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RISC-V Open Source Supervisor Binary Interface
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Anup Patel ab5b228ff5 lib: sbi_hart: Remove unwanted sbi_printf() 
This patch removes unwanted sbi_printf() from
sbi_hart_wait_for_coldboot().

Signed-off-by: Anup Patel <anup.patel@wdc.com>
2018-12-21 07:51:59 +05:30
blob Use wfi for coldboot finish call. 2018-12-20 15:55:27 -08:00
docs/blob docs: Add documentation for firmware blobs 2018-12-21 07:28:33 +05:30
include/sbi Use wfi for coldboot finish call. 2018-12-20 15:55:27 -08:00
lib lib: sbi_hart: Remove unwanted sbi_printf() 2018-12-21 07:51:59 +05:30
plat Fix baud rate divisor computation for U540. 2018-12-20 15:38:43 -08:00
.gitignore Added .gitignore 2018-12-20 14:41:36 +09:00
LICENSE Initial commit. 2018-12-11 19:24:06 +05:30
Makefile Initial commit. 2018-12-11 19:24:06 +05:30
README.md top: More detailed top-level README.md 2018-12-21 07:28:33 +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. blobs - Platform specific firware blobs

How to Build?

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

The libplatsbi.a and blobs are optional and only built when PLAT=<platform_subdir> parameter is specified to top-level make. (NOTE: <platform_subdir> is sub-directory under plat/ 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 blobs do the following:

  1. Build libsbi, libplatsbi, and blobs: make PLAT=<platform_subdir> OR make PLAT=<platform_subdir> O=<build_directory>
  2. Install libsbi, headers, libplatsbi, and blobs: make PLAT=<platform_subdir> install OR make PLAT=<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/plat/<platform_name>.md OR docs/blob/<blob_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/plat/<platform_name>.md - Documentation for <platform_name> platform
  • docs/blob/<blob_name>.md - Documentation for firmware blob <blob_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.