Work for part 4

.vscode/settings.json

@@ -56,5 +56,9 @@
   "C_Cpp_Runner.showCompilationTime": false,
   "C_Cpp_Runner.useLinkTimeOptimization": false,
   "C_Cpp_Runner.msvcSecureNoWarnings": false,
-  "makefile.configureOnOpen": false
+  "makefile.configureOnOpen": false,
+  "files.associations": {
+    "portmap.h": "c",
+    "cstddef": "c"
+  }
 }

Makefile

@@ -1,4 +1,4 @@
-C_FILES=./kernel.c ./console/console.c
+C_FILES=./kernel.c ./console/console.c ./device/keyboard/keyboard.c ./device/portmap/portmap.c
 O_FILES=$(C_FILES:.c=.o)
 
 all: qemu_launch

boot.asm

@@ -78,7 +78,7 @@ begin_32bit:
 	jmp KERNEL_ADDRESS
 
 
-NUM_SECTORS db 0x09
+NUM_SECTORS db 0x1F
 DISK_SUCCESS_MESSAGE db "Read succeeded, continuing", 0
 DISK_READ_ERROR_MESSAGE db "Problem with disk read", 0
 DISK_SECTOR_ERROR_MESSAGE db "Read and requested sectors differ", 0

console/console.c

@@ -1,4 +1,6 @@
-#include "../include/console.h"
+#include "console.h"
+#include "portmap.h"
+#include <stdint.h>
 
 const int VGA_WIDTH = 80;
 const int VGA_HEIGHT = 25;
@@ -41,13 +43,19 @@ void print_character(char c) {
 
 void print_character_with_color(char c, VGA_Color bg, VGA_Color fg) {
     if (c == '\n') {
-        terminal_position = (terminal_position + (VGA_BYTES_PER_CHARACTER * VGA_WIDTH)) - (terminal_position % (VGA_BYTES_PER_CHARACTER * VGA_WIDTH));
+        terminal_position = (terminal_position + ((VGA_BYTES_PER_CHARACTER / 2 * VGA_WIDTH)) - (terminal_position % (VGA_BYTES_PER_CHARACTER / 2 * VGA_WIDTH)));
+    } else if (c == '\b') {
+        terminal_position -= 1;
+        VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER)] = ' ';
+        int full_color = (bg << 4) | fg;
+        VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER) + 1] = full_color;
     } else {
         VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER)] = c;
         int full_color = (bg << 4) | fg;
         VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER) + 1] = full_color;
         terminal_position++;
     }
+    update_cursor();
 }
 
 void print_string(char* string) {
@@ -69,4 +77,23 @@ void print_line(char* string) {
     print_string(string);
     print_character('\n');
 
+}
+
+void print_line_with_color(char* string, VGA_Color bg, VGA_Color fg) {
+    print_string_with_color(string, bg, fg);
+    print_character('\n');
+}
+
+void update_cursor() {
+
+    uint16_t cursor_position = terminal_position >> 0;
+
+    outb(0x3D4, 0x0F);
+
+    outb(0x3D5, (uint8_t) (cursor_position));
+
+    outb(0x3D4, 0x0E);
+
+    outb(0x3D5, (uint8_t) (cursor_position >> 8));
+
 }

device/keyboard/keyboard.c

@@ -0,0 +1,30 @@
+#include "portmap.h"
+#include <stdint.h>
+
+uint8_t scan(void) {
+
+    uint8_t brk;
+
+    static uint8_t key = 0;
+
+    uint8_t scan = inb(0x60);
+
+    brk = scan & 0x80;
+
+    scan = scan & 0x7f;
+
+    if (brk) {
+
+         return key = 0;
+
+    } else if (scan != key) {
+
+         return key = scan;
+
+    } else {
+
+         return 0;
+
+    }
+
+}

device/portmap/portmap.c

@@ -0,0 +1,17 @@
+#include <stdint.h>
+
+uint8_t inb(uint16_t port) {
+
+    uint8_t ret;
+
+    __asm__ __volatile__("inb %1, %0":"=a"(ret):"Nd"(port));
+
+    return ret;
+
+}
+
+void outb(uint16_t port, uint8_t val) {
+
+    __asm__ __volatile__("outb %0, %1": : "a" (val), "Nd" (port));
+
+}

include/console.h

@@ -16,6 +16,8 @@
 
     void print_line(char* str);
 
+    void update_cursor();
+
     typedef enum {
 
         BLACK=0,

include/keyboard.h

@@ -0,0 +1,23 @@
+#ifndef MYOS_INCLUDE_KEYBOARD_H
+
+    #define MYOS_INCLUDE_KEYBOARD_H
+
+    #include <stdint.h>
+
+    static const char charmap[256] =
+    {0,   0x1B, '1',  '2',  '3',  '4',  '5',  '6',
+    '7',  '8',  '9',  '0',  '-',  '=',  '\b', '\t',
+    'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',
+    'o',  'p',  '[',  ']',  '\n', 0,   'a',  's',
+    'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';',
+    '\'', '`',  0,   '\\', 'z',  'x',  'c',  'v',
+    'b',  'n',  'm',  ',',  '.',  '/',  0,   '*', 
+    0,   ' ',  0,   0,   0,   0,   0,   0,
+    0,   0,   0,   0,   0,   0,   0,   '7',
+    '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',
+    '2',  '3',  '0',  '.',  0,   0,   0,   0
+    };
+
+    uint8_t scan(void);
+
+#endif

include/portmap.h

@@ -0,0 +1,11 @@
+#ifndef MYOS_INCLUDE_PORTMAP_H
+
+    #define MYOS_INCLUDE_PORTMAP_H
+
+    #include <stdint.h>
+
+    uint8_t inb(uint16_t port);
+
+    void outb(uint16_t port, uint8_t val);
+
+#endif

kernel.c

@@ -1,11 +1,19 @@
 #include "console.h"
+#include "keyboard.h"
+#include "util.h"
+#include <stdint.h>
 
 void main() {
 
 	clear_terminal();
-	print_string("HELLO");
-	print_line("WORLD");
-	print_string("TODAY");
+	update_cursor();
+	print_line_with_color("Welcome to myOS!", RED, WHITE);
+	uint8_t byte;
+	while(1) {
+		while (byte = scan()) {
+			print_character(charmap[byte]);
+		}
+	}
 
 	return;
 }