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https://github.com/RGBCube/serenity
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Kernel: Add serial_debug cmdline parameter
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.
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4 changed files with 89 additions and 8 deletions
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@ -6,6 +6,18 @@
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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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@ -22,8 +34,42 @@ static void color_off()
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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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@ -57,16 +103,23 @@ int ksprintf(char* buffer, const char* fmt, ...)
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return ret;
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}
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extern "C" int dbgputstr(const char* characters, int length)
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static void debugger_out(char ch)
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{
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for (int i = 0; i < length; ++i)
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IO::out8(0xe9, characters[i]);
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return 0;
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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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IO::out8(0xe9, ch);
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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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