Merge pull request #25 from E-Almqvist/dev

Makefile & File structure refactor

Makefile

@@ -1,3 +1,7 @@
+C_SOURCES = $(wildcard kernel/*.c drivers/*.c)
+HEADERS = $(wildcard kernel/*.h drivers/*.h)
+OBJ = $(C_SOURCES:.c=.o)
+
 all: os-image
 
 run: all
@@ -8,29 +12,27 @@ drun: clean run
 grub: eOS.iso
 	qemu-system-x86_64 eOS.iso
 
-eOS.iso : kernel.bin src/grub/grub.cfg
+eOS.iso : kernel/kernel.bin grub/grub.cfg
 	mkdir -p boot/grub
 	cp $< boot/eOS.bin
-	cp src/grub/grub.cfg boot/grub/grub.cfg
+	cp grub/grub.cfg boot/grub/grub.cfg
 	grub-mkrescue -o eOS.iso ./
 
-os-image: bootloader.bin kernel.bin
+os-image: bootloader/bootloader.bin kernel.bin
 	cat $^ > os-image
 
-kernel.bin: kernel_entry.o kernel.o
-	gcc -o kernel.bin $^ -Wl,--oformat=binary -ffreestanding -nostdlib -shared -Ttext 0x1000 -m32
+kernel.bin: kernel/kernel_entry.o $(OBJ) 
+	gcc -o $@ $^ -Wl,--oformat=binary -ffreestanding -nostdlib -shared -Ttext 0x1000 -m32
 
-kernel.o : src/kernel/kernel.c
+%.o : %.c
 	gcc -fno-pie -m32 -Os -ffreestanding -c $< -o $@
 
-kernel_entry.o : src/kernel/kernel_entry.asm
+%.o : %.asm
 	nasm $< -f elf -o $@
 
-bootloader.bin : src/bootloader/bootloader.asm
+%.bin : %.asm
 	nasm $< -f bin -o $@
 
 clean:
 	rm -fr *.bin *.dis *.o os-image *.map boot/ *.iso
-
-kernel.dis : kernel.bin
-	ndisasm -b 32 $< > $@
+	rm -fr kernel/*.o boot/*.bin drivers/*.o

TODO.md

@@ -1,3 +1,8 @@
 # TO DO 
+ - Refactor Makefile
+ - Refactor file structure
+ - Finish the book!
  - Multiboot support (for grub etc)
- - Expand os-image so there is no error 0x8b00!
+ - VGA Library (Graphics)
+ - User input (Keyboard)
+ - File system?

bootloader/bios.asm

@@ -0,0 +1,7 @@
+; 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

@@ -20,9 +20,9 @@
 
 	jmp $  ; inf loop
 
-%include "src/bootloader/equ/ascii.asm"
-%include "src/bootloader/bios.asm"
-%include "src/bootloader/pm.asm"
+%include "bootloader/equ/ascii.asm"
+%include "bootloader/bios.asm"
+%include "bootloader/pm.asm"
 
 BEGIN_PM:
 	; Inform of mode switch

bootloader/pm.asm

@@ -1,9 +1,9 @@
 ; Utils
-%include "src/bootloader/equ/vga.asm" 
-%include "src/bootloader/pm/vga/print.asm" 
+%include "bootloader/equ/vga.asm" 
+%include "bootloader/pm/vga/print.asm" 
 
 ; GDT & switching to PM
-%include "src/bootloader/pm/gdt.asm" 	; GDT defined here
+%include "bootloader/pm/gdt.asm" 	; GDT defined here
 
 ; Switching to PM
 [bits 16]

drivers/vga.c

@@ -1,4 +1,5 @@
 // VGA Graphics Library
+#include <sys/io.h>
 
 // VGA base address: 0xb8000
 // Charpos = 0xb8000 + 2(row*80 + col)
@@ -34,6 +35,11 @@ void clear_screen() {
 		*c = 0x20;
 }
 
+void disable_cursor() {
+	outb(0x3d4, 0x0a);
+	outb(0x3d5, 0x20);
+}
+
 
 /*
 	General Printing Functions
@@ -52,3 +58,10 @@ void println(char* str, int colorcode) {
 	print(str, colorcode);
 	cursor_row++; // Increment to next y-pos (newline)
 }
+
+
+// VGA Initialization Function
+void vga_init() {
+	disable_cursor();
+	clear_screen();
+}

kernel/kernel.c

@@ -0,0 +1,7 @@
+void main() {
+	vga_init(); 	// Initialize the screen first
+			// i.e. clear the screen et cetera.
+
+	set_cursor_pos(28, 2);
+	print("eOS Version 0.1 2021", 0xf0);
+}

src/bootloader/bios.asm

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

src/kernel/kernel.c

@@ -1,7 +0,0 @@
-#include "lib/vga.c"
-
-void main() {
-	clear_screen();
-	set_cursor_pos(28, 2);
-	print("eOS Version 0.1 2021", 0xf0);
-}

src/kernel/lib/string.c

@@ -1,8 +0,0 @@
-// Generic String Library
-#define INDEX(s, c) (int)(c-s) 
-
-unsigned int length(char* str) {
-	char* p;
-	for( p = str; *p != '\0'; p++ ) {}
-	return (unsigned int)(p-str);
-}