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https://github.com/LadybirdBrowser/ladybird.git
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3026c37d5d
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.
135 lines
2.5 KiB
C++
135 lines
2.5 KiB
C++
#include <AK/PrintfImplementation.h>
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#include <AK/Types.h>
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#include <Kernel/Console.h>
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#include <Kernel/IO.h>
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#include <Kernel/Process.h>
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#include <Kernel/kstdio.h>
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#include <LibC/stdarg.h>
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static bool serial_debug;
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void set_serial_debug(bool on_or_off)
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{
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serial_debug = on_or_off;
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}
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int get_serial_debug()
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{
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return serial_debug;
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}
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static void color_on()
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{
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IO::out8(0xe9, 0x1b);
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IO::out8(0xe9, '[');
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IO::out8(0xe9, '3');
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IO::out8(0xe9, '6');
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IO::out8(0xe9, 'm');
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}
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static void color_off()
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{
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IO::out8(0xe9, 0x1b);
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IO::out8(0xe9, '[');
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IO::out8(0xe9, '0');
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IO::out8(0xe9, 'm');
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}
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static void serial_putch(char ch)
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{
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static bool serial_ready = false;
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static bool was_cr = false;
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if (!serial_ready) {
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IO::out8(0x3F8 + 1, 0x00);
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IO::out8(0x3F8 + 3, 0x80);
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IO::out8(0x3F8 + 0, 0x02);
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IO::out8(0x3F8 + 1, 0x00);
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IO::out8(0x3F8 + 3, 0x03);
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IO::out8(0x3F8 + 2, 0xC7);
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IO::out8(0x3F8 + 4, 0x0B);
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serial_ready = true;
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}
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while ((IO::in8(0x3F8 + 5) & 0x20) == 0)
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;
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if (ch == '\n' && !was_cr)
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IO::out8(0x3F8, '\r');
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IO::out8(0x3F8, ch);
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if (ch == '\r')
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was_cr = true;
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else
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was_cr = false;
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}
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static void console_putch(char*&, char ch)
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{
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if (serial_debug)
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serial_putch(ch);
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if (!current) {
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IO::out8(0xe9, ch);
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return;
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}
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Console::the().put_char(ch);
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}
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int kprintf(const char* fmt, ...)
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{
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color_on();
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va_list ap;
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va_start(ap, fmt);
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int ret = printf_internal(console_putch, nullptr, fmt, ap);
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va_end(ap);
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color_off();
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return ret;
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}
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static void buffer_putch(char*& bufptr, char ch)
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{
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*bufptr++ = ch;
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}
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int ksprintf(char* buffer, const char* fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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int ret = printf_internal(buffer_putch, buffer, fmt, ap);
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buffer[ret] = '\0';
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va_end(ap);
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return ret;
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}
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static void debugger_out(char ch)
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{
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if (serial_debug)
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serial_putch(ch);
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IO::out8(0xe9, ch);
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}
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static void debugger_putch(char*&, char ch)
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{
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debugger_out(ch);
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}
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extern "C" int dbgputstr(const char* characters, int length)
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{
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for (int i = 0; i < length; ++i)
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debugger_out(characters[i]);
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return 0;
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}
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extern "C" int dbgprintf(const char* fmt, ...)
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{
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color_on();
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va_list ap;
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va_start(ap, fmt);
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int ret = printf_internal(debugger_putch, nullptr, fmt, ap);
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va_end(ap);
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color_off();
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return ret;
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}
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