1 /*
2 * Copyright (c) 1997, 2010, 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 class VM_Version : public Abstract_VM_Version {
26 public:
27 // cpuid result register layouts. These are all unions of a uint32_t
28 // (in case anyone wants access to the register as a whole) and a bitfield.
29
30 union StdCpuid1Eax {
31 uint32_t value;
32 struct {
33 uint32_t stepping : 4,
34 model : 4,
35 family : 4,
36 proc_type : 2,
37 : 2,
38 ext_model : 4,
39 ext_family : 8,
40 : 4;
41 } bits;
42 };
43
44 union StdCpuid1Ebx { // example, unused
45 uint32_t value;
46 struct {
47 uint32_t brand_id : 8,
48 clflush_size : 8,
49 threads_per_cpu : 8,
50 apic_id : 8;
51 } bits;
52 };
53
54 union StdCpuid1Ecx {
55 uint32_t value;
56 struct {
57 uint32_t sse3 : 1,
58 : 2,
59 monitor : 1,
60 : 1,
61 vmx : 1,
62 : 1,
63 est : 1,
64 : 1,
65 ssse3 : 1,
66 cid : 1,
67 : 2,
68 cmpxchg16: 1,
69 : 4,
70 dca : 1,
71 sse4_1 : 1,
72 sse4_2 : 1,
73 : 2,
74 popcnt : 1,
75 : 8;
76 } bits;
77 };
78
79 union StdCpuid1Edx {
80 uint32_t value;
81 struct {
82 uint32_t : 4,
83 tsc : 1,
84 : 3,
85 cmpxchg8 : 1,
86 : 6,
87 cmov : 1,
88 : 7,
89 mmx : 1,
90 fxsr : 1,
91 sse : 1,
92 sse2 : 1,
93 : 1,
94 ht : 1,
95 : 3;
96 } bits;
97 };
98
99 union DcpCpuid4Eax {
100 uint32_t value;
101 struct {
102 uint32_t cache_type : 5,
103 : 21,
104 cores_per_cpu : 6;
105 } bits;
106 };
107
108 union DcpCpuid4Ebx {
109 uint32_t value;
110 struct {
111 uint32_t L1_line_size : 12,
112 partitions : 10,
113 associativity : 10;
114 } bits;
115 };
116
117 union TplCpuidBEbx {
118 uint32_t value;
119 struct {
120 uint32_t logical_cpus : 16,
121 : 16;
122 } bits;
123 };
124
125 union ExtCpuid1Ecx {
126 uint32_t value;
127 struct {
128 uint32_t LahfSahf : 1,
129 CmpLegacy : 1,
130 : 4,
131 lzcnt : 1,
132 sse4a : 1,
133 misalignsse : 1,
134 prefetchw : 1,
135 : 22;
136 } bits;
137 };
138
139 union ExtCpuid1Edx {
140 uint32_t value;
141 struct {
142 uint32_t : 22,
143 mmx_amd : 1,
144 mmx : 1,
145 fxsr : 1,
146 : 4,
147 long_mode : 1,
148 tdnow2 : 1,
149 tdnow : 1;
150 } bits;
151 };
152
153 union ExtCpuid5Ex {
154 uint32_t value;
155 struct {
156 uint32_t L1_line_size : 8,
157 L1_tag_lines : 8,
158 L1_assoc : 8,
159 L1_size : 8;
160 } bits;
161 };
162
163 union ExtCpuid8Ecx {
164 uint32_t value;
165 struct {
166 uint32_t cores_per_cpu : 8,
167 : 24;
168 } bits;
169 };
170
171 protected:
172 static int _cpu;
173 static int _model;
174 static int _stepping;
175 static int _cpuFeatures; // features returned by the "cpuid" instruction
176 // 0 if this instruction is not available
177 static const char* _features_str;
178
179 enum {
180 CPU_CX8 = (1 << 0), // next bits are from cpuid 1 (EDX)
181 CPU_CMOV = (1 << 1),
182 CPU_FXSR = (1 << 2),
183 CPU_HT = (1 << 3),
184 CPU_MMX = (1 << 4),
185 CPU_3DNOW = (1 << 5), // 3DNow comes from cpuid 0x80000001 (EDX)
186 CPU_SSE = (1 << 6),
187 CPU_SSE2 = (1 << 7),
188 CPU_SSE3 = (1 << 8), // SSE3 comes from cpuid 1 (ECX)
189 CPU_SSSE3 = (1 << 9),
190 CPU_SSE4A = (1 << 10),
191 CPU_SSE4_1 = (1 << 11),
192 CPU_SSE4_2 = (1 << 12),
193 CPU_POPCNT = (1 << 13),
194 CPU_LZCNT = (1 << 14)
195 } cpuFeatureFlags;
196
197 // cpuid information block. All info derived from executing cpuid with
198 // various function numbers is stored here. Intel and AMD info is
199 // merged in this block: accessor methods disentangle it.
