1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "runtime/java.hpp"
30 #include "runtime/os.hpp"
31 #include "runtime/stubCodeGenerator.hpp"
32 #include "vm_version_x86.hpp"
33
34
35 int VM_Version::_cpu;
36 int VM_Version::_model;
37 int VM_Version::_stepping;
38 int VM_Version::_cpuFeatures;
39 const char* VM_Version::_features_str = "";
40 VM_Version::CpuidInfo VM_Version::_cpuid_info = { 0, };
41
42 // Address of instruction which causes SEGV
43 address VM_Version::_cpuinfo_segv_addr = 0;
44 // Address of instruction after the one which causes SEGV
45 address VM_Version::_cpuinfo_cont_addr = 0;
46
47 static BufferBlob* stub_blob;
48 static const int stub_size = 600;
49
50 extern "C" {
51 typedef void (*get_cpu_info_stub_t)(void*);
52 }
53 static get_cpu_info_stub_t get_cpu_info_stub = NULL;
54
55
56 class VM_Version_StubGenerator: public StubCodeGenerator {
57 public:
58
59 VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
60
61 address generate_get_cpu_info() {
62 // Flags to test CPU type.
63 const uint32_t HS_EFL_AC = 0x40000;
64 const uint32_t HS_EFL_ID = 0x200000;
65 // Values for when we don't have a CPUID instruction.
66 const int CPU_FAMILY_SHIFT = 8;
67 const uint32_t CPU_FAMILY_386 = (3 << CPU_FAMILY_SHIFT);
68 const uint32_t CPU_FAMILY_486 = (4 << CPU_FAMILY_SHIFT);
69
70 Label detect_486, cpu486, detect_586, std_cpuid1, std_cpuid4;
71 Label sef_cpuid, ext_cpuid, ext_cpuid1, ext_cpuid5, ext_cpuid7, done;
72
73 StubCodeMark mark(this, "VM_Version", "get_cpu_info_stub");
74 # define __ _masm->
75
76 address start = __ pc();
77
78 //
79 // void get_cpu_info(VM_Version::CpuidInfo* cpuid_info);
80 //
81 // LP64: rcx and rdx are first and second argument registers on windows
82
83 __ push(rbp);
84 #ifdef _LP64
85 __ mov(rbp, c_rarg0); // cpuid_info address
86 #else
87 __ movptr(rbp, Address(rsp, 8)); // cpuid_info address
88 #endif
89 __ push(rbx);
90 __ push(rsi);
91 __ pushf(); // preserve rbx, and flags
92 __ pop(rax);
93 __ push(rax);
94 __ mov(rcx, rax);
95 //
96 // if we are unable to change the AC flag, we have a 386
97 //
98 __ xorl(rax, HS_EFL_AC);
99 __ push(rax);
100 __ popf();
101 __ pushf();
102 __ pop(rax);
103 __ cmpptr(rax, rcx);
104 __ jccb(Assembler::notEqual, detect_486);
105
106 __ movl(rax, CPU_FAMILY_386);
107 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
108 __ jmp(done);
109
110 //
111 // If we are unable to change the ID flag, we have a 486 which does
112 // not support the "cpuid" instruction.
113 //
114 __ bind(detect_486);
115 __ mov(rax, rcx);
116 __ xorl(rax, HS_EFL_ID);
117 __ push(rax);
118 __ popf();
119 __ pushf();
120 __ pop(rax);
121 __ cmpptr(rcx, rax);
122 __ jccb(Assembler::notEqual, detect_586);
123
124 __ bind(cpu486);
125 __ movl(rax, CPU_FAMILY_486);
126 __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax);
127 __ jmp(done);
128
129 //
130 // At this point, we have a chip which supports the "cpuid" instruction
131 //
132 __ bind(detect_586);
133 __ xorl(rax, rax);
134 __ cpuid();
135 __ orl(rax, rax);
136 __ jcc(Assembler::equal, cpu486); // if cpuid doesn't support an input
137 // value of at least 1, we give up and
138 // assume a 486
139 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset())));
140 __ movl(Address(rsi, 0), rax);
141 __ movl(Address(rsi, 4), rbx);
142 __ movl(Address(rsi, 8), rcx);
143 __ movl(Address(rsi,12), rdx);
144
145 __ cmpl(rax, 0xa); // Is cpuid(0xB) supported?
146 __ jccb(Assembler::belowEqual, std_cpuid4);
147
148 //
149 // cpuid(0xB) Processor Topology
150 //
151 __ movl(rax, 0xb);
152 __ xorl(rcx, rcx); // Threads level
153 __ cpuid();
154
155 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB0_offset())));
156 __ movl(Address(rsi, 0), rax);
157 __ movl(Address(rsi, 4), rbx);
158 __ movl(Address(rsi, 8), rcx);
159 __ movl(Address(rsi,12), rdx);
160
161 __ movl(rax, 0xb);
162 __ movl(rcx, 1); // Cores level
163 __ cpuid();
164 __ push(rax);
165 __ andl(rax, 0x1f); // Determine if valid topology level
166 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
167 __ andl(rax, 0xffff);
168 __ pop(rax);
169 __ jccb(Assembler::equal, std_cpuid4);
170
171 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB1_offset())));
172 __ movl(Address(rsi, 0), rax);
173 __ movl(Address(rsi, 4), rbx);
174 __ movl(Address(rsi, 8), rcx);
175 __ movl(Address(rsi,12), rdx);
176
177 __ movl(rax, 0xb);
178 __ movl(rcx, 2); // Packages level
179 __ cpuid();
180 __ push(rax);
181 __ andl(rax, 0x1f); // Determine if valid topology level
182 __ orl(rax, rbx); // eax[4:0] | ebx[0:15] == 0 indicates invalid level
183 __ andl(rax, 0xffff);
184 __ pop(rax);
185 __ jccb(Assembler::equal, std_cpuid4);
186
187 __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB2_offset())));
188 __ movl(Address(rsi, 0), rax);
189 __ movl(Address(rsi, 4), rbx);
190 __ movl(Address(rsi, 8), rcx);
191 __ movl(Address(rsi,12), rdx);
192
193 //
194 // cpuid(0x4) Deterministic cache params
195 //
196 __ bind(std_cpuid4);
197 __ movl(rax, 4);
198 __ cmpl(rax, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); // Is cpuid(0x4) supported?
