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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <Kernel/Devices/MBVGADevice.h>
28#include <Kernel/Process.h>
29#include <Kernel/VM/AnonymousVMObject.h>
30#include <Kernel/VM/MemoryManager.h>
31#include <LibC/errno_numbers.h>
32#include <LibC/sys/ioctl_numbers.h>
33
34namespace Kernel {
35
36static MBVGADevice* s_the;
37
38MBVGADevice& MBVGADevice::the()
39{
40 return *s_the;
41}
42
43MBVGADevice::MBVGADevice(PhysicalAddress addr, int pitch, int width, int height)
44 : BlockDevice(29, 0)
45 , m_framebuffer_address(addr)
46 , m_framebuffer_pitch(pitch)
47 , m_framebuffer_width(width)
48 , m_framebuffer_height(height)
49{
50 dbg() << "MBVGADevice address=" << addr << ", pitch=" << pitch << ", width=" << width << ", height=" << height;
51 s_the = this;
52}
53
54KResultOr<Region*> MBVGADevice::mmap(Process& process, FileDescription&, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot, bool shared)
55{
56 REQUIRE_PROMISE(video);
57 if (!shared)
58 return KResult(-ENODEV);
59 ASSERT(offset == 0);
60 ASSERT(size == framebuffer_size_in_bytes());
61 auto vmobject = AnonymousVMObject::create_for_physical_range(m_framebuffer_address, framebuffer_size_in_bytes());
62 if (!vmobject)
63 return KResult(-ENOMEM);
64 auto* region = process.allocate_region_with_vmobject(
65 preferred_vaddr,
66 framebuffer_size_in_bytes(),
67 vmobject.release_nonnull(),
68 0,
69 "MBVGA Framebuffer",
70 prot);
71 dbg() << "MBVGADevice: mmap with size " << region->size() << " at " << region->vaddr();
72 ASSERT(region);
73 return region;
74}
75
76int MBVGADevice::ioctl(FileDescription&, unsigned request, unsigned arg)
77{
78 REQUIRE_PROMISE(video);
79 switch (request) {
80 case FB_IOCTL_GET_SIZE_IN_BYTES: {
81 auto* out = (size_t*)arg;
82 if (!Process::current->validate_write_typed(out))
83 return -EFAULT;
84 *out = framebuffer_size_in_bytes();
85 return 0;
86 }
87 case FB_IOCTL_GET_BUFFER: {
88 auto* index = (int*)arg;
89 if (!Process::current->validate_write_typed(index))
90 return -EFAULT;
91 *index = 0;
92 return 0;
93 }
94 case FB_IOCTL_GET_RESOLUTION: {
95 auto* resolution = (FBResolution*)arg;
96 if (!Process::current->validate_write_typed(resolution))
97 return -EFAULT;
98 resolution->pitch = m_framebuffer_pitch;
99 resolution->width = m_framebuffer_width;
100 resolution->height = m_framebuffer_height;
101 return 0;
102 }
103 case FB_IOCTL_SET_RESOLUTION: {
104 auto* resolution = (FBResolution*)arg;
105 if (!Process::current->validate_read_typed(resolution) || !Process::current->validate_write_typed(resolution))
106 return -EFAULT;
107 resolution->pitch = m_framebuffer_pitch;
108 resolution->width = m_framebuffer_width;
109 resolution->height = m_framebuffer_height;
110 return 0;
111 }
112 default:
113 return -EINVAL;
114 };
115}
116
117}