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1 | # |
1 | # |
2 | # Copyright (c) 2006 Martin Decky |
2 | # Copyright (c) 2006 Martin Decky |
3 | # All rights reserved. |
3 | # All rights reserved. |
4 | # |
4 | # |
5 | # Redistribution and use in source and binary forms, with or without |
5 | # Redistribution and use in source and binary forms, with or without |
6 | # modification, are permitted provided that the following conditions |
6 | # modification, are permitted provided that the following conditions |
7 | # are met: |
7 | # are met: |
8 | # |
8 | # |
9 | # - Redistributions of source code must retain the above copyright |
9 | # - Redistributions of source code must retain the above copyright |
10 | # notice, this list of conditions and the following disclaimer. |
10 | # notice, this list of conditions and the following disclaimer. |
11 | # - Redistributions in binary form must reproduce the above copyright |
11 | # - Redistributions in binary form must reproduce the above copyright |
12 | # notice, this list of conditions and the following disclaimer in the |
12 | # notice, this list of conditions and the following disclaimer in the |
13 | # documentation and/or other materials provided with the distribution. |
13 | # documentation and/or other materials provided with the distribution. |
14 | # - The name of the author may not be used to endorse or promote products |
14 | # - The name of the author may not be used to endorse or promote products |
15 | # derived from this software without specific prior written permission. |
15 | # derived from this software without specific prior written permission. |
16 | # |
16 | # |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | 28 | ||
29 | #include "asm.h" |
29 | #include "asm.h" |
30 | #include "regname.h" |
30 | #include "regname.h" |
31 | #include "debug.inc" |
- | |
32 | 31 | ||
33 | .text |
32 | .text |
34 | 33 | ||
35 | .global halt |
34 | .global halt |
36 | .global memcpy |
35 | .global memcpy |
37 | .global jump_to_kernel |
36 | .global jump_to_kernel |
38 | 37 | ||
39 | halt: |
38 | halt: |
40 | b halt |
39 | b halt |
41 | 40 | ||
42 | memcpy: |
41 | memcpy: |
43 | srwi. r7, r5, 3 |
42 | srwi. r7, r5, 3 |
44 | addi r6, r3, -4 |
43 | addi r6, r3, -4 |
45 | addi r4, r4, -4 |
44 | addi r4, r4, -4 |
46 | beq 2f |
45 | beq 2f |
47 | 46 | ||
48 | andi. r0, r6, 3 |
47 | andi. r0, r6, 3 |
49 | mtctr r7 |
48 | mtctr r7 |
50 | bne 5f |
49 | bne 5f |
51 | 50 | ||
52 | 1: |
51 | 1: |
53 | 52 | ||
54 | lwz r7, 4(r4) |
53 | lwz r7, 4(r4) |
55 | lwzu r8, 8(r4) |
54 | lwzu r8, 8(r4) |
56 | stw r7, 4(r6) |
55 | stw r7, 4(r6) |
57 | stwu r8, 8(r6) |
56 | stwu r8, 8(r6) |
58 | bdnz 1b |
57 | bdnz 1b |
59 | 58 | ||
60 | andi. r5, r5, 7 |
59 | andi. r5, r5, 7 |
61 | 60 | ||
62 | 2: |
61 | 2: |
63 | 62 | ||
64 | cmplwi 0, r5, 4 |
63 | cmplwi 0, r5, 4 |
65 | blt 3f |
64 | blt 3f |
66 | 65 | ||
67 | lwzu r0, 4(r4) |
66 | lwzu r0, 4(r4) |
68 | addi r5, r5, -4 |
67 | addi r5, r5, -4 |
69 | stwu r0, 4(r6) |
68 | stwu r0, 4(r6) |
70 | 69 | ||
71 | 3: |
70 | 3: |
72 | 71 | ||