199 __ jccb(Assembler::greater, std_cpuid1);
200
201 __ xorl(rcx, rcx); // L1 cache
202 __ cpuid();
203 __ push(rax);
204 __ andl(rax, 0x1f); // Determine if valid cache parameters used
205 __ orl(rax, rax); // eax[4:0] == 0 indicates invalid cache
206 __ pop(rax);
207 __ jccb(Assembler::equal, std_cpuid1);
208
209 __ lea(rsi, Address(rbp, in_bytes(VM_Version::dcp_cpuid4_offset())));
210 __ movl(Address(rsi, 0), rax);
211 __ movl(Address(rsi, 4), rbx);
212 __ movl(Address(rsi, 8), rcx);
213 __ movl(Address(rsi,12), rdx);
214
215 //
216 // Standard cpuid(0x1)
217 //
218 __ bind(std_cpuid1);
219 __ movl(rax, 1);
220 __ cpuid();
221 __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())));
222 __ movl(Address(rsi, 0), rax);
223 __ movl(Address(rsi, 4), rbx);
224 __ movl(Address(rsi, 8), rcx);
225 __ movl(Address(rsi,12), rdx);
226
227 //
228 // Check if OS has enabled XGETBV instruction to access XCR0
229 // (OSXSAVE feature flag) and CPU supports AVX
230 //
231 __ andl(rcx, 0x18000000); // cpuid1 bits osxsave | avx
232 __ cmpl(rcx, 0x18000000);
233 __ jccb(Assembler::notEqual, sef_cpuid); // jump if AVX is not supported
234
235 //
236 // XCR0, XFEATURE_ENABLED_MASK register
237 //
238 __ xorl(rcx, rcx); // zero for XCR0 register
239 __ xgetbv();
240 __ lea(rsi, Address(rbp, in_bytes(VM_Version::xem_xcr0_offset())));
241 __ movl(Address(rsi, 0), rax);
242 __ movl(Address(rsi, 4), rdx);
243
244 __ andl(rax, 0x6); // xcr0 bits sse | ymm
245 __ cmpl(rax, 0x6);
246 __ jccb(Assembler::notEqual, sef_cpuid); // jump if AVX is not supported
247
248 //
249 // Some OSs have a bug when upper 128bits of YMM
250 // registers are not restored after a signal processing.
251 // Generate SEGV here (reference through NULL)
252 // and check upper YMM bits after it.
253 //
254 VM_Version::set_avx_cpuFeatures(); // Enable temporary to pass asserts
255 intx saved_useavx = UseAVX;
256 intx saved_usesse = UseSSE;
257 UseAVX = 1;
258 UseSSE = 2;
259
260 // load value into all 32 bytes of ymm7 register
261 __ movl(rcx, VM_Version::ymm_test_value());
262
263 __ movdl(xmm0, rcx);
264 __ pshufd(xmm0, xmm0, 0x00);
265 __ vinsertf128h(xmm0, xmm0, xmm0);
266 __ vmovdqu(xmm7, xmm0);
267 #ifdef _LP64
268 __ vmovdqu(xmm8, xmm0);
269 __ vmovdqu(xmm15, xmm0);
270 #endif
271
272 __ xorl(rsi, rsi);
273 VM_Version::set_cpuinfo_segv_addr( __ pc() );
274 // Generate SEGV
275 __ movl(rax, Address(rsi, 0));
276
277 VM_Version::set_cpuinfo_cont_addr( __ pc() );
278 // Returns here after signal. Save xmm0 to check it later.
279 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ymm_save_offset())));
280 __ vmovdqu(Address(rsi, 0), xmm0);
281 __ vmovdqu(Address(rsi, 32), xmm7);
282 #ifdef _LP64
283 __ vmovdqu(Address(rsi, 64), xmm8);
284 __ vmovdqu(Address(rsi, 96), xmm15);
285 #endif
286
287 VM_Version::clean_cpuFeatures();
288 UseAVX = saved_useavx;
289 UseSSE = saved_usesse;
290
291 //
292 // cpuid(0x7) Structured Extended Features
293 //
294 __ bind(sef_cpuid);
295 __ movl(rax, 7);
296 __ cmpl(rax, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); // Is cpuid(0x7) supported?
297 __ jccb(Assembler::greater, ext_cpuid);
298
299 __ xorl(rcx, rcx);
300 __ cpuid();
301 __ lea(rsi, Address(rbp, in_bytes(VM_Version::sef_cpuid7_offset())));
302 __ movl(Address(rsi, 0), rax);
303 __ movl(Address(rsi, 4), rbx);
304
305 //
306 // Extended cpuid(0x80000000)
307 //
308 __ bind(ext_cpuid);
309 __ movl(rax, 0x80000000);
310 __ cpuid();
311 __ cmpl(rax, 0x80000000); // Is cpuid(0x80000001) supported?
312 __ jcc(Assembler::belowEqual, done);
313 __ cmpl(rax, 0x80000004); // Is cpuid(0x80000005) supported?
