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Kernel: Add serial_debug cmdline parameter

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serial_debug will output all the kprintf and dbgprintf data to COM1 at
8-N-1 57600 baud. this is particularly useful for debugging the boot
process on live hardware.

Note: it must be the first parameter in the boot cmdline.
This commit is contained in:
Conrad Pankoff 2019-08-11 14:43:38 +10:00 • committed by Andreas Kling
parent ee83b1bcf4
commit 3026c37d5d
4 changed files with 89 additions and 8 deletions
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23
Kernel/init.cpp
View file

@ -4,6 +4,7 @@
#include "RTC.h"
#include "Scheduler.h"
#include "kmalloc.h"
#include "kstdio.h"
#include <AK/Types.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Arch/i386/PIC.h>
@ -155,6 +156,25 @@ multiboot_info_t* multiboot_info_ptr;
extern "C" [[noreturn]] void init()
{
// this is only used one time, directly below here. we can't use this part
// of libc at this point in the boot process, or we'd just pull strstr in
// from <string.h>.
auto bad_prefix_check = [](const char *str, const char *search) -> bool {
while (*search)
if (*search++ != *str++)
return false;
return true;
};
// serial_debug will output all the kprintf and dbgprintf data to COM1 at
// 8-N-1 57600 baud. this is particularly useful for debugging the boot
// process on live hardware.
//
// note: it must be the first option in the boot cmdline.
if (multiboot_info_ptr->cmdline && bad_prefix_check(reinterpret_cast<const char*>(multiboot_info_ptr->cmdline), "serial_debug"))
set_serial_debug(true);
sse_init();
kmalloc_init();
@ -177,7 +197,8 @@ extern "C" [[noreturn]] void init()
ps2mouse = new PS2MouseDevice;
sb16 = new SB16;
dev_null = new NullDevice;
ttyS0 = new SerialDevice(SERIAL_COM1_ADDR, 64);
if (!get_serial_debug())
ttyS0 = new SerialDevice(SERIAL_COM1_ADDR, 64);
ttyS1 = new SerialDevice(SERIAL_COM2_ADDR, 65);
ttyS2 = new SerialDevice(SERIAL_COM3_ADDR, 66);
ttyS3 = new SerialDevice(SERIAL_COM4_ADDR, 67);