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std_detect: Update platform support docs (#1380)

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Taiki Endo 2023-02-12 01:10:11 +09:00 • committed by GitHub
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library/stdarch/crates/std_detect/README.md
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@ -46,17 +46,25 @@ crate from working on applications in which `std` is not available.
the operating system. `std_detect` assumes that the binary is an user-space
application. If you need raw support for querying `cpuid`, consider using the
[`cupid`](https://crates.io/crates/cupid) crate.
* Linux:
* `arm{32, 64}`, `mips{32,64}{,el}`, `powerpc{32,64}{,le}`: `std_detect`
* Linux/Android:
* `arm{32, 64}`, `mips{32,64}{,el}`, `powerpc{32,64}{,le}`, `riscv{32,64}`: `std_detect`
supports these on Linux by querying ELF auxiliary vectors (using `getauxval`
when available), and if that fails, by querying `/proc/cpuinfo`.
when available), and if that fails, by querying `/proc/cpuinfo`.
* `arm64`: partial support for doing run-time feature detection by directly
querying `mrs` is implemented for Linux >= 4.11, but not enabled by default.
* FreeBSD:
* `arm32`, `powerpc64`: `std_detect` supports these on FreeBSD by querying ELF
auxiliary vectors using `sysctl`.
* `arm64`: run-time feature detection is implemented by directly querying `mrs`.
* OpenBSD:
* `arm64`: run-time feature detection is implemented by querying `sysctl`.
* Windows:
* `arm64`: run-time feature detection is implemented by querying `IsProcessorFeaturePresent`.
# License
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