WebSVN – Kolibri OS – Blame – /kernel/trunk/boot/bootcode.inc

Rev	Author	Line No.	Line
1	ha	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
		3	;; BOOTCODE.INC ;;
		4	;; ;;
		5	;; 16 bit bootcode for MenuetOS ;;
		6	;; ;;
		7	;; Copyright 2002 Ville Turjanmaa ;;
		8	;; ;;
		9	;; See file COPYING for details ;;
		10	;; ;;
		11	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		12
		13
		14
		15	;==========================================================================
		16	;
		17	; 16 BIT FUNCTIONS
		18	;
		19	;==========================================================================
		20
		21	print: push si
		22	mov si,leftpr-0x10000
		23	call printplain
		24	pop si
		25
		26	printplain: pusha
		27	mov dx,0x1000
		28	mov es,dx
		29	cmp byte [es:display_atboot-0x10000],2
		30	je printplain_exit
		31	mov ds,dx
		32	cld
		33	lodsb
		34	prpl1:
		35	mov ah,0xe
		36	xor bh,bh
		37	int 0x10
		38	lodsb
		39	cmp al,0
		40	jne prpl1
		41	printplain_exit:
		42	popa
		43	ret
		44
		45	setbase1000: push ax
		46	mov ax,0x1000
		47	mov es,ax
		48	mov ds,ax
		49	pop ax
		50	ret
		51
		52	getkey: push ecx
		53	push edx
		54	add ebx,0x0101
		55	xor eax,eax
		56
		57	gk1:
		58	in al,0x60
		59	mov cl,al
		60	gk0:
		61	in al,0x60
		62	cmp al,cl
		63	je gk0
		64	cmp ax,11
		65	jg gk0
		66	gk0_1:
		67	mov cl,al
		68
		69	; add al,47
		70	; mov [ds:keyinbs-0x10000],al
		71	; mov si,keyinbs-0x10000
		72	; call printplain
		73
		74	gk12:
		75	in al,0x60
		76	cmp al,cl
		77	je gk12
		78	cmp ax,240
		79	jne gk13
		80	mov al,cl
		81	jmp gk14
		82	gk13:
		83	add cl,128
		84	cmp al,cl
		85	jne gk1
		86	sub al,128
		87	gk14:
		88
		89	movzx edx,bl
		90	cmp eax,edx
		91	jb gk1
		92	movzx edx,bh
		93	cmp eax,edx
		94	jg gk1
		95	test ebx,0x010000
		96	jnz gk3
		97	mov cx,0x1000
		98	mov dx,cx
		99	add eax,47
		100	mov cx,ax
		101	cmp cx,58
		102	jb gk_nozero
		103	sub cx,10
		104	gk_nozero:
		105	mov [ds:keyin-0x10000],cl
		106	mov si,keyin-0x10000
		107	call printplain
		108	gk3:
		109	sub eax,48
		110	pop edx
		111	pop ecx
		112	ret
		113
		114
		115	;=========================================================================
		116	;
		117	; 16 BIT CODE
		118	;
		119	;=========================================================================
		120
		121
		122	start_of_code:
		123
		124	; RESET 16 BIT SELECTORS/REGISTERS/STACK
		125
		126	mov ax,0x1000
		127	mov es,ax
		128	mov ds,ax
		129
12	halyavin	130	mov ax,0x3000
1	ha	131	mov ss,ax
12	halyavin	132	mov sp,0xec00
1	ha	133
		134	xor ax,ax
		135	xor bx,bx
		136	xor cx,cx
		137	xor dx,dx
		138	xor si,si
		139	xor di,di
		140	xor bp,bp
		141
		142
		143
		144	; DRAW FRAMES
		145
		146	call setbase1000
		147
		148	cmp byte [es:display_atboot-0x10000],2
		149	je no_mode_atboot
		150
		151	mov ax,0x0003
		152	mov bx,0x0000
		153	mov dx,0x0000
		154	int 0x10
		155
		156	no_mode_atboot:
		157
		158	; Load & set russian VGA font (RU.INC)
		159	mov bp,RU_FNT1-10000h ; RU_FNT1 - First part
		160	mov bx,1000h ; 768 bytes
