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

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#include <kernel/IO.h>
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#include <kernel/multiboot.h>
#include <kernel/panic.h>
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#include <kernel/Serial.h>
#include <kernel/tty.h>
#include "vga.h"
#include <stdint.h>
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#include <string.h>
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#define BEL 0x07
#define BS 0x08
#define HT 0x09
#define LF 0x0A
#define FF 0x0C
#define CR 0x0D
#define ESC 0x1B
#define CSI '['
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;
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static char s_ansi_escape_mode = '\0';
static int s_ansi_escape_index = 0;
static int s_ansi_escape_nums[2] = { -1, -1 };
inline constexpr int max(int a, int b) { return a > b ? a : b; }
inline constexpr int min(int a, int b) { return a < b ? a : b; }
inline constexpr int clamp(int x, int a, int b) { return x < a ? a : x > b ? b : x; }
void putentryat(unsigned char c, uint8_t color, size_t x, size_t y)
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{
const size_t index = y * VGA_WIDTH + x;
terminal_buffer[index] = vga_entry(c, color);
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}
void clear()
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{
for (size_t y = 0; y < VGA_HEIGHT; y++)
for (size_t x = 0; x < VGA_WIDTH; x++)
putentryat(' ', terminal_color, x, y);
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}
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");
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for (int i = 0; i < 16; i++)
{
terminal_color = vga_entry_color((vga_color)i, VGA_COLOR_BLACK);
putchar('#');
}
putchar('\n');
}
void setcolor(uint8_t color)
{
terminal_color = color;
}
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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)
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{
for (size_t x = 0; x < VGA_WIDTH; x++)
putentryat(' ', terminal_color, x, line);
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}
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();
}
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static void reset_ansi_escape()
{
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s_ansi_escape_mode = '\0';
s_ansi_escape_index = 0;
s_ansi_escape_nums[0] = -1;
s_ansi_escape_nums[1] = -1;
}
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static void handle_ansi_SGR()
{
switch (s_ansi_escape_nums[0])
{
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case -1: case 0:
terminal_color = vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
break;
case 30:
terminal_color = vga_set_foreground(VGA_COLOR_BLACK, terminal_color);
break;
case 31:
terminal_color = vga_set_foreground(VGA_COLOR_RED, terminal_color);
break;
case 32:
terminal_color = vga_set_foreground(VGA_COLOR_GREEN, terminal_color);
break;
case 33:
terminal_color = vga_set_foreground(VGA_COLOR_LIGHT_BROWN, terminal_color);
break;
case 34:
terminal_color = vga_set_foreground(VGA_COLOR_BLUE, terminal_color);
break;
case 35:
terminal_color = vga_set_foreground(VGA_COLOR_MAGENTA, terminal_color);
break;
case 36:
terminal_color = vga_set_foreground(VGA_COLOR_CYAN, terminal_color);
break;
case 37:
terminal_color = vga_set_foreground(VGA_COLOR_DARK_GREY, terminal_color);
break;
case 40:
terminal_color = vga_set_background(VGA_COLOR_BLACK, terminal_color);
break;
case 41:
terminal_color = vga_set_background(VGA_COLOR_RED, terminal_color);
break;
case 42:
terminal_color = vga_set_background(VGA_COLOR_GREEN, terminal_color);
break;
case 43:
terminal_color = vga_set_background(VGA_COLOR_LIGHT_BROWN, terminal_color);
break;
case 44:
terminal_color = vga_set_background(VGA_COLOR_BLUE, terminal_color);
break;
case 45:
terminal_color = vga_set_background(VGA_COLOR_MAGENTA, terminal_color);
break;
case 46:
terminal_color = vga_set_background(VGA_COLOR_CYAN, terminal_color);
break;
case 47:
terminal_color = vga_set_background(VGA_COLOR_DARK_GREY, terminal_color);
break;
}
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}
