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08e2be29 MW |
1 | /* -*-c-*- |
2 | * | |
3 | * CPU-specific dispatch | |
4 | * | |
5 | * (c) 2015 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
16 | * | |
17 | * Catacomb is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU Library General Public | |
23 | * License along with Catacomb; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
28 | /*----- Header files ------------------------------------------------------*/ | |
29 | ||
30 | #include "config.h" | |
31 | ||
0ed9f882 | 32 | #include <assert.h> |
08e2be29 | 33 | #include <ctype.h> |
fac645f7 MW |
34 | #include <stdarg.h> |
35 | #include <stdio.h> | |
08e2be29 MW |
36 | #include <stdlib.h> |
37 | #include <string.h> | |
38 | ||
39 | #include <mLib/macros.h> | |
40 | ||
41 | #include "dispatch.h" | |
42 | ||
d26ad211 | 43 | /*----- Intel x86/AMD64 feature probing -----------------------------------*/ |
08e2be29 | 44 | |
0f23f75f | 45 | #if CPUFAM_X86 || CPUFAM_AMD64 |
08e2be29 | 46 | |
0ed9f882 MW |
47 | enum { |
48 | CPUID_1_D, /* eax = 1 => edx&?? */ | |
7680f863 MW |
49 | # define CPUID1D_SSE2 (1u << 26) |
50 | # define CPUID1D_FXSR (1u << 24) | |
0ed9f882 MW |
51 | |
52 | CPUID_1_C, /* eax = 1 => ecx&?? */ | |
9e6a4409 MW |
53 | # define CPUID1C_PCLMUL (1u << 1) |
54 | # define CPUID1C_SSSE3 (1u << 9) | |
7680f863 | 55 | # define CPUID1C_AESNI (1u << 25) |
b9b279b4 | 56 | # define CPUID1C_AVX (1u << 28) |
d25653be | 57 | # define CPUID1C_RDRAND (1u << 30) |
08e2be29 | 58 | |
6c0946ef MW |
59 | CPUID_7_0_B, /* eax = 7, ecx = 0 => ebx&?? */ |
60 | # define CPUID70B_RDSEED (1u << 18) | |
0ed9f882 MW |
61 | }; |
62 | ||
08e2be29 | 63 | struct cpuid { unsigned a, b, c, d; }; |
a3ad4421 MW |
64 | extern int dispatch_x86ish_cpuid(struct cpuid *, unsigned a, unsigned c); |
65 | extern int dispatch_x86ish_xmmregisters_p(void); | |
1b07c4f3 | 66 | extern int dispatch_x86ish_rdrand(unsigned op, unsigned *); |
08e2be29 MW |
67 | |
68 | static void cpuid(struct cpuid *cc, unsigned a, unsigned c) | |
69 | { | |
a3ad4421 MW |
70 | int rc = dispatch_x86ish_cpuid(cc, a, c); |
71 | if (rc) | |
fac645f7 | 72 | dispatch_debug("CPUID instruction not available"); |
a3ad4421 MW |
73 | else |
74 | dispatch_debug("CPUID(%08x, %08x) -> %08x, %08x, %08x, %08x", | |
75 | a, c, cc->a, cc->b, cc->c, cc->d); | |
08e2be29 MW |
76 | } |
77 | ||
78 | static unsigned cpuid_maxleaf(void) | |
79 | { struct cpuid c; cpuid(&c, 0, 0); return (c.a); } | |
80 | ||
0ed9f882 | 81 | /* --- @cpuid_feature_p@ --- * |
11b17977 | 82 | * |
0ed9f882 MW |
83 | * Arguments: @unsigned leaf@ = leaf to look up |
84 | * @unsigned bits@ = bits to check | |
11b17977 | 85 | * |
0ed9f882 MW |
86 | * Returns: Nonzero if all the requested bits are set in the requested |
87 | * CPUID result. | |
11b17977 MW |
88 | */ |
89 | ||
0ed9f882 | 90 | static int cpuid_feature_p(unsigned leaf, unsigned bits) |
