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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 |
9095d37b | 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 | |
13 | \r | |
14 | \r | |
15 | \r | |
16 | /**\r | |
17 | Used to serialize load and store operations.\r | |
18 | \r | |
19 | All loads and stores that proceed calls to this function are guaranteed to be\r | |
20 | globally visible when this function returns.\r | |
21 | \r | |
22 | **/\r | |
23 | VOID\r | |
24 | EFIAPI\r | |
25 | MemoryFence (\r | |
26 | VOID\r | |
27 | )\r | |
28 | {\r | |
29 | // This is a little bit of overkill and it is more about the compiler that it is\r | |
9095d37b | 30 | // actually processor synchronization. This is like the _ReadWriteBarrier\r |
d01a90fb | 31 | // Microsoft specific intrinsic\r |
cf683fed | 32 | __asm__ __volatile__ ("":::"memory");\r |
33 | }\r | |
34 | \r | |
35 | \r | |
36 | /**\r | |
d3c9e40a | 37 | Requests CPU to pause for a short period of time.\r |
cf683fed | 38 | \r |
d3c9e40a MK |
39 | Requests CPU to pause for a short period of time. Typically used in MP\r |
40 | systems to prevent memory starvation while waiting for a spin lock.\r | |
cf683fed | 41 | \r |
42 | **/\r | |
43 | VOID\r | |
44 | EFIAPI\r | |
d3c9e40a MK |
45 | CpuPause (\r |
46 | VOID\r | |
cf683fed | 47 | )\r |
48 | {\r | |
d3c9e40a | 49 | __asm__ __volatile__ ("pause");\r |
cf683fed | 50 | }\r |
51 | \r | |
52 | \r | |
53 | /**\r | |
d3c9e40a | 54 | Generates a breakpoint on the CPU.\r |
cf683fed | 55 | \r |
d3c9e40a MK |
56 | Generates a breakpoint on the CPU. The breakpoint must be implemented such\r |
57 | that code can resume normal execution after the breakpoint.\r | |
cf683fed | 58 | \r |
59 | **/\r | |
60 | VOID\r | |
61 | EFIAPI\r | |
d3c9e40a MK |
62 | CpuBreakpoint (\r |
63 | VOID\r | |
cf683fed | 64 | )\r |
65 | {\r | |
d3c9e40a | 66 | __asm__ __volatile__ ("int $3");\r |
cf683fed | 67 | }\r |
68 | \r | |
69 | \r | |
70 | /**\r | |
d3c9e40a | 71 | Reads the current value of the EFLAGS register.\r |
cf683fed | 72 | \r |
d3c9e40a MK |
73 | Reads and returns the current value of the EFLAGS register. This function is\r |
74 | only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a\r | |
75 | 64-bit value on X64.\r | |
cf683fed | 76 | \r |
d3c9e40a | 77 | @return EFLAGS on IA-32 or RFLAGS on X64.\r |
cf683fed | 78 | \r |
79 | **/\r | |
d3c9e40a | 80 | UINTN\r |
cf683fed | 81 | EFIAPI\r |
d3c9e40a | 82 | AsmReadEflags (\r |
cf683fed | 83 | VOID\r |
84 | )\r | |
85 | {\r | |
d3c9e40a | 86 | UINTN Eflags;\r |
9095d37b | 87 | \r |
cf683fed | 88 | __asm__ __volatile__ (\r |
d3c9e40a MK |
89 | "pushfq \n\t"\r |
90 | "pop %0 "\r | |
91 | : "=r" (Eflags) // %0\r | |
cf683fed | 92 | );\r |
9095d37b | 93 | \r |
d3c9e40a | 94 | return Eflags;\r |
cf683fed | 95 | }\r |
96 | \r | |
cf683fed | 97 | /**\r |
98 | Save the current floating point/SSE/SSE2 context to a buffer.\r | |
99 | \r | |
100 | Saves the current floating point/SSE/SSE2 state to the buffer specified by\r | |
