Chapter 8：記憶體管理系統
===
:::info
這是讀書筆記


作者：鄭鋼
出版社：佳魁資訊股份有限公司
出版日期：2017/05/31
:::
---

# makefile 簡介

不錯的網路資源
* https://www.mropengate.com/2018/01/makefile.html
* https://hackmd.io/@sysprog/SySTMXPvl
* https://github.com/yyluoyong/Make-3.8-Chinese-Manuals/blob/master/main.pdf

## 檔案結構

>[!Tip] 盡可能的簡化整個檔案目錄


## makefile

#####################################
#       Environment                 #
#####################################
BUILD_DIR       = ./build
OUT_DIR         = ./out

#####################################
#       Build Tools                 #
#####################################
AS              = nasm
CC              = x86_64-linux-gnu-gcc
LD              = x86_64-linux-gnu-ld

#####################################
#       Build Flags                 #
#####################################
KERNEL_ENTRY    = 0xc0001500
ASFLAGS         = -f elf
CFLAGS          = -c -m32 -fno-stack-protector -fno-builtin
LDFLAGS         = -m elf_i386 -Ttext $(KERNEL_ENTRY) -e main -z noexecstack

#####################################
#       Include Files               #
#####################################
INCLUDE         = -I ./include

#####################################
#       Output Files                #
#####################################
obj         :=

#####################################
#       MBR: mbr.bin                #
#####################################
$(OUT_DIR)/mbr.bin: boot/mbr.S
    $(AS) -I boot/ $< -o $@

#####################################
#       Bootloader: loader.bin      #
#####################################
$(OUT_DIR)/loader.bin: boot/loader.S
    $(AS) -I boot/ $< -o $@

#####################################
#       Kernel Objects: C           #
#####################################
$(BUILD_DIR)/main.o: kernel/main.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/main.o

$(BUILD_DIR)/init.o: kernel/init.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/init.o

$(BUILD_DIR)/interrupt.o: kernel/interrupt.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/interrupt.o

$(BUILD_DIR)/timer.o: kernel/timer.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/timer.o

$(BUILD_DIR)/debug.o: kernel/debug.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/debug.o

$(BUILD_DIR)/string.o: kernel/string.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/string.o

$(BUILD_DIR)/bitmap.o: kernel/bitmap.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/bitmap.o

$(BUILD_DIR)/memory.o: kernel/memory.c
    $(CC) $(CFLAGS) $(INCLUDE) $< -o $@
obj += $(BUILD_DIR)/memory.o


#####################################
#       Kernel Objects: Assembly    #
#####################################

$(BUILD_DIR)/print.o: kernel/print.S
    $(AS) $(ASFLAGS) $< -o $@
obj += $(BUILD_DIR)/print.o

$(BUILD_DIR)/kernel.o: kernel/kernel.S
    $(AS) $(ASFLAGS) $< -o $@
obj += $(BUILD_DIR)/kernel.o

#####################################
#       Kernel: kernel.bin          #
#####################################
$(OUT_DIR)/kernel.bin: $(obj)
    $(LD) $(LDFLAGS) $^ -o $@

#####################################
#       Command                     #
#####################################
.PHONY : dir clean all

dir:
    @echo ">>>Start $@..."
    @echo "mkdir $(BUILD_DIR)"
    @if [ ! -d $(BUILD_DIR) ];then mkdir $(BUILD_DIR);fi
    @echo "mkdir $(OUT_DIR)"
    @if [ ! -d $(OUT_DIR) ];then mkdir $(OUT_DIR);fi
    @echo ">>>make $@ done."

clean:
    @echo ">>>Start $@..."
    rm -f $(BUILD_DIR)/*
    rm -f $(OUT_DIR)/*
    @echo ">>>make $@ done."

all: dir $(OUT_DIR)/mbr.bin $(OUT_DIR)/loader.bin $(OUT_DIR)/kernel.bin
    @echo ">>>make $@ done."

# assert 實作

## Source Code

https://github.com/yifengyou/os-elephant/tree/master/code/c08/a

## Result


# 字串操作函數

## Source Code

https://github.com/yifengyou/os-elephant/tree/master/code/c08/b

# Bitmap Operation

## Source Code

https://github.com/yifengyou/os-elephant/tree/master/code/c08/c

# 記憶體管理

## Source Code

https://github.com/yifengyou/os-elephant/tree/master/code/c08/e

## Result