alioth/src/pci/pvpanic.rs - 74e0be5

pvpanic.rs88.24%

// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
use std::sync::Arc;
 
use crate::bitflags;
use crate::device::{self, Pause};
use crate::mem::emulated::{Action, Mmio};
use crate::mem::{self, MemRegion};
use crate::pci::cap::PciCapList;
use crate::pci::config::{
    BAR_MEM64, BAR_PREFETCHABLE, CommonHeader, DeviceHeader, EmulatedConfig, HeaderType, PciConfig,
};
use crate::pci::{self, Pci, PciBar};
 
bitflags! {
    struct PvPanicByte(u8) {
        PANICKED = 1 << 0;
        CRASH_LOADED = 1 << 1;
    }
}
 
pub const PVPANIC_VENDOR_ID: u16 = 0x1b36;
pub const PVPANIC_DEVICE_ID: u16 = 0x0011;
 
const BAR_SIZE: u64 = 0x1000;
 
#[derive(Debug)]
struct PvPanicBar;
 
impl Mmio for PvPanicBar {
    fn size(&self) -> u64 {75x
        BAR_SIZE75x
    }75x
 
    fn read(&self, _offset: u64, _size: u8) -> mem::Result<u64> {3x
        Ok(PvPanicByte::all().bits() as u64)3x
    }3x
 
    fn write(&self, _offset: u64, _size: u8, val: u64) -> mem::Result<Action> {3x
        log::info!("pvpanic: {:x?}", PvPanicByte::from_bits_retain(val as u8));3x
        Ok(Action::Shutdown)3x
    }3x
}
 
#[derive(Debug)]
pub struct PvPanic {
    pub config: EmulatedConfig,
}
 
impl PvPanic {
    pub fn new() -> Self {75x
        let header = DeviceHeader {75x
            common: CommonHeader {75x
                vendor: PVPANIC_VENDOR_ID,75x
                device: PVPANIC_DEVICE_ID,75x
                revision: 1,75x
                header_type: HeaderType::DEVICE,75x
                class: 0x08,75x
                subclass: 0x80,75x
                ..Default::default()75x
            },75x
            bars: [BAR_MEM64 | BAR_PREFETCHABLE, 0, 0, 0, 0, 0],75x
            ..Default::default()75x
        };75x
        let bar0 = PciBar::Mem(Arc::new(MemRegion::with_emulated(75x
            Arc::new(PvPanicBar),75x
            mem::MemRegionType::Hidden,75x
        )));75x
        let mut bars = [const { PciBar::Empty }; 6];75x
        bars[0] = bar0;75x
        let config = EmulatedConfig::new_device(header, bars, PciCapList::new());75x
        PvPanic { config }75x
    }75x
}
 
impl Default for PvPanic {
    fn default() -> Self {36x
        PvPanic::new()36x
    }36x
}
 
impl Pause for PvPanic {
    fn pause(&self) -> device::Result<()> {
        Ok(())
    }
 
    fn resume(&self) -> device::Result<()> {
        Ok(())
    }
}
 
impl Pci for PvPanic {
    fn name(&self) -> &str {36x
        "pvpanic"36x
    }36x
 
    fn config(&self) -> &dyn PciConfig {60x
        &self.config60x
    }60x
 
    fn reset(&self) -> pci::Result<()> {36x
        Ok(())36x
    }36x
}
 
#[cfg(test)]
#[path = "pvpanic_test.rs"]
mod tests;
 