73 | cmpwi 0, r5, 0 |
72 | cmpwi 0, r5, 0 |
74 | beqlr |
73 | beqlr |
75 | mtctr r5 |
74 | mtctr r5 |
76 | addi r4, r4, 3 |
75 | addi r4, r4, 3 |
77 | addi r6, r6, 3 |
76 | addi r6, r6, 3 |
78 | 77 | ||
79 | 4: |
78 | 4: |
80 | 79 | ||
81 | lbzu r0, 1(r4) |
80 | lbzu r0, 1(r4) |
82 | stbu r0, 1(r6) |
81 | stbu r0, 1(r6) |
83 | bdnz 4b |
82 | bdnz 4b |
84 | blr |
83 | blr |
85 | 84 | ||
86 | 5: |
85 | 5: |
87 | 86 | ||
88 | subfic r0, r0, 4 |
87 | subfic r0, r0, 4 |
89 | mtctr r0 |
88 | mtctr r0 |
90 | 89 | ||
91 | 6: |
90 | 6: |
92 | 91 | ||
93 | lbz r7, 4(r4) |
92 | lbz r7, 4(r4) |
94 | addi r4, r4, 1 |
93 | addi r4, r4, 1 |
95 | stb r7, 4(r6) |
94 | stb r7, 4(r6) |
96 | addi r6, r6, 1 |
95 | addi r6, r6, 1 |
97 | bdnz 6b |
96 | bdnz 6b |
98 | subf r5, r0, r5 |
97 | subf r5, r0, r5 |
99 | rlwinm. r7, r5, 32-3, 3, 31 |
98 | rlwinm. r7, r5, 32-3, 3, 31 |
100 | beq 2b |
99 | beq 2b |
101 | mtctr r7 |
100 | mtctr r7 |
102 | b 1b |
101 | b 1b |
103 | 102 | ||
104 | 103 | ||
105 | jump_to_kernel: |
104 | jump_to_kernel: |
106 | 105 | ||
107 | # r3 = bootinfo (pa) |
106 | # r3 = bootinfo (pa) |
108 | # r4 = bootinfo_size |
107 | # r4 = bootinfo_size |
109 | # r5 = trans (pa) |
108 | # r5 = trans (pa) |
110 | # r6 = bytes to copy |
109 | # r6 = bytes to copy |
111 | # r7 = real_mode (pa) |
110 | # r7 = real_mode (pa) |
112 | # r8 = framebuffer (pa) |
111 | # r8 = framebuffer (pa) |
113 | # r9 = scanline |
112 | # r9 = scanline |
114 | 113 | ||
115 | # disable interrupts |
114 | # disable interrupts |
116 | 115 | ||
117 | mfmsr r31 |
116 | mfmsr r31 |
118 | rlwinm r31, r31, 0, 17, 15 |
117 | rlwinm r31, r31, 0, 17, 15 |
119 | mtmsr r31 |
118 | mtmsr r31 |
120 | 119 | ||
121 | # set real_mode meeting point address |
120 | # set real_mode meeting point address |
122 | 121 | ||
123 | mtspr srr0, r7 |
122 | mtspr srr0, r7 |
124 | 123 | ||
125 | # jumps to real_mode |
124 | # jumps to real_mode |
126 | 125 | ||
127 | mfmsr r31 |
126 | mfmsr r31 |
128 | lis r30, ~0@h |
127 | lis r30, ~0@h |
129 | ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l |
128 | ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l |
130 | and r31, r31, r30 |
129 | and r31, r31, r30 |
131 | mtspr srr1, r31 |
130 | mtspr srr1, r31 |
132 | 131 | ||
133 | sync |
132 | sync |
134 | isync |
133 | isync |
135 | rfi |
134 | rfi |
136 | 135 | ||
137 | .section REALMODE, "ax" |
136 | .section REALMODE, "ax" |
138 | .align PAGE_WIDTH |
137 | .align PAGE_WIDTH |
139 | .global real_mode |
138 | .global real_mode |
140 | 139 | ||
141 | real_mode: |
140 | real_mode: |
142 | 141 | ||
143 | DEBUG_INIT |
- | |
144 | DEBUG_real_mode |
- | |
145 | - | ||
146 | # copy kernel to proper location |
142 | # copy kernel to proper location |
147 | # |
143 | # |
148 | # r5 = trans (pa) |
144 | # r5 = trans (pa) |
149 | # r6 = bytes to copy |
145 | # r6 = bytes to copy |
150 | # r8 = framebuffer (pa) |
146 | # r8 = framebuffer (pa) |
151 | # r9 = scanline |
147 | # r9 = scanline |
152 | 148 | ||
153 | li r31, PAGE_SIZE >> 2 |
149 | li r31, PAGE_SIZE >> 2 |
154 | li r30, 0 |
