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Kernel/Graphics: Move all VGA related methods to GraphicsManagement

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This helps solving an issue when we boot with text mode screen so the
Kernel initializes an early text mode console, but even after disabling
it, that console can still access VGA ports. This wouldn't be a problem
for emulated hardware but bare metal hardware might have a "conflict",
especially if the native driver explicitly request to disable the VGA
emulation.
This commit is contained in:
Liav A 2022-03-15 21:41:22 +02:00 • committed by Linus Groh
commit 0ef1137e88
Notes: sideshowbarker 2024-07-17 17:13:16 +09:00
4 changed files with 58 additions and 18 deletions
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42
Kernel/Graphics/GraphicsManagement.cpp
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@ -51,6 +51,48 @@ bool GraphicsManagement::framebuffer_devices_console_only() const
return kernel_command_line().are_framebuffer_devices_enabled() == CommandLine::FrameBufferDevices::ConsoleOnly;
}
void GraphicsManagement::disable_vga_emulation_access_permanently()
{
SpinlockLocker locker(m_main_vga_lock);
disable_vga_text_mode_console_cursor();
IO::out8(0x3c4, 1);
u8 sr1 = IO::in8(0x3c5);
IO::out8(0x3c5, sr1 | 1 << 5);
IO::delay(1000);
m_vga_access_is_disabled = true;
}
void GraphicsManagement::enable_vga_text_mode_console_cursor() const
{
SpinlockLocker locker(m_main_vga_lock);
if (m_vga_access_is_disabled)
return;
IO::out8(0x3D4, 0xA);
IO::out8(0x3D5, 0);
}
void GraphicsManagement::disable_vga_text_mode_console_cursor() const
{
SpinlockLocker locker(m_main_vga_lock);
if (m_vga_access_is_disabled)
return;
IO::out8(0x3D4, 0xA);
IO::out8(0x3D5, 0x20);
}
void GraphicsManagement::set_vga_text_mode_cursor(size_t console_width, size_t x, size_t y) const
{
SpinlockLocker locker(m_main_vga_lock);
if (m_vga_access_is_disabled)
return;
enable_vga_text_mode_console_cursor();
u16 value = y * console_width + x;
IO::out8(0x3d4, 0x0e);
IO::out8(0x3d5, MSB(value));
IO::out8(0x3d4, 0x0f);
IO::out8(0x3d5, LSB(value));
}
void GraphicsManagement::deactivate_graphical_mode()
{
for (auto& graphics_device : m_graphics_devices) {