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
|
/** @file
* VirtualBox Additions Linux kernel video driver hgsmi interface code
*/
/*
* Contributed by Hans de Goede <hdegoede@redhat.com>
*
* Copyright (C) 2017-2023 Oracle and/or its affiliates.
*
* 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.
*/
#include <HGSMIBase.h>
#include <VBoxVideoVBE.h>
/* One-at-a-Time Hash from http://www.burtleburtle.net/bob/hash/doobs.html */
static u32 hgsmi_hash_process(u32 hash, const u8 *data, int size)
{
while (size--) {
hash += *data++;
hash += (hash << 10);
hash ^= (hash >> 6);
}
return hash;
}
static u32 hgsmi_hash_end(u32 hash)
{
hash += (hash << 3);
hash ^= (hash >> 11);
hash += (hash << 15);
return hash;
}
/* Not really a checksum but that is the naming used in all vbox code */
static u32 hgsmi_checksum(u32 offset,
const HGSMIBUFFERHEADER *header,
const HGSMIBUFFERTAIL *tail)
{
u32 checksum;
checksum = hgsmi_hash_process(0, (u8 *)&offset, sizeof(offset));
checksum = hgsmi_hash_process(checksum, (u8 *)header, sizeof(*header));
/* 4 -> Do not checksum the checksum itself */
checksum = hgsmi_hash_process(checksum, (u8 *)tail, 4);
return hgsmi_hash_end(checksum);
}
#if RTLNX_VER_MAX(3,13,0)
void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
{
unsigned long vaddr = gen_pool_alloc(pool, size);
if (vaddr)
*dma = gen_pool_virt_to_phys(pool, vaddr);
return (void *)vaddr;
}
#endif
void *hgsmi_buffer_alloc(struct gen_pool *guest_pool, size_t size,
u8 channel, u16 channel_info)
{
HGSMIBUFFERHEADER *h;
HGSMIBUFFERTAIL *t;
size_t total_size;
dma_addr_t offset;
total_size = size + sizeof(*h) + sizeof(*t);
h = gen_pool_dma_alloc(guest_pool, total_size, &offset);
if (!h)
return NULL;
t = (HGSMIBUFFERTAIL *)((u8 *)h + sizeof(*h) + size);
h->u8Flags = HGSMI_BUFFER_HEADER_F_SEQ_SINGLE;
h->u32DataSize = size;
h->u8Channel = channel;
h->u16ChannelInfo = channel_info;
memset(&h->u.au8Union, 0, sizeof(h->u.au8Union));
t->u32Reserved = 0;
t->u32Checksum = hgsmi_checksum(offset, h, t);
return (u8 *)h + sizeof(*h);
}
void hgsmi_buffer_free(struct gen_pool *guest_pool, void *buf)
{
HGSMIBUFFERHEADER *h =
(HGSMIBUFFERHEADER *)((u8 *)buf - sizeof(*h));
size_t total_size = h->u32DataSize + sizeof(*h) +
sizeof(HGSMIBUFFERTAIL);
gen_pool_free(guest_pool, (unsigned long)h, total_size);
}
int hgsmi_buffer_submit(struct gen_pool *guest_pool, void *buf)
{
phys_addr_t offset;
offset = gen_pool_virt_to_phys(guest_pool, (unsigned long)buf -
sizeof(HGSMIBUFFERHEADER));
outl(offset, VGA_PORT_HGSMI_GUEST);
/* Make the compiler aware that the host has changed memory. */
mb();
return 0;
}
|
