fb488e2b27
If we have a VGA-capable graphics adapter that we support, we should prefer it over any legacy VGA because we wouldn't use it in legacy VGA mode in this case. This solves the problem where we would only use the legacy VGA card when both a legacy VGA card as well as a VGA-mode capable adapter is present.
191 lines
7.9 KiB
C++
191 lines
7.9 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/CommandLine.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Graphics/BochsGraphicsAdapter.h>
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#include <Kernel/Graphics/Console/FramebufferConsole.h>
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#include <Kernel/Graphics/Console/TextModeConsole.h>
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#include <Kernel/Graphics/GraphicsManagement.h>
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#include <Kernel/Graphics/IntelNativeGraphicsAdapter.h>
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#include <Kernel/Graphics/VGACompatibleAdapter.h>
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#include <Kernel/IO.h>
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#include <Kernel/Multiboot.h>
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#include <Kernel/PCI/IDs.h>
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#include <Kernel/Panic.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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namespace Kernel {
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static AK::Singleton<GraphicsManagement> s_the;
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GraphicsManagement& GraphicsManagement::the()
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{
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return *s_the;
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}
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bool GraphicsManagement::is_initialized()
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{
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return s_the.is_initialized();
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}
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UNMAP_AFTER_INIT GraphicsManagement::GraphicsManagement()
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: m_vga_font_region(MM.allocate_kernel_region(PAGE_SIZE, "VGA font", Region::Access::Read | Region::Access::Write, AllocationStrategy::AllocateNow).release_nonnull())
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, m_framebuffer_devices_allowed(!kernel_command_line().is_no_framebuffer_devices_mode())
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{
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}
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void GraphicsManagement::deactivate_graphical_mode()
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{
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for (auto& graphics_device : m_graphics_devices) {
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graphics_device.enable_consoles();
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}
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}
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void GraphicsManagement::activate_graphical_mode()
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{
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for (auto& graphics_device : m_graphics_devices) {
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graphics_device.disable_consoles();
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}
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}
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static inline bool is_vga_compatible_pci_device(PCI::Address address)
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{
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return PCI::get_class(address) == 0x3 && PCI::get_subclass(address) == 0x0;
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}
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UNMAP_AFTER_INIT bool GraphicsManagement::initialize()
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{
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/* Explanation on the flow when not requesting to force not creating any
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* framebuffer devices:
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* If the user wants to use a Console instead of the graphical environment,
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* they doesn't need to request text mode.
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* Graphical mode might not be accessible on bare-metal hardware because
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* the bootloader didn't set a framebuffer and we don't have a native driver
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* to set a framebuffer for it. We don't have VBE modesetting capabilities
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* in the kernel yet, so what will happen is one of the following situations:
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* 1. The bootloader didn't specify settings of a pre-set framebuffer. The
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* kernel has a native driver for a detected display adapter, therefore
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* the kernel can still set a framebuffer.
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* 2. The bootloader specified settings of a pre-set framebuffer, and the
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* kernel has a native driver for a detected display adapter, therefore
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* the kernel can still set a framebuffer and change the settings of it.
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* In that situation, the kernel will simply ignore the Multiboot pre-set
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* framebuffer.
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* 2. The bootloader specified settings of a pre-set framebuffer, and the
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* kernel does not have a native driver for a detected display adapter,
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* therefore the kernel will use the pre-set framebuffer. Modesetting is not
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* available in this situation.
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* 3. The bootloader didn't specify settings of a pre-set framebuffer, and
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* the kernel does not have a native driver for a detected display adapter,
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* therefore the kernel will try to initialize a VGA text mode console.
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* In that situation, the kernel will assume that VGA text mode was already
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* initialized, but will still try to modeset it. No switching to graphical
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* environment is allowed in this case.
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*
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* By default, the kernel assumes that no framebuffer was created until it
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* was proven that there's an existing framebuffer or we can modeset the
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* screen resolution to create a framebuffer.
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*
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* If the user requests to force no initialization of framebuffer devices
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* the same flow above will happen, except that no framebuffer device will
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* be created, so SystemServer will not try to initialize WindowServer.
