src/cpu/aarch64/vm/vm_version_aarch64.cpp

rev 8079 : 8079203: AARCH64: Need to cater for different partner implementations
Summary: Parse /proc/cpuinfo to derive implementation specific info
Reviewed-by: aph

*** 57,66 ****
--- 57,68 ----
  #define HWCAP_CRC32 (1<<7)
  #endif
  
  int VM_Version::_cpu;
  int VM_Version::_model;
+ int VM_Version::_variant;
+ int VM_Version::_revision;
  int VM_Version::_stepping;
  int VM_Version::_cpuFeatures;
  const char*           VM_Version::_features_str = "";
  
  static BufferBlob* stub_blob;
*** 127,136 ****
--- 129,162 ----
    if (auxv & HWCAP_AES)   strcat(buf, ", aes");
    if (auxv & HWCAP_SHA1)  strcat(buf, ", sha1");
    if (auxv & HWCAP_SHA2)  strcat(buf, ", sha256");
  
    _features_str = strdup(buf);
+   _cpuFeatures = auxv;
+ 
+   if (FILE *f = fopen("/proc/cpuinfo", "r")) {
+     char buf[128], *p;
+     while (fgets(buf, sizeof (buf), f) != NULL) {
+       if (p = strchr(buf, ':')) {
+         long v = strtol(p+1, NULL, 0);
+         if (strncmp(buf, "CPU implementer", sizeof "CPU implementer" - 1) == 0) {
+           _cpu = v;
+         } else if (strncmp(buf, "CPU variant", sizeof "CPU variant" - 1) == 0) {
+           _variant = v;
+         } else if (strncmp(buf, "CPU part", sizeof "CPU part" - 1) == 0) {
+           _model = v;
+         } else if (strncmp(buf, "CPU revision", sizeof "CPU revision" - 1) == 0) {
+           _revision = v;
+         }
+       }
+     }
+     fclose(f);
+   }
+ 
+   // Enable vendor specific features
+   if (_cpu == CPU_CAVIUM) _cpuFeatures |= CPU_DMB_ATOMICS;
+   if (_cpu == CPU_ARM) _cpuFeatures |= CPU_A53MAC;
  
    if (FLAG_IS_DEFAULT(UseCRC32)) {
      UseCRC32 = (auxv & HWCAP_CRC32) != 0;
    }
    if (UseCRC32 && (auxv & HWCAP_CRC32) == 0) {
*** 191,200 ****
--- 217,230 ----
        warning("SHA512 instruction (for SHA-384 and SHA-512) is not available on this CPU.");
        FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
      }
    }
  
+   if (FLAG_IS_DEFAULT(UseBarriersForVolatile)) {
+     UseBarriersForVolatile = (_cpuFeatures & CPU_DMB_ATOMICS) != 0;
+   }
+ 
  #ifdef COMPILER2
    if (FLAG_IS_DEFAULT(OptoScheduling)) {
      OptoScheduling = true;
    }
  #endif