08e2be29 MW |
91 | { |
92 | struct cpuid c; | |
0ed9f882 MW |
93 | unsigned r; |
94 | ||
95 | switch (leaf) { | |
96 | case CPUID_1_D: | |
97 | if (cpuid_maxleaf() < 1) return (0); | |
98 | cpuid(&c, 1, 0); r = c.d; | |
99 | break; | |
100 | case CPUID_1_C: | |
101 | if (cpuid_maxleaf() < 1) return (0); | |
102 | cpuid(&c, 1, 0); r = c.c; | |
103 | break; | |
6c0946ef MW |
104 | case CPUID_7_0_B: |
105 | if (cpuid_maxleaf() < 7) return (0); | |
106 | cpuid(&c, 7, 0); r = c.b; | |
107 | break; | |
0ed9f882 MW |
108 | default: |
109 | assert(!"unknown cpuid leaf"); | |
110 | } | |
111 | return ((r&bits) == bits); | |
08e2be29 MW |
112 | } |
113 | ||
11b17977 MW |
114 | /* --- @xmm_registers_available_p@ --- * |
115 | * | |
116 | * Arguments: --- | |
117 | * | |
118 | * Returns: Nonzero if the operating system has made the XMM registers | |
119 | * available for use. | |
120 | */ | |
121 | ||
acbe16df MW |
122 | static int xmm_registers_available_p(void) |
123 | { | |
a3ad4421 MW |
124 | int f = dispatch_x86ish_xmmregisters_p(); |
125 | ||
0f23f75f | 126 | dispatch_debug("XMM registers %savailable", f ? "" : "not "); |
acbe16df | 127 | return (f); |
acbe16df MW |
128 | } |
129 | ||
35b1eba8 MW |
130 | /* --- @rdrand_works_p@ --- * |
131 | * | |
132 | * | |
133 | * Arguments: --- | |
134 | * | |
135 | * Returns: Nonzero if the `rdrand' instruction actually works. Assumes | |
136 | * that it's already been verified to be safe to issue. | |
137 | */ | |
138 | ||
1b07c4f3 MW |
139 | enum { OP_RDRAND, OP_RDSEED }; |
140 | ||
141 | static int rdrand_works_p(unsigned op) | |
35b1eba8 MW |
142 | { |
143 | unsigned ref, x, i; | |
1b07c4f3 MW |
144 | const char *what; |
145 | ||
146 | switch (op) { | |
147 | case OP_RDRAND: what = "RDRAND"; break; | |
6c0946ef | 148 | case OP_RDSEED: what = "RDSEED"; break; |
1b07c4f3 MW |
149 | default: assert(!"unexpected op"); |
150 | } | |
35b1eba8 MW |
151 | |
152 | /* Check that it doesn't always give the same answer. Try four times: this | |
153 | * will fail with probability %$2^{-128}$% with a truly random generator, | |
154 | * which seems fair enough. | |
155 | */ | |
1b07c4f3 | 156 | if (dispatch_x86ish_rdrand(op, &ref)) goto fail; |
35b1eba8 | 157 | for (i = 0; i < 4; i++) { |
1b07c4f3 | 158 | if (dispatch_x86ish_rdrand(op, &x)) goto fail; |
35b1eba8 MW |
159 | if (x != ref) goto not_stuck; |
160 | } | |
1b07c4f3 | 161 | dispatch_debug("%s always returns 0x%08x!", what, ref); |
35b1eba8 MW |
162 | return (0); |
163 | ||
164 | not_stuck: | |
1b07c4f3 | 165 | dispatch_debug("%s instruction looks plausible", what); |
35b1eba8 MW |
166 | return (1); |
167 | ||
168 | fail: | |
1b07c4f3 | 169 | dispatch_debug("%s instruction fails too often", what); |
35b1eba8 MW |
170 | return (0); |
171 | } | |
172 | ||
08e2be29 MW |
173 | #endif |
174 | ||
a02a22d4 MW |
175 | /*----- General feature probing using auxiliary vectors -------------------*/ |
