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cf683fed | 1 | /** @file\r |
2 | GCC inline implementation of BaseLib processor specific functions.\r | |
9095d37b | 3 | \r |
d3c9e40a | 4 | Copyright (c) 2006 - 2020, Intel Corporation. All rights reserved.<BR>\r |
c9b34b8c | 5 | Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r |
9344f092 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
cf683fed | 7 | \r |
8 | **/\r | |
9 | \r | |
10 | \r | |
11 | #include "BaseLibInternals.h"\r | |
12 | \r | |
cf683fed | 13 | /**\r |
d3c9e40a | 14 | Used to serialize load and store operations.\r |
cf683fed | 15 | \r |
d3c9e40a MK |
16 | All loads and stores that proceed calls to this function are guaranteed to be\r |
17 | globally visible when this function returns.\r | |
cf683fed | 18 | \r |
19 | **/\r | |
20 | VOID\r | |
21 | EFIAPI\r | |
d3c9e40a MK |
22 | MemoryFence (\r |
23 | VOID\r | |
cf683fed | 24 | )\r |
25 | {\r | |
d3c9e40a MK |
26 | // This is a little bit of overkill and it is more about the compiler that it is\r |
27 | // actually processor synchronization. This is like the _ReadWriteBarrier\r | |
28 | // Microsoft specific intrinsic\r | |
29 | __asm__ __volatile__ ("":::"memory");\r | |
cf683fed | 30 | }\r |
31 | \r | |
cf683fed | 32 | /**\r |
d3c9e40a | 33 | Requests CPU to pause for a short period of time.\r |
cf683fed | 34 | \r |
d3c9e40a MK |
35 | Requests CPU to pause for a short period of time. Typically used in MP\r |
36 | systems to prevent memory starvation while waiting for a spin lock.\r | |
cf683fed | 37 | \r |
38 | **/\r | |
39 | VOID\r | |
40 | EFIAPI\r | |
d3c9e40a MK |
41 | CpuPause (\r |
42 | VOID\r | |
cf683fed | 43 | )\r |
44 | {\r | |
d3c9e40a | 45 | __asm__ __volatile__ ("pause");\r |
cf683fed | 46 | }\r |
47 | \r | |
cf683fed | 48 | /**\r |
d3c9e40a | 49 | Generates a breakpoint on the CPU.\r |
cf683fed | 50 | \r |
d3c9e40a MK |
51 | Generates a breakpoint on the CPU. The breakpoint must be implemented such\r |
52 | that code can resume normal execution after the breakpoint.\r | |
cf683fed | 53 | \r |
54 | **/\r | |
55 | VOID\r | |
56 | EFIAPI\r | |
d3c9e40a MK |
57 | CpuBreakpoint (\r |
58 | VOID\r | |
cf683fed | 59 | )\r |
60 | {\r | |
d3c9e40a | 61 | __asm__ __volatile__ ("int $3");\r |
cf683fed | 62 | }\r |
63 | \r | |
cf683fed | 64 | /**\r |
d3c9e40a | 65 | Reads the current value of the EFLAGS register.\r |
cf683fed | 66 | \r |
d3c9e40a MK |
67 | Reads and returns the current value of the EFLAGS register. This function is\r |
68 | only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a\r | |
69 | 64-bit value on X64.\r | |
cf683fed | 70 | \r |
d3c9e40a | 71 | @return EFLAGS on IA-32 or RFLAGS on X64.\r |
cf683fed | 72 | \r |
73 | **/\r | |
d3c9e40a | 74 | UINTN\r |
cf683fed | 75 | EFIAPI\r |
d3c9e40a | 76 | AsmReadEflags (\r |
cf683fed | 77 | VOID\r |
78 | )\r | |
79 | {\r | |
d3c9e40a | 80 | UINTN Eflags;\r |
9095d37b | 81 | \r |
cf683fed | 82 | __asm__ __volatile__ (\r |
d3c9e40a MK |
83 | "pushfl \n\t"\r |
84 | "popl %0 "\r | |
85 | : "=r" (Eflags)\r | |
cf683fed | 86 | );\r |
9095d37b | 87 | \r |
d3c9e40a | 88 | return Eflags;\r |
cf683fed | 89 | }\r |
90 | \r | |
cf683fed | 91 | /**\r |
92 | Save the current floating point/SSE/SSE2 context to a buffer.\r | |
93 | \r | |
