kamkow1
7915986902
All checks were successful
Build documentation / build-and-deploy (push) Successful in 28s
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
#include <amd64/debug.h>
|
|
#include <amd64/io.h>
|
|
#include <libk/printf.h>
|
|
#include <libk/std.h>
|
|
#include <libk/string.h>
|
|
#include <sync/spin_lock.h>
|
|
#include <sys/debug.h>
|
|
|
|
/* Port for printing to serial */
|
|
/* TODO: Make this configurable */
|
|
#define PORT_COM1 0x03F8
|
|
/* debugprintf buffer size */
|
|
#define BUFFER_SIZE 1024
|
|
/*
|
|
* Lock, which ensures that prints to the serial port are atomic (ie. one debugprintf is atomic in
|
|
* itself).
|
|
*/
|
|
static spin_lock_t serial_lock = SPIN_LOCK_INIT;
|
|
|
|
static bool debug_init = false;
|
|
|
|
/* Block until TX buffer is empty */
|
|
static bool amd64_debug_serial_tx_empty (void) {
|
|
return (bool)(amd64_io_inb (PORT_COM1 + 5) & 0x20);
|
|
}
|
|
|
|
/* Write a single character to serial */
|
|
static void amd64_debug_serial_write (char x) {
|
|
while (!amd64_debug_serial_tx_empty ())
|
|
;
|
|
amd64_io_outb (PORT_COM1, (uint8_t)x);
|
|
}
|
|
|
|
/*
|
|
* Formatted printing to serial. serial_lock ensures that all prints are atomic.
|
|
*/
|
|
void debugprintf (const char* fmt, ...) {
|
|
if (!debug_init)
|
|
return;
|
|
|
|
char buffer[BUFFER_SIZE];
|
|
memset (buffer, 0, sizeof (buffer));
|
|
|
|
va_list ap;
|
|
va_start (ap, fmt);
|
|
vsnprintf (buffer, sizeof (buffer), fmt, ap);
|
|
va_end (ap);
|
|
|
|
buffer[sizeof (buffer) - 1] = '\0';
|
|
|
|
const char* p = buffer;
|
|
|
|
spin_lock (&serial_lock);
|
|
|
|
while (*p) {
|
|
amd64_debug_serial_write (*p);
|
|
p++;
|
|
}
|
|
|
|
spin_unlock (&serial_lock);
|
|
}
|
|
|
|
/* Initialize serial */
|
|
void amd64_debug_init (void) {
|
|
amd64_io_outb (PORT_COM1 + 1, 0x00);
|
|
amd64_io_outb (PORT_COM1 + 3, 0x80);
|
|
amd64_io_outb (PORT_COM1 + 0, 0x03);
|
|
amd64_io_outb (PORT_COM1 + 1, 0x00);
|
|
amd64_io_outb (PORT_COM1 + 3, 0x03);
|
|
amd64_io_outb (PORT_COM1 + 2, 0xC7);
|
|
amd64_io_outb (PORT_COM1 + 4, 0x0B);
|
|
|
|
debug_init = true;
|
|
}
|