X-Git-Url: https://git.reactos.org/?p=reactos.git;a=blobdiff_plain;f=lib%2Ffast486%2Fextraops.c;h=7c6da5e9c064d11aa279052cf7ff42ca8480ee24;hp=8ac7fc2d6fb4a1127371d4809e6e5aa4686667cd;hb=dfd1c031d679b6425d6f7827989f66895f68412e;hpb=1525a235a2782ff962c24577f7adea40c23a85c6

diff --git a/lib/fast486/extraops.c b/lib/fast486/extraops.c
index 8ac7fc2d6fb..7c6da5e9c06 100644
--- a/lib/fast486/extraops.c
+++ b/lib/fast486/extraops.c
@@ -45,7 +45,7 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
     NULL, // TODO: OPCODE 0x03 NOT IMPLEMENTED
     NULL, // TODO: OPCODE 0x04 NOT IMPLEMENTED
     NULL, // TODO: OPCODE 0x05 NOT IMPLEMENTED
-    NULL, // TODO: OPCODE 0x06 NOT IMPLEMENTED
+    Fast486ExtOpcodeClts,
     NULL, // TODO: OPCODE 0x07 NOT IMPLEMENTED
     NULL, // TODO: OPCODE 0x08 NOT IMPLEMENTED
     NULL, // TODO: OPCODE 0x09 NOT IMPLEMENTED
@@ -299,6 +299,23 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
 
 /* PUBLIC FUNCTIONS ***********************************************************/
 
+FAST486_OPCODE_HANDLER(Fast486ExtOpcodeClts)
+{
+    NO_LOCK_PREFIX();
+
+    /* The current privilege level must be zero */
+    if (Fast486GetCurrentPrivLevel(State) != 0)
+    {
+        Fast486Exception(State, FAST486_EXCEPTION_GP);
+        return FALSE;
+    }
+
+    /* Clear the task switch bit */
+    State->ControlRegisters[FAST486_REG_CR0] &= ~FAST486_CR0_TS;
+
+    return TRUE;
+}
+
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodeStoreControlReg)
 {
     BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;