176 | ||
177 | /* Try to find the system's definitions for auxiliary vector entries. */ | |
178 | #ifdef HAVE_SYS_AUXV_H | |
179 | # include <sys/auxv.h> | |
a0e9bb8a MW |
180 | #endif |
181 | #ifdef HAVE_LINUX_AUXVEC_H | |
182 | # include <linux/auxvec.h> | |
183 | #endif | |
184 | #ifdef HAVE_ASM_HWCAP_H | |
185 | # include <asm/hwcap.h> | |
a02a22d4 MW |
186 | #endif |
187 | ||
188 | /* The type of entries in the auxiliary vector. I'm assuming that `unsigned | |
189 | * long' matches each platform's word length; if this is false then we'll | |
190 | * need some host-specific tweaking here. | |
191 | */ | |
192 | union auxval { long i; unsigned long u; const void *p; }; | |
193 | struct auxentry { unsigned long type; union auxval value; }; | |
194 | ||
195 | /* Register each CPU family's interest in the auxiliary vector. Make sure | |
196 | * that the necessary entry types are defined. This is primarily ordered by | |
197 | * entry type to minimize duplication. | |
198 | */ | |
61bd904b MW |
199 | #if defined(AT_HWCAP) && CPUFAM_ARMEL |
200 | # define WANT_ANY 1 | |
201 | # define WANT_AT_HWCAP(_) _(AT_HWCAP, u, hwcap) | |
202 | #endif | |
a02a22d4 | 203 | |
e492db88 MW |
204 | #if defined(AT_HWCAP) && CPUFAM_ARM64 |
205 | # define WANT_ANY 1 | |
206 | # define WANT_AT_HWCAP(_) _(AT_HWCAP, u, hwcap) | |
207 | #endif | |
208 | ||
26e182fc MW |
209 | #if defined(AT_HWCAP2) && CPUFAM_ARMEL |
210 | # define WANT_ANY 1 | |
211 | # define WANT_AT_HWCAP2(_) _(AT_HWCAP2, u, hwcap2) | |
212 | #endif | |
213 | ||
a02a22d4 MW |
214 | /* If we couldn't find any interesting entries then we can switch all of this |
215 | * machinery off. Also do that if we have no means for atomic updates. | |
216 | */ | |
217 | #if WANT_ANY && CPU_DISPATCH_P | |
218 | ||
219 | /* The main output of this section is a bitmask of detected features. The | |
220 | * least significant bit will be set if we've tried to probe. Always access | |
221 | * this using `DISPATCH_LOAD' and `DISPATCH_STORE'. | |
222 | */ | |
223 | static unsigned hwcaps = 0; | |
224 | ||
225 | /* For each potentially interesting type which turned out not to exist or be | |
226 | * wanted, define a dummy macro for the sake of the next step. | |
227 | */ | |
228 | #ifndef WANT_AT_HWCAP | |
229 | # define WANT_AT_HWCAP(_) | |
230 | #endif | |
f013a4f2 MW |
231 | #ifndef WANT_AT_HWCAP2 |
232 | # define WANT_AT_HWCAP2(_) | |
233 | #endif | |
a02a22d4 MW |
234 | |
235 | /* For each CPU family, define two lists. | |
236 | * | |
237 | * * `WANTAUX' is a list of the `WANT_AT_MUMBLE' macros which the CPU | |
238 | * family tried to register interest in above. Each entry contains the | |
239 | * interesting auxiliary vector entry type, the name of the union branch | |
240 | * for its value, and the name of the slot in `struct auxprobe' in which | |
241 | * to store the value. | |
