/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2015 Mihai Carabas <mihai.carabas@gmail.com>
 * Copyright (c) 2024 Ruslan Bukin <br@bsdpad.com>
 *
 * This software was developed by the University of Cambridge Computer
 * Laboratory (Department of Computer Science and Technology) under Innovate
 * UK project 105694, "Digital Security by Design (DSbD) Technology Platform
 * Prototype".
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _VMM_RISCV_H_
#define _VMM_RISCV_H_

#include <machine/reg.h>
#include <machine/pcpu.h>
#include <machine/vmm.h>

#include <riscv/vmm/vmm_vtimer.h>

struct hypregs {
	uint64_t hyp_ra;
	uint64_t hyp_sp;
	uint64_t hyp_gp;
	uint64_t hyp_tp;
	uint64_t hyp_t[7];
	uint64_t hyp_s[12];
	uint64_t hyp_a[8];
	uint64_t hyp_sepc;
	uint64_t hyp_sstatus;
	uint64_t hyp_hstatus;
};

struct hypcsr {
	uint64_t hvip;
	uint64_t vsstatus;
	uint64_t vsie;
	uint64_t vstvec;
	uint64_t vsscratch;
	uint64_t vsepc;
	uint64_t vscause;
	uint64_t vstval;
	uint64_t vsatp;
	uint64_t scounteren;
	uint64_t senvcfg;
};

enum vmm_fence_type {
	VMM_RISCV_FENCE_INVALID = 0,
	VMM_RISCV_FENCE_I,
	VMM_RISCV_FENCE_VMA,
	VMM_RISCV_FENCE_VMA_ASID,
};

struct vmm_fence {
	enum vmm_fence_type type;
	size_t start;
	size_t size;
	uint64_t asid;
};

struct hypctx {
	struct hypregs host_regs;
	struct hypregs guest_regs;
	struct hypcsr guest_csrs;
	uint64_t host_sscratch;
	uint64_t host_stvec;
	uint64_t host_scounteren;
	uint64_t guest_scounteren;
	struct hyp *hyp;
	struct vcpu *vcpu;
	bool has_exception;
	int cpu_id;
	int ipi_pending;
	int interrupts_pending;
	struct vtimer vtimer;

	struct vmm_fence *fence_queue;
	struct mtx fence_queue_mtx;
	int fence_queue_head;
	int fence_queue_tail;
#define	FENCE_REQ_I	(1 << 0)
#define	FENCE_REQ_VMA	(1 << 1)
	int fence_req;
};

struct hyp {
	struct vm	*vm;
	uint64_t	vmid_generation;
	bool		aplic_attached;
	struct aplic	*aplic;
	struct hypctx	*ctx[];
};

struct hyptrap {
	uint64_t sepc;
	uint64_t scause;
	uint64_t stval;
	uint64_t htval;
	uint64_t htinst;
};

#define	dprintf(fmt, ...)

struct hypctx *riscv_get_active_vcpu(void);
void vmm_switch(struct hypctx *);
void vmm_unpriv_trap(struct hyptrap *, uint64_t tmp);
bool vmm_sbi_ecall(struct vcpu *);

void riscv_send_ipi(struct hyp *hyp, cpuset_t *cpus);
int riscv_check_ipi(struct hypctx *hypctx, bool clear);
bool riscv_check_interrupts_pending(struct hypctx *hypctx);

#endif /* !_VMM_RISCV_H_ */