1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* 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 "int4Bvds.h"
#include "utils.h"
#include "vboxdev.h"
/** Struct containing all the information required to send a VirtualBox message. */
typedef struct vboxcomm {
/** The IO port of the VirtualBox pci device, found by vbox_init_device(). */
uint16_t iobase;
/** Whether we are using VDS or not. */
bool vds;
/** The VDS (Virtual DMA service) descriptor corresponding to the buffer that we will use.
* Initialized by vbox_init_buffer(), even if we don't use VDS. */
VDSDDS dds;
/** We assume the actual buffer comes in memory after this struct. */
char buf[];
} 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 []
/** 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, unsigned size);
/** 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
|
