Nelze vybrat více než 25 témat
Téma musí začínat písmenem nebo číslem, může obsahovat pomlčky („-“) a může být dlouhé až 35 znaků.
265 řádky
9.8 KiB
265 řádky
9.8 KiB
BITS 16
|
|
%define DISK_SERVICE 0x0050:0x0256
|
|
%define KERNEL 0x0050:0x0512
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
jmp short vbr_lfsf
|
|
nop ; Used later as a FLAG byte for extended INT 13 Disk Func.'s (See instruction at: 7CADh).
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; Disk description table, to make it a valid floppy
|
|
; Note: some of these values are hard-coded in the source!
|
|
; Values are those used by IBM for 1.44 MB, 3.5" diskette
|
|
; NOTE(jakob): From MikeOS
|
|
; Why do we need this... damn BIOS
|
|
;times 71 - ($-$$) db 0
|
|
OEMLabel db "SingOs " ; Disk label
|
|
; BytesPerSector dw 512 ; Bytes per sector
|
|
; SectorsPerCluster db 1 ; Sectors per cluster
|
|
; ReservedForBoot dw 1 ; Reserved sectors for boot record
|
|
; NumberOfFats db 2 ; Number of copies of the FAT
|
|
; RootDirEntries dw 224 ; Number of entries in root dir
|
|
; ; (224 * 32 = 7168 = 14 sectors to read)
|
|
; LogicalSectors dw 0x4000 ; Number of logical sectors
|
|
; MediumByte db 0xF0 ; Medium descriptor byte
|
|
; SectorsPerFat dw 9 ; Sectors per FAT
|
|
; SectorsPerTrack dw 18 ; Sectors per track (36/cylinder)
|
|
; Sides dw 2 ; Number of sides/heads
|
|
; HiddenSectors dd 0 ; Number of hidden sectors
|
|
; LargeSectors dd 0 ; Number of LBA sectors
|
|
; DriveNo dw 0 ; Drive No: 0
|
|
; Signature db 0 ; Drive signature: 41 for floppy
|
|
; VolumeID dd 0x00000000 ; Volume ID: any number
|
|
; VolumeLabel db "SingOs "; Volume Label: any 11 chars
|
|
; FileSystem db "VSFS " ; File system type: don't change!
|
|
|
|
vbr_lfsf:
|
|
; Volume Boot Record
|
|
; This will start SingOS from the disk
|
|
; The disk format has to be LessSimpleFileSystem
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
; loading essentials for SingOS to run
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; SYSTEM CALL TABLE STARTING AT POSITION 0x0050:0x0000
|
|
; To already support 64-bit, the entries is 64-bit
|
|
; But in 16-bit, the adresses is only 16-bit
|
|
; These are stored in the first 16-bits
|
|
; There is reserved 2 sectors to the table witch means that we have room for
|
|
; 128 System Calls
|
|
; |----|----------------------------------------------------------------------------|
|
|
; | 1 | Master Table| call [0x0050:0x0000] Pointer to the Master File Table |
|
|
; |----|----------------------------------------------------------------------------|
|
|
; | 2 | FILE SYSTEM | call [0x0050:0x0008] for arguments see under the file system |
|
|
; |----|----------------------------------------------------------------------------|
|
|
; | 3 | OS_LIB | call [0x0050:0x0016] for arguments see under the file system |
|
|
; |----|----------------------------------------------------------------------------|
|
|
; | 1 | FILE SYSTEM | call [0x0050:0x0000] for arguments see under the file system |
|
|
; |----|----------------------------------------------------------------------------|
|
|
; | 2 | OS_LIB | call [0x0050:0x0008] for arguments see under the file system |
|
|
; |----|----------------------------------------------------------------------------|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
mov [vbr_disk_identifier], dl ; saving disk_identifier, this is the number the disk that we are booting from.
|
|
; This number is set by the bios
|
|
|
|
xor ax, ax
|
|
mov al, dl
|
|
|
|
mov al, [vbr_disk_identifier]
|
|
|
|
mov [vbr_lba_position_at_disk], ax ; From the MBR we need information of where we are located at the disk.
|
|
; If this fails, we could lookup our self, in the MBR where we are located.
|
|
;mov ax, 0x50
|
|
;mov cs, ax
|
|
;mov ds, ax
|
|
;mov ax, 0x8fc0
|
|
;mov ss, ax ; Set 'ss' to this location (the beginning of our stack region)
|
|
;mov sp, 0xffff ; Set 'ss:sp' to the top of our 8K stack
|
|
;mov bp, sp
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; The system has to support int13 bios extended system calls, otherwise is SingOS not supporting the hardware.