		161	mov cx,30h ; 48 symbols
		162	mov dx,80h ; 128 - position of first symbol
		163	mov ax,1100h
		164	push cs
		165	pop es
		166	int 10h
		167
		168	mov bp,RU_FNT2-10000h ; RU_FNT2 -Second part
		169	mov bx,1000h ; 512 bytes
		170	mov cx,20h ; 32 symbols
		171	mov dx,0E0h ; 224 - position of first symbol
		172	mov ax,1100h
		173	push cs
		174	pop es
		175	int 10h
		176	; End set VGA russian font
		177
		178	call setbase1000
		179	mov ax,0xb800
		180	mov es,ax
		181	mov di,0
		182	mov si,d80x25-0x10000
		183	mov cx,80*25
		184	mov ah,1*16+15
		185	dfl1:
		186	cld
		187	lodsb
		188	stosw
		189	loop dfl1
		190
		191	call setbase1000
		192
		193
		194	; SAY HI TO USER
		195
		196	mov si,linef2-0x10000
		197	call printplain
		198	mov si,version-0x10000
		199	call print
		200
		201
		202	; TEST FOR 386+
		203
		204	pushf
		205	pop ax
		206	mov dx,ax
		207	xor ax,0x4000
		208	push ax
		209	popf
		210	pushf
		211	pop ax
		212	and ax,0x4000
		213	and dx,0x4000
		214	cmp ax,dx
		215	jnz cpugood
		216	mov si,not386-0x10000
		217	call print
		218	jmp $
		219	cpugood:
		220
		221	; RESET 32 BIT SELECTORS/REGISTERS/SELECTORS
		222
		223	mov ax,0x1000
		224	mov es,ax
		225	mov ds,ax
		226
12	halyavin	227	mov ax,0x3000
1	ha	228	mov ss,ax
12	halyavin	229	mov esp,0xec00
1	ha	230
		231	xor eax,eax
		232	xor ebx,ebx
		233	xor ecx,ecx
		234	xor edx,edx
		235	xor esi,esi
		236	xor edi,edi
		237	xor ebp,ebp
		238
		239
		240
		241	; FLUSH 8042 KEYBOARD CONTROLLER
		242
		243	;// mike.dld [
		244	; mov al,0xED
		245	; out 0x60,al
		246	; or cx,-1
		247	; @@:
		248	; in al,0x64
		249	; test al,2
		250	; jz @f
		251	; loop @b
		252	; @@:
		253	; mov al,0
		254	; out 0x60,al
		255	; or cx,-1
		256	; @@:
		257	; in al,0x64
		258	; test al,2
		259	; jz @f
		260	; loop @b
		261	; @@:
		262	;// mike.dld ]
		263
		264	; mov ecx,10000
		265	; fl1:
		266	; in al,0x64
		267	; loop fl1
		268	; test al,1
		269	; jz fl2
		270	; in al,0x60
		271	; jmp fl1
		272	; fl2:
		273
		274	;****************************************************************
		275	; The function is modified Mario79
		276	;*****************************************************************
		277	; wait_kbd: ; variant 1
		278	; mov cx,2500h ;�� 10 ��
		279	; test_kbd:
		280	; in al,64h ;��
		281	; test al,2 ;��
		282	; loopnz test_kbd
		283
		284	mov al,0xf6 ; �� , ��
		285	out 0x60,al
		286	mov cx,0
		287	wait_loop: ; variant 2
		288	; reading state of port of 8042 controller
		289	in al,64h
		290	and al,00000010b ; ready flag
		291	; wait until 8042 controller is ready
		292	loopnz wait_loop
		293
		294	; DISPLAY VESA INFORMATION
		295
		296	mov ax,0x0
		297	mov es,ax
		298	mov ax,0x4f00
		299	mov di,0xa000
		300	int 0x10
		301	cmp ax,0x004f
		302	je vesaok2
		303	mov dx,0x1000
		304	mov es,dx
		305	mov si,novesa-0x10000
		306	call print
		307	mov ax,16
		308	jmp novesafound
		309	vesaok2:
		310	mov ax,[es:di+4]
		311	mov dx,ax
		312	add ax,'0'*256+'0'
		313	push word 0x1000
		314	pop es
