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226 wiersze
7.6 KiB
226 wiersze
7.6 KiB
BITS 16
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%define DISK_SERVICE 0x0050:0x0256
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%define KERNEL 0x0050:0x0512
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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vbr_lfsf:
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; Volume Boot Record
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; This will start SingOS from the disk
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; The disk format has to be LessSimpleFileSystem
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; loading essentials for SingOS to run
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; SYSTEM CALL TABLE STARTING AT POSITION 0x0050:0x0000
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; To already support 64-bit, the entries is 64-bit
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; But in 16-bit, the adresses is only 16-bit
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; These are stored in the first 16-bits
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; There is reserved 2 sectors to the table witch means that we have room for
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; 128 System Calls
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; |----|----------------------------------------------------------------------------|
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; | 1 | Master Table| call [0x0050:0x0000] Pointer to the Master File Table |
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; |----|----------------------------------------------------------------------------|
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; | 2 | FILE SYSTEM | call [0x0050:0x0008] for arguments see under the file system |
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; |----|----------------------------------------------------------------------------|
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; | 3 | OS_LIB | call [0x0050:0x0016] for arguments see under the file system |
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; |----|----------------------------------------------------------------------------|
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; | 1 | FILE SYSTEM | call [0x0050:0x0000] for arguments see under the file system |
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; |----|----------------------------------------------------------------------------|
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; | 2 | OS_LIB | call [0x0050:0x0008] for arguments see under the file system |
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; |----|----------------------------------------------------------------------------|
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mov [vbr_disk_identifier], dl ; saving disk_identifier, this is the number the disk that we are booting from.
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; This number is set by the bios
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xor ax, ax
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mov al, dl
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mov al, [vbr_disk_identifier]
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mov [vbr_lba_position_at_disk], ax ; From the MBR we need information of where we are located at the disk.
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; If this fails, we could lookup our self, in the MBR where we are located.
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;mov ax, 0x50
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;mov cs, ax
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;mov ds, ax
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;mov ax, 0x8fc0
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;mov ss, ax ; Set 'ss' to this location (the beginning of our stack region)
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;mov sp, 0xffff ; Set 'ss:sp' to the top of our 8K stack
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;mov bp, sp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; The system has to support int13 bios extended system calls, otherwise is SingOS not supporting the hardware.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mov ah, 0x41 ;Set AH = 0x41
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mov bx, 0x55aa ;BX = 0x55AA
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mov dl, [vbr_disk_identifier] ;DL = disk_id
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int 0x13 ;Issue an INT 0x13.
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jc .is_not_supported
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; The system is suportted
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; We are now loading the filesystem
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;mov WORD bx, [vbr_lba_position_at_disk]
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mov WORD [DAPACK.lba_addr_dw_low], 89
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mov WORD [DAPACK.blkcnt], 0x08 ; Read to sectors, that is what the space is for the buffer in svim
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mov WORD [DAPACK.db_addr_segment], 0x50
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mov WORD [DAPACK.db_addr_offset], 0x256
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mov si, DAPACK ; address of "disk address packet"
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mov ah, 0x42 ; READ
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mov dl, [vbr_disk_identifier]
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int 0x13
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;call dumpax
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;call DISK_SERVICE
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mov [vbr_disk_identifier], dl
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mov al, dl
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;call DISK_SERVICE
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;mov ax, 0
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;mov ah, 0x10
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;int 0x16
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;mov ah, 0x0e
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;mov al, 66 ; backspace
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;int 0x10 ; print char
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;call DISK_SERVICE
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;mov ax, 0
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;mov ah, 0x10
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;int 0x16
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;mov ah, 0x0e
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;mov al, 66 ; backspace
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;int 0x10 ; print char
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; The disk service is now loaded.
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; Now we are going to load the Master table.
