; ***************************************************************************** ; ; DRV_INIT2.ASM [ TRDOS Kernel Drive Initialization Procedures ] ; 25/06/2009 ; DRV_INIT.ASM ; Copyright (C) 2005 Erdogan TAN [ 29/01/2005 ] ; ; TRDOS.ASM (include drv_init.asm) ; ; ***************************************************************************** ; TRFS bs_FS_JmpBoot equ 0 ; jmp short bsBootCode ; db 0EBh, db 3Fh, db 90h bs_FS_Identifier equ 3 ; db 'FS', db 0 bs_FS_BytesPerSec equ 6 ; dw 512 bs_FS_MediaAttrib equ 8 ; db 3 bs_FS_PartitionId equ 9 ; db 0A1h bs_FS_VersionMaj equ 10 ; db 01h bs_FS_VersionMin equ 11 ; db 0 bs_FS_BeginSector equ 12 ; dd 0 bs_FS_VolumeSize equ 16 ; dd 2880 bs_FS_StartupFD equ 20 ; dd 0 bs_FS_MATLocation equ 24 ; dd 1 bs_FS_RootDirD equ 28 ; dd 8 bs_FS_SystemConfFD equ 32 ; dd 0 bs_FS_SwapFD equ 36 ; dd 0 bs_FS_UnDelDirD equ 40 ; dd 0 bs_FS_DriveNumber equ 44 ; db 0 bs_FS_LBA_Ready equ 45 ; db 0 bs_FS_MagicWord equ 46 bs_FS_SecPerTrack equ 46 ; db 0A1h bs_FS_Heads equ 47 ; db 01h bs_FS_OperationSys equ 48 ; db "TR-SINGLIX v1.0b" bs_FS_Terminator equ 64 ; db 0 bs_FS_BootCode equ 65 FS_MAT_DATLocation equ 12 FS_MAT_DATScount equ 16 FS_MAT_FreeSectors equ 20 FS_MAT_FirstFreeSector equ 24 FS_RDT_VolumeSerialNo equ 28 FS_RDT_VolumeName equ 64 ; FAT12 + FAT16 + FAT32 BS_JmpBoot equ 0 BS_OEMName equ 3 BPB_BytsPerSec equ 11 BPB_SecPerClust equ 13 BPB_RsvdSecCnt equ 14 BPB_NumFATs equ 16 BPB_RootEntCnt equ 17 BPB_TotalSec16 equ 19 BPB_Media equ 21 BPB_FATSz16 equ 22 BPB_SecPerTrk equ 24 BPB_NumHeads equ 26 BPB_HiddSec equ 28 BPB_TotalSec32 equ 32 ; FAT12 and FAT16 only BS_DrvNum equ 36 BS_Reserved1 equ 37 BS_BootSig equ 38 BS_VolID equ 39 BS_VolLab equ 43 BS_FilSysType equ 54 ; 8 bytes BS_BootCode equ 62 ; FAT32 only BPB_FATSz32 equ 36 ; FAT32, 4 bytes BPB_ExtFlags equ 40 ; FAT32, 2 bytes BPB_FSVer equ 42 ; FAT32, 2 bytes BPB_RootClus equ 44 ; FAT32, 4 bytes BPB_FSInfo equ 48 ; FAT 32, 2 bytes BPB_BkBootSec equ 50 ; FAT32, 2 bytes BPB_Reserved equ 52 ; FAT32, 12 bytes BS_FAT32_DrvNum equ 64 ; FAT32, 1 byte BS_FAT32_Reserved1 equ 65 ; FAT32, 1 byte BS_FAT32_BootSig equ 66 ; FAT32, 1 byte BS_FAT32_VolID equ 67 ; FAT32, 4 bytes BS_FAT32_VolLab equ 71 ; FAT32, 11 bytes BS_FAT32_FilSysType equ 82 ; FAT32, 8 bytes BS_FAT32_BootCode equ 90 BS_Validation equ 510 proc_drv_init proc near xor dl,dl mov si, offset DiskParams dparam_read: call proc_dparam mov dl, byte ptr [SI][DPDisks] add si, 40h cmp dl, 2 jne short pass_floppy1 dec dl call proc_dparam pass_floppy1: mov dl, 80h add si, 40h call proc_dparam jnc short pass_hd_15h_error mov word ptr [si][DPNumOfSecs], 0 mov word ptr [si][DPNumOfSecs]+2,0 pass_hd_15h_error: mov ah, byte ptr [SI][DPDisks] mov byte ptr [HDCounter], ah next_hard_disk: dec byte ptr [HDCounter] cmp byte ptr [HDCounter], 0 jna short load_hd_partition_tables inc dl add si, 40h call proc_dparam jnc short next_hard_disk mov word ptr [si][DPNumOfSecs], 0 mov word ptr [si][DPNumOfSecs]+2,0 jmp short next_hard_disk load_hd_partition_tables: mov si, offset Disk_hd0 mov di, offset PTable_hd0 push ds pop es mov dl, 80h mov cx, 4 load_next_hd_partition_table: push cx push dx push si push di cmp byte ptr [SI]+1, 03h jne short pass_pt_this_hard_disk call proc_load_masterboot jc short pass_pt_this_hard_disk pop di push di mov si, offset PartitionTable mov cx, 32 rep movsw pass_pt_this_hard_disk: pop di pop si pop dx pop cx inc dl add si, 40h add di, 40h loop load_next_hd_partition_table load_extended_dos_partitions: mov si, Offset PTable_hd0 mov di, Offset PTable_ep0 mov byte ptr [HDCounter], 80h next_hd_extd_partition: push si mov cx, 4 hd_check_fs_id_05h: mov al, byte ptr [SI][ptFileSystemName] cmp al, 05h ; Is it an extended dos partition ? je short pass_hd_check_05h cmp al, 0Fh ; Is it an extended win4 (LBA mode) partition ? je short pass_hd_check_0Fh continue_to_check_ep: add si, 10h loop hd_check_fs_id_05h continue_check_ep_next_disk: pop si add si, 40h add di, 40h cmp byte ptr [HDCounter], 83h jnb logical_drv_init inc byte ptr [HDCounter] jmp short next_hd_extd_partition pass_hd_check_05h: push cx mov ax, word ptr [SI][ptStartSector] mov dx, word ptr [SI][ptStartSector]+2 xor bh,bh mov bl, byte ptr [HDCounter] push bx sub bl, 80h shl bl, 1 shl bl, 1 mov word ptr [Val_StartSector][BX],ax mov word ptr [Val_StartSector][BX]+2,dx