		315	mov [es:vervesa+vervesa_off-0x10000], ah
		316	mov [es:vervesa+vervesa_off+2-0x10000], al
		317	; ivan 24/11/2004 begin
		318	;push ax
		319	; ivan 24/11/2004 end
		320	mov si,vervesa-0x10000
		321	call print
		322	novesafound:
		323	call setbase1000
		324	; ivan 24/11/2004 begin
		325	;pop bx
		326	; ivan 24/11/2004 end
		327
		328
		329	; ASK GRAPHICS MODE
		330
		331	movzx eax,byte [es:preboot_graph-0x10000]
		332	cmp eax,0
		333	jne pre_graph
		334	mov si,gr_mode-0x10000
		335	call printplain
		336	gml0:
		337	mov ebx,0x0A01
		338	call getkey
		339	pre_graph:
		340	cmp eax,1
		341	jl sgml1
		342	cmp eax,8
		343	jg sgml1
		344	mov si,ax
		345	sub si,1
		346	shl si,4
		347	add si,gr_table-0x10000
		348	mov bx,[es:si+0]
		349	mov cx,[es:si+4]
		350	mov dx,[es:si+8]
		351	jmp gml10
		352	sgml1:
		353	cmp al,9
		354	jnz gml00
		355	mov bx,0x13
		356	mov cx,640
		357	mov dx,480
		358	push word 0x0
		359	pop es
		360	mov [es:0x9000],byte 32
		361	mov dword [es:0x9018],0x800000
		362	push word 0x1000
		363	pop es
		364	jmp gml10
		365	gml00:
		366	cmp al,0xa
		367	jnz gml02
		368	mov bx,0x12
		369	mov cx,640
		370	mov dx,480
		371	push word 0x0
		372	pop es
		373	mov [es:0x9000],byte 32
		374	mov dword [es:0x9018],0x800000
		375	push word 0x1000
		376	pop es
		377	jmp gml10
		378	gml02:
		379	jmp gml0
		380	gr_table:
		381	dd 0x112+0100000000000000b , 640 , 480 , 0
		382	dd 0x115+0100000000000000b , 800 , 600 , 0
		383	dd 0x118+0100000000000000b , 1024 , 768 , 0
		384	dd 0x11B+0100000000000000b , 1280 , 1024 , 0
		385	dd 0x112 , 640 , 480 , 0
		386	dd 0x115 , 800 , 600 , 0
		387	dd 0x118 , 1024 , 768 , 0
		388	dd 0x11B , 1280 ,1024 , 0
		389	gml10:
		390	push word 0x0000
		391	pop es
		392	mov [es:0x9008],bx
		393	mov [es:0x900A],cx
		394	mov [es:0x900C],dx
		395	push word 0x1000
		396	pop es
		397	mov ax,32
		398	cmp bx,0x13
		399	je nov
		400	cmp bx,0x12
		401	je nov
		402
		403
		404	; USE DEFAULTS OR PROBE
		405
		406	; bx - mode : cx - x size : dx - y size
		407
		408	;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
		409	movzx ax,[es:preboot_gprobe-0x10000]
		410	test ax,ax
		411	jne pre_probe
		412	;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
		413
		414	test bx,0100000000000000b
		415	jz noprobe
		416
		417	mov si,probetext-0x10000
		418	call printplain
		419	push bx
		420	mov ebx,0x0201
		421	call getkey
		422	pop bx
		423
		424	pre_probe:
		425	cmp ax,1
		426	je noprobe
		427
		428	push cx dx
		429
		430	mov bx,0x100
		431
		432	newprobe:
		433
		434	inc bx
		435	cmp bx,0x17f
		436	jne probemore
		437
		438	mov si,prnotfnd-0x10000
		439	call printplain
		440
		441	jmp $
		442
		443	probemore:
		444
		445	mov ax,0x4f01
		446	mov cx,bx
		447	and cx,0xfff
		448	push word 0x0000
		449	pop es
		450	mov di,0xa000
		451	int 0x10
		452
		453	mov eax,[es:di] ; lfb ?
		454	test eax,10000000b
		455	jz newprobe
		456
		457	mov eax,[es:di+0x12] ; x size ?
		458	cmp ax,word [esp+2]
		459	jne newprobe
		460
		461	mov eax,[es:di+0x14] ; y size ?
