| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/ring/src/cpu.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cpu.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../ring/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../ring/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2016 Brian Smith. |
| // |
| // Permission to use, copy, modify, and/or distribute this software for any |
| // purpose with or without fee is hereby granted, provided that the above |
| // copyright notice and this permission notice appear in all copies. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES |
| // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
| // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| </span><span class="doccomment">/// A witness indicating that CPU features have been detected and cached. |
| /// |
| /// TODO: Eventually all feature detection logic should be done through |
| /// functions that accept a `Features` parameter, to guarantee that nothing |
| /// tries to read the cached values before they are written. |
| /// |
| /// This is a zero-sized type so that it can be "stored" wherever convenient. |
| </span><span class="attribute">#[derive(Copy, Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Features(()); |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>features() -> Features { |
| <span class="comment">// We don't do runtime feature detection on aarch64-apple-* as all AAarch64 |
| // features we use are available on every device since the first devices. |
| </span><span class="attribute">#[cfg(any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| all( |
| any(target_arch = <span class="string">"aarch64"</span>, target_arch = <span class="string">"arm"</span>), |
| any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"fuchsia"</span>, target_os = <span class="string">"linux"</span>) |
| ) |
| ))] |
| </span>{ |
| <span class="kw">static </span>INIT: spin::Once<()> = spin::Once::new(); |
| <span class="kw">let </span>() = INIT.call_once(|| { |
| <span class="attribute">#[cfg(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>))] |
| </span>{ |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_cpuid_setup(); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_cpuid_setup(); |
| } |
| } |
| |
| <span class="attribute">#[cfg(all( |
| any(target_arch = <span class="string">"aarch64"</span>, target_arch = <span class="string">"arm"</span>), |
| any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"fuchsia"</span>, target_os = <span class="string">"linux"</span>) |
| ))] |
| </span>{ |
| arm::setup(); |
| } |
| }); |
| } |
| |
| Features(()) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>arm { |
| <span class="attribute">#[cfg(all( |
| any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>), |
| any(target_arch = <span class="string">"aarch64"</span>, target_arch = <span class="string">"arm"</span>) |
| ))] |
| </span><span class="kw">pub fn </span>setup() { |
| <span class="kw">use </span>libc::c_ulong; |
| |
| <span class="comment">// XXX: The `libc` crate doesn't provide `libc::getauxval` consistently |
| // across all Android/Linux targets, e.g. musl. |
| </span><span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>getauxval(type_: c_ulong) -> c_ulong; |
| } |
| |
| <span class="kw">const </span>AT_HWCAP: c_ulong = <span class="number">16</span>; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"aarch64"</span>)] |
| </span><span class="kw">const </span>HWCAP_NEON: c_ulong = <span class="number">1 </span><< <span class="number">1</span>; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"arm"</span>)] |
| </span><span class="kw">const </span>HWCAP_NEON: c_ulong = <span class="number">1 </span><< <span class="number">12</span>; |
| |
| <span class="kw">let </span>caps = <span class="kw">unsafe </span>{ getauxval(AT_HWCAP) }; |
| |
| <span class="comment">// We assume NEON is available on AARCH64 because it is a required |
| // feature. |
| </span><span class="attribute">#[cfg(target_arch = <span class="string">"aarch64"</span>)] |
| </span><span class="macro">debug_assert!</span>(caps & HWCAP_NEON == HWCAP_NEON); |
| |