314 __ jccb(Assembler::belowEqual, ext_cpuid1);
315 __ cmpl(rax, 0x80000006); // Is cpuid(0x80000007) supported?
316 __ jccb(Assembler::belowEqual, ext_cpuid5);
317 __ cmpl(rax, 0x80000007); // Is cpuid(0x80000008) supported?
318 __ jccb(Assembler::belowEqual, ext_cpuid7);
319 //
320 // Extended cpuid(0x80000008)
321 //
322 __ movl(rax, 0x80000008);
323 __ cpuid();
324 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid8_offset())));
325 __ movl(Address(rsi, 0), rax);
326 __ movl(Address(rsi, 4), rbx);
327 __ movl(Address(rsi, 8), rcx);
328 __ movl(Address(rsi,12), rdx);
329
330 //
331 // Extended cpuid(0x80000007)
332 //
333 __ bind(ext_cpuid7);
334 __ movl(rax, 0x80000007);
335 __ cpuid();
336 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid7_offset())));
337 __ movl(Address(rsi, 0), rax);
338 __ movl(Address(rsi, 4), rbx);
339 __ movl(Address(rsi, 8), rcx);
340 __ movl(Address(rsi,12), rdx);
341
342 //
343 // Extended cpuid(0x80000005)
344 //
345 __ bind(ext_cpuid5);
346 __ movl(rax, 0x80000005);
347 __ cpuid();
348 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid5_offset())));
349 __ movl(Address(rsi, 0), rax);
350 __ movl(Address(rsi, 4), rbx);
351 __ movl(Address(rsi, 8), rcx);
352 __ movl(Address(rsi,12), rdx);
353
354 //
355 // Extended cpuid(0x80000001)
356 //
357 __ bind(ext_cpuid1);
358 __ movl(rax, 0x80000001);
359 __ cpuid();
360 __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid1_offset())));
361 __ movl(Address(rsi, 0), rax);
362 __ movl(Address(rsi, 4), rbx);
363 __ movl(Address(rsi, 8), rcx);
364 __ movl(Address(rsi,12), rdx);
365
366 //
367 // return
368 //
369 __ bind(done);
370 __ popf();
371 __ pop(rsi);
372 __ pop(rbx);
373 __ pop(rbp);
374 __ ret(0);
375
376 # undef __
377
378 return start;
379 };
380 };
381
382
383 void VM_Version::get_cpu_info_wrapper() {
384 get_cpu_info_stub(&_cpuid_info);
385 }
386
387 #ifndef CALL_TEST_FUNC_WITH_WRAPPER_IF_NEEDED
388 #define CALL_TEST_FUNC_WITH_WRAPPER_IF_NEEDED(f) f()
389 #endif
390
391 void VM_Version::get_processor_features() {
392
393 _cpu = 4; // 486 by default
394 _model = 0;
395 _stepping = 0;
396 _cpuFeatures = 0;
397 _logical_processors_per_package = 1;
398 // i486 internal cache is both I&D and has a 16-byte line size
399 _L1_data_cache_line_size = 16;
400
401 if (!Use486InstrsOnly) {
402 // Get raw processor info
403
404 // Some platforms (like Win*) need a wrapper around here
405 // in order to properly handle SEGV for YMM registers test.
406 CALL_TEST_FUNC_WITH_WRAPPER_IF_NEEDED(get_cpu_info_wrapper);
407
408 assert_is_initialized();
409 _cpu = extended_cpu_family();
410 _model = extended_cpu_model();
411 _stepping = cpu_stepping();
412
413 if (cpu_family() > 4) { // it supports CPUID
414 _cpuFeatures = feature_flags();
415 // Logical processors are only available on P4s and above,
416 // and only if hyperthreading is available.
417 _logical_processors_per_package = logical_processor_count();
418 _L1_data_cache_line_size = L1_line_size();
419 }
420 }
421
422 _supports_cx8 = supports_cmpxchg8();
423 // xchg and xadd instructions
424 _supports_atomic_getset4 = true;
425 _supports_atomic_getadd4 = true;
426 LP64_ONLY(_supports_atomic_getset8 = true);
427 LP64_ONLY(_supports_atomic_getadd8 = true);
428
429 #ifdef _LP64
430 // OS should support SSE for x64 and hardware should support at least SSE2.
431 if (!VM_Version::supports_sse2()) {
432 vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported");
433 }
434 // in 64 bit the use of SSE2 is the minimum
435 if (UseSSE < 2) UseSSE = 2;
436 #endif
437
438 #ifdef AMD64
439 // flush_icache_stub have to be generated first.
440 // That is why Icache line size is hard coded in ICache class,
441 // see icache_x86.hpp. It is also the reason why we can't use
442 // clflush instruction in 32-bit VM since it could be running
443 // on CPU which does not support it.
444 //
445 // The only thing we can do is to verify that flushed
446 // ICache::line_size has correct value.
447 guarantee(_cpuid_info.std_cpuid1_edx.bits.clflush != 0, "clflush is not supported");
448 // clflush_size is size in quadwords (8 bytes).
