2021-09-28 23:09:38 +00:00
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use std::fs;
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use crate::error::Error;
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2021-10-18 19:05:10 +00:00
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use crate::devices::{Address, Addressable, Transmutable, TransmutableBox, MAX_READ};
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2021-09-28 23:09:38 +00:00
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2021-09-30 06:21:11 +00:00
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pub struct MemoryBlock {
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2021-09-28 23:09:38 +00:00
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pub contents: Vec<u8>,
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}
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2021-09-30 06:21:11 +00:00
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impl MemoryBlock {
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pub fn new(contents: Vec<u8>) -> MemoryBlock {
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MemoryBlock {
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contents
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2021-09-28 23:09:38 +00:00
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}
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}
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2021-09-30 06:21:11 +00:00
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pub fn load(filename: &str) -> Result<MemoryBlock, Error> {
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2021-09-28 23:09:38 +00:00
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match fs::read(filename) {
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2021-09-30 06:21:11 +00:00
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Ok(contents) => Ok(MemoryBlock::new(contents)),
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2021-09-28 23:09:38 +00:00
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Err(_) => Err(Error::new(&format!("Error reading contents of {}", filename))),
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}
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}
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2021-10-03 16:55:20 +00:00
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pub fn load_at(&mut self, mut addr: Address, filename: &str) -> Result<(), Error> {
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match fs::read(filename) {
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Ok(contents) => {
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for byte in contents {
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self.contents[addr as usize] = byte;
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addr += 1;
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}
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Ok(())
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},
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Err(_) => Err(Error::new(&format!("Error reading contents of {}", filename))),
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}
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}
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2021-09-28 23:09:38 +00:00
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}
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2021-09-30 06:21:11 +00:00
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impl Addressable for MemoryBlock {
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fn len(&self) -> usize {
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self.contents.len()
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}
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2021-10-27 00:33:23 +00:00
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fn read(&mut self, addr: Address, data: &mut [u8]) -> Result<(), Error> {
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for i in 0..data.len() {
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2021-10-16 17:58:27 +00:00
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data[i] = self.contents[(addr as usize) + i];
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}
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2021-10-27 00:33:23 +00:00
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Ok(())
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2021-09-28 23:09:38 +00:00
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}
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2021-10-06 02:58:22 +00:00
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fn write(&mut self, mut addr: Address, data: &[u8]) -> Result<(), Error> {
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2021-09-28 23:09:38 +00:00
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for byte in data {
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2021-09-30 06:21:11 +00:00
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self.contents[addr as usize] = *byte;
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2021-09-30 04:52:38 +00:00
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addr += 1;
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2021-09-28 23:09:38 +00:00
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}
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2021-10-06 02:58:22 +00:00
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Ok(())
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2021-09-28 23:09:38 +00:00
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}
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}
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2021-10-17 17:39:43 +00:00
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impl Transmutable for MemoryBlock {
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fn as_addressable(&mut self) -> Option<&mut dyn Addressable> {
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Some(self)
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2021-10-06 23:14:56 +00:00
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}
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}
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2021-09-28 23:09:38 +00:00
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2021-10-17 17:39:43 +00:00
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2021-10-06 23:14:56 +00:00
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pub struct Block {
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2021-09-30 06:21:11 +00:00
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pub base: Address,
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2021-10-06 23:14:56 +00:00
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pub length: usize,
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2021-10-17 17:39:43 +00:00
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pub dev: TransmutableBox,
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2021-09-30 06:21:11 +00:00
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}
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2021-10-06 23:14:56 +00:00
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pub struct Bus {
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pub blocks: Vec<Block>,
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2021-10-27 00:33:23 +00:00
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pub address_mask: Address,
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2021-09-30 06:21:11 +00:00
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}
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2021-10-06 23:14:56 +00:00
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impl Bus {
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pub fn new() -> Bus {
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Bus {
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blocks: vec!(),
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2021-10-27 00:33:23 +00:00
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address_mask: !0,
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2021-10-20 02:50:42 +00:00
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}
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}
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2021-10-27 00:33:23 +00:00
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pub fn set_address_bits(&mut self, bits: u8) {
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self.address_mask = 0;
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2021-10-20 02:50:42 +00:00
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for _ in 0..bits {
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2021-10-27 00:33:23 +00:00
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self.address_mask = (self.address_mask << 1) | 0x01;
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2021-09-28 23:09:38 +00:00
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}
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}
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2021-10-17 17:39:43 +00:00
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pub fn insert(&mut self, base: Address, length: usize, dev: TransmutableBox) {
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2021-10-06 23:14:56 +00:00
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let block = Block { base, length, dev };
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for i in 0..self.blocks.len() {
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if self.blocks[i].base > block.base {
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self.blocks.insert(i, block);
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2021-09-28 23:09:38 +00:00
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return;
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}
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}
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2021-10-06 23:14:56 +00:00
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self.blocks.insert(0, block);
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2021-09-28 23:09:38 +00:00
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}
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2021-10-17 17:39:43 +00:00
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pub fn get_device_at(&self, addr: Address, count: usize) -> Result<(TransmutableBox, Address), Error> {
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2021-10-27 00:33:23 +00:00
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let addr = addr & self.address_mask;
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2021-10-06 23:14:56 +00:00
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for block in &self.blocks {
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if addr >= block.base && addr <= (block.base + block.length as Address) {
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let relative_addr = addr - block.base;
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if relative_addr as usize + count <= block.length {
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2021-10-07 16:41:01 +00:00
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return Ok((block.dev.clone(), relative_addr));
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2021-10-06 23:14:56 +00:00
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} else {
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return Err(Error::new(&format!("Error reading address {:#010x}", addr)));
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}
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2021-09-28 23:09:38 +00:00
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}
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}
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2021-09-30 04:52:38 +00:00
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return Err(Error::new(&format!("No segment found at {:#08x}", addr)));
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2021-09-28 23:09:38 +00:00
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}
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2021-10-07 16:41:01 +00:00
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pub fn dump_memory(&mut self, mut addr: Address, mut count: Address) {
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while count > 0 {
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let mut line = format!("{:#010x}: ", addr);
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let to = if count < 16 { count / 2 } else { 8 };
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for _ in 0..to {
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let word = self.read_beu16(addr);
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if word.is_err() {
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println!("{}", line);
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return;
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}
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line += &format!("{:#06x} ", word.unwrap());
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addr += 2;
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count -= 2;
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}
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println!("{}", line);
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}
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}
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}
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impl Addressable for Bus {
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fn len(&self) -> usize {
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2021-10-06 23:14:56 +00:00
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let block = &self.blocks[self.blocks.len() - 1];
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2021-10-07 16:41:01 +00:00
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(block.base as usize) + block.length
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}
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2021-10-27 00:33:23 +00:00
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fn read(&mut self, addr: Address, data: &mut [u8]) -> Result<(), Error> {
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let (dev, relative_addr) = self.get_device_at(addr, data.len())?;
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let result = dev.borrow_mut().as_addressable().unwrap().read(relative_addr, data);
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2021-10-07 16:41:01 +00:00
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result
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}
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fn write(&mut self, addr: Address, data: &[u8]) -> Result<(), Error> {
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let (dev, relative_addr) = self.get_device_at(addr, data.len())?;
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2021-10-17 17:39:43 +00:00
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let result = dev.borrow_mut().as_addressable().unwrap().write(relative_addr, data);
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2021-10-07 16:41:01 +00:00
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result
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2021-09-30 19:58:11 +00:00
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}
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2021-10-06 02:58:22 +00:00
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}
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2021-09-30 19:58:11 +00:00
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