1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
/*
* One C-SKY MMU TLB entry contain two PFN/page entry, ie:
* 1VPN -> 2PFN
*/
#define TLB_ENTRY_SIZE (PAGE_SIZE * 2)
#define TLB_ENTRY_SIZE_MASK (PAGE_MASK << 1)
void flush_tlb_all(void)
{
tlb_invalid_all();
}
void flush_tlb_mm(struct mm_struct *mm)
{
#ifdef CONFIG_CPU_HAS_TLBI
asm volatile("tlbi.asids %0"::"r"(cpu_asid(mm)));
#else
tlb_invalid_all();
#endif
}
/*
* MMU operation regs only could invalid tlb entry in jtlb and we
* need change asid field to invalid I-utlb & D-utlb.
*/
#ifndef CONFIG_CPU_HAS_TLBI
#define restore_asid_inv_utlb(oldpid, newpid) \
do { \
if (oldpid == newpid) \
write_mmu_entryhi(oldpid + 1); \
write_mmu_entryhi(oldpid); \
} while (0)
#endif
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
unsigned long newpid = cpu_asid(vma->vm_mm);
start &= TLB_ENTRY_SIZE_MASK;
end += TLB_ENTRY_SIZE - 1;
end &= TLB_ENTRY_SIZE_MASK;
#ifdef CONFIG_CPU_HAS_TLBI
while (start < end) {
asm volatile("tlbi.vas %0"::"r"(start | newpid));
start += 2*PAGE_SIZE;
}
sync_is();
#else
{
unsigned long flags, oldpid;
local_irq_save(flags);
oldpid = read_mmu_entryhi() & ASID_MASK;
while (start < end) {
int idx;
write_mmu_entryhi(start | newpid);
start += 2*PAGE_SIZE;
tlb_probe();
idx = read_mmu_index();
if (idx >= 0)
tlb_invalid_indexed();
}
restore_asid_inv_utlb(oldpid, newpid);
local_irq_restore(flags);
}
#endif
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
start &= TLB_ENTRY_SIZE_MASK;
end += TLB_ENTRY_SIZE - 1;
end &= TLB_ENTRY_SIZE_MASK;
#ifdef CONFIG_CPU_HAS_TLBI
while (start < end) {
asm volatile("tlbi.vaas %0"::"r"(start));
start += 2*PAGE_SIZE;
}
sync_is();
#else
{
unsigned long flags, oldpid;
local_irq_save(flags);
oldpid = read_mmu_entryhi() & ASID_MASK;
while (start < end) {
int idx;
write_mmu_entryhi(start | oldpid);
start += 2*PAGE_SIZE;
tlb_probe();
idx = read_mmu_index();
if (idx >= 0)
tlb_invalid_indexed();
}
restore_asid_inv_utlb(oldpid, oldpid);
local_irq_restore(flags);
}
#endif
}
void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
{
int newpid = cpu_asid(vma->vm_mm);
addr &= TLB_ENTRY_SIZE_MASK;
#ifdef CONFIG_CPU_HAS_TLBI
asm volatile("tlbi.vas %0"::"r"(addr | newpid));
sync_is();
#else
{
int oldpid, idx;
unsigned long flags;
local_irq_save(flags);
oldpid = read_mmu_entryhi() & ASID_MASK;
write_mmu_entryhi(addr | newpid);
tlb_probe();
idx = read_mmu_index();
if (idx >= 0)
tlb_invalid_indexed();
restore_asid_inv_utlb(oldpid, newpid);
local_irq_restore(flags);
}
#endif
}
void flush_tlb_one(unsigned long addr)
{
addr &= TLB_ENTRY_SIZE_MASK;
#ifdef CONFIG_CPU_HAS_TLBI
asm volatile("tlbi.vaas %0"::"r"(addr));
sync_is();
#else
{
int oldpid, idx;
unsigned long flags;
local_irq_save(flags);
oldpid = read_mmu_entryhi() & ASID_MASK;
write_mmu_entryhi(addr | oldpid);
tlb_probe();
idx = read_mmu_index();
if (idx >= 0)
tlb_invalid_indexed();
restore_asid_inv_utlb(oldpid, oldpid);
local_irq_restore(flags);
}
#endif
}
EXPORT_SYMBOL(flush_tlb_one);
|
