整理眾多、顯得有點雜亂的檔案並加上 Makefile

目前為止，檔案有些多且雜亂。

$ tree
.
├── a.img
├── boot
│   ├── boot.asm
│   ├── include
│   │   ├── fat12hdr.inc
│   │   ├── load.inc
│   │   └── pm.inc
│   └── loader.asm
├── include
│   ├── const.h
│   ├── protect.h
│   └── type.h
├── kernel
│   ├── kernel.asm
│   └── start.c
└── lib
    ├── kliba.asm
    └── string.asm

與此同時，編譯、連結的指定越來越多，我們採用 Makefile 來解決此問題。

Makefile

################
# Makefile for Orange'S
################

# Entry point of Orange'S
# It must have the same value with 'KernelEntryPointPhyAddr; in load.inc!
ENTRYPOINT = 0x30400

# Offset of entry point in kernel file
# It depends on ENTRYPOINT
ENTRYOFFSET = 0x400

# Programs, flags, etc.
ASM   = nasm
DASM  = ndisam
CC   = gcc
LD   = ld
ASMBFLAGS = -I boot/include/
ASMKFLAGS = -I include/ -f elf
CFLAGS  = -I include/ -c -fno-builtin
LDFLAGS  = -s -Ttext $(ENTRYPOINT)
DASMFLAGS = -u -o $(ENTRYPOINT) -e $(ENTRYOFFSET)

# This program
ORANGESBOOT  = boot/boot.bin boot/loader.bin
ORANGESKERNEL = kernel.bin
OBJS   = kernel/kernel.o kernel/start.o lib/kliba.o lib/string.o
DASMOUTPUT  = kernel.bin.asm

# All Phony Targets
.PHONY : everything final image clean realclean disasm all buildimg

# Default starting position
everything : $(ORANGESBOOT) $(ORANGESKERNEL)

all : realclean everything

final : all clean

image : final buildimg

clean :
 rm -f $(OBJS)

realclean :
 rm -f $(OBJS) $(ORANGESBOOT) $(ORANGESKERNEL)

disasm :
 $(DASM) $(DASMFLAGS) $(ORANGESKERNEL) > $(DASMOUTPUT)

# We assume that "a.img" exists in current folder
buildimg :
 mkdir tmp
 dd if=boot/boot.bin of=a.img bs=512 count=1 conv=notrunc
 sleep 1
 sudo mount -o loop a.img tmp
 sleep 1
 sudo cp -fv boot/loader.bin tmp
 sudo cp -fv kernel.bin tmp
 sleep 1
 sudo umount tmp
 sleep 1
 rmdir tmp

boot/boot.bin : boot/boot.asm boot/include/load.inc boot/include/fat12hdr.inc
 $(ASM) $(ASMBFLAGS) -o $@ $<

boot/loader.bin : boot/loader.asm boot/include/load.inc boot/include/fat12hdr.inc boot/include/pm.inc
 $(ASM) $(ASMBFLAGS) -o $@ $<

$(ORANGESKERNEL) : $(OBJS)
 $(LD) $(LDFLAGS) -o $(ORANGESKERNEL) $(OBJS)

kernel/kernel.o : kernel/kernel.asm
 $(ASM) $(ASMKFLAGS) -o $@ $<

kernel/start.o : kernel/start.c include/type.h include/const.h include/protect.h
 $(CC) $(CFLAGS) -o $@ $<

lib/kliba.o : lib/kliba.asm
 $(ASM) $(ASMKFLAGS) -o $@ $<

lib/string.o : lib/string.asm
 $(ASM) $(ASMKFLAGS) -o $@ $<

嘗試修改 kernel/start.c，在 cstart() 函數最後增加一行，

disp_str("-----\"cstart\" ends-----\n");

並進行指令

$ make image

最後的執行畫面