Merge pull request #34 from E-Almqvist/dev

Refactor & cleanup

Makefile

@@ -12,7 +12,7 @@ drun: clean run
 grub: eOS.iso
 	qemu-system-x86_64 eOS.iso
 
-eOS.iso : kernel/kernel.bin grub/grub.cfg
+eOS.iso : kernel.bin grub/grub.cfg
 	mkdir -p boot/grub
 	cp $< boot/eOS.bin
 	cp grub/grub.cfg boot/grub/grub.cfg
@@ -35,4 +35,4 @@ kernel.bin: kernel/kernel_entry.o $(OBJ)
 
 clean:
 	rm -fr *.bin *.dis *.o os-image *.map boot/ *.iso
-	rm -fr kernel/*.o boot/*.bin drivers/*.o
+	rm -fr kernel/*.o bootloader/*.bin drivers/*.o

README.md

@@ -7,7 +7,7 @@ Use the `Makefile` in order to build the binaries/objects et cetera- with <a hre
 <br>
 **To build the OS image run**: `$ make os-image`
 <br>
-**To build the OS image (WITH GRUB) run**: `$ make grub`
+**To build the OS image (WITH GRUB) run**: `$ make eOS.iso`
 #### Emulation
 You can launch eOS with a VM like <a href="https://www.qemu.org/documentation/" target="_blank">qemu</a>. Launch *qemu* via *make* by running: `$ make run`.
 

bootloader/bios.asm

@@ -1,7 +0,0 @@
-; EQUs
-%include "bootloader/equ/bios.asm"
-
-; SRs
-%include "bootloader/bios/convert.asm"
-%include "bootloader/bios/print.asm"
-%include "bootloader/bios/disk.asm"

bootloader/bootloader.asm

@@ -21,8 +21,49 @@
 	jmp $  ; inf loop
 
 %include "bootloader/equ/ascii.asm"
-%include "bootloader/bios.asm"
-%include "bootloader/pm.asm"
+%include "bootloader/equ/bios.asm"
+
+; BIOS SRs
+%include "bootloader/bios/convert.asm"
+%include "bootloader/bios/print.asm"
+%include "bootloader/bios/disk.asm"
+
+; Protected Mode SRs 
+%include "bootloader/equ/vga.asm"
+%include "bootloader/pm/vga/print.asm"
+
+; GDT & switching to PM
+%include "bootloader/pm/gdt.asm" 	; GDT defined here
+
+; Switching to PM
+[bits 16]
+pm_preinit:
+	cli			; Switch interupts
+
+	lgdt [gdt_descriptor] 	; Tell the CPU about the GDT
+
+	mov eax, cr0		; Set first bit of the CR0 register
+	or eax, 0x1		; to 1
+	mov cr0, eax		; Update the control register
+
+	; Initialize PM
+	jmp GDT_CODE_SEG:pm_init	
+
+[bits 32]
+; Init registers & stack when in PM
+pm_init:
+	mov ax, GDT_DATA_SEG	; Point the segment registers to GDT_DATA_SEG
+	; Segment registers
+	mov ds, ax
+	mov ss, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+
+	mov ebp, 0x900000	; Update the stack pointer
+	mov esp, ebp
+
+	call BEGIN_PM
 
 BEGIN_PM:
 	; Inform of mode switch

bootloader/pm.asm

@@ -1,37 +0,0 @@
-; Utils
-%include "bootloader/equ/vga.asm" 
-%include "bootloader/pm/vga/print.asm" 
-
-; GDT & switching to PM
-%include "bootloader/pm/gdt.asm" 	; GDT defined here
-
-; Switching to PM
-[bits 16]
-pm_preinit:
-	cli			; Switch interupts
-
-	lgdt [gdt_descriptor] 	; Tell the CPU about the GDT
-
-	mov eax, cr0		; Set first bit of the CR0 register
-	or eax, 0x1		; to 1
-	mov cr0, eax		; Update the control register
-
-	; Initialize PM
-	jmp GDT_CODE_SEG:pm_init	
-
-[bits 32]
-; Init registers & stack when in PM
-pm_init:
-	mov ax, GDT_DATA_SEG	; Point the segment registers to GDT_DATA_SEG
-	; Segment registers
-	mov ds, ax
-	mov ss, ax
-	mov es, ax
-	mov fs, ax
-	mov gs, ax
-
-	mov ebp, 0x900000	; Update the stack pointer
-	mov esp, ebp
-
-	call BEGIN_PM
-