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;
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; We are now loading the filesystem
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mov WORD [DAPACK.lba_addr_dw_low], 97
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mov WORD [DAPACK.blkcnt], 0x1f
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mov WORD [DAPACK.db_addr_segment], 0x50
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mov WORD [DAPACK.db_addr_offset], 0x0512
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mov si, DAPACK ; address of "disk address packet"
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mov ah, 0x42 ; READ
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mov dl, [vbr_disk_identifier]
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int 0x13
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;call dumpax
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xor ax, ax
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mov dl, [vbr_disk_identifier]
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mov al, dl
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;call dumpax
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mov dl, [vbr_disk_identifier]
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jmp KERNEL
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nop
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cli
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hlt
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.is_not_supported:
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; The System does support exented read write
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mov si, lsfs_disk_error_msg
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;call print
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;Routine for printing a 'ax' as hex
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dumpax:
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pusha ; save registers
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mov bx, ax
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mov ah, 0xE ; Teletype output
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mov cx, 4 ; 4 nipples in a 16 bit word
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.loop:
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rol bx, 4 ; rotate to next nipple
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mov al, bl ; we copy to al because we need to mask only the low 4 bits
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and al, 1111b ; Do the masking
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add al, '0' ; convert to ASCII
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cmp al, '9' ; If we are greater than 9 ascii, we add 7 to make digit 10 be represented as 'A'
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jbe .skip ; -|-
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add al, 7 ; -|-
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.skip: ; -|-
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int 0x10 ; BIOS call 'output'
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loop .loop
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popa ; restore registers
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ret
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vbr_disk_identifier db 0
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vbr_lba_position_at_disk dw 0
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lsfs_disk_error_msg db 'The system does not support disk operations,', 13, 10, 0
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DAPACK:
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.dap_Size: db 0x10 ; This is always 16 bytes (0x10)
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.rev_byte: db 0x0 ; reserved byte, should always be zero
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.blkcnt: dw 0x0 ; int 13 resets this to # of blocks actually read/written
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.db_addr_offset: dw 0x0 ; memory buffer destination address (0:7c00)
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.db_addr_segment: dw 0x0 ; in memory page zero
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.lba_addr_dw_low: dd 0x0 ; put the lba to read in this spot
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.lba_addr_dw_high: dd 0x0 ; more storage bytes only for big lba's ( > 4 bytes )
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times 4096-($-$$) db 0
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; HERE START THE FILE SYSTEM
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; This is the Master Table
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; This is the fixed entries when the system is compilet
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; DEFAULT SIZE IS 64 FILES
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Entry one:
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;.filename:
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db 'File_System_Control_information', 0
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times 224 db 0
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;.file_id:
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dw 0x0, 0x0, 0x0, 0x00 ; 64-bits
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;.file_size
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dw 512, 0x0, 0x0, 0x0 ; 64-bits Should be the actual number of bytes.
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;.ext_file_data 64-bits (Extended data about the file, timestamps etc.)
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dw 0x0, 0x0, 0x0, 0x0
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;control_bits 64-bits
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dw 0x0, 0x0, 0x0, 0x0
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;.file_data_pointers
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dw 88, 0x0, 0x0, 0x0
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times 216 db 0
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; Entry Two:
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db 'LessSimpelFileSystem', 0
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times 235 db 0
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;.file_id:
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dw 0x01, 0x0, 0x0, 0x0
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;.file_size
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dw 4096, 0x0, 0x0, 0x0
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;.ext_file_data 64-bits (Extended data about the file, timestamps etc.)
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dw 0x0, 0x0, 0x0, 0x0
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;control_bits 64-bits
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dw 0x0, 0x0, 0x0, 0x0
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;.file_data_pointers
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dw 89, 0x0, 0x0, 0x0
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times 216 db 0
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; Entry Three:
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db 'kernel', 0
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times 249 db 0
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;.file_id:
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dw 0x02, 0x0, 0x0, 0x0
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;.file_size
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dw 0x00, 0x10, 0x0, 0x0
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;.ext_file_data 64-bits (Extended data about the file, timestamps etc.)
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dw 0x0, 0x0, 0x0, 0x0
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;control_bits 64-bits
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dw 0x0, 0x0, 0x0, 0x0
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;.file_data_pointers
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dw 97, 0x0, 0x0, 0x0
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times 216 db 0
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times 4096 + (32768-($-$$)) db 0
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