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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/* SPDX-License-Identifier: GPL-2.0 */
/* clear_page.S: UltraSparc optimized copy page.
*
* Copyright (C) 1996, 1998, 1999, 2000, 2004 David S. Miller (davem@redhat.com)
* Copyright (C) 1997 Jakub Jelinek (jakub@redhat.com)
*/
#include <asm/visasm.h>
#include <asm/thread_info.h>
#include <asm/page.h>
#include <linux/pgtable.h>
#include <asm/spitfire.h>
#include <asm/head.h>
#include <asm/export.h>
/* What we used to do was lock a TLB entry into a specific
* TLB slot, clear the page with interrupts disabled, then
* restore the original TLB entry. This was great for
* disturbing the TLB as little as possible, but it meant
* we had to keep interrupts disabled for a long time.
*
* Now, we simply use the normal TLB loading mechanism,
* and this makes the cpu choose a slot all by itself.
* Then we do a normal TLB flush on exit. We need only
* disable preemption during the clear.
*/
#define DCACHE_SIZE (PAGE_SIZE * 2)
#if (PAGE_SHIFT == 13)
#define PAGE_SIZE_REM 0x80
#elif (PAGE_SHIFT == 16)
#define PAGE_SIZE_REM 0x100
#else
#error Wrong PAGE_SHIFT specified
#endif
#define TOUCH(reg0, reg1, reg2, reg3, reg4, reg5, reg6, reg7) \
fsrc2 %reg0, %f48; fsrc2 %reg1, %f50; \
fsrc2 %reg2, %f52; fsrc2 %reg3, %f54; \
fsrc2 %reg4, %f56; fsrc2 %reg5, %f58; \
fsrc2 %reg6, %f60; fsrc2 %reg7, %f62;
.text
.align 32
.globl copy_user_page
.type copy_user_page,#function
EXPORT_SYMBOL(copy_user_page)
copy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */
lduw [%g6 + TI_PRE_COUNT], %o4
sethi %hi(PAGE_OFFSET), %g2
sethi %hi(PAGE_SIZE), %o3
ldx [%g2 + %lo(PAGE_OFFSET)], %g2
sethi %hi(PAGE_KERNEL_LOCKED), %g3
ldx [%g3 + %lo(PAGE_KERNEL_LOCKED)], %g3
sub %o0, %g2, %g1 ! dest paddr
sub %o1, %g2, %g2 ! src paddr
and %o2, %o3, %o0 ! vaddr D-cache alias bit
or %g1, %g3, %g1 ! dest TTE data
or %g2, %g3, %g2 ! src TTE data
sethi %hi(TLBTEMP_BASE), %o3
sethi %hi(DCACHE_SIZE), %o1
add %o0, %o3, %o0 ! dest TTE vaddr
add %o4, 1, %o2
add %o0, %o1, %o1 ! src TTE vaddr
/* Disable preemption. */
mov TLB_TAG_ACCESS, %g3
stw %o2, [%g6 + TI_PRE_COUNT]
/* Load TLB entries. */
rdpr %pstate, %o2
wrpr %o2, PSTATE_IE, %pstate
stxa %o0, [%g3] ASI_DMMU
stxa %g1, [%g0] ASI_DTLB_DATA_IN
membar #Sync
stxa %o1, [%g3] ASI_DMMU
stxa %g2, [%g0] ASI_DTLB_DATA_IN
membar #Sync
wrpr %o2, 0x0, %pstate
cheetah_copy_page_insn:
ba,pt %xcc, 9f
nop
1:
VISEntryHalf
membar #StoreLoad | #StoreStore | #LoadStore
sethi %hi((PAGE_SIZE/64)-2), %o2
mov %o0, %g1
prefetch [%o1 + 0x000], #one_read
or %o2, %lo((PAGE_SIZE/64)-2), %o2
prefetch [%o1 + 0x040], #one_read
prefetch [%o1 + 0x080], #one_read
prefetch [%o1 + 0x0c0], #one_read
ldd [%o1 + 0x000], %f0
prefetch [%o1 + 0x100], #one_read
ldd [%o1 + 0x008], %f2
prefetch [%o1 + 0x140], #one_read
ldd [%o1 + 0x010], %f4
prefetch [%o1 + 0x180], #one_read
