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Kernel/Graphics: Use DisplayConnector design for the Bochs driver
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8 changed files with 450 additions and 226 deletions
161
Kernel/Graphics/Bochs/DisplayConnector.cpp
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161
Kernel/Graphics/Bochs/DisplayConnector.cpp
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/*
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* Copyright (c) 2022, 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 <Kernel/Arch/x86/IO.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Graphics/Bochs/Definitions.h>
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#include <Kernel/Graphics/Bochs/DisplayConnector.h>
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#include <Kernel/Graphics/Console/ContiguousFramebufferConsole.h>
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#include <Kernel/Graphics/GraphicsManagement.h>
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namespace Kernel {
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NonnullRefPtr<BochsDisplayConnector> BochsDisplayConnector::must_create(PhysicalAddress framebuffer_address)
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{
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auto device_or_error = DeviceManagement::try_create_device<BochsDisplayConnector>(framebuffer_address);
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VERIFY(!device_or_error.is_error());
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auto connector = device_or_error.release_value();
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MUST(connector->create_attached_framebuffer_console());
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MUST(connector->initialize_edid_for_generic_monitor());
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return connector;
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}
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BochsDisplayConnector::BochsDisplayConnector(PhysicalAddress framebuffer_address)
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: DisplayConnector()
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, m_framebuffer_address(framebuffer_address)
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{
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}
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ErrorOr<void> BochsDisplayConnector::create_attached_framebuffer_console()
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{
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auto rounded_size = TRY(Memory::page_round_up(1024 * sizeof(u32) * 768 * 2));
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m_framebuffer_region = TRY(MM.allocate_kernel_region(m_framebuffer_address.page_base(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
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[[maybe_unused]] auto result = m_framebuffer_region->set_write_combine(true);
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m_framebuffer_data = m_framebuffer_region->vaddr().offset(m_framebuffer_address.offset_in_page()).as_ptr();
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// We assume safe resolution is 1024x768x32
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m_framebuffer_console = Graphics::ContiguousFramebufferConsole::initialize(m_framebuffer_address, 1024, 768, 1024 * sizeof(u32));
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GraphicsManagement::the().set_console(*m_framebuffer_console);
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return {};
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}
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static void set_register_with_io(u16 index, u16 data)
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{
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IO::out16(VBE_DISPI_IOPORT_INDEX, index);
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IO::out16(VBE_DISPI_IOPORT_DATA, data);
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}
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static u16 get_register_with_io(u16 index)
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{
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IO::out16(VBE_DISPI_IOPORT_INDEX, index);
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return IO::in16(VBE_DISPI_IOPORT_DATA);
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}
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BochsDisplayConnector::IndexID BochsDisplayConnector::index_id() const
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{
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return get_register_with_io(0);
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}
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ErrorOr<size_t> BochsDisplayConnector::write_to_first_surface(u64 offset, UserOrKernelBuffer const& buffer, size_t length)
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{
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VERIFY(m_control_lock.is_locked());
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if (offset + length > m_framebuffer_region->size())
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return Error::from_errno(EOVERFLOW);
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TRY(buffer.read(m_framebuffer_data + offset, 0, length));
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return length;
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}
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void BochsDisplayConnector::enable_console()
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{
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VERIFY(m_control_lock.is_locked());
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VERIFY(m_framebuffer_console);
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m_framebuffer_console->enable();
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}
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void BochsDisplayConnector::disable_console()
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{
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VERIFY(m_control_lock.is_locked());
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VERIFY(m_framebuffer_console);
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m_framebuffer_console->disable();
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}
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ErrorOr<void> BochsDisplayConnector::flush_first_surface()
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{
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return Error::from_errno(ENOTSUP);
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}
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ErrorOr<void> BochsDisplayConnector::set_safe_mode_setting()
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{
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DisplayConnector::ModeSetting safe_mode_set {
