Trait vm_device::MutDeviceMmio

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

Same as DeviceMmio but the methods are invoked with a mutable self borrow.

Example

struct DummyDevice {
    config: u32,
}

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

    fn mmio_write(&mut self, _base: MmioAddress, _offset: MmioAddressOffset, data: &[u8]) {
        self.config = u32::from(data[0]) & 0xff;
    }
}

Required methods

fn mmio_read(
    &mut self,
    base: MmioAddress,
    offset: MmioAddressOffset,
    data: &mut [u8]
)

Handle a read operation on the device.

Arguments

• base: base address on a MMIO bus
• offset: base address’ offset
• data: a buffer provided by the caller to store the read data

fn mmio_write(
    &mut self,
    base: MmioAddress,
    offset: MmioAddressOffset,
    data: &[u8]
)

Handle a write operation to the device.

Arguments

• base: base address on a MMIO bus
• offset: base address’ offset
• data: a buffer provided by the caller holding the data to write

Implementors