Kernel/Graphics: Use DisplayConnector design with generic framebuffers

Kernel/Graphics/VGA/DisplayConnector.cpp

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Arch/x86/IO.h>
+#include <Kernel/Debug.h>
+#include <Kernel/Devices/DeviceManagement.h>
+#include <Kernel/Graphics/Console/ContiguousFramebufferConsole.h>
+#include <Kernel/Graphics/GraphicsManagement.h>
+#include <Kernel/Graphics/VGA/DisplayConnector.h>
+
+namespace Kernel {
+
+NonnullRefPtr<GenericDisplayConnector> GenericDisplayConnector::must_create_with_preset_resolution(PhysicalAddress framebuffer_address, size_t width, size_t height, size_t pitch)
+{
+    auto device_or_error = DeviceManagement::try_create_device<GenericDisplayConnector>(framebuffer_address, width, height, pitch);
+    VERIFY(!device_or_error.is_error());
+    auto connector = device_or_error.release_value();
+    MUST(connector->create_attached_framebuffer_console());
+    MUST(connector->initialize_edid_for_generic_monitor());
+    return connector;
+}
+
+GenericDisplayConnector::GenericDisplayConnector(PhysicalAddress framebuffer_address, size_t width, size_t height, size_t pitch)
+    : DisplayConnector()
+    , m_framebuffer_address(framebuffer_address)
+{
+    m_current_mode_setting.horizontal_active = width;
+    m_current_mode_setting.vertical_active = height;
+    m_current_mode_setting.horizontal_stride = pitch;
+}
+
+ErrorOr<void> GenericDisplayConnector::create_attached_framebuffer_console()
+{
+    auto width = m_current_mode_setting.horizontal_active;
+    auto height = m_current_mode_setting.vertical_active;
+    auto pitch = m_current_mode_setting.horizontal_stride;
+
+    auto rounded_size = TRY(Memory::page_round_up(pitch * height));
+    m_framebuffer_region = TRY(MM.allocate_kernel_region(m_framebuffer_address.page_base(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
+    [[maybe_unused]] auto result = m_framebuffer_region->set_write_combine(true);
+    m_framebuffer_data = m_framebuffer_region->vaddr().offset(m_framebuffer_address.offset_in_page()).as_ptr();
+    m_framebuffer_console = Graphics::ContiguousFramebufferConsole::initialize(m_framebuffer_address, width, height, pitch);
+    GraphicsManagement::the().set_console(*m_framebuffer_console);
+    return {};
+}
+
+ErrorOr<size_t> GenericDisplayConnector::write_to_first_surface(u64 offset, UserOrKernelBuffer const& buffer, size_t length)
+{
+    VERIFY(m_control_lock.is_locked());
+    if (offset + length > m_framebuffer_region->size())
+        return Error::from_errno(EOVERFLOW);
+    TRY(buffer.read(m_framebuffer_data + offset, 0, length));
+    return length;
+}
+
+void GenericDisplayConnector::enable_console()
+{
+    VERIFY(m_control_lock.is_locked());
+    VERIFY(m_framebuffer_console);
+    m_framebuffer_console->enable();
+}
+
+void GenericDisplayConnector::disable_console()
+{
+    VERIFY(m_control_lock.is_locked());
+    VERIFY(m_framebuffer_console);
+    m_framebuffer_console->disable();
+}
+
+ErrorOr<void> GenericDisplayConnector::flush_first_surface()
+{
+    return Error::from_errno(ENOTSUP);
+}
+
+}