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dcac527068
When using a legacy BIOS, the memory regions used by the BIOS are well defined. This is not the case when using a UEFI BIOS. So include the stack area in the BSS so the loader knows how much memory to allocate, and check we have space to relocate the program to either low or high memory. There are still some assumptions in the USB driver code that need to be fixed.
74 lines
1.5 KiB
C
74 lines
1.5 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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* Provides support for multi-threaded operation.
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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 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 search step that located the ACPI RSDP (for debug).
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*/
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extern const char *rsdp_source;
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/*
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* The address of the ACPI RSDP (for debug).
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*/
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extern uintptr_t rsdp_addr;
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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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* 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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* 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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