gbowne1/ClassicOS
2
2
Fork 0
mirror of https://github.com/gbowne1/ClassicOS.git synced 2025-10-13 21:25:07 -07:00
Code Issues 2 Packages Projects 1 Releases Wiki Activity

adding and fixing some missing things and some undefined

Browse Source
This commit is contained in:
Gregory Kenneth Bowne
2025-05-13 10:44:10 -07:00
parent ecfa54e225
commit 10b8fdc33f
33 changed files with 267 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
kernel/terminal.c
View File

@@ -1,5 +1,6 @@
#include <stdint.h>
#include "io.h"
#include "terminal.h"
#define VGA_ADDRESS 0xB8000
#define VGA_WIDTH 80
@@ -9,6 +10,7 @@
static uint16_t* const vga_buffer = (uint16_t*) VGA_ADDRESS;
static uint8_t cursor_x = 0;
static uint8_t cursor_y = 0;
static uint8_t current_color = WHITE_ON_BLACK;
static uint16_t vga_entry(char c, uint8_t color) {
return (uint16_t) color << 8 | (uint8_t) c;
@@ -18,20 +20,35 @@ void terminal_initialize(void) {
for (uint16_t y = 0; y < VGA_HEIGHT; y++) {
for (uint16_t x = 0; x < VGA_WIDTH; x++) {
const size_t index = y * VGA_WIDTH + x;
vga_buffer[index] = vga_entry(' ', WHITE_ON_BLACK);
vga_buffer[index] = vga_entry(' ', current_color);
}
}
cursor_x = 0;
cursor_y = 0;
update_cursor(); // Optional: good idea to reset position
}
void terminal_putchar(char c) {
// Handle backspace
if (c == '\b') {
if (cursor_x > 0) {
cursor_x--;
} else if (cursor_y > 0) {
cursor_y--;
cursor_x = VGA_WIDTH - 1;
}
vga_buffer[cursor_y * VGA_WIDTH + cursor_x] = vga_entry(' ', current_color);
update_cursor(); // Optional, if you add cursor updating
return;
}
// Handle newline
if (c == '\n') {
cursor_x = 0;
cursor_y++;
} else {
const size_t index = cursor_y * VGA_WIDTH + cursor_x;
vga_buffer[index] = vga_entry(c, WHITE_ON_BLACK);
vga_buffer[index] = vga_entry(c, current_color);
cursor_x++;
if (cursor_x >= VGA_WIDTH) {
cursor_x = 0;
@@ -49,15 +66,44 @@ void terminal_putchar(char c) {
// Clear the last line
for (uint16_t x = 0; x < VGA_WIDTH; x++) {
vga_buffer[(VGA_HEIGHT - 1) * VGA_WIDTH + x] = vga_entry(' ', WHITE_ON_BLACK);
vga_buffer[(VGA_HEIGHT - 1) * VGA_WIDTH + x] = vga_entry(' ', current_color);
}
cursor_y = VGA_HEIGHT - 1;
}
update_cursor(); // Optional, if you want the hardware cursor to follow
}
void terminal_write(const char* str) {
for (size_t i = 0; str[i] != '\0'; i++) {
terminal_putchar(str[i]);
}
}
void terminal_setcolor(uint8_t color)
{
current_color = color;
}
void terminal_clear(void) {
for (uint16_t y = 0; y < VGA_HEIGHT; y++) {
for (uint16_t x = 0; x < VGA_WIDTH; x++) {
const size_t index = y * VGA_WIDTH + x;
vga_buffer[index] = vga_entry(' ', current_color);
}
}
cursor_x = 0;
cursor_y = 0;
update_cursor();
}
static void update_cursor() {
uint16_t pos = cursor_y * VGA_WIDTH + cursor_x;
outb(0x3D4, 0x0F);
outb(0x3D5, (uint8_t)(pos & 0xFF));
outb(0x3D4, 0x0E);
outb(0x3D5, (uint8_t)((pos >> 8) & 0xFF));
}