banan-os/kernel/arch/i386/tty.cpp

155 lines
2.9 KiB
C++

#include <kernel/IO.h>
#include <kernel/multiboot.h>
#include <kernel/panic.h>
#include <kernel/tty.h>
#include "vga.h"
#include <stdint.h>
#include <string.h>
namespace TTY
{
static size_t VGA_WIDTH;
static size_t VGA_HEIGHT;
static uint16_t* VGA_MEMORY;
static size_t terminal_row;
static size_t terminal_col;
static uint8_t terminal_color;
static uint16_t* terminal_buffer;
void putentryat(unsigned char c, uint8_t color, size_t x, size_t y)
{
const size_t index = y * VGA_WIDTH + x;
terminal_buffer[index] = vga_entry(c, color);
}
void clear()
{
for (size_t y = 0; y < VGA_HEIGHT; y++)
for (size_t x = 0; x < VGA_WIDTH; x++)
putentryat(' ', terminal_color, x, y);
}
void initialize()
{
if (s_multiboot_info->flags & (1 << 12))
{
const framebuffer_info_t& fb = s_multiboot_info->framebuffer;
VGA_WIDTH = fb.width;
VGA_HEIGHT = fb.height;
VGA_MEMORY = (uint16_t*)fb.addr;
}
else
{
VGA_WIDTH = 80;
VGA_HEIGHT = 25;
VGA_MEMORY = (uint16_t*)0xB8000;
}
terminal_row = 0;
terminal_col = 0;
terminal_color = vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
terminal_buffer = VGA_MEMORY;
clear();
if (s_multiboot_info->flags & (1 << 12))
if (s_multiboot_info->framebuffer.type != 2)
Kernel::panic("Invalid framebuffer_type in multiboot info");
}
void setcolor(uint8_t color)
{
terminal_color = color;
}
void scroll_line(size_t line)
{
for (size_t x = 0; x < VGA_WIDTH; x++)
{
const size_t index = line * VGA_WIDTH + x;
terminal_buffer[index - VGA_WIDTH] = terminal_buffer[index];
}
}
void clear_line(size_t line)
{
for (size_t x = 0; x < VGA_WIDTH; x++)
putentryat(' ', terminal_color, x, line);
}
static void update_cursor()
{
uint16_t pos = terminal_row * VGA_WIDTH + terminal_col;
IO::outb(0x3D4, 0x0F);
IO::outb(0x3D5, (uint8_t) (pos & 0xFF));
IO::outb(0x3D4, 0x0E);
IO::outb(0x3D5, (uint8_t) ((pos >> 8) & 0xFF));
}
void set_cursor_pos(int x, int y)
{
terminal_row = y;
terminal_col = x;
update_cursor();
}
void putchar(char c)
{
if (c == '\t')
c = ' ';
if (c == '\n')
{
terminal_col = 0;
terminal_row++;
}
else if (c == '\b')
{
if (terminal_col > 0)
terminal_col--;
putentryat(' ', terminal_color, terminal_col, terminal_row);
}
else
{
putentryat(c, terminal_color, terminal_col, terminal_row);
terminal_col++;
}
if (terminal_col == VGA_WIDTH)
{
terminal_col = 0;
terminal_row++;
}
if (terminal_row == VGA_HEIGHT)
{
for (size_t line = 1; line < VGA_HEIGHT; line++)
scroll_line(line);
clear_line(VGA_HEIGHT - 1);
terminal_col = 0;
terminal_row = VGA_HEIGHT - 1;
}
update_cursor();
}
void write(const char* data, size_t size)
{
for (size_t i = 0; i < size; i++)
putchar(data[i]);
}
void writestring(const char* data)
{
while (*data)
{
putchar(*data);
data++;
}
}
}