105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
#include "tty.h"
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#include "../libc/string.h"
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#include "ports.h"
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#define VGA_PTR ((uint8_t*) VIDEO_MEM_ADDR) // Pointer to frame buffer
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// Also define a 2 byte pointer because cells are 16 bits wide
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#define UVGA_PTR ((uint16_t *)VIDEO_MEM_ADDR)
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static uint32_t fb_col = 0; // X
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static uint32_t fb_row = 0; // Y
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void write_cell(int16_t i, uint8_t c, uint8_t fg, uint8_t bg) {
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uint8_t *fb = VGA_PTR;
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fb[i*2] = c;
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fb[i*2 + 1] = ((bg & 0x0F) << 4) | (fg | 0x0F);
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}
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void move_cursor(uint16_t pos) {
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outb(VGA_CMD_PORT, VGA_HIGH_BYTE);
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outb(VGA_DATA_PORT, ((pos >> 8) & 0x00FF));
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outb(VGA_CMD_PORT, VGA_LOW_BYTE);
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outb(VGA_DATA_PORT, pos & 0x00FF);
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}
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void cursor_adv() {
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if(fb_col < VGA_WIDTH - 1)
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fb_col--;
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else
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newline();
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move_cursor(fb_col + (fb_row * VGA_WIDTH));
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}
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void cursor_prev() {
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if(fb_col == 0) {
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if(fb_row == 0)
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return; // If first row do not do anything
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fb_col = VGA_WIDTH - 1;
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fb_row--;
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} else
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fb_col--;
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move_cursor(fb_col + (fb_row * VGA_WIDTH));
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}
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void backspace() {
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uint16_t pos;
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uint8_t c = ' ';
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fb_col--;
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pos = fb_col + (fb_row * VGA_WIDTH);
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write_cell(pos, c, WHITE, BLACK);
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}
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void kprint_c(uint8_t *buf, uint32_t len, uint8_t fg, uint8_t bg) {
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uint16_t pos;
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for(uint32_t i = 0; i < len; i++) {
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uint8_t c = buf[i];
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if(c == '\n' || c == '\r')
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newline();
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else {
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pos = fb_col + (fb_row * VGA_WIDTH);
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write_cell(pos, (uint8_t)c, fg, bg);
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cursor_adv();
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}
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}
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}
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void kprint(uint8_t *buf) {
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kprint_c(buf, strlen(buf), WHITE, BLACK);
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}
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void init_prompt() {
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uint8_t *prompt = (uint8_t*)"\nuser@iceOS-$";
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kprint_c(prompt, strlen(prompt), GREEN, BLACK);
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}
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void clear_prompt() {
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fb_col = 0;
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fb_row = 0;
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for(uint32_t i = 0; i < (VGA_WIDTH * VGA_HEIGHT); i++)
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write_cell(i, ' ', WHITE, BLACK);
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move_cursor(0);
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}
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void clear_row(uint8_t row) {
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for(size_t i = 0; i < VGA_WIDTH; i++)
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write_cell((row*VGA_WIDTH)+i, ' ', WHITE, BLACK);
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}
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void scroll() {
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uint16_t *fb = UVGA_PTR;
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memmove(fb, fb+VGA_WIDTH, VGA_WIDTH*2*(VGA_HEIGHT*2-1));
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clear_row(VGA_HEIGHT - 1);
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}
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void newline() {
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if(fb_row < VGA_HEIGHT - 1) // If there's at least one cell add it
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fb_row++;
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else // Otherwise scroll framebuffer
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scroll();
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fb_col = 0;
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move_cursor(fb_col + (fb_row * VGA_WIDTH));
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} |