vgabios.c@ 1

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1	// ============================================================================================
2	/*
3	* vgabios.c
4	*/
5	// ============================================================================================
6	//
7	// Copyright (C) 2001,2002 the LGPL VGABios developers Team
8	//
9	// This library is free software; you can redistribute it and/or
10	// modify it under the terms of the GNU Lesser General Public
11	// License as published by the Free Software Foundation; either
12	// version 2 of the License, or (at your option) any later version.
13	//
14	// This library is distributed in the hope that it will be useful,
15	// but WITHOUT ANY WARRANTY; without even the implied warranty of
16	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17	// Lesser General Public License for more details.
18	//
19	// You should have received a copy of the GNU Lesser General Public
20	// License along with this library; if not, write to the Free Software
21	// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22	//
23	// ============================================================================================
24	//
25	// This VGA Bios is specific to the plex86/bochs Emulated VGA card.
26	// You can NOT drive any physical vga card with it.
27	//
28	// ============================================================================================
29	//
30	// This file contains code ripped from :
31	// - rombios.c of plex86
32	//
33	// This VGA Bios contains fonts from :
34	// - fntcol16.zip (c) by Joseph Gil avalable at :
35	// ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip
36	// These fonts are public domain
37	//
38	// This VGA Bios is based on information taken from :
39	// - Kevin Lawton's vga card emulation for bochs/plex86
40	// - Ralf Brown's interrupts list available at http://www.cs.cmu.edu/afs/cs/user/ralf/pub/WWW/files.html
41	// - Finn Thogersons' VGADOC4b available at http://home.worldonline.dk/~finth/
42	// - Michael Abrash's Graphics Programming Black Book
43	// - Francois Gervais' book "programmation des cartes graphiques cga-ega-vga" edited by sybex
44	// - DOSEMU 1.0.1 source code for several tables values and formulas
45	//
46	// Thanks for patches, comments and ideas to :
47	// - techt@pikeonline.net
48	//
49	// ============================================================================================
50	#include "vgabios.h"
51
52	#ifdef VBE
53	#include "vbe.h"
54	#endif
55
56	/* Declares */
57	static Bit8u read_byte();
58	static Bit16u read_word();
59	static void write_byte();
60	static void write_word();
61	static Bit8u inb();
62	static Bit16u inw();
63	static void outb();
64	static void outw();
65
66	static Bit16u get_SS();
67
68	// Output
69	static void printf();
70	static void unimplemented();
71	static void unknown();
72
73	static Bit8u find_vga_entry();
74
75	static void memsetb();
76	static void memsetw();
77	static void memcpyb();
78	static void memcpyw();
79
80	static void biosfn_set_video_mode();
81	static void biosfn_set_cursor_shape();
82	static void biosfn_set_cursor_pos();
83	static void biosfn_get_cursor_pos();
84	static void biosfn_set_active_page();
85	static void biosfn_scroll();
86	static void biosfn_read_char_attr();
87	static void biosfn_write_char_attr();
88	static void biosfn_write_char_only();
89	static void biosfn_write_pixel();
90	static void biosfn_read_pixel();
91	static void biosfn_write_teletype();
92	static void biosfn_perform_gray_scale_summing();
93	static void biosfn_load_text_user_pat();
94	static void biosfn_load_text_8_14_pat();
95	static void biosfn_load_text_8_8_pat();
96	static void biosfn_load_text_8_16_pat();
97	static void biosfn_load_gfx_8_8_chars();
98	static void biosfn_load_gfx_user_chars();
99	static void biosfn_load_gfx_8_14_chars();
100	static void biosfn_load_gfx_8_8_dd_chars();
101	static void biosfn_load_gfx_8_16_chars();
102	static void biosfn_get_font_info();
103	static void biosfn_alternate_prtsc();
104	static void biosfn_switch_video_interface();
105	static void biosfn_enable_video_refresh_control();
106	static void biosfn_write_string();
107	static void biosfn_read_state_info();
108	static void biosfn_read_video_state_size();
109	static void biosfn_save_video_state();
110	static void biosfn_restore_video_state();
111
112	// This is for compiling with gcc2 and gcc3
113	#define ASM_START #asm
114	#define ASM_END #endasm
115
116	ASM_START
117
118	MACRO SET_INT_VECTOR
119	push ds
120	xor ax, ax
121	mov ds, ax
122	mov ax, ?3
123	mov ?1*4, ax
124	mov ax, ?2
125	mov ?1*4+2, ax
126	pop ds
127	MEND
128
129	ASM_END
130
131	ASM_START
132	.text
133	.rom
134	.org 0
135
136	use16 386
137
138	vgabios_start:
139	.byte 0x55, 0xaa /* BIOS signature, required for BIOS extensions */
140
141	.byte 0x40 /* BIOS extension length in units of 512 bytes */
142
143
144	vgabios_entry_point:
145
146	jmp vgabios_init_func
147
148	vgabios_name:
149	#ifdef VBOX
150	.ascii "VirtualBox VGA BIOS"
151	#else
152	.ascii "Plex86/Bochs VGABios"
153	#endif
154	.ascii " "
155	.byte 0x00
156
157	// Info from Bart Oldeman
158	.org 0x1e
159	.ascii "IBM"
160	.byte 0x00
161
162	#ifndef VBOX
163	vgabios_version:
164	#ifndef VGABIOS_VERS
165	.ascii "current-cvs"
166	#else
167	.ascii VGABIOS_VERS
168	#endif
169	.ascii " "
170
171	vgabios_date:
172	.ascii VGABIOS_DATE
173	.byte 0x0a,0x0d
174	.byte 0x00
175	#endif
176
177	#ifndef VBOX
178	vgabios_copyright:
179	.ascii "(C) 2003 the LGPL VGABios developers Team"
180	.byte 0x0a,0x0d
181	.byte 0x00
182	#endif
183
184	#ifndef VBOX
185	vgabios_license:
186	.ascii "This VGA/VBE Bios is released under the GNU LGPL"
187	.byte 0x0a,0x0d
188	.byte 0x0a,0x0d
189	.byte 0x00
190
191	vgabios_website:
192	.ascii "Please visit :"
193	.byte 0x0a,0x0d
194	;;.ascii " . http://www.plex86.org"
195	;;.byte 0x0a,0x0d
196	.ascii " . http://bochs.sourceforge.net"
197	.byte 0x0a,0x0d
198	.ascii " . http://www.nongnu.org/vgabios"
199	.byte 0x0a,0x0d
200	.byte 0x0a,0x0d
201	.byte 0x00
202	#endif
203
204
205	;; ============================================================================================
206	;;
207	;; Init Entry point
208	;;
209	;; ============================================================================================
210	vgabios_init_func:
211
212	;; init vga card
213	call init_vga_card
214
215	;; init basic bios vars
216	call init_bios_area
217
218	#ifdef VBE
219	;; init vbe functions
220	call vbe_init
221	#endif
222
223	;; set int10 vect
224	SET_INT_VECTOR(0x10, #0xC000, #vgabios_int10_handler)
225
226	#ifdef CIRRUS
227	call cirrus_init
228	#endif
229
230	;; display splash screen
231	call _display_splash_screen
232
233	;; init video mode and clear the screen
234	;; @@AS: Do not remove this init, because it will break VESA graphics
235	mov ax,#0x0003
236	int #0x10
237
238	#ifndef VBOX
239
240	;; show info
241	call _display_info
242
243	#ifdef VBE
244	;; show vbe info
245	call vbe_display_info
246	#endif
247
248	#ifdef CIRRUS
249	;; show cirrus info
250	call cirrus_display_info
251	#endif
252
253	#else /* VBOX */
254
255	#ifdef DEBUG_bird
256	;; init video mode and clear the screen
257	mov ax,#0x0003
258	int #0x10
259	#endif
260	#endif /* VBOX */
261
262	retf
263	ASM_END
264
265	/*
266	* int10 handled here
267	*/
268	ASM_START
269	vgabios_int10_handler:
270	pushf
271	#ifdef DEBUG
272	push es
273	push ds
274	pusha
275	mov bx, #0xc000
276	mov ds, bx
277	call _int10_debugmsg
278	popa
279	pop ds
280	pop es
281	#endif
282	cmp ah, #0x0f
283	jne int10_test_1A
284	call biosfn_get_video_mode
285	jmp int10_end
286	int10_test_1A:
287	cmp ah, #0x1a
288	jne int10_test_0B
289	call biosfn_group_1A
290	jmp int10_end
291	int10_test_0B:
292	cmp ah, #0x0b
293	jne int10_test_1103
294	call biosfn_group_0B
295	jmp int10_end
296	int10_test_1103:
297	cmp ax, #0x1103
298	jne int10_test_12
299	call biosfn_set_text_block_specifier
300	jmp int10_end
301	int10_test_12:
302	cmp ah, #0x12
303	jne int10_test_101B
304	cmp bl, #0x10
305	jne int10_test_BL30
306	call biosfn_get_ega_info
307	jmp int10_end
308	int10_test_BL30:
309	cmp bl, #0x30
310	jne int10_test_BL31
311	call biosfn_select_vert_res
312	jmp int10_end
313	int10_test_BL31:
314	cmp bl, #0x31
315	jne int10_test_BL32
316	call biosfn_enable_default_palette_loading
317	jmp int10_end
318	int10_test_BL32:
319	cmp bl, #0x32
320	jne int10_test_BL33
321	call biosfn_enable_video_addressing
322	jmp int10_end
323	int10_test_BL33:
324	cmp bl, #0x33
325	jne int10_test_BL34
326	call biosfn_enable_grayscale_summing
327	jmp int10_end
328	int10_test_BL34:
329	cmp bl, #0x34
330	jne int10_normal
331	call biosfn_enable_cursor_emulation
332	jmp int10_end
333	int10_test_101B:
334	cmp ax, #0x101b
335	je int10_normal
336	cmp ah, #0x10
337	#ifndef VBE
338	jne int10_normal
339	#else
340	jne int10_test_4F
341	#endif
342	call biosfn_group_10
343	jmp int10_end
344	#ifdef VBE
345	int10_test_4F:
346	cmp ah, #0x4f
347	jne int10_normal
348	cmp al, #0x03
349	jne int10_test_vbe_05
350	call vbe_biosfn_return_current_mode
351	jmp int10_end
352	int10_test_vbe_05:
353	cmp al, #0x05
354	jne int10_test_vbe_06
355	call vbe_biosfn_display_window_control
356	jmp int10_end
357	int10_test_vbe_06:
358	cmp al, #0x06
359	jne int10_test_vbe_07
360	call vbe_biosfn_set_get_logical_scan_line_length
361	jmp int10_end
362	int10_test_vbe_07:
363	cmp al, #0x07
364	jne int10_test_vbe_08
365	call vbe_biosfn_set_get_display_start
366	jmp int10_end
367	int10_test_vbe_08:
368	cmp al, #0x08
369	jne int10_normal
370	call vbe_biosfn_set_get_dac_palette_format
371	jmp int10_end
372	#endif
373
374	int10_normal:
375	push es
376	push ds
377	pusha
378
379	;; We have to set ds to access the right data segment
380	mov bx, #0xc000
381	mov ds, bx
382	call _int10_func
383
384	popa
385	pop ds
386	pop es
387	int10_end:
388	popf
389	iret
390	ASM_END
391
392	#include "vgatables.h"
393	#include "vgafonts.h"
394
395	/*
396	* Boot time harware inits
397	*/
398	ASM_START
399	init_vga_card:
400	;; switch to color mode and enable CPU access 480 lines
401	mov dx, #0x3C2
402	mov al, #0xC3
403	outb dx,al
404
405	;; more than 64k 3C4/04
406	mov dx, #0x3C4
407	mov al, #0x04
408	outb dx,al
409	mov dx, #0x3C5
410	mov al, #0x02
411	outb dx,al
412
413	mov bx, #msg_vga_init
414	push bx
415	call _printf
416	inc sp
417	inc sp
418	ret
419
420	msg_vga_init:
421	.ascii "InnoTek VirtualBox Version "
422	.ascii VBOX_VERSION
423	.ascii " VGA BIOS"
424	.byte 0x0d,0x0a,0x00
425	ASM_END
426
427	// --------------------------------------------------------------------------------------------
428	/*
429	* Boot time bios area inits
430	*/
431	ASM_START
432	init_bios_area:
433	push ds
434	mov ax, # BIOSMEM_SEG
435	mov ds, ax
436
437	;; init detected hardware BIOS Area
438	mov bx, # BIOSMEM_INITIAL_MODE
439	mov ax, [bx]
440	and ax, #0xffcf
441	;; set 80x25 color (not clear from RBIL but usual)
442	or ax, #0x0020
443	mov [bx], ax
444
445	;; Just for the first int10 find its children
446
447	;; the default char height
448	mov bx, # BIOSMEM_CHAR_HEIGHT
449	mov al, #0x10
450	mov [bx], al
451
452	;; Clear the screen
453	mov bx, # BIOSMEM_VIDEO_CTL
454	mov al, #0x60
455	mov [bx], al
456
457	;; Set the basic screen we have
458	mov bx, # BIOSMEM_SWITCHES
459	mov al, #0xf9
460	mov [bx], al
461
462	;; Set the basic modeset options
463	mov bx, # BIOSMEM_MODESET_CTL
464	mov al, #0x51
465	mov [bx], al
466
467	;; Set the default MSR
468	mov bx, # BIOSMEM_CURRENT_MSR
469	mov al, #0x09
470	mov [bx], al
471
472	pop ds
473	ret
474	ASM_END
475
476	// --------------------------------------------------------------------------------------------
477	/*
478	* Boot time Splash screen
479	*/
480	static void display_splash_screen()
481	{
482	}
483
484	// --------------------------------------------------------------------------------------------
485	/*
486	* Tell who we are
487	*/
488
489	static void display_info()
490	{
491	#ifndef VBOX
492	ASM_START
493	mov ax,#0xc000
494	mov ds,ax
495	mov si,#vgabios_name
496	call _display_string
497
498	mov si,#vgabios_version
499	call _display_string
500
501	;;mov si,#vgabios_copyright
502	;;call _display_string
503	;;mov si,#crlf
504	;;call _display_string
505
506	mov si,#vgabios_license
507	call _display_string
508	mov si,#vgabios_website
509	call _display_string
510	ASM_END
511	#endif
512	}
513
514	static void display_string()
515	{
516	// Get length of string
517	ASM_START
518	mov ax,ds
519	mov es,ax
520	mov di,si
521	xor cx,cx
522	not cx
523	xor al,al
524	cld
525	repne
526	scasb
527	not cx
528	dec cx
529	push cx
530
531	mov ax,#0x0300
532	mov bx,#0x0000
533	int #0x10
534
535	pop cx
536	mov ax,#0x1301
537	mov bx,#0x000b
538	mov bp,si
539	int #0x10
540	ASM_END
541	}
542
543	// --------------------------------------------------------------------------------------------
544	#ifdef DEBUG
545	static void int10_debugmsg(DI, SI, BP, SP, BX, DX, CX, AX, DS, ES, FLAGS)
546	Bit16u DI, SI, BP, SP, BX, DX, CX, AX, ES, DS, FLAGS;
547	{
548	// 0E is write char...
