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Kernel/Graphics + SystemServer: Support text mode properly

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As we removed the support of VBE modesetting that was done by GRUB early
on boot, we need to determine if we can modeset the resolution with our
drivers, and if not, we should enable text mode and ensure that
SystemServer knows about it too.

Also, SystemServer should first check if there's a framebuffer device
node, which is an indication that text mode was not even if it was
requested. Then, if it doesn't find it, it should check what boot_mode
argument the user specified (in case it's self-test). This way if we
try to use bochs-display device (which is not VGA compatible) and
request a text mode, it will not honor the request and will continue
with graphical mode.

Also try to print critical messages with mininum memory allocations
possible.

In LibVT, We make the implementation flexible for kernel-specific
methods that are implemented in ConsoleImpl class.
This commit is contained in:
Liav A 2021-04-16 22:58:51 +03:00 • committed by Andreas Kling
parent dac129e10b
commit 20743e8aed
41 changed files with 1832 additions and 321 deletions
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29
Kernel/kprintf.cpp
View file

@ -7,9 +7,12 @@
#include <AK/PrintfImplementation.h>
#include <AK/Types.h>
#include <Kernel/ConsoleDevice.h>
#include <Kernel/Graphics/Console/Console.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/IO.h>
#include <Kernel/Process.h>
#include <Kernel/SpinLock.h>
#include <Kernel/TTY/ConsoleManagement.h>
#include <Kernel/kstdio.h>
#include <LibC/stdarg.h>
@ -60,6 +63,20 @@ static void serial_putch(char ch)
was_cr = false;
}
static void critical_console_out(char ch)
{
if (serial_debug)
serial_putch(ch);
// No need to output things to the real ConsoleDevice as no one is likely
// to read it (because we are in a fatal situation, so only print things and halt)
IO::out8(0xe9, ch);
// We emit chars directly to the string. this is necessary in few cases,
// especially when we want to avoid any memory allocations...
if (GraphicsManagement::is_initialized() && GraphicsManagement::the().console()) {
GraphicsManagement::the().console()->write(ch);
}
}
static void console_out(char ch)
{
if (serial_debug)
@ -72,6 +89,9 @@ static void console_out(char ch)
} else {
IO::out8(0xe9, ch);
}
if (ConsoleManagement::is_initialized()) {
ConsoleManagement::the().debug_tty()->emit_char(ch);
}
}
static void buffer_putch(char*& bufptr, char ch)
@ -145,3 +165,12 @@ extern "C" void kernelputstr(const char* characters, size_t length)
for (size_t i = 0; i < length; ++i)
console_out(characters[i]);
}
extern "C" void kernelcriticalputstr(const char* characters, size_t length)
{
if (!characters)
return;
ScopedSpinLock lock(s_log_lock);
for (size_t i = 0; i < length; ++i)
critical_console_out(characters[i]);
}