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
mov ah, 0x41 ;Set AH = 0x41
|
|
mov bx, 0x55aa ;BX = 0x55AA
|
|
mov dl, [vbr_disk_identifier] ;DL = disk_id
|
|
int 0x13 ;Issue an INT 0x13.
|
|
jc .is_not_supported
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; The system is suportted
|
|
; We are now loading the filesystem
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;mov WORD bx, [vbr_lba_position_at_disk]
|
|
mov WORD [DAPACK.lba_addr_dw_low], 89
|
|
mov WORD [DAPACK.blkcnt], 0x08 ; Read to sectors, that is what the space is for the buffer in svim
|
|
mov WORD [DAPACK.db_addr_segment], 0x50
|
|
mov WORD [DAPACK.db_addr_offset], 0x256
|
|
mov si, DAPACK ; address of "disk address packet"
|
|
mov ah, 0x42 ; READ
|
|
mov dl, [vbr_disk_identifier]
|
|
int 0x13
|
|
;call dumpax
|
|
;call DISK_SERVICE
|
|
|
|
mov [vbr_disk_identifier], dl
|
|
mov al, dl
|
|
;call DISK_SERVICE
|
|
|
|
;mov ax, 0
|
|
;mov ah, 0x10
|
|
;int 0x16
|
|
|
|
;mov ah, 0x0e
|
|
;mov al, 66 ; backspace
|
|
;int 0x10 ; print char
|
|
|
|
;call DISK_SERVICE
|
|
|
|
;mov ax, 0
|
|
;mov ah, 0x10
|
|
;int 0x16
|
|
|
|
;mov ah, 0x0e
|
|
;mov al, 66 ; backspace
|
|
;int 0x10 ; print char
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; The disk service is now loaded.
|
|
; Now we are going to load the Master table.
|
|
;
|
|
; We are now loading the filesystem
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
mov WORD [DAPACK.lba_addr_dw_low], 97
|
|
mov WORD [DAPACK.blkcnt], 0x1f
|
|
mov WORD [DAPACK.db_addr_segment], 0x50
|
|
mov WORD [DAPACK.db_addr_offset], 0x0512
|
|
mov si, DAPACK ; address of "disk address packet"
|
|
mov ah, 0x42 ; READ
|
|
mov dl, [vbr_disk_identifier]
|
|
int 0x13
|
|
|
|
;call dumpax
|
|
|
|
|
|
xor ax, ax
|
|
mov dl, [vbr_disk_identifier]
|
|
mov al, dl
|
|
;call dumpax
|
|
|
|
mov dl, [vbr_disk_identifier]
|
|
|
|
jmp KERNEL
|
|
|
|
nop
|
|
cli
|
|
hlt
|
|
|
|
.is_not_supported:
|
|
; The System does support exented read write
|
|
mov si, lsfs_disk_error_msg
|
|
;call print
|
|
|
|
;Routine for printing a 'ax' as hex
|
|
dumpax:
|
|
pusha ; save registers
|
|
mov bx, ax
|
|
mov ah, 0xE ; Teletype output
|
|
|
|
mov cx, 4 ; 4 nipples in a 16 bit word
|
|
.loop:
|
|
rol bx, 4 ; rotate to next nipple
|
|
mov al, bl ; we copy to al because we need to mask only the low 4 bits
|
|
and al, 1111b ; Do the masking
|
|
add al, '0' ; convert to ASCII
|
|
cmp al, '9' ; If we are greater than 9 ascii, we add 7 to make digit 10 be represented as 'A'
|
|
jbe .skip ; -|-
|
|
add al, 7 ; -|-
|
|
.skip: ; -|-
|
|
int 0x10 ; BIOS call 'output'
|
|
loop .loop
|
|
|
|
popa ; restore registers
|
|
ret
|
|
|
|
|
|
vbr_disk_identifier db 0
|
|