		462	cmp ax,dx
		463	jne newprobe
		464
		465	movzx eax,byte [es:di+0x19]
		466	cmp eax,32 ;24
		467	jb newprobe
		468
		469	push word 0x0000 ; save probed mode
		470	pop es
		471	add bx,0100000000000000b
		472	mov [es:0x9008],bx
		473	push word 0x1000
		474	pop es
		475
		476	push bx
		477
		478	mov si,prid-0x10000
		479	call printplain
		480
		481	pop bx dx cx
		482
		483	noprobe:
		484
		485
		486	; FIND VESA 2.0 LFB & BPP
		487
		488	mov ax,0x4f01
		489	mov cx,bx
		490	and cx,0xfff
		491	push word 0x0000
		492	pop es
		493	mov di,0xa000
		494	int 0x10
		495	; LFB
		496	mov ecx,[es:di+0x28]
		497	mov [es:0x9018],ecx
		498	; BPP
		499	movzx ax,byte [es:di+0x19]
		500	mov [es:0x9000],ax
		501	; ---- vbe voodoo
		502	BytesPerScanLine equ 0x10
		503	push ax
		504	mov ax, [es:di+BytesPerScanLine]
		505	mov [es:0x9001],ax
		506	pop ax
		507	; -----
		508	nov:
		509	cmp ax,24
		510	jnz nbpp24
		511	mov si,bt24-0x10000
		512	jmp bppl
		513	nbpp24:
		514	cmp ax,32
		515	jnz nbpp32
		516	mov si,bt32-0x10000
		517	jmp bppl
		518	nbpp32:
		519	mov si,btns-0x10000
		520	call print
		521	jmp $
		522	bppl:
		523	call printplain
		524
		525
		526	; FIND VESA 1.2 PM BANK SWITCH ADDRESS
		527
		528	mov ax,0x4f0A
		529	mov bx,0x0
		530	int 0x10
		531	xor eax,eax
		532	xor ebx,ebx
		533	mov ax,es
		534	shl eax,4
		535	mov bx,di
		536	add eax,ebx
		537	xor ebx,ebx
		538	mov bx,[es:di]
		539	add eax,ebx
		540	push word 0x0
		541	pop es
		542	mov [es:0x9014],eax
		543	push word 0x1000
		544	pop es
		545
		546
		547
		548	; GRAPHICS ACCELERATION
		549
		550	mov al, [es:preboot_mtrr-0x10000]
		551	test al,al
		552	jne pre_mtrr
		553	mov si,gr_acc-0x10000
		554	call printplain
		555	mov ebx,0x0201
		556	call getkey
		557	pre_mtrr:
		558	push word 0x0000
		559	pop es
		560	mov [es:0x901C],al
		561	push word 0x1000
		562	pop es
		563	mov si,linef-0x10000
		564	call printplain
		565
		566
		567	; VRR_M USE
		568
		569	mov al,[es:preboot_vrrm-0x10000]
		570	test al,al
		571	jne pre_vrrm
		572	mov si,vrrmprint-0x10000
		573	call print
		574	mov ebx,0x0301
		575	call getkey
		576	pre_vrrm:
		577	push word 0x0000
		578	pop es
		579	mov [es:0x9030],al
		580	push word 0x1000
		581	pop es
		582	mov si,linef2-0x10000
		583	call printplain
		584
		585
		586	; MEMORY MODEL
		587
		588	; movzx eax,byte [es:preboot_memory-0x10000]
		589	; cmp eax,0
		590	; jne pre_mem
		591	;;;;;;;;;;;;;;;;;;;;;;;;;
		592	; mario79 - memory size ;
		593	;;;;;;;;;;;;;;;;;;;;;;;;;
		594	; mov ax,0E801h
		595	;;; xor bx,bx ; thanks to Alexei for bugfix [18.07.2004]
		596	; xor cx, cx
		597	; xor dx, dx
		598	; int 0x15
		599	; movzx ebx, dx ;bx
		600	; movzx eax, cx ;ax
		601	; shl ebx,6 ; �� (x64)
		602	; add eax,ebx
		603	; add eax, 1000h ;440h
		604	; cmp eax,40000h ; 256?
		605	; jge mem_256_z
		606	; cmp eax,20000h ; 128?
		607	; jge mem_128_z
		608	; cmp eax,10000h ; 64?
		609	; jge mem_64_z
		610	; cmp eax,8000h ; 32?
