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
|
#include <Kernel/Devices/BXVGADevice.h>
#include <Kernel/IO.h>
#include <Kernel/PCI.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/Process.h>
#include <LibC/errno_numbers.h>
#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
#define BXVGA_DEV_IOCTL_SET_Y_OFFSET 1982
#define BXVGA_DEV_IOCTL_SET_RESOLUTION 1985
struct BXVGAResolution {
int width;
int height;
};
static BXVGADevice* s_the;
BXVGADevice& BXVGADevice::the()
{
return *s_the;
}
BXVGADevice::BXVGADevice()
: BlockDevice(82, 413)
{
s_the = this;
m_framebuffer_address = PhysicalAddress(find_framebuffer_address());
}
void BXVGADevice::set_register(word index, word 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_size = { width, height };
set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED);
set_register(VBE_DISPI_INDEX_XRES, (word)width);
set_register(VBE_DISPI_INDEX_YRES, (word)height);
set_register(VBE_DISPI_INDEX_VIRT_WIDTH, (word)width);
set_register(VBE_DISPI_INDEX_VIRT_HEIGHT, (word)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);
}
void BXVGADevice::set_y_offset(int offset)
{
ASSERT(offset <= m_framebuffer_size.height());
set_register(VBE_DISPI_INDEX_Y_OFFSET, (word)offset);
}
dword 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 };
dword 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, LinearAddress preferred_laddr, size_t offset, size_t size, int prot)
{
ASSERT(offset == 0);
ASSERT(size == framebuffer_size_in_bytes());
auto vmo = VMObject::create_for_physical_range(framebuffer_address(), framebuffer_size_in_bytes());
auto* region = process.allocate_region_with_vmo(
preferred_laddr,
framebuffer_size_in_bytes(),
move(vmo),
0,
"BXVGA Framebuffer",
prot
);
kprintf("BXVGA: %s(%u) created Region{%p} with size %u for framebuffer P%x with laddr L%x\n",
process.name().characters(), process.pid(),
region, region->size(), framebuffer_address().as_ptr(), region->laddr().get());
ASSERT(region);
return region;
}
int BXVGADevice::ioctl(FileDescriptor&, unsigned request, unsigned arg)
{
switch (request) {
case BXVGA_DEV_IOCTL_SET_Y_OFFSET:
if (arg > (unsigned)m_framebuffer_size.height() * 2)
return -EINVAL;
set_y_offset((int)arg);
return 0;
case BXVGA_DEV_IOCTL_SET_RESOLUTION: {
auto* resolution = (const BXVGAResolution*)arg;
if (!current->process().validate_read_typed(resolution))
return -EFAULT;
set_resolution(resolution->width, resolution->height);
return 0;
}
default:
return -EINVAL;
};
}
bool BXVGADevice::can_read(FileDescriptor&) const
{
ASSERT_NOT_REACHED();
}
bool BXVGADevice::can_write(FileDescriptor&) const
{
ASSERT_NOT_REACHED();
}
ssize_t BXVGADevice::read(FileDescriptor&, byte*, ssize_t)
{
ASSERT_NOT_REACHED();
}
ssize_t BXVGADevice::write(FileDescriptor&, const byte*, ssize_t)
{
ASSERT_NOT_REACHED();
}
|