pop dx mov dh, byte ptr [SI][ptBeginHead] mov cx, word ptr [SI][ptBeginSector] mov ax, 0201h ; Read 1 sector mov bx, offset MasterBootBuff push ds pop es int 13h pop cx jc short continue_to_check_ep push si push di push cx mov si, offset PartitionTable mov cx, 32 rep movsw pop cx pop di pop si jmp short continue_check_ep_next_disk pop_di_check_next_ep: pop di jmp continue_to_check_ep pass_hd_check_0Fh: mov ax, word ptr [SI][ptStartSector] mov dx, word ptr [SI][ptStartSector]+2 xor bh,bh mov bl, byte ptr [HDCounter] sub bl, 80h push bx shl bl, 1 shl bl, 1 mov word ptr [Val_StartSector][BX],ax mov word ptr [Val_StartSector][BX]+2,dx pop ax push di mov ah, 40h mul ah mov di, offset Disk_hd0 add di, ax ep_mov_dap_parameters: push ds pop es cmp byte ptr [DI][DAP_PacketSize], 10h jne short pop_di_check_next_ep mov word ptr [DI][DAP_Destination], offset MasterBootBuff push ds pop word ptr [DI][DAP_Destination]+2 mov byte ptr [DI][DAP_NumOfBlocks],1 push si push di add si, ptStartSector add di, DAP_LBA_Address movsw movsw pop si add si, DAP_PacketSize ; DS:SI= DAP Location mov ah, 42h ; Extended Disk Read - LBA Read mov dl, byte ptr [HDCounter] int 13h pop si pop di jc continue_to_check_ep push di push si push cx mov si, offset PartitionTable mov cx, 32 rep movsw pop cx pop si pop di jmp continue_check_ep_next_disk logical_drv_init: mov byte ptr [Hard_Disk], 80h mov cx, 4 xor al, al mov si, offset PTable_Buffer mov di, offset Logical_DOSDisks + 200h mov byte ptr [Last_DOS_DiskNo], 1 ldrv_init_next_hdp: push si push cx push ax push di cmp byte ptr [SI][ptFileSystemName], 06h jne short pass_this_is_FAT16_CHS_disk mov byte ptr [DI][LD_DiskType], 2 mov dl, byte ptr [Hard_Disk] mov byte ptr [DI][LD_PhyDrvNo], dl mov byte ptr [DI][LD_FATType], 2 mov byte ptr [DI][LD_FSType], 06h mov bl, dl sub bl, 80h xor bh, bh mov ah, byte ptr [HD_LBAYes][BX] mov byte ptr [DI][LD_LBAYes], ah mov byte ptr [DI][LD_PartitionEntry],al mov ah, dl sub ah, 7Eh mov byte ptr [DI][LD_DParamEntry], ah mov dh, byte ptr [SI][ptBeginHead] mov cx, word ptr [SI][ptBeginSector] mov ax, 0201h ; Read 1 sector mov bx, offset DOSBootSectorBuff int 13h jc pass_this_is_FAT32_LBA_disk jmp hdp_boot_validation pass_this_is_FAT16_CHS_disk: cmp byte ptr [SI][ptFileSystemName], 0Eh jne pass_this_is_FAT16_LBA_disk mov byte ptr [DI][LD_DiskType], 2 mov dl, byte ptr [Hard_Disk] mov byte ptr [DI][LD_PhyDrvNo], dl mov byte ptr [DI][LD_FATType], 2 mov byte ptr [DI][LD_FSType], 0Eh mov byte ptr [DI][LD_LBAYes], 1 mov byte ptr [DI][LD_PartitionEntry],al mov ah, dl sub ah, 7Eh mov byte ptr [DI][LD_DParamEntry], ah mov al, 40h mul ah add ax, offset Disk_fd0 mov di, ax cmp byte ptr [DI][DAP_PacketSize], 10h jne pass_this_is_FAT32_LBA_disk mov word ptr [DI][DAP_Destination], offset DOSBootSectorBuff push ds pop word ptr [DI][DAP_Destination]+2 mov byte ptr [DI][DAP_NumOfBlocks],1 push di add si, ptStartSector add di, DAP_LBA_Address movsw movsw pop si add si, DAP_PacketSize ; DS:SI= DAP Location mov ah, 42h ; Extended Disk Read - LBA Read mov dl, byte ptr [Hard_Disk] int 13h jc pass_this_is_FAT32_LBA_disk hdp_boot_validation: mov si, offset DOSBootSectorBuff cmp word ptr [SI][BS_Validation], 0AA55h jne pass_this_is_FAT32_LBA_disk ; Singlix FS Extensions to TR-DOS 7/6/2009 cmp word ptr [SI][bs_FS_Identifier], 'SF' jne pass_singlix_fd_hd_validation_check ; 'A1h' check is not necessary if 'FS' check is passed as OK/Yes. cmp byte ptr [SI][bs_FS_PartitionID], 0A1h jne pass_singlix_fd_hd_validation_check pop di mov al, byte ptr [SI][bs_FS_LBA_Ready] mov byte ptr [DI][LD_FS_LBAYes], al mov ax, word ptr [SI][bs_FS_BytesPerSec] mov word ptr [DI][LD_FS_BytesPerSec], ax mov ax, word ptr [SI][bs_FS_MediaAttrib] mov word ptr [DI][LD_FS_MediaAttrib], ax mov ax, word ptr [SI][bs_FS_SecPerTrack] mov word ptr [DI][LD_FS_SecPerTrack], ax mov ax, word ptr [SI][bs_FS_UnDelDirD] mov dx, word ptr [SI][bs_FS_UnDelDirD]+2 mov word ptr [DI][LD_FS_UnDelDirD], ax mov word ptr [DI][LD_FS_UnDelDirD]+2, dx mov ax, word ptr [SI][bs_FS_MATLocation] mov dx, word ptr [SI][bs_FS_MATLocation]+2 mov word ptr [DI][LD_FS_MATLocation], ax mov word ptr [DI][LD_FS_MATLocation]+2, dx mov ax, word ptr [SI][bs_FS_RootDirD] mov dx, word ptr [SI][bs_FS_RootDirD]+2 mov word ptr [DI][LD_FS_RootDirD], ax mov word ptr [DI][LD_FS_RootDirD]+2, dx