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.horizontal_stride = 1024 * sizeof(u32),
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.pixel_clock_in_khz = 0, // Note: There's no pixel clock in paravirtualized hardware
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.horizontal_active = 1024,
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.horizontal_front_porch_pixels = 0, // Note: There's no horizontal_front_porch_pixels in paravirtualized hardware
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.horizontal_sync_time_pixels = 0, // Note: There's no horizontal_sync_time_pixels in paravirtualized hardware
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.horizontal_blank_pixels = 0, // Note: There's no horizontal_blank_pixels in paravirtualized hardware
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.vertical_active = 768,
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.vertical_front_porch_lines = 0, // Note: There's no vertical_front_porch_lines in paravirtualized hardware
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.vertical_sync_time_lines = 0, // Note: There's no vertical_sync_time_lines in paravirtualized hardware
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.vertical_blank_lines = 0, // Note: There's no vertical_blank_lines in paravirtualized hardware
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.horizontal_offset = 0,
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.vertical_offset = 0,
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};
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return set_mode_setting(safe_mode_set);
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}
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ErrorOr<void> BochsDisplayConnector::set_mode_setting(ModeSetting const& mode_setting)
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{
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SpinlockLocker locker(m_modeset_lock);
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size_t width = mode_setting.horizontal_active;
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size_t height = mode_setting.vertical_active;
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dbgln_if(BXVGA_DEBUG, "BochsDisplayConnector resolution registers set to - {}x{}", width, height);
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set_register_with_io(to_underlying(BochsDISPIRegisters::ENABLE), 0);
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set_register_with_io(to_underlying(BochsDISPIRegisters::XRES), (u16)width);
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set_register_with_io(to_underlying(BochsDISPIRegisters::YRES), (u16)height);
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set_register_with_io(to_underlying(BochsDISPIRegisters::VIRT_WIDTH), (u16)width);
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set_register_with_io(to_underlying(BochsDISPIRegisters::VIRT_HEIGHT), (u16)height * 2);
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set_register_with_io(to_underlying(BochsDISPIRegisters::BPP), 32);
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set_register_with_io(to_underlying(BochsDISPIRegisters::ENABLE), to_underlying(BochsFramebufferSettings::Enabled) | to_underlying(BochsFramebufferSettings::LinearFramebuffer));
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set_register_with_io(to_underlying(BochsDISPIRegisters::BANK), 0);
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if ((u16)width != get_register_with_io(to_underlying(BochsDISPIRegisters::XRES)) || (u16)height != get_register_with_io(to_underlying(BochsDISPIRegisters::YRES))) {
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return Error::from_errno(ENOTIMPL);
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}
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auto current_horizontal_active = get_register_with_io(to_underlying(BochsDISPIRegisters::XRES));
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auto current_vertical_active = get_register_with_io(to_underlying(BochsDISPIRegisters::YRES));
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DisplayConnector::ModeSetting mode_set {
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.horizontal_stride = current_horizontal_active * sizeof(u32),
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.pixel_clock_in_khz = 0, // Note: There's no pixel clock in paravirtualized hardware
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.horizontal_active = current_horizontal_active,
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.horizontal_front_porch_pixels = 0, // Note: There's no horizontal_front_porch_pixels in paravirtualized hardware
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.horizontal_sync_time_pixels = 0, // Note: There's no horizontal_sync_time_pixels in paravirtualized hardware
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.horizontal_blank_pixels = 0, // Note: There's no horizontal_blank_pixels in paravirtualized hardware
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.vertical_active = current_vertical_active,
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.vertical_front_porch_lines = 0, // Note: There's no vertical_front_porch_lines in paravirtualized hardware
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.vertical_sync_time_lines = 0, // Note: There's no vertical_sync_time_lines in paravirtualized hardware
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.vertical_blank_lines = 0, // Note: There's no vertical_blank_lines in paravirtualized hardware
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.horizontal_offset = 0,
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.vertical_offset = 0,
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};
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m_current_mode_setting = mode_set;
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return {};
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}
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ErrorOr<void> BochsDisplayConnector::set_y_offset(size_t)
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{
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// Note: Although when using this device on QEMU we can actually set the horizontal and vertical offsets
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// with IO ports, this class is meant to be used for plain old Bochs graphics which might not support
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// this feature at all.
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return Error::from_errno(ENOTIMPL);
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}
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ErrorOr<void> BochsDisplayConnector::unblank()
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{
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return Error::from_errno(ENOTIMPL);
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}
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}
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