449 guarantee(_cpuid_info.std_cpuid1_ebx.bits.clflush_size == 8, "such clflush size is not supported");
450 #endif
451
452 // If the OS doesn't support SSE, we can't use this feature even if the HW does
453 if (!os::supports_sse())
454 _cpuFeatures &= ~(CPU_SSE|CPU_SSE2|CPU_SSE3|CPU_SSSE3|CPU_SSE4A|CPU_SSE4_1|CPU_SSE4_2);
455
456 if (UseSSE < 4) {
457 _cpuFeatures &= ~CPU_SSE4_1;
458 _cpuFeatures &= ~CPU_SSE4_2;
459 }
460
461 if (UseSSE < 3) {
462 _cpuFeatures &= ~CPU_SSE3;
463 _cpuFeatures &= ~CPU_SSSE3;
464 _cpuFeatures &= ~CPU_SSE4A;
465 }
466
467 if (UseSSE < 2)
468 _cpuFeatures &= ~CPU_SSE2;
469
470 if (UseSSE < 1)
471 _cpuFeatures &= ~CPU_SSE;
472
473 if (UseAVX < 2)
474 _cpuFeatures &= ~CPU_AVX2;
475
476 if (UseAVX < 1)
477 _cpuFeatures &= ~CPU_AVX;
478
479 if (!UseAES && !FLAG_IS_DEFAULT(UseAES))
480 _cpuFeatures &= ~CPU_AES;
481
482 if (logical_processors_per_package() == 1) {
483 // HT processor could be installed on a system which doesn't support HT.
484 _cpuFeatures &= ~CPU_HT;
485 }
486
487 char buf[256];
488 jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
489 cores_per_cpu(), threads_per_core(),
490 cpu_family(), _model, _stepping,
491 (supports_cmov() ? ", cmov" : ""),
492 (supports_cmpxchg8() ? ", cx8" : ""),
493 (supports_fxsr() ? ", fxsr" : ""),
494 (supports_mmx() ? ", mmx" : ""),
495 (supports_sse() ? ", sse" : ""),
496 (supports_sse2() ? ", sse2" : ""),
497 (supports_sse3() ? ", sse3" : ""),
498 (supports_ssse3()? ", ssse3": ""),
499 (supports_sse4_1() ? ", sse4.1" : ""),
500 (supports_sse4_2() ? ", sse4.2" : ""),
501 (supports_popcnt() ? ", popcnt" : ""),
502 (supports_avx() ? ", avx" : ""),
503 (supports_avx2() ? ", avx2" : ""),
504 (supports_aes() ? ", aes" : ""),
505 (supports_clmul() ? ", clmul" : ""),
506 (supports_erms() ? ", erms" : ""),
507 (supports_rtm() ? ", rtm" : ""),
508 (supports_mmx_ext() ? ", mmxext" : ""),
509 (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
510 (supports_lzcnt() ? ", lzcnt": ""),
511 (supports_sse4a() ? ", sse4a": ""),
512 (supports_ht() ? ", ht": ""),
513 (supports_tsc() ? ", tsc": ""),
514 (supports_tscinv_bit() ? ", tscinvbit": ""),
515 (supports_tscinv() ? ", tscinv": ""),
516 (supports_bmi1() ? ", bmi1" : ""),
517 (supports_bmi2() ? ", bmi2" : ""),
518 (supports_adx() ? ", adx" : ""));
519 _features_str = os::strdup(buf);
520
521 // UseSSE is set to the smaller of what hardware supports and what
522 // the command line requires. I.e., you cannot set UseSSE to 2 on
523 // older Pentiums which do not support it.
524 if (UseSSE > 4) UseSSE=4;
525 if (UseSSE < 0) UseSSE=0;
526 if (!supports_sse4_1()) // Drop to 3 if no SSE4 support
527 UseSSE = MIN2((intx)3,UseSSE);
528 if (!supports_sse3()) // Drop to 2 if no SSE3 support
529 UseSSE = MIN2((intx)2,UseSSE);
530 if (!supports_sse2()) // Drop to 1 if no SSE2 support
531 UseSSE = MIN2((intx)1,UseSSE);
532 if (!supports_sse ()) // Drop to 0 if no SSE support
533 UseSSE = 0;
534
535 if (UseAVX > 2) UseAVX=2;
536 if (UseAVX < 0) UseAVX=0;
537 if (!supports_avx2()) // Drop to 1 if no AVX2 support
538 UseAVX = MIN2((intx)1,UseAVX);
539 if (!supports_avx ()) // Drop to 0 if no AVX support
540 UseAVX = 0;
541
542 // Use AES instructions if available.
543 if (supports_aes()) {
544 if (FLAG_IS_DEFAULT(UseAES)) {
545 UseAES = true;
546 }
547 } else if (UseAES) {
548 if (!FLAG_IS_DEFAULT(UseAES))
549 warning("AES instructions are not available on this CPU");
550 FLAG_SET_DEFAULT(UseAES, false);
551 }
552
553 // Use CLMUL instructions if available.
554 if (supports_clmul()) {
555 if (FLAG_IS_DEFAULT(UseCLMUL)) {
556 UseCLMUL = true;
557 }
558 } else if (UseCLMUL) {
559 if (!FLAG_IS_DEFAULT(UseCLMUL))
560 warning("CLMUL instructions not available on this CPU (AVX may also be required)");
561 FLAG_SET_DEFAULT(UseCLMUL, false);
562 }
563
564 if (UseCLMUL && (UseSSE > 2)) {
565 if (FLAG_IS_DEFAULT(UseCRC32Intrinsics)) {
566 UseCRC32Intrinsics = true;
567 }
568 } else if (UseCRC32Intrinsics) {
569 if (!FLAG_IS_DEFAULT(UseCRC32Intrinsics))
570 warning("CRC32 Intrinsics requires CLMUL instructions (not available on this CPU)");
571 FLAG_SET_DEFAULT(UseCRC32Intrinsics, false);
572 }
573
574 // The AES intrinsic stubs require AES instruction support (of course)
575 // but also require sse3 mode for instructions it use.