549	if(GET_AH()!=0x0E)
550	printf("vgabios call ah%02x al%02x bx%04x cx%04x dx%04x\n",GET_AH(),GET_AL(),BX,CX,DX);
551	}
552	#endif
553
554	// --------------------------------------------------------------------------------------------
555	/*
556	* int10 main dispatcher
557	*/
558	static void int10_func(DI, SI, BP, SP, BX, DX, CX, AX, DS, ES, FLAGS)
559	Bit16u DI, SI, BP, SP, BX, DX, CX, AX, ES, DS, FLAGS;
560	{
561
562	// BIOS functions
563	switch(GET_AH())
564	{
565	case 0x00:
566	biosfn_set_video_mode(GET_AL());
567	switch(GET_AL()&0x7F)
568	{case 6:
569	SET_AL(0x3F);
570	break;
571	case 0:
572	case 1:
573	case 2:
574	case 3:
575	case 4:
576	case 5:
577	case 7:
578	SET_AL(0x30);
579	break;
580	default:
581	SET_AL(0x20);
582	}
583	break;
584	case 0x01:
585	biosfn_set_cursor_shape(GET_CH(),GET_CL());
586	break;
587	case 0x02:
588	biosfn_set_cursor_pos(GET_BH(),DX);
589	break;
590	case 0x03:
591	biosfn_get_cursor_pos(GET_BH(),&CX,&DX);
592	break;
593	case 0x04:
594	// Read light pen pos (unimplemented)
595	#ifdef DEBUG
596	unimplemented();
597	#endif
598	AX=0x00;
599	BX=0x00;
600	CX=0x00;
601	DX=0x00;
602	break;
603	case 0x05:
604	biosfn_set_active_page(GET_AL());
605	break;
606	case 0x06:
607	biosfn_scroll(GET_AL(),GET_BH(),GET_CH(),GET_CL(),GET_DH(),GET_DL(),0xFF,SCROLL_UP);
608	break;
609	case 0x07:
610	biosfn_scroll(GET_AL(),GET_BH(),GET_CH(),GET_CL(),GET_DH(),GET_DL(),0xFF,SCROLL_DOWN);
611	break;
612	case 0x08:
613	biosfn_read_char_attr(GET_BH(),&AX);
614	break;
615	case 0x09:
616	biosfn_write_char_attr(GET_AL(),GET_BH(),GET_BL(),CX);
617	break;
618	case 0x0A:
619	biosfn_write_char_only(GET_AL(),GET_BH(),GET_BL(),CX);
620	break;
621	case 0x0C:
622	biosfn_write_pixel(GET_BH(),GET_AL(),CX,DX);
623	break;
624	case 0x0D:
625	biosfn_read_pixel(GET_BH(),CX,DX,&AX);
626	break;
627	case 0x0E:
628	// Ralf Brown Interrupt list is WRONG on bh(page)
629	// We do output only on the current page !
630	biosfn_write_teletype(GET_AL(),0xff,GET_BL(),NO_ATTR);
631	break;
632	case 0x10:
633	// All other functions of group AH=0x10 rewritten in assembler
634	biosfn_perform_gray_scale_summing(BX,CX);
635	break;
636	case 0x11:
637	switch(GET_AL())
638	{
639	case 0x00:
640	case 0x10:
641	biosfn_load_text_user_pat(GET_AL(),ES,BP,CX,DX,GET_BL(),GET_BH());
642	break;
643	case 0x01:
644	case 0x11:
645	biosfn_load_text_8_14_pat(GET_AL(),GET_BL());
646	break;
647	case 0x02:
648	case 0x12:
649	biosfn_load_text_8_8_pat(GET_AL(),GET_BL());
650	break;
651	case 0x04:
652	case 0x14:
653	biosfn_load_text_8_16_pat(GET_AL(),GET_BL());
654	break;
655	case 0x20:
656	biosfn_load_gfx_8_8_chars(ES,BP);
657	break;
658	case 0x21:
659	biosfn_load_gfx_user_chars(ES,BP,CX,GET_BL(),GET_DL());
660	break;
661	case 0x22:
662	biosfn_load_gfx_8_14_chars(GET_BL());
663	break;
664	case 0x23:
665	biosfn_load_gfx_8_8_dd_chars(GET_BL());
666	break;
667	case 0x24:
668	biosfn_load_gfx_8_16_chars(GET_BL());
669	break;
670	case 0x30:
671	biosfn_get_font_info(GET_BH(),&ES,&BP,&CX,&DX);
672	break;
673	#ifdef DEBUG
674	default:
675	unknown();
676	#endif
677	}
678
679	break;
680	case 0x12:
681	switch(GET_BL())
682	{
683	case 0x20:
684	biosfn_alternate_prtsc();
685	break;
686	case 0x35:
687	biosfn_switch_video_interface(GET_AL(),ES,DX);
688	SET_AL(0x12);
689	break;
690	case 0x36:
691	biosfn_enable_video_refresh_control(GET_AL());
692	SET_AL(0x12);
693	break;
694	#ifdef DEBUG
695	default:
696	unknown();
697	#endif
698	}
699	break;
700	case 0x13:
701	biosfn_write_string(GET_AL(),GET_BH(),GET_BL(),CX,GET_DH(),GET_DL(),ES,BP);
702	break;
703	case 0x1B:
704	biosfn_read_state_info(BX,ES,DI);
705	SET_AL(0x1B);
706	break;
707	case 0x1C:
708	switch(GET_AL())
709	{
710	case 0x00:
711	biosfn_read_video_state_size(CX,&BX);
712	break;
713	case 0x01:
714	biosfn_save_video_state(CX,ES,BX);
715	break;
716	case 0x02:
717	biosfn_restore_video_state(CX,ES,BX);
718	break;
719	#ifdef DEBUG
720	default:
721	unknown();
722	#endif
723	}
724	SET_AL(0x1C);
725	break;
726
727	#ifdef VBE
728	case 0x4f:
729	if (vbe_has_vbe_display()) {
730	switch(GET_AL())
731	{
732	case 0x00:
733	vbe_biosfn_return_controller_information(&AX,ES,DI);
734	break;
735	case 0x01:
736	vbe_biosfn_return_mode_information(&AX,CX,ES,DI);
737	break;
738	case 0x02:
739	vbe_biosfn_set_mode(&AX,BX,ES,DI);
740	break;
741	case 0x04:
742	//FIXME
743	#ifdef DEBUG
744	unimplemented();
745	#endif
746	// function failed
747	AX=0x100;
748	break;
749	case 0x09:
750	//FIXME
751	#ifdef DEBUG
752	unimplemented();
753	#endif
754	// function failed
755	AX=0x100;
756	break;
757	case 0x0A:
758	//FIXME
759	#ifdef DEBUG
760	unimplemented();
761	#endif
762	// function failed
763	AX=0x100;
764	break;
765	default:
766	#ifdef DEBUG
767	unknown();
768	#endif
769	// function failed
770	AX=0x100;
771	}
772	}
773	else {
774	// No VBE display
775	AX=0x0100;
776	}
777	break;
778	#endif
779
780	#ifdef DEBUG
781	default:
782	unknown();
783	#endif
784	}
785	}
786
787	// ============================================================================================
788	//
789	// BIOS functions
790	//
791	// ============================================================================================
792
793	static void biosfn_set_video_mode(mode) Bit8u mode;
794	{// mode: Bit 7 is 1 if no clear screen
795
796	// Should we clear the screen ?
797	Bit8u noclearmem=mode&0x80;
798	Bit8u line,mmask,*palette;
799	Bit16u i,twidth,theight,cheight;
800	Bit8u modeset_ctl,video_ctl,vga_switches;
801	Bit16u crtc_addr;
802
803	#ifdef VBE
804	if (vbe_has_vbe_display()) {
805	dispi_set_enable(VBE_DISPI_DISABLED);
806	}
807	#endif // def VBE
808
809	// The real mode
810	mode=mode&0x7f;
811
812	// find the entry in the video modes
813	line=find_vga_entry(mode);
814
815	#ifdef DEBUG
816	printf("mode search %02x found line %02x\n",mode,line);
817	#endif
818
819	if(line==0xFF)
820	return;
821
822	twidth=vga_modes[line].twidth;
823	theight=vga_modes[line].theight;
824	cheight=vga_modes[line].cheight;
825
826	// Read the bios vga control
827	video_ctl=read_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL);
828
829	// Read the bios vga switches
830	vga_switches=read_byte(BIOSMEM_SEG,BIOSMEM_SWITCHES);
831
832	// Read the bios mode set control
833	modeset_ctl=read_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL);
834
835	// Then we know the number of lines
836	// FIXME
837
838	// if palette loading (bit 3 of modeset ctl = 0)
839	if((modeset_ctl&0x08)==0)
840	{// Set the PEL mask
841	outb(VGAREG_PEL_MASK,vga_modes[line].pelmask);
842
843	// Set the whole dac always, from 0
844	outb(VGAREG_DAC_WRITE_ADDRESS,0x00);
845
846	// From which palette
847	switch(vga_modes[line].dacmodel)
848	{case 0:
849	palette=&palette0;
850	break;
851	case 1:
852	palette=&palette1;
853	break;
854	case 2:
855	palette=&palette2;
856	break;
857	case 3:
858	palette=&palette3;
859	break;
860	}
861	// Always 256*3 values
862	for(i=0;i<0x0100;i++)
863	{if(i<=dac_regs[vga_modes[line].dacmodel])
864	{outb(VGAREG_DAC_DATA,palette[(i*3)+0]);
865	outb(VGAREG_DAC_DATA,palette[(i*3)+1]);
866	outb(VGAREG_DAC_DATA,palette[(i*3)+2]);
867	}
868	else
869	{outb(VGAREG_DAC_DATA,0);
870	outb(VGAREG_DAC_DATA,0);
871	outb(VGAREG_DAC_DATA,0);
872	}
873	}
874	if((modeset_ctl&0x02)==0x02)
875	{
876	biosfn_perform_gray_scale_summing(0x00, 0x100);
877	}
878	}
879
880	// Reset Attribute Ctl flip-flop
881	inb(VGAREG_ACTL_RESET);
882
883	// Set Attribute Ctl
884	for(i=0;i<=ACTL_MAX_REG;i++)
885	{outb(VGAREG_ACTL_ADDRESS,i);
886	outb(VGAREG_ACTL_WRITE_DATA,actl_regs[vga_modes[line].actlmodel][i]);
887	}
888
889	// Set Sequencer Ctl
890	for(i=0;i<=SEQU_MAX_REG;i++)
891	{outb(VGAREG_SEQU_ADDRESS,i);
892	outb(VGAREG_SEQU_DATA,sequ_regs[vga_modes[line].sequmodel][i]);
893	}
894
895	// Set Grafx Ctl
896	for(i=0;i<=GRDC_MAX_REG;i++)
897	{outb(VGAREG_GRDC_ADDRESS,i);
898	outb(VGAREG_GRDC_DATA,grdc_regs[vga_modes[line].grdcmodel][i]);
899	}
900
901	// Set CRTC address VGA or MDA
902	crtc_addr=vga_modes[line].memmodel==MTEXT?VGAREG_MDA_CRTC_ADDRESS:VGAREG_VGA_CRTC_ADDRESS;
903
904	// Disable CRTC write protection
905	outw(crtc_addr,0x0011);
906	// Set CRTC regs
907	for(i=0;i<=CRTC_MAX_REG;i++)
908	{outb(crtc_addr,i);
909	outb(crtc_addr+1,crtc_regs[vga_modes[line].crtcmodel][i]);
910	}
911
912	// Set the misc register
913	outb(VGAREG_WRITE_MISC_OUTPUT,vga_modes[line].miscreg);
914
915	// Enable video
916	outb(VGAREG_ACTL_ADDRESS,0x20);
917	inb(VGAREG_ACTL_RESET);
918
919	if(noclearmem==0x00)
920	{
921	if(vga_modes[line].class==TEXT)
922	{
923	memsetw(vga_modes[line].sstart,0,0x0720,0x4000); // 32k
924	}
925	else
926	{
927	if(mode<0x0d)
928	{
929	memsetw(vga_modes[line].sstart,0,0x0000,0x4000); // 32k
930	}
931	else
932	{
933	outb( VGAREG_SEQU_ADDRESS, 0x02 );
934	mmask = inb( VGAREG_SEQU_DATA );
935	outb( VGAREG_SEQU_DATA, 0x0f ); // all planes
936	memsetw(vga_modes[line].sstart,0,0x0000,0x8000); // 64k
937	outb( VGAREG_SEQU_DATA, mmask );
938	}
939	}
940	}
941
942	// Set the BIOS mem
943	write_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE,mode);
944	write_word(BIOSMEM_SEG,BIOSMEM_NB_COLS,twidth);
945	write_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE,vga_modes[line].slength);
946	write_word(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS,crtc_addr);
947	write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS,theight-1);
948	write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT,cheight);
949	write_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL,(0x60\|noclearmem));
950	write_byte(BIOSMEM_SEG,BIOSMEM_SWITCHES,0xF9);
951	write_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL,read_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL)&0x7f);
952
953	// FIXME We nearly have the good tables. to be reworked
954	write_byte(BIOSMEM_SEG,BIOSMEM_DCC_INDEX,0x08); // 8 is VGA should be ok for now
955	write_word(BIOSMEM_SEG,BIOSMEM_VS_POINTER,0x00);
956	write_word(BIOSMEM_SEG,BIOSMEM_VS_POINTER+2,0x00);
957
958	// FIXME
959	write_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MSR,0x00); // Unavailable on vanilla vga, but...
