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RISC-V Open Source Supervisor Binary Interface
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Anup Patel 1bfa244505 lib: Fix delegate_traps() for Linux boot 
commit d403c70fb1 breaks Linux
booting because of fewer exceptions delegated to S-mode. This
patch fixes Linux booting by having all required exceptions
delegated to S-mode.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
2018-12-21 14:54:06 +05:30
docs/firmware top: Rename "blob" to "firmware" everywhere 2018-12-21 09:52:27 +05:30
firmware Fiw comment typo 2018-12-21 16:35:33 +09:00
include/sbi Introduce sbi_current_hartid() 2018-12-21 17:06:59 +09:00
lib lib: Fix delegate_traps() for Linux boot 2018-12-21 14:54:06 +05:30
platform Kendryte-k210: Remove unnecessary asm functions 2018-12-21 17:20:56 +09:00
.gitignore Added .gitignore 2018-12-20 14:41:36 +09:00
LICENSE Initial commit. 2018-12-11 19:24:06 +05:30
Makefile top: Rename "plat" to "platform" everywhere 2018-12-21 10:35:04 +05:30
README.md top: Rename "plat" to "platform" everywhere 2018-12-21 10:35:04 +05:30

README.md

RISC-V Open Source Supervisor Binary Interface (OpenSBI)

The RISC-V Supervisor Binary Interface (SBI) is a recommended interface between:

  1. Platform specific firmware running in M-mode and general-purpose-os/hypervisor/bootloader running in S-mode/HS-mode
  2. Hypervisor runnng in HS-mode and general-purpose-os/bootloader running in VS-mode

The RISC-V SBI specification is maintained as independent project by RISC-V Foundation on Github

The RISC-V OpenSBI project aims to provides an open-source and extensible implementation of the RISC-V SBI specification for point 1) mentioned above. It can be easily extended by RISC-V platform or RISC-V System-on-Chip vendors.

We can create three things using the RISC-V OpenSBI project:

  1. libsbi.a - Generic OpenSBI static library
  2. libplatsbi.a - Platform specific OpenSBI static library (It is libsbi.a plus platform specific hooks represented by "platform" symbol)
  3. firmwares - Platform specific firmware binaries

How to Build?

For cross-compiling, please ensure that CROSS_COMPILE environment variable is set before starting build system.

The libplatsbi.a and firmwares are optional and only built when PLATFORM=<platform_subdir> parameter is specified to top-level make. (NOTE: <platform_subdir> is sub-directory under platform/ directory)

To build and install Generic OpenSBI library do the following:

  1. Build libsbi.a: make OR make O=<build_directory>
  2. Install libsbi.a and headers: make install OR make I=<install_directory> install

To build and install platform specific OpenSBI library and firmwares do the following:

  1. Build libsbi, libplatsbi, and firmwares: make PLATFORM=<platform_subdir> OR make PLATFORM=<platform_subdir> O=<build_directory>
  2. Install libsbi, headers, libplatsbi, and firmwares: make PLATFORM=<platform_subdir> install OR make PLATFORM=<platform_subdir> I=<install_directory> install

In addition, we can also specify platform specific command-line options to top-level make (such as PLAT_<xyz> or FW_<abc>) which are described under docs/platform/<platform_name>.md OR docs/firmware/<firmware_name>.md.

Documentation

All our documenation is under docs directory organized in following manner:

  • docs/platform_guide.md - Guidelines for adding new platform support
  • docs/library_usage.md - Guidelines for using static library
  • docs/platform/<platform_name>.md - Documentation for <platform_name> platform
  • docs/firmware/<firmware_name>.md - Documentation for firmware <firmware_name>

We also prefer source level documentation, so wherever possible we describe stuff directly in the source code. This helps us maintain source and its documentation at the same place. For source level documentation we strictly follow Doxygen style. Please refer [Doxygen manual] (http://www.stack.nl/~dimitri/doxygen/manual.html) for details.