/*
 * Copyright 2018 The Hafnium Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "hf/cpu.h"
#include "hf/vm.h"

/**
 * The entry point of CPUs when they are turned on. It is supposed to initialise
 * all state and return the first vCPU to run.
 */
struct vcpu *cpu_main(struct cpu *c)
{
	struct vcpu *vcpu;
	struct vm *vm;

	vcpu = vm_get_vcpu(vm_find(HF_PRIMARY_VM_ID), cpu_index(c));
	vm = vcpu->vm;
	vcpu->cpu = c;

	/* Reset the registers to give a clean start for the primary's vCPU. */
	arch_regs_reset(&vcpu->regs, true, vm->id, c->id, vm->ptable.root);

	return vcpu;
}