- fat.asm: remove trailing whitespace.
- fat32.asm: backport the fixes from fat32.S introduced a long time ago.
- fat32.S/faty.S: use .space 12, 0 instead of the long .byte array (generates the same code, but is better readable).
- isoboot/btrt: whitespace fix only.
svn path=/trunk/; revision=70432
xor cx,cx
mov al,[BYTE bp+NumberOfFats] ; Number of fats
mul WORD [BYTE bp+SectorsPerFat] ; Times sectors per fat
- add ax,WORD [BYTE bp+HiddenSectors]
- adc dx,WORD [BYTE bp+HiddenSectors+2] ; Add the number of hidden sectors
+ add ax,WORD [BYTE bp+HiddenSectors]
+ adc dx,WORD [BYTE bp+HiddenSectors+2] ; Add the number of hidden sectors
add ax,WORD [BYTE bp+ReservedSectors] ; Add the number of reserved sectors
adc dx,cx ; Add carry bit
mov WORD [BYTE bp-DataAreaStartLow],ax ; Save the starting sector of the root directory
Reboot:
; mov si,msgAnyKey ; Press any key message
; call PutChars ; Display it
- xor ax,ax
+ xor ax,ax
int 16h ; Wait for a keypress
int 19h ; Reboot
; DX:AX has logical sector number to read
; CX has number of sectors to read
ReadSectors:
-
+
; We can't just check if the start sector is
; in the BIOS CHS range. We have to check if
; the start sector + length is in that range.
; jz PrintDiskError ; Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
- ; Good, we're here so the computer supports LBA disk access
- ; So finish the extended read
+ ; Good, we're here so the computer supports LBA disk access
+ ; So finish the extended read
mov dl,[BYTE bp+BootDrive] ; Drive number
mov ah,42h ; Int 13h, AH = 42h - Extended Read
int 13h ; Call BIOS
add bx,byte 20h ; Increment read buffer for next sector
mov es,bx
pop bx
-
+
loop ReadSectorsLBALoop ; Read next sector
- ret
+ ret
; Reads logical sectors into [ES:BX]
xchg ax,dx
xor dx,dx
div WORD [BYTE bp+SectorsPerTrack]
- xchg ax,cx
+ xchg ax,cx
div WORD [BYTE bp+SectorsPerTrack] ; Divide logical by SectorsPerTrack
inc dx ; Sectors numbering starts at 1 not 0
xchg cx,dx
; Increment read buffer for next sector
loop ReadSectorsCHSLoop ; Read next sector
- ret
+ ret
msgDiskError db 'Disk error',0dh,0ah,0
BackupBootSector:
.word 6
Reserved1:
- .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-
+ .space 12, 0
// End FAT32 Inserted Info
+
BootDrive:
.byte 0
Reserved:
jmp PrintFileNotFound
FindFile:
- mov ax, es // We didn't find it in the previous dir entry
- add ax, 2 // So lets move to the next one
+ mov ax, es // We didn't find it in the previous dir entry
+ add ax, 2 // So lets move to the next one
mov es, ax // And search again
xor di, di
mov si, offset filename
; First we have to load our extra boot code at
; sector 14 into memory at [0000:7e00h]
mov eax,0eh
- add eax,DWORD [BYTE bp+HiddenSectors] ; Add the number of hidden sectors
+ add eax,DWORD [BYTE bp+HiddenSectors] ; Add the number of hidden sectors
mov cx,1
xor bx,bx
mov es,bx ; Read sector to [0000:7e00h]
; EAX has logical sector number to read
; CX has number of sectors to read
ReadSectors:
+ push es
cmp eax,DWORD [BiosCHSDriveSize] ; Check if they are reading a sector outside CHS range
jae ReadSectorsLBA ; Yes - go to the LBA routine
; If at all possible we want to use LBA routines because
sub cx,[LBASectorsRead]
jnz ReadSectorsLBA ; Read next sector
+ pop es
ret
LBASectorsRead:
loop ReadSectorsCHSLoop ; Read next sector
- ret
+ ret
Reboot:
mov si,msgAnyKey ; Press any key message
call PutChars ; Display it
- xor ax,ax
+ xor ax,ax
int 16h ; Wait for a keypress
int 19h ; Reboot
BootSignature:
dw 0aa55h ; BootSector signature
-
+
; End of bootsector
;
add ax,2 ; So lets move to the next one
mov es,ax ; And search again
xor di,di
- mov si,filename
+ mov si,filename
mov cx,11
rep cmpsb ; Compare filenames
jz FoundFile ; If same we found it
jmp StartSearch
FoundFile:
-
; Display "Loading FreeLoader..." message
mov si,msgLoading ; Loading message
call PutChars ; Display it
LoadFatSector:
push ecx
+
+ mov bx, 9000h ; We will load it to [9000:0000h]
+ mov es, bx
+
; EAX holds logical FAT sector number
; Check if we have already loaded it
cmp eax,DWORD [FatSectorInCache]
je LoadFatSectorAlreadyLoaded
mov DWORD [FatSectorInCache],eax
- mov bx,9000h
- mov es,bx
- xor bx,bx ; We will load it to [9000:0000h]
+ xor bx,bx
mov cx,1
call ReadSectors
LoadFatSectorAlreadyLoaded:
- mov bx,9000h
- mov es,bx
pop ecx
mov eax,DWORD [es:ecx] ; Get FAT entry
and eax,0fffffffh ; Mask off reserved bits
BackupBootSector:
.word 6
Reserved1:
- .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+ .space 12, 0
#endif // FAT32
BootDrive:
; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
; USA; either version 2 of the License, or (at your option) any later
; version; incorporated herein by reference.
-;
+;
; ****************************************************************************
;
; THIS FILE IS A MODIFIED VERSION OF ISOLINUX.ASM
mov byte [TimeoutCount], 5
.next_second:
mov eax, [BIOS_timer] ; load current tick counter
- add eax, 19 ;
+ add eax, 19 ;
.poll_again:
call pollchar_and_empty
; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
; USA; either version 2 of the License, or (at your option) any later
; version; incorporated herein by reference.
-;
+;
; ****************************************************************************
;
; THIS FILE IS A MODIFIED VERSION OF ISOLINUX.ASM
projects / reactos.git / commitdiff