| <span class="comment">// OpenSSL and BoringSSL don't enable any other features if NEON isn't |
| // available. |
| </span><span class="kw">if </span>caps & HWCAP_NEON == HWCAP_NEON { |
| <span class="kw">let </span><span class="kw-2">mut </span>features = NEON.mask; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"aarch64"</span>)] |
| </span><span class="kw">const </span>OFFSET: c_ulong = <span class="number">3</span>; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"arm"</span>)] |
| </span><span class="kw">const </span>OFFSET: c_ulong = <span class="number">0</span>; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"arm"</span>)] |
| </span><span class="kw">let </span>caps = { |
| <span class="kw">const </span>AT_HWCAP2: c_ulong = <span class="number">26</span>; |
| <span class="kw">unsafe </span>{ getauxval(AT_HWCAP2) } |
| }; |
| |
| <span class="kw">const </span>HWCAP_AES: c_ulong = <span class="number">1 </span><< <span class="number">0 </span>+ OFFSET; |
| <span class="kw">const </span>HWCAP_PMULL: c_ulong = <span class="number">1 </span><< <span class="number">1 </span>+ OFFSET; |
| <span class="kw">const </span>HWCAP_SHA2: c_ulong = <span class="number">1 </span><< <span class="number">3 </span>+ OFFSET; |
| |
| <span class="kw">if </span>caps & HWCAP_AES == HWCAP_AES { |
| features |= AES.mask; |
| } |
| <span class="kw">if </span>caps & HWCAP_PMULL == HWCAP_PMULL { |
| features |= PMULL.mask; |
| } |
| <span class="kw">if </span>caps & HWCAP_SHA2 == HWCAP_SHA2 { |
| features |= SHA256.mask; |
| } |
| |
| <span class="kw">unsafe </span>{ GFp_armcap_P = features }; |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(target_os = <span class="string">"fuchsia"</span>, target_arch = <span class="string">"aarch64"</span>))] |
| </span><span class="kw">pub fn </span>setup() { |
| <span class="kw">type </span>zx_status_t = i32; |
| |
| <span class="attribute">#[link(name = <span class="string">"zircon"</span>)] |
| </span><span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>zx_system_get_features(kind: u32, features: <span class="kw-2">*mut </span>u32) -> zx_status_t; |
| } |
| |
| <span class="kw">const </span>ZX_OK: i32 = <span class="number">0</span>; |
| <span class="kw">const </span>ZX_FEATURE_KIND_CPU: u32 = <span class="number">0</span>; |
| <span class="kw">const </span>ZX_ARM64_FEATURE_ISA_ASIMD: u32 = <span class="number">1 </span><< <span class="number">2</span>; |
| <span class="kw">const </span>ZX_ARM64_FEATURE_ISA_AES: u32 = <span class="number">1 </span><< <span class="number">3</span>; |
| <span class="kw">const </span>ZX_ARM64_FEATURE_ISA_PMULL: u32 = <span class="number">1 </span><< <span class="number">4</span>; |
| <span class="kw">const </span>ZX_ARM64_FEATURE_ISA_SHA2: u32 = <span class="number">1 </span><< <span class="number">6</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>caps = <span class="number">0</span>; |
| <span class="kw">let </span>rc = <span class="kw">unsafe </span>{ zx_system_get_features(ZX_FEATURE_KIND_CPU, <span class="kw-2">&mut </span>caps) }; |
| |
| <span class="comment">// OpenSSL and BoringSSL don't enable any other features if NEON isn't |
| // available. |
| </span><span class="kw">if </span>rc == ZX_OK && (caps & ZX_ARM64_FEATURE_ISA_ASIMD == ZX_ARM64_FEATURE_ISA_ASIMD) { |
| <span class="kw">let </span><span class="kw-2">mut </span>features = NEON.mask; |
| |
| <span class="kw">if </span>caps & ZX_ARM64_FEATURE_ISA_AES == ZX_ARM64_FEATURE_ISA_AES { |
| features |= AES.mask; |
| } |
| <span class="kw">if </span>caps & ZX_ARM64_FEATURE_ISA_PMULL == ZX_ARM64_FEATURE_ISA_PMULL { |
| features |= PMULL.mask; |
| } |
| <span class="kw">if </span>caps & ZX_ARM64_FEATURE_ISA_SHA2 == ZX_ARM64_FEATURE_ISA_SHA2 { |
| features |= <span class="number">1 </span><< <span class="number">4</span>; |
| } |
| |
| <span class="kw">unsafe </span>{ GFp_armcap_P = features }; |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>features { |
| { |
| $( |
| <span class="macro-nonterminal">$name</span>:ident { |
| mask: <span class="macro-nonterminal">$mask</span>:expr, |
| |
| <span class="doccomment">/// Should we assume that the feature is always available |
| /// for aarch64-apple-* targets? The first AArch64 iOS |
