1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2015, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.hpp"
28 #include "asm/macroAssembler.inline.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "runtime/java.hpp"
31 #include "runtime/stubCodeGenerator.hpp"
32 #include "utilities/macros.hpp"
33 #include "vm_version_aarch64.hpp"
34
35 #include OS_HEADER_INLINE(os)
36
37 #include <sys/auxv.h>
38 #include <asm/hwcap.h>
39
40 #ifndef HWCAP_AES
41 #define HWCAP_AES (1<<3)
42 #endif
43
44 #ifndef HWCAP_PMULL
45 #define HWCAP_PMULL (1<<4)
46 #endif
47
48 #ifndef HWCAP_SHA1
49 #define HWCAP_SHA1 (1<<5)
50 #endif
51
52 #ifndef HWCAP_SHA2
53 #define HWCAP_SHA2 (1<<6)
54 #endif
55
56 #ifndef HWCAP_CRC32
57 #define HWCAP_CRC32 (1<<7)
58 #endif
59
60 #ifndef HWCAP_ATOMICS
61 #define HWCAP_ATOMICS (1<<8)
62 #endif
63
64 int VM_Version::_cpu;
65 int VM_Version::_model;
66 int VM_Version::_model2;
67 int VM_Version::_variant;
68 int VM_Version::_revision;
69 int VM_Version::_stepping;
70 VM_Version::PsrInfo VM_Version::_psr_info = { 0, };
71
72 static BufferBlob* stub_blob;
73 static const int stub_size = 550;
74
75 extern "C" {
76 typedef void (*getPsrInfo_stub_t)(void*);
77 }
78 static getPsrInfo_stub_t getPsrInfo_stub = NULL;
79
80
81 class VM_Version_StubGenerator: public StubCodeGenerator {
82 public:
83
84 VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
85
86 address generate_getPsrInfo() {
87 StubCodeMark mark(this, "VM_Version", "getPsrInfo_stub");
88 # define __ _masm->
89 address start = __ pc();
90
91 // void getPsrInfo(VM_Version::PsrInfo* psr_info);
92
93 address entry = __ pc();
94
95 __ enter();
96
97 __ get_dczid_el0(rscratch1);
98 __ strw(rscratch1, Address(c_rarg0, in_bytes(VM_Version::dczid_el0_offset())));
99
100 __ get_ctr_el0(rscratch1);
101 __ strw(rscratch1, Address(c_rarg0, in_bytes(VM_Version::ctr_el0_offset())));
102
103 __ leave();
104 __ ret(lr);
105
106 # undef __
107
108 return start;
109 }
110 };
111
112
113 void VM_Version::get_processor_features() {
114 _supports_cx8 = true;
115 _supports_atomic_getset4 = true;
116 _supports_atomic_getadd4 = true;
117 _supports_atomic_getset8 = true;
118 _supports_atomic_getadd8 = true;
119
120 getPsrInfo_stub(&_psr_info);
121
122 int dcache_line = VM_Version::dcache_line_size();
123
124 // Limit AllocatePrefetchDistance so that it does not exceed the
125 // constraint in AllocatePrefetchDistanceConstraintFunc.
126 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance))
127 FLAG_SET_DEFAULT(AllocatePrefetchDistance, MIN2(512, 3*dcache_line));
128
129 if (FLAG_IS_DEFAULT(AllocatePrefetchStepSize))
130 FLAG_SET_DEFAULT(AllocatePrefetchStepSize, dcache_line);
131 if (FLAG_IS_DEFAULT(PrefetchScanIntervalInBytes))
132 FLAG_SET_DEFAULT(PrefetchScanIntervalInBytes, 3*dcache_line);
133 if (FLAG_IS_DEFAULT(PrefetchCopyIntervalInBytes))
134 FLAG_SET_DEFAULT(PrefetchCopyIntervalInBytes, 3*dcache_line);
135 if (FLAG_IS_DEFAULT(SoftwarePrefetchHintDistance))
136 FLAG_SET_DEFAULT(SoftwarePrefetchHintDistance, 3*dcache_line);
137
138 if (PrefetchCopyIntervalInBytes != -1 &&
139 ((PrefetchCopyIntervalInBytes & 7) || (PrefetchCopyIntervalInBytes >= 32768))) {
140 warning("PrefetchCopyIntervalInBytes must be -1, or a multiple of 8 and < 32768");
