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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Devices/BXVGADevice.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/Process.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
#include <LibBareMetal/IO.h>
#include <LibC/errno_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
namespace Kernel {
#define MAX_RESOLUTION_WIDTH 4096
#define MAX_RESOLUTION_HEIGHT 2160
#define VBE_DISPI_IOPORT_INDEX 0x01CE
#define VBE_DISPI_IOPORT_DATA 0x01CF
#define VBE_DISPI_INDEX_ID 0x0
#define VBE_DISPI_INDEX_XRES 0x1
#define VBE_DISPI_INDEX_YRES 0x2
#define VBE_DISPI_INDEX_BPP 0x3
#define VBE_DISPI_INDEX_ENABLE 0x4
#define VBE_DISPI_INDEX_BANK 0x5
#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
#define VBE_DISPI_INDEX_X_OFFSET 0x8
#define VBE_DISPI_INDEX_Y_OFFSET 0x9
#define VBE_DISPI_DISABLED 0x00
#define VBE_DISPI_ENABLED 0x01
#define VBE_DISPI_LFB_ENABLED 0x40
static BXVGADevice* s_the;
BXVGADevice& BXVGADevice::the()
{
return *s_the;
}
BXVGADevice::BXVGADevice()
: BlockDevice(29, 0)
{
s_the = this;
m_framebuffer_address = PhysicalAddress(find_framebuffer_address());
}
void BXVGADevice::set_register(u16 index, u16 data)
{
IO::out16(VBE_DISPI_IOPORT_INDEX, index);
IO::out16(VBE_DISPI_IOPORT_DATA, data);
}
void BXVGADevice::set_resolution(int width, int height)
{
m_framebuffer_pitch = width * sizeof(u32);
m_framebuffer_width = width;
m_framebuffer_height = height;
set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED);
set_register(VBE_DISPI_INDEX_XRES, (u16)width);
set_register(VBE_DISPI_INDEX_YRES, (u16)height);
set_register(VBE_DISPI_INDEX_VIRT_WIDTH, (u16)width);
set_register(VBE_DISPI_INDEX_VIRT_HEIGHT, (u16)height * 2);
set_register(VBE_DISPI_INDEX_BPP, 32);
set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
set_register(VBE_DISPI_INDEX_BANK, 0);
dbg() << "BXVGADevice resolution set to " << m_framebuffer_width << "x" << m_framebuffer_height << " (pitch=" << m_framebuffer_pitch << ")";
}
void BXVGADevice::set_y_offset(int y_offset)
{
ASSERT(y_offset == 0 || y_offset == m_framebuffer_height);
m_y_offset = y_offset;
set_register(VBE_DISPI_INDEX_Y_OFFSET, (u16)y_offset);
}
u32 BXVGADevice::find_framebuffer_address()
{
// NOTE: The QEMU card has the same PCI ID as the Bochs one.
static const PCI::ID bochs_vga_id = { 0x1234, 0x1111 };
static const PCI::ID virtualbox_vga_id = { 0x80ee, 0xbeef };
u32 framebuffer_address = 0;
PCI::enumerate_all([&framebuffer_address](const PCI::Address& address, PCI::ID id) {
if (id == bochs_vga_id || id == virtualbox_vga_id) {
framebuffer_address = PCI::get_BAR0(address) & 0xfffffff0;
kprintf("BXVGA: framebuffer @ P%x\n", framebuffer_address);
}
});
return framebuffer_address;
}
KResultOr<Region*> BXVGADevice::mmap(Process& process, FileDescription&, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot)
{
REQUIRE_PROMISE(video);
ASSERT(offset == 0);
ASSERT(size == framebuffer_size_in_bytes());
auto vmobject = AnonymousVMObject::create_for_physical_range(m_framebuffer_address, framebuffer_size_in_bytes());
if (!vmobject)
return KResult(-ENOMEM);
auto* region = process.allocate_region_with_vmobject(
preferred_vaddr,
framebuffer_size_in_bytes(),
vmobject.release_nonnull(),
0,
"BXVGA Framebuffer",
prot);
dbg() << "BXVGADevice: mmap with size " << region->size() << " at " << region->vaddr();
ASSERT(region);
return region;
}
int BXVGADevice::ioctl(FileDescription&, unsigned request, unsigned arg)
{
REQUIRE_PROMISE(video);
switch (request) {
case FB_IOCTL_GET_SIZE_IN_BYTES: {
auto* out = (size_t*)arg;
if (!Process::current->validate_write_typed(out))
return -EFAULT;
*out = framebuffer_size_in_bytes();
return 0;
}
case FB_IOCTL_GET_BUFFER: {
auto* index = (int*)arg;
if (!Process::current->validate_write_typed(index))
return -EFAULT;
*index = m_y_offset == 0 ? 0 : 1;
return 0;
}
case FB_IOCTL_SET_BUFFER: {
if (arg != 0 && arg != 1)
return -EINVAL;
set_y_offset(arg == 0 ? 0 : m_framebuffer_height);
return 0;
}
case FB_IOCTL_GET_RESOLUTION: {
auto* resolution = (FBResolution*)arg;
if (!Process::current->validate_write_typed(resolution))
return -EFAULT;
resolution->pitch = m_framebuffer_pitch;
resolution->width = m_framebuffer_width;
resolution->height = m_framebuffer_height;
return 0;
}
case FB_IOCTL_SET_RESOLUTION: {
auto* resolution = (FBResolution*)arg;
if (!Process::current->validate_read_typed(resolution) || !Process::current->validate_write_typed(resolution))
return -EFAULT;
if (resolution->width > MAX_RESOLUTION_WIDTH || resolution->height > MAX_RESOLUTION_HEIGHT)
return -EINVAL;
set_resolution(resolution->width, resolution->height);
resolution->pitch = m_framebuffer_pitch;
resolution->width = m_framebuffer_width;
resolution->height = m_framebuffer_height;
return 0;
}
default:
return -EINVAL;
};
}
}
|
