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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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9
Kernel/kprintf.cpp
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@ -11,6 +11,7 @@
#include <Kernel/Devices/ConsoleDevice.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/PCISerialDevice.h>
#include <Kernel/Graphics/Console/BootFramebufferConsole.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Locking/Spinlock.h>
#include <Kernel/TTY/ConsoleManagement.h>
@ -18,6 +19,10 @@
#include <LibC/stdarg.h>
namespace Kernel {
extern Atomic<Graphics::BootFramebufferConsole*> boot_framebuffer_console;
}
static bool serial_debug;
// A recursive spinlock allows us to keep writing in the case where a
// page fault happens in the middle of a dbgln(), etc
@ -75,6 +80,8 @@ static void critical_console_out(char ch)
// especially when we want to avoid any memory allocations...
if (GraphicsManagement::is_initialized() && GraphicsManagement::the().console()) {
GraphicsManagement::the().console()->write(ch, true);
} else if (auto* boot_console = boot_framebuffer_console.load()) {
boot_console->write(ch, true);
}
}
@ -92,6 +99,8 @@ static void console_out(char ch)
}
if (ConsoleManagement::is_initialized()) {
ConsoleManagement::the().debug_tty()->emit_char(ch);
} else if (auto* boot_console = boot_framebuffer_console.load()) {
boot_console->write(ch, true);
}
}