101 | Buffer. Buffer must be aligned on a 16-byte boundary. This function is only\r | |
102 | available on IA-32 and X64.\r | |
103 | \r | |
2fc59a00 | 104 | @param Buffer The pointer to a buffer to save the floating point/SSE/SSE2 context.\r |
cf683fed | 105 | \r |
106 | **/\r | |
107 | VOID\r | |
108 | EFIAPI\r | |
109 | InternalX86FxSave (\r | |
110 | OUT IA32_FX_BUFFER *Buffer\r | |
111 | )\r | |
112 | {\r | |
113 | __asm__ __volatile__ (\r | |
114 | "fxsave %0"\r | |
115 | :\r | |
116 | : "m" (*Buffer) // %0\r | |
9095d37b | 117 | );\r |
cf683fed | 118 | }\r |
119 | \r | |
120 | \r | |
121 | /**\r | |
122 | Restores the current floating point/SSE/SSE2 context from a buffer.\r | |
123 | \r | |
124 | Restores the current floating point/SSE/SSE2 state from the buffer specified\r | |
125 | by Buffer. Buffer must be aligned on a 16-byte boundary. This function is\r | |
126 | only available on IA-32 and X64.\r | |
127 | \r | |
2fc59a00 | 128 | @param Buffer The pointer to a buffer to save the floating point/SSE/SSE2 context.\r |
cf683fed | 129 | \r |
130 | **/\r | |
131 | VOID\r | |
132 | EFIAPI\r | |
133 | InternalX86FxRestore (\r | |
134 | IN CONST IA32_FX_BUFFER *Buffer\r | |
135 | )\r | |
136 | {\r | |
137 | __asm__ __volatile__ (\r | |
138 | "fxrstor %0"\r | |
139 | :\r | |
140 | : "m" (*Buffer) // %0\r | |
141 | );\r | |
142 | }\r | |
143 | \r | |
144 | \r | |
145 | /**\r | |
146 | Reads the current value of 64-bit MMX Register #0 (MM0).\r | |
147 | \r | |
148 | Reads and returns the current value of MM0. This function is only available\r | |
149 | on IA-32 and X64.\r | |
150 | \r | |
151 | @return The current value of MM0.\r | |
152 | \r | |
153 | **/\r | |
154 | UINT64\r | |
155 | EFIAPI\r | |
156 | AsmReadMm0 (\r | |
157 | VOID\r | |
158 | )\r | |
159 | {\r | |
160 | UINT64 Data;\r | |
161 | \r | |
162 | __asm__ __volatile__ (\r | |
163 | "movd %%mm0, %0 \n\t"\r | |
164 | : "=r" (Data) // %0\r | |
165 | );\r | |
9095d37b | 166 | \r |
cf683fed | 167 | return Data;\r |
168 | }\r | |
169 | \r | |
170 | \r | |
171 | /**\r | |
172 | Reads the current value of 64-bit MMX Register #1 (MM1).\r | |
173 | \r | |
174 | Reads and returns the current value of MM1. This function is only available\r | |
175 | on IA-32 and X64.\r | |
176 | \r | |
177 | @return The current value of MM1.\r | |
178 | \r | |
179 | **/\r | |
180 | UINT64\r | |
181 | EFIAPI\r | |
182 | AsmReadMm1 (\r | |
183 | VOID\r | |
184 | )\r | |
185 | {\r | |
186 | UINT64 Data;\r | |
187 | \r | |
188 | __asm__ __volatile__ (\r | |
189 | "movd %%mm1, %0 \n\t"\r | |
190 | : "=r" (Data) // %0\r | |
191 | );\r | |
9095d37b | 192 | \r |
cf683fed | 193 | return Data;\r |
194 | }\r | |
195 | \r | |
196 | \r | |
197 | /**\r | |
198 | Reads the current value of 64-bit MMX Register #2 (MM2).\r | |
199 | \r | |
200 | Reads and returns the current value of MM2. This function is only available\r | |
201 | on IA-32 and X64.\r | |
202 | \r | |
203 | @return The current value of MM2.\r | |
204 | \r | |
205 | **/\r | |
206 | UINT64\r | |
207 | EFIAPI\r | |
208 | AsmReadMm2 (\r | |
209 | VOID\r | |
