boot_fd.lst

nucleus_arm.rar

     1                                  [BITS 16]
     2                                  [ORG 0x7C00]
     3                                  
     4 00000000 EB3C                    jmp Entry
     5 00000002 90                      nop
     6                                       
     7 00000003 4E55434C45555330             OEM_ID                db "NUCLEUS0"
     8 0000000B 0002                         BytesPerSector        dw 0x0200
     9 0000000D 01                           SectorsPerCluster     db 0x01
    10 0000000E 0100                         ReservedSectors       dw 0x0001
    11 00000010 02                           TotalFATs             db 0x02
    12 00000011 E000                         MaxRootEntries        dw 0x00E0
    13 00000013 400B                         TotalSectorsSmall     dw 0x0B40
    14 00000015 F0                           MediaDescriptor       db 0xF0
    15 00000016 0900                         SectorsPerFAT         dw 0x0009
    16 00000018 1200                         SectorsPerTrack       dw 0x0012
    17 0000001A 0200                         NumHeads              dw 0x0002
    18 0000001C 00000000                     HiddenSectors         dd 0x00000000
    19 00000020 00000000                     TotalSectorsLarge     dd 0x00000000
    20 00000024 00                           DriveNumber           db 0x00
    21 00000025 00                           Flags                 db 0x00
    22 00000026 29                           Signature             db 0x29
    23 00000027 0DD001C0                     VolumeID              dd 0xC001D00D
    24 0000002B 4E55434C455553424F-          VolumeLabel           db "NUCLEUSBOOT"
    25 00000034 4F54               
    26 00000036 4641543132202020             SystemID              db "FAT12   "
    27                                  
    28                                  Entry:
    29                                       ; code located at 0000:7C00, adjust segment registers
    30 0000003E EA[4300]0000            	jmp 0x0000:_Start
    31                                  
    32                                  _Start:
    33 00000043 FA                                cli
    34 00000044 8CC8                              mov     ax, cs
    35 00000046 8ED8                              mov     ds, ax
    36 00000048 8EC0                              mov     es, ax
    37 0000004A 8EE0                              mov     fs, ax
    38 0000004C 8EE8                              mov     gs, ax
    39 0000004E 8816[2400]                        mov     [DriveNumber],dl		; Use drive number passed from BIOS
    40                                       ; create stack
    41 00000052 8ED0                              mov     ss, ax
    42 00000054 BCF8FF                            mov     sp, 0xFFF8
    43 00000057 FB                                sti
    44                                       ; post message
    45 00000058 BE[C501]                          mov     si, msgLoading
    46 0000005B E8CF00                            call    DisplayMessage
    47                                  LOAD_ROOT:
    48                                       ; compute size of root directory and store in 慶x