576 if (UseAES && (UseSSE > 2)) {
577 if (FLAG_IS_DEFAULT(UseAESIntrinsics)) {
578 UseAESIntrinsics = true;
579 }
580 } else if (UseAESIntrinsics) {
581 if (!FLAG_IS_DEFAULT(UseAESIntrinsics))
582 warning("AES intrinsics are not available on this CPU");
583 FLAG_SET_DEFAULT(UseAESIntrinsics, false);
584 }
585
586 // GHASH/GCM intrinsics
587 if (UseCLMUL && (UseSSE > 2)) {
588 if (FLAG_IS_DEFAULT(UseGHASHIntrinsics)) {
589 UseGHASHIntrinsics = true;
590 }
591 } else if (UseGHASHIntrinsics) {
592 if (!FLAG_IS_DEFAULT(UseGHASHIntrinsics))
593 warning("GHASH intrinsic requires CLMUL and SSE2 instructions on this CPU");
594 FLAG_SET_DEFAULT(UseGHASHIntrinsics, false);
595 }
596
597 if (UseSHA) {
598 warning("SHA instructions are not available on this CPU");
599 FLAG_SET_DEFAULT(UseSHA, false);
600 }
601 if (UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics) {
602 warning("SHA intrinsics are not available on this CPU");
603 FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);
604 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);
605 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
606 }
607
608 // Adjust RTM (Restricted Transactional Memory) flags
609 if (!supports_rtm() && UseRTMLocking) {
610 // Can't continue because UseRTMLocking affects UseBiasedLocking flag
611 // setting during arguments processing. See use_biased_locking().
612 // VM_Version_init() is executed after UseBiasedLocking is used
613 // in Thread::allocate().
614 vm_exit_during_initialization("RTM instructions are not available on this CPU");
615 }
616
617 #if INCLUDE_RTM_OPT
618 if (UseRTMLocking) {
619 if (is_intel_family_core()) {
620 if ((_model == CPU_MODEL_HASWELL_E3) ||
621 (_model == CPU_MODEL_HASWELL_E7 && _stepping < 3) ||
622 (_model == CPU_MODEL_BROADWELL && _stepping < 4)) {
623 if (!UnlockExperimentalVMOptions) {
624 vm_exit_during_initialization("UseRTMLocking is only available as experimental option on this platform. It must be enabled via -XX:+UnlockExperimentalVMOptions flag.");
625 } else {
626 warning("UseRTMLocking is only available as experimental option on this platform.");
627 }
628 }
629 }
630 if (!FLAG_IS_CMDLINE(UseRTMLocking)) {
631 // RTM locking should be used only for applications with
632 // high lock contention. For now we do not use it by default.
633 vm_exit_during_initialization("UseRTMLocking flag should be only set on command line");
634 }
635 if (!is_power_of_2(RTMTotalCountIncrRate)) {
636 warning("RTMTotalCountIncrRate must be a power of 2, resetting it to 64");
637 FLAG_SET_DEFAULT(RTMTotalCountIncrRate, 64);
638 }
639 if (RTMAbortRatio < 0 || RTMAbortRatio > 100) {
640 warning("RTMAbortRatio must be in the range 0 to 100, resetting it to 50");
641 FLAG_SET_DEFAULT(RTMAbortRatio, 50);
642 }
643 } else { // !UseRTMLocking
644 if (UseRTMForStackLocks) {
645 if (!FLAG_IS_DEFAULT(UseRTMForStackLocks)) {
646 warning("UseRTMForStackLocks flag should be off when UseRTMLocking flag is off");
647 }
648 FLAG_SET_DEFAULT(UseRTMForStackLocks, false);
649 }
650 if (UseRTMDeopt) {
651 FLAG_SET_DEFAULT(UseRTMDeopt, false);
652 }
653 if (PrintPreciseRTMLockingStatistics) {
654 FLAG_SET_DEFAULT(PrintPreciseRTMLockingStatistics, false);
655 }
656 }
657 #else
658 if (UseRTMLocking) {
659 // Only C2 does RTM locking optimization.
660 // Can't continue because UseRTMLocking affects UseBiasedLocking flag
661 // setting during arguments processing. See use_biased_locking().
662 vm_exit_during_initialization("RTM locking optimization is not supported in this VM");
663 }
664 #endif
665
666 #ifdef COMPILER2
667 if (UseFPUForSpilling) {
668 if (UseSSE < 2) {
669 // Only supported with SSE2+
670 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
671 }
672 }
673 if (MaxVectorSize > 0) {
674 if (!is_power_of_2(MaxVectorSize)) {
675 warning("MaxVectorSize must be a power of 2");
676 FLAG_SET_DEFAULT(MaxVectorSize, 32);
677 }
678 if (MaxVectorSize > 32) {
679 FLAG_SET_DEFAULT(MaxVectorSize, 32);
680 }
681 if (MaxVectorSize > 16 && (UseAVX == 0 || !os_supports_avx_vectors())) {
682 // 32 bytes vectors (in YMM) are only supported with AVX+
683 FLAG_SET_DEFAULT(MaxVectorSize, 16);
684 }
685 if (UseSSE < 2) {
686 // Vectors (in XMM) are only supported with SSE2+
687 FLAG_SET_DEFAULT(MaxVectorSize, 0);
688 }
689 #ifdef ASSERT
690 if (supports_avx() && PrintMiscellaneous && Verbose && TraceNewVectors) {
691 tty->print_cr("State of YMM registers after signal handle:");
692 int nreg = 2 LP64_ONLY(+2);
693 const char* ymm_name[4] = {"0", "7", "8", "15"};
694 for (int i = 0; i < nreg; i++) {
695 tty->print("YMM%s:", ymm_name[i]);
696 for (int j = 7; j >=0; j--) {
697 tty->print(" %x", _cpuid_info.ymm_save[i*8 + j]);
698 }
699 tty->cr();
700 }
701 }
702 #endif
703 }
704
705 #ifdef _LP64
706 if (FLAG_IS_DEFAULT(UseMultiplyToLenIntrinsic)) {
707 UseMultiplyToLenIntrinsic = true;
708 }
709 #else
710 if (UseMultiplyToLenIntrinsic) {
711 if (!FLAG_IS_DEFAULT(UseMultiplyToLenIntrinsic)) {
712 warning("multiplyToLen intrinsic is not available in 32-bit VM");
713 }
714 FLAG_SET_DEFAULT(UseMultiplyToLenIntrinsic, false);
715 }
716 #endif
717 #endif // COMPILER2
718
719 // On new cpus instructions which update whole XMM register should be used
720 // to prevent partial register stall due to dependencies on high half.
