General
- Move to Microkit 1.4.0.
- Previously a development version of Microkit was used, now we use
an official release for everything.
- Previously a development version of Microkit was used, now we use
- Add QEMU support to the timer and echo server examples.
- Remove dependency on a full libc, all the provided components use our own
utility functions now. - Transition to a modular 'Makefile snippets' build system structure to
simplify the composition of sDDF components. - Introduce snippets for the Zig build system, as an alternative to Make.
- Instructions for using the Zig build system can be found in each
example's README. - No components are solely built with Zig, the primary build system is
still Make.
- Instructions for using the Zig build system can be found in each
- Introduce configurable printf logging for debug versus release mode, making
it easier to have some components continue logging to the serial in release
mode.
Block
- Move the capacity of the shared queue out of shared memory
and into the queue handles. This prevents malicious clients
from messing with the queue size and potentially causing the
virtualiser or other trusted components to crash/misbehave. - Introduce a config header to enable the system designer to have a variable
amount of clients, previously it was all hard-coded.- It should be noted that we are working on tooling to automate this process
and these configs are likely to significantly change by the next release.
- It should be noted that we are working on tooling to automate this process
- Change block virtualiser to use offsets when interfacing with clients and DMA
physical addresses when interfacing with the driver.- This makes the block system consistent with the networking system in how it
handles client-to-driver address translation.
- This makes the block system consistent with the networking system in how it
- Use 'capacity' instead of size in the shared queue library to avoid confusion.
I2C
- Use 'capacity' instead of size in the shared queue library to avoid confusion.
Network
- Add a virtIO network driver.
- This allows us to have networking on QEMU making it easier to simulate
non-trivial systems.
- This allows us to have networking on QEMU making it easier to simulate
- Change RX virtualiser policy for broadcast packets.
- Previously all broadcast packets would go to the ARP component, now the
default policy is to forward broadcast packets to all clients. - We have only run into this becoming necessary so far when simulating our
systems using QEMU since its internal DHCP server sends broadcast packets.
- Previously all broadcast packets would go to the ARP component, now the
- Introduce a config header to enable the system designer to have a variable
amount of clients, previously it was all hard-coded.- It should be noted that we are working on tooling to automate this process
and these configs are likely to significantly change by the next release.
- It should be noted that we are working on tooling to automate this process
- Fix caching operations in RX virtualiser, previously this would lead to
issues with TCP traffic. - Various bug fixes in the Amlogic ethernet driver.
- Fixes and changes for improved TCP performance.
Serial
- Redesign the entire sub-system.
- The serial device class was previously following
the network design which was not an ideal design for serial devices. This new
design is intended to be used for character-by-character devices. DMA
capable serial devices will have a separate design, more aligned with the design
of our other DMA capable devices such as ethernet and block. - Various bugs were fixed and so individual drivers as well as the system
as a whole should be more stable.
- The serial device class was previously following
- Introduce a config header to enable the system designer to have a variable
amount of clients, previously it was all hard-coded.- It should be noted that we are working on tooling to automate this process
and these configs are likely to significantly change by the next release.
- It should be noted that we are working on tooling to automate this process
Sound
This release adds the initial sound virtualiser and shared queue library.
We do not yet have any native sound drivers.
See the design document for the specification and more information.
Timer
- Add a driver for the ARM architectural timer (necessary for QEMU on ARM).
- Various cleanup/refactoring of all the drivers to simplify their implementation
and fix bugs.