mov ax, word ptr [SI][bs_FS_BeginSector] mov dx, word ptr [SI][bs_FS_BeginSector]+2 mov word ptr [DI][LD_FS_BeginSector], ax mov word ptr [DI][LD_FS_BeginSector]+2, dx mov ax, word ptr [SI][bs_FS_VolumeSize] mov dx, word ptr [SI][bs_FS_VolumeSize]+2 mov word ptr [DI][LD_FS_VolumeSize], ax mov word ptr [DI][LD_FS_VolumeSize]+2, dx push di mov si, di mov ax, word ptr [SI][LD_FS_MATLocation] mov dx, word ptr [SI][LD_FS_MATLocation]+2 add ax, word ptr [SI][LD_FS_BeginSector] adc dx, word ptr [SI][LD_FS_BeginSector]+2 read_hd_MAT_sector_again: ;mov bx, offset DOSBootSectorBuff mov cx, 1 call proc_disk_read jc pass_this_is_Singlix_FS_disk mov si, bx use_hdfs_mat_sector_params: mov ax, word ptr [SI][FS_MAT_DATLocation] mov dx, word ptr [SI][FS_MAT_DATLocation]+2 mov word ptr [DI][LD_FS_DATLocation], ax mov word ptr [DI][LD_FS_DATLOcation]+2, dx mov ax, word ptr [SI][FS_MAT_DATScount] mov dx, word ptr [SI][FS_MAT_DATScount]+2 mov word ptr [DI][LD_FS_DATSectors], ax mov word ptr [DI][LD_FS_DATSectors]+2, dx mov ax, word ptr [SI][FS_MAT_FreeSectors] mov dx, word ptr [SI][FS_MAT_FreeSectors]+2 mov word ptr [DI][LD_FS_FreeSectors], ax mov word ptr [DI][LD_FS_FreeSectors]+2, dx mov ax, word ptr [SI][FS_MAT_FirstFreeSector] mov dx, word ptr [SI][FS_MAT_FirstFreeSector]+2 mov word ptr [DI][LD_FS_FirstFreeSector], ax mov word ptr [DI][LD_FS_FirstFreeSector]+2, dx mov si, di mov ax, word ptr [SI][LD_FS_RootDirD] mov dx, word ptr [SI][LD_FS_RootDirD]+2 add ax, word ptr [SI][LD_FS_BeginSector] adc dx, word ptr [SI][LD_FS_BeginSector]+2 read_hd_RDT_sector_again: ;mov bx, offset DOSBootSectorBuff mov cx, 1 call proc_disk_read jc pass_this_is_Singlix_FS_disk mov si, bx use_hdfs_RDT_sector_params: mov ax, word ptr [SI][FS_RDT_VolumeSerialNo] mov dx, word ptr [SI][FS_RDT_VolumeSerialNo]+2 mov word ptr [DI][LD_FS_VolumeSerial], ax mov word ptr [DI][LD_FS_VolumeSerial]+2, dx push di mov cx, 32 add si, FS_RDT_VolumeName add di, LD_FS_VolumeName rep movsw pop si inc byte ptr [Last_DOS_DiskNo] mov al, 'A' add al, byte ptr [Last_DOS_DiskNo] mov byte ptr [SI][LD_FS_Name], al mov byte ptr [SI][LD_FS_MediaChanged],1 ; What for !? pop di add di, 100h push di jmp pass_this_is_Singlix_FS_disk pass_singlix_fd_hd_validation_check: cmp byte ptr [SI][BPB_Media], 0F8h jne pass_this_is_FAT32_LBA_disk cmp word ptr [SI][BPB_FATSz16], 0 ja short pass_FAT32_BPB cmp byte ptr [SI][BS_FAT32_BootSig], 29h jne pass_this_is_FAT32_LBA_disk mov cx, 45 jmp short loc_move_hd_BPB pass_FAT32_BPB: cmp byte ptr [SI][BS_BootSig], 29h jne pass_this_is_FAT32_LBA_disk mov cx, 32 loc_move_hd_BPB: pop di push di push di add di, LD_BPB rep movsw pop si pop di add di, 100h push di inc byte ptr [Last_DOS_DiskNo] mov al, 'A' add al, byte ptr [Last_DOS_DiskNo] mov byte ptr [SI][LD_Name], al cmp byte ptr [Now_EP_Drives], 0 jna short ld_StartSector_set1 cmp byte ptr [SI][LD_FsType], 0Bh jne short ld_StartSector_set1 mov ax, word ptr [SI][LD_StartSector] mov dx, word ptr [SI][LD_StartSector]+2 jmp short ld_StartSector_set2 ld_StartSector_set1: mov AX,Word Ptr [SI][LD_BPB][Hidden1] mov DX,Word Ptr [SI][LD_BPB][Hidden2] mov word ptr [SI][LD_StartSector],AX mov word ptr [SI][LD_StartSector]+2,DX ld_StartSector_set2: add AX,Word Ptr [SI][LD_BPB][ResSectors] adc DX,0 mov Word Ptr [SI][LD_FATBegin], AX mov Word Ptr [SI][LD_FATBegin]+2, DX cmp byte ptr [SI][LD_FATType], 3 jne short pass_FAT32_RootDirLoc mov ax, Word Ptr [SI][LD_BPB][FAT32_FAT_Size] mov dx, Word Ptr [SI][LD_BPB][FAT32_FAT_Size]+2 xor bh,bh mov bl,Byte Ptr [SI][LD_BPB][FATs] call proc_mul32 add ax, Word Ptr [SI][LD_FATBegin] adc dx, Word Ptr [SI][LD_FATBegin]+2 mov Word Ptr [SI][LD_DATABegin], AX mov Word Ptr [SI][LD_DATABegin]+2, DX mov Word Ptr [SI][LD_ROOTBegin], AX mov Word Ptr [SI][LD_ROOTBegin]+2, DX jmp short pass_FAT_FS_Locations pass_FAT32_RootDirLoc: mov AL,Byte Ptr [SI][LD_BPB][FATs] cbw mul Word Ptr [SI][LD_BPB][FATSecs] add AX,Word Ptr [SI][LD_FATBegin] adc DX,Word Ptr [SI][LD_FATBegin]+2 mov Word Ptr [SI][LD_ROOTBegin], AX mov Word Ptr [SI][LD_ROOTBegin]+2, DX mov Word Ptr [SI][LD_DATABegin], AX mov Word Ptr [SI][LD_DATABegin]+2, DX mov AX,20h ; Size of a directory entry mul Word Ptr [SI][LD_BPB][RootDirEnts] add AX,511 ; adc dx, 0 mov cx, 512 div cx add Word Ptr [SI][LD_DATABegin],AX adc Word Ptr [SI][LD_DATABegin]+2,0 