200 //
201 // The info block is laid out in subblocks of 4 dwords corresponding to
202 // eax, ebx, ecx and edx, whether or not they contain anything useful.
203 struct CpuidInfo {
204 // cpuid function 0
205 uint32_t std_max_function;
206 uint32_t std_vendor_name_0;
207 uint32_t std_vendor_name_1;
208 uint32_t std_vendor_name_2;
209
210 // cpuid function 1
211 StdCpuid1Eax std_cpuid1_eax;
212 StdCpuid1Ebx std_cpuid1_ebx;
213 StdCpuid1Ecx std_cpuid1_ecx;
214 StdCpuid1Edx std_cpuid1_edx;
215
216 // cpuid function 4 (deterministic cache parameters)
217 DcpCpuid4Eax dcp_cpuid4_eax;
218 DcpCpuid4Ebx dcp_cpuid4_ebx;
219 uint32_t dcp_cpuid4_ecx; // unused currently
220 uint32_t dcp_cpuid4_edx; // unused currently
221
222 // cpuid function 0xB (processor topology)
223 // ecx = 0
224 uint32_t tpl_cpuidB0_eax;
225 TplCpuidBEbx tpl_cpuidB0_ebx;
226 uint32_t tpl_cpuidB0_ecx; // unused currently
227 uint32_t tpl_cpuidB0_edx; // unused currently
228
229 // ecx = 1
230 uint32_t tpl_cpuidB1_eax;
231 TplCpuidBEbx tpl_cpuidB1_ebx;
232 uint32_t tpl_cpuidB1_ecx; // unused currently
233 uint32_t tpl_cpuidB1_edx; // unused currently
234
235 // ecx = 2
236 uint32_t tpl_cpuidB2_eax;
237 TplCpuidBEbx tpl_cpuidB2_ebx;
238 uint32_t tpl_cpuidB2_ecx; // unused currently
239 uint32_t tpl_cpuidB2_edx; // unused currently
240
241 // cpuid function 0x80000000 // example, unused
242 uint32_t ext_max_function;
243 uint32_t ext_vendor_name_0;
244 uint32_t ext_vendor_name_1;
245 uint32_t ext_vendor_name_2;
246
247 // cpuid function 0x80000001
248 uint32_t ext_cpuid1_eax; // reserved
249 uint32_t ext_cpuid1_ebx; // reserved
250 ExtCpuid1Ecx ext_cpuid1_ecx;
251 ExtCpuid1Edx ext_cpuid1_edx;
252
253 // cpuid functions 0x80000002 thru 0x80000004: example, unused
254 uint32_t proc_name_0, proc_name_1, proc_name_2, proc_name_3;
255 uint32_t proc_name_4, proc_name_5, proc_name_6, proc_name_7;
256 uint32_t proc_name_8, proc_name_9, proc_name_10,proc_name_11;
257
258 // cpuid function 0x80000005 //AMD L1, Intel reserved
259 uint32_t ext_cpuid5_eax; // unused currently
260 uint32_t ext_cpuid5_ebx; // reserved
261 ExtCpuid5Ex ext_cpuid5_ecx; // L1 data cache info (AMD)
262 ExtCpuid5Ex ext_cpuid5_edx; // L1 instruction cache info (AMD)
263
264 // cpuid function 0x80000008
265 uint32_t ext_cpuid8_eax; // unused currently
266 uint32_t ext_cpuid8_ebx; // reserved
267 ExtCpuid8Ecx ext_cpuid8_ecx;
268 uint32_t ext_cpuid8_edx; // reserved
269 };
270
271 // The actual cpuid info block
272 static CpuidInfo _cpuid_info;
273
274 // Extractors and predicates
275 static uint32_t extended_cpu_family() {
276 uint32_t result = _cpuid_info.std_cpuid1_eax.bits.family;
277 result += _cpuid_info.std_cpuid1_eax.bits.ext_family;
278 return result;
279 }
280 static uint32_t extended_cpu_model() {
281 uint32_t result = _cpuid_info.std_cpuid1_eax.bits.model;
282 result |= _cpuid_info.std_cpuid1_eax.bits.ext_model << 4;
283 return result;
284 }
285 static uint32_t cpu_stepping() {
286 uint32_t result = _cpuid_info.std_cpuid1_eax.bits.stepping;
287 return result;
288 }
289 static uint logical_processor_count() {
290 uint result = threads_per_core();
291 return result;