960	write_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_PAL,0x00); // Unavailable on vanilla vga, but...
961
962	// Set cursor shape
963	if(vga_modes[line].class==TEXT)
964	{
965	biosfn_set_cursor_shape(0x06,0x07);
966	}
967
968	// Set cursor pos for page 0..7
969	for(i=0;i<8;i++)
970	biosfn_set_cursor_pos(i,0x0000);
971
972	// Set active page 0
973	biosfn_set_active_page(0x00);
974
975	// Write the fonts in memory
976	if(vga_modes[line].class==TEXT)
977	{
978	ASM_START
979	;; copy and activate 8x16 font
980	mov ax, #0x1104
981	mov bl, #0x00
982	int #0x10
983	mov ax, #0x1103
984	mov bl, #0x00
985	int #0x10
986	ASM_END
987	}
988
989	// Set the ints 0x1F and 0x43
990	ASM_START
991	SET_INT_VECTOR(0x1f, #0xC000, #_vgafont8+128*8)
992	ASM_END
993
994	switch(cheight)
995	{case 8:
996	ASM_START
997	SET_INT_VECTOR(0x43, #0xC000, #_vgafont8)
998	ASM_END
999	break;
1000	case 14:
1001	ASM_START
1002	SET_INT_VECTOR(0x43, #0xC000, #_vgafont14)
1003	ASM_END
1004	break;
1005	case 16:
1006	ASM_START
1007	SET_INT_VECTOR(0x43, #0xC000, #_vgafont16)
1008	ASM_END
1009	break;
1010	}
1011	}
1012
1013	// --------------------------------------------------------------------------------------------
1014	static void biosfn_set_cursor_shape (CH,CL)
1015	Bit8u CH;Bit8u CL;
1016	{Bit16u cheight,curs,crtc_addr;
1017	Bit8u modeset_ctl;
1018
1019	CH&=0x3f;
1020	CL&=0x1f;
1021
1022	curs=(CH<<8)+CL;
1023	write_word(BIOSMEM_SEG,BIOSMEM_CURSOR_TYPE,curs);
1024
1025	modeset_ctl=read_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL);
1026	cheight = read_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT);
1027	if((modeset_ctl&0x01) && (cheight>8) && (CL<8) && (CH<0x20))
1028	{
1029	if(CL!=(CH+1))
1030	{
1031	CH = ((CH+1) * cheight / 8) -1;
1032	}
1033	else
1034	{
1035	CH = ((CL+1) * cheight / 8) - 2;
1036	}
1037	CL = ((CL+1) * cheight / 8) - 1;
1038	}
1039
1040	// CTRC regs 0x0a and 0x0b
1041	crtc_addr=read_word(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS);
1042	outb(crtc_addr,0x0a);
1043	outb(crtc_addr+1,CH);
1044	outb(crtc_addr,0x0b);
1045	outb(crtc_addr+1,CL);
1046	}
1047
1048	// --------------------------------------------------------------------------------------------
1049	static void biosfn_set_cursor_pos (page, cursor)
1050	Bit8u page;Bit16u cursor;
1051	{
1052	Bit8u xcurs,ycurs,current;
1053	Bit16u nbcols,nbrows,address,crtc_addr;
1054
1055	// Should not happen...
1056	if(page>7)return;
1057
1058	// Bios cursor pos
1059	write_word(BIOSMEM_SEG, BIOSMEM_CURSOR_POS+2*page, cursor);
1060
1061	// Set the hardware cursor
1062	current=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_PAGE);
1063	if(page==current)
1064	{
1065	// Get the dimensions
1066	nbcols=read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1067	nbrows=read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)+1;
1068
1069	xcurs=cursor&0x00ff;ycurs=(cursor&0xff00)>>8;
1070
1071	// Calculate the address knowing nbcols nbrows and page num
1072	address=SCREEN_IO_START(nbcols,nbrows,page)+xcurs+ycurs*nbcols;
1073
1074	// CRTC regs 0x0e and 0x0f
1075	crtc_addr=read_word(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS);
1076	outb(crtc_addr,0x0e);
1077	outb(crtc_addr+1,(address&0xff00)>>8);
1078	outb(crtc_addr,0x0f);
1079	outb(crtc_addr+1,address&0x00ff);
1080	}
1081	}
1082
1083	// --------------------------------------------------------------------------------------------
1084	static void biosfn_get_cursor_pos (page,shape, pos)
1085	Bit8u page;Bit16u shape;Bit16u pos;
1086	{
1087	Bit16u ss=get_SS();
1088
1089	// Default
1090	write_word(ss, shape, 0);
1091	write_word(ss, pos, 0);
1092
1093	if(page>7)return;
1094	// FIXME should handle VGA 14/16 lines
1095	write_word(ss,shape,read_word(BIOSMEM_SEG,BIOSMEM_CURSOR_TYPE));
1096	write_word(ss,pos,read_word(BIOSMEM_SEG,BIOSMEM_CURSOR_POS+page*2));
1097	}
1098
1099	// --------------------------------------------------------------------------------------------
1100	static void biosfn_set_active_page (page)
1101	Bit8u page;
1102	{
1103	Bit16u cursor,dummy,crtc_addr;
1104	Bit16u nbcols,nbrows,address;
1105	Bit8u mode,line;
1106
1107	if(page>7)return;
1108
1109	// Get the mode
1110	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1111	line=find_vga_entry(mode);
1112	if(line==0xFF)return;
1113
1114	// Get pos curs pos for the right page
1115	biosfn_get_cursor_pos(page,&dummy,&cursor);
1116
1117	if(vga_modes[line].class==TEXT)
1118	{
1119	// Get the dimensions
1120	nbcols=read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1121	nbrows=read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)+1;
1122
1123	// Calculate the address knowing nbcols nbrows and page num
1124	address=SCREEN_MEM_START(nbcols,nbrows,page);
1125	write_word(BIOSMEM_SEG,BIOSMEM_CURRENT_START,address);
1126
1127	// Start address
1128	address=SCREEN_IO_START(nbcols,nbrows,page);
1129	}
1130	else
1131	{
1132	address = page*vga_modes[line].slength;
1133	}
1134
1135	// CRTC regs 0x0c and 0x0d
1136	crtc_addr=read_word(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS);
1137	outb(crtc_addr,0x0c);
1138	outb(crtc_addr+1,(address&0xff00)>>8);
1139	outb(crtc_addr,0x0d);
1140	outb(crtc_addr+1,address&0x00ff);
1141
1142	// And change the BIOS page
1143	write_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_PAGE,page);
1144
1145	#ifdef DEBUG
1146	printf("Set active page %02x address %04x\n",page,address);
1147	#endif
1148
1149	// Display the cursor, now the page is active
1150	biosfn_set_cursor_pos(page,cursor);
1151	}
1152
1153	// --------------------------------------------------------------------------------------------
1154	static void vgamem_copy_pl4(xstart,ysrc,ydest,cols,nbcols,cheight)
1155	Bit8u xstart;Bit8u ysrc;Bit8u ydest;Bit8u cols;Bit8u nbcols;Bit8u cheight;
1156	{
1157	Bit16u src,dest;
1158	Bit8u i;
1159
1160	src=ysrccheightnbcols+xstart;
1161	dest=ydestcheightnbcols+xstart;
1162	outw(VGAREG_GRDC_ADDRESS, 0x0105);
1163	for(i=0;i<cheight;i++)
1164	{
1165	memcpyb(0xa000,dest+inbcols,0xa000,src+inbcols,cols);
1166	}
1167	outw(VGAREG_GRDC_ADDRESS, 0x0005);
1168	}
1169
1170	// --------------------------------------------------------------------------------------------
1171	static void vgamem_fill_pl4(xstart,ystart,cols,nbcols,cheight,attr)
1172	Bit8u xstart;Bit8u ystart;Bit8u cols;Bit8u nbcols;Bit8u cheight;Bit8u attr;
1173	{
1174	Bit16u dest;
1175	Bit8u i;
1176
1177	dest=ystartcheightnbcols+xstart;
1178	outw(VGAREG_GRDC_ADDRESS, 0x0205);
1179	for(i=0;i<cheight;i++)
1180	{
1181	memsetb(0xa000,dest+i*nbcols,attr,cols);
1182	}
1183	outw(VGAREG_GRDC_ADDRESS, 0x0005);
1184	}
1185
1186	// --------------------------------------------------------------------------------------------
1187	static void vgamem_copy_cga(xstart,ysrc,ydest,cols,nbcols,cheight)
1188	Bit8u xstart;Bit8u ysrc;Bit8u ydest;Bit8u cols;Bit8u nbcols;Bit8u cheight;
1189	{
1190	Bit16u src,dest;
1191	Bit8u i;
1192
1193	src=((ysrccheightnbcols)>>1)+xstart;
1194	dest=((ydestcheightnbcols)>>1)+xstart;
1195	for(i=0;i<cheight;i++)
1196	{
1197	if (i & 1)
1198	memcpyb(0xb800,0x2000+dest+(i>>1)nbcols,0xb800,0x2000+src+(i>>1)nbcols,cols);
1199	else
1200	memcpyb(0xb800,dest+(i>>1)nbcols,0xb800,src+(i>>1)nbcols,cols);
1201	}
1202	}
1203
1204	// --------------------------------------------------------------------------------------------
1205	static void vgamem_fill_cga(xstart,ystart,cols,nbcols,cheight,attr)
1206	Bit8u xstart;Bit8u ystart;Bit8u cols;Bit8u nbcols;Bit8u cheight;Bit8u attr;
1207	{
1208	Bit16u dest;
1209	Bit8u i;
1210
1211	dest=((ystartcheightnbcols)>>1)+xstart;
1212	for(i=0;i<cheight;i++)
1213	{
1214	if (i & 1)
1215	memsetb(0xb800,0x2000+dest+(i>>1)*nbcols,attr,cols);
1216	else
1217	memsetb(0xb800,dest+(i>>1)*nbcols,attr,cols);
1218	}
1219	}
1220
1221	// --------------------------------------------------------------------------------------------
1222	static void biosfn_scroll (nblines,attr,rul,cul,rlr,clr,page,dir)
1223	Bit8u nblines;Bit8u attr;Bit8u rul;Bit8u cul;Bit8u rlr;Bit8u clr;Bit8u page;Bit8u dir;
1224	{
1225	// page == 0xFF if current
1226
1227	Bit8u mode,line,cheight,bpp,cols;
1228	Bit16u nbcols,nbrows,i;
1229	Bit16u address;
1230
1231	if(rul>rlr)return;
1232	if(cul>clr)return;
1233
1234	// Get the mode
1235	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1236	line=find_vga_entry(mode);
1237	if(line==0xFF)return;
1238
1239	// Get the dimensions
1240	nbrows=read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)+1;
1241	nbcols=read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1242
1243	// Get the current page
1244	if(page==0xFF)
1245	page=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_PAGE);
1246
1247	if(rlr>=nbrows)rlr=nbrows-1;
1248	if(clr>=nbcols)clr=nbcols-1;
1249	if(nblines>nbrows)nblines=0;
1250	cols=clr-cul+1;
1251
1252	if(vga_modes[line].class==TEXT)
1253	{
1254	// Compute the address
1255	address=SCREEN_MEM_START(nbcols,nbrows,page);
1256	#ifdef DEBUG
1257	printf("Scroll, address %04x (%04x %04x %02x)\n",address,nbrows,nbcols,page);