210 | )\r | |
211 | {\r | |
212 | UINT64 Data;\r | |
213 | \r | |
214 | __asm__ __volatile__ (\r | |
215 | "movd %%mm2, %0 \n\t"\r | |
216 | : "=r" (Data) // %0\r | |
217 | );\r | |
9095d37b | 218 | \r |
cf683fed | 219 | return Data;\r |
220 | }\r | |
221 | \r | |
222 | \r | |
223 | /**\r | |
224 | Reads the current value of 64-bit MMX Register #3 (MM3).\r | |
225 | \r | |
226 | Reads and returns the current value of MM3. This function is only available\r | |
227 | on IA-32 and X64.\r | |
228 | \r | |
229 | @return The current value of MM3.\r | |
230 | \r | |
231 | **/\r | |
232 | UINT64\r | |
233 | EFIAPI\r | |
234 | AsmReadMm3 (\r | |
235 | VOID\r | |
236 | )\r | |
237 | {\r | |
238 | UINT64 Data;\r | |
239 | \r | |
240 | __asm__ __volatile__ (\r | |
241 | "movd %%mm3, %0 \n\t"\r | |
242 | : "=r" (Data) // %0\r | |
243 | );\r | |
9095d37b | 244 | \r |
cf683fed | 245 | return Data;\r |
246 | }\r | |
247 | \r | |
248 | \r | |
249 | /**\r | |
250 | Reads the current value of 64-bit MMX Register #4 (MM4).\r | |
251 | \r | |
252 | Reads and returns the current value of MM4. This function is only available\r | |
253 | on IA-32 and X64.\r | |
254 | \r | |
255 | @return The current value of MM4.\r | |
256 | \r | |
257 | **/\r | |
258 | UINT64\r | |
259 | EFIAPI\r | |
260 | AsmReadMm4 (\r | |
261 | VOID\r | |
262 | )\r | |
263 | {\r | |
264 | UINT64 Data;\r | |
265 | \r | |
266 | __asm__ __volatile__ (\r | |
267 | "movd %%mm4, %0 \n\t"\r | |
268 | : "=r" (Data) // %0\r | |
269 | );\r | |
9095d37b | 270 | \r |
cf683fed | 271 | return Data;\r |
272 | }\r | |
273 | \r | |
274 | \r | |
275 | /**\r | |
276 | Reads the current value of 64-bit MMX Register #5 (MM5).\r | |
277 | \r | |
278 | Reads and returns the current value of MM5. This function is only available\r | |
279 | on IA-32 and X64.\r | |
280 | \r | |
281 | @return The current value of MM5.\r | |
282 | \r | |
283 | **/\r | |
284 | UINT64\r | |
285 | EFIAPI\r | |
286 | AsmReadMm5 (\r | |
287 | VOID\r | |
288 | )\r | |
289 | {\r | |
290 | UINT64 Data;\r | |
291 | \r | |
292 | __asm__ __volatile__ (\r | |
293 | "movd %%mm5, %0 \n\t"\r | |
294 | : "=r" (Data) // %0\r | |
295 | );\r | |
9095d37b | 296 | \r |
cf683fed | 297 | return Data;\r |
298 | }\r | |
299 | \r | |
300 | \r | |
301 | /**\r | |
302 | Reads the current value of 64-bit MMX Register #6 (MM6).\r | |
303 | \r | |
304 | Reads and returns the current value of MM6. This function is only available\r | |
305 | on IA-32 and X64.\r | |
306 | \r | |
307 | @return The current value of MM6.\r | |
308 | \r | |
309 | **/\r | |
310 | UINT64\r | |
311 | EFIAPI\r | |
312 | AsmReadMm6 (\r | |
313 | VOID\r | |
314 | )\r | |
315 | {\r | |
316 | UINT64 Data;\r | |
317 | \r | |
318 | __asm__ __volatile__ (\r | |
319 | "movd %%mm6, %0 \n\t"\r | |
320 | : "=r" (Data) // %0\r | |
321 | );\r | |
9095d37b | 322 | \r |
cf683fed | 323 | return Data;\r |
324 | }\r | |
325 | \r | |
326 | \r | |
327 | /**\r | |
328 | Reads the current value of 64-bit MMX Register #7 (MM7).\r | |
329 | \r | |
