void BX_CPU_C::RDPMC(bxInstruction_c *i){/* We need to be Pentium with MMX or later */#if ((BX_CPU_LEVEL >= 6) || (BX_SUPPORT_MMX && BX_CPU_LEVEL == 5)) bx_bool pce = BX_CPU_THIS_PTR cr4.get_PCE(); if ((pce==1) || (CPL==0) || real_mode()) { /* According to manual, Pentium 4 has 18 counters, * previous versions have two. And the P4 also can do * short read-out (EDX always 0). Otherwise it is * limited to 40 bits. */#if (BX_CPU_LEVEL == 6 && BX_SUPPORT_SSE >= 2) // Pentium 4 processor (see cpuid.cc) if ((ECX & 0x7fffffff) >= 18) exception(BX_GP_EXCEPTION, 0, 0);#else // if ((ECX & 0xffffffff) >= 2) exception(BX_GP_EXCEPTION, 0, 0);#endif // Most counters are for hardware specific details, which // we anyhow do not emulate (like pipeline stalls etc) // Could be interesting to count number of memory reads, // writes. Misaligned etc... But to monitor bochs, this // is easier done from the host. EAX = 0; EDX = 0; // if P4 and ECX & 0x10000000, then always 0 (short read 32 bits) BX_ERROR(("RDPMC: Performance Counters Support not reasonably implemented yet")); } else { // not allowed to use RDPMC! exception(BX_GP_EXCEPTION, 0, 0); }#else UndefinedOpcode(i);#endif}