150 | li r30, 0 |
155 | 151 | ||
156 | page_copy: |
152 | page_copy: |
157 | 153 | ||
158 | cmpwi r6, 0 |
154 | cmpwi r6, 0 |
159 | beq copy_end |
155 | beq copy_end |
160 | 156 | ||
161 | # copy page |
157 | # copy page |
162 | 158 | ||
163 | mtctr r31 |
159 | mtctr r31 |
164 | lwz r29, 0(r5) |
160 | lwz r29, 0(r5) |
165 | 161 | ||
166 | DEBUG_INIT |
- | |
167 | DEBUG_copy_loop |
- | |
168 | - | ||
169 | copy_loop: |
162 | copy_loop: |
170 | 163 | ||
171 | lwz r28, 0(r29) |
164 | lwz r28, 0(r29) |
172 | stw r28, 0(r30) |
165 | stw r28, 0(r30) |
173 | 166 | ||
174 | addi r29, r29, 4 |
167 | addi r29, r29, 4 |
175 | addi r30, r30, 4 |
168 | addi r30, r30, 4 |
176 | subi r6, r6, 4 |
169 | subi r6, r6, 4 |
177 | 170 | ||
178 | cmpwi r6, 0 |
171 | cmpwi r6, 0 |
179 | beq copy_end |
172 | beq copy_end |
180 | 173 | ||
181 | bdnz copy_loop |
174 | bdnz copy_loop |
182 | 175 | ||
183 | DEBUG_end_copy_loop |
- | |
184 | - | ||
185 | addi r5, r5, 4 |
176 | addi r5, r5, 4 |
186 | b page_copy |
177 | b page_copy |
187 | 178 | ||
188 | copy_end: |
179 | copy_end: |
189 | 180 | ||
190 | DEBUG_segments |
- | |
191 | - | ||
192 | # initially fill segment registers |
181 | # initially fill segment registers |
193 | 182 | ||
194 | li r31, 0 |
183 | li r31, 0 |
195 | 184 | ||
196 | li r29, 8 |
185 | li r29, 8 |
197 | mtctr r29 |
186 | mtctr r29 |
198 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
187 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
199 | 188 | ||
200 | seg_fill_uspace: |
189 | seg_fill_uspace: |
201 | 190 | ||
202 | mtsrin r30, r31 |
191 | mtsrin r30, r31 |
203 | addi r30, r30, 1 |
192 | addi r30, r30, 1 |
204 | addis r31, r31, 0x1000 # move to next SR |
193 | addis r31, r31, 0x1000 # move to next SR |
205 | 194 | ||
206 | bdnz seg_fill_uspace |
195 | bdnz seg_fill_uspace |
207 | 196 | ||
208 | li r29, 8 |
197 | li r29, 8 |
209 | mtctr r29 |
198 | mtctr r29 |
210 | lis r30, 0x4000 # priviledged access only |
199 | lis r30, 0x4000 # priviledged access only |
211 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) |
200 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) |
212 | 201 | ||
213 | seg_fill_kernel: |
202 | seg_fill_kernel: |
214 | 203 | ||
215 | mtsrin r30, r31 |
204 | mtsrin r30, r31 |
216 | addi r30, r30, 1 |
205 | addi r30, r30, 1 |
217 | addis r31, r31, 0x1000 # move to next SR |
206 | addis r31, r31, 0x1000 # move to next SR |
218 | 207 | ||
219 | bdnz seg_fill_kernel |
208 | bdnz seg_fill_kernel |
220 | 209 | ||
221 | # invalidate block address translation registers |
210 | # invalidate block address translation registers |
222 | 211 | ||
223 | DEBUG_bat |
- | |
224 | - | ||
225 | li r30, 0 |
212 | li r30, 0 |
226 | 213 | ||
227 | mtspr ibat0u, r30 |
214 | mtspr ibat0u, r30 |
228 | mtspr ibat0l, r30 |
215 | mtspr ibat0l, r30 |
229 | 216 | ||
230 | mtspr ibat1u, r30 |
217 | mtspr ibat1u, r30 |
231 | mtspr ibat1l, r30 |
218 | mtspr ibat1l, r30 |
232 | 219 | ||
233 | mtspr ibat2u, r30 |
220 | mtspr ibat2u, r30 |
234 | mtspr ibat2l, r30 |
221 | mtspr ibat2l, r30 |
235 | 222 | ||
