logo资料库

13.30-RISCV_OpenSBI_Deep_Dive_v5.pdf

发布时间：2022-05-30 发布人：admin 分类：说明书 资料大小：1.09M 资料格式：pdf 举报 版权申诉
第1页 / 共24页
第2页 / 共24页
第3页 / 共24页
第4页 / 共24页
第5页 / 共24页
第6页 / 共24页
第7页 / 共24页
第8页 / 共24页
资料共24页，剩余部分请下载后查看
    OpenSBI Deep Dive Anup Patel Western Digital Research
    Outline • OpenSBI Introduction – Overview and features • OpenSBI Platform Specific Support • OpenSBI Usage – As a firmware: Reference Firmwares – As a library: API • Conclusion
    OpenSBI Introduction © 2019 Western Digital Corporation or its affiliates. All rights reserved. 6/12/2019 3
    What is SBI ? • SBI stands for RISC-V Supervisor Binary Interface – System call style calling convention between Supervisor (S-mode OS) and Supervisor Execution Environment (SEE) • SEE can be: – A M-mode RUNTIME firmware for OS/Hypervisor running in HS-mode – A HS-mode Hypervisor for Guest OS running in VS-mode • SBI calls help: App1 ABI App2 ABI OS (S-Mode) SBI SEE (M-Mode) – Reduce duplicate platform code across OSes (Linux, FreeBSD, etc) – Provide common drivers for an OS which can be shared by multiple platforms – Provide an interface for direct access to hardware resources (M-mode only resources) • Specifications being drafted by the Unix Platform Specification Working group – Maintain and evolve the SBI specifications – Currently, SBI v0.1 in-use and SBI v0.2 in draft stage © 2019 Western Digital Corporation or its affiliates. All rights reserved. 6/12/2019 4
    What is OpenSBI ? • OpenSBI is an open-source implementation of the RISC-V Supervisor Binary Interface (SBI) specifications – Licensed under the terms of the BSD-2 clause license – Helps to avoid SBI implementation fragmentation • Aimed at providing RUNTIME services in M-mode – Typically used in boot stage following ROM/LOADER • Provides support for reference platforms – Generic simple drivers included for M-mode to operate  PLIC, CLINT, UART 8250 – Other platforms can reuse the common code and add needed drivers © 2019 Western Digital Corporation or its affiliates. All rights reserved. 6/12/2019 5
    Typical Boot Flow Authenticate & Loads Jumps • Runs from On-Chip SRAM • DDR initialization • Loads RUNTIME and BOOTLOADER • Runs from DDR • Typically open-source • Filesystem support • Network booting • Boot configuration • Lots of other features ROM LOADER RUNTIME (OpenSBI) BOOTLOADER OS • Runs from On-Chip ROM • Uses On-Chip SRAM • SOC power-up and clock setup • Runs from DDR • SOC security setup • Runtime services as-per specifications © 2019 Western Digital Corporation or its affiliates. All rights reserved. 6/12/2019 6
    Important Features • Layered structure to accommodate various use cases – Generic SBI library with platform abstraction • Typically used with external firmware and bootloader – EDK2 (UEFI implementation), Secure boot working group – Platform specific library • Similar to core library but including platform specific drivers – Platform specific reference firmware • Three different types of RUNTIME firmware • Wide range of hardware features supported – RV32 and RV64 – Misaligned load/store handling – Missing CSR emulation – Protects firmware using PMP support • Well documented using Doxygen OpenSBI Layers Platform Specific Reference Firmware Platform Specific Library SBI Library © 2019 Western Digital Corporation or its affiliates. All rights reserved. 6/12/2019 7
    OpenSBI Platform Specific Support © 2019 Western Digital Corporation or its affiliates. All rights reserved. 6/12/2019 8
    分享到：
    赞 收藏

    相关推荐

    资料库

    开发技术

    共收录19306份资料，累计14个分类，关注成员有19位，主要包括：Actionscript,Javascript,PHP,VB,Perl,Delphi,Python,C#,C,Java,C++,Web开发,硬件开发,其它

    热门标签

    Actionscript Javascript PHP VB Perl Delphi Python C# C Java C++ Web开发 硬件开发 其它

    最新资料