mirror of
https://github.com/Atmosphere-NX/Atmosphere
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67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mesosphere.hpp>
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namespace ams::kern::svc {
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/* ============================= Common ============================= */
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namespace {
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int32_t GetCurrentProcessorNumber() {
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/* Setup variables to track affinity information. */
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s32 current_phys_core;
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u64 v_affinity_mask = 0;
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/* Forever try to get the affinity. */
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while (true) {
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/* Update affinity information if we've run out. */
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while (v_affinity_mask == 0) {
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current_phys_core = GetCurrentCoreId();
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v_affinity_mask = GetCurrentThread().GetVirtualAffinityMask();
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if ((v_affinity_mask & (1ul << current_phys_core)) != 0) {
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return current_phys_core;
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}
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}
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/* Check the next virtual bit. */
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do {
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const s32 next_virt_core = static_cast<s32>(__builtin_ctzll(v_affinity_mask));
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if (current_phys_core == cpu::VirtualToPhysicalCoreMap[next_virt_core]) {
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return next_virt_core;
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}
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v_affinity_mask &= ~(1ul << next_virt_core);
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} while (v_affinity_mask != 0);
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}
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}
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}
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/* ============================= 64 ABI ============================= */
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int32_t GetCurrentProcessorNumber64() {
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return GetCurrentProcessorNumber();
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}
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/* ============================= 64From32 ABI ============================= */
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int32_t GetCurrentProcessorNumber64From32() {
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return GetCurrentProcessorNumber();
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}
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}
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