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Yesterday, the RISC-V Foundation announced that the RISC-V base Instruction Set Architecture (ISA) and privileged architecture specifications have been ratified. 

The RISC-V Foundation drives the adoption and implementation of the free and open RISC-V ISA. The RISC-V base architecture acts as the interface between application software and hardware. 

Krste Asanović, chairman of the RISC-V Foundation Board of Directors says, “The RISC-V ecosystem has already demonstrated a large degree of interoperability among various implementations. Now that the base architecture has been ratified, developers can be assured that their software written for RISC-V will run on all similar RISC-V cores forever.”

The RISC-V privileged architecture covers all aspects of RISC-V systems including privileged instructions, additional functionality required for running operating systems and attaching external devices. Privilege levels are used to provide protection between different components of the software stack, such that it has a core set of privileged ISA extensions. The ISA extensions have optional extensions and variants, including the machine ISA, supervisor ISA and hypervisor ISA.


“The RISC-V privileged architecture serves as a contract between RISC-V hardware and software such as Linux and FreeBSD. Ratifying these standards is a milestone for RISC-V,” said Andrew Waterman, chair of the RISC-V Privileged Architecture Task Group. 

To know more about this announcement in detail, head over to RISC-V blog.

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