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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)
55{
56 REQUIRE_PROMISE(video);
57 ASSERT(offset == 0);
58 ASSERT(size == framebuffer_size_in_bytes());
59 auto vmobject = AnonymousVMObject::create_for_physical_range(m_framebuffer_address, framebuffer_size_in_bytes());
60 if (!vmobject)
61 return KResult(-ENOMEM);
62 auto* region = process.allocate_region_with_vmobject(
63 preferred_vaddr,
64 framebuffer_size_in_bytes(),
65 vmobject.release_nonnull(),
66 0,
67 "MBVGA Framebuffer",
68 prot);
69 dbg() << "MBVGADevice: mmap with size " << region->size() << " at " << region->vaddr();
70 ASSERT(region);
71 return region;
72}
73
74int MBVGADevice::ioctl(FileDescription&, unsigned request, unsigned arg)
75{
76 REQUIRE_PROMISE(video);
77 switch (request) {
78 case FB_IOCTL_GET_SIZE_IN_BYTES: {
79 auto* out = (size_t*)arg;
80 if (!Process::current->validate_write_typed(out))
81 return -EFAULT;
82 *out = framebuffer_size_in_bytes();
83 return 0;
84 }
85 case FB_IOCTL_GET_BUFFER: {
86 auto* index = (int*)arg;
87 if (!Process::current->validate_write_typed(index))
88 return -EFAULT;
89 *index = 0;
90 return 0;
91 }
92 case FB_IOCTL_GET_RESOLUTION: {
93 auto* resolution = (FBResolution*)arg;
94 if (!Process::current->validate_write_typed(resolution))
95 return -EFAULT;
96 resolution->pitch = m_framebuffer_pitch;
97 resolution->width = m_framebuffer_width;
98 resolution->height = m_framebuffer_height;
99 return 0;
100 }
101 case FB_IOCTL_SET_RESOLUTION: {
102 auto* resolution = (FBResolution*)arg;
103 if (!Process::current->validate_read_typed(resolution) || !Process::current->validate_write_typed(resolution))
104 return -EFAULT;
105 resolution->pitch = m_framebuffer_pitch;
106 resolution->width = m_framebuffer_width;
107 resolution->height = m_framebuffer_height;
108 return 0;
109 }
110 default:
111 return -EINVAL;
112 };
113}
114
115}