Добавить F.ASM

F.ASM

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+use32
+org 0x0
+
+db 'MENUET01'
+dd 1
+dd start
+dd i_end
+dd mem_end
+dd stack_top
+dd param
+dd 0
+
+param rb 4096
+
+path rb 256
+
+drive db 0
+
+msg_confirm db 'Format floppy in FAT32? (Y/N) ',0
+
+msg_success db 10,'Formatted successfully. Press any key.',10,0
+
+msg_error db 10,'Error: '
+
+msg_invalid_path db 'Invalid path (use /fd0/1 or /fd1/1)',10,0
+
+msg_not_floppy db 'Not a 1.44 MB floppy disk',10,0
+
+msg_write_error db 'Write failed',10,0
+
+boot_sector:
+  db 0xeb,0x58,0x90
+  db 'MSWIN4.1'
+  dw 512
+  db 1
+  dw 32
+  db 2
+  dw 0
+  dw 0
+  db 0xf0
+  dw 0
+  dw 2
+  dd 0
+  dd 2880
+  dd 23
+  dd 0
+  dw 0
+  dd 2
+  dw 1
+  dw 6
+  times 12 db 0
+  db 0
+  db 0
+  db 0x29
+  dd 0x12345678 ; serial, will be set
+  db 'NO NAME    '
+  db 'FAT32   '
+  times 420 db 0x90 ; boot code nop
+  db 0x55,0xaa
+
+fs_info:
+  dd 0x41615252
+  times 480 db 0
+  dd 0x61417272
+  dd 2801 ; free clusters
+  dd 3 ; last allocated
+  times 12 db 0
+  dd 0xaa550000
+
+fat_first:
+  dd 0x0ffffff8
+  dd 0x0fffffff
+  dd 0x0fffffff
+  times 512-12 db 0
+
+sector_buffer rb 512 ; zero-filled
+
+start:
+  mov esi, param
+  call skip_spaces
+  mov edi, path
+  call copy_string
+
+  ; Parse and validate path
+  mov esi, path
+  cmp byte [esi], '/'
+  jne invalid_path
+  inc esi
+  cmp word [esi], 'fd'
+  jne invalid_path
+  add esi, 2
+  mov al, [esi]
+  sub al, '0'
+  cmp al, 0
+  jl invalid_path
+  cmp al, 1
+  jg invalid_path
+  mov [drive], al
+  inc esi
+  cmp byte [esi], '/'
+  jne invalid_path
+  inc esi
+  cmp byte [esi], '1'
+  jne invalid_path
+  inc esi
+  cmp byte [esi], 0
+  jne invalid_path
+
+  ; Set drive number in boot sector
+  mov al, [drive]
+  mov [boot_sector + 0x24], al
+
+  ; Set volume serial using system time
+  mov eax, 3
+  int 0x40
+  mov [boot_sector + 0x27], eax
+
+  ; Get file size to confirm floppy
+  mov eax, 58
+  mov ebx, 4
+  mov ecx, 0
+  mov edx, 0
+  mov edi, sector_buffer ; reuse buffer for info
+  mov ebp, path
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+  cmp dword [sector_buffer + 20], 0 ; size high
+  jnz not_floppy
+  cmp dword [sector_buffer + 16], 1474560 ; size low
+  jnz not_floppy
+
+  ; Confirm
+  mov esi, msg_confirm
+  call print_string
+  call get_key
+  or al, 0x20 ; to lowercase
+  cmp al, 'y'
+  jne exit
+
+  ; Write boot sector at 0
+  mov eax, 58
+  mov ebx, 2
+  mov ecx, 512
+  mov edx, 0
+  mov esi, 0
+  mov edi, boot_sector
+  mov ebp, path
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+
+  ; Write FSInfo at 512
+  mov edx, 512
+  mov edi, fs_info
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+
+  ; Write backup boot at 3072
+  mov edx, 3072
+  mov edi, boot_sector
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+
+  ; Write backup FSInfo at 3584
+  mov edx, 3584
+  mov edi, fs_info
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+
+  ; Write first FAT at 16384
+  mov edx, 16384
+  mov edi, fat_first
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+
+  ; Write first FAT2 at 28160
+  mov edx, 28160
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+
+  ; Zero other FAT sectors (1 to 22 for each FAT)
+  mov ecx, 22
+  mov edx, 16384 + 512 ; FAT1 start +512
+ zero_fat1:
+  push ecx
+  mov edi, sector_buffer
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+  add edx, 512
+  pop ecx
+  loop zero_fat1
+
+  mov ecx, 22
+  mov edx, 28160 + 512 ; FAT2
+ zero_fat2:
+  push ecx
+  mov edi, sector_buffer
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+  add edx, 512
+  pop ecx
+  loop zero_fat2
+
+  ; Zero data sectors (LBA 78 to 2879, position 78*512 to 2879*512)
+  mov ecx, 2802 ; data sectors
+  mov edx, 78 * 512 ; start data
+ zero_data:
+  push ecx
+  mov edi, sector_buffer
+  int 0x40
+  cmp eax, 0
+  jnz write_error
+  add edx, 512
+  pop ecx
+  loop zero_data
+
+  mov esi, msg_success
+  call print_string
+  call get_key
+  jmp exit
+
+invalid_path:
+  mov esi, msg_error
+  call print_string
+  mov esi, msg_invalid_path
+  call print_string
+  jmp exit
+
+not_floppy:
+  mov esi, msg_error
+  call print_string
+  mov esi, msg_not_floppy
+  call print_string
+  jmp exit
+
+write_error:
+  mov esi, msg_error
+  call print_string
+  mov esi, msg_write_error
+  call print_string
+  jmp exit
+
+exit:
+  mov eax, -1
+  int 0x40
+
+skip_spaces:
+  cmp byte [esi], ' '
+  jne .end
+  inc esi
+  jmp skip_spaces
+.end:
+  ret
+
+copy_string:
+  lodsb
+  stosb
+  or al, al
+  jnz copy_string
+  ret
+
+print_string:
+  lodsb
+  or al, al
+  jz .end
+  mov ah, 0
+  mov ebx, eax
+  mov eax, 63
+  mov ebx, 1
+  int 0x40
+  jmp print_string
+.end:
+  ret
+
+get_key:
+  mov eax, 2
+  int 0x40
+  shr eax, 8
+  ret
+
+i_end:
+rb 1024 ; reserve for data if needed
+
+stack_top:
+rb 4096
+
+mem_end: