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https://github.com/LadybirdBrowser/ladybird.git
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6a728e2d76
This new subsystem is replacing the old code that was used to create device nodes of framebuffer devices in /dev. This subsystem includes for now 3 roles: 1. GraphicsManagement singleton object that is used in the boot process to enumerate and initialize display devices. 2. GraphicsDevice(s) that are used to control the display adapter. 3. FramebufferDevice(s) that are used to control the device node in /dev. For now, we support the Bochs display adapter and any other generic VGA compatible adapter that was configured by the boot loader to a known and fixed resolution. Two improvements in the Bochs display adapter code are that we can support native bochs-display device (this device doesn't expose any VGA capabilities) and also that we use the MMIO region, to configure the device, instead of setting IO ports for such tasks.
114 lines
4.1 KiB
C++
114 lines
4.1 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Checked.h>
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#include <AK/Singleton.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Graphics/Bochs.h>
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#include <Kernel/Graphics/BochsFramebufferDevice.h>
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#include <Kernel/IO.h>
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#include <Kernel/PCI/Access.h>
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#include <Kernel/Process.h>
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#include <LibC/errno_numbers.h>
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#include <LibC/sys/ioctl_numbers.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<BochsFramebufferDevice> BochsFramebufferDevice::create(const BochsGraphicsAdapter& adapter, PhysicalAddress framebuffer_address, size_t pitch, size_t width, size_t height)
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{
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return adopt_ref(*new BochsFramebufferDevice(adapter, framebuffer_address, pitch, width, height));
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}
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UNMAP_AFTER_INIT BochsFramebufferDevice::BochsFramebufferDevice(const BochsGraphicsAdapter& adapter, PhysicalAddress framebuffer_address, size_t pitch, size_t width, size_t height)
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: FramebufferDevice(framebuffer_address, pitch, width, height)
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, m_bochs_adapter(adapter)
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{
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m_bochs_adapter->set_safe_resolution();
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m_framebuffer_width = 1024;
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m_framebuffer_height = 768;
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m_framebuffer_pitch = m_framebuffer_width * sizeof(u32);
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}
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void BochsFramebufferDevice::set_y_offset(size_t y_offset)
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{
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VERIFY(y_offset == 0 || y_offset == m_framebuffer_height);
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m_y_offset = y_offset;
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m_bochs_adapter->set_y_offset(y_offset);
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}
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int BochsFramebufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr arg)
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{
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REQUIRE_PROMISE(video);
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switch (request) {
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case FB_IOCTL_GET_SIZE_IN_BYTES: {
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auto* out = (size_t*)arg;
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size_t value = framebuffer_size_in_bytes();
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if (!copy_to_user(out, &value))
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return -EFAULT;
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return 0;
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}
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case FB_IOCTL_GET_BUFFER: {
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auto* index = (int*)arg;
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int value = m_y_offset == 0 ? 0 : 1;
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if (!copy_to_user(index, &value))
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return -EFAULT;
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return 0;
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}
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case FB_IOCTL_SET_BUFFER: {
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if (arg != 0 && arg != 1)
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return -EINVAL;
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set_y_offset(arg == 0 ? 0 : m_framebuffer_height);
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return 0;
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}
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case FB_IOCTL_GET_RESOLUTION: {
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auto* user_resolution = (FBResolution*)arg;
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FBResolution resolution;
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resolution.pitch = m_framebuffer_pitch;
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resolution.width = m_framebuffer_width;
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resolution.height = m_framebuffer_height;
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if (!copy_to_user(user_resolution, &resolution))
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return -EFAULT;
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return 0;
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}
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case FB_IOCTL_SET_RESOLUTION: {
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auto* user_resolution = (FBResolution*)arg;
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FBResolution resolution;
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if (!copy_from_user(&resolution, user_resolution))
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return -EFAULT;
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if (resolution.width > MAX_RESOLUTION_WIDTH || resolution.height > MAX_RESOLUTION_HEIGHT)
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return -EINVAL;
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if (!m_bochs_adapter->set_resolution(resolution.width, resolution.height)) {
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m_framebuffer_pitch = m_framebuffer_width * sizeof(u32);
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dbgln_if(BXVGA_DEBUG, "Reverting resolution: [{}x{}]", m_framebuffer_width, m_framebuffer_height);
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// Note: We try to revert everything back, and if it doesn't work, just assert.
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if (!m_bochs_adapter->set_resolution(m_framebuffer_width, m_framebuffer_height)) {
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VERIFY_NOT_REACHED();
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}
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resolution.pitch = m_framebuffer_pitch;
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resolution.width = m_framebuffer_width;
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resolution.height = m_framebuffer_height;
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if (!copy_to_user(user_resolution, &resolution))
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return -EFAULT;
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return -EINVAL;
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}
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m_framebuffer_width = resolution.width;
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m_framebuffer_height = resolution.height;
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m_framebuffer_pitch = m_framebuffer_width * sizeof(u32);
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dbgln_if(BXVGA_DEBUG, "New resolution: [{}x{}]", m_framebuffer_width, m_framebuffer_height);
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resolution.pitch = m_framebuffer_pitch;
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resolution.width = m_framebuffer_width;
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resolution.height = m_framebuffer_height;
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if (!copy_to_user(user_resolution, &resolution))
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return -EFAULT;
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return 0;
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}
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default:
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return -EINVAL;
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};
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}
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}
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