236 | mtspr ibat3u, r30 |
223 | mtspr ibat3u, r30 |
237 | mtspr ibat3l, r30 |
224 | mtspr ibat3l, r30 |
238 | 225 | ||
239 | mtspr dbat0u, r30 |
226 | mtspr dbat0u, r30 |
240 | mtspr dbat0l, r30 |
227 | mtspr dbat0l, r30 |
241 | 228 | ||
242 | mtspr dbat1u, r30 |
229 | mtspr dbat1u, r30 |
243 | mtspr dbat1l, r30 |
230 | mtspr dbat1l, r30 |
244 | 231 | ||
245 | mtspr dbat2u, r30 |
232 | mtspr dbat2u, r30 |
246 | mtspr dbat2l, r30 |
233 | mtspr dbat2l, r30 |
247 | 234 | ||
248 | mtspr dbat3u, r30 |
235 | mtspr dbat3u, r30 |
249 | mtspr dbat3l, r30 |
236 | mtspr dbat3l, r30 |
250 | 237 | ||
251 | # create empty Page Hash Table |
238 | # create empty Page Hash Table |
252 | # on top of memory, size 64 KB |
239 | # on top of memory, size 64 KB |
253 | 240 | ||
254 | DEBUG_pht |
- | |
255 | - | ||
256 | lwz r31, 0(r3) # r31 = memory size |
241 | lwz r31, 0(r3) # r31 = memory size |
257 | 242 | ||
258 | lis r30, 65536@h |
243 | lis r30, 65536@h |
259 | ori r30, r30, 65536@l # r30 = 65536 |
244 | ori r30, r30, 65536@l # r30 = 65536 |
260 | 245 | ||
261 | subi r29, r30, 1 # r29 = 65535 |
246 | subi r29, r30, 1 # r29 = 65535 |
262 | 247 | ||
263 | sub r31, r31, r30 |
248 | sub r31, r31, r30 |
264 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) |
249 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) |
265 | 250 | ||
266 | mtsdr1 r31 |
251 | mtsdr1 r31 |
267 | 252 | ||
268 | li r29, 2 |
253 | li r29, 2 |
269 | srw r30, r30, r29 # r30 = 16384 |
254 | srw r30, r30, r29 # r30 = 16384 |
270 | li r29, 0 |
255 | li r29, 0 |
271 | 256 | ||
272 | pht_clear: |
257 | pht_clear: |
273 | 258 | ||
274 | # write zeroes |
259 | # write zeroes |
275 | 260 | ||
276 | stw r29, 0(r31) |
261 | stw r29, 0(r31) |
277 | 262 | ||
278 | addi r31, r31, 4 |
263 | addi r31, r31, 4 |
279 | subi r30, r30, 4 |
264 | subi r30, r30, 4 |
280 | 265 | ||
281 | cmpwi r30, 0 |
266 | cmpwi r30, 0 |
282 | beq clear_end |
267 | beq clear_end |
283 | 268 | ||
284 | bdnz pht_clear |
269 | bdnz pht_clear |
285 | - | ||
286 | DEBUG_end_pht_clear |
- | |
287 | 270 | ||
288 | clear_end: |
271 | clear_end: |
289 | 272 | ||
290 | #ifdef CONFIG_BAT |
273 | #ifdef CONFIG_BAT |
291 | 274 | ||
292 | # create BAT identity mapping |
275 | # create BAT identity mapping |
293 | 276 | ||
294 | DEBUG_mapping |
- | |
295 | - | ||
296 | lwz r31, 0(r3) # r31 = memory size |
277 | lwz r31, 0(r3) # r31 = memory size |
297 | 278 | ||
298 | lis r29, 0x0002 |
279 | lis r29, 0x0002 |
299 | cmpw r31, r29 |
280 | cmpw r31, r29 |
300 | blt no_bat # less than 128 KB -> no BAT |
281 | blt no_bat # less than 128 KB -> no BAT |
301 | 282 | ||
302 | li r29, 18 |
283 | li r29, 18 |
303 | srw r31, r31, r29 # r31 = total >> 18 |
284 | srw r31, r31, r29 # r31 = total >> 18 |
304 | 285 | ||
305 | # create Block Length mask by replicating |
286 | # create Block Length mask by replicating |
306 | # the leading logical one 14 times |
287 | # the leading logical one 14 times |
307 | 288 | ||
308 | li r29, 14 |
289 | li r29, 14 |
309 | mtctr r31 |
290 | mtctr r31 |
310 | li r29, 1 |
291 | li r29, 1 |
