From 4528b2347ac72ffdabdbe4d9e7bf7789c81e664f Mon Sep 17 00:00:00 2001
From: Aleksa Vučković <aleksav013@gmail.com>
Date: Tue, 12 Oct 2021 21:53:40 +0200
Subject: Adding tty

---
 src/kernel.c | 128 +++--------------------------------------------------------
 1 file changed, 6 insertions(+), 122 deletions(-)

(limited to 'src/kernel.c')

diff --git a/src/kernel.c b/src/kernel.c
index 0882580..0ad3b66 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -1,129 +1,13 @@
-#include<stdbool.h>
-#include<stddef.h>
-#include<stdint.h>
-#include"vga.h"
-
-static const size_t VGA_WIDTH = 80;
-static const size_t VGA_HEIGHT = 25;
-
-#define PIC1_COMMAND_PORT 0x20
-#define PIC1_DATA_PORT 0x21
-#define PIC2_COMMAND_PORT 0xA0
-#define PIC2_DATA_PORT 0xA1
-// IO Ports for Keyboard
-#define KEYBOARD_DATA_PORT 0x60
-#define KEYBOARD_STATUS_PORT 0x64
-
-extern char ioport_in(uint8_t port);
-extern void ioport_out(uint8_t port, char data);
-
-static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg) 
-{
-    return fg | bg << 4;
-}
- 
-static inline uint16_t vga_entry(unsigned char uc, uint8_t color) 
-{
-    return (uint16_t) uc | (uint16_t) color << 8;
-}
- 
-size_t terminal_row;
-size_t terminal_column;
-uint8_t terminal_color;
-uint16_t* terminal_buffer;
- 
-void terminal_initialize(void) 
-{
-    terminal_row=0;
-    terminal_column=0;
-    terminal_color=vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_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]=vga_entry(' ', terminal_color);
-	}
-    }
-}
- 
-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]=vga_entry(c, color);
-}
-
-void movescreen()
-{
-    terminal_row--;
-    for(size_t i=0;i<VGA_HEIGHT;i++) for(size_t j=0;j<VGA_WIDTH;j++) terminal_buffer[i*VGA_WIDTH+j]=terminal_buffer[(i+1)*VGA_WIDTH+j];
-}
- 
-void terminal_putchar(char c) 
-{
-    if(c=='\n') terminal_column = 0,terminal_row++;
-    else
-    {
-	terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
-	if (++terminal_column==VGA_WIDTH) terminal_column=0,terminal_row++;
-    }
-    if (terminal_row==VGA_HEIGHT) movescreen();
-}
- 
-void terminal_writestring(const char* data) 
-{
-    for(int i=0;data[i]!='\0';i++) terminal_putchar(data[i]);
-}
-
-void init_keyboard()
-{
-    // 0xFD = 1111 1101 in binary. enables only IRQ1
-    // Why IRQ1? Remember, IRQ0 exists, it's 0-based
-    ioport_out(PIC1_DATA_PORT, 0xFD);
-}
-
-#include"keyboard.h"
-void handle_keyboard_interrupt()
-{
-    // Write end of interrupt (EOI)
-    ioport_out(PIC1_COMMAND_PORT, 0x20);
-    unsigned char status = ioport_in(KEYBOARD_STATUS_PORT);
-
-    // Lowest bit of status will be set if buffer not empty
-    // (thanks mkeykernel)
-    if (status & 0x1)
-    {
-	char keycode = ioport_in(KEYBOARD_DATA_PORT);
-	if (keycode < 0 || (uint8_t)keycode >= 128) return;
-
-	if(keycode==14)
-	{
-	    if(terminal_column) terminal_column--;
-	    terminal_putchar(keyboard[keycode]);
-	    terminal_column--;
-	    return;
-	}
-
-	terminal_putchar(keyboard[keycode]);
-
-    }
-}
-void print_message()
-{
-    for(size_t i=0;i<50;i++)
-    {
-       for(size_t j=0;j<i;j++) terminal_writestring("#");
-       terminal_writestring("Hello, kernel World!\n");
-    }
-}
+void terminal_initialize(void);
+void init_idt_table(void);
+void init_keyboard(void);
+void prompt(void);
 
 void kernel_main(void)
 {
     terminal_initialize();
-    print_message();
     init_idt_table();
     init_keyboard();
-    terminal_writestring("First part is working\n");
-    while(1);
+    prompt();
+    while(1) __asm__("hlt\n\t");
 }
-- 
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