| /// device used the Apple A7 chip. |
| </span><span class="comment">// TODO: When we can use `if` in const expressions: |
| // ``` |
| // aarch64_apple: $aarch64_apple, |
| // ``` |
| </span>aarch64_apple: <span class="bool-val">true</span>, |
| } |
| ),+ |
| , <span class="comment">// trailing comma is required. |
| </span>} => { |
| $( |
| <span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span><span class="macro-nonterminal">$name</span>: Feature = Feature { |
| mask: <span class="macro-nonterminal">$mask</span>, |
| }; |
| )+ |
| |
| <span class="comment">// TODO: When we can use `if` in const expressions, do this: |
| // ``` |
| // const ARMCAP_STATIC: u32 = 0 |
| // $( |
| // | ( if $aarch64_apple && |
| // cfg!(all(target_arch = "aarch64", |
| // target_vendor = "apple")) { |
| // $name.mask |
| // } else { |
| // 0 |
| // } |
| // ) |
| // )+; |
| // ``` |
| // |
| // TODO: Add static feature detection to other targets. |
| // TODO: Combine static feature detection with runtime feature |
| // detection. |
| </span><span class="attribute">#[cfg(all(target_arch = <span class="string">"aarch64"</span>, target_vendor = <span class="string">"apple"</span>))] |
| </span><span class="kw">const </span>ARMCAP_STATIC: u32 = <span class="number">0 |
| </span>$( | <span class="macro-nonterminal">$name</span>.mask |
| )+; |
| <span class="attribute">#[cfg(not(all(target_arch = <span class="string">"aarch64"</span>, target_vendor = <span class="string">"apple"</span>)))] |
| </span><span class="kw">const </span>ARMCAP_STATIC: u32 = <span class="number">0</span>; |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"aarch64"</span>, target_vendor = <span class="string">"apple"</span>))] |
| #[test] |
| </span><span class="kw">fn </span>test_armcap_static_available() { |
| <span class="kw">let </span>features = <span class="kw">crate</span>::cpu::features(); |
| $( |
| <span class="macro">assert!</span>(<span class="macro-nonterminal">$name</span>.available(features)); |
| )+ |
| } |
| } |
| } |
| |
| <span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Feature { |
| mask: u32, |
| } |
| |
| <span class="kw">impl </span>Feature { |
| <span class="attribute">#[allow(dead_code)] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>available(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw">super</span>::Features) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.mask == <span class="self">self</span>.mask & ARMCAP_STATIC { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| |
| <span class="attribute">#[cfg(all( |
| any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"fuchsia"</span>, target_os = <span class="string">"linux"</span>), |
| any(target_arch = <span class="string">"arm"</span>, target_arch = <span class="string">"aarch64"</span>) |
| ))] |
| </span>{ |
| <span class="kw">if </span><span class="self">self</span>.mask == <span class="self">self</span>.mask & <span class="kw">unsafe </span>{ GFp_armcap_P } { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| } |
| |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="macro">features! </span>{ |
| <span class="comment">// Keep in sync with `ARMV7_NEON`. |
| </span>NEON { |
| mask: <span class="number">1 </span><< <span class="number">0</span>, |
| aarch64_apple: <span class="bool-val">true</span>, |
| }, |
| |
| <span class="comment">// Keep in sync with `ARMV8_AES`. |
| </span>AES { |
| mask: <span class="number">1 </span><< <span class="number">2</span>, |
| aarch64_apple: <span class="bool-val">true</span>, |
| }, |
| |
| <span class="comment">// Keep in sync with `ARMV8_SHA256`. |
| </span>SHA256 { |
| mask: <span class="number">1 </span><< <span class="number">4</span>, |
| aarch64_apple: <span class="bool-val">true</span>, |
| }, |
| |
| <span class="comment">// Keep in sync with `ARMV8_PMULL`. |
| </span>PMULL { |
| mask: <span class="number">1 </span><< <span class="number">5</span>, |
| aarch64_apple: <span class="bool-val">true</span>, |
| }, |
| } |
| |
| <span class="comment">// Some non-Rust code still checks this even when it is statically known |
| // the given feature is available, so we have to ensure that this is |
