bjorn3
112 lines
5.1 KiB
Rust
112 lines
5.1 KiB
Rust
use amlserde::{AmlSerde, AmlSerdeValue};
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use std::{error::Error, fs, process::Command};
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use super::Backend;
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pub struct AcpiBackend {
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rxsdt: Vec<u8>,
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}
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impl Backend for AcpiBackend {
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fn new() -> Result<Self, Box<dyn Error>> {
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let rxsdt = fs::read("/scheme/kernel.acpi/rxsdt")?;
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// Spawn acpid
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//TODO: pass rxsdt data to acpid?
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#[allow(deprecated, reason = "we can't yet move this to init")]
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daemon::Daemon::spawn(Command::new("acpid"));
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Ok(Self { rxsdt })
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}
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fn probe(&mut self) -> Result<(), Box<dyn Error>> {
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// Read symbols from acpi scheme
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let entries = fs::read_dir("/scheme/acpi/symbols")?;
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// TODO: Reimplement with getdents?
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let symbols_fd = libredox::Fd::open(
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"/scheme/acpi/symbols",
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libredox::flag::O_DIRECTORY | libredox::flag::O_RDONLY,
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0,
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)?;
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for entry_res in entries {
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let entry = entry_res?;
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if let Some(file_name) = entry.file_name().to_str() {
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if file_name.ends_with("_CID") || file_name.ends_with("_HID") {
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let symbol_fd = symbols_fd.openat(file_name, libredox::flag::O_RDONLY, 0)?;
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let stat = symbol_fd.stat()?;
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let mut buf: Vec<u8> = vec![0u8; stat.st_size as usize];
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let count = symbol_fd.read(&mut buf)?;
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buf.truncate(count);
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let ron = String::from_utf8(buf)?;
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let AmlSerde { name, value } = ron::from_str(&ron)?;
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let id = match value {
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AmlSerdeValue::Integer(integer) => {
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let vendor = integer & 0xFFFF;
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let device = (integer >> 16) & 0xFFFF;
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let vendor_rev = ((vendor & 0xFF) << 8) | vendor >> 8;
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let vendor_1 = (((vendor_rev >> 10) & 0x1f) as u8 + 64) as char;
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let vendor_2 = (((vendor_rev >> 5) & 0x1f) as u8 + 64) as char;
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let vendor_3 = (((vendor_rev >> 0) & 0x1f) as u8 + 64) as char;
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//TODO: simplify this nibble swap
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let device_1 = (device >> 4) & 0xF;
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let device_2 = (device >> 0) & 0xF;
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let device_3 = (device >> 12) & 0xF;
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let device_4 = (device >> 8) & 0xF;
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format!(
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"{}{}{}{:01X}{:01X}{:01X}{:01X}",
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vendor_1,
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vendor_2,
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vendor_3,
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device_1,
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device_2,
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device_3,
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device_4
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)
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}
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AmlSerdeValue::String(string) => string,
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_ => {
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log::warn!("{}: unsupported value {:x?}", name, value);
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continue;
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}
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};
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let what = match id.as_str() {
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// https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html
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"ACPI0003" => "Power source",
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"ACPI0006" => "GPE block",
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"ACPI0007" => "Processor",
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"ACPI0010" => "Processor control",
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// https://uefi.org/sites/default/files/resources/devids%20%285%29.txt
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"PNP0000" => "AT interrupt controller",
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"PNP0100" => "AT timer",
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"PNP0103" => "HPET",
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"PNP0200" => "AT DMA controller",
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"PNP0303" => "IBM Enhanced (101/102-key, PS/2 mouse support)",
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"PNP030B" => "PS/2 keyboard",
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"PNP0400" => "Standard LPT printer port",
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"PNP0501" => "16550A-compatible COM port",
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"PNP0A03" | "PNP0A08" => "PCI bus",
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"PNP0A05" => "Generic ACPI bus",
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"PNP0A06" => "Generic ACPI Extended-IO bus (EIO bus)",
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"PNP0B00" => "AT real-time clock",
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"PNP0C01" => "System board",
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"PNP0C02" => "Reserved resources",
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"PNP0C04" => "Math coprocessor",
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"PNP0C09" => "Embedded controller",
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"PNP0C0A" => "Battery",
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"PNP0C0B" => "Fan",
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"PNP0C0C" => "Power button",
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"PNP0C0D" => "Lid sensor",
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"PNP0C0E" => "Sleep button",
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"PNP0C0F" => "PCI interrupt link",
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"PNP0C50" => "I2C HID",
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"PNP0F13" => "PS/2 port for PS/2-style mouse",
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_ => "?",
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};
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log::debug!("{}: {} ({})", name, id, what);
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}
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}
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}
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Ok(())
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}
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}
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