fsrc2 %f0, %f16
ldd [%o1 + 0x018], %f6
fsrc2 %f2, %f18
ldd [%o1 + 0x020], %f8
fsrc2 %f4, %f20
ldd [%o1 + 0x028], %f10
fsrc2 %f6, %f22
ldd [%o1 + 0x030], %f12
fsrc2 %f8, %f24
ldd [%o1 + 0x038], %f14
fsrc2 %f10, %f26
ldd [%o1 + 0x040], %f0
1: ldd [%o1 + 0x048], %f2
fsrc2 %f12, %f28
ldd [%o1 + 0x050], %f4
fsrc2 %f14, %f30
stda %f16, [%o0] ASI_BLK_P
ldd [%o1 + 0x058], %f6
fsrc2 %f0, %f16
ldd [%o1 + 0x060], %f8
fsrc2 %f2, %f18
ldd [%o1 + 0x068], %f10
fsrc2 %f4, %f20
ldd [%o1 + 0x070], %f12
fsrc2 %f6, %f22
ldd [%o1 + 0x078], %f14
fsrc2 %f8, %f24
ldd [%o1 + 0x080], %f0
prefetch [%o1 + 0x180], #one_read
fsrc2 %f10, %f26
subcc %o2, 1, %o2
add %o0, 0x40, %o0
bne,pt %xcc, 1b
add %o1, 0x40, %o1
ldd [%o1 + 0x048], %f2
fsrc2 %f12, %f28
ldd [%o1 + 0x050], %f4
fsrc2 %f14, %f30
stda %f16, [%o0] ASI_BLK_P
ldd [%o1 + 0x058], %f6
fsrc2 %f0, %f16
ldd [%o1 + 0x060], %f8
fsrc2 %f2, %f18
ldd [%o1 + 0x068], %f10
fsrc2 %f4, %f20
ldd [%o1 + 0x070], %f12
fsrc2 %f6, %f22
add %o0, 0x40, %o0
ldd [%o1 + 0x078], %f14
fsrc2 %f8, %f24
fsrc2 %f10, %f26
fsrc2 %f12, %f28
fsrc2 %f14, %f30
stda %f16, [%o0] ASI_BLK_P
membar #Sync
VISExitHalf
ba,pt %xcc, 5f
nop
9:
VISEntry
ldub [%g6 + TI_FAULT_CODE], %g3
mov %o0, %g1
cmp %g3, 0
rd %asi, %g3
be,a,pt %icc, 1f
wr %g0, ASI_BLK_P, %asi
wr %g0, ASI_BLK_COMMIT_P, %asi
1: ldda [%o1] ASI_BLK_P, %f0
add %o1, 0x40, %o1
ldda [%o1] ASI_BLK_P, %f16
add %o1, 0x40, %o1
sethi %hi(PAGE_SIZE), %o2
1: TOUCH(f0, f2, f4, f6, f8, f10, f12, f14)
ldda [%o1] ASI_BLK_P, %f32
stda %f48, [%o0] %asi
add %o1, 0x40, %o1
sub %o2, 0x40, %o2
add %o0, 0x40, %o0
TOUCH(f16, f18, f20, f22, f24, f26, f28, f30)
ldda [%o1] ASI_BLK_P, %f0
stda %f48, [%o0] %asi
add %o1, 0x40, %o1
sub %o2, 0x40, %o2
add %o0, 0x40, %o0
TOUCH(f32, f34, f36, f38, f40, f42, f44, f46)
ldda [%o1] ASI_BLK_P, %f16
stda %f48, [%o0] %asi
sub %o2, 0x40, %o2
add %o1, 0x40, %o1
cmp %o2, PAGE_SIZE_REM
bne,pt %xcc, 1b
add %o0, 0x40, %o0
#if (PAGE_SHIFT == 16)
TOUCH(f0, f2, f4, f6, f8, f10, f12, f14)
ldda [%o1] ASI_BLK_P, %f32
stda %f48, [%o0] %asi
add %o1, 0x40, %o1
sub %o2, 0x40, %o2
add %o0, 0x40, %o0
TOUCH(f16, f18, f20, f22, f24, f26, f28, f30)
ldda [%o1] ASI_BLK_P, %f0
stda %f48, [%o0] %asi
add %o1, 0x40, %o1
sub %o2, 0x40, %o2
add %o0, 0x40, %o0
membar #Sync
stda %f32, [%o0] %asi
add %o0, 0x40, %o0
stda %f0, [%o0] %asi
#else
membar #Sync
stda %f0, [%o0] %asi
add %o0, 0x40, %o0
stda %f16, [%o0] %asi
#endif
membar #Sync
wr %g3, 0x0, %asi
VISExit
5:
stxa %g0, [%g1] ASI_DMMU_DEMAP
membar #Sync
sethi %hi(DCACHE_SIZE), %g2
stxa %g0, [%g1 + %g2] ASI_DMMU_DEMAP
membar #Sync
retl
stw %o4, [%g6 + TI_PRE_COUNT]
.size copy_user_page, .-copy_user_page
.globl cheetah_patch_copy_page
cheetah_patch_copy_page:
sethi %hi(0x01000000), %o1 ! NOP
sethi %hi(cheetah_copy_page_insn), %o0
or %o0, %lo(cheetah_copy_page_insn), %o0
stw %o1, [%o0]
membar #StoreStore
flush %o0
retl
nop
|