330 | Reads and returns the current value of MM7. This function is only available\r | |
331 | on IA-32 and X64.\r | |
332 | \r | |
333 | @return The current value of MM7.\r | |
334 | \r | |
335 | **/\r | |
336 | UINT64\r | |
337 | EFIAPI\r | |
338 | AsmReadMm7 (\r | |
339 | VOID\r | |
340 | )\r | |
341 | {\r | |
342 | UINT64 Data;\r | |
343 | \r | |
344 | __asm__ __volatile__ (\r | |
345 | "movd %%mm7, %0 \n\t"\r | |
346 | : "=r" (Data) // %0\r | |
347 | );\r | |
9095d37b | 348 | \r |
cf683fed | 349 | return Data;\r |
350 | }\r | |
351 | \r | |
352 | \r | |
353 | /**\r | |
354 | Writes the current value of 64-bit MMX Register #0 (MM0).\r | |
355 | \r | |
356 | Writes the current value of MM0. This function is only available on IA32 and\r | |
357 | X64.\r | |
358 | \r | |
359 | @param Value The 64-bit value to write to MM0.\r | |
360 | \r | |
361 | **/\r | |
362 | VOID\r | |
363 | EFIAPI\r | |
364 | AsmWriteMm0 (\r | |
365 | IN UINT64 Value\r | |
366 | )\r | |
367 | {\r | |
368 | __asm__ __volatile__ (\r | |
369 | "movd %0, %%mm0" // %0\r | |
9095d37b | 370 | :\r |
cf683fed | 371 | : "m" (Value)\r |
372 | );\r | |
373 | }\r | |
374 | \r | |
375 | \r | |
376 | /**\r | |
377 | Writes the current value of 64-bit MMX Register #1 (MM1).\r | |
378 | \r | |
379 | Writes the current value of MM1. This function is only available on IA32 and\r | |
380 | X64.\r | |
381 | \r | |
382 | @param Value The 64-bit value to write to MM1.\r | |
383 | \r | |
384 | **/\r | |
385 | VOID\r | |
386 | EFIAPI\r | |
387 | AsmWriteMm1 (\r | |
388 | IN UINT64 Value\r | |
389 | )\r | |
390 | {\r | |
391 | __asm__ __volatile__ (\r | |
392 | "movd %0, %%mm1" // %0\r | |
9095d37b | 393 | :\r |
cf683fed | 394 | : "m" (Value)\r |
395 | );\r | |
396 | }\r | |
397 | \r | |
398 | \r | |
399 | /**\r | |
400 | Writes the current value of 64-bit MMX Register #2 (MM2).\r | |
401 | \r | |
402 | Writes the current value of MM2. This function is only available on IA32 and\r | |
403 | X64.\r | |
404 | \r | |
405 | @param Value The 64-bit value to write to MM2.\r | |
406 | \r | |
407 | **/\r | |
408 | VOID\r | |
409 | EFIAPI\r | |
410 | AsmWriteMm2 (\r | |
411 | IN UINT64 Value\r | |
412 | )\r | |
413 | {\r | |
414 | __asm__ __volatile__ (\r | |
415 | "movd %0, %%mm2" // %0\r | |
9095d37b | 416 | :\r |
cf683fed | 417 | : "m" (Value)\r |
418 | );\r | |
419 | }\r | |
420 | \r | |
421 | \r | |
422 | /**\r | |
423 | Writes the current value of 64-bit MMX Register #3 (MM3).\r | |
424 | \r | |
425 | Writes the current value of MM3. This function is only available on IA32 and\r | |
426 | X64.\r | |
427 | \r | |
428 | @param Value The 64-bit value to write to MM3.\r | |
429 | \r | |
430 | **/\r | |
431 | VOID\r | |
432 | EFIAPI\r | |
433 | AsmWriteMm3 (\r | |
434 | IN UINT64 Value\r | |
435 | )\r | |
436 | {\r | |
437 | __asm__ __volatile__ (\r | |
438 | "movd %0, %%mm3" // %0\r | |
9095d37b | 439 | :\r |
cf683fed | 440 | : "m" (Value)\r |
441 | );\r | |
442 | }\r | |
443 | \r | |
444 | \r | |
445 | /**\r | |
446 | Writes the current value of 64-bit MMX Register #4 (MM4).\r | |
447 | \r | |