242 | * | |
243 | * * `CAPMAP' is a list describing the output features which the CPU family | |
244 | * intends to satisfy from the auxiliary vector. Each entry contains a | |
245 | * feature name suffix, and the token name (for `check_env'). | |
246 | */ | |
61bd904b MW |
247 | #if CPUFAM_ARMEL |
248 | # define WANTAUX(_) \ | |
26e182fc MW |
249 | WANT_AT_HWCAP(_) \ |
250 | WANT_AT_HWCAP2(_) | |
61bd904b MW |
251 | # define CAPMAP(_) \ |
252 | _(ARM_VFP, "arm:vfp") \ | |
253 | _(ARM_NEON, "arm:neon") \ | |
254 | _(ARM_V4, "arm:v4") \ | |
26e182fc | 255 | _(ARM_D32, "arm:d32") \ |
9e6a4409 MW |
256 | _(ARM_AES, "arm:aes") \ |
257 | _(ARM_PMULL, "arm:pmull") | |
61bd904b | 258 | #endif |
e492db88 MW |
259 | #if CPUFAM_ARM64 |
260 | # define WANTAUX(_) \ | |
261 | WANT_AT_HWCAP(_) | |
262 | # define CAPMAP(_) \ | |
cb7f92c4 | 263 | _(ARM_NEON, "arm:neon") \ |
9e6a4409 MW |
264 | _(ARM_AES, "arm:aes") \ |
265 | _(ARM_PMULL, "arm:pmull") | |
e492db88 | 266 | #endif |
a02a22d4 MW |
267 | |
268 | /* Build the bitmask for `hwcaps' from the `CAPMAP' list. */ | |
269 | enum { | |
270 | HFI_PROBED = 0, | |
271 | #define HFI__ENUM(feat, tok) HFI_##feat, | |
272 | CAPMAP(HFI__ENUM) | |
273 | #undef HFI__ENUM | |
274 | HFI__END | |
275 | }; | |
276 | enum { | |
277 | HF_PROBED = 1, | |
278 | #define HF__FLAG(feat, tok) HF_##feat = 1 << HFI_##feat, | |
279 | CAPMAP(HF__FLAG) | |
280 | #undef HF__FLAG | |
281 | HF__END | |
282 | }; | |
283 | ||
284 | /* Build a structure in which we can capture the interesting data from the | |
285 | * auxiliary vector. | |
286 | */ | |
287 | #define AUXUTYPE_i long | |
288 | #define AUXUTYPE_u unsigned long | |
289 | #define AUXUTYPE_p const void * | |
290 | struct auxprobe { | |
291 | #define AUXPROBE__SLOT(type, ubranch, slot) AUXUTYPE_##ubranch slot; | |
292 | WANTAUX(AUXPROBE__SLOT) | |
293 | #undef AUXPROBE_SLOT | |
294 | }; | |
295 | ||
296 | /* --- @probe_hwcaps@ --- * | |
297 | * | |
298 | * Arguments: --- | |
299 | * | |
300 | * Returns: --- | |
301 | * | |
302 | * Use: Attempt to find the auxiliary vector (which is well hidden) | |
303 | * and discover interesting features from it. | |
304 | */ | |
305 | ||
306 | static void probe_hwcaps(void) | |
307 | { | |
308 | unsigned hw = HF_PROBED; | |
309 | struct auxprobe probed = { 0 }; | |
310 | ||
311 | /* Populate `probed' with the information we manage to retrieve from the | |
312 | * auxiliary vector. Slots we couldn't find are left zero-valued. | |
313 | */ | |
314 | #if defined(HAVE_GETAUXVAL) | |
315 | /* Shiny new libc lets us request individual entry types. This is almost | |
316 | * too easy. | |
317 | */ | |
84850eec MW |
318 | # define CAP__GET(type, ubranch, slot) \ |
319 | probed.slot = (AUXUTYPE_##ubranch)getauxval(type); | |
a02a22d4 MW |
320 | WANTAUX(CAP__GET) |
321 | #else | |
322 | /* Otherwise we're a bit stuck, really. Modern Linux kernels make a copy | |
