boot/x86/fat32-structs.s

   1 ; FAT32 data structures
   2 ; Because they have to be defined before use
   3
   4 struc dir_entry
   5         .name: resb 11
   6         .attr: resb 1
   7         .ntres: resb 1
   8         .crttimetenth: resb 1
   9         .crttime: resw 1
  10         .crtdate: resw 1
  11         .lstaccdate: resw 1
  12         .firstclushi: resw 1
  13         .wrttime: resw 1
  14         .wrtdate: resw 1
  15         .firstcluslo: resw 1
  16         .filesize: resd 1
  17 endstruc
  18
  19 ; BPB definition, we use offsets to bp to save space
  20         %define BS_jmpBoot [bp]
  21         %define BS_OemName [bp+0x3]
  22         %define BPB_BytsPerSec [bp+0xb]
  23         %define BPB_SecPerClus [bp+0xd]
  24         %define BPB_RsvdSecCnt [bp+0xe]
  25         %define BPB_NumFats [bp+0x10]
  26         %define BPB_RootEntCnt [bp+0x11]
  27         %define BPB_TotSec16 [bp+0x13]
  28         %define BPB_Media [bp+0x15]
  29         %define BPB_FatSz16 [bp+0x16] ; count of sectors
  30         %define BPB_SecPerTrk [bp+0x18]
  31         %define BPB_NumHeads [bp+0x1a]
  32         %define BPB_HiddSec [bp+0x1c]
  33         %define BPB_TotSec32 [bp+0x20]
  34         %define BPB_FatSz32 [bp+0x24]
  35         %define BPB_ExtFlags [bp+0x28]
  36         %define BPB_FSVer [bp+0x2a]
  37         %define BPB_RootClus [bp+0x2c]
  38         %define BPB_FsInfo [bp+0x30]
  39         %define BPB_BkBootSec [bp+0x32] ; number of sector
  40         %define BPB_Reserved [bp+0x34]
  41         %define BS_DrvNum [bp+0x40]
  42         %define BS_Reserved1 [bp+0x41]
  43         %define BS_BootSig [bp+0x42]
  44         %define BS_VolId [bp+0x43]
  45         %define BS_VolLab [bp+0x47]
  46         %define BS_FilSysType [bp+0x52]
  47