From eb37e8a20c9f94f8fa7d3d0011fbd3bbf7651d4e Mon Sep 17 00:00:00 2001
From: fslongjin <fslongjin@vip.qq.com>
Date: Sat, 15 Jan 2022 12:49:18 +0800
Subject: [PATCH] =?UTF-8?q?:tada:=20=E5=88=9B=E5=BB=BA=E4=BA=86boot?=
 =?UTF-8?q?=E7=A8=8B=E5=BA=8F=EF=BC=81?=
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

---
 .gitignore                |  2 ++
 .idea/.gitignore          |  8 ++++++
 CMakeLists.txt            |  6 +++++
 bootloader/CMakeLists.txt |  9 +++++++
 bootloader/boot.asm       | 57 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 82 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .idea/.gitignore
 create mode 100644 CMakeLists.txt
 create mode 100644 bootloader/CMakeLists.txt
 create mode 100644 bootloader/boot.asm

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..27aa8727
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/cmake-build-debug/
+/bin/
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 00000000..13566b81
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 00000000..fbaf0cd1
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.20)
+project(dragonOS C)
+
+set(CMAKE_C_STANDARD 11)
+add_subdirectory(bootloader)
+
diff --git a/bootloader/CMakeLists.txt b/bootloader/CMakeLists.txt
new file mode 100644
index 00000000..fb012ece
--- /dev/null
+++ b/bootloader/CMakeLists.txt
@@ -0,0 +1,9 @@
+set(CMAKE_ASM_NASM_SOURCE_FILE_EXTENSIONS nasm asm S)
+set(CMAKE_ASM_NASM_OBJECT_FORMAT bin)
+set(CMAKE_ASM_NASM_FLAGS "-e")
+set(CMAKE_ASM_NASM_LINK_EXECUTABLE "nasm <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
+enable_language(ASM_NASM)
+
+#修改输出的路径
+set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
+add_executable(boot.bin boot.asm)
\ No newline at end of file
diff --git a/bootloader/boot.asm b/bootloader/boot.asm
new file mode 100644
index 00000000..97b55440
--- /dev/null
+++ b/bootloader/boot.asm
@@ -0,0 +1,57 @@
+;将程序开始位置设置为0x7c00处，并给BaseOfStack赋值为0x7c00
+    org 0x7c00
+
+BaseOfStack	equ	0x7c00
+
+Label_Start:
+    ;初始化寄存器
+    mov ax, cs
+    mov ds, ax
+    mov es, ax
+    mov ss, ax
+    mov sp, BaseOfStack
+
+    ;清屏
+    mov ax, 0x0600  ;AL=0时，清屏，BX、CX、DX不起作用
+    mov bx, 0x0700  ;设置白色字体，不闪烁，字体正常亮度，黑色背景
+    mov cx, 0
+    mov dx, 0184fh
+    int 10h
+
+    ;设置屏幕光标位置为左上角(0,0)的位置
+    mov ax, 0x0200
+    mov bx, 0x0000
+    mov dx, 0x0000
+    int 10h
+
+    ;在屏幕上显示Start Booting
+    mov ax, 0x1301 ;设置显示字符串，显示后，光标移到字符串末端
+    mov bx, 0x000f ;设置黑色背景，白色字体，高亮度，不闪烁
+    mov dx, 0x0000 ;设置游标行列号均为0
+    mov cx, 10 ;设置字符串长度为10
+
+            ;为什么这里不能直接把ds赋值给es？
+    push ax
+    mov ax, ds
+    mov es, ax
+    pop ax
+    mov bp, StartBootMessage
+    int 10h
+
+    ;软盘驱动器复位
+    xor ah, ah
+    xor dl, dl
+    int 13h
+
+    jmp $
+
+StartBootMessage:   db  "Start Boot"
+
+;填满整个扇区的512字节
+    times 510 - ( $ - $$ ) db 0
+    dw 0xaa55 ;===确保以0x55 0xaa为结尾
+
+
+
+
+