add tty.c tty.h for terminal handling

1 files changed, 4 insertions, 103 deletions

diff --git a/kernel/kernel.c b/kernel/kernel.c
index 5054231..d65b07d 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -1,114 +1,15 @@
-#if !defined(__cplusplus)
-#include <stdbool.h> /* C doesn't have booleans by default. */
-#endif
-#include <stddef.h>
-#include <stdint.h>
-
-/* Check if the compiler thinks we are targeting the wrong operating system. */
-#if defined(__linux__)
-/* TODO how does this check for a cross compiler? It was failing. */
-/*#error "You are not using a cross-compiler, you will most certainly run into trouble"*/
-#endif
+#include "tty.h"
 
-/* This tutorial will only work for the 32-bit ix86 targets. */
+/* this only work for the 32-bit ix86 targets. */
 #if !defined(__i386__)
 #error "This tutorial needs to be compiled with a ix86-elf compiler"
 #endif
 
-/* Hardware text mode color constants. */
-enum vga_color {
-    COLOR_BLACK         = 0,
-    COLOR_BLUE          = 1,
-    COLOR_GREEN         = 2,
-    COLOR_CYAN          = 3,
-    COLOR_RED           = 4,
-    COLOR_MAGENTA       = 5,
-    COLOR_BROWN         = 6,
-    COLOR_LIGHT_GREY    = 7,
-    COLOR_DARK_GREY     = 8,
-    COLOR_LIGHT_BLUE    = 9,
-    COLOR_LIGHT_GREEN   = 10,
-    COLOR_LIGHT_CYAN    = 11,
-    COLOR_LIGHT_RED     = 12,
-    COLOR_LIGHT_MAGENTA = 13,
-    COLOR_LIGHT_BROWN   = 14,
-    COLOR_WHITE         = 15,
-};
-
-static uint8_t make_color(enum vga_color fg, enum vga_color bg)
-{
-    return fg | bg << 4;
-}
-
-static uint16_t make_vgaentry(char c, uint8_t color)
-{
-    uint16_t c16 = c;
-    uint16_t color16 = color;
-    return c16 | color16 << 8;
-}
-
-/* static size_t strlen(const char* str) */
-/* { */
-/*     size_t ret = 0; */
-/*     for (const char* p = str; *p != 0; p++, ret++); */
-/*     return ret; */
-/* } */
-
-static const size_t VGA_WIDTH = 80;
-static const size_t VGA_HEIGHT = 25;
-
-size_t terminal_row;
-size_t terminal_column;
-uint8_t terminal_color;
-uint16_t* terminal_buffer;
-
-static void terminal_initialize()
-{
-    terminal_row = 0;
-    terminal_column = 0;
-    terminal_color = make_color(COLOR_LIGHT_GREY, COLOR_BLACK);
-    terminal_buffer = (uint16_t*) 0xB8000;
-    for (size_t y = 0; y < VGA_HEIGHT; y++) {
-        for (size_t x = 0; x < VGA_WIDTH; x++) {
-            const size_t index = y * VGA_WIDTH + x;
-            terminal_buffer[index] = make_vgaentry(' ', terminal_color);
-        }
-    }
-}
-
-/* static void terminal_setcolor(uint8_t color) */
-/* { */
-/*     terminal_color = color; */
-/* } */
-
-static void terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
-{
-    const size_t index = y * VGA_WIDTH + x;
-    terminal_buffer[index] = make_vgaentry(c, color);
-}
-
-static void terminal_putchar(char c)
-{
-    terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
-    if (++terminal_column == VGA_WIDTH) {
-        terminal_column = 0;
-        if (++terminal_row == VGA_HEIGHT) {
-            terminal_row = 0;
-        }
-    }
-}
-
-static void terminal_writestring(const char* data)
-{
-    for (const char* p = data; *p != 0; p++)
-        terminal_putchar(*p);
-}
-
 #if defined(__cplusplus)
 extern "C" /* Use C linkage for kernel_main. */
 #endif
 void kernel_main()
 {
-    terminal_initialize();
-    terminal_writestring("Hello, kernel World!\n");
+    tty_init();
+    tty_writestring("Hello, kernel World!\n");
 }