135 lines
4.8 KiB
C
135 lines
4.8 KiB
C
/*
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* x86 CPU topology data structures and functions
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*
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* Copyright (c) 2012 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef TARGET_I386_TOPOLOGY_H
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#define TARGET_I386_TOPOLOGY_H
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/* This file implements the APIC-ID-based CPU topology enumeration logic,
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* documented at the following document:
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* Intel® 64 Architecture Processor Topology Enumeration
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* http://software.intel.com/en-us/articles/intel-64-architecture-processor-topology-enumeration/
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*
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* This code should be compatible with AMD's "Extended Method" described at:
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* AMD CPUID Specification (Publication #25481)
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* Section 3: Multiple Core Calcuation
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* as long as:
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* nr_threads is set to 1;
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* OFFSET_IDX is assumed to be 0;
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* CPUID Fn8000_0008_ECX[ApicIdCoreIdSize[3:0]] is set to apicid_core_width().
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*/
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#include <stdint.h>
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#include <string.h>
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#include "qemu/bitops.h"
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/* APIC IDs can be 32-bit, but beware: APIC IDs > 255 require x2APIC support
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*/
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typedef uint32_t apic_id_t;
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/* Return the bit width needed for 'count' IDs
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*/
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static unsigned apicid_bitwidth_for_count(unsigned count)
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{
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g_assert(count >= 1);
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count -= 1;
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return count ? 32 - clz32(count) : 0;
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}
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/* Bit width of the SMT_ID (thread ID) field on the APIC ID
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*/
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static inline unsigned apicid_smt_width(unsigned nr_cores, unsigned nr_threads)
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{
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return apicid_bitwidth_for_count(nr_threads);
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}
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/* Bit width of the Core_ID field
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*/
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static inline unsigned apicid_core_width(unsigned nr_cores, unsigned nr_threads)
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{
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return apicid_bitwidth_for_count(nr_cores);
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}
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/* Bit offset of the Core_ID field
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*/
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static inline unsigned apicid_core_offset(unsigned nr_cores,
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unsigned nr_threads)
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{
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return apicid_smt_width(nr_cores, nr_threads);
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}
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/* Bit offset of the Pkg_ID (socket ID) field
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*/
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static inline unsigned apicid_pkg_offset(unsigned nr_cores, unsigned nr_threads)
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{
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return apicid_core_offset(nr_cores, nr_threads) +
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apicid_core_width(nr_cores, nr_threads);
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}
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/* Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID
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*
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* The caller must make sure core_id < nr_cores and smt_id < nr_threads.
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*/
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static inline apic_id_t apicid_from_topo_ids(unsigned nr_cores,
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unsigned nr_threads,
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unsigned pkg_id,
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unsigned core_id,
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unsigned smt_id)
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{
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return (pkg_id << apicid_pkg_offset(nr_cores, nr_threads)) |
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(core_id << apicid_core_offset(nr_cores, nr_threads)) |
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smt_id;
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}
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/* Calculate thread/core/package IDs for a specific topology,
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* based on (contiguous) CPU index
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*/
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static inline void x86_topo_ids_from_idx(unsigned nr_cores,
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unsigned nr_threads,
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unsigned cpu_index,
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unsigned *pkg_id,
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unsigned *core_id,
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unsigned *smt_id)
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{
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unsigned core_index = cpu_index / nr_threads;
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*smt_id = cpu_index % nr_threads;
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*core_id = core_index % nr_cores;
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*pkg_id = core_index / nr_cores;
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}
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/* Make APIC ID for the CPU 'cpu_index'
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*
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* 'cpu_index' is a sequential, contiguous ID for the CPU.
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*/
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static inline apic_id_t x86_apicid_from_cpu_idx(unsigned nr_cores,
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unsigned nr_threads,
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unsigned cpu_index)
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{
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unsigned pkg_id, core_id, smt_id;
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x86_topo_ids_from_idx(nr_cores, nr_threads, cpu_index,
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&pkg_id, &core_id, &smt_id);
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return apicid_from_topo_ids(nr_cores, nr_threads, pkg_id, core_id, smt_id);
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}
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#endif /* TARGET_I386_TOPOLOGY_H */
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