292 }
293 static uint32_t feature_flags() {
294 uint32_t result = 0;
295 if (_cpuid_info.std_cpuid1_edx.bits.cmpxchg8 != 0)
296 result |= CPU_CX8;
297 if (_cpuid_info.std_cpuid1_edx.bits.cmov != 0)
298 result |= CPU_CMOV;
299 if (_cpuid_info.std_cpuid1_edx.bits.fxsr != 0 || (is_amd() &&
300 _cpuid_info.ext_cpuid1_edx.bits.fxsr != 0))
301 result |= CPU_FXSR;
302 // HT flag is set for multi-core processors also.
303 if (threads_per_core() > 1)
304 result |= CPU_HT;
305 if (_cpuid_info.std_cpuid1_edx.bits.mmx != 0 || (is_amd() &&
306 _cpuid_info.ext_cpuid1_edx.bits.mmx != 0))
307 result |= CPU_MMX;
308 if (_cpuid_info.std_cpuid1_edx.bits.sse != 0)
309 result |= CPU_SSE;
310 if (_cpuid_info.std_cpuid1_edx.bits.sse2 != 0)
311 result |= CPU_SSE2;
312 if (_cpuid_info.std_cpuid1_ecx.bits.sse3 != 0)
313 result |= CPU_SSE3;
314 if (_cpuid_info.std_cpuid1_ecx.bits.ssse3 != 0)
315 result |= CPU_SSSE3;
316 if (_cpuid_info.std_cpuid1_ecx.bits.sse4_1 != 0)
317 result |= CPU_SSE4_1;
318 if (_cpuid_info.std_cpuid1_ecx.bits.sse4_2 != 0)
319 result |= CPU_SSE4_2;
320 if (_cpuid_info.std_cpuid1_ecx.bits.popcnt != 0)
321 result |= CPU_POPCNT;
322
323 // AMD features.
324 if (is_amd()) {
325 if (_cpuid_info.ext_cpuid1_edx.bits.tdnow != 0)
326 result |= CPU_3DNOW;
327 if (_cpuid_info.ext_cpuid1_ecx.bits.lzcnt != 0)
328 result |= CPU_LZCNT;
329 if (_cpuid_info.ext_cpuid1_ecx.bits.sse4a != 0)
330 result |= CPU_SSE4A;
331 }
332
333 return result;
334 }
335
336 static void get_processor_features();
337
338 public:
339 // Offsets for cpuid asm stub
340 static ByteSize std_cpuid0_offset() { return byte_offset_of(CpuidInfo, std_max_function); }
341 static ByteSize std_cpuid1_offset() { return byte_offset_of(CpuidInfo, std_cpuid1_eax); }
342 static ByteSize dcp_cpuid4_offset() { return byte_offset_of(CpuidInfo, dcp_cpuid4_eax); }
343 static ByteSize ext_cpuid1_offset() { return byte_offset_of(CpuidInfo, ext_cpuid1_eax); }
344 static ByteSize ext_cpuid5_offset() { return byte_offset_of(CpuidInfo, ext_cpuid5_eax); }
345 static ByteSize ext_cpuid8_offset() { return byte_offset_of(CpuidInfo, ext_cpuid8_eax); }
346 static ByteSize tpl_cpuidB0_offset() { return byte_offset_of(CpuidInfo, tpl_cpuidB0_eax); }
347 static ByteSize tpl_cpuidB1_offset() { return byte_offset_of(CpuidInfo, tpl_cpuidB1_eax); }
348 static ByteSize tpl_cpuidB2_offset() { return byte_offset_of(CpuidInfo, tpl_cpuidB2_eax); }
349
350 // Initialization
351 static void initialize();
352
353 // Asserts
354 static void assert_is_initialized() {
355 assert(_cpuid_info.std_cpuid1_eax.bits.family != 0, "VM_Version not initialized");
356 }
357
358 //
359 // Processor family:
360 // 3 - 386
361 // 4 - 486
362 // 5 - Pentium
363 // 6 - PentiumPro, Pentium II, Celeron, Xeon, Pentium III, Athlon,
364 // Pentium M, Core Solo, Core Duo, Core2 Duo
365 // family 6 model: 9, 13, 14, 15
366 // 0x0f - Pentium 4, Opteron
367 //
368 // Note: The cpu family should be used to select between
369 // instruction sequences which are valid on all Intel
370 // processors. Use the feature test functions below to
371 // determine whether a particular instruction is supported.