323 | * of the vector available in `/procc' so we could try that. | |
324 | * | |
325 | * The usual place is stuck on the end of the environment vector, but that | |
326 | * may well have moved, and we have no way of telling whether it has or | |
327 | * whether there was ever an auxiliary vector there at all; so don't do | |
328 | * that. | |
329 | */ | |
330 | { | |
331 | FILE *fp = 0; | |
332 | unsigned char *p = 0, *q = 0; | |
333 | const struct auxentry *a; | |
334 | size_t sz, off, n; | |
335 | ||
336 | /* Open the file and read it into a memory chunk. */ | |
337 | if ((fp = fopen("/proc/self/auxv", "rb")) == 0) goto clean; | |
338 | sz = 4096; off = 0; | |
339 | if ((p = malloc(sz)) == 0) goto clean; | |
340 | for (;;) { | |
341 | n = fread(p + off, 1, sz - off, fp); | |
342 | off += n; | |
343 | if (off < sz) break; | |
344 | sz *= 2; if ((q = realloc(p, sz)) == 0) break; | |
345 | p = q; | |
346 | } | |
347 | ||
348 | /* Work through the vector (or as much of it as we found) and extract the | |
349 | * types we're interested in. | |
350 | */ | |
351 | for (a = (const struct auxentry *)p, | |
352 | n = sz/sizeof(struct auxentry); | |
353 | n--; a++) { | |
354 | switch (a->type) { | |
355 | #define CAP__SWITCH(type, ubranch, slot) \ | |
356 | case type: probed.slot = a->value.ubranch; break; | |
357 | WANTAUX(CAP__SWITCH) | |
dfcb2a0b | 358 | case AT_NULL: goto clean; |
a02a22d4 MW |
359 | } |
360 | } | |
361 | ||
362 | clean: | |
363 | if (p) free(p); | |
364 | if (fp) fclose(fp); | |
365 | } | |
366 | #endif | |
367 | ||
368 | /* Each CPU family now has to pick through what was found and stashed in | |
369 | * `probed', and set the appropriate flag bits in `hw'. | |
370 | */ | |
61bd904b MW |
371 | #if CPUFAM_ARMEL |
372 | if (probed.hwcap & HWCAP_VFPv3) hw |= HF_ARM_VFP; | |
373 | if (probed.hwcap & HWCAP_NEON) hw |= HF_ARM_NEON; | |
374 | if (probed.hwcap & HWCAP_VFPD32) hw |= HF_ARM_D32; | |
375 | if (probed.hwcap & HWCAP_VFPv4) hw |= HF_ARM_V4; | |
26e182fc MW |
376 | # ifdef HWCAP2_AES |
377 | if (probed.hwcap2 & HWCAP2_AES) hw |= HF_ARM_AES; | |
378 | # endif | |
9e6a4409 MW |
379 | # ifdef HWCAP2_PMULL |
380 | if (probed.hwcap2 & HWCAP2_PMULL) hw |= HF_ARM_PMULL; | |
381 | # endif | |
e492db88 MW |
382 | #endif |
383 | #if CPUFAM_ARM64 | |
cb7f92c4 | 384 | if (probed.hwcap & HWCAP_ASIMD) hw |= HF_ARM_NEON; |
e492db88 | 385 | if (probed.hwcap & HWCAP_AES) hw |= HF_ARM_AES; |
9e6a4409 | 386 | if (probed.hwcap & HWCAP_PMULL) hw |= HF_ARM_PMULL; |
61bd904b | 387 | #endif |
a02a22d4 MW |
388 | |
389 | /* Store the bitmask of features we probed for everyone to see. */ | |
390 | DISPATCH_STORE(hwcaps, hw); | |
391 | ||
392 | /* Finally, make a report about the things we found. (Doing this earlier | |
393 | * will pointlessly widen the window in which multiple threads will do the | |
394 | * above auxiliary-vector probing.) | |
