--- old/src/cpu/x86/vm/vm_version_x86.hpp	2014-03-14 15:54:24.000000000 -0700
+++ new/src/cpu/x86/vm/vm_version_x86.hpp	2014-03-14 15:54:24.000000000 -0700
@@ -229,6 +229,9 @@
                                // 0 if this instruction is not available
   static const char* _features_str;
 
+  static address   _cpuinfo_segv_addr; // address of instruction which causes SEGV
+  static address   _cpuinfo_cont_addr; // address of instruction after SEGV processed
+
   enum {
     CPU_CX8    = (1 << 0), // next bits are from cpuid 1 (EDX)
     CPU_CMOV   = (1 << 1),
@@ -361,6 +364,9 @@
     // extended control register XCR0 (the XFEATURE_ENABLED_MASK register)
     XemXcr0Eax   xem_xcr0_eax;
     uint32_t     xem_xcr0_edx; // reserved
+
+    // Space to save ymm registers after signal handle
+    int          ymm_save[8*4]; // Save ymm0, ymm7, ymm8, ymm15
   };
 
   // The actual cpuid info block
@@ -460,6 +466,19 @@
     return result;
   }
 
+  static bool os_supports_avx_vectors() {
+    if (!supports_avx()) {
+      return false;
+    }
+    int nreg = 2 LP64_ONLY(+2);
+    for (int i = 0; i < 8 * nreg; i++) { // 32 bytes 4 ymm registers
+      if (_cpuid_info.ymm_save[i] != ymm_test_value()) {
+        return false;
+      }
+    }
+    return true;
+  }
+
   static void get_processor_features();
 
 public:
@@ -476,6 +495,19 @@
   static ByteSize tpl_cpuidB1_offset() { return byte_offset_of(CpuidInfo, tpl_cpuidB1_eax); }
   static ByteSize tpl_cpuidB2_offset() { return byte_offset_of(CpuidInfo, tpl_cpuidB2_eax); }
   static ByteSize xem_xcr0_offset() { return byte_offset_of(CpuidInfo, xem_xcr0_eax); }
+  static ByteSize ymm_save_offset() { return byte_offset_of(CpuidInfo, ymm_save); }
+
+  // The value used to check ymm register after signal handle 
+  static int ymm_test_value()    { return 0xCAFEBABE; }
+
+  static void set_cpuinfo_segv_addr(address pc) { _cpuinfo_segv_addr = pc; }
+  static bool  is_cpuinfo_segv_addr(address pc) { return _cpuinfo_segv_addr == pc; }
+  static void set_cpuinfo_cont_addr(address pc) { _cpuinfo_cont_addr = pc; }
+  static address  cpuinfo_cont_addr()           { return _cpuinfo_cont_addr; }
+
+  static void clean_cpuFeatures()   { _cpuFeatures = 0; }
+  static void set_avx_cpuFeatures() { _cpuFeatures = (CPU_SSE | CPU_SSE2 | CPU_AVX); }
+
 
   // Initialization
   static void initialize();