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Kernel: Instantiate a TextModeConsole early on if there's no framebuffer

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If the bootloader that loaded us is providing a framebuffer details from
the Multiboot protocol then we can instantiate a framebuffer console.
Otherwise, we should use a text mode console, assuming that the BIOS and
the bootloader didn't try to modeset the screen resolution so we have is
a VGA 80x25 text mode being displayed on screen.

Since "boot_framebuffer_console" is no longer a good representative as a
global variable name, it's changed to g_boot_console to match the fact
that it can be assigned with a text mode console and not framebuffer
console if needed.
This commit is contained in:
Liav A 2022-02-09 21:09:41 +02:00 • committed by Linus Groh
parent 278b0aa629
commit c6c3e2a7fd
3 changed files with 14 additions and 9 deletions
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11
Kernel/init.cpp
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@ -34,6 +34,7 @@
#include <Kernel/Firmware/ACPI/Parser.h>
#include <Kernel/Firmware/SysFSFirmware.h>
#include <Kernel/Graphics/Console/BootFramebufferConsole.h>
#include <Kernel/Graphics/Console/TextModeConsole.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/Interrupts/APIC.h>
@ -136,7 +137,7 @@ READONLY_AFTER_INIT u8 multiboot_framebuffer_bpp;
READONLY_AFTER_INIT u8 multiboot_framebuffer_type;
}
Atomic<Graphics::BootFramebufferConsole*> boot_framebuffer_console;
Atomic<Graphics::Console*> g_boot_console;
extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
{
@ -190,9 +191,13 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
CommandLine::initialize();
Memory::MemoryManager::initialize(0);
// NOTE: If the bootloader provided a framebuffer, then set up an initial console.
// If the bootloader didn't provide a framebuffer, then set up an initial text console.
// We do so we can see the output on the screen as soon as possible.
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();
g_boot_console = &try_make_ref_counted<Graphics::BootFramebufferConsole>(multiboot_framebuffer_addr, multiboot_framebuffer_width, multiboot_framebuffer_height, multiboot_framebuffer_pitch).value().leak_ref();
} else {
g_boot_console = &Graphics::TextModeConsole::initialize().leak_ref();
}
dmesgln("Starting SerenityOS...");