Commit | Line | Data |
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e9f53129 AM |
1 | /* Overlay manager for SPU. |
2 | ||
45d3b878 | 3 | Copyright 2006, 2007 Free Software Foundation, Inc. |
e9f53129 | 4 | |
f96b4a7b | 5 | This file is part of the GNU Binutils. |
e9f53129 | 6 | |
f96b4a7b | 7 | This program is free software; you can redistribute it and/or modify |
e9f53129 | 8 | it under the terms of the GNU General Public License as published by |
f96b4a7b NC |
9 | the Free Software Foundation; either version 3 of the License, or |
10 | (at your option) any later version. | |
e9f53129 | 11 | |
f96b4a7b | 12 | This program is distributed in the hope that it will be useful, |
e9f53129 AM |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
f96b4a7b NC |
18 | along with this program; if not, write to the Free Software |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
20 | MA 02110-1301, USA. */ | |
e9f53129 | 21 | |
47f6dab9 | 22 | /* MFC DMA defn's. */ |
e9f53129 AM |
23 | #define MFC_GET_CMD 0x40 |
24 | #define MFC_MAX_DMA_SIZE 0x4000 | |
25 | #define MFC_TAG_UPDATE_ALL 2 | |
26 | #define MFC_TAG_ID 0 | |
27 | ||
47f6dab9 AM |
28 | /* Register usage. */ |
29 | #define reserved1 $75 | |
30 | #define parm $75 | |
31 | #define tab1 reserved1 | |
32 | #define tab2 reserved1 | |
33 | #define vma reserved1 | |
34 | #define oldvma reserved1 | |
35 | #define newmask reserved1 | |
36 | #define map reserved1 | |
37 | ||
38 | #define reserved2 $76 | |
39 | #define off1 reserved2 | |
40 | #define off2 reserved2 | |
41 | #define present1 reserved2 | |
42 | #define present2 reserved2 | |
43 | #define sz reserved2 | |
44 | #define cmp reserved2 | |
45 | #define add64 reserved2 | |
46 | #define cgbits reserved2 | |
47 | #define off3 reserved2 | |
48 | #define off4 reserved2 | |
49 | #define off5 reserved2 | |
50 | #define tagstat reserved2 | |
51 | ||
52 | #define reserved3 $77 | |
53 | #define buf1 reserved3 | |
54 | #define buf2 reserved3 | |
55 | #define rv3 reserved3 | |
56 | #define ealo reserved3 | |
57 | #define cmd reserved3 | |
58 | #define off64 reserved3 | |
59 | #define tab3 reserved3 | |
60 | #define tab4 reserved3 | |
61 | #define tab5 reserved3 | |
62 | ||
63 | #define reserved4 $78 | |
64 | #define ovl reserved4 | |
65 | #define rv2 reserved4 | |
66 | #define rv5 reserved4 | |
67 | #define cgshuf reserved4 | |
68 | #define newovl reserved4 | |
69 | ||
70 | #define reserved5 $79 | |
71 | #define target reserved5 | |
72 | ||
73 | #define save1 $72 | |
74 | #define rv4 save1 | |
75 | #define rv7 save1 | |
76 | #define tagid save1 | |
77 | #define maxsize save1 | |
78 | #define pbyte save1 | |
79 | #define pbit save1 | |
80 | ||
81 | #define save2 $73 | |
82 | #define cur save2 | |
83 | #define rv6 save2 | |
84 | #define osize save2 | |
85 | #define zovl save2 | |
