Fix syntax for some code blocks

Chapter-3/README.md

@@ -37,7 +37,7 @@ This boot process also initializes some of our C++ runtime, it will be described
 
 Multiboot header structure:
 
-```
+```cpp
 struct multiboot_info {
 	u32 flags;
 	u32 low_mem;
@@ -82,7 +82,7 @@ qemu-img create c.img 2M
 
 We need now to partition the disk using fdisk:
 
-```
+```bash
 fdisk ./c.img
 
 # Switch to Expert commands
@@ -132,27 +132,27 @@ We need now to attach the created partition to the loop-device (which allows a f
 
 Using ```fdisk -l -u c.img```, you get: 63 * 512 = 32256.
 
-```
+```bash
 losetup -o 32256 /dev/loop1 ./c.img
 ```
 
 We create a EXT2 filesystem on this new device using:
 
-```
+```bash
 mke2fs /dev/loop1
 ```
 
 We copy our files on a mounted disk:
 
-```
+```bash
 mount  /dev/loop1 /mnt/
 cp -R bootdisk/* /mnt/
 umount /mnt/
 ```
 
 Install GRUB on the disk:
 
-```
+```bash
 grub --device-map=/dev/null << EOF
 device (hd0) ./c.img
 geometry (hd0) 4 16 63
@@ -164,7 +164,7 @@ EOF
 
 And finally we detach the loop device:
 
-```
+```bash
 losetup -d /dev/loop1
 ```
 

Chapter-5/README.md

@@ -21,22 +21,22 @@ void Io::putc(char c){
 	unsigned char *video;
 	video = (unsigned char *) (real_screen+ 2 * x + 160 * y);
 	// newline
-	if (c == '\n') {			
+	if (c == '\n') {
 		x = 0;
 		y++;
 	// back space
-	} else if (c == '\b') {	
+	} else if (c == '\b') {
 		if (x) {
 			*(video + 1) = 0x0;
 			x--;
 		}
 	// horizontal tab
-	} else if (c == '\t') {	
+	} else if (c == '\t') {
 		x = x + 8 - (x % 8);
 	// carriage return
-	} else if (c == '\r') {	
+	} else if (c == '\r') {
 		x = 0;
-	} else {		
+	} else {
 		*video = c;
 		*(video + 1) = kattr;
 
@@ -144,7 +144,7 @@ void Io::print(const char *s, ...){
 				print("0x%s", buf);
 			} else if (c == 's') {
 				print((char *) va_arg(ap, int));
-			} 
+			}
 		} else
 			putc(c);
 	}

Chapter-7/README.md

@@ -55,21 +55,21 @@ Here is a table of common interrupts (Maskable hardware interrupt are called IRQ
 
 | IRQ   |         Description        |
 |:-----:| -------------------------- |
-| 0 | Programmable Interrupt Timer Interrupt | 
-| 1 | Keyboard Interrupt | 
-| 2 | Cascade (used internally by the two PICs. never raised) | 
-| 3 | COM2 (if enabled) | 
-| 4 | COM1 (if enabled) | 
-| 5 | LPT2 (if enabled) | 
-| 6 | Floppy Disk | 
-| 7 | LPT1 | 
-| 8 | CMOS real-time clock (if enabled) | 
-| 9 | Free for peripherals / legacy SCSI / NIC | 
-| 10 | Free for peripherals / SCSI / NIC | 
-| 11 | Free for peripherals / SCSI / NIC | 
-| 12 | PS2 Mouse | 
-| 13 | FPU / Coprocessor / Inter-processor | 
-| 14 | Primary ATA Hard Disk | 
+| 0 | Programmable Interrupt Timer Interrupt |
+| 1 | Keyboard Interrupt |
+| 2 | Cascade (used internally by the two PICs. never raised) |
+| 3 | COM2 (if enabled) |
+| 4 | COM1 (if enabled) |
+| 5 | LPT2 (if enabled) |
+| 6 | Floppy Disk |
+| 7 | LPT1 |
+| 8 | CMOS real-time clock (if enabled) |
+| 9 | Free for peripherals / legacy SCSI / NIC |
+| 10 | Free for peripherals / SCSI / NIC |
+| 11 | Free for peripherals / SCSI / NIC |
+| 12 | PS2 Mouse |
+| 13 | FPU / Coprocessor / Inter-processor |
+| 14 | Primary ATA Hard Disk |
 | 15 | Secondary ATA Hard Disk |
 
 #### How to initialize the interrupts?
@@ -101,23 +101,23 @@ void init_idt(void)
 {
 	/* Init irq */
 	int i;
-	for (i = 0; i < IDTSIZE; i++) 
-		init_idt_desc(0x08, (u32)_asm_schedule, INTGATE, &kidt[i]); // 
-	
+	for (i = 0; i < IDTSIZE; i++)
+		init_idt_desc(0x08, (u32)_asm_schedule, INTGATE, &kidt[i]); //
+
 	/* Vectors  0 -> 31 are for exceptions */
 	init_idt_desc(0x08, (u32) _asm_exc_GP, INTGATE, &kidt[13]);		/* #GP */
 	init_idt_desc(0x08, (u32) _asm_exc_PF, INTGATE, &kidt[14]);     /* #PF */
-	
+
 	init_idt_desc(0x08, (u32) _asm_schedule, INTGATE, &kidt[32]);
 	init_idt_desc(0x08, (u32) _asm_int_1, INTGATE, &kidt[33]);
-	
+
 	init_idt_desc(0x08, (u32) _asm_syscalls, TRAPGATE, &kidt[48]);
 	init_idt_desc(0x08, (u32) _asm_syscalls, TRAPGATE, &kidt[128]); //48
-	
+
 	kidtr.limite = IDTSIZE * 8;
 	kidtr.base = IDTBASE;
-	
-	
+
+
 	/* Copy the IDT to the memory */
 	memcpy((char *) kidtr.base, (char *) kidt, kidtr.limite);
 
@@ -175,7 +175,7 @@ The registries have to be configured in order.
 
 **ICW2 (port 0x21 / port 0xA1)**
 ```
-|x|x|x|x|x|0|0|0|  
+|x|x|x|x|x|0|0|0|
  | | | | |
  +----------------- base address for interrupts vectors
 ```
@@ -212,13 +212,13 @@ It is used to define in which mode the controller should work.
 
 You should have noticed that when I'm initializing our IDT segments, I'm using offsets to segment the code in Assembly. The different functions are defined in [x86int.asm](https://github.com/SamyPesse/How-to-Make-a-Computer-Operating-System/blob/master/src/kernel/arch/x86/x86int.asm) and are of the following scheme:
 
-```
+```asm
 %macro	SAVE_REGS 0
-	pushad 
+	pushad
 	push ds
 	push es
 	push fs
-	push gs 
+	push gs
 	push ebx
 	mov bx,0x10
 	mov ds,bx