ext: add field mask for svukte (#374)

1. new HSTATUS_HUKTE and SENVCFG_UKTE
  2. reorder fields by ascending order

reference:
  https://github.com/riscv/riscv-isa-manual/pull/1564/files
  https://lists.riscv.org/g/tech-privileged/message/2668

Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>

Author: chihminchao

encoding.h

@@ -56,16 +56,17 @@
 #define SSTATUS_UXL         0x0000000300000000
 #define SSTATUS64_SD        0x8000000000000000
 
-#define HSTATUS_VSXL        0x300000000
-#define HSTATUS_VTSR        0x00400000
-#define HSTATUS_VTW         0x00200000
-#define HSTATUS_VTVM        0x00100000
-#define HSTATUS_VGEIN       0x0003f000
-#define HSTATUS_HU          0x00000200
-#define HSTATUS_SPVP        0x00000100
-#define HSTATUS_SPV         0x00000080
-#define HSTATUS_GVA         0x00000040
 #define HSTATUS_VSBE        0x00000020
+#define HSTATUS_GVA         0x00000040
+#define HSTATUS_SPV         0x00000080
+#define HSTATUS_SPVP        0x00000100
+#define HSTATUS_HU          0x00000200
+#define HSTATUS_VGEIN       0x0003f000
+#define HSTATUS_VTVM        0x00100000
+#define HSTATUS_VTW         0x00200000
+#define HSTATUS_VTSR        0x00400000
+#define HSTATUS_HUKTE       0x01000000
+#define HSTATUS_VSXL        0x0000000300000000
 #define HSTATUS_HUPMM       0x0003000000000000
 
 #define USTATUS_UIE         0x00000001
@@ -299,6 +300,7 @@
 #define SENVCFG_CBIE  0x00000030
 #define SENVCFG_CBCFE 0x00000040
 #define SENVCFG_CBZE  0x00000080
+#define SENVCFG_UKTE  0x00000100
 #define SENVCFG_PMM   0x0000000300000000
 
 #define SSTATEEN0_CS   0x00000001