86 | #define oldovl save2 | |
87 | #define newvma save2 | |
88 | ||
89 | #define save3 $74 | |
90 | #define rv1 save3 | |
91 | #define ea64 save3 | |
92 | #define buf3 save3 | |
93 | #define genwi save3 | |
94 | #define newmap save3 | |
95 | #define oldmask save3 | |
e9f53129 | 96 | |
c828a49f | 97 | |
e9f53129 | 98 | .text |
47f6dab9 AM |
99 | .align 4 |
100 | .type __rv_pattern, @object | |
101 | .size __rv_pattern, 16 | |
e9f53129 | 102 | __rv_pattern: |
47f6dab9 AM |
103 | .word 0x00010203, 0x10111213, 0x80808080, 0x80808080 |
104 | ||
105 | .type __cg_pattern, @object | |
106 | .size __cg_pattern, 16 | |
e9f53129 | 107 | __cg_pattern: |
47f6dab9 AM |
108 | .word 0x04050607, 0x80808080, 0x80808080, 0x80808080 |
109 | ||
110 | .type __ovly_current, @object | |
111 | .size __ovly_current, 16 | |
112 | __ovly_current: | |
113 | .space 16 | |
e9f53129 | 114 | |
47f6dab9 | 115 | /* |
e9f53129 AM |
116 | * __ovly_return - stub for returning from overlay functions. |
117 | * | |
47f6dab9 AM |
118 | * On entry the four slots of $lr are: |
119 | * __ovly_return, prev ovl index, caller return addr, undefined. | |
e9f53129 | 120 | * |
47f6dab9 AM |
121 | * Load the previous overlay and jump to the caller return address. |
122 | * Updates __ovly_current. | |
e9f53129 | 123 | */ |
47f6dab9 AM |
124 | .align 4 |
125 | .global __ovly_return | |
126 | .type __ovly_return, @function | |
e9f53129 | 127 | __ovly_return: |
47f6dab9 AM |
128 | ila tab1, _ovly_table - 16 # 0,2 0 |
129 | shlqbyi ovl, $lr, 4 # 1,4 0 | |
130 | #nop | |
131 | shlqbyi target, $lr, 8 # 1,4 1 | |
132 | #nop; lnop | |
133 | #nop; lnop | |
134 | shli off1, ovl, 4 # 0,4 4 | |
135 | #lnop | |
136 | #nop | |
137 | hbr ovly_ret9, target # 1,15 5 | |
138 | #nop; lnop | |
139 | #nop; lnop | |
140 | #nop | |
141 | lqx vma, tab1, off1 # 1,6 8 | |
142 | #nop; lnop | |
143 | #nop; lnop | |
144 | #nop; lnop | |
145 | #nop; lnop | |
146 | #nop; lnop | |
147 | #nop | |
148 | rotqbyi buf1, vma, 12 # 1,4 14 | |
149 | #nop | |
150 | stqd save3, -48($sp) # 1,6 15 | |
151 | #nop | |
152 | stqd save2, -32($sp) # 1,6 16 | |
153 | #nop | |
154 | stqd save1, -16($sp) # 1,6 17 | |
155 | andi present1, buf1, 1 # 0,2 18 | |
156 | stqd ovl, (__ovly_current - __ovly_return)($lr) # 1,6 18 | |
157 | #nop; lnop | |
158 | #nop | |
159 | brz present1, __ovly_load_event # 1,4 20 | |
160 | ovly_ret9: | |
161 | #nop | |
162 | bi target # 1,4 21 | |
163 | ||
164 | /* | |
e9f53129 AM |
165 | * __ovly_load - copy an overlay partion to local store. |
166 | * | |
47f6dab9 AM |
167 | * On entry $75 points to a word consisting of the overlay index in |
168 | * the top 14 bits, and the target address in the bottom 18 bits. | |
e9f53129 | 169 | * |
47f6dab9 AM |
170 | * Sets up $lr to return via __ovly_return. |
171 | * Updates __ovly_current. | |
