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