pass_FAT_FS_Locations: mov ax,Word Ptr [SI][LD_BPB][HugeSec1] mov Word Ptr [SI][LD_TotalSectors], AX mov dx,Word Ptr [SI][LD_BPB][HugeSec2] mov Word Ptr [SI][LD_TotalSectors]+2, dx add ax,Word Ptr [SI][LD_StartSector] adc dx,Word Ptr [SI][LD_StartSector]+2 sub ax,Word Ptr [SI][LD_DATABegin] sbb dx,Word Ptr [SI][LD_DATABegin]+2 xor ch,ch mov cl,Byte Ptr [SI][LD_BPB][SecPerClust] call Rx_Dos_Div32 mov word ptr [SI][LD_Clusters], AX mov word ptr [SI][LD_Clusters]+2, DX ; Maximum Valid Cluster Number= DX:AX +1 ; with 2 reserved clusters= DX:AX +2 ;mov word ptr [SI][LD_FreeSectors],0 ;mov word ptr [SI][LD_FreeSectors]+2,0 call get_free_FAT_sectors jc pass_this_is_FAT32_LBA_disk inc byte ptr [Last_DOS_DiskNo] mov al, 'A' add al, byte ptr [Last_DOS_DiskNo] mov byte ptr [SI][LD_FS_Name], al jmp pass_this_is_FAT32_LBA_disk pass_this_is_FAT16_LBA_disk: cmp byte ptr [SI][ptFileSystemName], 0Bh jne short pass_this_is_FAT32_CHS_disk mov byte ptr [DI][LD_DiskType], 2 mov bl, byte ptr [Hard_Disk] mov byte ptr [DI][LD_PhyDrvNo], bl mov byte ptr [DI][LD_FATType], 3 mov byte ptr [DI][LD_FSType], 0Bh sub bl, 80h xor bh, bh mov ah, byte ptr [HD_LBAYes][BX] mov byte ptr [DI][LD_LBAYes],ah mov byte ptr [DI][LD_PartitionEntry],al mov ah, bl add ah, 2 mov byte ptr [DI][LD_DParamEntry], ah mov ax, word ptr [SI][ptStartSector] mov dx, word ptr [SI][ptStartSector]+2 cmp byte ptr [Now_EP_Drives],0 jna short pass_0Bh_ext_part_start_fixup shl bl, 1 shl bl, 1 add ax, word ptr [Val_StartSector][BX] adc dx, word ptr [Val_StartSector][BX]+2 mov word ptr [DI][LD_StartSector], ax mov word ptr [DI][LD_StartSector]+2, dx pass_0Bh_ext_part_start_fixup: push ax mov ah, byte ptr [Hard_Disk] sub ah, 7Eh mov al, 40h mul ah add ax, offset Disk_fd0 mov di, ax pop ax cmp byte ptr [DI][DAP_PacketSize], 10h jne pass_this_is_FAT32_LBA_disk mov word ptr [DI][DAP_LBA_Address], ax mov word ptr [DI][DAP_LBA_Address]+2, dx jmp short loc_fixup_8GB_CHS_to_LBA pass_val_startsec_check: mov dh, byte ptr [SI][ptBeginHead] mov cx, word ptr [SI][ptBeginSector] mov ax, 0201h ; Read 1 sector mov bx, offset DOSBootSectorBuff int 13h jc pass_this_is_FAT32_LBA_disk jmp hdp_boot_validation pass_this_is_FAT32_CHS_disk: cmp byte ptr [SI][ptFileSystemName], 0Ch jne check_this_is_Singlix_FS_disk mov byte ptr [DI][LD_DiskType], 2 mov ah, byte ptr [Hard_Disk] mov byte ptr [DI][LD_PhyDrvNo], ah mov byte ptr [DI][LD_FATType], 3 mov byte ptr [DI][LD_FSType], 0Ch mov byte ptr [DI][LD_LBAYes], 1 mov byte ptr [DI][LD_PartitionEntry],al sub ah, 7Eh mov byte ptr [DI][LD_DParamEntry], ah mov al, 40h mul ah add ax, offset Disk_fd0 mov di, ax cmp byte ptr [DI][DAP_PacketSize], 10h jne pass_this_is_FAT32_LBA_disk push word ptr [SI][ptStartSector] pop word ptr [DI][DAP_LBA_Address] push word ptr [SI][ptStartSector]+2 pop word ptr [DI][DAP_LBA_Address]+2 loc_fixup_8GB_CHS_to_LBA: mov word ptr [DI][DAP_Destination], offset DOSBootSectorBuff push ds pop word ptr [DI][DAP_Destination]+2 mov byte ptr [DI][DAP_NumOfBlocks],1 push di pop si add si, DAP_PacketSize ; DS:SI= DAP Location mov ah, 42h ; Extended Disk Read - LBA Read mov dl, byte ptr [Hard_Disk] int 13h jnc hdp_boot_validation pass_this_is_FAT32_LBA_disk: ; 7/6/2009 pass_this_is_Singlix_FS_disk: pop di pop ax pop cx pop si add si, 10h inc al dec cx cmp cx, 0 ja ldrv_init_next_hdp cmp byte ptr [Hard_Disk], 83h jnb short pass_init_primary_dos_partitions mov cx, 4 inc byte ptr [Hard_Disk] jmp ldrv_init_next_hdp pass_init_primary_dos_partitions: cmp byte ptr [Now_EP_Drives], 0 ja short loc_drv_init_retn mov byte ptr [Now_EP_Drives], 1 mov si, offset PTable_ep0 mov byte ptr [Hard_Disk], 80h mov ah, byte ptr [Last_DOS_DiskNo] inc ah xor al,al mov di, offset Logical_DOSDisks add di, ax mov al, 16 mov cx, 4 jmp ldrv_init_next_hdp check_this_is_Singlix_FS_disk: ; 7/6/2009 SINGLIX FS Extensions to TR-DOS DRV_INIT cmp byte ptr [SI][ptFileSystemName], 0A1h jne short pass_this_is_Singlix_FS_disk mov byte ptr [DI][LD_FS_DiskType], 2 mov ah, byte ptr [Hard_Disk] mov byte ptr [DI][LD_FS_PhyDrvNo], ah ;mov byte ptr [DI][LD_FS_FATType], 0 mov byte ptr [DI][LD_FS_FSType], 0A1h ;mov byte ptr [DI][LD_FS_LBAYes], 1 mov byte ptr [DI][LD_PartitionEntry],al sub ah, 7Eh mov byte ptr [DI][LD_DParamEntry], ah mov al, 40h mul ah add ax, offset Disk_fd0 mov di, ax cmp byte ptr [DI][DAP_PacketSize], 