vbr_lba_position_at_disk dw 0
|
|
lsfs_disk_error_msg db 'The system does not support disk operations,', 13, 10, 0
|
|
|
|
DAPACK:
|
|
.dap_Size: db 0x10 ; This is always 16 bytes (0x10)
|
|
.rev_byte: db 0x0 ; reserved byte, should always be zero
|
|
.blkcnt: dw 0x0 ; int 13 resets this to # of blocks actually read/written
|
|
.db_addr_offset: dw 0x0 ; memory buffer destination address (0:7c00)
|
|
.db_addr_segment: dw 0x0 ; in memory page zero
|
|
.lba_addr_dw_low: dd 0x0 ; put the lba to read in this spot
|
|
.lba_addr_dw_high: dd 0x0 ; more storage bytes only for big lba's ( > 4 bytes )
|
|
|
|
times 4096-($-$$) db 0
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; HERE START THE FILE SYSTEM
|
|
; This is the Master Table
|
|
; This is the fixed entries when the system is compilet
|
|
; DEFAULT SIZE IS 64 FILES
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
; Entry one:
|
|
;.filename:
|
|
|
|
db 'LSFS v0.1.2-exp', 13, 10, '(LessSimpelFileSystem)', 13, 10, 'Developed to SingOS', 13, 10, 'by Jorn Guldberg', 13, 10, 0 ; 66 chars + 8 bytes
|
|
times 163 db 0 ; 256 bytes file system informaiton
|
|
dw 23, 0x00, 0x00, 0x00 ; offset on disk asb LBA address
|
|
dw 2306, 0x00, 0x00, 0x00 ; Next free LBA partition index free
|
|
dw 0x00, 0x00, 0x00, 0x00 ; next_sector_reuse_pointer
|
|
dw 0x00, 0x00, 0x00, 0x00 ; last_sector_index_on_partition
|
|
dw 0x00, 0x00, 0x00, 0x00 ; sectors_size_on_disk
|
|
times 208 db 0
|
|
|
|
;db 'File_System_Control_information', 0
|
|
;times 224 db 0
|
|
;.file_id:
|
|
;dw 0x0, 0x0, 0x0, 0x00 ; 64-bits
|
|
;.file_size
|
|
;dw 512, 0x0, 0x0, 0x0 ; 64-bits Should be the actual number of bytes.
|
|
;.ext_file_data 64-bits (Extended data about the file, timestamps etc.)
|
|
;dw 0x0, 0x0, 0x0, 0x0
|
|
;control_bits 64-bits
|
|
;dw 0x0, 0x0, 0x0, 0x0
|
|
;.file_data_pointers
|
|
;dw 88, 0x0, 0x0, 0x0
|
|
;times 216 db 0
|
|
|
|
; Entry Two:
|
|
db 'LessSimpelFileSystem.module', 0
|
|
times 228 db 0
|
|
;.file_id:
|
|
dw 0x01, 0x0, 0x0, 0x0
|
|
;.file_size
|
|
dw 4096, 0x0, 0x0, 0x0
|
|
;.ext_file_data 64-bits (Extended data about the file, timestamps etc.)
|
|
dw 0x0, 0x0, 0x0, 0x0
|
|
;control_bits 64-bits
|
|
dw 0x0, 0x0, 0x0, 0x0
|
|
;.file_data_pointers
|
|
dw 89, 0x0, 0x0, 0x0
|
|
times 216 db 0
|
|
|
|
; Entry Three:
|
|
db 'kernel', 0
|
|
times 249 db 0
|
|
;.file_id:
|
|
dw 0x02, 0x0, 0x0, 0x0
|
|
;.file_size
|
|
dw 0x00, 0x10, 0x0, 0x0
|
|
;.ext_file_data 64-bits (Extended data about the file, timestamps etc.)
|
|
dw 0x0, 0x0, 0x0, 0x0
|
|
;control_bits 64-bits
|
|
dw 0x0, 0x0, 0x0, 0x0
|
|
;.file_data_pointers
|
|
dw 97, 0x0, 0x0, 0x0
|
|
times 216 db 0
|
|
|
|
|
|
times 4096 + (32768-($-$$)) db 0
|