+MSTATUS_UIE = 0x00000001
+MSTATUS_SIE = 0x00000002
+MSTATUS_HIE = 0x00000004
+MSTATUS_MIE = 0x00000008
+MSTATUS_UPIE = 0x00000010
+MSTATUS_SPIE = 0x00000020
+MSTATUS_HPIE = 0x00000040
+MSTATUS_MPIE = 0x00000080
+MSTATUS_SPP = 0x00000100
+MSTATUS_HPP = 0x00000600
+MSTATUS_MPP = 0x00001800
+MSTATUS_FS = 0x00006000
+MSTATUS_XS = 0x00018000
+MSTATUS_MPRV = 0x00020000
+MSTATUS_PUM = 0x00040000
+MSTATUS_MXR = 0x00080000
+MSTATUS_VM = 0x1F000000
+MSTATUS32_SD = 0x80000000
+MSTATUS64_SD = 0x8000000000000000
+