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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
###############################################################################
#
# TLB loading functions
#
# Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Modified by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/intctl-regs.h>
#include <asm/frame.inc>
#include <asm/page.h>
#include <asm/pgtable.h>
###############################################################################
#
# Instruction TLB Miss handler entry point
#
###############################################################################
.type itlb_miss,@function
ENTRY(itlb_miss)
#ifdef CONFIG_GDBSTUB
movm [d2,d3,a2],(sp)
#else
or EPSW_nAR,epsw # switch D0-D3 & A0-A3 to the alternate
# register bank
nop
nop
nop
#endif
#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
mov (MMUCTR),d2
mov d2,(MMUCTR)
#endif
and ~EPSW_NMID,epsw
mov (IPTEU),d3
mov (PTBR),a2
mov d3,d2
and 0xffc00000,d2
lsr 20,d2
mov (a2,d2),a2 # PTD *ptd = PGD[addr 31..22]
btst _PAGE_VALID,a2
beq itlb_miss_fault # jump if doesn't point anywhere
and ~(PAGE_SIZE-1),a2
mov d3,d2
and 0x003ff000,d2
lsr 10,d2
add d2,a2
mov (a2),d2 # get pte from PTD[addr 21..12]
btst _PAGE_VALID,d2
beq itlb_miss_fault # jump if doesn't point to a page
# (might be a swap id)
#if ((_PAGE_ACCESSED & 0xffffff00) == 0)
bset _PAGE_ACCESSED,(0,a2)
#elif ((_PAGE_ACCESSED & 0xffff00ff) == 0)
bset +(_PAGE_ACCESSED >> 8),(1,a2)
#else
#error "_PAGE_ACCESSED value is out of range"
#endif
and ~xPTEL2_UNUSED1,d2
itlb_miss_set:
mov d2,(IPTEL2) # change the TLB
#ifdef CONFIG_GDBSTUB
movm (sp),[d2,d3,a2]
#endif
rti
itlb_miss_fault:
mov _PAGE_VALID,d2 # force address error handler to be
# invoked
bra itlb_miss_set
.size itlb_miss, . - itlb_miss
###############################################################################
#
# Data TLB Miss handler entry point
#
###############################################################################
.type dtlb_miss,@function
ENTRY(dtlb_miss)
#ifdef CONFIG_GDBSTUB
movm [d2,d3,a2],(sp)
#else
or EPSW_nAR,epsw # switch D0-D3 & A0-A3 to the alternate
# register bank
nop
nop
nop
#endif
#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
mov (MMUCTR),d2
mov d2,(MMUCTR)
#endif
and ~EPSW_NMID,epsw
mov (DPTEU),d3
mov (PTBR),a2
mov d3,d2
and 0xffc00000,d2
lsr 20,d2
mov (a2,d2),a2 # PTD *ptd = PGD[addr 31..22]
btst _PAGE_VALID,a2
beq dtlb_miss_fault # jump if doesn't point anywhere
and ~(PAGE_SIZE-1),a2
mov d3,d2
and 0x003ff000,d2
lsr 10,d2
add d2,a2
mov (a2),d2 # get pte from PTD[addr 21..12]
btst _PAGE_VALID,d2
beq dtlb_miss_fault # jump if doesn't point to a page
# (might be a swap id)
#if ((_PAGE_ACCESSED & 0xffffff00) == 0)
bset _PAGE_ACCESSED,(0,a2)
#elif ((_PAGE_ACCESSED & 0xffff00ff) == 0)
bset +(_PAGE_ACCESSED >> 8),(1,a2)
#else
#error "_PAGE_ACCESSED value is out of range"
#endif
and ~xPTEL2_UNUSED1,d2
dtlb_miss_set:
mov d2,(DPTEL2) # change the TLB
#ifdef CONFIG_GDBSTUB
movm (sp),[d2,d3,a2]
#endif
rti
dtlb_miss_fault:
mov _PAGE_VALID,d2 # force address error handler to be
# invoked
bra dtlb_miss_set
.size dtlb_miss, . - dtlb_miss
###############################################################################
#
# Instruction TLB Address Error handler entry point
#
###############################################################################
.type itlb_aerror,@function
ENTRY(itlb_aerror)
add -4,sp
SAVE_ALL
#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
mov (MMUCTR),d1
mov d1,(MMUCTR)
#endif
and ~EPSW_NMID,epsw
add -4,sp # need to pass three params
# calculate the fault code
movhu (MMUFCR_IFC),d1
or 0x00010000,d1 # it's an instruction fetch
# determine the page address
mov (IPTEU),d0
and PAGE_MASK,d0
mov d0,(12,sp)
clr d0
mov d0,(IPTEL2)
or EPSW_IE,epsw
mov fp,d0
call do_page_fault[],0 # do_page_fault(regs,code,addr
jmp ret_from_exception
.size itlb_aerror, . - itlb_aerror
###############################################################################
#
# Data TLB Address Error handler entry point
#
###############################################################################
.type dtlb_aerror,@function
ENTRY(dtlb_aerror)
add -4,sp
SAVE_ALL
#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
mov (MMUCTR),d1
mov d1,(MMUCTR)
#endif
add -4,sp # need to pass three params
and ~EPSW_NMID,epsw
# calculate the fault code
movhu (MMUFCR_DFC),d1
# determine the page address
mov (DPTEU),a2
mov a2,d0
and PAGE_MASK,d0
mov d0,(12,sp)
clr d0
mov d0,(DPTEL2)
or EPSW_IE,epsw
mov fp,d0
call do_page_fault[],0 # do_page_fault(regs,code,addr
jmp ret_from_exception
.size dtlb_aerror, . - dtlb_aerror
|
