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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <Kernel/Bus/PCI/IDs.h>
#include <Kernel/CommandLine.h>
#include <Kernel/Graphics/Bochs/GraphicsAdapter.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Graphics/Intel/NativeGraphicsAdapter.h>
#include <Kernel/Graphics/VGACompatibleAdapter.h>
#include <Kernel/Graphics/VirtIOGPU/GraphicsAdapter.h>
#include <Kernel/IO.h>
#include <Kernel/Memory/AnonymousVMObject.h>
#include <Kernel/Multiboot.h>
#include <Kernel/Sections.h>
namespace Kernel {
static AK::Singleton<GraphicsManagement> s_the;
GraphicsManagement& GraphicsManagement::the()
{
return *s_the;
}
bool GraphicsManagement::is_initialized()
{
return s_the.is_initialized();
}
UNMAP_AFTER_INIT GraphicsManagement::GraphicsManagement()
: m_vga_font_region(MM.allocate_kernel_region(PAGE_SIZE, "VGA font", Region::Access::Read | Region::Access::Write, AllocationStrategy::AllocateNow).release_nonnull())
, m_framebuffer_devices_allowed(!kernel_command_line().is_no_framebuffer_devices_mode())
{
}
void GraphicsManagement::deactivate_graphical_mode()
{
for (auto& graphics_device : m_graphics_devices) {
graphics_device.enable_consoles();
}
}
void GraphicsManagement::activate_graphical_mode()
{
for (auto& graphics_device : m_graphics_devices) {
graphics_device.disable_consoles();
}
}
static inline bool is_vga_compatible_pci_device(PCI::Address address)
{
// Note: Check for Display Controller, VGA Compatible Controller or
// Unclassified, VGA-Compatible Unclassified Device
auto is_display_controller_vga_compatible = PCI::get_class(address) == 0x3 && PCI::get_subclass(address) == 0x0;
auto is_general_pci_vga_compatible = PCI::get_class(address) == 0x0 && PCI::get_subclass(address) == 0x1;
return is_display_controller_vga_compatible || is_general_pci_vga_compatible;
}
static inline bool is_display_controller_pci_device(PCI::Address address)
{
return PCI::get_class(address) == 0x3;
}
UNMAP_AFTER_INIT bool GraphicsManagement::determine_and_initialize_graphics_device(const PCI::Address& address, PCI::ID id)
{
VERIFY(is_vga_compatible_pci_device(address) || is_display_controller_pci_device(address));
auto add_and_configure_adapter = [&](GraphicsDevice& graphics_device) {
m_graphics_devices.append(graphics_device);
if (!m_framebuffer_devices_allowed) {
graphics_device.enable_consoles();
return;
}
graphics_device.initialize_framebuffer_devices();
};
RefPtr<GraphicsDevice> adapter;
switch (id.vendor_id) {
case PCI::VendorID::QEMUOld:
if (id.device_id == 0x1111)
adapter = BochsGraphicsAdapter::initialize(address);
break;
case PCI::VendorID::VirtualBox:
if (id.device_id == 0xbeef)
adapter = BochsGraphicsAdapter::initialize(address);
break;
case PCI::VendorID::Intel:
adapter = IntelNativeGraphicsAdapter::initialize(address);
break;
case PCI::VendorID::VirtIO:
dmesgln("Graphics: Using VirtIO console");
adapter = Graphics::VirtIOGPU::GraphicsAdapter::initialize(address);
break;
default:
if (!is_vga_compatible_pci_device(address))
break;
// Note: Although technically possible that a system has a
// non-compatible VGA graphics device that was initialized by the
// Multiboot bootloader to provide a framebuffer, in practice we
// probably want to support these devices natively instead of
// initializing them as some sort of a generic GraphicsDevice. For now,
// the only known example of this sort of device is qxl in QEMU. For VGA
// compatible devices we don't have a special driver for (e.g. ati-vga,
// qxl-vga, cirrus-vga, vmware-svga in QEMU), it's much more likely that
// these devices will be supported by the Multiboot loader that will
// utilize VESA BIOS extensions (that we don't currently) of these cards
// support, so we want to utilize the provided framebuffer of these
// devices, if possible.