10h jne pass_this_is_FAT32_LBA_disk push word ptr [SI][ptStartSector] pop word ptr [DI][DAP_LBA_Address] push word ptr [SI][ptStartSector]+2 pop word ptr [DI][DAP_LBA_Address]+2 jmp loc_fixup_8GB_CHS_to_LBA Now_EP_Drives: db 0 Val_StartSector: dd 0 dd 0 dd 0 dd 0 loc_drv_init_retn: retn proc_drv_init endp proc_dparam proc near ; input ; dl = Disk Drive Number ; ds:si = Parameters Table Buffer ; output ; ah = error number (0 = No Error if C flag is ZERO) mov byte ptr [si][DPDiskNumber], dl mov byte ptr [si][DPDType], 0 push dx mov ah, 08h int 13h mov byte ptr [si][DPReturn], ah jnc short dparam_no_error pop dx retn dparam_no_error: mov byte ptr [si][DPDType], bl mov byte ptr [si][DPDisks], dl inc dh mov byte ptr [si][DPHeads], dh push cx and cl, 3Fh mov byte ptr [si][DPSecPerTrack], cl pop cx shr cl,1 shr cl,1 shr cl,1 shr cl,1 shr cl,1 shr cl,1 xchg ch,cl inc cx mov word ptr [si][DPCylinders], cx mov word ptr [si][DPTableOff], di push es pop word ptr [si][DPTableSeg] cmp byte ptr [si][DPDiskNumber], 80h jb short dparam_15h_return mov dl, byte ptr [si][DPDiskNumber] mov byte ptr [Hard_Disk], dl mov byte ptr [si][DPDType], 0 mov ah, 15h int 13h jc short dparam_15h_return mov byte ptr [si][DPDType], ah mov word ptr [si][DPNumOfSecs], cx mov word ptr [si][DPNumOfSecs]+2, dx dparam_15h_return: pop dx ; dl = Drive Number mov byte ptr [SI][DAP_PacketSize], 0 ; Reset (No DAP) mov ah, 41h ; Check Extensions Present mov bx, 55AAh int 13h jc short dparam_48h_return cmp bx, 0AA55h jne short dparam_48h_return test cx, 01h ; Fixed Disk Access Subset - is LBA ready ? jz short dparam_48h_return xor bh,bh mov bl, byte ptr [Hard_Disk] sub bl, 80h mov byte ptr [HD_LBAYes][BX],1 mov byte ptr [SI][DAP_PacketSize], 10h dparam_41h_return: push si add si, GetDParams_48h mov word ptr [SI], 0026 ; GDP Data Lenght - Set ; DS:SI= Address of Result Buffer ; DL (Drive Number) must be not changed before here... mov ah, 48h ; Get Enhanced Disk Drive Parameters int 13h pop si jc short dparam_48h_return mov word ptr [SI][GetDParams_48h], 0 ; GDP Data Lenght - Reset dparam_48h_return: xor ah,ah retn proc_dparam endp proc_load_masterboot proc near ; input -> dl = drive number xor ah,ah int 13h jnc short pass_reset_error harddisk_error: retn pass_reset_error: mov bx, offset MasterBootBuff mov ax,0201h mov cx,1 xor dh,dh push ds pop es int 13h jc short harddisk_error cmp word ptr [MBIDCode],0AA55h jnz short loc_not_masterboot retn loc_not_masterboot: stc retn proc_load_masterboot endp get_free_FAT_sectors proc near ; INPUT: DS:SI = Logical DOS Drv Parameters Table ; OUTPUT: STC => Error ; clc and DX:AX = Free FAT sectors ; Also, related parameters and FAT buffer will be reset and updated ; Erdogan Tan, 21-06-2009 mov ax, word ptr [SI][LD_BPB][BPB_HiddSec] mov dx, word ptr [SI][LD_BPB][BPB_HiddSec]+2 add ax, word ptr [SI][LD_BPB][BPB_RsvdSecCnt] adc dx, 0 push dx push ax mov al, byte ptr [SI][LD_BPB][BPB_NumFATs] cbw mul word ptr [SI][LD_BPB][BPB_FATSz16] pop cx add ax, cx pop cx adc dx, cx push dx push ax mov ax, 20h ; Size of a directory entry mul word ptr [SI][LD_BPB][BPB_RootEntCnt] add ax, 511 ;adc dx, 0 mov cx, 512 div cx pop cx add ax, cx pop dx adc dx, 0 mov cx, word ptr [SI][LD_BPB][BPB_TotalSec16] cmp cx, 0 jna short pass_gfc_use_TotalSec16 sub ax, cx sbb dx, 0 jmp short pass_gfc_use_TotalSec32 pass_gfc_use_TotalSec16: mov cx, word ptr [SI][LD_BPB][BPB_TotalSec32] sub ax, cx mov cx, word ptr [SI][LD_BPB][BPB_TotalSec32]+2 sbb dx, cx pass_gfc_use_TotalSec32: xor ch, ch mov cl, byte ptr [SI][LD_BPB][BPB_SecPerClust] call Rx_Dos_Div32 mov word ptr [SI][LD_Clusters], ax mov word ptr [SI][LD_Clusters]+2, dx cmp byte ptr [SI][LD_FATType], 2 jna short loc_gfc_get_fat_free_clusters mov ax, word ptr [SI][LD_StartSector] mov dx, word ptr [SI][LD_StartSector]+2 add ax, word ptr [SI][LD_BPB][FAT32_FSInfoSec] adc dx, 0 ;push ds ;pop es mov bx, offset DOSBootSectorBuff mov cx, 1 call proc_disk_read jnc short loc_gfc_check_fsinfo_signs retn_gfc_get_fsinfo_sec: retn retn_gfc_get_fsinfo_stc: stc retn loc_gfc_check_FSINFO_signs: cmp word ptr [DOSBootSectorBuff], 5252h jne short retn_gfc_get_fsinfo_stc mov word ptr [DOSBootSectorBuff]+2, 4161h jne short retn_gfc_get_fsinfo_stc mov bx, offset DOSBootSectorBuff add bx, 484 cmp word ptr [BX], 7272h jne short retn_gfc_get_fsinfo_stc