Method read

devices/src/tpm.rs:351–386

(&mut self, _base: u64, offset: u64, data: &mut [u8])

impl BusDevice for Tpm {
    fn read(&mut self, _base: u64, offset: u64, data: &mut [u8]) {
        let mut offset: u32 = offset as u32;
        let read_len: usize = data.len();

        if offset >= CRB_DATA_BUFFER
            && (offset + read_len as u32) < (CRB_DATA_BUFFER + self.data_buff.len() as u32)
        {
            // Read from Data Buffer
            let start: usize = (offset as usize) - (CRB_DATA_BUFFER as usize);
            let end: usize = start + read_len;
            data[..].clone_from_slice(&self.data_buff[start..end]);
        } else {
            offset &= 0xff;
            let mut val = self.regs[offset as usize];

            if offset == CRB_LOC_STATE && !self.emulator.get_established_flag() {
                val |= 0x1;
            }

            if data.len() <= 4 {
                data.clone_from_slice(val.to_ne_bytes()[0..read_len].as_ref());
            } else {
                error!(
                    "Invalid tpm read: offset {:#X}, data length {:?}",
                    offset,
                    data.len()
                );
            }
        }
        debug!(
            "MMIO Read: offset {:#X} len {:?} val = {:02X?}  ",
            offset,
            data.len(),
            data
        );
    }

    fn write(&mut self, _base: u64, offset: u64, data: &[u8]) -> Option<Arc<Barrier>> {
        debug!(