acpica-sys

Builds acpica, and has bindings to it. To actually use most of it, various symbols will need to be provided, described in section 9 of the ACPICA reference manual.

This is a fork of the existing acpica-sys crate with minor modifications:

• Use GCC
• Modified build
• More recent acpica sources

Check https://crates.io/crates/libacpica for more details.

Updating ACPICA sources

Some steps that might be useful to follow:

• Download new sources from https://acpica.org/downloads
• Rename acpica to acpica-old
• Unpack new acpica sources, rename folder to acpica
• cp acpica-old/source/include/platform/acnrk.h acpica/source/include/platform/acnrk.h
• Include the acnrk header file inside acenv.h in the platform list:

Should look like this:

```C

if defined(NRK)

include "acnrk.h"

elif defined(_LINUX) || defined(linux)

include "aclinux.h"

```

• mv src/raw64.rs src/raw64.bak.rs
• bash update-bindings.sh (Make sure rust-bindgen is installed for this step)
• Inspect raw64.rs see if it approximately represents src/raw64.bak.rs file.
• Switch whatever project uses this to new version of the crate and see if it compiles
• rm src/raw64.bak.rs
• rm -rf acpica-old

Some issues that can be expected and what to do about them:

• Compilation error due to _valist_tag, AcpiOsVprintf etc. -> Just remove those definitons.
• Compilation error error[E0433]: failed to resolve: maybe a missing crate std? -> Replace with core, or remove those definiton if unwanted.
• error[E0308]: mismatched types expected i32, found u32: Make sure UINT8, UINT32, UINT64 map to u8, u32, u64 respectively (and not i8, i32, i64).
• Linker throws multiple definition of a symbol errors:

log | = note: ld: ./target/x86_64-nrk/debug/deps/liblibacpica-e827d49529440c52.rlib(utglobal.o):(.data+0x0): multiple definition of `AcpiGbl_FixedEventInfo'; ./target/x86_64-nrk/debug/deps/liblibacpica-70ca8cf5bc7406ee.rlib(utglobal.o):(.data+0x0): first defined here

Some older version of libacpica creeped in through a transitive dependency (e.g., rust-topology). Clone rust-topology locally and use update libacpica there or use a cargo patch section to override.

• Linker error looking for libc functions?

log | = note: ld: ./target/x86_64-nrk/debug/deps/liblibacpica-1986a2fed1aa7eb7.rlib(utdebug.o): in function `AcpiDebugPrint': | utdebug.c:(.text+0x169): undefined reference to `strlen'

Check compile time defines for ACPI_USE_STANDARD_HEADERS and ACPI_USE_SYSTEM_CLIBRARY.