448 | Writes the current value of MM4. This function is only available on IA32 and\r | |
449 | X64.\r | |
450 | \r | |
451 | @param Value The 64-bit value to write to MM4.\r | |
452 | \r | |
453 | **/\r | |
454 | VOID\r | |
455 | EFIAPI\r | |
456 | AsmWriteMm4 (\r | |
457 | IN UINT64 Value\r | |
458 | )\r | |
459 | {\r | |
460 | __asm__ __volatile__ (\r | |
461 | "movd %0, %%mm4" // %0\r | |
9095d37b | 462 | :\r |
cf683fed | 463 | : "m" (Value)\r |
464 | );\r | |
465 | }\r | |
466 | \r | |
467 | \r | |
468 | /**\r | |
469 | Writes the current value of 64-bit MMX Register #5 (MM5).\r | |
470 | \r | |
471 | Writes the current value of MM5. This function is only available on IA32 and\r | |
472 | X64.\r | |
473 | \r | |
474 | @param Value The 64-bit value to write to MM5.\r | |
475 | \r | |
476 | **/\r | |
477 | VOID\r | |
478 | EFIAPI\r | |
479 | AsmWriteMm5 (\r | |
480 | IN UINT64 Value\r | |
481 | )\r | |
482 | {\r | |
483 | __asm__ __volatile__ (\r | |
484 | "movd %0, %%mm5" // %0\r | |
9095d37b | 485 | :\r |
cf683fed | 486 | : "m" (Value)\r |
487 | );\r | |
488 | }\r | |
489 | \r | |
490 | \r | |
491 | /**\r | |
492 | Writes the current value of 64-bit MMX Register #6 (MM6).\r | |
493 | \r | |
494 | Writes the current value of MM6. This function is only available on IA32 and\r | |
495 | X64.\r | |
496 | \r | |
497 | @param Value The 64-bit value to write to MM6.\r | |
498 | \r | |
499 | **/\r | |
500 | VOID\r | |
501 | EFIAPI\r | |
502 | AsmWriteMm6 (\r | |
503 | IN UINT64 Value\r | |
504 | )\r | |
505 | {\r | |
506 | __asm__ __volatile__ (\r | |
507 | "movd %0, %%mm6" // %0\r | |
9095d37b | 508 | :\r |
cf683fed | 509 | : "m" (Value)\r |
510 | );\r | |
511 | }\r | |
512 | \r | |
513 | \r | |
514 | /**\r | |
515 | Writes the current value of 64-bit MMX Register #7 (MM7).\r | |
516 | \r | |
517 | Writes the current value of MM7. This function is only available on IA32 and\r | |
518 | X64.\r | |
519 | \r | |
520 | @param Value The 64-bit value to write to MM7.\r | |
521 | \r | |
522 | **/\r | |
523 | VOID\r | |
524 | EFIAPI\r | |
525 | AsmWriteMm7 (\r | |
526 | IN UINT64 Value\r | |
527 | )\r | |
528 | {\r | |
529 | __asm__ __volatile__ (\r | |
530 | "movd %0, %%mm7" // %0\r | |
9095d37b | 531 | :\r |
cf683fed | 532 | : "m" (Value)\r |
533 | );\r | |
534 | }\r | |
535 | \r | |
536 | \r | |
537 | /**\r | |
538 | Reads the current value of Time Stamp Counter (TSC).\r | |
539 | \r | |
540 | Reads and returns the current value of TSC. This function is only available\r | |
541 | on IA-32 and X64.\r | |
542 | \r | |
543 | @return The current value of TSC\r | |
544 | \r | |
545 | **/\r | |
546 | UINT64\r | |
547 | EFIAPI\r | |
548 | AsmReadTsc (\r | |
549 | VOID\r | |
550 | )\r | |
551 | {\r | |
552 | UINT32 LowData;\r | |
553 | UINT32 HiData;\r | |
9095d37b | 554 | \r |
cf683fed | 555 | __asm__ __volatile__ (\r |
556 | "rdtsc"\r | |
557 | : "=a" (LowData),\r | |
558 | "=d" (HiData)\r | |
559 | );\r | |
9095d37b LG |
560 | \r |
561 | return (((UINT64)HiData) << 32) | LowData;\r | |
cf683fed | 562 | }\r |