RISCV ISA - HackMD

Reference:

RISCV spec

非特權指令集

最基本的指令集為 RV32I Base Integer Instruction Set，分為四個形式：R, I, S, U，之後又有了兩個擴充集：B, J

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特權指令集

Control and Status Register (CSRs)

Machine-Level ISA

Supervisor-Level ISA

這邊著重討論 supervisor-level

Supervisor Status Register, sstatus
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- SIE
- SPIE
- UBE
- SPP
- VS
- FS
- XS
- SUM
- MXR
- SD