141 PrefetchCopyIntervalInBytes &= ~7;
142 if (PrefetchCopyIntervalInBytes >= 32768)
143 PrefetchCopyIntervalInBytes = 32760;
144 }
145
146 if (AllocatePrefetchDistance !=-1 && (AllocatePrefetchDistance & 7)) {
147 warning("AllocatePrefetchDistance must be multiple of 8");
148 AllocatePrefetchDistance &= ~7;
149 }
150
151 if (AllocatePrefetchStepSize & 7) {
152 warning("AllocatePrefetchStepSize must be multiple of 8");
153 AllocatePrefetchStepSize &= ~7;
154 }
155
156 if (SoftwarePrefetchHintDistance != -1 &&
157 (SoftwarePrefetchHintDistance & 7)) {
158 warning("SoftwarePrefetchHintDistance must be -1, or a multiple of 8");
159 SoftwarePrefetchHintDistance &= ~7;
160 }
161
162 unsigned long auxv = getauxval(AT_HWCAP);
163
164 char buf[512];
165
166 _features = auxv;
167
168 int cpu_lines = 0;
169 if (FILE *f = fopen("/proc/cpuinfo", "r")) {
170 char buf[128], *p;
171 while (fgets(buf, sizeof (buf), f) != NULL) {
172 if ((p = strchr(buf, ':')) != NULL) {
173 long v = strtol(p+1, NULL, 0);
174 if (strncmp(buf, "CPU implementer", sizeof "CPU implementer" - 1) == 0) {
175 _cpu = v;
176 cpu_lines++;
177 } else if (strncmp(buf, "CPU variant", sizeof "CPU variant" - 1) == 0) {
178 _variant = v;
179 } else if (strncmp(buf, "CPU part", sizeof "CPU part" - 1) == 0) {
180 if (_model != v) _model2 = _model;
181 _model = v;
182 } else if (strncmp(buf, "CPU revision", sizeof "CPU revision" - 1) == 0) {
183 _revision = v;
184 }
185 }
186 }
187 fclose(f);
188 }
189
190 // Enable vendor specific features
191
192 // ThunderX
193 if (_cpu == CPU_CAVIUM && (_model == 0xA1)) {
194 if (_variant == 0) _features |= CPU_DMB_ATOMICS;
195 if (FLAG_IS_DEFAULT(AvoidUnalignedAccesses)) {
196 FLAG_SET_DEFAULT(AvoidUnalignedAccesses, true);
197 }
198 if (FLAG_IS_DEFAULT(UseSIMDForMemoryOps)) {
199 FLAG_SET_DEFAULT(UseSIMDForMemoryOps, (_variant > 0));
200 }
201 if (FLAG_IS_DEFAULT(UseSIMDForArrayEquals)) {
202 FLAG_SET_DEFAULT(UseSIMDForArrayEquals, false);
203 }
204 }
205
206 // ThunderX2
207 if ((_cpu == CPU_CAVIUM && (_model == 0xAF)) ||
208 (_cpu == CPU_BROADCOM && (_model == 0x516))) {
209 if (FLAG_IS_DEFAULT(AvoidUnalignedAccesses)) {
210 FLAG_SET_DEFAULT(AvoidUnalignedAccesses, true);
211 }
212 if (FLAG_IS_DEFAULT(UseSIMDForMemoryOps)) {
213 FLAG_SET_DEFAULT(UseSIMDForMemoryOps, true);
214 }
215 #ifdef COMPILER2
216 if (FLAG_IS_DEFAULT(UseFPUForSpilling)) {
217 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
218 }
219 #endif
220 }
221
222 // Cortex A53
223 if (_cpu == CPU_ARM && (_model == 0xd03 || _model2 == 0xd03)) {
224 _features |= CPU_A53MAC;
225 if (FLAG_IS_DEFAULT(UseSIMDForArrayEquals)) {
226 FLAG_SET_DEFAULT(UseSIMDForArrayEquals, false);
227 }
228 }
229
230 // Cortex A73
231 if (_cpu == CPU_ARM && (_model == 0xd09 || _model2 == 0xd09)) {
232 if (FLAG_IS_DEFAULT(SoftwarePrefetchHintDistance)) {
233 FLAG_SET_DEFAULT(SoftwarePrefetchHintDistance, -1);
234 }
235 // A73 is faster with short-and-easy-for-speculative-execution-loop
236 if (FLAG_IS_DEFAULT(UseSimpleArrayEquals)) {
237 FLAG_SET_DEFAULT(UseSimpleArrayEquals, true);
238 }
239 }
240
241 // Neoverse N1
242 if (_cpu == CPU_ARM && (_model == 0xd0c || _model2 == 0xd0c)) {
243 if (FLAG_IS_DEFAULT(UseSIMDForMemoryOps)) {
