It has been recognized that there is need to officially standardize a "B" extension - that represents the collection of the Zba, Zbb, and Zbs extensions - for the sake of consistency and conciseness across toolchains and how they identify support for these bitmanip extensions (which, for example, are mandated in RVA and RVB profiles). In conjunction with this an official definition of the misa.B bit will be established - along the lines of misa.B=1 indicating support for at least these three extensions (and misa.B=0 indicating that one or more may not be supported).
This work is licensed under a Creative Commons Attribution 4.0 International License (CC-BY-4.0). For details, see the LICENSE file.
The list of contributors to this specification is maintained in the contributors file.
For guidelines on how to contribute, refer to the CONTRIBUTING file.
To build the document, you’ll need the following tools installed on your system:
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Make
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asciiDoctor-pdf, asciidoctor-bibtex, asciidoctor-diagram and asciidoctor-mathematical
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Docker
git clone --recurse-submodules https://github.com/riscv/riscv-b.git
To start the build process, run cd ./riscv-b && make build.
The Makefile script will check the availability of Docker on your system:
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If Docker is available, the documentation will be built inside a Docker container using the image riscvintl/riscv-docs-base-container-image:latest. This ensures a consistent build environment across different systems.
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If Docker is not available, the documentation will be built directly on your system using the installed tools.
The documentation is generated from the AsciiDoctor source files in your project. The primary source file is specified by the HEADER_SOURCE variable in the Makefile.
The build process utilizes several options, including theming and font settings, and generates a PDF document as output.