1258	#endif
1259
1260	if(nblines==0&&rul==0&&cul==0&&rlr==nbrows-1&&clr==nbcols-1)
1261	{
1262	memsetw(vga_modes[line].sstart,address,(Bit16u)attr0x100+' ',nbrowsnbcols);
1263	}
1264	else
1265	{// if Scroll up
1266	if(dir==SCROLL_UP)
1267	{for(i=rul;i<=rlr;i++)
1268	{
1269	if((i+nblines>rlr)\|\|(nblines==0))
1270	memsetw(vga_modes[line].sstart,address+(inbcols+cul)2,(Bit16u)attr*0x100+' ',cols);
1271	else
1272	memcpyw(vga_modes[line].sstart,address+(inbcols+cul)2,vga_modes[line].sstart,((i+nblines)nbcols+cul)2,cols);
1273	}
1274	}
1275	else
1276	{for(i=rlr;i>=rul;i--)
1277	{
1278	if((i<rul+nblines)\|\|(nblines==0))
1279	memsetw(vga_modes[line].sstart,address+(inbcols+cul)2,(Bit16u)attr*0x100+' ',cols);
1280	else
1281	memcpyw(vga_modes[line].sstart,address+(inbcols+cul)2,vga_modes[line].sstart,((i-nblines)nbcols+cul)2,cols);
1282	}
1283	}
1284	}
1285	}
1286	else
1287	{
1288	// FIXME gfx mode not complete
1289	cheight=vga_modes[line].cheight;
1290	switch(vga_modes[line].memmodel)
1291	{
1292	case PLANAR4:
1293	case PLANAR1:
1294	if(nblines==0&&rul==0&&cul==0&&rlr==nbrows-1&&clr==nbcols-1)
1295	{
1296	outw(VGAREG_GRDC_ADDRESS, 0x0205);
1297	memsetb(vga_modes[line].sstart,0,attr,nbrowsnbcolscheight);
1298	outw(VGAREG_GRDC_ADDRESS, 0x0005);
1299	}
1300	else
1301	{// if Scroll up
1302	if(dir==SCROLL_UP)
1303	{for(i=rul;i<=rlr;i++)
1304	{
1305	if((i+nblines>rlr)\|\|(nblines==0))
1306	vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
1307	else
1308	vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
1309	}
1310	}
1311	else
1312	{for(i=rlr;i>=rul;i--)
1313	{
1314	if((i<rul+nblines)\|\|(nblines==0))
1315	vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
1316	else
1317	vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
1318	}
1319	}
1320	}
1321	break;
1322	case CGA:
1323	bpp=vga_modes[line].pixbits;
1324	if(nblines==0&&rul==0&&cul==0&&rlr==nbrows-1&&clr==nbcols-1)
1325	{
1326	memsetb(vga_modes[line].sstart,0,attr,nbrowsnbcolscheight*bpp);
1327	}
1328	else
1329	{
1330	if(bpp==2)
1331	{
1332	cul<<=1;
1333	cols<<=1;
1334	nbcols<<=1;
1335	}
1336	// if Scroll up
1337	if(dir==SCROLL_UP)
1338	{for(i=rul;i<=rlr;i++)
1339	{
1340	if((i+nblines>rlr)\|\|(nblines==0))
1341	vgamem_fill_cga(cul,i,cols,nbcols,cheight,attr);
1342	else
1343	vgamem_copy_cga(cul,i+nblines,i,cols,nbcols,cheight);
1344	}
1345	}
1346	else
1347	{for(i=rlr;i>=rul;i--)
1348	{
1349	if((i<rul+nblines)\|\|(nblines==0))
1350	vgamem_fill_cga(cul,i,cols,nbcols,cheight,attr);
1351	else
1352	vgamem_copy_cga(cul,i,i-nblines,cols,nbcols,cheight);
1353	}
1354	}
1355	}
1356	break;
1357	#ifdef DEBUG
1358	default:
1359	printf("Scroll in graphics mode ");
1360	unimplemented();
1361	#endif
1362	}
1363	}
1364	}
1365
1366	// --------------------------------------------------------------------------------------------
1367	static void biosfn_read_char_attr (page,car)
1368	Bit8u page;Bit16u *car;
1369	{Bit16u ss=get_SS();
1370	Bit8u xcurs,ycurs,mode,line;
1371	Bit16u nbcols,nbrows,address;
1372	Bit16u cursor,dummy;
1373
1374	// Get the mode
1375	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1376	line=find_vga_entry(mode);
1377	if(line==0xFF)return;
1378
1379	// Get the cursor pos for the page
1380	biosfn_get_cursor_pos(page,&dummy,&cursor);
1381	xcurs=cursor&0x00ff;ycurs=(cursor&0xff00)>>8;
1382
1383	// Get the dimensions
1384	nbrows=read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)+1;
1385	nbcols=read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1386
1387	if(vga_modes[line].class==TEXT)
1388	{
1389	// Compute the address
1390	address=SCREEN_MEM_START(nbcols,nbrows,page)+(xcurs+ycursnbcols)2;
1391
1392	write_word(ss,car,read_word(vga_modes[line].sstart,address));
1393	}
1394	else
1395	{
1396	// FIXME gfx mode
1397	#ifdef DEBUG
1398	unimplemented();
1399	#endif
1400	}
1401	}
1402
1403	// --------------------------------------------------------------------------------------------
1404	static void write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight)
1405	Bit8u car;Bit8u attr;Bit8u xcurs;Bit8u ycurs;Bit8u nbcols;Bit8u cheight;
1406	{
1407	Bit8u i,j,mask;
1408	Bit8u *fdata;
1409	Bit16u addr,dest,src;
1410
1411	switch(cheight)
1412	{case 14:
1413	fdata = &vgafont14;
1414	break;
1415	case 16:
1416	fdata = &vgafont16;
1417	break;
1418	default:
1419	fdata = &vgafont8;
1420	}
1421	addr=xcurs+ycurscheightnbcols;
1422	src = car * cheight;
1423	outw(VGAREG_SEQU_ADDRESS, 0x0f02);
1424	outw(VGAREG_GRDC_ADDRESS, 0x0205);
1425	if(attr&0x80)
1426	{
1427	outw(VGAREG_GRDC_ADDRESS, 0x1803);
1428	}
1429	else
1430	{
1431	outw(VGAREG_GRDC_ADDRESS, 0x0003);
1432	}
1433	for(i=0;i<cheight;i++)
1434	{
1435	dest=addr+i*nbcols;
1436	for(j=0;j<8;j++)
1437	{
1438	mask=0x80>>j;
1439	outw(VGAREG_GRDC_ADDRESS, (mask << 8) \| 0x08);
1440	read_byte(0xa000,dest);
1441	if(fdata[src+i]&mask)
1442	{
1443	write_byte(0xa000,dest,attr&0x0f);
1444	}
1445	else
1446	{
1447	write_byte(0xa000,dest,0x00);
1448	}
1449	}
1450	}
1451	ASM_START
1452	mov dx, # VGAREG_GRDC_ADDRESS
1453	mov ax, #0xff08
1454	out dx, ax
1455	mov ax, #0x0005
1456	out dx, ax
1457	mov ax, #0x0003
1458	out dx, ax
1459	ASM_END
1460	}
1461
1462	// --------------------------------------------------------------------------------------------
1463	static void write_gfx_char_cga(car,attr,xcurs,ycurs,nbcols,bpp)
1464	Bit8u car;Bit8u attr;Bit8u xcurs;Bit8u ycurs;Bit8u nbcols;Bit8u bpp;
1465	{
1466	Bit8u i,j,mask,data;
1467	Bit8u *fdata;
1468	Bit16u addr,dest,src;
1469
1470	fdata = &vgafont8;
1471	addr=(xcursbpp)+ycurs320;
1472	src = car * 8;
1473	for(i=0;i<8;i++)
1474	{
1475	dest=addr+(i>>1)*80;
1476	if (i & 1) dest += 0x2000;
1477	mask = 0x80;
1478	if (bpp == 1)
1479	{
1480	if (attr & 0x80)
1481	{
1482	data = read_byte(0xb800,dest);
1483	}
1484	else
1485	{
1486	data = 0x00;
1487	}
1488	for(j=0;j<8;j++)
1489	{
1490	if (fdata[src+i] & mask)
1491	{
1492	if (attr & 0x80)
1493	{
1494	data ^= (attr & 0x01) << (7-j);
1495	}
1496	else
1497	{
1498	data \|= (attr & 0x01) << (7-j);
1499	}
1500	}
1501	mask >>= 1;
1502	}
1503	write_byte(0xb800,dest,data);
1504	}
1505	else
1506	{
1507	while (mask > 0)
1508	{
1509	if (attr & 0x80)
1510	{
1511	data = read_byte(0xb800,dest);
1512	}
1513	else
1514	{
1515	data = 0x00;
1516	}
1517	for(j=0;j<4;j++)
1518	{
1519	if (fdata[src+i] & mask)
1520	{
1521	if (attr & 0x80)
1522	{
1523	data ^= (attr & 0x03) << ((3-j)*2);
1524	}
1525	else
1526	{
1527	data \|= (attr & 0x03) << ((3-j)*2);
1528	}
1529	}
1530	mask >>= 1;
1531	}
1532	write_byte(0xb800,dest,data);
1533	dest += 1;
1534	}
1535	}
1536	}
1537	}
1538
1539	// --------------------------------------------------------------------------------------------
1540	static void write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols)
1541	Bit8u car;Bit8u attr;Bit8u xcurs;Bit8u ycurs;Bit8u nbcols;
1542	{
1543	Bit8u i,j,mask,data;
1544	Bit8u *fdata;
1545	Bit16u addr,dest,src;
1546
1547	fdata = &vgafont8;
1548	addr=xcurs8+ycursnbcols*64;
1549	src = car * 8;
1550	for(i=0;i<8;i++)
1551	{
1552	dest=addr+inbcols8;
1553	mask = 0x80;
1554	for(j=0;j<8;j++)
1555	{
1556	data = 0x00;
1557	if (fdata[src+i] & mask)
1558	{
1559	data = attr;
1560	}
1561	write_byte(0xa000,dest+j,data);
1562	mask >>= 1;
1563	}
1564	}
1565	}
1566
1567	// --------------------------------------------------------------------------------------------
1568	static void biosfn_write_char_attr (car,page,attr,count)
1569	Bit8u car;Bit8u page;Bit8u attr;Bit16u count;
1570	{
1571	Bit8u cheight,xcurs,ycurs,mode,line,bpp;
1572	Bit16u nbcols,nbrows,address;
1573	Bit16u cursor,dummy;
1574
1575	// Get the mode
1576	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1577	line=find_vga_entry(mode);
1578	if(line==0xFF)return;
1579
1580	// Get the cursor pos for the page
1581	biosfn_get_cursor_pos(page,&dummy,&cursor);
1582	xcurs=cursor&0x00ff;ycurs=(cursor&0xff00)>>8;
1583
1584	// Get the dimensions
1585	nbrows=read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)+1;
1586	nbcols=read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1587
1588	if(vga_modes[line].class==TEXT)
1589	{
1590	// Compute the address
1591	address=SCREEN_MEM_START(nbcols,nbrows,page)+(xcurs+ycursnbcols)2;
1592
1593	dummy=((Bit16u)attr<<8)+car;
1594	memsetw(vga_modes[line].sstart,address,dummy,count);
1595	}
1596	else
1597	{
1598	// FIXME gfx mode not complete
1599	cheight=vga_modes[line].cheight;
1600	bpp=vga_modes[line].pixbits;
1601	while((count-->0) && (xcurs<nbcols))
1602	{
1603	switch(vga_modes[line].memmodel)
1604	{
1605	case PLANAR4:
1606	case PLANAR1:
1607	write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
1608	break;
1609	case CGA:
1610	write_gfx_char_cga(car,attr,xcurs,ycurs,nbcols,bpp);
1611	break;
1612	case LINEAR8:
1613	write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
1614	break;
1615	#ifdef DEBUG
1616	default:
1617	unimplemented();
1618	#endif
1619	}
1620	xcurs++;
1621	}
1622	}
1623	}
1624
1625	// --------------------------------------------------------------------------------------------