721 //
722 // UseXmmLoadAndClearUpper == true --> movsd(xmm, mem)
723 // UseXmmLoadAndClearUpper == false --> movlpd(xmm, mem)
724 // UseXmmRegToRegMoveAll == true --> movaps(xmm, xmm), movapd(xmm, xmm).
725 // UseXmmRegToRegMoveAll == false --> movss(xmm, xmm), movsd(xmm, xmm).
726
727 if( is_amd() ) { // AMD cpus specific settings
728 if( supports_sse2() && FLAG_IS_DEFAULT(UseAddressNop) ) {
729 // Use it on new AMD cpus starting from Opteron.
730 UseAddressNop = true;
731 }
732 if( supports_sse2() && FLAG_IS_DEFAULT(UseNewLongLShift) ) {
733 // Use it on new AMD cpus starting from Opteron.
734 UseNewLongLShift = true;
735 }
736 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
737 if( supports_sse4a() ) {
738 UseXmmLoadAndClearUpper = true; // use movsd only on '10h' Opteron
739 } else {
740 UseXmmLoadAndClearUpper = false;
741 }
742 }
743 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
744 if( supports_sse4a() ) {
745 UseXmmRegToRegMoveAll = true; // use movaps, movapd only on '10h'
746 } else {
747 UseXmmRegToRegMoveAll = false;
748 }
749 }
750 if( FLAG_IS_DEFAULT(UseXmmI2F) ) {
751 if( supports_sse4a() ) {
752 UseXmmI2F = true;
753 } else {
754 UseXmmI2F = false;
755 }
756 }
757 if( FLAG_IS_DEFAULT(UseXmmI2D) ) {
758 if( supports_sse4a() ) {
759 UseXmmI2D = true;
760 } else {
761 UseXmmI2D = false;
762 }
763 }
764 if( FLAG_IS_DEFAULT(UseSSE42Intrinsics) ) {
765 if( supports_sse4_2() && UseSSE >= 4 ) {
766 UseSSE42Intrinsics = true;
767 }
768 }
769
770 // some defaults for AMD family 15h
771 if ( cpu_family() == 0x15 ) {
772 // On family 15h processors default is no sw prefetch
773 if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
774 AllocatePrefetchStyle = 0;
775 }
776 // Also, if some other prefetch style is specified, default instruction type is PREFETCHW
777 if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
778 AllocatePrefetchInstr = 3;
779 }
780 // On family 15h processors use XMM and UnalignedLoadStores for Array Copy
781 if (supports_sse2() && FLAG_IS_DEFAULT(UseXMMForArrayCopy)) {
782 UseXMMForArrayCopy = true;
783 }
784 if (supports_sse2() && FLAG_IS_DEFAULT(UseUnalignedLoadStores)) {
785 UseUnalignedLoadStores = true;
786 }
787 }
788
789 #ifdef COMPILER2
790 if (MaxVectorSize > 16) {
791 // Limit vectors size to 16 bytes on current AMD cpus.
792 FLAG_SET_DEFAULT(MaxVectorSize, 16);
793 }
794 #endif // COMPILER2
795 }
796
797 if( is_intel() ) { // Intel cpus specific settings
798 if( FLAG_IS_DEFAULT(UseStoreImmI16) ) {
799 UseStoreImmI16 = false; // don't use it on Intel cpus
800 }
801 if( cpu_family() == 6 || cpu_family() == 15 ) {
802 if( FLAG_IS_DEFAULT(UseAddressNop) ) {
803 // Use it on all Intel cpus starting from PentiumPro
804 UseAddressNop = true;
805 }
806 }
807 if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) {
808 UseXmmLoadAndClearUpper = true; // use movsd on all Intel cpus
809 }
810 if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) {
811 if( supports_sse3() ) {
812 UseXmmRegToRegMoveAll = true; // use movaps, movapd on new Intel cpus
813 } else {
814 UseXmmRegToRegMoveAll = false;
815 }
816 }
817 if( cpu_family() == 6 && supports_sse3() ) { // New Intel cpus
818 #ifdef COMPILER2
819 if( FLAG_IS_DEFAULT(MaxLoopPad) ) {
820 // For new Intel cpus do the next optimization:
821 // don't align the beginning of a loop if there are enough instructions
822 // left (NumberOfLoopInstrToAlign defined in c2_globals.hpp)
823 // in current fetch line (OptoLoopAlignment) or the padding
824 // is big (> MaxLoopPad).
825 // Set MaxLoopPad to 11 for new Intel cpus to reduce number of
826 // generated NOP instructions. 11 is the largest size of one
827 // address NOP instruction '0F 1F' (see Assembler::nop(i)).