e9f53129 | 172 | */ |
47f6dab9 AM |
173 | .align 3 |
174 | .global __ovly_load | |
175 | .type __ovly_load, @function | |
e9f53129 | 176 | __ovly_load: |
47f6dab9 AM |
177 | #if OVL_STUB_SIZE == 8 |
178 | ######## | |
179 | #nop | |
180 | lqd target, 0(parm) # 1,6 -11 | |
181 | #nop; lnop | |
182 | #nop; lnop | |
183 | #nop; lnop | |
184 | #nop; lnop | |
185 | #nop; lnop | |
186 | #nop | |
187 | rotqby target, target, parm # 1,4 -5 | |
188 | ila tab2, _ovly_table - 16 # 0,2 -4 | |
189 | stqd save3, -48($sp) # 1,6 -4 | |
190 | #nop | |
191 | stqd save2, -32($sp) # 1,6 -3 | |
192 | #nop | |
193 | stqd save1, -16($sp) # 1,6 -2 | |
194 | rotmi ovl, target, -18 # 0,4 -1 | |
195 | hbr ovly_load9, target # 1,15 -1 | |
196 | ila rv1, __ovly_return # 0,2 0 | |
197 | #lnop | |
198 | #nop; lnop | |
199 | #nop | |
200 | lqd cur, (__ovly_current - __ovly_return)(rv1) # 1,6 2 | |
201 | shli off2, ovl, 4 # 0,4 3 | |
202 | stqd ovl, (__ovly_current - __ovly_return)(rv1) # 1,6 3 | |
203 | ceq rv2, $lr, rv1 # 0,2 4 | |
204 | lqd rv3, (__rv_pattern - __ovly_return)(rv1) # 1,6 4 | |
205 | #nop; lnop | |
206 | #nop; lnop | |
207 | #nop | |
208 | lqx vma, tab2, off2 # 1,6 7 | |
209 | ######## | |
210 | #else /* OVL_STUB_SIZE == 16 */ | |
211 | ######## | |
212 | ila tab2, _ovly_table - 16 # 0,2 0 | |
213 | stqd save3, -48($sp) # 1,6 0 | |
214 | ila rv1, __ovly_return # 0,2 1 | |
215 | stqd save2, -32($sp) # 1,6 1 | |
216 | shli off2, ovl, 4 # 0,4 2 | |
217 | lqa cur, __ovly_current # 1,6 2 | |
218 | nop | |
219 | stqa ovl, __ovly_current # 1,6 3 | |
220 | ceq rv2, $lr, rv1 # 0,2 4 | |
221 | lqd rv3, (__rv_pattern - __ovly_return)(rv1) # 1,6 4 | |
222 | #nop | |
223 | hbr ovly_load9, target # 1,15 5 | |
224 | #nop | |
225 | lqx vma, tab2, off2 # 1,6 6 | |
226 | #nop | |
227 | stqd save1, -16($sp) # 1,6 7 | |
228 | ######## | |
c828a49f AM |
229 | #endif |
230 | ||
47f6dab9 AM |
231 | #nop; lnop |
232 | #nop; lnop | |
233 | #nop | |
234 | shufb rv4, rv1, cur, rv3 # 1,4 10 | |
235 | #nop | |
236 | fsmb rv5, rv2 # 1,4 11 | |
237 | #nop | |
238 | rotqmbyi rv6, $lr, -8 # 1,4 12 | |
239 | #nop | |
240 | rotqbyi buf2, vma, 12 # 1,4 13 | |
241 | #nop | |
242 | lqd save3, -48($sp) # 1,6 14 | |
243 | #nop; lnop | |
244 | or rv7, rv4, rv6 # 0,2 16 | |
245 | lqd save2, -32($sp) # 1,6 16 | |
246 | andi present2, buf2, 1 # 0,2 17 | |
247 | lnop # 1,0 17 | |
248 | selb $lr, rv7, $lr, rv5 # 0,2 18 | |
249 | lqd save1, -16($sp) # 1,6 18 | |
250 | #nop | |
251 | brz present2, __ovly_load_event # 1,4 19 | |
252 | ovly_load9: | |
253 | #nop | |
254 | bi target # 1,4 20 | |
255 | ||
256 | /* If we get here, we are about to load a new overlay. | |
257 | * "vma" contains the relevant entry from _ovly_table[]. | |
e9f53129 AM |
258 | * extern struct { |
259 | * u32 vma; | |
260 | * u32 size; | |
261 | * u32 file_offset; | |
