mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
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88a9f79944
Historically the Cloud Hypervisor coding style has been to ensure that all imports are ordered and placed in a single group. Unfortunately cargo fmt has no support for ensuring that all imports are in a single group so if whitespace lines were added as part of the import statements then they would only be odered correctly in the group. By adopting "group_imports="StdExternalCrate" we can enforce a style where imports are placed in at most three groups for std, external crates and the crate itself. Choosing a style enforceable by the tooling reduces the reviewer burden. Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE-BSD-3-Clause file.
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//
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// Copyright © 2020 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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//
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use std::sync::{Arc, Barrier};
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use vm_device::BusDevice;
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/// Provides firmware debug output via I/O port controls
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#[derive(Default)]
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pub struct FwDebugDevice {}
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impl FwDebugDevice {
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pub fn new() -> Self {
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Self {}
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}
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}
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/// FwDebugDevice sits on the I/O bus as 0x402 and receives ASCII characters
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impl BusDevice for FwDebugDevice {
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/// Upon read return the magic value to indicate that there is a debug port
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fn read(&mut self, _base: u64, _offset: u64, data: &mut [u8]) {
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if data.len() == 1 {
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data[0] = 0xe9
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} else {
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error!("Invalid read size on debug port: {}", data.len())
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}
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}
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fn write(&mut self, _base: u64, _offset: u64, data: &[u8]) -> Option<Arc<Barrier>> {
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if data.len() == 1 {
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print!("{}", data[0] as char);
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} else {
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error!("Invalid write size on debug port: {}", data.len())
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}
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None
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}
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}
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