From 84f3aaac705dd6086355e760e3826e81161db04e Mon Sep 17 00:00:00 2001
From: fslongjin <fslongjin@vip.qq.com>
Date: Mon, 17 Jan 2022 16:50:48 +0800
Subject: [PATCH] =?UTF-8?q?:wrench:=20=E6=8A=8AFAT12=E6=96=87=E4=BB=B6?=
 =?UTF-8?q?=E7=B3=BB=E7=BB=9F=E7=9A=84=E5=8F=82=E6=95=B0=E5=B1=9E=E6=80=A7?=
 =?UTF-8?q?=E5=8D=95=E7=8B=AC=E6=8F=90=E5=8F=96=E5=87=BA=E6=9D=A5?=
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---
 bootloader/fat12.inc | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 bootloader/fat12.inc

diff --git a/bootloader/fat12.inc b/bootloader/fat12.inc
new file mode 100644
index 00000000..104a757e
--- /dev/null
+++ b/bootloader/fat12.inc
@@ -0,0 +1,25 @@
+; === 这是FAT12文件系统的信息 ===
+RootDirSectors equ 14   ;根目录占用的扇区数
+SectorNumOfRootDirStart equ 19  ; 根目录的起始扇区号
+SectorNumOfFAT1Start equ 1  ; FAT1表的起始扇区号 （因为前面有一个保留扇区（引导扇区））
+SectorBalance equ 17    ;平衡文件/目录的起始簇号与数据区域的起始簇号的差值。
+
+    BS_OEMName  db  'DragonOS'
+    BPB_BytesPerSec dw 512
+    BPB_SecPerClus db 1
+    BPB_RsvdSecCnt  dw  1
+    BPB_NumFATs db 2
+    BPB_RootEntCnt dw 224
+    BPB_TotSec16 dw 2880
+    BPB_Media db 0xf0
+    BPB_FATSz16 dw 9
+    BPB_SecPerTrk dw 18
+    BPB_NumHeads dw 2
+    BPB_HiddSec dd 0
+    BPB_TotSec32 dd 0
+    BS_DrvNum db 0
+    BS_Reserved1 db 0
+    BS_BootSig db 0x29
+    BS_VolID dd 0
+    BS_VolLab db 'boot loader'
+    BS_FileSysType db 'FAT12   '
\ No newline at end of file