if (!m_vga_adapter && PCI::is_io_space_enabled(address)) {
if (multiboot_framebuffer_type == MULTIBOOT_FRAMEBUFFER_TYPE_RGB) {
dmesgln("Graphics: Using a preset resolution from the bootloader");
adapter = VGACompatibleAdapter::initialize_with_preset_resolution(address,
multiboot_framebuffer_addr,
multiboot_framebuffer_width,
multiboot_framebuffer_height,
multiboot_framebuffer_pitch);
}
} else {
dmesgln("Graphics: Using a VGA compatible generic adapter");
adapter = VGACompatibleAdapter::initialize(address);
}
break;
}
if (!adapter)
return false;
add_and_configure_adapter(*adapter);
// Note: If IO space is enabled, this VGA adapter is operating in VGA mode.
// Note: If no other VGA adapter is attached as m_vga_adapter, we should attach it then.
if (!m_vga_adapter && PCI::is_io_space_enabled(address) && adapter->type() == GraphicsDevice::Type::VGACompatible) {
dbgln("Graphics adapter @ {} is operating in VGA mode", address);
m_vga_adapter = adapter;
}
return true;
}
UNMAP_AFTER_INIT bool GraphicsManagement::initialize()
{
/* Explanation on the flow when not requesting to force not creating any
* framebuffer devices:
* If the user wants to use a Console instead of the graphical environment,
* they doesn't need to request text mode.
* Graphical mode might not be accessible on bare-metal hardware because
* the bootloader didn't set a framebuffer and we don't have a native driver
* to set a framebuffer for it. We don't have VBE modesetting capabilities
* in the kernel yet, so what will happen is one of the following situations:
* 1. The bootloader didn't specify settings of a pre-set framebuffer. The
* kernel has a native driver for a detected display adapter, therefore
* the kernel can still set a framebuffer.
* 2. The bootloader specified settings of a pre-set framebuffer, and the
* kernel has a native driver for a detected display adapter, therefore
* the kernel can still set a framebuffer and change the settings of it.
* In that situation, the kernel will simply ignore the Multiboot pre-set
* framebuffer.
* 2. The bootloader specified settings of a pre-set framebuffer, and the
* kernel does not have a native driver for a detected display adapter,
* therefore the kernel will use the pre-set framebuffer. Modesetting is not
* available in this situation.
* 3. The bootloader didn't specify settings of a pre-set framebuffer, and
* the kernel does not have a native driver for a detected display adapter,
* therefore the kernel will try to initialize a VGA text mode console.
* In that situation, the kernel will assume that VGA text mode was already
* initialized, but will still try to modeset it. No switching to graphical
* environment is allowed in this case.
*
* By default, the kernel assumes that no framebuffer was created until it
* was proven that there's an existing framebuffer or we can modeset the
* screen resolution to create a framebuffer.
*
* If the user requests to force no initialization of framebuffer devices
* the same flow above will happen, except that no framebuffer device will
* be created, so SystemServer will not try to initialize WindowServer.
*/
if (kernel_command_line().is_no_framebuffer_devices_mode()) {
dbgln("Forcing no initialization of framebuffer devices");
}
PCI::enumerate([&](const PCI::Address& address, PCI::ID id) {
// Note: Each graphics controller will try to set its native screen resolution
// upon creation. Later on, if we don't want to have framebuffer devices, a
// framebuffer console will take the control instead.
if (!is_vga_compatible_pci_device(address) && !is_display_controller_pci_device(address))
return;
determine_and_initialize_graphics_device(address, id);
});
if (m_graphics_devices.is_empty()) {
dbgln("No graphics adapter was initialized.");
return false;
}
return true;
}
bool GraphicsManagement::framebuffer_devices_exist() const
{
for (auto& graphics_device : m_graphics_devices) {
if (graphics_device.framebuffer_devices_initialized())
return true;
}
return false;
}
}
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