This shit is super hard to automate... trust me

Makefile

@@ -2,7 +2,7 @@ include build_scripts/config.mk
 
 .PHONY: all floppy_image kernel bootloader clean always tools_fat
 
-all: floppy_image tools_fat
+all: image
 
 include build_scripts/toolchain.mk
 # oldnum = cat version
@@ -11,17 +11,20 @@ include build_scripts/toolchain.mk
 # export newnum
 
 #
-# Floppy image
+# Image
 #
-floppy_image: $(BUILD_DIR)/main_floppy.img
+image: $(BUILD_DIR)/main.img
 
-$(BUILD_DIR)/main_floppy.img: bootloader kernel
+$(BUILD_DIR)/main.img: bootloader kernel
-	dd if=/dev/zero of=$(BUILD_DIR)/main_floppy.img bs=512 count=2880
+	dd if=/dev/zero of=$(BUILD_DIR)/main.img bs=512 count=20000
-	mkfs.fat -F 12 -n "NANITE" $(BUILD_DIR)/main_floppy.img
+	mkfs.ext2 $(BUILD_DIR)/main.img
-	mmd -i $(BUILD_DIR)/main_floppy.img "::boot"
+	e2mkdir $(BUILD_DIR)/main.img:boot
-	mmd -i $(BUILD_DIR)/main_floppy.img "::misc"
+	e2mkdir $(BUILD_DIR)/main.img:misc
-	mmd -i $(BUILD_DIR)/main_floppy.img "::misc/src"
+	e2mkdir $(BUILD_DIR)/main.img:misc/src
-	mcopy -s -i $(BUILD_DIR)/main_floppy.img src/* "::misc/src"
+	e2mkdir $(BUILD_DIR)/main.img:boot/grub
+#	e2cp -v -s src/ -d $(BUILD_DIR)/main.img:misc/src really, really, really slow...
+	e2cp grub/* $(BUILD_DIR)/main.img:boot/grub
+	mkdir -p $(BUILD_DIR)/mnt
 
 #
 # Kernel

README.md

@@ -6,15 +6,14 @@
 ![repo size](https://img.shields.io/github/repo-size/PKM74/Nanite)
 ![license](https://img.shields.io/github/license/PKM74/Nanite)
 
-Very small OS that can run on X86 Hardware.
+A Very small OS that can run on X86 Hardware.
-Designed to run from just one 1.44MB floppy disk, ATA support coming soon! (TM)
 
 Good luck figuring out the spagetti code i write... (sorry not sorry ;D)
 
-Designed for older computers such as a Pentium (i586) Class Machine. I would recomend atleast a Pentium 2 Class System or higher however.
+Designed for older computers such as a Pentium (i586) Class Machine. I however would recomend atleast a Pentium 2 Class System or higher.
 
 ## Features
-- Support for the GNU GRUB Bootloader
+- Support for the GNU GRUB 2 Bootloader and Multiboot V2
 - Custom Theme for GRUB (Coming Soon!)
 - Basic Memory Paging
 - Support for Floppy Disk Drives (FDDs)
@@ -32,11 +31,11 @@ To write to a disk, use `./write.sh` WARNING: **is hard coded to /dev/sdb** (sor
 You could also run `make all` but the scripts a bit better tbh, it even automates starting QEMU.
 
 ### Build Requirements
-- mtools
 - make
 - gcc (or really any C compiler)
 - nasm
-- grub
+- grub2
+- e2tools
 
 ## How is Testing Done
 Testing is mostly done with QEMU These days, but I do sometimes pull out my Dell Latitude D610 to test on (for anyone wondering its completely maxed out. [2GB of ram Pentium M @ 2.23GHz])

build.sh

@@ -31,6 +31,33 @@ make -s
 echo ---------
 echo Finished!
 echo ---------
+read -p "Do you want to make to make image bootable? [Requires sudo] (y/n) " yn 
+case $yn in
+	y)
+	echo ----------------
+	echo Installing GRUB!
+	echo ----------------
+
+	sudo losetup -d /dev/loop500
+	sudo losetup /dev/loop500 build/main.img
+	sudo grub-install \
+		--modules="part_msdos" \
+		--boot-directory=build/mnt/boot \
+		--target=i386-pc \
+		--bootloader-id=GRUB \
+		/dev/loop500 -v
+	sudo losetup -d /dev/loop500
+
+	;;
+	n ) echo exiting...;
+		exit;;
+	* ) echo invalid response;
+		exit 1;;
+esac
+echo ---------
+echo Finished!
+echo ---------
+
 read -p "Do you want to Start QEMU? (y/n) " yn
 
 case $yn in 
@@ -44,7 +71,7 @@ case $yn in
 	-serial chardev:serial1 \
 	-audiodev pa,id=speaker \
 	-machine pcspk-audiodev=speaker \
-	-fda build/main_floppy.img \
+	-hda build/main.img \
 	-m size=512M
 	echo --------
 	echo Finshed!

src/kernel/boot.asm

@@ -0,0 +1,50 @@
+;/////////////////////;
+;Nanite OS            ;
+;COPYRIGHT (C) 2024   ;
+;Tyler McGurrin       ;
+;/////////////////////;
+[bits 32]
+section .entry
+
+extern __bss_start
+extern __end
+
+extern start
+global entry
+
+; My Life is totally funnnn
+global entry
+entry:
+    ; 6 - setup segment registers
+    mov ax, 0x10
+    mov ds, ax
+    mov ss, ax
+    mov al, 0
+    cld
+    rep stosb
+
+    ; clear BSS (uninit data)
+    mov edi, __bss_start
+    mov ecx, __end
+    sub ecx, edi
+
+
+    xor edx, edx
+    push edx
+    call start
+
+    cli
+    hlt
+
+section .multiboot_header
+header_start:
+    dd 0xe85250d6                ; magic number
+    dd 0                         ; protected mode code
+    dd header_end - header_start ; header length
+    dd 0x100000000 - (0xe85250d6 + 0 + (header_end - header_start)) ; checksum
+
+    ; required end tag
+    dw 0    ; type
+    dw 0    ; flags
+    dd 8    ; size
+header_end:

src/kernel/linker.ld

@@ -1,4 +1,4 @@
-ENTRY(start)
+ENTRY(entry)
 OUTPUT_FORMAT("binary")
 phys = 0x00100000;
 
@@ -7,7 +7,7 @@ SECTIONS
     . = phys;
 
     .entry              : { __entry_start = .;      *(.entry)   }
-    .text               : { __text_start = .;       *(.text)    }
+    .text               : { __text_start = ALIGN(8); KEEP(*(multiboot_header)) *(.text)   }
     .data               : { __data_start = .;       *(.data)    }
     .rodata             : { __rodata_start = .;     *(.rodata)  }
     .bss                : { __bss_start = .;        *(.bss)     }

src/kernel/main.c

@@ -21,9 +21,6 @@
 #include <util/util.h>
 #include <version.h>
 
-extern uint8_t __bss_start;
-extern uint8_t __end;
-
 uint16_t DEBUG_COM_PORT = COM1_PORT;
 
 void __attribute__((section(".entry"))) start() {

src/kernel/version.h

@@ -6,4 +6,4 @@
 #pragma once
 
 #define LOGO "    _   _____    _   __________________\n   / | / /   |  / | / /  _/_  __/ ____/\n  /  |/ / /| | /  |/ // /  / / / __/   \n / /|  / ___ |/ /|  // /  / / / /___   \n/_/ |_/_/  |_/_/ |_/___/ /_/ /_____/   \n"
-#define VERSION "RD-00037"
+#define VERSION "RD-00038"