Trait DeviceMmio

Source

pub trait DeviceMmio {
    // Required methods
    fn mmio_read(
        &self,
        base: MmioAddress,
        offset: MmioAddressOffset,
        data: &mut [u8],
    );
    fn mmio_write(
        &self,
        base: MmioAddress,
        offset: MmioAddressOffset,
        data: &[u8],
    );
}

Expand description

Allows a device to be attached to a MMIO bus.

§Example

struct DummyDevice {
    config: Mutex<u32>,
}

impl DeviceMmio for DummyDevice {
    fn mmio_read(&self, _base: MmioAddress, _offset: MmioAddressOffset, data: &mut [u8]) {
        if data.len() > 4 {
            return;
        }
        for (idx, iter) in data.iter_mut().enumerate() {
            let config = self.config.lock().expect("failed to acquire lock");
            *iter = (*config >> (idx * 8) & 0xff) as u8;
        }
    }

    fn mmio_write(&self, _base: MmioAddress, _offset: MmioAddressOffset, data: &[u8]) {
        let mut config = self.config.lock().expect("failed to acquire lock");
        *config = u32::from(data[0]) & 0xff;
    }
}