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*/
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if (kernel_command_line().is_no_framebuffer_devices_mode()) {
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dbgln("Forcing no initialization of framebuffer devices");
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}
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auto add_and_initialize_adapter = [&](NonnullRefPtr<GraphicsDevice> display_adapter) {
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m_graphics_devices.append(display_adapter);
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if (!m_framebuffer_devices_allowed) {
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display_adapter->enable_consoles();
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return;
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}
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display_adapter->initialize_framebuffer_devices();
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};
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auto have_adapter_for_address = [&](const PCI::Address& address) {
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for (auto& adapter : m_graphics_devices) {
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if (adapter.device_pci_address() == address)
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return true;
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}
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return false;
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};
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Vector<PCI::Address, 8> uninitialized_vga_pci_addresses;
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PCI::enumerate([&](const PCI::Address& address, PCI::ID id) {
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// Note: Each graphics controller will try to set its native screen resolution
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// upon creation. Later on, if we don't want to have framebuffer devices, a
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// framebuffer console will take the control instead.
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RefPtr<GraphicsDevice> adapter;
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bool is_vga_compatible = is_vga_compatible_pci_device(address);
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if ((id.vendor_id == 0x1234 && id.device_id == 0x1111) || (id.vendor_id == 0x80ee && id.device_id == 0xbeef)) {
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adapter = BochsGraphicsAdapter::initialize(address);
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} else if (is_vga_compatible) {
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if (id.vendor_id == 0x8086) {
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adapter = IntelNativeGraphicsAdapter::initialize(address);
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}
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}
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if (adapter)
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add_and_initialize_adapter(adapter.release_nonnull());
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else if (is_vga_compatible)
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uninitialized_vga_pci_addresses.append(address);
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});
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if (!uninitialized_vga_pci_addresses.is_empty()) {
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for (auto& address : uninitialized_vga_pci_addresses) {
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VERIFY(is_vga_compatible_pci_device(address));
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VERIFY(!have_adapter_for_address(address));
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if (multiboot_info_ptr->framebuffer_type == MULTIBOOT_FRAMEBUFFER_TYPE_RGB) {
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dmesgln("Graphics: Using a preset resolution from the bootloader");
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auto vga_adapter = VGACompatibleAdapter::initialize_with_preset_resolution(address,
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PhysicalAddress((u32)(multiboot_info_ptr->framebuffer_addr)),
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multiboot_info_ptr->framebuffer_width,
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multiboot_info_ptr->framebuffer_height,
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multiboot_info_ptr->framebuffer_pitch);
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m_vga_adapter = vga_adapter;
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add_and_initialize_adapter(move(vga_adapter));
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} else {
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dmesgln("Graphics: Using a VGA compatible generic adapter");
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auto vga_adapter = VGACompatibleAdapter::initialize(address);
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m_vga_adapter = vga_adapter;
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add_and_initialize_adapter(move(vga_adapter));
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}
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break; // We can only have one vga adapter
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}
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// If we still don't have a VGA compatible adapter, check if any of the ones
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// we support explicitly happens to be able to operate in VGA mode
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if (!m_vga_adapter) {
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for (auto& adapter : m_graphics_devices) {
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// If IO space is enabled, this VGA adapter is operating in VGA mode.
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if (adapter.type() == GraphicsDevice::Type::VGACompatible && !m_vga_adapter && PCI::is_io_space_enabled(adapter.device_pci_address())) {
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dbgln("Graphics adapter @ {} is operating in VGA mode", adapter.device_pci_address());
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m_vga_adapter = adapter;
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break;
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}
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}
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}
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}
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if (m_graphics_devices.is_empty()) {
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dbgln("No graphics adapter was initialized.");
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return false;
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}
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return true;
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}
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bool GraphicsManagement::framebuffer_devices_exist() const
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{
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for (auto& graphics_device : m_graphics_devices) {
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if (graphics_device.framebuffer_devices_initialized())
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return true;
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}
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return false;
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}
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}
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