41ed6db81e
* guix/cpu.scm (current-cpu): Set flags at the beginning of the loop. Read from '/proc/cpuinfo' until the end of the file. Add match options for discovering armhf/aarch64 cpu configurations.
217 lines
9.5 KiB
Scheme
217 lines
9.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2021 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2022 Efraim Flashner <efraim@flashner.co.il>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix cpu)
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#:use-module (guix sets)
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#:use-module (guix memoization)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:export (current-cpu
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cpu?
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cpu-architecture
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cpu-vendor
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cpu-family
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cpu-model
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cpu-flags
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cpu->gcc-architecture))
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;;; Commentary:
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;;;
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;;; This module provides tools to determine the micro-architecture supported
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;;; by the CPU and to map it to a name known to GCC's '-march'.
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;;;
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;;; Code:
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;; CPU description.
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(define-record-type <cpu>
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(cpu architecture vendor family model flags)
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cpu?
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(architecture cpu-architecture) ;string, from 'uname'
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(vendor cpu-vendor) ;string
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(family cpu-family) ;integer
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(model cpu-model) ;integer
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(flags cpu-flags)) ;set of strings
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(define current-cpu
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(mlambda ()
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"Return a <cpu> record representing the host CPU."
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(define (prefix? prefix)
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(lambda (str)
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(string-prefix? prefix str)))
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(call-with-input-file "/proc/cpuinfo"
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(lambda (port)
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(let loop ((vendor #f)
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(family #f)
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(model #f)
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(flags (set)))
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(match (read-line port)
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((? eof-object?)
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(cpu (utsname:machine (uname))
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vendor family model flags))
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;; vendor for x86_64 and i686
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((? (prefix? "vendor_id") str)
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(match (string-tokenize str)
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(("vendor_id" ":" vendor)
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(loop vendor family model flags))))
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;; vendor for aarch64 and armhf
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((? (prefix? "CPU implementer") str)
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(match (string-tokenize str)
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(("CPU" "implementer" ":" vendor)
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(loop vendor family model flags))))
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;; family for x86_64 and i686
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((? (prefix? "cpu family") str)
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(match (string-tokenize str)
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(("cpu" "family" ":" family)
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(loop vendor (string->number family) model flags))))
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;; model for x86_64 and i686
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((? (prefix? "model") str)
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(match (string-tokenize str)
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(("model" ":" model)
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(loop vendor family (string->number model) flags))
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(_
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(loop vendor family model flags))))
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;; model for aarch64 and armhf
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((? (prefix? "CPU part") str)
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(match (string-tokenize str)
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(("CPU" "part" ":" model)
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(loop vendor family (string->number (string-drop model 2) 16) flags))))
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;; flags for x86_64 and i686
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((? (prefix? "flags") str)
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(match (string-tokenize str)
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(("flags" ":" flags ...)
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(loop vendor family model (list->set flags)))))
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;; flags for aarch64 and armhf
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((? (prefix? "Features") str)
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(match (string-tokenize str)
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(("Features" ":" flags ...)
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(loop vendor family model (list->set flags)))))
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(_
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(loop vendor family model flags))))))))
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(define (cpu->gcc-architecture cpu)
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"Return the architecture name, suitable for GCC's '-march' flag, that
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corresponds to CPU, a record as returned by 'current-cpu'."
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(match (cpu-architecture cpu)
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("x86_64"
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;; Transcribed from GCC's 'host_detect_local_cpu' in driver-i386.c.
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(or (and (equal? "GenuineIntel" (cpu-vendor cpu))
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(= 6 (cpu-family cpu)) ;the "Pentium Pro" family
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(letrec-syntax ((if-flags (syntax-rules (=>)
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((_)
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#f)
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((_ (flags ... => name) rest ...)
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(if (every (lambda (flag)
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(set-contains? (cpu-flags cpu)
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flag))
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'(flags ...))
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name
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(if-flags rest ...))))))
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(if-flags ("avx" "avx512vp2intersect" "tsxldtrk" => "sapphirerapids")
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("avx" "avx512vp2intersect" => "tigerlake")
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("avx" "avx512bf16" => "cooperlake")
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("avx" "wbnoinvd" => "icelake-server")
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("avx" "avx512bitalg" => "icelake-client")
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("avx" "avx512vbmi" => "cannonlake")
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("avx" "avx5124vnniw" => "knm")
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("avx" "avx512er" => "knl")
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("avx" "avx512f" => "skylake-avx512")
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("avx" "serialize" => "alderlake")
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("avx" "clflushopt" => "skylake")
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("avx" "adx" => "broadwell")
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("avx" "avx2" => "haswell")
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("avx" => "sandybridge")
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("sse4_2" "gfni" => "tremont")
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("sse4_2" "sgx" => "goldmont-plus")
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("sse4_2" "xsave" => "goldmont")
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("sse4_2" "movbe" => "silvermont")
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("sse4_2" => "nehalem")
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("ssse3" "movbe" => "bonnell")
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("ssse3" => "core2")
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("longmode" => "x86-64"))))
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(and (equal? "AuthenticAMD" (cpu-vendor cpu))
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(letrec-syntax ((if-flags (syntax-rules (=>)
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((_)
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#f)
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((_ (flags ... => name) rest ...)
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(if (every (lambda (flag)
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(set-contains? (cpu-flags cpu)
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flag))
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'(flags ...))
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name
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(if-flags rest ...))))))
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(or (and (= 22 (cpu-family cpu))
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(if-flags ("movbe" => "btver2")))
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(and (= 6 (cpu-family cpu))
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(if-flags ("3dnowp" => "athalon")))
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(if-flags ("vaes" => "znver3")
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("clwb" => "znver2")
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("clzero" => "znver1")
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("avx2" => "bdver4")
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("xsaveopt" => "bdver3")
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("bmi" => "bdver2")
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("xop" => "bdver1")
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("sse4a" "has_ssse3" => "btver1")
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("sse4a" => "amdfam10")
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("sse2" "sse3" => "k8-sse3")
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("longmode" "sse3" => "k8-sse3")
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("sse2" => "k8")
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("longmode" => "k8")
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("mmx" "3dnow" => "k6-3")
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("mmx" => "k6")
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(_ => "pentium")))))
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;; Fallback case for non-Intel processors or for Intel processors not
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;; recognized above.
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(letrec-syntax ((if-flags (syntax-rules (=>)
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((_)
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#f)
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((_ (flags ... => name) rest ...)
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(if (every (lambda (flag)
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(set-contains? (cpu-flags cpu)
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flag))
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'(flags ...))
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name
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(if-flags rest ...))))))
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(if-flags ("avx512" => "knl")
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("adx" => "broadwell")
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("avx2" => "haswell")
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;; TODO: tigerlake, cooperlake, etc.
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("avx" => "sandybridge")
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("sse4_2" "gfni" => "tremont")
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("sse4_2" "sgx" => "goldmont-plus")
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("sse4_2" "xsave" => "goldmont")
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("sse4_2" "movbe" => "silvermont")
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("sse4_2" => "nehalem")
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("ssse3" "movbe" => "bonnell")
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("ssse3" => "core2")))
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;; TODO: Recognize CENTAUR/CYRIX/NSC?
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"x86_64"))
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(architecture
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;; TODO: AArch64.
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architecture)))
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