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-rw-r--r--hw/xfree86/x86emu/ops2.c36
1 files changed, 35 insertions, 1 deletions
diff --git a/hw/xfree86/x86emu/ops2.c b/hw/xfree86/x86emu/ops2.c
index 7b0156aaa..8c6c53539 100644
--- a/hw/xfree86/x86emu/ops2.c
+++ b/hw/xfree86/x86emu/ops2.c
@@ -65,6 +65,40 @@ static void x86emuOp2_illegal_op(
/****************************************************************************
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,0x80-0x8F
****************************************************************************/
static void x86emuOp2_long_jump(u8 op2)
@@ -2580,7 +2614,7 @@ void (*x86emu_optab2[256])(u8) =
/* 0x2f */ x86emuOp2_illegal_op,
/* 0x30 */ x86emuOp2_illegal_op,
-/* 0x31 */ x86emuOp2_illegal_op,
+/* 0x31 */ x86emuOp2_rdtsc,
/* 0x32 */ x86emuOp2_illegal_op,
/* 0x33 */ x86emuOp2_illegal_op,
/* 0x34 */ x86emuOp2_illegal_op,