1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 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 "vm_version_aarch64.hpp"
33 #ifdef TARGET_OS_FAMILY_linux
34 # include "os_linux.inline.hpp"
35 #endif
36
37 #ifndef BUILTIN_SIM
38 #include <sys/auxv.h>
39 #include <asm/hwcap.h>
40 #else
41 #define getauxval(hwcap) 0
42 #endif
43
44 #ifndef HWCAP_AES
45 #define HWCAP_AES (1<<3)
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 int VM_Version::_cpu;
61 int VM_Version::_model;
62 int VM_Version::_stepping;
63 int VM_Version::_cpuFeatures;
64 const char* VM_Version::_features_str = "";
65
66 static BufferBlob* stub_blob;
67 static const int stub_size = 550;
68
69 extern "C" {
70 typedef void (*getPsrInfo_stub_t)(void*);
71 }
72 static getPsrInfo_stub_t getPsrInfo_stub = NULL;
73
74
75 class VM_Version_StubGenerator: public StubCodeGenerator {
76 public:
77
78 VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
79
80 address generate_getPsrInfo() {
81 StubCodeMark mark(this, "VM_Version", "getPsrInfo_stub");
82 # define __ _masm->
83 address start = __ pc();
84
85 #ifdef BUILTIN_SIM
86 __ c_stub_prolog(1, 0, MacroAssembler::ret_type_void);
87 #endif
88
89 // void getPsrInfo(VM_Version::CpuidInfo* cpuid_info);
90
91 address entry = __ pc();
92
93 // TODO : redefine fields in CpuidInfo and generate
94 // code to fill them in
95
96 __ ret(lr);
97
98 # undef __
99
100 return start;
101 }
102 };
103
104
105 void VM_Version::get_processor_features() {
106 _supports_cx8 = true;
107 _supports_atomic_getset4 = true;
108 _supports_atomic_getadd4 = true;
109 _supports_atomic_getset8 = true;
110 _supports_atomic_getadd8 = true;
111
112 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance))
113 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
114 if (FLAG_IS_DEFAULT(AllocatePrefetchStepSize))
115 FLAG_SET_DEFAULT(AllocatePrefetchStepSize, 64);
116 FLAG_SET_DEFAULT(PrefetchScanIntervalInBytes, 256);
117 FLAG_SET_DEFAULT(PrefetchFieldsAhead, 256);
118 FLAG_SET_DEFAULT(PrefetchCopyIntervalInBytes, 256);
119 FLAG_SET_DEFAULT(UseSSE42Intrinsics, true);
120
121 unsigned long auxv = getauxval(AT_HWCAP);
122
123 char buf[512];
124
125 strcpy(buf, "simd");
126 if (auxv & HWCAP_CRC32) strcat(buf, ", crc");
127 if (auxv & HWCAP_AES) strcat(buf, ", aes");
128 if (auxv & HWCAP_SHA1) strcat(buf, ", sha1");
129 if (auxv & HWCAP_SHA2) strcat(buf, ", sha256");
130
131 _features_str = strdup(buf);
132
133 if (FLAG_IS_DEFAULT(UseCRC32)) {
134 UseCRC32 = (auxv & HWCAP_CRC32) != 0;
135 }
136 if (UseCRC32 && (auxv & HWCAP_CRC32) == 0) {
137 warning("UseCRC32 specified, but not supported on this CPU");
138 }
139 if (auxv & HWCAP_AES) {
140 UseAES = UseAES || FLAG_IS_DEFAULT(UseAES);
141 UseAESIntrinsics =
142 UseAESIntrinsics || (UseAES && FLAG_IS_DEFAULT(UseAESIntrinsics));
143 if (UseAESIntrinsics && !UseAES) {
144 warning("UseAESIntrinsics enabled, but UseAES not, enabling");
145 UseAES = true;
146 }
147 } else {
148 if (UseAES) {
149 warning("UseAES specified, but not supported on this CPU");
150 }
151 if (UseAESIntrinsics) {
152 warning("UseAESIntrinsics specified, but not supported on this CPU");
153 }
154 }
155
156 if (FLAG_IS_DEFAULT(UseCRC32Intrinsics)) {
157 UseCRC32Intrinsics = true;
158 }
159
160 if (auxv & (HWCAP_SHA1 | HWCAP_SHA2)) {
161 if (FLAG_IS_DEFAULT(UseSHA)) {
162 FLAG_SET_DEFAULT(UseSHA, true);
163 }
164 } else if (UseSHA) {
165 warning("SHA instructions are not available on this CPU");
166 FLAG_SET_DEFAULT(UseSHA, false);
167 }
168
169 if (!UseSHA) {
170 FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);
171 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);
172 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
173 } else {
174 if (auxv & HWCAP_SHA1) {
175 if (FLAG_IS_DEFAULT(UseSHA1Intrinsics)) {
176 FLAG_SET_DEFAULT(UseSHA1Intrinsics, true);
177 }
178 } else if (UseSHA1Intrinsics) {
179 warning("SHA1 instruction is not available on this CPU.");
180 FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);
181 }
182 if (auxv & HWCAP_SHA2) {
183 if (FLAG_IS_DEFAULT(UseSHA256Intrinsics)) {
184 FLAG_SET_DEFAULT(UseSHA256Intrinsics, true);
185 }
186 } else if (UseSHA256Intrinsics) {
187 warning("SHA256 instruction (for SHA-224 and SHA-256) is not available on this CPU.");
188 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);
189 }
190 if (UseSHA512Intrinsics) {
191 warning("SHA512 instruction (for SHA-384 and SHA-512) is not available on this CPU.");
192 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
193 }
194 }
195
196 #ifdef COMPILER2
197 if (FLAG_IS_DEFAULT(OptoScheduling)) {
198 OptoScheduling = true;
199 }
200 #endif
201 }
202
203 void VM_Version::initialize() {
204 ResourceMark rm;
205
206 stub_blob = BufferBlob::create("getPsrInfo_stub", stub_size);
207 if (stub_blob == NULL) {
208 vm_exit_during_initialization("Unable to allocate getPsrInfo_stub");
209 }
210
211 CodeBuffer c(stub_blob);
212 VM_Version_StubGenerator g(&c);
213 getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t,
214 g.generate_getPsrInfo());
215
216 get_processor_features();
217 }