diff options
| -rw-r--r-- | src/devices/oprom/x86emu/ops2.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/src/devices/oprom/x86emu/ops2.c b/src/devices/oprom/x86emu/ops2.c index 29c2a64054..113ac0a498 100644 --- a/src/devices/oprom/x86emu/ops2.c +++ b/src/devices/oprom/x86emu/ops2.c @@ -156,6 +156,40 @@ static void x86emuOp2_wrmsr(u8 op2) } /**************************************************************************** +REMARKS: +Handles opcode 0x0f,0x31 +****************************************************************************/ +static void x86emuOp2_rdtsc(u8 X86EMU_UNUSED(op2)) +{ +#ifdef __HAS_LONG_LONG__ + static u64 counter = 0; +#else + static u32 counter = 0; +#endif + + counter += 0x10000; + + /* read timestamp counter */ + /* + * Note that instead of actually trying to accurately measure this, we just + * increase the counter by a fixed amount every time we hit one of these + * instructions. Feel free to come up with a better method. + */ + START_OF_INSTR(); + DECODE_PRINTF("RDTSC\n"); + TRACE_AND_STEP(); +#ifdef __HAS_LONG_LONG__ + M.x86.R_EAX = counter & 0xffffffff; + M.x86.R_EDX = counter >> 32; +#else + M.x86.R_EAX = counter; + M.x86.R_EDX = 0; +#endif + DECODE_CLEAR_SEGOVR(); + END_OF_INSTR(); +} + +/**************************************************************************** * REMARKS: * Handles opcode 0x0f,0x32 * ****************************************************************************/ @@ -1728,7 +1762,7 @@ void (*x86emu_optab2[256])(u8) = /* 0x2f */ x86emuOp2_illegal_op, /* 0x30 */ x86emuOp2_wrmsr, -/* 0x31 */ x86emuOp2_illegal_op, +/* 0x31 */ x86emuOp2_rdtsc, /* 0x32 */ x86emuOp2_rdmsr, /* 0x33 */ x86emuOp2_illegal_op, /* 0x34 */ x86emuOp2_illegal_op, |