94 | Saves the current floating point/SSE/SSE2 state to the buffer specified by\r | |
95 | Buffer. Buffer must be aligned on a 16-byte boundary. This function is only\r | |
96 | available on IA-32 and X64.\r | |
97 | \r | |
2fc59a00 | 98 | @param Buffer The pointer to a buffer to save the floating point/SSE/SSE2 context.\r |
cf683fed | 99 | \r |
100 | **/\r | |
101 | VOID\r | |
102 | EFIAPI\r | |
103 | InternalX86FxSave (\r | |
104 | OUT IA32_FX_BUFFER *Buffer\r | |
105 | )\r | |
106 | {\r | |
107 | __asm__ __volatile__ (\r | |
108 | "fxsave %0"\r | |
109 | :\r | |
110 | : "m" (*Buffer) // %0\r | |
9095d37b | 111 | );\r |
cf683fed | 112 | }\r |
113 | \r | |
114 | \r | |
115 | /**\r | |
116 | Restores the current floating point/SSE/SSE2 context from a buffer.\r | |
117 | \r | |
118 | Restores the current floating point/SSE/SSE2 state from the buffer specified\r | |
119 | by Buffer. Buffer must be aligned on a 16-byte boundary. This function is\r | |
120 | only available on IA-32 and X64.\r | |
121 | \r | |
2fc59a00 | 122 | @param Buffer The pointer to a buffer to save the floating point/SSE/SSE2 context.\r |
cf683fed | 123 | \r |
124 | **/\r | |
125 | VOID\r | |
126 | EFIAPI\r | |
127 | InternalX86FxRestore (\r | |
128 | IN CONST IA32_FX_BUFFER *Buffer\r | |
129 | )\r | |
130 | {\r | |
131 | __asm__ __volatile__ (\r | |
132 | "fxrstor %0"\r | |
133 | :\r | |
134 | : "m" (*Buffer) // %0\r | |
135 | );\r | |
136 | }\r | |
137 | \r | |
138 | \r | |
139 | /**\r | |
140 | Reads the current value of 64-bit MMX Register #0 (MM0).\r | |
141 | \r | |
142 | Reads and returns the current value of MM0. This function is only available\r | |
143 | on IA-32 and X64.\r | |
144 | \r | |
145 | @return The current value of MM0.\r | |
146 | \r | |
147 | **/\r | |
148 | UINT64\r | |
149 | EFIAPI\r | |
150 | AsmReadMm0 (\r | |
151 | VOID\r | |
152 | )\r | |
153 | {\r | |
154 | UINT64 Data;\r | |
155 | \r | |
156 | __asm__ __volatile__ (\r | |
157 | "push %%eax \n\t"\r | |
158 | "push %%eax \n\t"\r | |
159 | "movq %%mm0, (%%esp)\n\t"\r | |
160 | "pop %%eax \n\t"\r | |
161 | "pop %%edx \n\t"\r | |
162 | : "=A" (Data) // %0\r | |
163 | );\r | |
9095d37b | 164 | \r |
cf683fed | 165 | return Data;\r |
166 | }\r | |
167 | \r | |
168 | \r | |
169 | /**\r | |
170 | Reads the current value of 64-bit MMX Register #1 (MM1).\r | |
171 | \r | |
172 | Reads and returns the current value of MM1. This function is only available\r | |
173 | on IA-32 and X64.\r | |
174 | \r | |
175 | @return The current value of MM1.\r | |
176 | \r | |
177 | **/\r | |
178 | UINT64\r | |
179 | EFIAPI\r | |
180 | AsmReadMm1 (\r | |
181 | VOID\r | |
182 | )\r | |
183 | {\r | |
184 | UINT64 Data;\r | |
185 | \r | |
186 | __asm__ __volatile__ (\r | |
187 | "push %%eax \n\t"\r | |
188 | "push %%eax \n\t"\r | |
189 | "movq %%mm1, (%%esp)\n\t"\r | |
190 | "pop %%eax \n\t"\r | |
191 | "pop %%edx \n\t"\r | |
192 | : "=A" (Data) // %0\r | |
193 | );\r | |
9095d37b | 194 | \r |
cf683fed | 195 | return Data;\r |
196 | }\r | |
197 | \r | |
198 | \r | |
199 | /**\r | |
200 | Reads the current value of 64-bit MMX Register #2 (MM2).\r | |
201 | \r | |
202 | Reads and returns the current value of MM2. This function is only available\r | |
203 | on IA-32 and X64.\r | |
204 | \r | |
205 | @return The current value of MM2.\r | |
206 | \r | |