395 | */ | |
396 | #define CAP__DEBUG(feat, tok) \ | |
397 | dispatch_debug("check auxv for feature `%s': %s", tok, \ | |
398 | hw & HF_##feat ? "available" : "absent"); | |
399 | CAPMAP(CAP__DEBUG) | |
400 | #undef CAP__DEBUG | |
401 | } | |
402 | ||
403 | /* --- @get_hwcaps@ --- * | |
404 | * | |
405 | * Arguments: --- | |
406 | * | |
407 | * Returns: A mask of hardware capabilities and other features, as probed | |
408 | * from the auxiliary vector. | |
409 | */ | |
410 | ||
411 | static unsigned get_hwcaps(void) | |
412 | { | |
413 | unsigned hw; | |
414 | ||
415 | DISPATCH_LOAD(hwcaps, hw); | |
7c545e7b | 416 | if (!(hw & HF_PROBED)) { probe_hwcaps(); DISPATCH_LOAD(hwcaps, hw); } |
a02a22d4 MW |
417 | return (hw); |
418 | } | |
419 | ||
420 | #endif | |
421 | ||
d26ad211 MW |
422 | /*----- External interface ------------------------------------------------*/ |
423 | ||
fac645f7 MW |
424 | /* --- @dispatch_debug@ --- * |
425 | * | |
426 | * Arguments: @const char *fmt@ = a format string | |
427 | * @...@ = additional arguments | |
428 | * | |
429 | * Returns: --- | |
430 | * | |
431 | * Use: Writes a formatted message to standard output if dispatch | |
432 | * debugging is enabled. | |
433 | */ | |
434 | ||
435 | void dispatch_debug(const char *fmt, ...) | |
436 | { | |
437 | va_list ap; | |
438 | const char *e = getenv("CATACOMB_CPUDISPATCH_DEBUG"); | |
439 | ||
440 | if (e && *e != 'n' && *e != '0') { | |
441 | va_start(ap, fmt); | |
442 | fputs("Catacomb CPUDISPATCH: ", stderr); | |
443 | vfprintf(stderr, fmt, ap); | |
444 | fputc('\n', stderr); | |
445 | va_end(ap); | |
446 | } | |
447 | } | |
448 | ||
08e2be29 MW |
449 | /* --- @check_env@ --- * |
450 | * | |
451 | * Arguments: @const char *ftok@ = feature token | |
452 | * | |
453 | * Returns: Zero if the feature is forced off; positive if it's forced | |
454 | * on; negative if the user hasn't decided. | |
455 | * | |
456 | * Use: Checks the environment variable `CATACOMB_CPUFEAT' for the | |
457 | * feature token @ftok@. The variable, if it exists, should be | |
458 | * a space-separated sequence of `+tok' and `-tok' items. These | |
459 | * tokens may end in `*', which matches any suffix. | |
460 | */ | |
461 | ||
462 | static int IGNORABLE check_env(const char *ftok) | |
463 | { | |
464 | const char *p, *q, *pp; | |
465 | int d; | |
466 | ||
467 | p = getenv("CATACOMB_CPUFEAT"); | |
468 | if (!p) return (-1); | |
469 | ||
470 | for (;;) { | |
141c1284 | 471 | while (ISSPACE(*p)) p++; |
08e2be29 MW |
472 | if (!*p) return (-1); |
473 | switch (*p) { | |
474 | case '+': d = +1; p++; break; | |
475 | case '-': d = 0; p++; break; | |
476 | default: d = -1; break; | |
477 | } | |
141c1284 | 478 | for (q = p; *q && !ISSPACE(*q); q++); |
08e2be29 MW |
479 | if (d >= 0) { |
480 | for (pp = ftok; p < q && *pp && *p == *pp; p++, pp++); | |
481 | if ((p == q && !*pp) || (*p == '*' && p + 1 == q)) return (d); | |