static void handle_ansi_escape(char c)
{
switch (s_ansi_escape_mode)
{
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case '\1':
{
if (c == CSI)
{
s_ansi_escape_mode = CSI;
return;
}
return reset_ansi_escape();
}
case CSI:
{
switch (c)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
int& val = s_ansi_escape_nums[s_ansi_escape_index];
val = (val == -1) ? (c - '0') : (val * 10 + c - '0');
return;
}
case ';':
s_ansi_escape_index++;
return;
case 'A': // Cursor Up
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
terminal_row = max(terminal_row - s_ansi_escape_nums[0], 0);
return reset_ansi_escape();
case 'B': // Curson Down
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
terminal_row = min(terminal_row + s_ansi_escape_nums[0], VGA_HEIGHT - 1);
return reset_ansi_escape();
case 'C': // Cursor Forward
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
terminal_col = min(terminal_col + s_ansi_escape_nums[0], VGA_WIDTH - 1);
return reset_ansi_escape();
case 'D': // Cursor Back
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
terminal_col = max(terminal_col - s_ansi_escape_nums[0], 0);
return reset_ansi_escape();
case 'E': // Cursor Next Line
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
terminal_row = min(terminal_row + s_ansi_escape_nums[0], VGA_HEIGHT - 1);
terminal_col = 0;
return reset_ansi_escape();
case 'F': // Cursor Previous Line
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
terminal_row = max(terminal_row - s_ansi_escape_nums[0], 0);
terminal_col = 0;
return reset_ansi_escape();
case 'G': // Cursor Horizontal Absolute
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
terminal_col = clamp(s_ansi_escape_nums[0] - 1, 0, VGA_WIDTH - 1);
return reset_ansi_escape();
case 'H': // Cursor Position
if (s_ansi_escape_nums[0] == -1)
s_ansi_escape_nums[0] = 1;
if (s_ansi_escape_nums[1] == -1)
s_ansi_escape_nums[1] = 1;
terminal_row = clamp(s_ansi_escape_nums[0] - 1, 0, VGA_HEIGHT - 1);
terminal_col = clamp(s_ansi_escape_nums[1] - 1, 0, VGA_WIDTH - 1);
return reset_ansi_escape();
case 'J': // Erase in Display
dprintln("Unsupported ANSI CSI character J");
return reset_ansi_escape();
case 'K': // Erase in Line
switch (s_ansi_escape_nums[0])
{
case -1: case 0:
for (size_t i = terminal_col; i < VGA_WIDTH; i++)
putentryat(' ', terminal_color, i, terminal_row);
break;
case 1:
for (size_t i = 0; i <= terminal_col; i++)
putentryat(' ', terminal_color, i, terminal_row);
break;
case 2:
for (size_t i = 0; i < VGA_WIDTH; i++)
putentryat(' ', terminal_color, i, terminal_row);
break;
}
return reset_ansi_escape();
case 'S': // Scroll Up
dprintln("Unsupported ANSI CSI character S");
return reset_ansi_escape();
case 'T': // Scroll Down
dprintln("Unsupported ANSI CSI character T");
return reset_ansi_escape();
case 'f': // Horizontal Vertical Position
dprintln("Unsupported ANSI CSI character f");
return reset_ansi_escape();
case 'm':
handle_ansi_SGR();
return reset_ansi_escape();
default:
dprintln("Unsupported ANSI CSI character {}", c);
return reset_ansi_escape();
}
}
default:
dprintln("Unsupported ANSI mode");
return reset_ansi_escape();
}
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}
void putchar(char c)
{
if (s_ansi_escape_mode)
return handle_ansi_escape(c);
// https://en.wikipedia.org/wiki/ANSI_escape_code
switch (c)
{
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case BEL: // TODO
break;
case BS:
if (terminal_col > 0)
terminal_col--;
break;
case HT:
terminal_col++;
while (terminal_col % 8)
terminal_col++;
break;
case LF:
terminal_col = 0;
terminal_row++;
break;
case FF:
terminal_row++;
break;
case CR:
terminal_col = 0;
break;
case ESC:
s_ansi_escape_mode = '\1';
break;
default:
putentryat(c, terminal_color, terminal_col, terminal_row);
terminal_col++;
break;
}
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if (terminal_col >= VGA_WIDTH)
{
terminal_col = 0;
terminal_row++;
}
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while (terminal_row >= VGA_HEIGHT)
{
for (size_t line = 1; line < VGA_HEIGHT; line++)
scroll_line(line);
clear_line(VGA_HEIGHT - 1);
terminal_col = 0;
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terminal_row--;
}
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++;
}
}
}