		611	; jge mem_32_z
		612	; jmp mem_16_z
		613	;
		614	;mem_256_z: mov si,memokz256-0x10000
		615	; call printplain
		616	; mov eax,5
		617	; jmp pre_mem
		618	;mem_128_z: mov si,memokz128-0x10000
		619	; call printplain
		620	; mov eax,4
		621	; jmp pre_mem
		622	;mem_64_z: mov si,memokz64-0x10000
		623	; call printplain
		624	; mov eax,3
		625	; jmp pre_mem
		626	;mem_32_z: mov si,memokz32-0x10000
		627	; call printplain
		628	; mov eax,2
		629	; jmp pre_mem
		630	;mem_16_z: mov si,memokz16-0x10000
		631	; call printplain
		632	; mov eax,1
		633	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		634	; pre_mem:
		635	; push word 0x0000
		636	; pop es
		637	; mov [es:0x9030],al
		638	; push word 0x1000
		639	; pop es
		640	; mov si,linef-0x10000
		641	; call printplain
		642
		643
		644
		645
		646	; DIRECT WRITE TO LFB, PAGING DISABLED
		647
		648	; movzx eax,byte [es:preboot_lfb-0x10000]
		649	; mov eax,1 ; paging disabled
		650	; cmp eax,0
		651	; jne pre_lfb
		652	; mov si,gr_direct-0x10000
		653	; call printplain
		654	; mov ebx,0x0201
		655	; call getkey
		656	; pre_lfb:
		657	; push word 0x0000
		658	; pop es
		659	; mov [es:0x901E],al
		660	; mov ax,0x1000
		661	; mov es,ax
		662	; mov si,linef-0x10000
		663	; call printplain
		664	push 0
		665	pop es
		666	mov [es:0x901E],byte 1
		667	push 0x1000
		668	pop es
		669
		670
		671
		672	; BOOT DEVICE
		673
		674	movzx eax,byte [es:preboot_device-0x10000]
		675	cmp eax,0
		676	jne pre_device
		677	mov si,bdev-0x10000
		678	call printplain
		679	mov ebx,0x0301
		680	call getkey
		681	pre_device:
		682	dec al
		683	mov [es:boot_dev-0x10000],al
		684	mov si,linef-0x10000
		685	call printplain
		686
		687
		688
		689	; READ DISKETTE TO MEMORY
		690
		691	cmp [boot_dev-0x10000],0
		692	jne no_sys_on_floppy
		693	mov si,diskload-0x10000
		694	call print
		695	mov ax,0x0000 ; reset drive
		696	mov dx,0x0000
		697	int 0x13
		698	mov cx,0x0001 ; startcyl,startsector
		699	mov dx,0x0000 ; starthead,drive
		700	push word 80*2 ; read no of sect
		701	reads:
		702	pusha
		703	xor si,si
		704	newread:
		705	push word 0x0
		706	pop es
		707	mov bx,0xa000 ; es:bx -> data area
		708	mov ax,0x0200+18 ; read, no of sectors to read
		709	int 0x13
		710	cmp ah,0
		711	jz goodread
		712	add si,1
		713	cmp si,10
		714	jnz newread
		715	mov si,badsect-0x10000
		716	call printplain
		717	jmp $
		718	goodread:
		719	; move -> 1mb
		720	mov si,movedesc-0x10000
		721	push word 0x1000
		722	pop es
		723	mov cx,256*18
		724	mov ah,0x87
		725	int 0x15
		726
		727	cmp ah,0 ; was the move successfull ?
		728	je goodmove
		729	mov dx,0x3f2 ; floppy motor off
		730	mov al,0
		731	out dx,al
		732	mov si,memmovefailed-0x10000
		733	call print
		734	jmp $
		735	goodmove:
		736
		737	mov eax,[es:movedesc-0x10000+0x18+2]
		738	add eax,512*18
		739	mov [es:movedesc-0x10000+0x18+2],eax
		740	popa
		741	inc dh
		742	cmp dh,2
		743	jnz bb2
		744	mov dh,0
		745	inc ch
		746	pusha ; print prosentage
		747	push word 0x1000
		748	pop es
		749	xor eax,eax ; 5
		750	mov al,ch
		751	shr eax,2
		752	and eax,1
		753	mov ebx,5
		754	mul bx
		755	add al,48
		756	mov [es:pros+1-0x10000],al
		757	xor eax,eax ; 10
		758	mov al,ch
		759	shr eax,3
		760	add al,48
		761	mov [es:pros-0x10000],al
		762	mov si,pros-0x10000
		763	call printplain
		764	popa
		765	bb2:
		766	pop ax
		767	dec ax
		768	push ax
		769	cmp ax,0