372 //
373 static int cpu_family() { return _cpu;}
374 static bool is_P6() { return cpu_family() >= 6; }
375
376 static bool is_amd() { assert_is_initialized(); return _cpuid_info.std_vendor_name_0 == 0x68747541; } // 'htuA'
377 static bool is_intel() { assert_is_initialized(); return _cpuid_info.std_vendor_name_0 == 0x756e6547; } // 'uneG'
378
379 static bool supports_processor_topology() {
380 return (_cpuid_info.std_max_function >= 0xB) &&
381 // eax[4:0] | ebx[0:15] == 0 indicates invalid topology level.
382 // Some cpus have max cpuid >= 0xB but do not support processor topology.
383 ((_cpuid_info.tpl_cpuidB0_eax & 0x1f | _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus) != 0);
384 }
385
386 static uint cores_per_cpu() {
387 uint result = 1;
388 if (is_intel()) {
389 if (supports_processor_topology()) {
390 result = _cpuid_info.tpl_cpuidB1_ebx.bits.logical_cpus /
391 _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus;
392 } else {
393 result = (_cpuid_info.dcp_cpuid4_eax.bits.cores_per_cpu + 1);
394 }
395 } else if (is_amd()) {
396 result = (_cpuid_info.ext_cpuid8_ecx.bits.cores_per_cpu + 1);
397 }
398 return result;
399 }
400
401 static uint threads_per_core() {
402 uint result = 1;
403 if (is_intel() && supports_processor_topology()) {
404 result = _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus;
405 } else if (_cpuid_info.std_cpuid1_edx.bits.ht != 0) {
406 result = _cpuid_info.std_cpuid1_ebx.bits.threads_per_cpu /
407 cores_per_cpu();
408 }
409 return result;
410 }
411
412 static intx L1_data_cache_line_size() {
413 intx result = 0;
414 if (is_intel()) {
415 result = (_cpuid_info.dcp_cpuid4_ebx.bits.L1_line_size + 1);
416 } else if (is_amd()) {
417 result = _cpuid_info.ext_cpuid5_ecx.bits.L1_line_size;
418 }
419 if (result < 32) // not defined ?
