88 lines
2.2 KiB
C
Executable File
88 lines
2.2 KiB
C
Executable File
#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <kernel/tty.h>
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#include <kernel/utils.h>
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static const size_t TERM_WIDTH=80;
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static const size_t TERM_HEIGHT=25;
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static size_t terminal_row;
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static size_t terminal_column;
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static uint8_t current_color;
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static uint16_t* term_buffer;
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static uint16_t* const vga_buffer = (uint16_t*) 0xB8000;
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void screen_initialize(void) {
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terminal_row = 0;
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terminal_column = 0;
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current_color = vga_color_set(LIGHT_GREY, BLACK);
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term_buffer = vga_buffer;
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for (size_t y = 0; y < TERM_HEIGHT; y++) {
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for(size_t x = 0; x < TERM_WIDTH; x++) {
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const size_t offset = y * TERM_WIDTH + x;
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term_buffer[offset] = vga_entry(' ', current_color);
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}
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}
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}
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void term_setcolor(enum vga_colors color) {
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current_color = color;
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}
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void term_putentryat (char c, uint8_t color, size_t x, size_t y) {
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const size_t offset = y * TERM_WIDTH + x;
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term_buffer[offset] = vga_entry(c, color);
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}
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void term_putchar(char c) {
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unsigned char uc = c;
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term_putentryat(uc, current_color, terminal_column, terminal_row);
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if(++terminal_column == TERM_WIDTH)
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{
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terminal_column = 0;
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if(++terminal_row == TERM_HEIGHT){
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term_scroll();
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terminal_row = 0;
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}
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}
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}
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void term_write(const char* data, size_t size) {
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for(size_t i = 0; i < size; i++)
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term_putchar(data[i]);
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}
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void puts(const char* string) {
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term_write(string, strlen(string));
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term_putchar('\n');
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}
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void term_scroll() {
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int current_pos = 160; //Start of the second line.
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unsigned char* term_buffer = (unsigned char*) vga_buffer;
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while (current_pos <= 4000) {
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term_buffer[current_pos - 160 /*The character immediately below it*/] = vga_buffer[current_pos]; //Move each character up a line
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term_buffer[current_pos - 159 /*The color of the character below*/] = vga_buffer[current_pos + 1]; //As well as its color
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current_pos += 2; //Move to next char
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}
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current_pos = 3840; //Start of the last line
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int i; //Offset for framebuffer
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//Wipe out the bottom line
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for(i = 1920; i <= 2000; i++) {
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term_buffer[current_pos] = 0;
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current_pos += 2;
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}
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i = 3840;
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terminal_row = 24; //Prepare the screen to scroll
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} |