172 }
173