828 MaxLoopPad = 11;
829 }
830 #endif // COMPILER2
831 if (FLAG_IS_DEFAULT(UseXMMForArrayCopy)) {
832 UseXMMForArrayCopy = true; // use SSE2 movq on new Intel cpus
833 }
834 if (supports_sse4_2() && supports_ht()) { // Newest Intel cpus
835 if (FLAG_IS_DEFAULT(UseUnalignedLoadStores)) {
836 UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
837 }
838 }
839 if (supports_sse4_2() && UseSSE >= 4) {
840 if (FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
841 UseSSE42Intrinsics = true;
842 }
843 }
844 }
845 if ((cpu_family() == 0x06) &&
846 ((extended_cpu_model() == 0x36) || // Centerton
847 (extended_cpu_model() == 0x37) || // Silvermont
848 (extended_cpu_model() == 0x4D))) {
849 #ifdef COMPILER2
850 if (FLAG_IS_DEFAULT(OptoScheduling)) {
851 OptoScheduling = true;
852 }
853 #endif
854 if (supports_sse4_2()) { // Silvermont
855 if (FLAG_IS_DEFAULT(UseUnalignedLoadStores)) {
856 UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
857 }
858 }
859 }
860 if(FLAG_IS_DEFAULT(AllocatePrefetchInstr) && supports_3dnow_prefetch()) {
861 AllocatePrefetchInstr = 3;
862 }
863 }
864
865 // Use count leading zeros count instruction if available.
866 if (supports_lzcnt()) {
867 if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {
868 UseCountLeadingZerosInstruction = true;
869 }
870 } else if (UseCountLeadingZerosInstruction) {
871 warning("lzcnt instruction is not available on this CPU");
872 FLAG_SET_DEFAULT(UseCountLeadingZerosInstruction, false);
873 }
874
875 // Use count trailing zeros instruction if available
876 if (supports_bmi1()) {
877 // tzcnt does not require VEX prefix
878 if (FLAG_IS_DEFAULT(UseCountTrailingZerosInstruction)) {
879 if (!UseBMI1Instructions && !FLAG_IS_DEFAULT(UseBMI1Instructions)) {
880 // Don't use tzcnt if BMI1 is switched off on command line.
881 UseCountTrailingZerosInstruction = false;
882 } else {
883 UseCountTrailingZerosInstruction = true;
884 }
885 }
886 } else if (UseCountTrailingZerosInstruction) {
887 warning("tzcnt instruction is not available on this CPU");
888 FLAG_SET_DEFAULT(UseCountTrailingZerosInstruction, false);
889 }
890
891 // BMI instructions (except tzcnt) use an encoding with VEX prefix.
892 // VEX prefix is generated only when AVX > 0.
893 if (supports_bmi1() && supports_avx()) {
894 if (FLAG_IS_DEFAULT(UseBMI1Instructions)) {
895 UseBMI1Instructions = true;
896 }
897 } else if (UseBMI1Instructions) {
898 warning("BMI1 instructions are not available on this CPU (AVX is also required)");
899 FLAG_SET_DEFAULT(UseBMI1Instructions, false);
900 }
901
902 if (supports_bmi2() && supports_avx()) {
903 if (FLAG_IS_DEFAULT(UseBMI2Instructions)) {
904 UseBMI2Instructions = true;
905 }
906 } else if (UseBMI2Instructions) {
907 warning("BMI2 instructions are not available on this CPU (AVX is also required)");
908 FLAG_SET_DEFAULT(UseBMI2Instructions, false);
909 }
910
911 // Use population count instruction if available.
912 if (supports_popcnt()) {
913 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
914 UsePopCountInstruction = true;
915 }
916 } else if (UsePopCountInstruction) {
917 warning("POPCNT instruction is not available on this CPU");
918 FLAG_SET_DEFAULT(UsePopCountInstruction, false);
919 }
920
921 // Use fast-string operations if available.
922 if (supports_erms()) {
923 if (FLAG_IS_DEFAULT(UseFastStosb)) {
924 UseFastStosb = true;
925 }
926 } else if (UseFastStosb) {
927 warning("fast-string operations are not available on this CPU");
928 FLAG_SET_DEFAULT(UseFastStosb, false);
929 }
930
931 #ifdef COMPILER2
932 if (FLAG_IS_DEFAULT(AlignVector)) {
933 // Modern processors allow misaligned memory operations for vectors.
