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#include <stdarg.h>
#include <stdlib.h>
#include <printf.h>
#include <dbglog.h>
#include <config.h>
#include <sys.h>
// ==================================================================
#ifdef DBGLOG_TO_SCREEN
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
static uint8_t vga_color = 7;
static uint16_t* vga_buffer = 0;
static uint16_t vga_row = 0, vga_column = 0;
static uint16_t make_vgaentry(char c, uint8_t color) {
uint16_t c16 = c;
uint16_t color16 = color;
return c16 | color16 << 8;
}
static void vga_putentryat(char c, uint8_t color, size_t x, size_t y) {
const size_t index = y * VGA_WIDTH + x;
vga_buffer[index] = make_vgaentry(c, color);
}
static void vga_update_cursor() {
uint16_t cursor_location = vga_row * 80 + vga_column;
outb(0x3D4, 14); //Sending high cursor byte
outb(0x3D5, cursor_location >> 8);
outb(0x3D4, 15); //Sending high cursor byte
outb(0x3D5, cursor_location);
}
static void vga_init() {
vga_row = 0;
vga_column = 0;
vga_buffer = (uint16_t*) (&k_highhalf_addr + 0xB8000);
for (size_t y = 0; y < VGA_HEIGHT; y++) {
for (size_t x = 0; x < VGA_WIDTH; x++) {
vga_putentryat(' ', vga_color, x, y);
}
}
vga_update_cursor();
}
static void vga_scroll() {
for (size_t i = 0; i < VGA_WIDTH * (VGA_HEIGHT - 1); i++) {
vga_buffer[i] = vga_buffer[i + VGA_WIDTH];
}
for (size_t x = 0; x < VGA_WIDTH; x++) {
vga_putentryat(' ', vga_color, x, VGA_HEIGHT - 1);
}
vga_row--;
}
static void vga_newline() {
vga_column = 0;
if (++vga_row == VGA_HEIGHT) {
vga_scroll();
}
}
static void vga_putc(char c) {
if (c == '\n') {
vga_newline();
} else if (c == '\t') {
vga_putc(' ');
while (vga_column % 4 != 0) vga_putc(' ');
} else {
vga_putentryat(c, vga_color, vga_column, vga_row);
if (++vga_column == VGA_WIDTH) {
vga_newline();
}
}
}
static void vga_puts(const char* data) {
size_t datalen = strlen(data);
for (size_t i = 0; i < datalen; i++)
vga_putc(data[i]);
vga_update_cursor();
}
#endif // DBGLOG_TO_SCREEN
// ==================================================================
#ifdef DBGLOG_TO_SERIAL
#define SER_PORT 0x3F8 // COM1
static void serial_init() {
outb(SER_PORT + 1, 0x00); // disable interrupts
outb(SER_PORT + 3, 0x80); // set baud rate
outb(SER_PORT + 0, 0x03); // set divisor to 3 (38400 baud)
outb(SER_PORT + 1, 0x00);
outb(SER_PORT + 3, 0x03); // 8 bits, no parity, one stop bit
outb(SER_PORT + 2, 0xC7); // enable FIFO, clear them, with 14-byte threshold
}
static void serial_putc(const char c) {
while (!(inb(SER_PORT + 5) & 0x20));
outb(SER_PORT, c);
}
static void serial_puts(const char *c) {
while (*c) {
serial_putc(*c);
c++;
}
}
#endif // DBGLOG_TO_SERIAL
// ==================================================================
void dbglog_setup() {
#ifdef DBGLOG_TO_SCREEN
vga_init();
#endif
#ifdef DBGLOG_TO_SERIAL
serial_init();
#endif
}
void dbg_print(const char* str) {
#ifdef DBGLOG_TO_SCREEN
vga_puts(str);
#endif
#ifdef DBGLOG_TO_SERIAL
serial_puts(str);
#endif
}
void dbg_printf(const char* fmt, ...) {
va_list ap;
char buffer[256];
va_start(ap, fmt);
vsnprintf(buffer, 256, fmt, ap);
va_end(ap);
dbg_print(buffer);
}
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