x86: Fix setting segment bases in real mode.

The data size used for actually writing the base value for the segment was the
default size, but really it should set the entire value without any possible
truncation.

src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py

@@ -145,7 +145,7 @@ def macroop JMP_FAR_REAL_M
     zexti t3, t1, 15, dataSize=8
     slli t3, t3, 4, dataSize=8
     wrsel cs, t1, dataSize=2
-    wrbase cs, t3
+    wrbase cs, t3, dataSize=8
     wrip t0, t2, dataSize=asz
 };
 
@@ -168,7 +168,7 @@ def macroop JMP_FAR_REAL_I
     mov t2, t0, t2
     slli t3, t1, 4, dataSize=8
     wrsel cs, t1, dataSize=2
-    wrbase cs, t3
+    wrbase cs, t3, dataSize=8
     wrip t0, t2, dataSize=asz
 };
 '''

src/arch/x86/isa/insts/general_purpose/data_transfer/move.py

@@ -215,7 +215,7 @@ def macroop MOV_REAL_S_R {
     zexti t2, regm, 15, dataSize=8
     slli t3, t2, 4, dataSize=8
     wrsel reg, regm
-    wrbase reg, t3
+    wrbase reg, t3, dataSize=8
 };
 
 def macroop MOV_REAL_S_M {
@@ -223,7 +223,7 @@ def macroop MOV_REAL_S_M {
     zexti t2, t1, 15, dataSize=8
     slli t3, t2, 4, dataSize=8
     wrsel reg, t1
-    wrbase reg, t3
+    wrbase reg, t3, dataSize=8
 };
 
 def macroop MOV_REAL_S_P {