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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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127 } | 127 } |
128 } | 128 } |
129 } | 129 } |
130 fclose(f); | 130 fclose(f); |
131 | 131 |
132 // Did not find string in the proc file. | 132 // Did not find string in the proc file. |
133 return false; | 133 return false; |
134 } | 134 } |
135 | 135 |
136 bool OS::ArmCpuHasFeature(CpuFeature feature) { | 136 bool OS::ArmCpuHasFeature(CpuFeature feature) { |
137 const char* search_string = NULL; | 137 const int max_items = 2; |
| 138 const char* search_strings[max_items] = { NULL, NULL }; |
| 139 int search_items = 0; |
138 // Simple detection of VFP at runtime for Linux. | 140 // Simple detection of VFP at runtime for Linux. |
139 // It is based on /proc/cpuinfo, which reveals hardware configuration | 141 // It is based on /proc/cpuinfo, which reveals hardware configuration |
140 // to user-space applications. According to ARM (mid 2009), no similar | 142 // to user-space applications. According to ARM (mid 2009), no similar |
141 // facility is universally available on the ARM architectures, | 143 // facility is universally available on the ARM architectures, |
142 // so it's up to individual OSes to provide such. | 144 // so it's up to individual OSes to provide such. |
143 switch (feature) { | 145 switch (feature) { |
144 case VFP3: | 146 case VFP3: |
145 search_string = "vfpv3"; | 147 search_strings[0] = "vfpv3"; |
| 148 // Some old kernels will report vfp for A8, not vfpv3, so we check for |
| 149 // A8 explicitely. The cpuinfo file report the CPU Part which for Cortex |
| 150 // A8 is 0xc08. |
| 151 search_strings[1] = "0xc08"; |
| 152 search_items = 2; |
| 153 ASSERT(search_items <= max_items); |
146 break; | 154 break; |
147 case ARMv7: | 155 case ARMv7: |
148 search_string = "ARMv7"; | 156 search_strings[0] = "ARMv7" ; |
| 157 search_items = 1; |
| 158 ASSERT(search_items <= max_items); |
149 break; | 159 break; |
150 default: | 160 default: |
151 UNREACHABLE(); | 161 UNREACHABLE(); |
152 } | 162 } |
153 | 163 |
154 if (CPUInfoContainsString(search_string)) { | 164 for (int i = 0; i < search_items; ++i) { |
155 return true; | 165 if (CPUInfoContainsString(search_strings[i])) { |
156 } | |
157 | |
158 if (feature == VFP3) { | |
159 // Some old kernels will report vfp not vfpv3. Here we make a last attempt | |
160 // to detect vfpv3 by checking for vfp *and* neon, since neon is only | |
161 // available on architectures with vfpv3. | |
162 // Checking neon on its own is not enough as it is possible to have neon | |
163 // without vfp. | |
164 if (CPUInfoContainsString("vfp") && CPUInfoContainsString("neon")) { | |
165 return true; | 166 return true; |
166 } | 167 } |
167 } | 168 } |
168 | 169 |
169 return false; | 170 return false; |
170 } | 171 } |
171 #endif // def __arm__ | 172 #endif // def __arm__ |
172 | 173 |
173 | 174 |
174 int OS::ActivationFrameAlignment() { | 175 int OS::ActivationFrameAlignment() { |
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944 } | 945 } |
945 | 946 |
946 // This sampler is no longer the active sampler. | 947 // This sampler is no longer the active sampler. |
947 active_sampler_ = NULL; | 948 active_sampler_ = NULL; |
948 } | 949 } |
949 | 950 |
950 | 951 |
951 #endif // ENABLE_LOGGING_AND_PROFILING | 952 #endif // ENABLE_LOGGING_AND_PROFILING |
952 | 953 |
953 } } // namespace v8::internal | 954 } } // namespace v8::internal |
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