244 FLAG_SET_DEFAULT(UseSIMDForMemoryOps, true);
245 }
246 }
247
248 if (_cpu == CPU_ARM && (_model == 0xd07 || _model2 == 0xd07)) _features |= CPU_STXR_PREFETCH;
249 // If an olde style /proc/cpuinfo (cpu_lines == 1) then if _model is an A57 (0xd07)
250 // we assume the worst and assume we could be on a big little system and have
251 // undisclosed A53 cores which we could be swapped to at any stage
252 if (_cpu == CPU_ARM && cpu_lines == 1 && _model == 0xd07) _features |= CPU_A53MAC;
253
254 sprintf(buf, "0x%02x:0x%x:0x%03x:%d", _cpu, _variant, _model, _revision);
255 if (_model2) sprintf(buf+strlen(buf), "(0x%03x)", _model2);
256 if (auxv & HWCAP_ASIMD) strcat(buf, ", simd");
257 if (auxv & HWCAP_CRC32) strcat(buf, ", crc");
258 if (auxv & HWCAP_AES) strcat(buf, ", aes");
259 if (auxv & HWCAP_SHA1) strcat(buf, ", sha1");
260 if (auxv & HWCAP_SHA2) strcat(buf, ", sha256");
261 if (auxv & HWCAP_ATOMICS) strcat(buf, ", lse");
262
263 _features_string = os::strdup(buf);
264
265 if (FLAG_IS_DEFAULT(UseCRC32)) {
266 UseCRC32 = (auxv & HWCAP_CRC32) != 0;
267 }
268
269 if (UseCRC32 && (auxv & HWCAP_CRC32) == 0) {
270 warning("UseCRC32 specified, but not supported on this CPU");
271 FLAG_SET_DEFAULT(UseCRC32, false);
272 }
273
274 if (FLAG_IS_DEFAULT(UseAdler32Intrinsics)) {
275 FLAG_SET_DEFAULT(UseAdler32Intrinsics, true);
276 }
277
278 if (UseVectorizedMismatchIntrinsic) {
279 warning("UseVectorizedMismatchIntrinsic specified, but not available on this CPU.");
280 FLAG_SET_DEFAULT(UseVectorizedMismatchIntrinsic, false);
281 }
282
283 if (auxv & HWCAP_ATOMICS) {
284 if (FLAG_IS_DEFAULT(UseLSE))
285 FLAG_SET_DEFAULT(UseLSE, true);
286 } else {
287 if (UseLSE) {
288 warning("UseLSE specified, but not supported on this CPU");
289 FLAG_SET_DEFAULT(UseLSE, false);
290 }
291 }
292
293 if (auxv & HWCAP_AES) {
294 UseAES = UseAES || FLAG_IS_DEFAULT(UseAES);
295 UseAESIntrinsics =
296 UseAESIntrinsics || (UseAES && FLAG_IS_DEFAULT(UseAESIntrinsics));
297 if (UseAESIntrinsics && !UseAES) {
298 warning("UseAESIntrinsics enabled, but UseAES not, enabling");
299 UseAES = true;
300 }
301 } else {
302 if (UseAES) {
303 warning("AES instructions are not available on this CPU");
304 FLAG_SET_DEFAULT(UseAES, false);
305 }
306 if (UseAESIntrinsics) {
307 warning("AES intrinsics are not available on this CPU");
308 FLAG_SET_DEFAULT(UseAESIntrinsics, false);
309 }
310 }
311
312 if (UseAESCTRIntrinsics) {
313 warning("AES/CTR intrinsics are not available on this CPU");
314 FLAG_SET_DEFAULT(UseAESCTRIntrinsics, false);
315 }
316
317 if (FLAG_IS_DEFAULT(UseCRC32Intrinsics)) {
318 UseCRC32Intrinsics = true;
319 }
320
321 if (auxv & HWCAP_CRC32) {
322 if (FLAG_IS_DEFAULT(UseCRC32CIntrinsics)) {
323 FLAG_SET_DEFAULT(UseCRC32CIntrinsics, true);
324 }
325 } else if (UseCRC32CIntrinsics) {
326 warning("CRC32C is not available on the CPU");
327 FLAG_SET_DEFAULT(UseCRC32CIntrinsics, false);
328 }
329
330 if (FLAG_IS_DEFAULT(UseFMA)) {
331 FLAG_SET_DEFAULT(UseFMA, true);
332 }
333
334 if (auxv & (HWCAP_SHA1 | HWCAP_SHA2)) {
335 if (FLAG_IS_DEFAULT(UseSHA)) {
336 FLAG_SET_DEFAULT(UseSHA, true);
337 }
338 } else if (UseSHA) {
339 warning("SHA instructions are not available on this CPU");
