/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
 * All rights reserved.
 *
 * 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 unmodified, 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 THE AUTHOR ``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 THE AUTHOR 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.
 */

/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */
/* This file is dual-licensed; see usr/src/contrib/bhyve/LICENSE */

/*
 * Copyright 2020 Oxide Computer Company
 */

#include <sys/cdefs.h>

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/x86_archext.h>

#include <machine/specialreg.h>
#include <machine/vmm.h>

#include "vmcb.h"
#include "svm.h"

struct vmcb_segment *
vmcb_segptr(struct vmcb *vmcb, int type)
{
        struct vmcb_state *state = &vmcb->state;

        switch (type) {
        case VM_REG_GUEST_CS:
                return (&state->cs);
        case VM_REG_GUEST_DS:
                return (&state->ds);
        case VM_REG_GUEST_ES:
                return (&state->es);
        case VM_REG_GUEST_FS:
                return (&state->fs);
        case VM_REG_GUEST_GS:
                return (&state->gs);
        case VM_REG_GUEST_SS:
                return (&state->ss);
        case VM_REG_GUEST_GDTR:
                return (&state->gdt);
        case VM_REG_GUEST_IDTR:
                return (&state->idt);
        case VM_REG_GUEST_LDTR:
                return (&state->ldt);
        case VM_REG_GUEST_TR:
                return (&state->tr);
        default:
                panic("unexpected seg %d", type);
        }
}

uint64_t *
vmcb_regptr(struct vmcb *vmcb, int ident, uint32_t *dirtyp)
{
        struct vmcb_state *state;
        uint64_t *res = NULL;
        uint32_t dirty = VMCB_CACHE_NONE;

        state = &vmcb->state;

        switch (ident) {
        case VM_REG_GUEST_CR2:
                res = &state->cr2;
                dirty = VMCB_CACHE_CR2;
                break;

        case VM_REG_GUEST_CR3:
                res = &state->cr3;
                dirty = VMCB_CACHE_CR;
                break;

        case VM_REG_GUEST_CR4:
                res = &state->cr4;
                dirty = VMCB_CACHE_CR;
                break;

        case VM_REG_GUEST_DR6:
                res = &state->dr6;
                dirty = VMCB_CACHE_DR;
                break;

        case VM_REG_GUEST_DR7:
                res = &state->dr7;
                dirty = VMCB_CACHE_DR;
                break;

        case VM_REG_GUEST_EFER:
                res = &state->efer;
                dirty = VMCB_CACHE_CR;
                break;

        case VM_REG_GUEST_RAX:
                res = &state->rax;
                break;

        case VM_REG_GUEST_RFLAGS:
                res = &state->rflags;
                break;

        case VM_REG_GUEST_RIP:
                res = &state->rip;
                break;

        case VM_REG_GUEST_RSP:
                res = &state->rsp;
                break;

        default:
                panic("unexpected register %d", ident);
                break;
        }

        ASSERT(res != NULL);
        if (dirtyp != NULL) {
                *dirtyp |= dirty;
        }
        return (res);
}

uint64_t *
vmcb_msr_ptr(struct vmcb *vmcb, uint32_t msr, uint32_t *dirtyp)
{
        uint64_t *res = NULL;
        uint32_t dirty = 0;
        struct vmcb_state *state = &vmcb->state;

        switch (msr) {
        case MSR_EFER:
                res = &state->efer;
                dirty = VMCB_CACHE_CR;
                break;

        case MSR_GSBASE:
                res = &state->gs.base;
                dirty = VMCB_CACHE_SEG;
                break;
        case MSR_FSBASE:
                res = &state->fs.base;
                dirty = VMCB_CACHE_SEG;
                break;
        case MSR_KGSBASE:
                res = &state->kernelgsbase;
                break;

        case MSR_STAR:
                res = &state->star;
                break;
        case MSR_LSTAR:
                res = &state->lstar;
                break;
        case MSR_CSTAR:
                res = &state->cstar;
                break;
        case MSR_SF_MASK:
                res = &state->sfmask;
                break;

        case MSR_SYSENTER_CS_MSR:
                res = &state->sysenter_cs;
                break;
        case MSR_SYSENTER_ESP_MSR:
                res = &state->sysenter_esp;
                break;
        case MSR_SYSENTER_EIP_MSR:
                res = &state->sysenter_eip;
                break;

        case MSR_PAT:
                res = &state->g_pat;
                dirty = VMCB_CACHE_NP;
                break;

        case MSR_DEBUGCTL:
                res = &state->dbgctl;
                dirty = VMCB_CACHE_LBR;
                break;
        case MSR_LBR_FROM:
                res = &state->br_from;
                dirty = VMCB_CACHE_LBR;
                break;
        case MSR_LBR_TO:
                res = &state->br_to;
                dirty = VMCB_CACHE_LBR;
                break;
        case MSR_LEX_FROM:
                res = &state->int_from;
                dirty = VMCB_CACHE_LBR;
                break;
        case MSR_LEX_TO:
                res = &state->int_to;
                dirty = VMCB_CACHE_LBR;
                break;
        }

        if (res != NULL && dirtyp != NULL) {
                *dirtyp = dirty;
        }
        return (res);
}