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60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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#include "Hal.h"
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#include "HalTypes.h"
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include "mozilla/BitSet.h"
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namespace mozilla::hal_impl {
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mozilla::Maybe<hal::HeterogeneousCpuInfo> CreateHeterogeneousCpuInfo() {
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#ifdef __aarch64__
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// As of now on Apple Silicon the number of *.logicalcpu_max is the same as
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// *.physicalcpu_max.
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size_t len = sizeof(uint32_t);
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uint32_t pCores = 0;
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if (sysctlbyname("hw.perflevel0.logicalcpu_max", &pCores, &len, nullptr, 0)) {
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return Nothing();
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}
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len = sizeof(uint32_t);
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uint32_t eCores = 0;
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if (sysctlbyname("hw.perflevel1.logicalcpu_max", &eCores, &len, nullptr, 0)) {
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return Nothing();
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}
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hal::HeterogeneousCpuInfo info;
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info.mTotalNumCpus = pCores + eCores;
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// The API has currently a limit how many cpu cores it can tell about.
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for (uint32_t i = 0; i < hal::HeterogeneousCpuInfo::MAX_CPUS; ++i) {
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if (pCores) {
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--pCores;
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info.mBigCpus[i] = true;
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} else if (eCores) {
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--eCores;
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info.mLittleCpus[i] = true;
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} else {
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break;
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}
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}
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return Some(info);
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#else
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return Nothing();
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#endif
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}
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const Maybe<hal::HeterogeneousCpuInfo>& GetHeterogeneousCpuInfo() {
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static const Maybe<hal::HeterogeneousCpuInfo> cpuInfo =
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CreateHeterogeneousCpuInfo();
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return cpuInfo;
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}
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} // namespace mozilla::hal_impl
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