4lDO2
bea6747643
Currently, there are some things that need to be set up by userspace that the kernel previously did. These include telling firmware when the I/O APIC is used, and most importantly, shutting down the system. The former is not particularly important, but for the latter I think that we could implement this using a "shutdown pipe". Essentially it will be a file that triggers an event shutting down, which would be used to notify to acpid that the kernel is requesting a shutdown.
55 lines
1.2 KiB
Rust
55 lines
1.2 KiB
Rust
use core::convert::TryFrom;
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use core::mem;
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use alloc::boxed::Box;
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use super::sdt::Sdt;
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use super::rxsdt::Rxsdt;
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#[derive(Debug)]
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pub struct Rsdt(&'static Sdt);
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impl Rsdt {
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pub fn new(sdt: &'static Sdt) -> Option<Rsdt> {
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if &sdt.signature == b"RSDT" {
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Some(Rsdt(sdt))
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} else {
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None
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}
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}
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pub fn as_slice(&self) -> &[u8] {
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let length = usize::try_from(self.0.length)
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.expect("expected 32-bit length to fit within usize");
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unsafe {
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core::slice::from_raw_parts(self.0 as *const _ as *const u8, length)
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}
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}
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}
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impl Rxsdt for Rsdt {
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fn iter(&self) -> Box<dyn Iterator<Item = usize>> {
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Box::new(RsdtIter {
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sdt: self.0,
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i: 0
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})
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}
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}
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pub struct RsdtIter {
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sdt: &'static Sdt,
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i: usize
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}
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impl Iterator for RsdtIter {
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type Item = usize;
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fn next(&mut self) -> Option<Self::Item> {
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if self.i < self.sdt.data_len()/mem::size_of::<u32>() {
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let item = unsafe { *(self.sdt.data_address() as *const u32).add(self.i) };
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self.i += 1;
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Some(item as usize)
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} else {
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None
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}
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}
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}
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