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/*
* 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.
*/
#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "hf/arch/cpu.h"
#include "hf/addr.h"
#include "hf/spinlock.h"
#include "vmapi/hf/types.h"
/** The number of bits in each element of the interrupt bitfields. */
#define INTERRUPT_REGISTER_BITS 32
enum vcpu_state {
/** The vcpu is switched off. */
VCPU_STATE_OFF,
/** The vcpu is ready to be run. */
VCPU_STATE_READY,
/** The vcpu is currently running. */
VCPU_STATE_RUNNING,
/** The vcpu is waiting for a message. */
VCPU_STATE_BLOCKED_MAILBOX,
/** The vcpu is waiting for an interrupt. */
VCPU_STATE_BLOCKED_INTERRUPT,
/** The vcpu has aborted. */
VCPU_STATE_ABORTED,
};
struct interrupts {
/** Bitfield keeping track of which interrupts are enabled. */
uint32_t interrupt_enabled[HF_NUM_INTIDS / INTERRUPT_REGISTER_BITS];
/** Bitfield keeping track of which interrupts are pending. */
uint32_t interrupt_pending[HF_NUM_INTIDS / INTERRUPT_REGISTER_BITS];
/**
* The number of interrupts which are currently both enabled and
* pending. i.e. the number of bits set in interrupt_enable &
* interrupt_pending.
*/
uint32_t enabled_and_pending_count;
};
struct vcpu_fault_info {
ipaddr_t ipaddr;
vaddr_t vaddr;
vaddr_t pc;
int mode;
};
struct vcpu {
struct spinlock lock;
/*
* The state is only changed in the context of the vCPU being run. This
* ensures the scheduler can easily keep track of the vCPU state as
* transitions are indicated by the return code from the run call.
*/
enum vcpu_state state;
struct cpu *cpu;
struct vm *vm;
struct arch_regs regs;
struct interrupts interrupts;
/*
* Determine whether the 'regs' field is available for use. This is set
* to false when a vCPU is about to run on a physical CPU, and is set
* back to true when it is descheduled.
*/
bool regs_available;
};
/** Encapsulates a vCPU whose lock is held. */
struct vcpu_locked {
struct vcpu *vcpu;
};
/* TODO: Update alignment such that cpus are in different cache lines. */
struct cpu {
/** CPU identifier. Doesn't have to be contiguous. */
cpu_id_t id;
/** Pointer to bottom of the stack. */
void *stack_bottom;
/** See api.c for the partial ordering on locks. */
struct spinlock lock;
/** Determines whether or not the cpu is currently on. */
bool is_on;
};
void cpu_module_init(const cpu_id_t *cpu_ids, size_t count);
size_t cpu_index(struct cpu *c);
bool cpu_on(struct cpu *c, ipaddr_t entry, uintreg_t arg);
void cpu_off(struct cpu *c);
struct cpu *cpu_find(cpu_id_t id);
struct vcpu_locked vcpu_lock(struct vcpu *vcpu);
void vcpu_unlock(struct vcpu_locked *locked);
void vcpu_init(struct vcpu *vcpu, struct vm *vm);
void vcpu_on(struct vcpu_locked vcpu, ipaddr_t entry, uintreg_t arg);
spci_vcpu_index_t vcpu_index(const struct vcpu *vcpu);
bool vcpu_is_off(struct vcpu_locked vcpu);
bool vcpu_secondary_reset_and_start(struct vcpu *vcpu, ipaddr_t entry,
uintreg_t arg);
bool vcpu_handle_page_fault(const struct vcpu *current,
struct vcpu_fault_info *f);