207 | **/\r | |
208 | UINT64\r | |
209 | EFIAPI\r | |
210 | AsmReadMm2 (\r | |
211 | VOID\r | |
212 | )\r | |
213 | {\r | |
214 | UINT64 Data;\r | |
215 | \r | |
216 | __asm__ __volatile__ (\r | |
217 | "push %%eax \n\t"\r | |
218 | "push %%eax \n\t"\r | |
219 | "movq %%mm2, (%%esp)\n\t"\r | |
220 | "pop %%eax \n\t"\r | |
221 | "pop %%edx \n\t"\r | |
222 | : "=A" (Data) // %0\r | |
223 | );\r | |
9095d37b | 224 | \r |
cf683fed | 225 | return Data;\r |
226 | }\r | |
227 | \r | |
228 | \r | |
229 | /**\r | |
230 | Reads the current value of 64-bit MMX Register #3 (MM3).\r | |
231 | \r | |
232 | Reads and returns the current value of MM3. This function is only available\r | |
233 | on IA-32 and X64.\r | |
234 | \r | |
235 | @return The current value of MM3.\r | |
236 | \r | |
237 | **/\r | |
238 | UINT64\r | |
239 | EFIAPI\r | |
240 | AsmReadMm3 (\r | |
241 | VOID\r | |
242 | )\r | |
243 | {\r | |
244 | UINT64 Data;\r | |
245 | \r | |
246 | __asm__ __volatile__ (\r | |
247 | "push %%eax \n\t"\r | |
248 | "push %%eax \n\t"\r | |
249 | "movq %%mm3, (%%esp)\n\t"\r | |
250 | "pop %%eax \n\t"\r | |
251 | "pop %%edx \n\t"\r | |
252 | : "=A" (Data) // %0\r | |
253 | );\r | |
9095d37b | 254 | \r |
cf683fed | 255 | return Data;\r |
256 | }\r | |
257 | \r | |
258 | \r | |
259 | /**\r | |
260 | Reads the current value of 64-bit MMX Register #4 (MM4).\r | |
261 | \r | |
262 | Reads and returns the current value of MM4. This function is only available\r | |
263 | on IA-32 and X64.\r | |
264 | \r | |
265 | @return The current value of MM4.\r | |
266 | \r | |
267 | **/\r | |
268 | UINT64\r | |
269 | EFIAPI\r | |
270 | AsmReadMm4 (\r | |
271 | VOID\r | |
272 | )\r | |
273 | {\r | |
274 | UINT64 Data;\r | |
275 | \r | |
276 | __asm__ __volatile__ (\r | |
277 | "push %%eax \n\t"\r | |
278 | "push %%eax \n\t"\r | |
279 | "movq %%mm4, (%%esp)\n\t"\r | |
280 | "pop %%eax \n\t"\r | |
281 | "pop %%edx \n\t"\r | |
282 | : "=A" (Data) // %0\r | |
283 | );\r | |
9095d37b | 284 | \r |
cf683fed | 285 | return Data;\r |
286 | }\r | |
287 | \r | |
288 | \r | |
289 | /**\r | |
290 | Reads the current value of 64-bit MMX Register #5 (MM5).\r | |
291 | \r | |
292 | Reads and returns the current value of MM5. This function is only available\r | |
293 | on IA-32 and X64.\r | |
294 | \r | |
295 | @return The current value of MM5.\r | |
296 | \r | |
297 | **/\r | |
298 | UINT64\r | |
299 | EFIAPI\r | |
300 | AsmReadMm5 (\r | |
301 | VOID\r | |
302 | )\r | |
303 | {\r | |
304 | UINT64 Data;\r | |
305 | \r | |
306 | __asm__ __volatile__ (\r | |
307 | "push %%eax \n\t"\r | |
308 | "push %%eax \n\t"\r | |
309 | "movq %%mm5, (%%esp)\n\t"\r | |
310 | "pop %%eax \n\t"\r | |
311 | "pop %%edx \n\t"\r | |
312 | : "=A" (Data) // %0\r | |
313 | );\r | |
9095d37b | 314 | \r |
cf683fed | 315 | return Data;\r |
316 | }\r | |
317 | \r | |
318 | \r | |
319 | /**\r | |
320 | Reads the current value of 64-bit MMX Register #6 (MM6).\r | |
321 | \r | |
322 | Reads and returns the current value of MM6. This function is only available\r | |
323 | on IA-32 and X64.\r | |
324 | \r | |
325 | @return The current value of MM6.\r | |
326 | \r | |
327 | **/\r | |
328 | UINT64\r | |
329 | EFIAPI\r | |
330 | AsmReadMm6 (\r | |
331 | VOID\r | |
332 | )\r | |
333 | {\r | |
334 | UINT64 Data;\r | |
335 | \r | |
