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/*
* VBMouse - VirtualBox communication routines
* Copyright (C) 2022 Javier S. Pedro
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef VBOX_H
#define VBOX_H
#include <stdbool.h>
#include <stdint.h>
#include "dlog.h"
#include "vds.h"
#include "utils.h"
#include "vboxdev.h"
//#define VBOX_BUFFER_SIZE 64
#define VBOX_BUFFER_SIZE (1024 + 32 + 24 + 20)
typedef struct vboxcomm {
uint16_t iobase;
char buf[VBOX_BUFFER_SIZE];
VDSDDS dds;
} vboxcomm_t;
typedef vboxcomm_t __far * LPVBOXCOMM;
/** Actually send a request to the VirtualBox VMM device.
* @param addr 32-bit physical address containing the VMMDevRequest struct.
*/
static void vbox_send_request(uint16_t iobase, uint32_t addr);
#pragma aux vbox_send_request = \
"push eax" /* Preserve 32-bit register, specifically the higher word. */ \
"push bx" /* Combine bx:ax into single 32-bit eax */ \
"push ax" \
"pop eax" \
"out dx, eax" \
"pop eax" \
__parm [dx] [bx ax] \
__modify [dx]
/** Finds the VirtualBox PCI device and reads the current IO base.
* @returns 0 if the device was found. */
extern int vbox_init_device(LPVBOXCOMM vb);
/** Prepares the buffer used for communicating with VBox and
* computes its physical address (using VDS if necessary). */
extern int vbox_init_buffer(LPVBOXCOMM vb);
/** Releases/unlocks buffer, no further use possible. */
extern int vbox_release_buffer(LPVBOXCOMM vb);
/** Lets VirtualBox know that there are VirtualBox Guest Additions on this guest.
* @param osType os installed on this guest. */
static int vbox_report_guest_info(LPVBOXCOMM vb, uint32_t osType)
{
VMMDevReportGuestInfo __far *req = (void __far *) vb->buf;
bzero(req, sizeof(VMMDevReportGuestInfo));
req->header.size = sizeof(VMMDevReportGuestInfo);
req->header.version = VMMDEV_REQUEST_HEADER_VERSION;
req->header.requestType = VMMDevReq_ReportGuestInfo;
req->header.rc = -1;
req->guestInfo.interfaceVersion = VMMDEV_VERSION;
req->guestInfo.osType = osType;
vbox_send_request(vb->iobase, vb->dds.physicalAddress);
return req->header.rc;
}
/** Tells VirtualBox whether we want absolute mouse information or not. */
static int vbox_set_mouse(LPVBOXCOMM vb, bool absolute, bool pointer)
{
VMMDevReqMouseStatus __far *req = (void __far *) vb->buf;
bzero(req, sizeof(VMMDevReqMouseStatus));
req->header.size = sizeof(VMMDevReqMouseStatus);
req->header.version = VMMDEV_REQUEST_HEADER_VERSION;
req->header.requestType = VMMDevReq_SetMouseStatus;
req->header.rc = -1;
if (absolute) req->mouseFeatures |= VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE;
if (pointer) req->mouseFeatures |= VMMDEV_MOUSE_GUEST_NEEDS_HOST_CURSOR;
vbox_send_request(vb->iobase, vb->dds.physicalAddress);
return req->header.rc;
}
/** Gets the current absolute mouse position from VirtualBox.
* @param abs false if user has disabled mouse integration in VirtualBox,
* in which case we should fallback to PS/2 relative events. */
static int vbox_get_mouse(LPVBOXCOMM vb, bool __far *abs,
uint16_t __far *xpos, uint16_t __far *ypos)
{
VMMDevReqMouseStatus __far *req = (void __far *) vb->buf;
bzero(req, sizeof(VMMDevReqMouseStatus));
req->header.size = sizeof(VMMDevReqMouseStatus);
req->header.version = VMMDEV_REQUEST_HEADER_VERSION;
req->header.requestType = VMMDevReq_GetMouseStatus;
req->header.rc = -1;
vbox_send_request(vb->iobase, vb->dds.physicalAddress);
*abs = req->mouseFeatures & VMMDEV_MOUSE_HOST_WANTS_ABSOLUTE;
*xpos = req->pointerXPos;
*ypos = req->pointerYPos;
return req->header.rc;
}
/** Asks the host to render the mouse cursor for us. */
static int vbox_set_pointer_visible(LPVBOXCOMM vb, bool visible)
{
VMMDevReqMousePointer __far *req = (void __far *) vb->buf;
bzero(req, sizeof(VMMDevReqMousePointer));
req->header.size = sizeof(VMMDevReqMousePointer);
req->header.version = VMMDEV_REQUEST_HEADER_VERSION;
req->header.requestType = VMMDevReq_SetPointerShape;
req->header.rc = -1;
if (visible) req->fFlags |= VBOX_MOUSE_POINTER_VISIBLE;
vbox_send_request(vb->iobase, vb->dds.physicalAddress);
return req->header.rc;
}
#endif
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