340 FLAG_SET_DEFAULT(UseSHA, false);
341 }
342
343 if (UseSHA && (auxv & HWCAP_SHA1)) {
344 if (FLAG_IS_DEFAULT(UseSHA1Intrinsics)) {
345 FLAG_SET_DEFAULT(UseSHA1Intrinsics, true);
346 }
347 } else if (UseSHA1Intrinsics) {
348 warning("Intrinsics for SHA-1 crypto hash functions not available on this CPU.");
349 FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);
350 }
351
352 if (UseSHA && (auxv & HWCAP_SHA2)) {
353 if (FLAG_IS_DEFAULT(UseSHA256Intrinsics)) {
354 FLAG_SET_DEFAULT(UseSHA256Intrinsics, true);
355 }
356 } else if (UseSHA256Intrinsics) {
357 warning("Intrinsics for SHA-224 and SHA-256 crypto hash functions not available on this CPU.");
358 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);
359 }
360
361 if (UseSHA512Intrinsics) {
362 warning("Intrinsics for SHA-384 and SHA-512 crypto hash functions not available on this CPU.");
363 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
364 }
365
366 if (!(UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics)) {
367 FLAG_SET_DEFAULT(UseSHA, false);
368 }
369
370 if (auxv & HWCAP_PMULL) {
371 if (FLAG_IS_DEFAULT(UseGHASHIntrinsics)) {
372 FLAG_SET_DEFAULT(UseGHASHIntrinsics, true);
373 }
374 } else if (UseGHASHIntrinsics) {
375 warning("GHASH intrinsics are not available on this CPU");
376 FLAG_SET_DEFAULT(UseGHASHIntrinsics, false);
377 }
378
379 if (is_zva_enabled()) {
380 if (FLAG_IS_DEFAULT(UseBlockZeroing)) {
381 FLAG_SET_DEFAULT(UseBlockZeroing, true);
382 }
383 if (FLAG_IS_DEFAULT(BlockZeroingLowLimit)) {
384 FLAG_SET_DEFAULT(BlockZeroingLowLimit, 4 * VM_Version::zva_length());
385 }
386 } else if (UseBlockZeroing) {
387 warning("DC ZVA is not available on this CPU");
388 FLAG_SET_DEFAULT(UseBlockZeroing, false);
389 }
390
391 // This machine allows unaligned memory accesses
392 if (FLAG_IS_DEFAULT(UseUnalignedAccesses)) {
393 FLAG_SET_DEFAULT(UseUnalignedAccesses, true);
394 }
395
396 if (FLAG_IS_DEFAULT(UseBarriersForVolatile)) {
397 UseBarriersForVolatile = (_features & CPU_DMB_ATOMICS) != 0;
398 }
399
400 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
401 UsePopCountInstruction = true;
402 }
403
404 #ifdef COMPILER2
405 if (FLAG_IS_DEFAULT(UseMultiplyToLenIntrinsic)) {
406 UseMultiplyToLenIntrinsic = true;
407 }
408
409 if (FLAG_IS_DEFAULT(UseSquareToLenIntrinsic)) {
410 UseSquareToLenIntrinsic = true;
411 }
412
413 if (FLAG_IS_DEFAULT(UseMulAddIntrinsic)) {
414 UseMulAddIntrinsic = true;
415 }
416
417 if (FLAG_IS_DEFAULT(UseMontgomeryMultiplyIntrinsic)) {
418 UseMontgomeryMultiplyIntrinsic = true;
419 }
420 if (FLAG_IS_DEFAULT(UseMontgomerySquareIntrinsic)) {
421 UseMontgomerySquareIntrinsic = true;
422 }
423
424 if (FLAG_IS_DEFAULT(OptoScheduling)) {
425 OptoScheduling = true;
426 }
427 #endif
428 }
429
430 void VM_Version::initialize() {
431 ResourceMark rm;
432
433 stub_blob = BufferBlob::create("getPsrInfo_stub", stub_size);
434 if (stub_blob == NULL) {
435 vm_exit_during_initialization("Unable to allocate getPsrInfo_stub");
436 }
437
438 CodeBuffer c(stub_blob);
439 VM_Version_StubGenerator g(&c);
440 getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t,
441 g.generate_getPsrInfo());
442
443 get_processor_features();
444
445 UNSUPPORTED_OPTION(CriticalJNINatives);
446 }