336 | __asm__ __volatile__ (\r | |
337 | "push %%eax \n\t"\r | |
338 | "push %%eax \n\t"\r | |
339 | "movq %%mm6, (%%esp)\n\t"\r | |
340 | "pop %%eax \n\t"\r | |
341 | "pop %%edx \n\t"\r | |
342 | : "=A" (Data) // %0\r | |
343 | );\r | |
9095d37b | 344 | \r |
cf683fed | 345 | return Data;\r |
346 | }\r | |
347 | \r | |
348 | \r | |
349 | /**\r | |
350 | Reads the current value of 64-bit MMX Register #7 (MM7).\r | |
351 | \r | |
352 | Reads and returns the current value of MM7. This function is only available\r | |
353 | on IA-32 and X64.\r | |
354 | \r | |
355 | @return The current value of MM7.\r | |
356 | \r | |
357 | **/\r | |
358 | UINT64\r | |
359 | EFIAPI\r | |
360 | AsmReadMm7 (\r | |
361 | VOID\r | |
362 | )\r | |
363 | {\r | |
364 | UINT64 Data;\r | |
365 | \r | |
366 | __asm__ __volatile__ (\r | |
367 | "push %%eax \n\t"\r | |
368 | "push %%eax \n\t"\r | |
369 | "movq %%mm7, (%%esp)\n\t"\r | |
370 | "pop %%eax \n\t"\r | |
371 | "pop %%edx \n\t"\r | |
372 | : "=A" (Data) // %0\r | |
373 | );\r | |
9095d37b | 374 | \r |
cf683fed | 375 | return Data;\r |
376 | }\r | |
377 | \r | |
378 | \r | |
379 | /**\r | |
380 | Writes the current value of 64-bit MMX Register #0 (MM0).\r | |
381 | \r | |
382 | Writes the current value of MM0. This function is only available on IA32 and\r | |
383 | X64.\r | |
384 | \r | |
385 | @param Value The 64-bit value to write to MM0.\r | |
386 | \r | |
387 | **/\r | |
388 | VOID\r | |
389 | EFIAPI\r | |
390 | AsmWriteMm0 (\r | |
391 | IN UINT64 Value\r | |
392 | )\r | |
393 | {\r | |
394 | __asm__ __volatile__ (\r | |
395 | "movq %0, %%mm0" // %0\r | |
9095d37b | 396 | :\r |
cf683fed | 397 | : "m" (Value)\r |
398 | );\r | |
399 | }\r | |
400 | \r | |
401 | \r | |
402 | /**\r | |
403 | Writes the current value of 64-bit MMX Register #1 (MM1).\r | |
404 | \r | |
405 | Writes the current value of MM1. This function is only available on IA32 and\r | |
406 | X64.\r | |
407 | \r | |
408 | @param Value The 64-bit value to write to MM1.\r | |
409 | \r | |
410 | **/\r | |
411 | VOID\r | |
412 | EFIAPI\r | |
413 | AsmWriteMm1 (\r | |
414 | IN UINT64 Value\r | |
415 | )\r | |
416 | {\r | |
417 | __asm__ __volatile__ (\r | |
418 | "movq %0, %%mm1" // %0\r | |
9095d37b | 419 | :\r |
cf683fed | 420 | : "m" (Value)\r |
421 | );\r | |
422 | }\r | |
423 | \r | |
424 | \r | |
425 | /**\r | |
426 | Writes the current value of 64-bit MMX Register #2 (MM2).\r | |
427 | \r | |
428 | Writes the current value of MM2. This function is only available on IA32 and\r | |
429 | X64.\r | |
430 | \r | |
431 | @param Value The 64-bit value to write to MM2.\r | |
432 | \r | |
433 | **/\r | |
434 | VOID\r | |
435 | EFIAPI\r | |
436 | AsmWriteMm2 (\r | |
437 | IN UINT64 Value\r | |
438 | )\r | |
439 | {\r | |
440 | __asm__ __volatile__ (\r | |
441 | "movq %0, %%mm2" // %0\r | |
9095d37b | 442 | :\r |
cf683fed | 443 | : "m" (Value)\r |
444 | );\r | |
445 | }\r | |
446 | \r | |
447 | \r | |
448 | /**\r | |
449 | Writes the current value of 64-bit MMX Register #3 (MM3).\r | |
450 | \r | |
451 | Writes the current value of MM3. This function is only available on IA32 and\r | |
452 | X64.\r | |
453 | \r | |
454 | @param Value The 64-bit value to write to MM3.\r | |
455 | \r | |
456 | **/\r | |
457 | VOID\r | |
458 | EFIAPI\r | |
459 | AsmWriteMm3 (\r | |
