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Kernel: Set up an initial boot framebuffer console

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Instead of seeing a black screen until GraphicsManagement was fully
initialized, this allows us to see the console output much earlier.
So, if the bootloader provided us with a framebuffer, set up a console
as early as possible.
This commit is contained in:
Tom 2022-01-28 20:42:23 -07:00 • committed by Andreas Kling
parent eb446725d5
commit 24f2f3ba4e
5 changed files with 121 additions and 2 deletions
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11
Kernel/init.cpp
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@ -33,6 +33,7 @@
#include <Kernel/Firmware/ACPI/Initialize.h>
#include <Kernel/Firmware/ACPI/Parser.h>
#include <Kernel/Firmware/SysFSFirmware.h>
#include <Kernel/Graphics/Console/BootFramebufferConsole.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/Interrupts/APIC.h>
@ -135,6 +136,8 @@ READONLY_AFTER_INIT u8 multiboot_framebuffer_bpp;
READONLY_AFTER_INIT u8 multiboot_framebuffer_type;
}
Atomic<Graphics::BootFramebufferConsole*> boot_framebuffer_console;
extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
{
g_in_early_boot = true;
@ -187,6 +190,12 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
CommandLine::initialize();
Memory::MemoryManager::initialize(0);
if (!multiboot_framebuffer_addr.is_null()) {
// NOTE: If the bootloader provided a framebuffer, then set up an initial console so we can see the output on the screen as soon as possible!
boot_framebuffer_console = &try_make_ref_counted<Graphics::BootFramebufferConsole>(multiboot_framebuffer_addr, multiboot_framebuffer_width, multiboot_framebuffer_height, multiboot_framebuffer_pitch).value().leak_ref();
}
dmesgln("Starting SerenityOS...");
DeviceManagement::initialize();
SysFSComponentRegistry::initialize();
DeviceManagement::the().attach_null_device(*NullDevice::must_initialize());
@ -224,8 +233,6 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
APIC::the().setup_ap_boot_environment();
}
dmesgln("Starting SerenityOS...");
{
RefPtr<Thread> init_stage2_thread;
(void)Process::create_kernel_process(init_stage2_thread, KString::must_create("init_stage2"), init_stage2, nullptr, THREAD_AFFINITY_DEFAULT, Process::RegisterProcess::No);