cmp word ptr [BX]+2, 6141h jne short retn_gfc_get_fsinfo_stc add bx, 4 push word ptr [BX] pop ax push word ptr [BX]+2 pop dx ;mov word ptr [SI][LD_FreeSectors], ax ;mov word ptr [SI][LD_FreeSectors]+2, dx jmp short retn_from_get_free_fat32_clusters loc_gfc_get_fat_free_clusters: or dx, dx jnz short retn_gfc_get_fsinfo_stc mov ax, 2 mov word ptr [FAT_CurrentCluster], ax mov word ptr [FAT_CurrentCluster]+2, dx gfc_allocate_FAT_buffer: mov byte ptr [FAT_BuffValidData], 0 mov byte ptr [FAT_BuffDrvName], 0 mov word ptr [FAT_BuffSector], 0 mov word ptr [FAT_BuffSector]+2, 0 mov bx, word ptr [FAT_Buffer] cmp bx, 0 ja short gfc_pass_allocate_FAT_buffer ; bx = 0 => Allocate the first free segment mov cx, 1536 ; FAT Buffer contains 3 FAT sectors mov ax, 0103h ; Buffer, AL= 3, buffer allocation call proc_allocate_memory jc short pass_get_free_sectors_calc mov word ptr [FAT_Buffer], bx gfc_pass_allocate_FAT_buffer: mov es, bx xor bx, bx read_gfc_FAT_sectors_again: mov ax, word ptr [SI][LD_BPB][BPB_HiddSec] mov dx, word ptr [SI][LD_BPB][BPB_HiddSec]+2 add ax, word ptr [SI][LD_BPB][BPB_RsvdSecCnt] adc dx, 0 mov cx, 3 call proc_disk_read jnc short loc_gfc_FAT_start push ds pop es pass_get_free_sectors_calc: retn loc_gfc_FAT_start: xor ax, ax mov word ptr [SI][LD_FreeSectors], ax mov word ptr [SI][LD_FreeSectors]+2, ax mov ax, word ptr [FAT_CurrentCluster] mov dx, word ptr [FAT_CurrentCluster]+2 loc_gfc_loop_get_next_cluster: call proc_get_next_cluster jnc short loc_gfc_free_fat_clusters_cont cmp ax, 0 jna short loc_gfc_pass_inc_free_cluster_count retn_from_get_free_fat_clusters: mov ax, word ptr [SI][LD_FreeSectors] mov dx, word ptr [SI][LD_FreeSectors]+2 retn_from_get_free_fat32_clusters: xor bh, bh mov bl, byte ptr [SI][LD_BPB][BPB_SecPerClust] call proc_Mul32 mov word ptr [SI][LD_FreeSectors], ax mov word ptr [SI][LD_FreeSectors]+2, dx push ds pop es retn loc_gfc_free_fat_clusters_cont: cmp ax, 0 ja short loc_gfc_pass_inc_free_cluster_count inc word ptr [SI][LD_FreeSectors] loc_gfc_pass_inc_free_cluster_count: mov ax, word ptr [FAT_CurrentCluster] mov dx, word ptr [FAT_CurrentCluster]+2 cmp dx, word ptr [SI][LD_Clusters]+2 ja short short retn_from_get_free_fat_clusters jb short pass_gfc_last_cluster_ax_check cmp ax, word ptr [SI][LD_Clusters] ja short short retn_from_get_free_fat_clusters pass_gfc_last_cluster_ax_check: add ax, 1 adc dx, 0 mov word ptr [FAT_CurrentCluster], ax mov word ptr [FAT_CurrentCluster]+2, dx jmp short loc_gfc_loop_get_next_cluster get_free_FAT_sectors endp floppy_drv_init proc near ; 6-6-2009 ; INPUT -> dl = Drive Number (0,1) ; OUTPUT -> al = drive name, ; ah = drive number mov byte ptr [fd_init_drv], dl mov si, offset Disk_fd0 mov di, offset Logical_DOSDisks xor dh, dh test dl, dl jz short pass_drv_init_fd1 add si, 40h add di, 100h pass_drv_init_fd1: mov byte ptr [DI][LD_MediaChanged],0 cmp byte ptr [SI][DPDType], 1 jb short read_fd_boot_sector_retn read_fd_boot_sector: push ds pop es mov cx, 4 ; Retry Count read_fd_boot_sector_again: push cx mov cx, 1 mov ax, 0201h ; Read 1 sector mov bx, offset DOSBootSectorBuff int 13h pop cx jnc short use_fd_boot_sector_params loop read_fd_boot_sector_again read_fd_boot_sector_stc_retn: stc read_fd_boot_sector_retn: retn use_fd_boot_sector_params: ;mov si, offset DOSBootSectorBuff mov si, bx cmp word ptr [SI][BS_Validation], 0AA55h jne short read_fd_boot_sector_stc_retn cmp word ptr [SI][bs_FS_Identifier], 'SF' jne pass_use_fsfd_boot_sector_params mov al, byte ptr [SI][bs_FS_LBA_Ready] mov byte ptr [DI][LD_FS_LBAYes], al mov ax, word ptr [SI][bs_FS_BytesPerSec] mov word ptr [DI][LD_FS_BytesPerSec], ax mov ax, word ptr [SI][bs_FS_MediaAttrib] mov word ptr [DI][LD_FS_MediaAttrib], ax mov ax, word ptr [SI][bs_FS_SecPerTrack] mov word ptr [DI][LD_FS_SecPerTrack], ax mov ax, word ptr [SI][bs_FS_UnDelDirD] mov dx, word ptr [SI][bs_FS_UnDelDirD]+2 mov word ptr [DI][LD_FS_UnDelDirD], ax mov word ptr [DI][LD_FS_UnDelDirD]+2, dx mov ax, word ptr [SI][bs_FS_MATLocation] mov dx, word ptr [SI][bs_FS_MATLocation]+2 mov word ptr [DI][LD_FS_MATLocation], ax mov word ptr [DI][LD_FS_MATLocation]+2, dx mov ax, word ptr [SI][bs_FS_RootDirD] mov dx, word ptr [SI][bs_FS_RootDirD]+2 mov word ptr [DI][LD_FS_RootDirD], ax mov word ptr [DI][LD_FS_RootDirD]+2, dx mov ax, word ptr [SI][bs_FS_BeginSector] mov