RV32I,V2.1,批准(Ratified):基础的32位整数指令集,32位地址空间,寄存器是32位。 RV64I,V2.1,批准(Ratified):基础的64位整数指令集,64位地址空间,寄存器是64位。 RV32E,V1.9,草案(Draft):嵌入式架构,仅有16个整数寄存器。 RV128I,V1.7,草案(Draft):基础的的128位整数指令集,支持128位地址空间。 扩展模...
We briefly note that the entire privileged-level design described in this document could be replaced with an entirely different privileged-level design without changing the unprivileged ISA, and possibly without even changing the ABI. In particular, this privileged specification was designed to run exis...
BERKELEY, Calif.-- July 10, 2019 -- The RISC-V Foundation, a non-profit corporation controlled by its members to drive the adoption and implementation of the free and open RISC-V instruction set architecture (ISA), today announced the ratification of the RISC-V base ISA and privileged ...
所以RISC-V没有像早期的ARM虚拟化一样把虚拟化异常直接直接加到supervisor mode和machine mode之间,而是定义了独立的virtualization mode,这个mode再与user和supervisor mode组合,于是有了下面的表格。 (表格来自The RISC-V Instruction Set Manual, Volume II: Privileged Architecture, Document Version 1.12-draft Table...
RISC-V base ISAs have eitherlittle-endianorbig-endianmemory systems, with the privileged architecture further defining bi-endian operation. Note: Instructions are stored in memory as a sequence of 16-bit little-endian parcels, regardless of memory system endianness. We have to fix the order in ...
The QEMU RISC-V port was being developed and maintained out-of-tree for several years by Sagar Karandikar and Bastian Koppelmann. The RISC-V Privileged specification evolved substantially over this period and SiFive joined the porting effort and asked me to help prepare the RISC-V port for revi...
开发者应根据具体需求选择合适的中断控制器,或结合两者构建更灵活的系统。随着RISC-V生态的发展,PLIC和ECLIC的功能可能会进一步扩展,为更多应用场景提供支持。 参考文献 RISC-V Privileged Specification RISC-V PLIC标准文档 RISC-V ECLIC技术手册 ”` 注:本文为技术概述,实际实现可能因具体硬件或软件平台而异。建议结...
RISC-V Privileged ISA Specification https://riscv.org/specifications/privileged-isa/ Instruction Aliases ALIAS line from opcodes/riscv-opc.c To better diagnose situations where the program flow reaches an unexpected location, you might want to emit there an instruction that's known to trap. You...
“core”. Broadly speaking, the number of cores in a given CPU quantifies the number of things it can do at the same time (i.e. in parallel). The RISC-V privileged specification generalizes this concept with the notion of “Hardware Threads” (harts). One of the roles of an ...
Volume 2 of theRISC-V ISA specification, or “The Privileged Spec”, defines offered privilege levels. In simplest terms, RISC-V offers three levels of privilege, ormodes, which systems can choose to support in different configurations. The three basic modes include: ...