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72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
#include <amd64/debug.h>
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#include <amd64/io.h>
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#include <libk/printf.h>
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#include <libk/std.h>
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#include <libk/string.h>
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#include <sync/spin_lock.h>
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#include <sys/debug.h>
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/// Port for printing to serial
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#define PORT_COM1 0x03F8
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/// \ref debugprintf buffer size
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#define BUFFER_SIZE 1024
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/// Lock, which ensures that prints to the serial port are atomic
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static spin_lock_t serial_lock = SPIN_LOCK_INIT;
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static bool debug_init = false;
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/// Block until TX buffer is empty
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static bool amd64_debug_serial_tx_empty (void) {
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return (bool)(amd64_io_inb (PORT_COM1 + 5) & 0x20);
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}
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/// Write a single character to serial
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static void amd64_debug_serial_write (char x) {
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while (!amd64_debug_serial_tx_empty ())
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;
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amd64_io_outb (PORT_COM1, (uint8_t)x);
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}
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/**
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* @brief Formatted printing to serial. \ref serial_lock ensures that
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* all prints are atomic.
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*/
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void debugprintf (const char* fmt, ...) {
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if (!debug_init)
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return;
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char buffer[BUFFER_SIZE];
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memset (buffer, 0, sizeof (buffer));
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va_list ap;
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va_start (ap, fmt);
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vsnprintf (buffer, sizeof (buffer), fmt, ap);
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va_end (ap);
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buffer[sizeof (buffer) - 1] = '\0';
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const char* p = buffer;
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spin_lock (&serial_lock);
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while (*p) {
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amd64_debug_serial_write (*p);
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p++;
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}
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spin_unlock (&serial_lock);
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}
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/// Initialize serial
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void amd64_debug_init (void) {
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amd64_io_outb (PORT_COM1 + 1, 0x00);
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amd64_io_outb (PORT_COM1 + 3, 0x80);
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amd64_io_outb (PORT_COM1 + 0, 0x03);
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amd64_io_outb (PORT_COM1 + 1, 0x00);
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amd64_io_outb (PORT_COM1 + 3, 0x03);
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amd64_io_outb (PORT_COM1 + 2, 0xC7);
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amd64_io_outb (PORT_COM1 + 4, 0x0B);
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debug_init = true;
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}
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