420 result = 32; // 32 bytes by default on x86 and other x64
421 return result;
422 }
423
424 //
425 // Feature identification
426 //
427 static bool supports_cpuid() { return _cpuFeatures != 0; }
428 static bool supports_cmpxchg8() { return (_cpuFeatures & CPU_CX8) != 0; }
429 static bool supports_cmov() { return (_cpuFeatures & CPU_CMOV) != 0; }
430 static bool supports_fxsr() { return (_cpuFeatures & CPU_FXSR) != 0; }
431 static bool supports_ht() { return (_cpuFeatures & CPU_HT) != 0; }
432 static bool supports_mmx() { return (_cpuFeatures & CPU_MMX) != 0; }
433 static bool supports_sse() { return (_cpuFeatures & CPU_SSE) != 0; }
434 static bool supports_sse2() { return (_cpuFeatures & CPU_SSE2) != 0; }
435 static bool supports_sse3() { return (_cpuFeatures & CPU_SSE3) != 0; }
436 static bool supports_ssse3() { return (_cpuFeatures & CPU_SSSE3)!= 0; }
437 static bool supports_sse4_1() { return (_cpuFeatures & CPU_SSE4_1) != 0; }
438 static bool supports_sse4_2() { return (_cpuFeatures & CPU_SSE4_2) != 0; }
439 static bool supports_popcnt() { return (_cpuFeatures & CPU_POPCNT) != 0; }
440 //
441 // AMD features
442 //
443 static bool supports_3dnow() { return (_cpuFeatures & CPU_3DNOW) != 0; }
444 static bool supports_mmx_ext() { return is_amd() && _cpuid_info.ext_cpuid1_edx.bits.mmx_amd != 0; }
445 static bool supports_3dnow2() { return is_amd() && _cpuid_info.ext_cpuid1_edx.bits.tdnow2 != 0; }
446 static bool supports_lzcnt() { return (_cpuFeatures & CPU_LZCNT) != 0; }
447 static bool supports_sse4a() { return (_cpuFeatures & CPU_SSE4A) != 0; }
448
449 static bool supports_compare_and_exchange() { return true; }
450
451 static const char* cpu_features() { return _features_str; }
452
453 static intx allocate_prefetch_distance() {
454 // This method should be called before allocate_prefetch_style().
455 //
456 // Hardware prefetching (distance/size in bytes):
457 // Pentium 3 - 64 / 32
458 // Pentium 4 - 256 / 128
459 // Athlon - 64 / 32 ????
460 // Opteron - 128 / 64 only when 2 sequential cache lines accessed
461 // Core - 128 / 64
462 //
463 // Software prefetching (distance in bytes / instruction with best score):
464 // Pentium 3 - 128 / prefetchnta
465 // Pentium 4 - 512 / prefetchnta
466 // Athlon - 128 / prefetchnta
467 // Opteron - 256 / prefetchnta
468 // Core - 256 / prefetchnta
469 // It will be used only when AllocatePrefetchStyle > 0
470
471 intx count = AllocatePrefetchDistance;
472 if (count < 0) { // default ?
473 if (is_amd()) { // AMD
474 if (supports_sse2())
475 count = 256; // Opteron
476 else
477 count = 128; // Athlon
478 } else { // Intel
479 if (supports_sse2())
480 if (cpu_family() == 6) {
481 count = 256; // Pentium M, Core, Core2
482 } else {
483 count = 512; // Pentium 4
484 }
485 else
486 count = 128; // Pentium 3 (and all other old CPUs)
487 }
488 }
489 return count;
490 }
491 static intx allocate_prefetch_style() {
492 assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive");
493 // Return 0 if AllocatePrefetchDistance was not defined.
494 return AllocatePrefetchDistance > 0 ? AllocatePrefetchStyle : 0;
495 }
496
497 // Prefetch interval for gc copy/scan == 9 dcache lines. Derived from
498 // 50-warehouse specjbb runs on a 2-way 1.8ghz opteron using a 4gb heap.
499 // Tested intervals from 128 to 2048 in increments of 64 == one cache line.
500 // 256 bytes (4 dcache lines) was the nearest runner-up to 576.
501
502 // gc copy/scan is disabled if prefetchw isn't supported, because
503 // Prefetch::write emits an inlined prefetchw on Linux.
504 // Do not use the 3dnow prefetchw instruction. It isn't supported on em64t.
505 // The used prefetcht0 instruction works for both amd64 and em64t.
506 static intx prefetch_copy_interval_in_bytes() {
507 intx interval = PrefetchCopyIntervalInBytes;
508 return interval >= 0 ? interval : 576;
509 }
510 static intx prefetch_scan_interval_in_bytes() {
511 intx interval = PrefetchScanIntervalInBytes;
512 return interval >= 0 ? interval : 576;
513 }
514 static intx prefetch_fields_ahead() {
515 intx count = PrefetchFieldsAhead;
516 return count >= 0 ? count : 1;
517 }
518 };