934 AlignVector = !UseUnalignedLoadStores;
935 }
936 #endif // COMPILER2
937
938 assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value");
939 assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value");
940
941 // set valid Prefetch instruction
942 if( ReadPrefetchInstr < 0 ) ReadPrefetchInstr = 0;
943 if( ReadPrefetchInstr > 3 ) ReadPrefetchInstr = 3;
944 if( ReadPrefetchInstr == 3 && !supports_3dnow_prefetch() ) ReadPrefetchInstr = 0;
945 if( !supports_sse() && supports_3dnow_prefetch() ) ReadPrefetchInstr = 3;
946
947 if( AllocatePrefetchInstr < 0 ) AllocatePrefetchInstr = 0;
948 if( AllocatePrefetchInstr > 3 ) AllocatePrefetchInstr = 3;
949 if( AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch() ) AllocatePrefetchInstr=0;
950 if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
951
952 // Allocation prefetch settings
953 intx cache_line_size = prefetch_data_size();
954 if( cache_line_size > AllocatePrefetchStepSize )
955 AllocatePrefetchStepSize = cache_line_size;
956
957 assert(AllocatePrefetchLines > 0, "invalid value");
958 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
959 AllocatePrefetchLines = 3;
960 assert(AllocateInstancePrefetchLines > 0, "invalid value");
961 if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM
962 AllocateInstancePrefetchLines = 1;
963
964 AllocatePrefetchDistance = allocate_prefetch_distance();
965 AllocatePrefetchStyle = allocate_prefetch_style();
966
967 if (is_intel() && cpu_family() == 6 && supports_sse3()) {
968 if (AllocatePrefetchStyle == 2) { // watermark prefetching on Core
969 #ifdef _LP64
970 AllocatePrefetchDistance = 384;
971 #else
972 AllocatePrefetchDistance = 320;
973 #endif
974 }
975 if (supports_sse4_2() && supports_ht()) { // Nehalem based cpus
976 AllocatePrefetchDistance = 192;
977 AllocatePrefetchLines = 4;
978 }
979 #ifdef COMPILER2
980 if (supports_sse4_2()) {
981 if (FLAG_IS_DEFAULT(UseFPUForSpilling)) {
982 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
983 }
984 }
985 #endif
986 }
987 assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
988
989 #ifdef _LP64
990 // Prefetch settings
991 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
992 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
993 PrefetchFieldsAhead = prefetch_fields_ahead();
994 #endif
995
996 if (FLAG_IS_DEFAULT(ContendedPaddingWidth) &&
997 (cache_line_size > ContendedPaddingWidth))
998 ContendedPaddingWidth = cache_line_size;
999
1000 #ifndef PRODUCT
1001 if (PrintMiscellaneous && Verbose) {
1002 tty->print_cr("Logical CPUs per core: %u",
1003 logical_processors_per_package());
1004 tty->print_cr("L1 data cache line size: %u", L1_data_cache_line_size());
1005 tty->print("UseSSE=%d", (int) UseSSE);
1006 if (UseAVX > 0) {
1007 tty->print(" UseAVX=%d", (int) UseAVX);
1008 }
1009 if (UseAES) {
1010 tty->print(" UseAES=1");
1011 }
1012 #ifdef COMPILER2
1013 if (MaxVectorSize > 0) {
1014 tty->print(" MaxVectorSize=%d", (int) MaxVectorSize);
1015 }
1016 #endif
1017 tty->cr();
1018 tty->print("Allocation");
1019 if (AllocatePrefetchStyle <= 0 || UseSSE == 0 && !supports_3dnow_prefetch()) {
1020 tty->print_cr(": no prefetching");
1021 } else {
1022 tty->print(" prefetching: ");
1023 if (UseSSE == 0 && supports_3dnow_prefetch()) {
1024 tty->print("PREFETCHW");
1025 } else if (UseSSE >= 1) {
1026 if (AllocatePrefetchInstr == 0) {
1027 tty->print("PREFETCHNTA");
1028 } else if (AllocatePrefetchInstr == 1) {
1029 tty->print("PREFETCHT0");
1030 } else if (AllocatePrefetchInstr == 2) {
1031 tty->print("PREFETCHT2");
1032 } else if (AllocatePrefetchInstr == 3) {
1033 tty->print("PREFETCHW");
1034 }
1035 }
1036 if (AllocatePrefetchLines > 1) {
1037 tty->print_cr(" at distance %d, %d lines of %d bytes", (int) AllocatePrefetchDistance, (int) AllocatePrefetchLines, (int) AllocatePrefetchStepSize);
1038 } else {
1039 tty->print_cr(" at distance %d, one line of %d bytes", (int) AllocatePrefetchDistance, (int) AllocatePrefetchStepSize);
1040 }
1041 }
1042
1043 if (PrefetchCopyIntervalInBytes > 0) {
1044 tty->print_cr("PrefetchCopyIntervalInBytes %d", (int) PrefetchCopyIntervalInBytes);
1045 }
1046 if (PrefetchScanIntervalInBytes > 0) {
1047 tty->print_cr("PrefetchScanIntervalInBytes %d", (int) PrefetchScanIntervalInBytes);
1048 }
1049 if (PrefetchFieldsAhead > 0) {
1050 tty->print_cr("PrefetchFieldsAhead %d", (int) PrefetchFieldsAhead);
1051 }
1052 if (ContendedPaddingWidth > 0) {
1053 tty->print_cr("ContendedPaddingWidth %d", (int) ContendedPaddingWidth);
1054 }
1055 }
1056 #endif // !PRODUCT
1057 }
1058
1059 bool VM_Version::use_biased_locking() {
1060 #if INCLUDE_RTM_OPT
1061 // RTM locking is most useful when there is high lock contention and
1062 // low data contention. With high lock contention the lock is usually
1063 // inflated and biased locking is not suitable for that case.
1064 // RTM locking code requires that biased locking is off.
1065 // Note: we can't switch off UseBiasedLocking in get_processor_features()
1066 // because it is used by Thread::allocate() which is called before
1067 // VM_Version::initialize().
1068 if (UseRTMLocking && UseBiasedLocking) {
1069 if (FLAG_IS_DEFAULT(UseBiasedLocking)) {
1070 FLAG_SET_DEFAULT(UseBiasedLocking, false);
1071 } else {
1072 warning("Biased locking is not supported with RTM locking; ignoring UseBiasedLocking flag." );
1073 UseBiasedLocking = false;
1074 }
1075 }
1076 #endif
1077 return UseBiasedLocking;
1078 }
1079
1080 void VM_Version::initialize() {
1081 ResourceMark rm;
1082 // Making this stub must be FIRST use of assembler
1083
1084 stub_blob = BufferBlob::create("get_cpu_info_stub", stub_size);
1085 if (stub_blob == NULL) {
1086 vm_exit_during_initialization("Unable to allocate get_cpu_info_stub");
1087 }
1088 CodeBuffer c(stub_blob);
1089 VM_Version_StubGenerator g(&c);
1090 get_cpu_info_stub = CAST_TO_FN_PTR(get_cpu_info_stub_t,
1091 g.generate_get_cpu_info());
1092
1093 get_processor_features();
1094 }