1626	static void biosfn_write_char_only (car,page,attr,count)
1627	Bit8u car;Bit8u page;Bit8u attr;Bit16u count;
1628	{
1629	Bit8u cheight,xcurs,ycurs,mode,line,bpp;
1630	Bit16u nbcols,nbrows,address;
1631	Bit16u cursor,dummy;
1632
1633	// Get the mode
1634	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1635	line=find_vga_entry(mode);
1636	if(line==0xFF)return;
1637
1638	// Get the cursor pos for the page
1639	biosfn_get_cursor_pos(page,&dummy,&cursor);
1640	xcurs=cursor&0x00ff;ycurs=(cursor&0xff00)>>8;
1641
1642	// Get the dimensions
1643	nbrows=read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)+1;
1644	nbcols=read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1645
1646	if(vga_modes[line].class==TEXT)
1647	{
1648	// Compute the address
1649	address=SCREEN_MEM_START(nbcols,nbrows,page)+(xcurs+ycursnbcols)2;
1650
1651	while(count-->0)
1652	{write_byte(vga_modes[line].sstart,address,car);
1653	address+=2;
1654	}
1655	}
1656	else
1657	{
1658	// FIXME gfx mode not complete
1659	cheight=vga_modes[line].cheight;
1660	bpp=vga_modes[line].pixbits;
1661	while((count-->0) && (xcurs<nbcols))
1662	{
1663	switch(vga_modes[line].memmodel)
1664	{
1665	case PLANAR4:
1666	case PLANAR1:
1667	write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
1668	break;
1669	case CGA:
1670	write_gfx_char_cga(car,attr,xcurs,ycurs,nbcols,bpp);
1671	break;
1672	case LINEAR8:
1673	write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
1674	break;
1675	#ifdef DEBUG
1676	default:
1677	unimplemented();
1678	#endif
1679	}
1680	xcurs++;
1681	}
1682	}
1683	}
1684
1685	// --------------------------------------------------------------------------------------------
1686	ASM_START
1687	biosfn_group_0B:
1688	cmp bh, #0x00
1689	je biosfn_set_border_color
1690	cmp bh, #0x01
1691	je biosfn_set_palette
1692	#ifdef DEBUG
1693	call _unknown
1694	#endif
1695	ret
1696	biosfn_set_border_color:
1697	push ax
1698	push bx
1699	push cx
1700	push dx
1701	mov dx, # VGAREG_ACTL_RESET
1702	in al, dx
1703	mov dx, # VGAREG_ACTL_ADDRESS
1704	mov al, #0x00
1705	out dx, al
1706	mov al, bl
1707	and al, #0x0f
1708	test al, #0x08
1709	jz set_low_border
1710	add al, #0x08
1711	set_low_border:
1712	out dx, al
1713	mov cl, #0x01
1714	and bl, #0x10
1715	set_intensity_loop:
1716	mov dx, # VGAREG_ACTL_ADDRESS
1717	mov al, cl
1718	out dx, al
1719	mov dx, # VGAREG_ACTL_READ_DATA
1720	in al, dx
1721	and al, #0xef
1722	or al, bl
1723	mov dx, # VGAREG_ACTL_ADDRESS
1724	out dx, al
1725	inc cl
1726	cmp cl, #0x04
1727	jne set_intensity_loop
1728	mov al, #0x20
1729	out dx, al
1730	pop dx
1731	pop cx
1732	pop bx
1733	pop ax
1734	ret
1735	biosfn_set_palette:
1736	push ax
1737	push bx
1738	push cx
1739	push dx
1740	mov dx, # VGAREG_ACTL_RESET
1741	in al, dx
1742	mov cl, #0x01
1743	and bl, #0x01
1744	set_cga_palette_loop:
1745	mov dx, # VGAREG_ACTL_ADDRESS
1746	mov al, cl
1747	out dx, al
1748	mov dx, # VGAREG_ACTL_READ_DATA
1749	in al, dx
1750	and al, #0xfe
1751	or al, bl
1752	mov dx, # VGAREG_ACTL_ADDRESS
1753	out dx, al
1754	inc cl
1755	cmp cl, #0x04
1756	jne set_cga_palette_loop
1757	mov al, #0x20
1758	out dx, al
1759	pop dx
1760	pop cx
1761	pop bx
1762	pop ax
1763	ret
1764	ASM_END
1765
1766	// --------------------------------------------------------------------------------------------
1767	static void biosfn_write_pixel (BH,AL,CX,DX) Bit8u BH;Bit8u AL;Bit16u CX;Bit16u DX;
1768	{
1769	Bit8u mode,line,mask,attr,data;
1770	Bit16u addr;
1771
1772	// Get the mode
1773	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1774	line=find_vga_entry(mode);
1775	if(line==0xFF)return;
1776	if(vga_modes[line].class==TEXT)return;
1777
1778	switch(vga_modes[line].memmodel)
1779	{
1780	case PLANAR4:
1781	case PLANAR1:
1782	addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1783	mask = 0x80 >> (CX & 0x07);
1784	outw(VGAREG_GRDC_ADDRESS, (mask << 8) \| 0x08);
1785	outw(VGAREG_GRDC_ADDRESS, 0x0205);
1786	data = read_byte(0xa000,addr);
1787	if (AL & 0x80)
1788	{
1789	outw(VGAREG_GRDC_ADDRESS, 0x1803);
1790	}
1791	write_byte(0xa000,addr,AL);
1792	ASM_START
1793	mov dx, # VGAREG_GRDC_ADDRESS
1794	mov ax, #0xff08
1795	out dx, ax
1796	mov ax, #0x0005
1797	out dx, ax
1798	mov ax, #0x0003
1799	out dx, ax
1800	ASM_END
1801	break;
1802	case CGA:
1803	if(vga_modes[line].pixbits==2)
1804	{
1805	addr=(CX>>2)+(DX>>1)*80;
1806	}
1807	else
1808	{
1809	addr=(CX>>3)+(DX>>1)*80;
1810	}
1811	if (DX & 1) addr += 0x2000;
1812	data = read_byte(0xb800,addr);
1813	if(vga_modes[line].pixbits==2)
1814	{
1815	attr = (AL & 0x03) << ((3 - (CX & 0x03)) * 2);
1816	mask = 0x03 << ((3 - (CX & 0x03)) * 2);
1817	}
1818	else
1819	{
1820	attr = (AL & 0x01) << (7 - (CX & 0x07));
1821	mask = 0x01 << (7 - (CX & 0x07));
1822	}
1823	if (AL & 0x80)
1824	{
1825	data ^= attr;
1826	}
1827	else
1828	{
1829	data &= ~mask;
1830	data \|= attr;
1831	}
1832	write_byte(0xb800,addr,data);
1833	break;
1834	case LINEAR8:
1835	addr=CX+DX(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)8);
1836	write_byte(0xa000,addr,AL);
1837	break;
1838	#ifdef DEBUG
1839	default:
1840	unimplemented();
1841	#endif
1842	}
1843	}
1844
1845	// --------------------------------------------------------------------------------------------
1846	static void biosfn_read_pixel (BH,CX,DX,AX) Bit8u BH;Bit16u CX;Bit16u DX;Bit16u *AX;
1847	{
1848	Bit8u mode,line,mask,attr,data,i;
1849	Bit16u addr;
1850	Bit16u ss=get_SS();
1851
1852	// Get the mode
1853	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1854	line=find_vga_entry(mode);
1855	if(line==0xFF)return;
1856	if(vga_modes[line].class==TEXT)return;
1857
1858	switch(vga_modes[line].memmodel)
1859	{
1860	case PLANAR4:
1861	case PLANAR1:
1862	addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1863	mask = 0x80 >> (CX & 0x07);
1864	attr = 0x00;
1865	for(i=0;i<4;i++)
1866	{
1867	outw(VGAREG_GRDC_ADDRESS, (i << 8) \| 0x04);
1868	data = read_byte(0xa000,addr) & mask;
1869	if (data > 0) attr \|= (0x01 << i);
1870	}
1871	break;
1872	case CGA:
1873	addr=(CX>>2)+(DX>>1)*80;
1874	if (DX & 1) addr += 0x2000;
1875	data = read_byte(0xb800,addr);
1876	if(vga_modes[line].pixbits==2)
1877	{
1878	attr = (data >> ((3 - (CX & 0x03)) * 2)) & 0x03;
1879	}
1880	else
1881	{
1882	attr = (data >> (7 - (CX & 0x07))) & 0x01;
1883	}
1884	break;
1885	case LINEAR8:
1886	addr=CX+DX(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)8);
1887	attr=read_byte(0xa000,addr);
1888	break;
1889	default:
1890	#ifdef DEBUG
1891	unimplemented();
1892	#endif
1893	attr = 0;
1894	}
1895	write_word(ss,AX,(read_word(ss,AX) & 0xff00) \| attr);
1896	}
1897
1898	// --------------------------------------------------------------------------------------------
1899	static void biosfn_write_teletype (car, page, attr, flag)
1900	Bit8u car;Bit8u page;Bit8u attr;Bit8u flag;
1901	{// flag = WITH_ATTR / NO_ATTR
1902
1903	Bit8u cheight,xcurs,ycurs,mode,line,bpp;
1904	Bit16u nbcols,nbrows,address;
1905	Bit16u cursor,dummy;
1906
1907	// special case if page is 0xff, use current page
1908	if(page==0xff)
1909	page=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_PAGE);
1910
1911	// Get the mode
1912	mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE);
1913	line=find_vga_entry(mode);
1914	if(line==0xFF)return;
1915
1916	// Get the cursor pos for the page
1917	biosfn_get_cursor_pos(page,&dummy,&cursor);
1918	xcurs=cursor&0x00ff;ycurs=(cursor&0xff00)>>8;
1919
1920	// Get the dimensions
1921	nbrows=read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)+1;
1922	nbcols=read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
1923
1924	switch(car)
1925	{
1926	case 7:
1927	//FIXME should beep
1928	break;
1929
1930	case 8:
1931	if(xcurs>0)xcurs--;
1932	break;
1933
1934	case '\r':
1935	xcurs=0;
1936	break;
1937
1938	case '\n':
1939	ycurs++;
1940	break;
1941
1942	case '\t':
1943	do
1944	{
1945	biosfn_write_teletype(' ',page,attr,flag);
1946	biosfn_get_cursor_pos(page,&dummy,&cursor);
1947	xcurs=cursor&0x00ff;ycurs=(cursor&0xff00)>>8;
1948	}while(xcurs%8==0);
1949	break;
1950
1951	default:
1952
1953	if(vga_modes[line].class==TEXT)
1954	{
1955	// Compute the address
1956	address=SCREEN_MEM_START(nbcols,nbrows,page)+(xcurs+ycursnbcols)2;
1957
1958	// Write the char
1959	write_byte(vga_modes[line].sstart,address,car);
1960
1961	if(flag==WITH_ATTR)
1962	write_byte(vga_modes[line].sstart,address+1,attr);
1963	}
1964	else
1965	{
1966	// FIXME gfx mode not complete
1967	cheight=vga_modes[line].cheight;
1968	bpp=vga_modes[line].pixbits;
1969	switch(vga_modes[line].memmodel)
1970	{
1971	case PLANAR4:
1972	case PLANAR1:
1973	write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
1974	break;
1975	case CGA:
1976	write_gfx_char_cga(car,attr,xcurs,ycurs,nbcols,bpp);
1977	break;
1978	case LINEAR8:
1979	write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
1980	break;
1981	#ifdef DEBUG
1982	default:
1983	unimplemented();
1984	#endif
1985	}
1986	}
1987	xcurs++;
1988	}
1989
1990	// Do we need to wrap ?
1991	if(xcurs==nbcols)
1992	{xcurs=0;
1993	ycurs++;
1994	}
1995
1996	// Do we need to scroll ?
