/* $Id: VBoxGuest-haiku.c $ */
/** @file
 * VBoxGuest kernel module, Haiku Guest Additions, implementation.
 */

/*
 * Copyright (C) 2012-2019 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 */

/*
 * This code is based on:
 *
 * VirtualBox Guest Additions for Haiku.
 * Copyright (c) 2011 Mike Smith <mike@scgtrp.net>
 *                    François Revol <revol@free.fr>
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#define IN_VBOXGUEST
#include <sys/param.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <OS.h>
#include <Drivers.h>
#include <KernelExport.h>
#include <PCI.h>

#include "VBoxGuest-haiku.h"
#include "VBoxGuestInternal.h"
#include <VBox/log.h>
#include <iprt/assert.h>
#include <iprt/initterm.h>
#include <iprt/process.h>
#include <iprt/mem.h>
#include <iprt/memobj.h>
#include <iprt/asm.h>
#include <iprt/timer.h>
#include <iprt/heap.h>


/*********************************************************************************************************************************
*   Defined Constants And Macros                                                                                                 *
*********************************************************************************************************************************/
#define MODULE_NAME VBOXGUEST_MODULE_NAME


/*********************************************************************************************************************************
*   Internal Functions                                                                                                           *
*********************************************************************************************************************************/
/*
 * IRQ related functions.
 */
static void  vgdrvHaikuRemoveIRQ(void *pvState);
static int   vgdrvHaikuAddIRQ(void *pvState);
static int32 vgdrvHaikuISR(void *pvState);


/*********************************************************************************************************************************
*   Global Variables                                                                                                             *
*********************************************************************************************************************************/
static status_t std_ops(int32 op, ...);

static RTSPINLOCK g_Spinlock = NIL_RTSPINLOCK;

int32    api_version = B_CUR_DRIVER_API_VERSION;

/** List of cloned device. Managed by the kernel. */
//static struct clonedevs    *g_pvgdrvHaikuClones;
/** The dev_clone event handler tag. */
//static eventhandler_tag     g_vgdrvHaikuEHTag;
/** selinfo structure used for polling. */
//static struct selinfo       g_SelInfo;
/** PCI Bus Manager Module */
static pci_module_info *gPCI;

static struct vboxguest_module_info g_VBoxGuest =
{
    {
        MODULE_NAME,
        0,
        std_ops
    },
    { 0 },
    { 0 },
    0,
    RTLogBackdoorPrintf,
    RTLogBackdoorPrintfV,
    RTLogSetDefaultInstanceThread,
    RTMemAllocExTag,
    RTMemContAlloc,
    RTMemContFree,
    RTMemFreeEx,
    RTMpIsCpuPossible,
    RTMpNotificationDeregister,
    RTMpNotificationRegister,
    RTMpOnAll,
    RTMpOnOthers,
    RTMpOnSpecific,
    RTPowerNotificationDeregister,
    RTPowerNotificationRegister,
    RTPowerSignalEvent,
    RTR0AssertPanicSystem,
    RTR0Init,
    RTR0MemObjAddress,
    RTR0MemObjAddressR3,
    RTR0MemObjAllocContTag,
    RTR0MemObjAllocLowTag,
    RTR0MemObjAllocPageTag,
    RTR0MemObjAllocPhysExTag,
    RTR0MemObjAllocPhysNCTag,
    RTR0MemObjAllocPhysTag,
    RTR0MemObjEnterPhysTag,
    RTR0MemObjFree,
    RTR0MemObjGetPagePhysAddr,
    RTR0MemObjIsMapping,
    RTR0MemObjLockKernelTag,
    RTR0MemObjLockUserTag,
    RTR0MemObjMapKernelExTag,
    RTR0MemObjMapKernelTag,
    RTR0MemObjMapUserTag,
    RTR0MemObjProtect,
    RTR0MemObjReserveKernelTag,
    RTR0MemObjReserveUserTag,
    RTR0MemObjSize,
    RTR0ProcHandleSelf,
    RTR0Term,
    RTR0TermForced,
    RTProcSelf,
    RTSemEventGetResolution,
    RTSemEventMultiGetResolution,
    RTSemEventMultiWaitEx,
    RTSemEventMultiWaitExDebug,
    RTSemEventWaitEx,
    RTSemEventWaitExDebug,
    RTThreadIsInInterrupt,
    RTThreadPreemptDisable,
    RTThreadPreemptIsEnabled,
    RTThreadPreemptIsPending,
    RTThreadPreemptIsPendingTrusty,
    RTThreadPreemptIsPossible,
    RTThreadPreemptRestore,
    RTTimerGetSystemGranularity,
    RTTimerReleaseSystemGranularity,
    RTTimerRequestSystemGranularity,
    RTSpinlockAcquire,
    RTSpinlockRelease,
    RTMemTmpAllocTag,
    RTMemTmpFree,
    RTLogDefaultInstance,
    RTLogDefaultInstanceEx,
    RTLogRelGetDefaultInstance,
    RTLogRelGetDefaultInstanceEx,
    RTErrConvertToErrno,
    VGDrvCommonIoCtl,
    VGDrvCommonCreateUserSession,
    VGDrvCommonCloseSession,
    VBoxGuestIDCOpen,
    VBoxGuestIDCClose,
    VBoxGuestIDCCall,
    RTAssertMsg1Weak,
    RTAssertMsg2Weak,
    RTAssertMsg2WeakV,
    RTAssertShouldPanic,
    RTSemFastMutexCreate,
    RTSemFastMutexDestroy,
    RTSemFastMutexRelease,
    RTSemFastMutexRequest,
    RTSemMutexCreate,
    RTSemMutexDestroy,
    RTSemMutexRelease,
    RTSemMutexRequest,
    RTHeapSimpleRelocate,
    RTHeapOffsetInit,
    RTHeapSimpleInit,
    RTHeapOffsetAlloc,
    RTHeapSimpleAlloc,
    RTHeapOffsetFree,
    RTHeapSimpleFree
};

