inc/cpu.h

#ifndef _CPU_H
#define _CPU_H

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#include "arch_cpu.h"
#include "spinlock.h"

struct vcpu {
	struct spinlock lock;
	bool is_on;
	struct arch_regs regs;
	struct vm *vm;
};

/* TODO: Update alignment such that cpus are in different cache lines. */
struct cpu {
	struct spinlock lock;

	struct vcpu *current;

	/*
	 * Enabling/disabling irqs are counted per-cpu. They are enabled when
	 * the count is zero, and disabled when it's non-zero.
	 */
	uint32_t irq_disable_count;

	/* Determines whether or not the cpu is currently on. */
	bool is_on;

	/* CPU identifier. Doesn't have to be contiguous. */
	size_t id;

	/* Pointer to bottom of the stack. */
	void *stack_bottom;
};

void cpu_init(struct cpu *c);
void cpu_irq_enable(struct cpu *c);
void cpu_irq_disable(struct cpu *c);
bool cpu_on(struct cpu *c);
void cpu_off(struct cpu *c);

void vcpu_init(struct vcpu *vcpu, struct vm *vm);
void vcpu_on(struct vcpu *v);
void vcpu_off(struct vcpu *v);

#endif  /* _CPU_H */