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December 2021: add changes for acpi #82

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December 2021: add changes for acpi #82

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13 changes: 13 additions & 0 deletions content/this-month/2021-12/index.md
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Expand Up @@ -6,6 +6,7 @@ date = 0000-01-01
month = "December 2021"
authors = [
"phil-opp",
"IsaacWoods",
# add yourself here
]
+++
Expand Down Expand Up @@ -36,6 +37,18 @@ The `x86_64` crate provides various abstractions for `x86_64` systems, including

In December, …

### [`acpi`](https://github.com/rust-osdev/acpi)

The `acpi` repository contains crates for parsing the ACPI tables – data structures that the firmware of modern computers use to relay information about the hardware to the OS.

December was a fairly quiet month, but [an important bug-fix landed](https://github.com/rust-osdev/acpi/pull/114) that corrected the way we handled `_CRS` objects in a structure
called the `_PRT`, which are found on PCI root bridges and tell the OS how interrupt pins on PCI devices have been routed to the platform's interrupt controller. Each pin can be
hardwired to a specific interrupt, or more commonly, can be dynamically assigned using a 'Link Object' through a set of control methods: `_PRS`, `_CRS`, `_SRS`, and `_DIS`.
However, many platforms implement Link Objects that actually hardcode the interrupts (including QEMU) and this is where the bug slipped in: `_CRS` was being evaluated as a
hardcoded object. We now treat these objects correctly as control methods, supporting properly-configured tables. <span class="gray">(published as `aml v0.16.1`)</span>

Thanks to [@Dentosal](https://github.com/Dentosal) for this contribution!

## Call for Participation

Want to contribute to a Rust OSDev project, but don't know where to start? Pick up one of these outstanding
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