482 | } | |
483 | p = q; | |
484 | } | |
485 | return (-1); | |
486 | } | |
487 | ||
488 | /* --- @cpu_feature_p@ --- * | |
489 | * | |
490 | * Arguments: @unsigned feat@ = a @CPUFEAT_...@ code | |
491 | * | |
492 | * Returns: Nonzero if the feature is available. | |
493 | */ | |
494 | ||
495 | #include <stdio.h> | |
496 | ||
fac645f7 MW |
497 | static int IGNORABLE |
498 | feat_debug(const char *ftok, const char *check, int verdict) | |
499 | { | |
500 | if (verdict >= 0) { | |
501 | dispatch_debug("feature `%s': %s -> %s", ftok, check, | |
502 | verdict ? "available" : "absent"); | |
503 | } | |
504 | return (verdict); | |
505 | } | |
506 | ||
08e2be29 MW |
507 | int cpu_feature_p(int feat) |
508 | { | |
509 | int IGNORABLE f; | |
510 | IGNORE(f); | |
fac645f7 | 511 | #define CASE_CPUFEAT(feat, ftok, cond) case CPUFEAT_##feat: \ |
bb52c31d | 512 | if ((f = feat_debug(ftok, "environment override", check_env(ftok))) >= 0) \ |
fac645f7 MW |
513 | return (f); \ |
514 | else \ | |
515 | return (feat_debug(ftok, "runtime probe", cond)); | |
08e2be29 MW |
516 | |
517 | switch (feat) { | |
0f23f75f | 518 | #if CPUFAM_X86 || CPUFAM_AMD64 |
fac645f7 | 519 | CASE_CPUFEAT(X86_SSE2, "x86:sse2", |
0ed9f882 | 520 | cpuid_feature_p(CPUID_1_D, CPUID1D_SSE2) && |
4fab22c2 | 521 | xmm_registers_available_p()); |
fac645f7 | 522 | CASE_CPUFEAT(X86_AESNI, "x86:aesni", |
9c349746 | 523 | cpuid_feature_p(CPUID_1_C, CPUID1C_AESNI) && |
4fab22c2 | 524 | xmm_registers_available_p()); |
d25653be | 525 | CASE_CPUFEAT(X86_RDRAND, "x86:rdrand", |
0ed9f882 | 526 | cpuid_feature_p(CPUID_1_C, CPUID1C_RDRAND) && |
1b07c4f3 | 527 | rdrand_works_p(OP_RDRAND)); |
b9b279b4 | 528 | CASE_CPUFEAT(X86_AVX, "x86:avx", |
0ed9f882 | 529 | cpuid_feature_p(CPUID_1_C, CPUID1C_AVX) && |
6af2607b | 530 | xmm_registers_available_p()); |
9e6a4409 | 531 | CASE_CPUFEAT(X86_SSSE3, "x86:ssse3", |
0ed9f882 | 532 | cpuid_feature_p(CPUID_1_C, CPUID1C_SSSE3) && |
6af2607b | 533 | xmm_registers_available_p()); |
9e6a4409 | 534 | CASE_CPUFEAT(X86_PCLMUL, "x86:pclmul", |
0ed9f882 | 535 | cpuid_feature_p(CPUID_1_C, CPUID1C_PCLMUL) && |
6af2607b | 536 | xmm_registers_available_p()); |
6c0946ef MW |
537 | CASE_CPUFEAT(X86_RDSEED, "x86:rdseed", |
538 | cpuid_feature_p(CPUID_7_0_B, CPUID70B_RDSEED) && | |
539 | rdrand_works_p(OP_RDSEED)); | |
a02a22d4 MW |
540 | #endif |
541 | #ifdef CAPMAP | |
542 | # define FEATP__CASE(feat, tok) \ | |
0aec0658 | 543 | CASE_CPUFEAT(feat, tok, get_hwcaps() & HF_##feat) |
a02a22d4 MW |
544 | CAPMAP(FEATP__CASE) |
545 | #undef FEATP__CASE | |
08e2be29 MW |
546 | #endif |
547 | default: | |
fac645f7 | 548 | dispatch_debug("denying unknown feature %d", feat); |
08e2be29 MW |
549 | return (0); |
550 | } | |
fac645f7 | 551 | #undef CASE_CPUFEAT |
08e2be29 MW |
552 | } |
553 | ||
554 | /*----- That's all, folks -------------------------------------------------*/ |