1997	if(ycurs==nbrows)
1998	{
1999	if(vga_modes[line].class==TEXT)
2000	{
2001	biosfn_scroll(0x01,0x07,0,0,nbrows-1,nbcols-1,page,SCROLL_UP);
2002	}
2003	else
2004	{
2005	biosfn_scroll(0x01,0x00,0,0,nbrows-1,nbcols-1,page,SCROLL_UP);
2006	}
2007	ycurs-=1;
2008	}
2009
2010	// Set the cursor for the page
2011	cursor=ycurs; cursor<<=8; cursor+=xcurs;
2012	biosfn_set_cursor_pos(page,cursor);
2013	}
2014
2015	// --------------------------------------------------------------------------------------------
2016	ASM_START
2017	biosfn_get_video_mode:
2018	push ds
2019	mov ax, # BIOSMEM_SEG
2020	mov ds, ax
2021	push bx
2022	mov bx, # BIOSMEM_CURRENT_PAGE
2023	mov al, [bx]
2024	pop bx
2025	mov bh, al
2026	push bx
2027	mov bx, # BIOSMEM_VIDEO_CTL
2028	mov ah, [bx]
2029	and ah, #0x80
2030	mov bx, # BIOSMEM_CURRENT_MODE
2031	mov al, [bx]
2032	or al, ah
2033	mov bx, # BIOSMEM_NB_COLS
2034	mov ah, [bx]
2035	pop bx
2036	pop ds
2037	ret
2038	ASM_END
2039
2040	// --------------------------------------------------------------------------------------------
2041	ASM_START
2042	biosfn_group_10:
2043	cmp al, #0x00
2044	jne int10_test_1001
2045	jmp biosfn_set_single_palette_reg
2046	int10_test_1001:
2047	cmp al, #0x01
2048	jne int10_test_1002
2049	jmp biosfn_set_overscan_border_color
2050	int10_test_1002:
2051	cmp al, #0x02
2052	jne int10_test_1003
2053	jmp biosfn_set_all_palette_reg
2054	int10_test_1003:
2055	cmp al, #0x03
2056	jne int10_test_1007
2057	jmp biosfn_toggle_intensity
2058	int10_test_1007:
2059	cmp al, #0x07
2060	jne int10_test_1008
2061	jmp biosfn_get_single_palette_reg
2062	int10_test_1008:
2063	cmp al, #0x08
2064	jne int10_test_1009
2065	jmp biosfn_read_overscan_border_color
2066	int10_test_1009:
2067	cmp al, #0x09
2068	jne int10_test_1010
2069	jmp biosfn_get_all_palette_reg
2070	int10_test_1010:
2071	cmp al, #0x10
2072	jne int10_test_1012
2073	jmp biosfn_set_single_dac_reg
2074	int10_test_1012:
2075	cmp al, #0x12
2076	jne int10_test_1013
2077	jmp biosfn_set_all_dac_reg
2078	int10_test_1013:
2079	cmp al, #0x13
2080	jne int10_test_1015
2081	jmp biosfn_select_video_dac_color_page
2082	int10_test_1015:
2083	cmp al, #0x15
2084	jne int10_test_1017
2085	jmp biosfn_read_single_dac_reg
2086	int10_test_1017:
2087	cmp al, #0x17
2088	jne int10_test_1018
2089	jmp biosfn_read_all_dac_reg
2090	int10_test_1018:
2091	cmp al, #0x18
2092	jne int10_test_1019
2093	jmp biosfn_set_pel_mask
2094	int10_test_1019:
2095	cmp al, #0x19
2096	jne int10_test_101A
2097	jmp biosfn_read_pel_mask
2098	int10_test_101A:
2099	cmp al, #0x1a
2100	jne int10_group_10_unknown
2101	jmp biosfn_read_video_dac_state
2102	int10_group_10_unknown:
2103	#ifdef DEBUG
2104	call _unknown
2105	#endif
2106	ret
2107
2108	biosfn_set_single_palette_reg:
2109	cmp bl, #0x14
2110	ja no_actl_reg1
2111	push ax
2112	push dx
2113	mov dx, # VGAREG_ACTL_RESET
2114	in al, dx
2115	mov dx, # VGAREG_ACTL_ADDRESS
2116	mov al, bl
2117	out dx, al
2118	mov al, bh
2119	out dx, al
2120	mov al, #0x20
2121	out dx, al
2122	pop dx
2123	pop ax
2124	no_actl_reg1:
2125	ret
2126	ASM_END
2127
2128	// --------------------------------------------------------------------------------------------
2129	ASM_START
2130	biosfn_set_overscan_border_color:
2131	push bx
2132	mov bl, #0x11
2133	call biosfn_set_single_palette_reg
2134	pop bx
2135	ret
2136	ASM_END
2137
2138	// --------------------------------------------------------------------------------------------
2139	ASM_START
2140	biosfn_set_all_palette_reg:
2141	push ax
2142	push bx
2143	push cx
2144	push dx
2145	mov bx, dx
2146	mov dx, # VGAREG_ACTL_RESET
2147	in al, dx
2148	mov cl, #0x00
2149	mov dx, # VGAREG_ACTL_ADDRESS
2150	set_palette_loop:
2151	mov al, cl
2152	out dx, al
2153	seg es
2154	mov al, [bx]
2155	out dx, al
2156	inc bx
2157	inc cl
2158	cmp cl, #0x10
2159	jne set_palette_loop
2160	mov al, #0x11
2161	out dx, al
2162	seg es
2163	mov al, [bx]
2164	out dx, al
2165	mov al, #0x20
2166	out dx, al
2167	pop dx
2168	pop cx
2169	pop bx
2170	pop ax
2171	ret
2172	ASM_END
2173
2174	// --------------------------------------------------------------------------------------------
2175	ASM_START
2176	biosfn_toggle_intensity:
2177	push ax
2178	push bx
2179	push dx
2180	mov dx, # VGAREG_ACTL_RESET
2181	in al, dx
2182	mov dx, # VGAREG_ACTL_ADDRESS
2183	mov al, #0x10
2184	out dx, al
2185	mov dx, # VGAREG_ACTL_READ_DATA
2186	in al, dx
2187	and al, #0xf7
2188	and bl, #0x01
2189	shl bl, 3
2190	or al, bl
2191	mov dx, # VGAREG_ACTL_ADDRESS
2192	out dx, al
2193	mov al, #0x20
2194	out dx, al
2195	pop dx
2196	pop bx
2197	pop ax
2198	ret
2199	ASM_END
2200
2201	// --------------------------------------------------------------------------------------------
2202	ASM_START
2203	biosfn_get_single_palette_reg:
2204	cmp bl, #0x14
2205	ja no_actl_reg2
2206	push ax
2207	push dx
2208	mov dx, # VGAREG_ACTL_RESET
2209	in al, dx
2210	mov dx, # VGAREG_ACTL_ADDRESS
2211	mov al, bl
2212	out dx, al
2213	mov dx, # VGAREG_ACTL_READ_DATA
2214	in al, dx
2215	mov bh, al
2216	mov dx, # VGAREG_ACTL_RESET
2217	in al, dx
2218	mov dx, # VGAREG_ACTL_ADDRESS
2219	mov al, #0x20
2220	out dx, al
2221	pop dx
2222	pop ax
2223	no_actl_reg2:
2224	ret
2225	ASM_END
2226
2227	// --------------------------------------------------------------------------------------------
2228	ASM_START
2229	biosfn_read_overscan_border_color:
2230	push ax
2231	push bx
2232	mov bl, #0x11
2233	call biosfn_get_single_palette_reg
2234	mov al, bh
2235	pop bx
2236	mov bh, al
2237	pop ax
2238	ret
2239	ASM_END
2240
2241	// --------------------------------------------------------------------------------------------
2242	ASM_START
2243	biosfn_get_all_palette_reg:
2244	push ax
2245	push bx
2246	push cx
2247	push dx
2248	mov bx, dx
2249	mov cl, #0x00
2250	get_palette_loop:
2251	mov dx, # VGAREG_ACTL_RESET
2252	in al, dx
2253	mov dx, # VGAREG_ACTL_ADDRESS
2254	mov al, cl
2255	out dx, al
2256	mov dx, # VGAREG_ACTL_READ_DATA
2257	in al, dx
2258	seg es
2259	mov [bx], al
2260	inc bx
2261	inc cl
2262	cmp cl, #0x10
2263	jne get_palette_loop
2264	mov dx, # VGAREG_ACTL_RESET
2265	in al, dx
2266	mov dx, # VGAREG_ACTL_ADDRESS
2267	mov al, #0x11
2268	out dx, al
2269	mov dx, # VGAREG_ACTL_READ_DATA
2270	in al, dx
2271	seg es
2272	mov [bx], al
2273	mov dx, # VGAREG_ACTL_RESET
2274	in al, dx
2275	mov dx, # VGAREG_ACTL_ADDRESS
2276	mov al, #0x20
2277	out dx, al
2278	pop dx
2279	pop cx
2280	pop bx
2281	pop ax
2282	ret
2283	ASM_END
2284
2285	// --------------------------------------------------------------------------------------------
2286	ASM_START
2287	biosfn_set_single_dac_reg:
2288	push ax
2289	push dx
2290	mov dx, # VGAREG_DAC_WRITE_ADDRESS
2291	mov al, bl
2292	out dx, al
2293	mov dx, # VGAREG_DAC_DATA
2294	pop ax
2295	push ax
2296	mov al, ah
2297	out dx, al
2298	mov al, ch
2299	out dx, al
2300	mov al, cl
2301	out dx, al
2302	pop dx
2303	pop ax
2304	ret
2305	ASM_END
2306
2307	// --------------------------------------------------------------------------------------------
2308	ASM_START
2309	biosfn_set_all_dac_reg:
2310	push ax
2311	push bx
2312	push cx
2313	push dx
2314	mov dx, # VGAREG_DAC_WRITE_ADDRESS
2315	mov al, bl
2316	out dx, al
2317	pop dx
2318	push dx
2319	mov bx, dx
2320	mov dx, # VGAREG_DAC_DATA
2321	set_dac_loop:
2322	seg es
2323	mov al, [bx]
2324	out dx, al
2325	inc bx
2326	seg es
2327	mov al, [bx]
2328	out dx, al
2329	inc bx
2330	seg es
2331	mov al, [bx]
2332	out dx, al
2333	inc bx
2334	dec cx
2335	jnz set_dac_loop
2336	pop dx
2337	pop cx
2338	pop bx
2339	pop ax
2340	ret
2341	ASM_END
2342
2343	// --------------------------------------------------------------------------------------------
2344	ASM_START
2345	biosfn_select_video_dac_color_page:
2346	push ax
2347	push bx
2348	push dx
2349	mov dx, # VGAREG_ACTL_RESET
2350	in al, dx
2351	mov dx, # VGAREG_ACTL_ADDRESS
2352	mov al, #0x10
2353	out dx, al
2354	mov dx, # VGAREG_ACTL_READ_DATA
2355	in al, dx
2356	and bl, #0x01
2357	jnz set_dac_page
2358	and al, #0x7f
2359	shl bh, 7
2360	or al, bh
2361	mov dx, # VGAREG_ACTL_ADDRESS
2362	out dx, al
2363	jmp set_actl_normal
2364	set_dac_page:
2365	push ax
2366	mov dx, # VGAREG_ACTL_RESET
2367	in al, dx
2368	mov dx, # VGAREG_ACTL_ADDRESS
2369	mov al, #0x14
2370	out dx, al
2371	pop ax
2372	and al, #0x80
2373	jnz set_dac_16_page
2374	shl bh, 2
2375	set_dac_16_page:
2376	and bh, #0x0f
2377	mov al, bh
2378	out dx, al
2379	set_actl_normal:
2380	mov al, #0x20
2381	out dx, al
2382	pop dx
2383	pop bx
2384	pop ax
2385	ret
2386	ASM_END
2387
2388	// --------------------------------------------------------------------------------------------
2389	ASM_START
2390	biosfn_read_single_dac_reg:
2391	push ax
2392	push dx
2393	mov dx, # VGAREG_DAC_READ_ADDRESS
2394	mov al, bl
2395	out dx, al
2396	pop ax
2397	mov ah, al
2398	mov dx, # VGAREG_DAC_DATA
2399	in al, dx
2400	xchg al, ah
2401	push ax
2402	in al, dx
2403	mov ch, al
2404	in al, dx
2405	mov cl, al
2406	pop dx
2407	pop ax
2408	ret
2409	ASM_END
2410
2411	// --------------------------------------------------------------------------------------------
2412	ASM_START
2413	biosfn_read_all_dac_reg:
2414	push ax
2415	push bx
2416	push cx
2417	push dx
2418	mov dx, # VGAREG_DAC_READ_ADDRESS
2419	mov al, bl
2420	out dx, al
2421	pop dx
2422	push dx
2423	mov bx, dx
2424	mov dx, # VGAREG_DAC_DATA
2425	read_dac_loop:
2426	in al, dx
2427	seg es
2428	mov [bx], al
2429	inc bx
2430	in al, dx
2431	seg es
2432	mov [bx], al
2433	inc bx
2434	in al, dx
2435	seg es
2436	mov [bx], al
2437	inc bx
2438	dec cx
2439	jnz read_dac_loop
2440	pop dx
2441	pop cx
2442	pop bx
2443	pop ax
2444	ret
2445	ASM_END
2446
2447	// --------------------------------------------------------------------------------------------
2448	ASM_START
2449	biosfn_set_pel_mask:
2450	push ax
2451	push dx
2452	mov dx, # VGAREG_PEL_MASK
2453	mov al, bl
2454	out dx, al
2455	pop dx
2456	pop ax
2457	ret
2458	ASM_END
2459
