Changed to using Boch to better handle debugging the kernel. Updated build system with a new script to handle working with the build_numbers.c file.

.gitignore

@@ -1,2 +1,5 @@
 *.o
 *.elf
+*.log
+*.iso
+*.bin

Makefile

@@ -1,50 +1,33 @@
+.DELETE_ON_ERROR:
+
 CC = gcc
 GCCPARAMS = -m32 -fno-pie -nostdlib -fstrength-reduce -fomit-frame-pointer -finline-functions -fno-builtin -nostdinc -fno-stack-protector
 ASPARAMS = -f elf32
 LDPARAMS = -m elf_i386
-INCBULDNUM = sh make_buildnum.sh
 
 SRC := kernel
 OBJ := obj
 
 SOURCES := $(wildcard $(SRC)/*.c)
-ASMSOURCES := $(wildcard $(SRC)/*.asm)
+ASMSOURCES := $(wildcard $(SRC)/*.s)
 OBJECTS := $(patsubst $(SRC)/%.c, $(OBJ)/%.o, $(SOURCES))
-ASMOBJECTS := $(patsubst $(SRC)/%.asm, $(OBJ)/%.o, $(ASMSOURCES))
+ASMOBJECTS := $(patsubst $(SRC)/%.s, $(OBJ)/%.o, $(ASMSOURCES))
 
 run: kernel.iso
-	qemu-system-x86_64 -serial pipe:/tmp/guest -m 256M -cdrom kernel.iso &
+	bochs -f support_files/boch.txt -q
 
 $(OBJ)/%.o: $(SRC)/%.c
-	mkdir -p $(@D)
 	$(CC) $(GCCPARAMS) $(SRC) -c -o $@ $<
 
-$(OBJ)/%.o: $(SRC)/%.asm
+$(OBJ)/%.o: $(SRC)/%.s
-	mkdir -p $(@D)
 	nasm $(ASPARAMS) -o $@ $<
 	
-kernel.bin: $(OBJECTS) $(ASMOBJECTS)
+kernel.o: build_numbers.c $(OBJECTS) $(ASMOBJECTS)
-	@#Crap way to increment the build number, but will do for now
+	@sh support_files/run_linker.sh "$(LDPARAMS)" obj/bin/$@ "$(OBJECTS)" "$(ASMOBJECTS)"
-	@#thanks to my limited knowledge of Makefiles.
-	@#Sadly this number in the compiled code will always be off by one with this method....
-	@sh make_buildnum.sh
-	mkdir -p obj/bin
-	ld $(LDPARAMS) -T linker.ld -o obj/bin/$@ $(OBJECTS) $(ASMOBJECTS)
 
-kernel.iso: kernel.bin
+kernel.iso: kernel.o
-	mkdir iso
+	cp obj/bin/kernel.o iso/boot/kernel.bin
-	mkdir iso/boot
-	mkdir iso/boot/grub
-	cp obj/bin/kernel.bin iso/boot/kernel.bin
-	echo 'set timeout=0' > iso/boot/grub/grub.cfg
-	echo 'set default=0' >> iso/boot/grub/grub.cfg
-	echo '' >> iso/boot/grub/grub.cfg
-	echo 'menuentry "SDOS" {'  >> iso/boot/grub/grub.cfg
-	echo '  multiboot /boot/kernel.bin'    	 >> iso/boot/grub/grub.cfg
-	echo '  boot'                            >> iso/boot/grub/grub.cfg
-	echo '}'                                 >> iso/boot/grub/grub.cfg
 	grub-mkrescue --output=kernel.iso iso
-	rm -rf iso
 
 .PHONY: clean
 clean:
@@ -52,4 +35,4 @@ clean:
 
 .PHONY: resetbuild
 resetbuild:
-	echo 0 > build.number
+	@sh support_files/handle_build_numbers.sh build_numbers.c reset

build_numbers.c

@@ -1,6 +1,3 @@
 #ifndef KERNEL_VERSION_NUMBER
-#define KERNEL_VERSION_NUMBER "1.4.10-40"
+#define KERNEL_VERSION_NUMBER "1.4.10-0"
-#endif
-#ifndef CONSOLE_VERSION_NUMBER
-#define CONSOLE_VERSION_NUMBER "0.4.5-0"
 #endif

iso/boot/grub/grub.cfg

@@ -0,0 +1,7 @@
+set timeout=0
+set default=0
+
+menuentry "SDOS" {
+  multiboot /boot/kernel.bin
+  boot
+}

kernel/kmain.c

@@ -0,0 +1,5 @@
+
+void kmain()
+{
+	asm("hlt");
+}

kernel/loader.s

@@ -0,0 +1,25 @@
+global loader
+
+MAGIC_NUMBER equ 0x1BADB002
+FLAGS equ 0x0
+CHECKSUM equ -MAGIC_NUMBER
+KERNEL_STACK_SIZE equ 4096							; size of stack in bytes
+
+section .text:
+	align 4
+	dd MAGIC_NUMBER
+	dd FLAGS
+	dd CHECKSUM
+
+loader:
+	extern kmain
+	call kmain
+	;mov eax, 0xCAFEBABE
+	;mov esp, kernel_stack + KERNEL_STACK_SIZE	; piont ESP to the start of the stack (end of memory area)
+.loop:
+	jmp .loop
+
+section .bss
+	alignb 4
+	resb KERNEL_STACK_SIZE						; reserve stack for kernel
+	kernel_stack:

loader.s

@@ -1,17 +0,0 @@
-global loader
-
-MAGIC_NUMBER equ 0x1BADB002
-FLAGS equ 0x0
-CHECKSUM equ -MAGIC_NUMBER
-
-section .text:
-align 4
-	dd MAGIC_NUMBER
-	dd FLAGS
-	dd CHECKSUM
-
-loader:
-	mov eax, 0xCAFEBABE
-.loop:
-	jmp .loop
-

support_files/boch.txt

@@ -0,0 +1,9 @@
+megs: 32
+display_library: x
+romimage: file=/usr/share/bochs/BIOS-bochs-latest
+vgaromimage: file=/usr/share/bochs/VGABIOS-lgpl-latest
+ata0-master: type=cdrom, path=kernel.iso, status=inserted 
+boot: cdrom
+log: bochs.log
+clock: sync=realtime, time0=local
+cpu: count=1, ips=1000000

support_files/handle_build_numbers.sh

@@ -45,23 +45,13 @@ while IFS=' ' read -ra line; do
 			#It doesn't matter what its value is only that one is present.
 			#If there isn't a second parameter set, then we increment the meta build
 			#number, otherwise we decrement.
-			if [ "$2" == "" ]
+			if [ "$2" != "reset" ]
 			then
 				echo "Incrementing meta build number."
 				meta=$(($i + 1))
-			elif [ "$2" == "reset" ]
+			else
-			then
 				echo "Resetting meta build number."
 				meta=0
-			else
-				if [ "$i" -gt 0 ]
-				then
-					echo "Decrementing meta build number."
-					meta=$(($i - 1))
-				else
-					echo "Meta build number already zero, nothing to be done."
-					meta=0
-				fi
 			fi
 			;;
 		esac

support_files/run_linker.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+#Handles the final linking of the OS binaries to build the kernel.
+#This script will allow for rolling back the build number found in the
+#build_numbers.c file.
+
+ld $1 -T support_files/link.ld -o $2 $3 $4
+
+if [[ $? == 0 ]]
+then
+	./support_files/handle_build_numbers.sh build_numbers.c
+	exit 0
+else
+	exit 1
+fi