		770	jnz rs
		771	jmp readdone
		772	rs:
		773	jmp reads
		774	movedesc:
		775	db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
		776	db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
		777
		778	db 0xff,0xff,0x0,0xa0,0x00,0x93,0x0,0x0
		779	db 0xff,0xff,0x0,0x00,0x10,0x93,0x0,0x0
		780
		781	db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
		782	db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
		783	db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
		784	db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
		785	readdone:
		786	pop ax
		787	mov dx,0x3f2 ; floppy motor off
		788	mov al,0
		789	out dx,al
		790	mov si,backspace-0x10000
		791	call printplain
		792	call printplain
		793	mov si,okt-0x10000
		794	call printplain
		795	no_sys_on_floppy:
		796	mov ax,0x0000 ; reset drive
		797	mov dx,0x0000
		798	int 0x13
		799	mov dx,0x3f2 ; floppy motor off
		800	mov al,0
		801	out dx,al
		802
		803
		804	; PAGE TABLE
		805
		806	push word 0x0000
		807	pop es
		808	mov ecx,[es:0x9018]
		809	push ecx
		810
		811	map_mem equ 64 ; amount of memory to map
		812
		813	mov bx,0x6000
		814	mov es,bx ; [es:di] = 6000:0
		815	xor edi,edi
		816	mov ecx,256*map_mem ; Map (mapmem) M
		817	mov eax,7
		818	cld
		819	pt2:
		820	cmp ecx,256*(map_mem-8) ; 8 M map to LFB
		821	jnz pt3
		822	pop eax
		823	add eax,7
		824	pt3:
		825	cmp ecx,256*(map_mem-12) ; 12 M back to linear = physical
		826	jnz pt4
		827	mov eax,12*0x100000 + 7
		828	pt4:
		829	stosd
		830	add eax,4096
		831	loop pt2
		832
		833	mov bx,0x7100
		834	mov es,bx
		835	xor edi,edi
		836	mov eax,8*0x100000+7
		837	mov ecx,256*4
		838	pt5:
		839	stosd
		840	add eax,0x1000
		841	loop pt5
		842
		843	; 4 KB PAGE DIRECTORY
		844
		845	mov bx , 0x7F00
		846	mov es , bx ; [es:di] = 7000:0
		847	xor edi, edi
		848	mov ecx, 64 / 4
		849	mov eax, 0x60007 ; for 0 M
		850	cld
		851	pd4k:
		852	stosd
		853	add eax, 0x1000
		854	loop pd4k
		855	mov dword [es:0x800],0x71007 ;map region 0x80000000-0x803FFFFF to 0x800000-0xCFFFFF
		856	xor esi,esi
		857	mov edi,second_base_address shr 20
		858	mov ecx,64/4
		859	mov bx,0x7F00
		860	mov ds,bx
		861	rep movsd
		862	mov bx,0x1000
		863	mov ds,bx
		864
		865	mov eax, 0x7F000 +8+16 ; Page directory and enable caches
		866	mov cr3, eax
		867
		868	; SET GRAPHICS
		869
		870	mov dx,0x0000
		871	mov es,dx
		872	mov bx,[es:0x9008]
		873	mov ax,bx ; vga & 320x200
		874	cmp ax,0x13
		875	je setgr
		876	cmp ax,0x12
		877	je setgr
		878	mov ax,0x4f02 ; Vesa
		879	setgr:
		880	int 0x10
		881	cmp ah,0
		882	jz gmok
		883	mov si,fatalsel-0x10000
		884	call print
		885	jmp $
		886
		887	gmok:
		888	mov dx,0x1000
		889	mov es,dx
		890
		891	; set mode 0x12 graphics registers:
		892
		893	cmp bx,0x12
		894	jne gmok2
		895
		896	mov al,0x05
		897	mov dx,0x03ce
		898	out dx,al ; select GDC mode register
		899	mov al,0x02
		900	mov dx,0x03cf
		901	out dx,al ; set write mode 2
		902
		903	mov al,0x02
		904	mov dx,0x03c4
		905	out dx,al ; select VGA sequencer map mask register
		906	mov al,0x0f
		907	mov dx,0x03c5
		908	out dx,al ; set mask for all planes 0-3
		909
		910	mov al,0x08
		911	mov dx,0x03ce
		912	out dx,al ; select GDC bit mask register
		913	; for writes to 0x03cf
		914
		915	gmok2:
		916	mov dx,0x1000
		917	mov es,dx

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(root)/kernel/trunk/boot/bootcode.inc @ 29 – Rev 12