added kernal files

boot.s

@@ -0,0 +1,51 @@
+# set magic number to 0x1BADB002 to identified by bootloader 
+.set MAGIC,    0x1BADB002
+
+# set flags to 0
+.set FLAGS,    0
+
+# set the checksum
+.set CHECKSUM, -(MAGIC + FLAGS)
+
+# set multiboot enabled
+.section .multiboot
+
+# define type to long for each data defined as above
+.long MAGIC
+.long FLAGS
+.long CHECKSUM
+
+
+# set the stack bottom 
+stackBottom:
+
+# define the maximum size of stack to 512 bytes
+.skip 1024
+
+
+# set the stack top which grows from higher to lower
+stackTop:
+
+.section .text
+.global _start
+.type _start, @function
+
+
+_start:
+
+  # assign current stack pointer location to stackTop
+	mov $stackTop, %esp
+
+  # call the kernel main source
+	call kernel_entry
+
+	cli
+
+
+# put system in infinite loop
+hltLoop:
+
+	hlt
+	jmp hltLoop
+
+.size _start, . - _start

grub.cfg

@@ -0,0 +1,3 @@
+    menuentry "Ritik" {  
+        multiboot /boot/MyOS.bin  
+    }  

kernel.c

@@ -0,0 +1,24 @@
+    #include"kernel.h"  
+
+    static UINT16 VGA_DefaultEntry(unsigned char to_print) {  
+        return (UINT16) to_print | (UINT16)WHITE_COLOR << 8;  
+    }  
+
+    void KERNEL_MAIN()  
+    {  
+      TERMINAL_BUFFER = (UINT16*) VGA_ADDRESS;  
+
+      TERMINAL_BUFFER[0] = VGA_DefaultEntry('R');  
+      TERMINAL_BUFFER[1] = VGA_DefaultEntry('i');  
+      TERMINAL_BUFFER[2] = VGA_DefaultEntry('t');  
+      TERMINAL_BUFFER[3] = VGA_DefaultEntry('i');  
+      TERMINAL_BUFFER[4] = VGA_DefaultEntry('k');  
+      TERMINAL_BUFFER[5] = VGA_DefaultEntry(' ');  
+      TERMINAL_BUFFER[6] = VGA_DefaultEntry('K');  
+      TERMINAL_BUFFER[7] = VGA_DefaultEntry('e');  
+      TERMINAL_BUFFER[8] = VGA_DefaultEntry('r');  
+      TERMINAL_BUFFER[9] = VGA_DefaultEntry('n');  
+      TERMINAL_BUFFER[10] = VGA_DefaultEntry('e');
+      TERMINAL_BUFFER[11] = VGA_DefaultEntry('l');  
+    }  
+

kernel.h

@@ -0,0 +1,12 @@
+    #ifndef _KERNEL_H_  
+    #define _KERNEL_H_  
+
+    #define VGA_ADDRESS 0xB8000  
+
+    #define WHITE_COLOR 15  
+
+    typedef unsigned short UINT16;  
+
+    UINT16* TERMINAL_BUFFER;  
+
+    #endif  

linker.ld

@@ -0,0 +1,35 @@
+    /* entry point of our kernel */  
+    ENTRY(_start)  
+
+    SECTIONS  
+    {  
+        /* we need 1MB of space atleast */  
+        . = 1M;  
+
+        /* text section */  
+        .text BLOCK(4K) : ALIGN(4K)  
+        {  
+            *(.multiboot)  
+            *(.text)  
+        }  
+
+        /* read only data section */  
+        .rodata BLOCK(4K) : ALIGN(4K)  
+        {  
+            *(.rodata)  
+        }  
+
+        /* data section */  
+        .data BLOCK(4K) : ALIGN(4K)  
+        {  
+            *(.data)  
+        }  
+
+        /* bss section */  
+        .bss BLOCK(4K) : ALIGN(4K)  
+        {  
+            *(COMMON)  
+            *(.bss)  
+        }  
+
+    }  

run.sh

@@ -0,0 +1,24 @@
+
+
+    #assemble boot.s file  
+    as boot.s -o boot.o  
+
+    #compile kernel.c file  
+    gcc -c kernel.c -o kernel.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra  
+
+    #linking the kernel with kernel.o and boot.o files  
+    gcc -T linker.ld -o MyOS.bin -ffreestanding -O2 -nostdlib kernel.o boot.o -lgcc  
+
+    #check MyOS.bin file is x86 multiboot file or not  
+    grub-file --is-x86-multiboot MyOS.bin  
+
+    #building the iso file  
+    mkdir -p isodir/boot/grub  
+    cp MyOS.bin isodir/boot/MyOS.bin  
+    cp grub.cfg isodir/boot/grub/grub.cfg  
+    grub-mkrescue -o MyOS.iso isodir  
+
+    #run it in qemu  
+    qemu-system-x86_64 -cdrom SabMohMayaHai.iso  
+
+