| // initialized properly. Keep this in sync with the initialization in |
| // BoringSSL's crypto.c. |
| // |
| // TODO: This should have "hidden" visibility but we don't have a way of |
| // controlling that yet: https://github.com/rust-lang/rust/issues/73958. |
| </span><span class="attribute">#[cfg(any(target_arch = <span class="string">"arm"</span>, target_arch = <span class="string">"aarch64"</span>))] |
| #[no_mangle] |
| </span><span class="kw">static </span><span class="kw-2">mut </span>GFp_armcap_P: u32 = ARMCAP_STATIC; |
| |
| <span class="attribute">#[cfg(all( |
| any(target_arch = <span class="string">"arm"</span>, target_arch = <span class="string">"aarch64"</span>), |
| target_vendor = <span class="string">"apple" |
| </span>))] |
| #[test] |
| </span><span class="kw">fn </span>test_armcap_static_matches_armcap_dynamic() { |
| <span class="macro">assert_eq!</span>(ARMCAP_STATIC, <span class="number">1 </span>| <span class="number">4 </span>| <span class="number">16 </span>| <span class="number">32</span>); |
| <span class="macro">assert_eq!</span>(ARMCAP_STATIC, <span class="kw">unsafe </span>{ GFp_armcap_P }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr( |
| not(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>)), |
| allow(dead_code) |
| )] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>intel { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Feature { |
| word: usize, |
| mask: u32, |
| } |
| |
| <span class="kw">impl </span>Feature { |
| <span class="attribute">#[allow(clippy::needless_return)] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>available(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw">super</span>::Features) -> bool { |
| <span class="attribute">#[cfg(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>))] |
| </span>{ |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">static </span><span class="kw-2">mut </span>GFp_ia32cap_P: [u32; <span class="number">4</span>]; |
| } |
| <span class="kw">return </span><span class="self">self</span>.mask == <span class="self">self</span>.mask & <span class="kw">unsafe </span>{ GFp_ia32cap_P[<span class="self">self</span>.word] }; |
| } |
| |
| <span class="attribute">#[cfg(not(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>)))] |
| </span>{ |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>FXSR: Feature = Feature { |
| word: <span class="number">0</span>, |
| mask: <span class="number">1 </span><< <span class="number">24</span>, |
| }; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>PCLMULQDQ: Feature = Feature { |
| word: <span class="number">1</span>, |
| mask: <span class="number">1 </span><< <span class="number">1</span>, |
| }; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>SSSE3: Feature = Feature { |
| word: <span class="number">1</span>, |
| mask: <span class="number">1 </span><< <span class="number">9</span>, |
| }; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>SSE41: Feature = Feature { |
| word: <span class="number">1</span>, |
| mask: <span class="number">1 </span><< <span class="number">19</span>, |
| }; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>MOVBE: Feature = Feature { |
| word: <span class="number">1</span>, |
| mask: <span class="number">1 </span><< <span class="number">22</span>, |
| }; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>AES: Feature = Feature { |
| word: <span class="number">1</span>, |
| mask: <span class="number">1 </span><< <span class="number">25</span>, |
| }; |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>AVX: Feature = Feature { |
| word: <span class="number">1</span>, |
| mask: <span class="number">1 </span><< <span class="number">28</span>, |
| }; |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, test))] |
| </span><span class="kw">mod </span>x86_64_tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_avx_movbe_mask() { |
| <span class="comment">// This is the OpenSSL style of testing these bits. |
| </span><span class="macro">assert_eq!</span>((AVX.mask | MOVBE.mask) >> <span class="number">22</span>, <span class="number">0x41</span>); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="ring" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