262 | * u32 buf; | |
263 | * } _ovly_table[]; | |
264 | */ | |
47f6dab9 AM |
265 | .align 3 |
266 | .global __ovly_load_event | |
267 | .type __ovly_load_event, @function | |
b1e37473 | 268 | __ovly_load_event: |
47f6dab9 AM |
269 | #nop |
270 | rotqbyi sz, vma, 8 # 1,4 0 | |
271 | #nop | |
272 | rotqbyi osize, vma, 4 # 1,4 1 | |
273 | #nop | |
274 | lqa ea64, _EAR_ # 1,6 2 | |
275 | #nop | |
276 | lqd cgshuf, (__cg_pattern - __ovly_return)($lr) # 1,6 3 | |
277 | ||
278 | /* We could predict the branch at the end of this loop by adding a few | |
279 | instructions, and there are plenty of free cycles to do so without | |
280 | impacting loop execution time. However, it doesn't make a great | |
281 | deal of sense since we need to wait for the dma to complete anyway. */ | |
e9f53129 | 282 | __ovly_xfer_loop: |
47f6dab9 AM |
283 | #nop |
284 | rotqmbyi off64, sz, -4 # 1,4 4 | |
285 | #nop; lnop | |
286 | #nop; lnop | |
287 | #nop; lnop | |
288 | cg cgbits, ea64, off64 # 0,2 8 | |
289 | #lnop | |
290 | #nop; lnop | |
291 | #nop | |
292 | shufb add64, cgbits, cgbits, cgshuf # 1,4 10 | |
293 | #nop; lnop | |
294 | #nop; lnop | |
295 | #nop; lnop | |
296 | addx add64, ea64, off64 # 0,2 14 | |
297 | #lnop | |
298 | ila maxsize, MFC_MAX_DMA_SIZE # 0,2 15 | |
299 | lnop | |
300 | ori ea64, add64, 0 # 0,2 16 | |
301 | rotqbyi ealo, add64, 4 # 1,4 16 | |
302 | cgt cmp, osize, maxsize # 0,2 17 | |
303 | wrch $MFC_LSA, vma # 1,6 17 | |
304 | #nop; lnop | |
305 | selb sz, osize, maxsize, cmp # 0,2 19 | |
306 | wrch $MFC_EAH, ea64 # 1,6 19 | |
307 | ila tagid, MFC_TAG_ID # 0,2 20 | |
308 | wrch $MFC_EAL, ealo # 1,6 20 | |
309 | ila cmd, MFC_GET_CMD # 0,2 21 | |
310 | wrch $MFC_Size, sz # 1,6 21 | |
311 | sf osize, sz, osize # 0,2 22 | |
312 | wrch $MFC_TagId, tagid # 1,6 22 | |
313 | a vma, vma, sz # 0,2 23 | |
314 | wrch $MFC_Cmd, cmd # 1,6 23 | |
315 | #nop | |
316 | brnz osize, __ovly_xfer_loop # 1,4 24 | |
317 | ||
318 | /* Now update our data structions while waiting for DMA to complete. | |
319 | Low bit of .buf needs to be cleared on the _ovly_table entry | |
320 | corresponding to the evicted overlay, and set on the entry for the | |
321 | newly loaded overlay. Note that no overlay may in fact be evicted | |
322 | as _ovly_buf_table[] starts with all zeros. Don't zap .buf entry | |
323 | for zero index! Also of course update the _ovly_buf_table entry. */ | |
324 | #nop | |
325 | lqd newovl, (__ovly_current - __ovly_return)($lr) # 1,6 25 | |
326 | #nop; lnop | |
327 | #nop; lnop | |
328 | #nop; lnop | |
329 | #nop; lnop | |
330 | #nop; lnop | |
331 | shli off3, newovl, 4 # 0,4 31 | |
332 | #lnop | |
333 | ila tab3, _ovly_table - 16 # 0,2 32 | |
334 | #lnop | |
335 | #nop | |
336 | fsmbi pbyte, 1 # 1,4 33 | |
337 | #nop; lnop | |
338 | #nop | |
339 | lqx vma, tab3, off3 # 1,6 35 | |
