diff --git a/Makefile b/Makefile
index a5320a8..9a47921 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ SRC := arch/x86/boot kernel mm drivers
all: clean iso
iso: build
- ld -b elf64-x86-64 -z muldefs -o kernel.elf -T link.lds $(shell find $(SRC) -name "*.o")
+ ld -b elf64-x86-64 -z muldefs -o kernel.elf -Map=./kernel.map -T link.lds $(shell find $(SRC) -name "*.o")
@bash build_iso.sh
build: $(SRC)
@@ -17,4 +17,7 @@ clean: $(SRC)
@for s in $(SRC); do \
make -C $$s clean || exit 1; \
done
- rm -rf *.elf *.iso
+ rm -rf *.elf *.iso *.map
+
+qemu-run:
+ qemu-system-x86_64 -m 2G HelloOS.iso
diff --git a/README.md b/README.md
index 7b40d3f..79d3ac2 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
1. 安装依赖
```bash
-$ apt install -y make gcc grub git
+$ apt install -y make gcc grub git xorriso
```
2. 代码拉取
diff --git "a/docs/resources/Linux\350\256\276\345\244\207\351\251\261\345\212\250\347\250\213\345\272\217.pdf" "b/docs/resources/Linux\350\256\276\345\244\207\351\251\261\345\212\250\347\250\213\345\272\217.pdf"
new file mode 100644
index 0000000..faeb316
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diff --git a/docs/resources/interceptor_descriptor.webp b/docs/resources/interceptor_descriptor.webp
new file mode 100644
index 0000000..92f4a7e
Binary files /dev/null and b/docs/resources/interceptor_descriptor.webp differ
diff --git a/docs/resources/memory_addr.png b/docs/resources/memory_addr.png
new file mode 100644
index 0000000..dcd5f7d
Binary files /dev/null and b/docs/resources/memory_addr.png differ
diff --git a/docs/resources/seg_gdtr.png b/docs/resources/seg_gdtr.png
new file mode 100644
index 0000000..1e0634e
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diff --git a/docs/resources/segment_descriptor.webp b/docs/resources/segment_descriptor.webp
new file mode 100644
index 0000000..582706f
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diff --git a/docs/resources/segment_selector.webp b/docs/resources/segment_selector.webp
new file mode 100644
index 0000000..eb5bbbd
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diff --git "a/docs/\345\210\206\346\256\265\345\210\206\351\241\265.md" "b/docs/\345\210\206\346\256\265\345\210\206\351\241\265.md"
new file mode 100644
index 0000000..f1a83b6
--- /dev/null
+++ "b/docs/\345\210\206\346\256\265\345\210\206\351\241\265.md"
@@ -0,0 +1,37 @@
+## 内存地址
+
+
+* 逻辑地址：程序代码指令中的地址，可以认为是虚拟地址；
+* 线性地址：逻辑地址经过分段计算后得到。在现代 x86-64 位操作系统中，线性地址和逻辑地址是一样的；
+* 物理地址：线性地址经过 MMU 后，得到物理上真正地址；
+
+
+
+## 分段
+
+段描述符：用于描述一个段的信息。在长模式下，其格式是：
+
+
+
+在操作系统中，多个段描述符组成一个描述符表。通过 gdtr（全局描述符寄存器）指向表的基地址。
+
+> 还有一个 ldtr（局部描述符寄存器），现代操作系统都是通过分页来管理内存，分段处理只是为了兼容，ldtr 用的比较少，所以也不讨论 ldtr。
+
+段选择子：通过段选择子可以确定该使用哪个段描述符：
+
+
+
+通过分段来计算线性地址流程：
+
+
+
+同理，在长模式下中断门描述符格式：
+
+
+
+
+
+
+
+
+
diff --git a/mm/mm.c b/mm/mm.c
index 94240c4..1da1a99 100644
--- a/mm/mm.c
+++ b/mm/mm.c
@@ -52,7 +52,7 @@ void page_bitmap_init(uint_t start_addr) {
gmdsc.total_mem_length = total_mem;
gmdsc.page_bits = (uint_t*)start_addr;
- gmdsc.page_bits_size = total_mem >> PAGE_4K_SHIFT;
+ gmdsc.page_bits_size = total_mem >> PAGE_4K_SHIFT;
gmdsc.page_bits_length = (((uint_t)(total_mem >> PAGE_4K_SHIFT) + sizeof(uint_t) * 8 - 1) / 8) & ( ~ (sizeof(uint_t) - 1));
kinfo("page_bitmap start_addr:%x page_bits_size:%d page_bits_length:%d\n", gmdsc.page_bits, gmdsc.page_bits_size, gmdsc.page_bits_length);
memset(gmdsc.page_bits, 0xff, gmdsc.page_bits_length);