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Kernel: Add very simple BGA driver

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Only thing this is currently helpful is qemu when booting with -kernel
flag as that does not provide framebuffer info in multiboot headers
This commit is contained in:
Bananymous
2026-08-24 01:35:06 +03:00
parent 9a9a4fe8c0
commit cd6269d406
11 changed files with 442 additions and 37 deletions
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kernel/kernel/kernel.cpp
+48 -19
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@@ -68,6 +68,8 @@ static bool should_disable_serial(BAN::StringView full_command_line)
extern bool g_disable_debug;
static ParsedCommandLine cmdline;
static bool s_has_early_console { false };
static void parse_command_line()
{
auto full_command_line = Kernel::g_boot_info.command_line.sv();
@@ -160,7 +162,24 @@ extern "C" void kernel_main(uint32_t boot_magic, uint32_t boot_info)
if (auto ret = TerminalDriver::initialize_from_boot_info(); ret.is_error())
dprintln("failed to initialize terminal driver: {}", ret.error());
else
dprintln("terminal driver initialized");
{
MUST(VirtualTTY::create(g_terminal_driver));
dprintln("Virtual TTY initialized");
}
if (Serial::has_devices())
{
Serial::initialize_devices();
dprintln("Serial devices initialized");
}
if (auto ret = DevFileSystem::get().root_inode()->find_inode(cmdline.console); !ret.is_error())
{
auto console = ret.release_value();
ASSERT(console->is_tty());
static_cast<Kernel::TTY*>(console.ptr())->set_as_current();
s_has_early_console = true;
}
if (!cmdline.disable_smp)
InterruptController::get().initialize_multiprocessor();
@@ -171,18 +190,6 @@ extern "C" void kernel_main(uint32_t boot_magic, uint32_t boot_info)
MUST(SharedMemoryObjectManager::initialize());
dprintln("Shared memory object system initialized");
if (Serial::has_devices())
{
Serial::initialize_devices();
dprintln("Serial devices initialized");
}
if (g_terminal_driver)
{
auto vtty = MUST(VirtualTTY::create(g_terminal_driver));
dprintln("Virtual TTY initialized");
}
Random::initialize();
dprintln("RNG initialized");
@@ -213,10 +220,6 @@ static void init2(void*)
ProcFileSystem::get().post_scheduler_initialize();
auto console = MUST(DevFileSystem::get().root_inode()->find_inode(cmdline.console));
ASSERT(console->is_tty());
static_cast<Kernel::TTY*>(console.ptr())->set_as_current();
// This only initializes PCIManager by enumerating available devices and choosing PCIe/legacy
// ACPI might require PCI access during its namespace initialization
PCI::PCIManager::initialize();
@@ -256,6 +259,32 @@ static void init2(void*)
PCI::PCIManager::get().initialize_devices(cmdline.disable_usb);
dprintln("PCI devices initialized");
if (!s_has_early_console)
{
auto console_or_error = DevFileSystem::get().root_inode()->find_inode(cmdline.console);
if (!console_or_error.is_error())
{
auto console = console_or_error.release_value();
ASSERT(console->is_tty());
static_cast<TTY*>(console.ptr())->set_as_current();
}
else
{
BAN::RefPtr<TTY> tty;
DevFileSystem::get().for_each_inode([&](BAN::RefPtr<Inode> inode) -> BAN::Iteration {
if (!inode->is_tty())
return BAN::Iteration::Continue;
tty = static_cast<TTY*>(inode.ptr());
return BAN::Iteration::Break;
});
ASSERT(tty);
dwarnln("Could not find /dev/{}, falling back to /dev/{}", cmdline.console, tty->name());
tty->set_as_current();
}
}
VirtualFileSystem::initialize(cmdline.root);
dprintln("VFS initialized");
@@ -266,9 +295,9 @@ static void init2(void*)
Banos::initialize_initial_drivers();
auto console_path = MUST(BAN::String::formatted("/dev/{}", cmdline.console));
auto console_path = MUST(BAN::String::formatted("/dev/{}", TTY::current()->name()));
auto console_path_sv = console_path.sv();
MUST(Process::create_userspace({ 0, 0, 0, 0 }, "/usr/bin/init"_sv, BAN::Span<BAN::StringView>(&console_path_sv, 1)));
MUST(Process::create_userspace({ 0, 0, 0, 0 }, "/usr/bin/init"_sv, { &console_path_sv, 1 }));
}
extern "C" void ap_main()