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117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef _SMP_H_
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#define _SMP_H_
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/**
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* \file
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*
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* Provides support for multi-threaded operation.
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*
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*//*
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* Copyright (C) 2020-2022 Martin Whitaker.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "boot.h"
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#include "barrier.h"
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#include "spinlock.h"
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/**
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* The maximum number of CPU cores that can be used.
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*/
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#define MAX_CPUS (1 + MAX_APS)
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/**
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* The maximum number of APIC IDs.
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*/
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#define MAX_APIC_IDS 256
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/**
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* The maximum number of NUMA proximity domains.
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*/
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#define MAX_PROXIMITY_DOMAINS MAX_APIC_IDS
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/**
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* The current state of a CPU core.
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*/
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typedef enum __attribute__ ((packed)) {
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CPU_STATE_DISABLED = 0,
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CPU_STATE_ENABLED = 1,
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CPU_STATE_RUNNING = 2
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} cpu_state_t;
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/**
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* The number of available CPU cores. Initially this is 1, but may increase
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* after calling smp_init().
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*/
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extern int num_available_cpus;
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/**
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* The number of distinct memory proximity domains. Initially this is 1, but
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* may increase after calling smp_init().
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*/
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extern int num_proximity_domains;
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/**
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* Initialises the SMP state and detects the number of available CPU cores.
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*/
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void smp_init(bool smp_enable);
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/**
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* Starts the APs listed as enabled in cpu_state. Returns 0 on success
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* or the index number of the lowest-numbered AP that failed to start.
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*/
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int smp_start(cpu_state_t cpu_state[MAX_CPUS]);
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/**
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* Sends a non-maskable interrupt to the CPU core whose ordinal number
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* is cpu_num.
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*/
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void smp_send_nmi(int cpu_num);
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/**
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* Returns the ordinal number of the calling CPU core.
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*/
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int smp_my_cpu_num(void);
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/**
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* Return the index of the proximity domain corresponding to the current CPU number.
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* 1 in NUMA-unaware mode, >= 1 otherwise.
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*/
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uint32_t smp_get_proximity_domain_idx(int cpu_num);
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/**
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* "Allocates" a CPU ID in the given proximity domain, for filling in NUMA-aware chunk index.
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* Returns the nth CPU ID found so far in the proximity domain.
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*/
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static inline uint8_t smp_alloc_cpu_in_proximity_domain(uint32_t proximity_domain_idx)
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{
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extern uint8_t used_cpus_in_proximity_domain[MAX_PROXIMITY_DOMAINS];
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uint8_t chunk_index = used_cpus_in_proximity_domain[proximity_domain_idx];
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used_cpus_in_proximity_domain[proximity_domain_idx]++;
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return chunk_index;
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}
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/**
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* Computes the first span, limited to a single proximity domain, of the given memory range.
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*/
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int smp_narrow_to_proximity_domain(uintptr_t start, uintptr_t end, uint32_t * proximity_domain_idx, uintptr_t * new_start, uintptr_t * new_end);
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//int count_cpus_for_proximity_domain_corresponding_to_range(uintptr_t start, uintptr_t end, uint32_t proximity_domain_idx);
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//void get_memory_affinity_entry(int idx, uint32_t * proximity_domain_idx, uint64_t * start, uint64_t * end);
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/**
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* Allocates and initialises a barrier object in pinned memory.
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*/
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barrier_t *smp_alloc_barrier(int num_threads);
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/**
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* Allocates and initialises a spinlock object in pinned memory.
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*/
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spinlock_t *smp_alloc_mutex();
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#endif /* _SMP_H_ */
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