Subversion Repositories Kolibri OS

boot_dev  db	  0  ; 0=floppy, 1=hd

;==========================================================================

;

;                           16 BIT FUNCTIONS

;

;==========================================================================

boot_read_floppy:

	push	si

	xor	si, si

	mov	ah, 2	; read

@@:

	push	ax

	int	0x13

	pop	ax

	jnc	@f

	inc	si

	cmp	si, 10

	jnb	$

@@:

	pop	si

	ret

sayerr_plain:

sayerr:

	jmp	$

; convert abs. sector number (AX) to BIOS T:H:S

; sector number = (abs.sector%BPB_SecPerTrk)+1

; pre.track number = (abs.sector/BPB_SecPerTrk)

; head number = pre.track number%BPB_NumHeads

; track number = pre.track number/BPB_NumHeads

; Return: cl - sector number

;         ch - track number

;         dl - drive number (0 = a:)

;         dh - head number

conv_abs_to_THS:

	push	bx

	mov	bx,word [BPB_SecPerTrk]

	xor	dx,dx

	div	bx

	inc	dx

	mov	cl, dl				; cl = sector number

	mov	bx,word [BPB_NumHeads]

	xor	dx,dx

	div	bx

	; !!!!!!! ax = track number, dx = head number

	mov	ch,al				; ch=track number

	xchg	dh,dl				; dh=head number

	mov	dl,0				; dl=0 (drive 0 (a:))

	pop	bx

	retn

; needed variables

BPB_SecPerTrk	dw	0			; sectors per track

BPB_NumHeads	dw	0			; number of heads

BPB_FATSz16	dw	0			; size of FAT

BPB_RootEntCnt	dw	0			; count of root dir. entries

BPB_BytsPerSec	dw	0			; bytes per sector

BPB_RsvdSecCnt	dw	0			; number of reserved sectors

BPB_TotSec16	dw	0			; count of the sectors on the volume

BPB_SecPerClus	db	0			; number of sectors per cluster

BPB_NumFATs	db	0			; number of FAT tables

start_of_code:

	cld

; \begin{diamond}[02.12.2005]

; if bootloader sets ax = 'KL', then ds:si points to loader block

	cmp	ax, 'KL'

	jnz	@f

	mov	word [cs:cfgmanager.loader_block], si

	mov	word [cs:cfgmanager.loader_block+2], ds

@@:

; \end{diamond}[02.12.2005]

; if bootloader sets cx = 'HA' and dx = 'RD', then bx contains identifier of source hard disk

; (see comment to bx_from_load)

	cmp	cx, 'HA'

	jnz	no_hd_load

	cmp	dx,'RD'

	jnz	no_hd_load

	movzx	esp, sp

	push	0

	pop	es

	and	word [es:0x9031], 0

; \begin{Mario79}

; find HDD IDE DMA PCI device

; check for PCI BIOS

	mov	ax, 0xB101

	int	0x1A

	jc	.nopci

	cmp	edx, 'PCI '

	jnz	.nopci

; find PCI class code

; class 1 = mass storage

; subclass 1 = IDE controller

; a) class 1, subclass 1, programming interface 0x80

	mov	ax, 0xB103

	mov	ecx, 1*10000h + 1*100h + 0x80

	xor	si, si	; device index = 0

	int	0x1A

	jnc	.found

; b) class 1, subclass 1, programming interface 0x8A

	mov	ax, 0xB103

	mov	ecx, 1*10000h + 1*100h + 0x8A

	xor	si, si	; device index = 0

	int	0x1A

	jnc	.found

; c) class 1, subclass 1, programming interface 0x85

	mov	ax, 0xB103

	mov	ecx, 1*10000h + 1*100h + 0x85

	xor	si, si

	int	0x1A

	jc	.nopci

.found:

; get memory base

	mov	ax, 0xB10A

	int	0x1A

	jc	.nopci

.nopci:

; \end{Mario79}

; --------------- APM - removed--------------------

	and	word [es:0x9044], 0	; ver = 0.0 (APM not found)

 if 0

	mov	ax, 0x5300

	xor	bx, bx

	int	0x15

	jc	apm_end 		; APM not found

	test	cx, 2

	jz	apm_end 		; APM 32-bit protected-mode interface not supported

	mov	[es:0x9044], ax 	; Save APM Version

	mov	[es:0x9046], cx 	; Save APM flags

	mov	ax, 0x5304		; Disconnect interface

	xor	bx, bx

	int	0x15

	mov	ax, 0x5303		; Connect 32 bit mode interface

	xor	bx, bx

	int	0x15

	mov	[es:0x9040], ebx

	mov	[es:0x9050], ax

	mov	[es:0x9052], cx

	mov	[es:0x9054], dx

apm_end:

end if

;CHECK current of code

	cmp	[cfgmanager.loader_block], -1

	jz	noloaderblock

	les	bx, [cfgmanager.loader_block]

	cmp	byte [es:bx], 1

	jnz	sayerr

	push	0

	pop	es

noloaderblock:

;         call    print_vesa_info

;         call    calc_vmodes_table

;         call    check_first_parm  ;check and enable cursor_pos

; \begin{diamond}[30.11.2005]

cfgmanager:

; settings:

; a) preboot_graph = graphical mode

;    preboot_gprobe = probe this mode?

; b) preboot_dma  = use DMA access?

; c) preboot_vrrm = use VRR?

; d) preboot_device = from what boot?

; determine default settings

;        mov     [.bSettingsChanged], 0

;.preboot_gr_end:

	mov	di, preboot_device

; if image in memory is present and [preboot_device] is uninitialized,

; set it to use this preloaded image

	cmp	byte [di], 0

	jnz	.preboot_device_inited

	cmp	[.loader_block], -1

	jz	@f

	les	bx, [.loader_block]

	test	byte [es:bx+1], 1

	jz	@f

	mov	byte [di], 3

	jmp	.preboot_device_inited

@@:

; otherwise, set [preboot_device] to 1 (default value - boot from floppy)

	mov	byte [di], 1

.preboot_device_inited:

; following 4 lines set variables to 1 if its current value is 0

	cmp	byte [di+preboot_dma-preboot_device], 1

	adc	byte [di+preboot_dma-preboot_device], 0

	cmp	byte [di+preboot_biosdisk-preboot_device], 1

	adc	byte [di+preboot_biosdisk-preboot_device], 0

;        pop     ax              ; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ??

	jmp	.continue

.loader_block dd -1

.continue:

	sti

	jmp	 .load

	pop	ds

.load:

; ASK GRAPHICS MODE

;       call    set_vmode

	mov	[es:0x901C], byte 1

	mov	al, [preboot_dma]

	mov	[es:0x901F], al

; VRR_M USE