2460	// --------------------------------------------------------------------------------------------
2461	ASM_START
2462	biosfn_read_pel_mask:
2463	push ax
2464	push dx
2465	mov dx, # VGAREG_PEL_MASK
2466	in al, dx
2467	mov bl, al
2468	pop dx
2469	pop ax
2470	ret
2471	ASM_END
2472
2473	// --------------------------------------------------------------------------------------------
2474	ASM_START
2475	biosfn_read_video_dac_state:
2476	push ax
2477	push dx
2478	mov dx, # VGAREG_ACTL_RESET
2479	in al, dx
2480	mov dx, # VGAREG_ACTL_ADDRESS
2481	mov al, #0x10
2482	out dx, al
2483	mov dx, # VGAREG_ACTL_READ_DATA
2484	in al, dx
2485	mov bl, al
2486	shr bl, 7
2487	mov dx, # VGAREG_ACTL_RESET
2488	in al, dx
2489	mov dx, # VGAREG_ACTL_ADDRESS
2490	mov al, #0x14
2491	out dx, al
2492	mov dx, # VGAREG_ACTL_READ_DATA
2493	in al, dx
2494	mov bh, al
2495	and bh, #0x0f
2496	test bl, #0x01
2497	jnz get_dac_16_page
2498	shr bh, 2
2499	get_dac_16_page:
2500	mov dx, # VGAREG_ACTL_RESET
2501	in al, dx
2502	mov dx, # VGAREG_ACTL_ADDRESS
2503	mov al, #0x20
2504	out dx, al
2505	pop dx
2506	pop ax
2507	ret
2508	ASM_END
2509
2510	// --------------------------------------------------------------------------------------------
2511	static void biosfn_perform_gray_scale_summing (start,count)
2512	Bit16u start;Bit16u count;
2513	{Bit8u r,g,b;
2514	Bit16u i;
2515	Bit16u index;
2516
2517	inb(VGAREG_ACTL_RESET);
2518	outb(VGAREG_ACTL_ADDRESS,0x00);
2519
2520	for( index = 0; index < count; index++ )
2521	{
2522	// set read address and switch to read mode
2523	outb(VGAREG_DAC_READ_ADDRESS,start);
2524	// get 6-bit wide RGB data values
2525	r=inb( VGAREG_DAC_DATA );
2526	g=inb( VGAREG_DAC_DATA );
2527	b=inb( VGAREG_DAC_DATA );
2528
2529	// intensity = ( 0.3 * Red ) + ( 0.59 * Green ) + ( 0.11 * Blue )
2530	i = ( ( 77r + 151g + 28*b ) + 0x80 ) >> 8;
2531
2532	if(i>0x3f)i=0x3f;
2533
2534	// set write address and switch to write mode
2535	outb(VGAREG_DAC_WRITE_ADDRESS,start);
2536	// write new intensity value
2537	outb( VGAREG_DAC_DATA, i&0xff );
2538	outb( VGAREG_DAC_DATA, i&0xff );
2539	outb( VGAREG_DAC_DATA, i&0xff );
2540	start++;
2541	}
2542	inb(VGAREG_ACTL_RESET);
2543	outb(VGAREG_ACTL_ADDRESS,0x20);
2544	}
2545
2546	// --------------------------------------------------------------------------------------------
2547	static void get_font_access()
2548	{
2549	ASM_START
2550	mov dx, # VGAREG_SEQU_ADDRESS
2551	mov ax, #0x0100
2552	out dx, ax
2553	mov ax, #0x0402
2554	out dx, ax
2555	mov ax, #0x0704
2556	out dx, ax
2557	mov ax, #0x0300
2558	out dx, ax
2559	mov dx, # VGAREG_GRDC_ADDRESS
2560	mov ax, #0x0204
2561	out dx, ax
2562	mov ax, #0x0005
2563	out dx, ax
2564	mov ax, #0x0406
2565	out dx, ax
2566	ASM_END
2567	}
2568
2569	static void release_font_access()
2570	{
2571	ASM_START
2572	mov dx, # VGAREG_SEQU_ADDRESS
2573	mov ax, #0x0100
2574	out dx, ax
2575	mov ax, #0x0302
2576	out dx, ax
2577	mov ax, #0x0304
2578	out dx, ax
2579	mov ax, #0x0300
2580	out dx, ax
2581	mov dx, # VGAREG_READ_MISC_OUTPUT
2582	in al, dx
2583	and al, #0x01
2584	shl al, 2
2585	or al, #0x0a
2586	mov ah, al
2587	mov al, #0x06
2588	mov dx, # VGAREG_GRDC_ADDRESS
2589	out dx, ax
2590	mov ax, #0x0004
2591	out dx, ax
2592	mov ax, #0x1005
2593	out dx, ax
2594	ASM_END
2595	}
2596
2597	ASM_START
2598	idiv_u:
2599	xor dx,dx
2600	div bx
2601	ret
2602	ASM_END
2603
2604	static void set_scan_lines(lines) Bit8u lines;
2605	{
2606	Bit16u crtc_addr,cols,page,vde;
2607	Bit8u crtc_r9,ovl,rows;
2608
2609	crtc_addr = read_word(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS);
2610	outb(crtc_addr, 0x09);
2611	crtc_r9 = inb(crtc_addr+1);
2612	crtc_r9 = (crtc_r9 & 0xe0) \| (lines - 1);
2613	outb(crtc_addr+1, crtc_r9);
2614	if(lines==8)
2615	{
2616	biosfn_set_cursor_shape(0x06,0x07);
2617	}
2618	else
2619	{
2620	biosfn_set_cursor_shape(lines-4,lines-3);
2621	}
2622	write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT, lines);
2623	outb(crtc_addr, 0x12);
2624	vde = inb(crtc_addr+1);
2625	outb(crtc_addr, 0x07);
2626	ovl = inb(crtc_addr+1);
2627	vde += (((ovl & 0x02) << 7) + ((ovl & 0x40) << 3) + 1);
2628	rows = vde / lines;
2629	write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, rows-1);
2630	cols = read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
2631	write_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE, rows * cols * 2);
2632	}
2633
2634	static void biosfn_load_text_user_pat (AL,ES,BP,CX,DX,BL,BH) Bit8u AL;Bit16u ES;Bit16u BP;Bit16u CX;Bit16u DX;Bit8u BL;Bit8u BH;
2635	{
2636	Bit16u blockaddr,dest,i,src;
2637
2638	get_font_access();
2639	blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
2640	for(i=0;i<CX;i++)
2641	{
2642	src = BP + i * BH;
2643	dest = blockaddr + (DX + i) * 32;
2644	memcpyb(0xA000, dest, ES, src, BH);
2645	}
2646	release_font_access();
2647	if(AL>=0x10)
2648	{
2649	set_scan_lines(BH);
2650	}
2651	}
2652
2653	static void biosfn_load_text_8_14_pat (AL,BL) Bit8u AL;Bit8u BL;
2654	{
2655	Bit16u blockaddr,dest,i,src;
2656
2657	get_font_access();
2658	blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
2659	for(i=0;i<0x100;i++)
2660	{
2661	src = i * 14;
2662	dest = blockaddr + i * 32;
2663	memcpyb(0xA000, dest, 0xC000, vgafont14+src, 14);
2664	}
2665	release_font_access();
2666	if(AL>=0x10)
2667	{
2668	set_scan_lines(14);
2669	}
2670	}
2671
2672	static void biosfn_load_text_8_8_pat (AL,BL) Bit8u AL;Bit8u BL;
2673	{
2674	Bit16u blockaddr,dest,i,src;
2675
2676	get_font_access();
2677	blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
2678	for(i=0;i<0x100;i++)
2679	{
2680	src = i * 8;
2681	dest = blockaddr + i * 32;
2682	memcpyb(0xA000, dest, 0xC000, vgafont8+src, 8);
2683	}
2684	release_font_access();
2685	if(AL>=0x10)
2686	{
2687	set_scan_lines(8);
2688	}
2689	}
2690
2691	// --------------------------------------------------------------------------------------------
2692	ASM_START
2693	biosfn_set_text_block_specifier:
2694	push ax
2695	push dx
2696	mov dx, # VGAREG_SEQU_ADDRESS
2697	mov ah, bl
2698	mov al, #0x03
2699	out dx, ax
2700	pop dx
2701	pop ax
2702	ret
2703	ASM_END
2704
2705	// --------------------------------------------------------------------------------------------
2706	static void biosfn_load_text_8_16_pat (AL,BL) Bit8u AL;Bit8u BL;
2707	{
2708	Bit16u blockaddr,dest,i,src;
2709
2710	get_font_access();
2711	blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
2712	for(i=0;i<0x100;i++)
2713	{
2714	src = i * 16;
2715	dest = blockaddr + i * 32;
2716	memcpyb(0xA000, dest, 0xC000, vgafont16+src, 16);
2717	}
2718	release_font_access();
2719	if(AL>=0x10)
2720	{
2721	set_scan_lines(16);
2722	}
2723	}
2724
2725	static void biosfn_load_gfx_8_8_chars (ES,BP) Bit16u ES;Bit16u BP;
2726	{
2727	#ifdef DEBUG
2728	unimplemented();
2729	#endif
2730	}
2731	static void biosfn_load_gfx_user_chars (ES,BP,CX,BL,DL) Bit16u ES;Bit16u BP;Bit16u CX;Bit8u BL;Bit8u DL;
2732	{
2733	#ifdef DEBUG
2734	unimplemented();
2735	#endif
2736	}
2737	static void biosfn_load_gfx_8_14_chars (BL) Bit8u BL;
2738	{
2739	#ifdef DEBUG
2740	unimplemented();
2741	#endif
2742	}
2743	static void biosfn_load_gfx_8_8_dd_chars (BL) Bit8u BL;
2744	{
2745	#ifdef DEBUG
2746	unimplemented();
2747	#endif
2748	}
2749	static void biosfn_load_gfx_8_16_chars (BL) Bit8u BL;
2750	{
2751	#ifdef DEBUG
2752	unimplemented();
2753	#endif
2754	}
2755	// --------------------------------------------------------------------------------------------
2756	static void biosfn_get_font_info (BH,ES,BP,CX,DX)
2757	Bit8u BH;Bit16u ES;Bit16u BP;Bit16u CX;Bit16u DX;
2758	{Bit16u ss=get_SS();
2759
2760	switch(BH)
2761	{case 0x00:
2762	write_word(ss,ES,read_word(0x00,0x1f*4));
2763	write_word(ss,BP,read_word(0x00,(0x1f*4)+2));
2764	break;
2765	case 0x01:
2766	write_word(ss,ES,read_word(0x00,0x43*4));
2767	write_word(ss,BP,read_word(0x00,(0x43*4)+2));
2768	break;
2769	case 0x02:
2770	write_word(ss,ES,0xC000);
2771	write_word(ss,BP,vgafont14);
2772	break;
2773	case 0x03:
2774	write_word(ss,ES,0xC000);
2775	write_word(ss,BP,vgafont8);
2776	break;
2777	case 0x04:
2778	write_word(ss,ES,0xC000);
2779	write_word(ss,BP,vgafont8+128*8);
2780	break;
2781	case 0x05:
2782	write_word(ss,ES,0xC000);
2783	write_word(ss,BP,vgafont14alt);
2784	break;
2785	case 0x06:
2786	write_word(ss,ES,0xC000);
2787	write_word(ss,BP,vgafont16);
2788	break;
2789	case 0x07:
2790	write_word(ss,ES,0xC000);
2791	write_word(ss,BP,vgafont16alt);
2792	break;
2793	default:
2794	#ifdef DEBUG
2795	printf("Get font info BH(%02x) was discarded\n",BH);
2796	#endif
2797	return;
2798	}
2799	// Set byte/char of on screen font
2800	write_word(ss,CX,(Bit16u)read_byte(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT));
2801
2802	// Set Highest char row
2803	write_word(ss,DX,(Bit16u)read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS));
2804	}
2805
2806	// --------------------------------------------------------------------------------------------
2807	ASM_START
2808	biosfn_get_ega_info:
2809	push ds
2810	push ax
2811	mov ax, # BIOSMEM_SEG
2812	mov ds, ax
2813	xor ch, ch
2814	mov bx, # BIOSMEM_SWITCHES
2815	mov cl, [bx]
2816	and cl, #0x0f
2817	mov bx, # BIOSMEM_CRTC_ADDRESS
2818	mov ax, [bx]
2819	mov bx, #0x0003
2820	cmp ax, # VGAREG_MDA_CRTC_ADDRESS
2821	jne mode_ega_color
2822	mov bh, #0x01
2823	mode_ega_color:
2824	pop ax
2825	pop ds
2826	ret
2827	ASM_END
2828
2829	// --------------------------------------------------------------------------------------------
2830	static void biosfn_alternate_prtsc()
2831	{
2832	#ifdef DEBUG
2833	unimplemented();
2834	#endif
2835	}
2836
2837	// --------------------------------------------------------------------------------------------
2838	ASM_START
2839	biosfn_select_vert_res:
2840
2841	; res : 00 200 lines, 01 350 lines, 02 400 lines
2842
2843	push ds
2844	push bx
2845	push dx
2846	mov dl, al
2847	mov ax, # BIOSMEM_SEG
2848	mov ds, ax