dx, word ptr [SI][bs_FS_BeginSector]+2 mov word ptr [DI][LD_FS_BeginSector], ax mov word ptr [DI][LD_FS_BeginSector]+2, dx mov ax, word ptr [SI][bs_FS_VolumeSize] mov dx, word ptr [SI][bs_FS_VolumeSize]+2 mov word ptr [DI][LD_FS_VolumeSize], ax mov word ptr [DI][LD_FS_VolumeSize]+2, dx mov al, byte ptr [SI][bs_FS_SecPerTrack] cbw mov word ptr [DI][LD_BPB][BPB_SecPerTrk], ax mov al, byte ptr [SI][bs_FS_Heads] mov word ptr [DI][LD_BPB][BPB_NumHeads], ax mov si, di mov ax, word ptr [SI][LD_FS_MATLocation] mov dx, word ptr [SI][LD_FS_MATLocation]+2 read_fd_MAT_sector_again: ;mov bx, offset DOSBootSectorBuff mov cx, 1 call proc_disk_read mov si, bx jnc short use_fdfs_mat_sector_params retn ;jc short read_fd_boot_sector_retn use_fdfs_mat_sector_params: mov ax, word ptr [SI][FS_MAT_DATLocation] mov dx, word ptr [SI][FS_MAT_DATLocation]+2 mov word ptr [DI][LD_FS_DATLocation], ax mov word ptr [DI][LD_FS_DATLOcation]+2, dx mov ax, word ptr [SI][FS_MAT_DATScount] mov dx, word ptr [SI][FS_MAT_DATScount]+2 mov word ptr [DI][LD_FS_DATSectors], ax mov word ptr [DI][LD_FS_DATSectors]+2, dx mov ax, word ptr [SI][FS_MAT_FreeSectors] mov dx, word ptr [SI][FS_MAT_FreeSectors]+2 mov word ptr [DI][LD_FS_FreeSectors], ax mov word ptr [DI][LD_FS_FreeSectors]+2, dx mov ax, word ptr [SI][FS_MAT_FirstFreeSector] mov dx, word ptr [SI][FS_MAT_FirstFreeSector]+2 mov word ptr [DI][LD_FS_FirstFreeSector], ax mov word ptr [DI][LD_FS_FirstFreeSector]+2, dx mov si, di mov ax, word ptr [SI][LD_FS_RootDirD] mov dx, word ptr [SI][LD_FS_RootDirD]+2 read_fd_RDT_sector_again: ;mov bx, offset DOSBootSectorBuff mov cx, 1 call proc_disk_read mov si, bx jnc short use_fdfs_RDT_sector_params retn ;jc read_fd_boot_sector_retn use_fdfs_RDT_sector_params: mov ax, word ptr [SI][FS_RDT_VolumeSerialNo] mov dx, word ptr [SI][FS_RDT_VolumeSerialNo]+2 mov word ptr [DI][LD_FS_VolumeSerial], ax mov word ptr [DI][LD_FS_VolumeSerial]+2, dx push di mov cx, 32 add si, FS_RDT_VolumeName add di, LD_FS_VolumeName rep movsw pop si mov byte ptr [SI][LD_FATType], 0 mov byte ptr [SI][LD_FSType], 0A1h jmp loc_cont_use_fd_boot_sector_params pass_use_fsfd_boot_sector_params: cmp byte ptr [SI][BS_BootSig], 29h jne read_fd_boot_sector_stc_retn cmp byte ptr [SI][BPB_Media], 0F0h jb read_fd_boot_sector_retn push di add di, LD_BPB mov cx, 32 rep movsw pop si xor ax, ax mov Word Ptr [SI][LD_StartSector], AX mov Word Ptr [SI][LD_StartSector]+2,AX mov AX,Word Ptr [SI][LD_BPB][BPB_RsvdSecCnt] mov Word Ptr [SI][LD_FATBegin], AX mov Word Ptr [SI][LD_FATBegin]+2, 0 mov AL,Byte Ptr [SI][LD_BPB][BPB_NumFATs] cbw mul Word Ptr [SI][LD_BPB][BPB_FATSz16] add AX,Word Ptr [SI][LD_FATBegin] mov Word Ptr [SI][LD_ROOTBegin], AX mov Word Ptr [SI][LD_ROOTBegin]+2, 0 mov Word Ptr [SI][LD_DATABegin], AX mov Word Ptr [SI][LD_DATABegin]+2, 0 mov AX,20h ; Size of a directory entry mul Word Ptr [SI][LD_BPB][BPB_RootEntCnt] add AX,511 mov cx,512 div cx add Word Ptr [SI][LD_DATABegin], AX adc Word Ptr [SI][LD_DATABegin]+2, 0 mov AX,Word Ptr [SI][LD_BPB][BPB_TotalSec16] mov Word Ptr [SI][LD_TotalSectors], AX mov Word Ptr [SI][LD_TotalSectors]+2,0 sub ax,Word Ptr [SI][LD_DATABegin] xor dx,dx xor ch,ch mov cl,Byte Ptr [SI][LD_BPB][BPB_SecPerClust] div cx mov word ptr [SI][LD_Clusters], AX mov word ptr [SI][LD_Clusters]+2, 0 ; Maximum Valid Cluster Number= AX +1 ; with 2 reserved clusters= AX +2 allocate_FAT12_buffer: mov byte ptr [FAT_BuffValidData], 0 mov byte ptr [FAT_BuffDrvName], 0 mov word ptr [FAT_BuffSector], 0 mov word ptr [FAT_BuffSector]+2, 0 mov bx, word ptr [FAT_Buffer] cmp bx, 0 ja short pass_allocate_FAT12_buffer ; bx = 0 => Allocate the first free segment mov cx, 1536 ; FAT Buffer contains 3 FAT sectors mov ax, 0103h ; Buffer, AL= 3, buffer allocation call proc_allocate_memory jc read_fd_boot_sector_retn mov word ptr [FAT_Buffer], bx pass_allocate_FAT12_buffer: mov es, bx xor bx, bx read_fd_FAT_sectors_again: mov ax, word ptr [SI][LD_BPB][BPB_RsvdSecCnt] xor dx, dx mov cx, 3 call proc_disk_read jnc short use_fd_FAT_sectors push ds pop es retn use_fd_FAT_sectors: call fd_init_calculate_free_clusters push ds pop es jnc short loc_cont_use_fd_boot_sector_params_FAT test ax, ax jz short loc_cont_use_fd_boot_sector_params_FAT stc retn loc_cont_use_fd_boot_sector_params_FAT: mov byte ptr [SI][LD_FATType], 1 mov byte