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console.c
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console.c
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/*
* Copyright (C) 2013 - Simone Rotondo - http://www.piemontewireless.net/
* simOS - tiny x86 kernel
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// standard includes
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdarg.h>
// simOS includes
#include "console.h"
#include "utils.h"
/* ====== Globals ====== */
size_t console_row;
size_t console_column;
uint8_t console_color;
uint16_t* console_buffer;
/* ====== PRIVATE console functions ====== */
static uint8_t __make_color(enum vga_color fg, enum vga_color bg)
{
return fg | bg << 4;
}
static uint16_t __make_vgaentry(char c, uint8_t color)
{
uint16_t c16 = c;
uint16_t color16 = color;
return c16 | color16 << 8;
}
static void __ultoa(char *buf, unsigned long value)
{
int i, ndigits = 0;
// generate digits in reverse order
do {
buf[ndigits++] = (value % 10) + '0';
value /= 10;
} while (value > 0);
// reverse digits to put them in the correct order
for (i = 0; i < ndigits/2; ++i) {
int swap_pos = ndigits - (i+1);
char t = buf[i];
buf[i] = buf[swap_pos];
buf[swap_pos] = t;
}
// terminate the string
buf[ndigits] = '\0';
}
static void __ltoa(char *buf, long value)
{
unsigned raw;
// handle negative values by converting to positive magnitude
if (value < 0) {
*buf++ = '-';
raw = (unsigned) -value;
} else {
raw = (unsigned) value;
}
__ultoa(buf, raw);
}
static void __ltox(char *buf, long value)
{
int i;
for (i = 28; i >= 0; i -= 4) {
*buf++ = "0123456789ABCDEF"[(value >> i) & 0xF];
}
*buf = '\0';
}
static void __scroll(void)
{
int j;
// move rows 1..VGA_NUMROWS-1 up one row
for (j = 1; j < VGA_NUMROWS; j++) {
memcpy(ROW_ADDR(j-1), ROW_ADDR(j), VGA_BYTES_PER_ROW);
}
// clear last row
memset(ROW_ADDR(VGA_NUMROWS-1), '\0', VGA_BYTES_PER_ROW);
}
/* ====== PUBLIC console functions ====== */
void console__initialize()
{
console_row = 0;
console_column = 0;
console_color = __make_color(COLOR_LIGHT_GREY, COLOR_BLACK);
console_buffer = (uint16_t*) 0xB8000;
for ( size_t y = 0; y < VGA_NUMROWS; y++ )
{
for ( size_t x = 0; x < VGA_NUMCOLS; x++ )
{
const size_t index = y * VGA_NUMCOLS + x;
console_buffer[index] = __make_vgaentry(' ', console_color);
}
}
}
void console__setcolor(uint8_t color)
{
console_color = color;
}
void console__putentryat(char c, uint8_t color, size_t x, size_t y)
{
const size_t index = y * VGA_NUMCOLS + x;
console_buffer[index] = __make_vgaentry(c, color);
}
void console__putchar(char c)
{
if (c == '\n') {
console_column = 0;
/* scroll? */
if (console_row == VGA_NUMROWS - 1)
{
__scroll();
}
else
{
console_row++;
}
return;
}
console__putentryat(c, console_color, console_column, console_row);
if ( ++console_column == VGA_NUMCOLS )
{
console_column = 0;
if (console_row == VGA_NUMROWS - 1)
{
__scroll();
}
else
{
console_row++;
}
}
}
void console__write(const char* data)
{
size_t datalen = strlen(data);
for ( size_t i = 0; i < datalen; i++ )
console__putchar(data[i]);
}
void console__printf(const char *fmt, ...)
{
va_list args;
char buf[MAXDIGITS + 2];
bool is_long;
va_start(args, fmt);
// <TODO> START TO BE ATOMIC </TODO>
while (*fmt != '\0') {
switch (*fmt) {
case '%':
if (!*++fmt) goto done;
if (*fmt == 'l') {
is_long = true;
if (!*++fmt) goto done;
} else if (*fmt == 'p') {
is_long = true;
} else {
is_long = false;
}
switch (*fmt) {
case 'd':
__ltoa(buf, is_long ? va_arg(args, long) : va_arg(args, int));
console__write(buf);
break;
case 'u':
__ultoa(buf, is_long ? va_arg(args, unsigned long) : va_arg(args, unsigned));
console__write(buf);
break;
case 'x':
case 'p':
__ltox(buf, is_long ? va_arg(args, long) : va_arg(args, int));
console__write(buf);
break;
case 'c':
console__putchar(va_arg(args, int) & 0xFF);
break;
case 's':
console__write(va_arg(args, const char *));
break;
default:
console__putchar(*fmt);
break;
}
break;
default:
console__putchar(*fmt);
break;
}
++fmt;
}
done:
// <TODO> STOP TO BE ATOMIC </TODO>
va_end(args);
}