#if 0
/**
 * DEVFS event handler.
 */
static void vgdrvHaikuClone(void *pvArg, struct ucred *pCred, char *pszName, int cchName, struct cdev **ppDev)
{
    int iUnit;
    int rc;

    Log(("vgdrvHaikuClone: pszName=%s ppDev=%p\n", pszName, ppDev));

    /*
     * One device node per user, si_drv1 points to the session.
     * /dev/vboxguest<N> where N = {0...255}.
     */
    if (!ppDev)
    return;
    if (strcmp(pszName, "vboxguest") == 0)
    iUnit =  -1;
    else if (dev_stdclone(pszName, NULL, "vboxguest", &iUnit) != 1)
    return;
    if (iUnit >= 256)
    {
        Log(("vgdrvHaikuClone: iUnit=%d >= 256 - rejected\n", iUnit));
        return;
    }

    Log(("vgdrvHaikuClone: pszName=%s iUnit=%d\n", pszName, iUnit));

    rc = clone_create(&g_pvgdrvHaikuClones, &g_vgdrvHaikuDeviceHooks, &iUnit, ppDev, 0);
    Log(("vgdrvHaikuClone: clone_create -> %d; iUnit=%d\n", rc, iUnit));
    if (rc)
    {
        *ppDev = make_dev(&g_vgdrvHaikuDeviceHooks,
                          iUnit,
                          UID_ROOT,
                          GID_WHEEL,
                          0644,
                          "vboxguest%d", iUnit);
        if (*ppDev)
        {
            dev_ref(*ppDev);
            (*ppDev)->si_flags |= SI_CHEAPCLONE;
            Log(("vgdrvHaikuClone: Created *ppDev=%p iUnit=%d si_drv1=%p si_drv2=%p\n",
                 *ppDev, iUnit, (*ppDev)->si_drv1, (*ppDev)->si_drv2));
            (*ppDev)->si_drv1 = (*ppDev)->si_drv2 = NULL;
        }
        else
        Log(("vgdrvHaikuClone: make_dev iUnit=%d failed\n", iUnit));
    }
    else
    Log(("vgdrvHaikuClone: Existing *ppDev=%p iUnit=%d si_drv1=%p si_drv2=%p\n",
         *ppDev, iUnit, (*ppDev)->si_drv1, (*ppDev)->si_drv2));
}
#endif


static status_t vgdrvHaikuDetach(void)
{
    struct VBoxGuestDeviceState *pState = &sState;

    if (cUsers > 0)
        return EBUSY;

    /*
     * Reverse what we did in vgdrvHaikuAttach.
     */
    vgdrvHaikuRemoveIRQ(pState);

    if (pState->iVMMDevMemAreaId)
        delete_area(pState->iVMMDevMemAreaId);

    VGDrvCommonDeleteDevExt(&g_DevExt);