ptr [SI][LD_FSType], 1 loc_cont_use_fd_boot_sector_params: mov al, byte ptr [fd_init_drv] mov byte ptr [SI][LD_DParamEntry], al mov byte ptr [SI][LD_PhyDrvNo], al mov ah, al add al, 'A' mov byte ptr [SI][LD_Name], al mov byte ptr [SI][LD_DiskType], 1 mov byte ptr [SI][LD_LBAYes], 0 mov byte ptr [SI][LD_PartitionEntry], 0 mov byte ptr [SI][LD_MediaChanged], 1 retn fd_init_calculate_free_clusters: mov ax, word ptr [SI][LD_BPB][BPB_RsvdSecCnt] push ax mov al, byte ptr [SI][LD_BPB][BPB_NumFATs] cbw mul word ptr [SI][LD_BPB][BPB_FATSz16] pop dx add dx, ax push dx mov ax, 20h ; Size of a directory entry mul word ptr [SI][LD_BPB][BPB_RootEntCnt] add ax, 511 mov cx, 512 div cx pop dx add dx, ax mov ax, word ptr [SI][LD_BPB][BPB_TotalSec16] sub ax, dx xor dx, dx xor ch, ch mov cl, byte ptr [SI][LD_BPB][BPB_SecPerClust] div cx mov word ptr [SI][LD_Clusters], ax ; Clusters mov ax, 2 ; mov dx, 0 xor dx, dx mov word ptr [FAT_CurrentCluster]+2, dx fd_init_loop_get_next_cluster: call fd_init_get_next_cluster jnc short fd_init_free_fat_clusters cmp ax, 0 jna short fd_init_pass_inc_free_cluster_count retn_from_fd_init_calculate_free_clusters: mov ax, word ptr [SI][LD_FreeSectors] xor ch, ch mov cl, byte ptr [SI][LD_BPB][BPB_SecPerClust] mul cx mov word ptr [SI][LD_FreeSectors], ax retn fd_init_free_fat_clusters: cmp ax, 0 ja short fd_init_pass_inc_free_cluster_count inc word ptr [SI][LD_FreeSectors] fd_init_pass_inc_free_cluster_count: mov ax, word ptr [FAT_CurrentCluster] mov dx, word ptr [FAT_CurrentCluster]+2 cmp ax, word ptr [SI][LD_Clusters] ja short short retn_from_fd_init_calculate_free_clusters inc ax jmp short fd_init_loop_get_next_cluster fd_init_get_next_cluster: mov word ptr [FAT_CurrentCluster], ax mov bx, 400h ;1024 div bx ; AX = Count of 3 FAT sectors ; DX = Buffer Entry Offset push ax mov ax, 3 mul dx ; Multiply by 3 shr ax, 1 ; Divide by 2 mov dx, ax pop ax push dx mov bx, 3 mul bx pop bx ; Buffer Byte Offset ; AX = FAT Beginning Sector ; DX = 0 mov cl, byte ptr [SI][LD_Name] cmp byte ptr [FAT_BuffValidData], 0 jna load_FAT_sectors0 cmp cl, byte ptr [FAT_BuffDrvName] jne load_FAT_sectors0 cmp ax, word ptr [FAT_BuffSector] jne load_FAT_sectors1 mov ax, word ptr [FAT_CurrentCluster] shr ax, 1 mov ax, word ptr [FAT_Buffer][BX] jnc get_FAT12_nc_even shr ax, 1 shr ax, 1 shr ax, 1 shr ax, 1 fd_init_gnc_eoc_check: cmp al, 0F6h jna short fd_init_pass_gnc_eoc_check cmp ah, 0Fh jb short fd_init_pass_gnc_eoc_check xor ax, ax stc retn fd_init_pass_gnc_eoc_check: clc retn fd_init_gnc_even: and ah,0Fh jmp short fd_init_gnc_eoc_check fd_init_load_FAT_sectors0: mov byte ptr [FAT_BuffDrvName], cl fd_init_load_FAT_sectors1: mov word ptr [FAT_BuffSector]+2, dx mov word ptr [FAT_BuffSector], ax add ax, word ptr [SI][LD_FATbegin] ;adc dx, word ptr [SI][LD_FATbegin]+2 ;xor dx, dx mov bx, word ptr [FAT_Buffer] mov es, bx xor bx, bx mov cx, word ptr [SI][LD_BPB][FATsecs] sub cx, word ptr [FAT_BuffSector] and cx, 03h call proc_disk_read jnc short fd_init_FAT_sectors_no_load_error mov byte ptr [FAT_BuffValidData], 0 mov ax, 1 ; Read Error ;mov dx, 0 ;xor dx, dx retn fd_init_FAT_sectors_no_load_error: mov byte ptr [FAT_BuffValidData], 1 mov ax, word ptr [FAT_CurrentCluster] ;mov dx, word ptr [FAT_CurrentCluster]+2 jmp fd_init_get_next_cluster fd_init_drv: db 0 floppy_drv_init endp HDCounter: db 1 MasterBootBuff: MasterBootCode: db 1BEh dup (?) PartitionTable: db 64 dup (?) MBIDCode: dw ? PTable_Buffer: PTable_hd0: db 64 dup (0) PTable_hd1: db 64 dup (0) PTable_hd2: db 64 dup (0) PTable_hd3: db 64 dup (0) PTable_ep0: db 64 dup (0) PTable_ep1: db 64 dup (0) PTable_ep2: db 64 dup (0) PTable_ep3: db 64 dup (0) DiskParams: Disk_fd0: db 16 dup (0) DAP_fd0: db 16 dup(0) GDP_fd0: db 26 dup(0) TRDP_fd0: db 6 dup(0) Disk_fd1: db 16 dup (0) DAP_fd1: db 16 dup(0) GDP_fd1: db 26 dup(0) TRDP_fd1: db 6 dup(0) Disk_hd0: db 16 dup (0) DAP_hd0: db 16 dup(0) GDP_hd0: db 26 dup(0) TRDP_hd0: db 6 dup(0) Disk_hd1: db 16 dup (0) DAP_hd1: db 16 dup(0) GDP_hd1: db 26 dup(0) TRDP_hd1: db 6 dup(0) Disk_hd2: db 16 dup (0) DAP_hd2: db 16 dup(0) GDP_hd2: db 26 dup(0) TRDP_hd2: db 6 dup(0) Disk_hd3: db 16 dup (0) DAP_hd3: db 16 dup(0) GDP_hd3: db 26 dup(0) TRDP_hd3: db 6 dup(0) end_of_dparams_buff: DOSBootSectorBuff: db 512 dup(0) Hard_Disk: db 80h Last_DOS_DiskNo: db 0 HD_LBAYes: dd 0