460 | IN UINT64 Value\r | |
461 | )\r | |
462 | {\r | |
463 | __asm__ __volatile__ (\r | |
464 | "movq %0, %%mm3" // %0\r | |
9095d37b | 465 | :\r |
cf683fed | 466 | : "m" (Value)\r |
467 | );\r | |
468 | }\r | |
469 | \r | |
470 | \r | |
471 | /**\r | |
472 | Writes the current value of 64-bit MMX Register #4 (MM4).\r | |
473 | \r | |
474 | Writes the current value of MM4. This function is only available on IA32 and\r | |
475 | X64.\r | |
476 | \r | |
477 | @param Value The 64-bit value to write to MM4.\r | |
478 | \r | |
479 | **/\r | |
480 | VOID\r | |
481 | EFIAPI\r | |
482 | AsmWriteMm4 (\r | |
483 | IN UINT64 Value\r | |
484 | )\r | |
485 | {\r | |
486 | __asm__ __volatile__ (\r | |
487 | "movq %0, %%mm4" // %0\r | |
9095d37b | 488 | :\r |
cf683fed | 489 | : "m" (Value)\r |
490 | );\r | |
491 | }\r | |
492 | \r | |
493 | \r | |
494 | /**\r | |
495 | Writes the current value of 64-bit MMX Register #5 (MM5).\r | |
496 | \r | |
497 | Writes the current value of MM5. This function is only available on IA32 and\r | |
498 | X64.\r | |
499 | \r | |
500 | @param Value The 64-bit value to write to MM5.\r | |
501 | \r | |
502 | **/\r | |
503 | VOID\r | |
504 | EFIAPI\r | |
505 | AsmWriteMm5 (\r | |
506 | IN UINT64 Value\r | |
507 | )\r | |
508 | {\r | |
509 | __asm__ __volatile__ (\r | |
510 | "movq %0, %%mm5" // %0\r | |
9095d37b | 511 | :\r |
cf683fed | 512 | : "m" (Value)\r |
513 | );\r | |
514 | }\r | |
515 | \r | |
516 | \r | |
517 | /**\r | |
518 | Writes the current value of 64-bit MMX Register #6 (MM6).\r | |
519 | \r | |
520 | Writes the current value of MM6. This function is only available on IA32 and\r | |
521 | X64.\r | |
522 | \r | |
523 | @param Value The 64-bit value to write to MM6.\r | |
524 | \r | |
525 | **/\r | |
526 | VOID\r | |
527 | EFIAPI\r | |
528 | AsmWriteMm6 (\r | |
529 | IN UINT64 Value\r | |
530 | )\r | |
531 | {\r | |
532 | __asm__ __volatile__ (\r | |
533 | "movq %0, %%mm6" // %0\r | |
9095d37b | 534 | :\r |
cf683fed | 535 | : "m" (Value)\r |
536 | );\r | |
537 | }\r | |
538 | \r | |
539 | \r | |
540 | /**\r | |
541 | Writes the current value of 64-bit MMX Register #7 (MM7).\r | |
542 | \r | |
543 | Writes the current value of MM7. This function is only available on IA32 and\r | |
544 | X64.\r | |
545 | \r | |
546 | @param Value The 64-bit value to write to MM7.\r | |
547 | \r | |
548 | **/\r | |
549 | VOID\r | |
550 | EFIAPI\r | |
551 | AsmWriteMm7 (\r | |
552 | IN UINT64 Value\r | |
553 | )\r | |
554 | {\r | |
555 | __asm__ __volatile__ (\r | |
556 | "movq %0, %%mm7" // %0\r | |
9095d37b | 557 | :\r |
cf683fed | 558 | : "m" (Value)\r |
559 | );\r | |
560 | }\r | |
561 | \r | |
562 | \r | |
563 | /**\r | |
564 | Reads the current value of Time Stamp Counter (TSC).\r | |
565 | \r | |
566 | Reads and returns the current value of TSC. This function is only available\r | |
567 | on IA-32 and X64.\r | |
568 | \r | |
569 | @return The current value of TSC\r | |
570 | \r | |
571 | **/\r | |
572 | UINT64\r | |
573 | EFIAPI\r | |
574 | AsmReadTsc (\r | |
575 | VOID\r | |
576 | )\r | |
577 | {\r | |
578 | UINT64 Data;\r | |
9095d37b | 579 | \r |
cf683fed | 580 | __asm__ __volatile__ (\r |
581 | "rdtsc"\r | |
582 | : "=A" (Data)\r | |
583 | );\r | |
9095d37b LG |
584 | \r |
585 | return Data;\r | |
cf683fed | 586 | }\r |