return model id in cpuid for x86_64

        stepping = 3;

#endif

#endif

        env->cpuid_level = 2;

        env->cpuid_version = (family << 8) | (model << 4) | stepping;

        env->cpuid_features = (CPUID_FP87 | CPUID_DE | CPUID_PSE |

                               CPUID_TSC | CPUID_MSR | CPUID_MCE |

                               CPUID_CX8 | CPUID_PGE | CPUID_CMOV);

        env->cpuid_ext_features = 0;

        env->cpuid_features |= CPUID_FXSR | CPUID_MMX | CPUID_SSE | CPUID_SSE2 | CPUID_PAE | CPUID_SEP;

        env->cpuid_xlevel = 0;

        {

            const char *model_id = "QEMU Virtual CPU version " QEMU_VERSION;

            int c, len, i;

            len = strlen(model_id);

            for(i = 0; i < 48; i++) {

                if (i >= len)

                    c = '\0';

                else

                    c = model_id[i];

                env->cpuid_model[i >> 2] |= c << (8 * (i & 3));

            }

        }

#ifdef TARGET_X86_64

        /* currently not enabled for std i386 because not fully tested */

        env->cpuid_features |= CPUID_APIC;

        env->cpuid_ext2_features = (env->cpuid_features & 0x0183F3FF);

        env->cpuid_ext2_features |= CPUID_EXT2_LM | CPUID_EXT2_SYSCALL;

        env->cpuid_xlevel = 0x80000008;

#endif

    }

    cpu_single_env = env;