311 | 292 | ||
312 | bat_mask: |
293 | bat_mask: |
313 | srw r30, r31, r29 # r30 = mask >> 1 |
294 | srw r30, r31, r29 # r30 = mask >> 1 |
314 | or r31, r31, r30 # mask = mask | r30 |
295 | or r31, r31, r30 # mask = mask | r30 |
315 | 296 | ||
316 | bdnz bat_mask |
297 | bdnz bat_mask |
317 | 298 | ||
318 | DEBUG_bat_mask |
- | |
319 | - | ||
320 | andi. r31, r31, 0x07ff # mask = mask & 0x07ff (BAT can map up to 256 MB) |
299 | andi. r31, r31, 0x07ff # mask = mask & 0x07ff (BAT can map up to 256 MB) |
321 | 300 | ||
322 | li r29, 2 |
301 | li r29, 2 |
323 | slw r31, r31, r29 # mask = mask << 2 |
302 | slw r31, r31, r29 # mask = mask << 2 |
324 | ori r31, r31, 0x0002 # mask = mask | 0x0002 (priviledged access only) |
303 | ori r31, r31, 0x0002 # mask = mask | 0x0002 (priviledged access only) |
325 | 304 | ||
326 | lis r29, 0x8000 |
305 | lis r29, 0x8000 |
327 | or r29, r29, r31 |
306 | or r29, r29, r31 |
328 | 307 | ||
329 | lis r30, 0x0000 |
308 | lis r30, 0x0000 |
330 | ori r30, r30, 0x0002 |
309 | ori r30, r30, 0x0002 |
331 | 310 | ||
332 | mtspr ibat0u, r29 |
311 | mtspr ibat0u, r29 |
333 | mtspr ibat0l, r30 |
312 | mtspr ibat0l, r30 |
334 | 313 | ||
335 | mtspr dbat0u, r29 |
314 | mtspr dbat0u, r29 |
336 | mtspr dbat0l, r30 |
315 | mtspr dbat0l, r30 |
337 | 316 | ||
338 | no_bat: |
317 | no_bat: |
339 | - | ||
340 | #endif |
- | |
341 | 318 | ||
342 | DEBUG_tlb |
319 | #endif |
343 | 320 | ||
344 | tlbia |
321 | tlbia |
345 | tlbsync |
322 | tlbsync |
346 | 323 | ||
347 | DEBUG_prepare |
- | |
348 | - | ||
349 | # start the kernel |
324 | # start the kernel |
350 | # |
325 | # |
351 | # pc = KERNEL_START_ADDR |
326 | # pc = KERNEL_START_ADDR |
352 | # r3 = bootinfo (pa) |
327 | # r3 = bootinfo (pa) |
353 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
328 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
354 | # sprg3 = physical memory size |
329 | # sprg3 = physical memory size |
355 | # sp = 0 (pa) |
330 | # sp = 0 (pa) |
356 | 331 | ||
357 | lis r31, KERNEL_START_ADDR@ha |
332 | lis r31, KERNEL_START_ADDR@ha |
358 | addi r31, r31, KERNEL_START_ADDR@l |
333 | addi r31, r31, KERNEL_START_ADDR@l |
359 | 334 | ||
360 | mtspr srr0, r31 |
335 | mtspr srr0, r31 |
361 | 336 | ||
362 | subis r31, r31, 0x8000 |
337 | subis r31, r31, 0x8000 |
363 | mtsprg0 r31 |
338 | mtsprg0 r31 |
364 | 339 | ||
365 | lwz r31, 0(r3) |
340 | lwz r31, 0(r3) |
366 | mtsprg3 r31 |
341 | mtsprg3 r31 |
367 | 342 | ||
368 | li sp, 0 |
343 | li sp, 0 |
369 | 344 | ||
370 | mfmsr r31 |
345 | mfmsr r31 |
371 | ori r31, r31, (msr_ir | msr_dr)@l |
346 | ori r31, r31, (msr_ir | msr_dr)@l |
372 | mtspr srr1, r31 |
347 | mtspr srr1, r31 |
373 | 348 | ||
374 | sync |
349 | sync |
375 | isync |
350 | isync |
376 | - | ||
377 | DEBUG_rfi |
- | |
378 | rfi |
351 | rfi |
379 | 352 | ||
380 | .align PAGE_WIDTH |
353 | .align PAGE_WIDTH |
381 | .global trans |
354 | .global trans |
382 | trans: |
355 | trans: |
383 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |
356 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |
384 | 357 |