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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
#pragma off (unreferenced)
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "dlog.h"
#include "vds.h"
#include "utils.h"
#include "vboxdev.h"
/** Size of the VBox buffer. The maximum message length that may be sent. */
// Enough to fit a set_pointer_shape message with a 16x16 cursor
#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 * PVBOXCOMM;
typedef vboxcomm_t __far * LPVBOXCOMM;
typedef int32_t vboxerr;
/** 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);
static void vbox_init_req(VMMDevRequestHeader __far *hdr, VMMDevRequestType type, unsigned size)
{
_fmemset(hdr, 0, size);
hdr->size = size;
hdr->version = VMMDEV_REQUEST_HEADER_VERSION;
hdr->requestType = type;
hdr->rc = VERR_DEV_IO_ERROR; // So that we trigger an error if VirtualBox doesn't actually reply anything
}
/** Lets VirtualBox know that there are VirtualBox Guest Additions on this guest.
* @param osType os installed on this guest. */
static vboxerr vbox_report_guest_info(LPVBOXCOMM vb, uint32_t osType)
{
VMMDevReportGuestInfo __far *req = (void __far *) vb->buf;
vbox_init_req(&req->header, VMMDevReq_ReportGuestInfo, sizeof(VMMDevReportGuestInfo));
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 vboxerr vbox_set_mouse(LPVBOXCOMM vb, bool absolute, bool pointer)
{
VMMDevReqMouseStatus __far *req = (void __far *) vb->buf;
vbox_init_req(&req->header, VMMDevReq_SetMouseStatus, sizeof(VMMDevReqMouseStatus));
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 vboxerr vbox_get_mouse(LPVBOXCOMM vb, bool __far *abs,
uint16_t __far *xpos, uint16_t __far *ypos)
{
VMMDevReqMouseStatus __far *req = (void __far *) vb->buf;
vbox_init_req(&req->header, VMMDevReq_GetMouseStatus, sizeof(VMMDevReqMouseStatus));
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 vboxerr vbox_set_pointer_visible(LPVBOXCOMM vb, bool visible)
{
VMMDevReqMousePointer __far *req = (void __far *) vb->buf;
vbox_init_req(&req->header, VMMDevReq_SetPointerShape, sizeof(VMMDevReqMousePointer));
if (visible) req->fFlags |= VBOX_MOUSE_POINTER_VISIBLE;
vbox_send_request(vb->iobase, vb->dds.physicalAddress);
return req->header.rc;
}
/** Computes size of a VMMDevReqMousePointer message. */
static inline unsigned vbox_req_mouse_pointer_size(unsigned width, unsigned height)
{
const unsigned and_mask_size = (width + 7) / 8 * height;
const unsigned xor_mask_size = width * height * 4;
const unsigned data_size = and_mask_size + xor_mask_size;
return MAX(sizeof(VMMDevReqMousePointer), 24 + 20 + data_size);
}
static vboxerr vbox_idle(LPVBOXCOMM vb)
{
VMMDevReqIdle __far *req = (void __far *) vb->buf;
vbox_init_req(&req->header, VMMDevReq_Idle, sizeof(VMMDevReqIdle));
vbox_send_request(vb->iobase, vb->dds.physicalAddress);
return req->header.rc;
}
#pragma pop (unreferenced)
#endif
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