#ifdef DO_LOG
    RTLogDestroy(RTLogRelSetDefaultInstance(NULL));
    RTLogSetDefaultInstance(NULL);
//    RTLogDestroy(RTLogSetDefaultInstance(NULL));
#endif

    RTSpinlockDestroy(g_Spinlock);
    g_Spinlock = NIL_RTSPINLOCK;

    RTR0Term();
    return B_OK;
}


/**
 * Interrupt service routine.
 *
 * @returns Whether the interrupt was from VMMDev.
 * @param   pvState Opaque pointer to the device state.
 */
static int32 vgdrvHaikuISR(void *pvState)
{
    LogFlow((MODULE_NAME ":vgdrvHaikuISR pvState=%p\n", pvState));

    bool fOurIRQ = VGDrvCommonISR(&g_DevExt);
    if (fOurIRQ)
        return B_HANDLED_INTERRUPT;
    return B_UNHANDLED_INTERRUPT;
}


void VGDrvNativeISRMousePollEvent(PVBOXGUESTDEVEXT pDevExt)
{
    LogFlow(("VGDrvNativeISRMousePollEvent:\n"));

    status_t err = B_OK;
    //dprintf(MODULE_NAME ": isr mouse\n");

    /*
     * Wake up poll waiters.
     */
    //selwakeup(&g_SelInfo);
    //XXX:notify_select_event();
    RTSpinlockAcquire(g_Spinlock);

    if (sState.selectSync)
    {
        //dprintf(MODULE_NAME ": isr mouse: notify\n");
        notify_select_event(sState.selectSync, sState.selectEvent);
        sState.selectEvent = (uint8_t)0;
        sState.selectRef = (uint32_t)0;
        sState.selectSync = NULL;
    }
    else
        err = B_ERROR;

    RTSpinlockRelease(g_Spinlock);
}


bool VGDrvNativeProcessOption(PVBOXGUESTDEVEXT pDevExt, const char *pszName, const char *pszValue)
{
    RT_NOREF(pDevExt); RT_NOREF(pszName); RT_NOREF(pszValue);
    return false;
}


/**
 * Sets IRQ for VMMDev.
 *
 * @returns Haiku error code.
 * @param   pvState  Pointer to the state info structure.
 */
static int vgdrvHaikuAddIRQ(void *pvState)
{
    status_t err;
    struct VBoxGuestDeviceState *pState = (struct VBoxGuestDeviceState *)pvState;

    AssertReturn(pState, VERR_INVALID_PARAMETER);

    err = install_io_interrupt_handler(pState->iIrqResId, vgdrvHaikuISR, pState,  0);
    if (err == B_OK)
        return VINF_SUCCESS;
    return VERR_DEV_IO_ERROR;
}


/**
 * Removes IRQ for VMMDev.
 *
 * @param   pvState  Opaque pointer to the state info structure.
 */
static void vgdrvHaikuRemoveIRQ(void *pvState)
{
    struct VBoxGuestDeviceState *pState = (struct VBoxGuestDeviceState *)pvState;
    AssertPtr(pState);

    remove_io_interrupt_handler(pState->iIrqResId, vgdrvHaikuISR, pState);
}


static status_t vgdrvHaikuAttach(const pci_info *pDevice)
{
    status_t status;
    int rc;
    int iResId;
    struct VBoxGuestDeviceState *pState = &sState;
    static const char *const     s_apszGroups[] = VBOX_LOGGROUP_NAMES;
    PRTLOGGER                    pRelLogger;

    AssertReturn(pDevice, B_BAD_VALUE);

    cUsers = 0;

    /*
     * Initialize IPRT R0 driver, which internally calls OS-specific r0 init.
     */
    rc = RTR0Init(0);
    if (RT_FAILURE(rc))
    {
        dprintf(MODULE_NAME ": RTR0Init failed: %d\n", rc);
        return ENXIO;
    }

    rc = RTSpinlockCreate(&g_Spinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "vgdrvHaiku");
    if (RT_FAILURE(rc))
    {
        LogRel(("vgdrvHaikuAttach: RTSpinlock create failed. rc=%Rrc\n", rc));
        return ENXIO;
    }