340 | #nop; lnop | |
341 | andi pbit, pbyte, 1 # 0,2 37 | |
342 | lnop | |
343 | #nop; lnop | |
344 | #nop; lnop | |
345 | #nop; lnop | |
346 | or newvma, vma, pbit # 0,2 41 | |
347 | rotqbyi buf3, vma, 12 # 1,4 41 | |
348 | #nop; lnop | |
349 | #nop | |
350 | stqx newvma, tab3, off3 # 1,6 43 | |
351 | #nop; lnop | |
352 | shli off4, buf3, 2 # 1,4 45 | |
353 | #lnop | |
354 | ila tab4, _ovly_buf_table # 0,2 46 | |
355 | #lnop | |
356 | #nop; lnop | |
357 | #nop; lnop | |
358 | #nop | |
359 | lqx map, tab4, off4 # 1,6 49 | |
360 | #nop | |
361 | cwx genwi, tab4, off4 # 1,4 50 | |
362 | #nop; lnop | |
363 | #nop; lnop | |
364 | #nop; lnop | |
365 | #nop; lnop | |
366 | #nop | |
367 | rotqby oldovl, map, off4 # 1,4 55 | |
368 | nop | |
369 | shufb newmap, newovl, map, genwi # 0,4 56 | |
e9f53129 | 370 | #if MFC_TAG_ID < 16 |
47f6dab9 | 371 | ila newmask, 1 << MFC_TAG_ID # 0,2 57 |
e9f53129 | 372 | #else |
47f6dab9 | 373 | ilhu newmask, 1 << (MFC_TAG_ID - 16) # 0,2 57 |
c828a49f | 374 | #endif |
47f6dab9 AM |
375 | #lnop |
376 | #nop; lnop | |
377 | #nop; lnop | |
378 | stqx newmap, tab4, off4 # 1,6 60 | |
379 | ||
380 | /* Save app's tagmask, wait for DMA complete, restore mask. */ | |
381 | ila tagstat, MFC_TAG_UPDATE_ALL # 0,2 61 | |
382 | rdch oldmask, $MFC_RdTagMask # 1,6 61 | |
383 | #nop | |
384 | wrch $MFC_WrTagMask, newmask # 1,6 62 | |
385 | #nop | |
386 | wrch $MFC_WrTagUpdate, tagstat # 1,6 63 | |
387 | #nop | |
388 | rdch tagstat, $MFC_RdTagStat # 1,6 64 | |
389 | #nop | |
390 | sync # 1,4 65 | |
391 | /* Any hint prior to the sync is lost. A hint here allows the branch | |
392 | to complete 15 cycles after the hint. With no hint the branch will | |
393 | take 18 or 19 cycles. */ | |
394 | ila tab5, _ovly_table - 16 # 0,2 66 | |
395 | hbr do_load99, target # 1,15 66 | |
396 | shli off5, oldovl, 4 # 0,4 67 | |
397 | wrch $MFC_WrTagMask, oldmask # 1,6 67 | |
398 | ceqi zovl, oldovl, 0 # 0,2 68 | |
399 | #lnop | |
400 | #nop; lnop | |
401 | #nop | |
402 | fsm zovl, zovl # 1,4 70 | |
403 | #nop | |
404 | lqx oldvma, tab5, off5 # 1,6 71 | |
405 | #nop | |
406 | lqd save3, -48($sp) # 1,6 72 | |
407 | #nop; lnop | |
408 | andc pbit, pbit, zovl # 0,2 74 | |
409 | lqd save2, -32($sp) # 1,6 74 | |
410 | #nop; lnop | |
411 | #nop; lnop | |
412 | andc oldvma, oldvma, pbit # 0,2 77 | |
413 | lqd save1, -16($sp) # 1,6 77 | |
414 | #nop; lnop | |
415 | nop | |
416 | stqx oldvma, tab5, off5 # 1,6 79 | |
417 | #nop; lnop | |
c828a49f | 418 | |
47f6dab9 AM |
419 | .global _ovly_debug_event |
420 | .type _ovly_debug_event, @function | |
e9f53129 | 421 | _ovly_debug_event: |
e9f53129 | 422 | nop |
e9f53129 | 423 | /* Branch to target address. */ |
47f6dab9 AM |
424 | do_load99: |
425 | bi target # 1,4 81 | |
b1e37473 | 426 | |
47f6dab9 | 427 | .size __ovly_load, . - __ovly_load |