We have implemented I2C and the first GPIO device in Rust for QEMU. Additionally, in the respective patches, we have shared our insights and experiences regarding the use of Rust for device modeling within QEMU.
1. The first patch implements the BusState for the I2CBus infrastructure. 2. The second patch implements the I2CBus and I2CSlave infrastructure, along with a discussion of the challenges encountered during the implementation. 3. The third patch moves the struct definition of the PCF8574 to the corresponding header file. 4. The fourth patch provides a set of necessary helper functions for the PCF8574 GPIO device. 5. The fifth patch implements the PCF8574 GPIO device, along with a discussion of the issues and considerations addressed during the implementation. Regarding this series of patches, we have found that Rust for QEMU is indeed still not mature enough and requires continuous iteration. Additionally, the lack of basic documentation also needs to be addressed. In this regard, I hope our team(HUST OpenAtom Open Source Club) can contribute to the documentation efforts for Rust for QEMU. Link: https://groups.google.com/g/hust-os-kernel-patches/c/z7vHWg3xvDc Signed-off-by: Chao Liu <[email protected]> Signed-off-by: Chen Miao <[email protected]> --- Changes in V2: - According to Zhao's suggestions, some modifications were made to the first and second patches respectively, such as changing some bus names, adding some Safety comments, and adding callbacks for I2CSlave. - While we were making changes to the first PATCH, Chao Liu pointed out that the realize function was unnecessary in the bus. After discussion, we removed the bus::realize function. Since no other components are currently using the bus, we added a TODO comment for clarification. chenmiao (5): rust/hw/core: Add the BusState of rust version rust/hw/core: Add rust bindings/funcs for i2c bus hw/gpio: Move the pcf8574 struct to header rust/hw/core: Provide some interfaces for the GPIO device rust/hw/gpio: Add the the first gpio device pcf8574 hw/gpio/Kconfig | 5 + hw/gpio/meson.build | 2 +- hw/gpio/pcf8574.c | 32 -- include/hw/gpio/pcf8574.h | 36 +++ rust/Cargo.lock | 21 +- rust/Cargo.toml | 1 + rust/hw/Kconfig | 1 + rust/hw/core/meson.build | 2 + rust/hw/core/src/bus.rs | 44 +++ rust/hw/core/src/i2c.rs | 421 +++++++++++++++++++++++++++ rust/hw/core/src/irq.rs | 6 +- rust/hw/core/src/lib.rs | 6 + rust/hw/core/src/qdev.rs | 12 +- rust/hw/core/wrapper.h | 1 + rust/hw/gpio/Kconfig | 2 + rust/hw/gpio/meson.build | 1 + rust/hw/gpio/pcf8574/Cargo.toml | 31 ++ rust/hw/gpio/pcf8574/build.rs | 1 + rust/hw/gpio/pcf8574/meson.build | 50 ++++ rust/hw/gpio/pcf8574/src/bindings.rs | 29 ++ rust/hw/gpio/pcf8574/src/device.rs | 180 ++++++++++++ rust/hw/gpio/pcf8574/src/lib.rs | 4 + rust/hw/gpio/pcf8574/wrapper.h | 51 ++++ rust/hw/meson.build | 1 + 24 files changed, 902 insertions(+), 38 deletions(-) create mode 100644 rust/hw/core/src/bus.rs create mode 100644 rust/hw/core/src/i2c.rs create mode 100644 rust/hw/gpio/Kconfig create mode 100644 rust/hw/gpio/meson.build create mode 100644 rust/hw/gpio/pcf8574/Cargo.toml create mode 120000 rust/hw/gpio/pcf8574/build.rs create mode 100644 rust/hw/gpio/pcf8574/meson.build create mode 100644 rust/hw/gpio/pcf8574/src/bindings.rs create mode 100644 rust/hw/gpio/pcf8574/src/device.rs create mode 100644 rust/hw/gpio/pcf8574/src/lib.rs create mode 100644 rust/hw/gpio/pcf8574/wrapper.h -- 2.43.0