#ifdef DO_LOG
    /*
     * Create the release log.
     * (We do that here instead of common code because we want to log
     * early failures using the LogRel macro.)
     */
    rc = RTLogCreate(&pRelLogger, 0 | RTLOGFLAGS_PREFIX_THREAD /* fFlags */, "all",
                     "VBOX_RELEASE_LOG", RT_ELEMENTS(s_apszGroups), s_apszGroups,
                     RTLOGDEST_STDOUT | RTLOGDEST_DEBUGGER | RTLOGDEST_USER, NULL);
    dprintf(MODULE_NAME ": RTLogCreate: %d\n", rc);
    if (RT_SUCCESS(rc))
    {
        //RTLogGroupSettings(pRelLogger, g_szLogGrp);
        //RTLogFlags(pRelLogger, g_szLogFlags);
        //RTLogDestinations(pRelLogger, "/var/log/vboxguest.log");
        RTLogRelSetDefaultInstance(pRelLogger);
        RTLogSetDefaultInstance(pRelLogger); //XXX
    }
#endif

    /*
     * Allocate I/O port resource.
     */
    pState->uIOPortBase = pDevice->u.h0.base_registers[0];
    /** @todo check flags for IO? */
    if (pState->uIOPortBase)
    {
        /*
         * Map the MMIO region.
         */
        uint32 phys = pDevice->u.h0.base_registers[1];
        /** @todo Check flags for mem? */
        pState->VMMDevMemSize    = pDevice->u.h0.base_register_sizes[1];
        pState->iVMMDevMemAreaId = map_physical_memory("VirtualBox Guest MMIO", phys, pState->VMMDevMemSize,
                                                       B_ANY_KERNEL_BLOCK_ADDRESS, B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA,
                                                       &pState->pMMIOBase);
        if (pState->iVMMDevMemAreaId > 0 && pState->pMMIOBase)
        {
            /*
             * Call the common device extension initializer.
             */
            rc = VGDrvCommonInitDevExt(&g_DevExt, pState->uIOPortBase, pState->pMMIOBase, pState->VMMDevMemSize,
#if ARCH_BITS == 64
                                       VBOXOSTYPE_Haiku_x64,
#else
                                       VBOXOSTYPE_Haiku,
#endif
                                       VMMDEV_EVENT_MOUSE_POSITION_CHANGED);
            if (RT_SUCCESS(rc))
            {
                /*
                 * Add IRQ of VMMDev.
                 */
                pState->iIrqResId = pDevice->u.h0.interrupt_line;
                rc = vgdrvHaikuAddIRQ(pState);
                if (RT_SUCCESS(rc))
                {
                    /*
                     * Read host configuration.
                     */
                    VGDrvCommonProcessOptionsFromHost(&g_DevExt);

                    LogRel((MODULE_NAME ": loaded successfully\n"));
                    return B_OK;
                }

                LogRel((MODULE_NAME ": VGDrvCommonInitDevExt failed.\n"));
                VGDrvCommonDeleteDevExt(&g_DevExt);
            }
            else
                LogRel((MODULE_NAME ": vgdrvHaikuAddIRQ failed.\n"));
        }
        else
            LogRel((MODULE_NAME ": MMIO region setup failed.\n"));
    }
    else
        LogRel((MODULE_NAME ": IOport setup failed.\n"));

    RTR0Term();
    return ENXIO;
}


static status_t vgdrvHaikuProbe(pci_info *pDevice)
{
    if (   pDevice->vendor_id == VMMDEV_VENDORID
        && pDevice->device_id == VMMDEV_DEVICEID)
        return B_OK;

    return ENXIO;
}


status_t init_module(void)
{
    status_t err = B_ENTRY_NOT_FOUND;
    pci_info info;
    int ix = 0;

    err = get_module(B_PCI_MODULE_NAME, (module_info **)&gPCI);
    if (err != B_OK)
        return err;

    while ((*gPCI->get_nth_pci_info)(ix++, &info) == B_OK)
    {
        if (vgdrvHaikuProbe(&info) == 0)
        {
            /* We found it */
            err = vgdrvHaikuAttach(&info);
            return err;
        }
    }

    return B_ENTRY_NOT_FOUND;
}


void uninit_module(void)
{
    vgdrvHaikuDetach();
    put_module(B_PCI_MODULE_NAME);
}


static status_t std_ops(int32 op, ...)
{
    switch (op)
    {
        case B_MODULE_INIT:
            return init_module();

        case B_MODULE_UNINIT:
        {
            uninit_module();
            return B_OK;
        }

        default:
            return B_ERROR;
    }
}


_EXPORT module_info *modules[] =
{
    (module_info *)&g_VBoxGuest,
    NULL
};

/* Common code that depend on g_DevExt. */
#include "VBoxGuestIDC-unix.c.h"