2849	mov bx, # BIOSMEM_MODESET_CTL
2850	mov al, [bx]
2851	mov bx, # BIOSMEM_SWITCHES
2852	mov ah, [bx]
2853	cmp dl, #0x01
2854	je vert_res_350
2855	jb vert_res_200
2856	cmp dl, #0x02
2857	je vert_res_400
2858	#ifdef DEBUG
2859	mov al, dl
2860	xor ah, ah
2861	push ax
2862	mov bx, #msg_vert_res
2863	push bx
2864	call _printf
2865	add sp, #4
2866	#endif
2867	jmp set_retcode
2868	vert_res_400:
2869
2870	; reset modeset ctl bit 7 and set bit 4
2871	; set switches bit 3-0 to 0x09
2872
2873	and al, #0x7f
2874	or al, #0x10
2875	and ah, #0xf0
2876	or ah, #0x09
2877	jnz set_vert_res
2878	vert_res_350:
2879
2880	; reset modeset ctl bit 7 and bit 4
2881	; set switches bit 3-0 to 0x09
2882
2883	and al, #0x6f
2884	and ah, #0xf0
2885	or ah, #0x09
2886	jnz set_vert_res
2887	vert_res_200:
2888
2889	; set modeset ctl bit 7 and reset bit 4
2890	; set switches bit 3-0 to 0x08
2891
2892	and al, #0xef
2893	or al, #0x80
2894	and ah, #0xf0
2895	or ah, #0x08
2896	set_vert_res:
2897	mov bx, # BIOSMEM_MODESET_CTL
2898	mov [bx], al
2899	mov bx, # BIOSMEM_SWITCHES
2900	mov [bx], ah
2901	set_retcode:
2902	mov ax, #0x1212
2903	pop dx
2904	pop bx
2905	pop ds
2906	ret
2907
2908	#ifdef DEBUG
2909	msg_vert_res:
2910	.ascii "Select vert res (%02x) was discarded"
2911	.byte 0x0d,0x0a,0x00
2912	#endif
2913
2914
2915	biosfn_enable_default_palette_loading:
2916	push ds
2917	push bx
2918	push dx
2919	mov dl, al
2920	and dl, #0x01
2921	shl dl, 3
2922	mov ax, # BIOSMEM_SEG
2923	mov ds, ax
2924	mov bx, # BIOSMEM_MODESET_CTL
2925	mov al, [bx]
2926	and al, #0xf7
2927	or al, dl
2928	mov [bx], al
2929	mov ax, #0x1212
2930	pop dx
2931	pop bx
2932	pop ds
2933	ret
2934
2935
2936	biosfn_enable_video_addressing:
2937	push bx
2938	push dx
2939	mov bl, al
2940	and bl, #0x01
2941	xor bl, #0x01
2942	shl bl, 1
2943	mov dx, # VGAREG_READ_MISC_OUTPUT
2944	in al, dx
2945	and al, #0xfd
2946	or al, bl
2947	mov dx, # VGAREG_WRITE_MISC_OUTPUT
2948	out dx, al
2949	mov ax, #0x1212
2950	pop dx
2951	pop bx
2952	ret
2953
2954
2955	biosfn_enable_grayscale_summing:
2956	push ds
2957	push bx
2958	push dx
2959	mov dl, al
2960	and dl, #0x01
2961	xor dl, #0x01
2962	shl dl, 1
2963	mov ax, # BIOSMEM_SEG
2964	mov ds, ax
2965	mov bx, # BIOSMEM_MODESET_CTL
2966	mov al, [bx]
2967	and al, #0xfd
2968	or al, dl
2969	mov [bx], al
2970	mov ax, #0x1212
2971	pop dx
2972	pop bx
2973	pop ds
2974	ret
2975
2976
2977	biosfn_enable_cursor_emulation:
2978	push ds
2979	push bx
2980	push dx
2981	mov dl, al
2982	and dl, #0x01
2983	xor dl, #0x01
2984	mov ax, # BIOSMEM_SEG
2985	mov ds, ax
2986	mov bx, # BIOSMEM_MODESET_CTL
2987	mov al, [bx]
2988	and al, #0xfe
2989	or al, dl
2990	mov [bx], al
2991	mov ax, #0x1212
2992	pop dx
2993	pop bx
2994	pop ds
2995	ret
2996	ASM_END
2997
2998	// --------------------------------------------------------------------------------------------
2999	static void biosfn_switch_video_interface (AL,ES,DX) Bit8u AL;Bit16u ES;Bit16u DX;
3000	{
3001	#ifdef DEBUG
3002	unimplemented();
3003	#endif
3004	}
3005	static void biosfn_enable_video_refresh_control (AL) Bit8u AL;
3006	{
3007	#ifdef DEBUG
3008	unimplemented();
3009	#endif
3010	}
3011
3012	// --------------------------------------------------------------------------------------------
3013	static void biosfn_write_string (flag,page,attr,count,row,col,seg,offset)
3014	Bit8u flag;Bit8u page;Bit8u attr;Bit16u count;Bit8u row;Bit8u col;Bit16u seg;Bit16u offset;
3015	{
3016	Bit16u newcurs,oldcurs,dummy;
3017	Bit8u car,carattr;
3018
3019	// Read curs info for the page
3020	biosfn_get_cursor_pos(page,&dummy,&oldcurs);
3021
3022	// if row=0xff special case : use current cursor position
3023	if(row==0xff)
3024	{col=oldcurs&0x00ff;
3025	row=(oldcurs&0xff00)>>8;
3026	}
3027
3028	newcurs=row; newcurs<<=8; newcurs+=col;
3029	biosfn_set_cursor_pos(page,newcurs);
3030
3031	while(count--!=0)
3032	{
3033	car=read_byte(seg,offset++);
3034	if((flag&0x02)!=0)
3035	attr=read_byte(seg,offset++);
3036
3037	biosfn_write_teletype(car,page,attr,WITH_ATTR);
3038	}
3039
3040	// Set back curs pos
3041	if((flag&0x01)==0)
3042	biosfn_set_cursor_pos(page,oldcurs);
3043	}
3044
3045	// --------------------------------------------------------------------------------------------
3046	ASM_START
3047	biosfn_group_1A:
3048	cmp al, #0x00
3049	je biosfn_read_display_code
3050	cmp al, #0x01
3051	je biosfn_set_display_code
3052	#ifdef DEBUG
3053	call _unknown
3054	#endif
3055	ret
3056	biosfn_read_display_code:
3057	push ds
3058	push ax
3059	mov ax, # BIOSMEM_SEG
3060	mov ds, ax
3061	mov bx, # BIOSMEM_DCC_INDEX
3062	mov al, [bx]
3063	mov bl, al
3064	xor bh, bh
3065	pop ax
3066	mov al, ah
3067	pop ds
3068	ret
3069	biosfn_set_display_code:
3070	push ds
3071	push ax
3072	push bx
3073	mov ax, # BIOSMEM_SEG
3074	mov ds, ax
3075	mov ax, bx
3076	mov bx, # BIOSMEM_DCC_INDEX
3077	mov [bx], al
3078	#ifdef DEBUG
3079	mov al, ah
3080	xor ah, ah
3081	push ax
3082	mov bx, #msg_alt_dcc
3083	push bx
3084	call _printf
3085	add sp, #4
3086	#endif
3087	pop bx
3088	pop ax
3089	mov al, ah
3090	pop ds
3091	ret
3092
3093	#ifdef DEBUG
3094	msg_alt_dcc:
3095	.ascii "Alternate Display code (%02x) was discarded"
3096	.byte 0x0d,0x0a,0x00
3097	#endif
3098	ASM_END
3099
3100	// --------------------------------------------------------------------------------------------
3101	static void biosfn_read_state_info (BX,ES,DI)
3102	Bit16u BX;Bit16u ES;Bit16u DI;
3103	{
3104	// Address of static functionality table
3105	write_word(ES,DI+0x00,&static_functionality);
3106	write_word(ES,DI+0x02,0xC000);
3107
3108	// Hard coded copy from BIOS area. Should it be cleaner ?
3109	memcpyb(ES,DI+0x04,BIOSMEM_SEG,0x49,30);
3110	memcpyb(ES,DI+0x22,BIOSMEM_SEG,0x84,3);
3111
3112	write_byte(ES,DI+0x25,read_byte(BIOSMEM_SEG,BIOSMEM_DCC_INDEX));
3113	write_byte(ES,DI+0x26,0);
3114	write_byte(ES,DI+0x27,16);
3115	write_byte(ES,DI+0x28,0);
3116	write_byte(ES,DI+0x29,8);
3117	write_byte(ES,DI+0x2a,2);
3118	write_byte(ES,DI+0x2b,0);
3119	write_byte(ES,DI+0x2c,0);
3120	write_byte(ES,DI+0x31,3);
3121	write_byte(ES,DI+0x32,0);
3122
3123	memsetb(ES,DI+0x33,0,13);
3124	}
3125
3126	// --------------------------------------------------------------------------------------------
3127	static void biosfn_read_video_state_size (CX,ES,BX) Bit16u CX;Bit16u ES;Bit16u BX;
3128	{
3129	#ifdef DEBUG
3130	unimplemented();
3131	#endif
3132	}
3133	static void biosfn_save_video_state (CX,ES,BX) Bit16u CX;Bit16u ES;Bit16u BX;
3134	{
3135	#ifdef DEBUG
3136	unimplemented();
3137	#endif
3138	}
3139	static void biosfn_restore_video_state (CX,ES,BX) Bit16u CX;Bit16u ES;Bit16u BX;
3140	{
3141	#ifdef DEBUG
3142	unimplemented();
3143	#endif
3144	}
3145
3146	// ============================================================================================
3147	//
3148	// Video Utils
3149	//
3150	// ============================================================================================
3151
3152	// --------------------------------------------------------------------------------------------
3153	static Bit8u find_vga_entry(mode)
3154	Bit8u mode;
3155	{
3156	Bit8u i,line=0xFF;
3157	for(i=0;i<=MODE_MAX;i++)
3158	if(vga_modes[i].svgamode==mode)
3159	{line=i;
3160	break;
3161	}
3162	return line;
3163	}
3164
3165	/* =========================================================== */
3166	/*
3167	* Misc Utils
3168	*/
3169	/* =========================================================== */
3170
3171	// --------------------------------------------------------------------------------------------
3172	static void memsetb(seg,offset,value,count)
3173	Bit16u seg;
3174	Bit16u offset;
3175	Bit16u value;
3176	Bit16u count;
3177	{
3178	ASM_START
3179	push bp
3180	mov bp, sp
3181
3182	push ax
3183	push cx
3184	push es
3185	push di
3186
3187	mov cx, 10[bp] ; count
3188	cmp cx, #0x00
3189	je memsetb_end
3190	mov ax, 4[bp] ; segment
3191	mov es, ax
3192	mov ax, 6[bp] ; offset
3193	mov di, ax
3194	mov al, 8[bp] ; value
3195	cld
3196	rep
3197	stosb
3198
3199	memsetb_end:
3200	pop di
3201	pop es
3202	pop cx
3203	pop ax
3204
3205	pop bp
3206	ASM_END
3207	}
3208
3209	// --------------------------------------------------------------------------------------------
3210	static void memsetw(seg,offset,value,count)
3211	Bit16u seg;
3212	Bit16u offset;
3213	Bit16u value;
3214	Bit16u count;
3215	{
3216	ASM_START
3217	push bp
3218	mov bp, sp
3219
3220	push ax
3221	push cx
3222	push es
3223	push di
3224
3225	mov cx, 10[bp] ; count
3226	cmp cx, #0x00
3227	je memsetw_end
3228	mov ax, 4[bp] ; segment
3229	mov es, ax
3230	mov ax, 6[bp] ; offset
3231	mov di, ax
3232	mov ax, 8[bp] ; value
3233	cld
3234	rep
3235	stosw
3236
3237	memsetw_end:
3238	pop di
3239	pop es
3240	pop cx
3241	pop ax
3242
3243	pop bp
3244	ASM_END
3245	}
3246
3247	// --------------------------------------------------------------------------------------------
3248	static void memcpyb(dseg,doffset,sseg,soffset,count)
3249	Bit16u dseg;
3250	Bit16u doffset;
3251	Bit16u sseg;
3252	Bit16u soffset;
3253	Bit16u count;
3254	{
3255	ASM_START
3256	push bp
3257	mov bp, sp
3258
3259	push ax
3260	push cx
3261	push es
3262	push di
3263	push ds
3264	push si
3265
3266	mov cx, 12[bp] ; count
3267	cmp cx, #0x0000
3268	je memcpyb_end
3269	mov ax, 4[bp] ; dsegment
3270	mov es, ax
3271	mov ax, 6[bp] ; doffset
3272	mov di, ax
3273	mov ax, 8[bp] ; ssegment
3274	mov ds, ax
3275	mov ax, 10[bp] ; soffset
3276	mov si, ax
3277	cld
3278	rep
3279	movsb
3280
3281	memcpyb_end:
3282	pop si
3283	pop ds
3284	pop di
3285	pop es
3286	pop cx
3287	pop ax
3288
3289	pop bp
3290	ASM_END
3291	}
3292
3293	// --------------------------------------------------------------------------------------------
3294	static void memcpyw(dseg,doffset,sseg,soffset,count)
3295	Bit16u dseg;
3296	Bit16u doffset;
3297	Bit16u sseg;
3298	Bit16u soffset;
3299	Bit16u count;
3300	{
3301	ASM_START
3302	push bp
3303	mov bp, sp
3304
3305	push ax
3306	push cx
3307	push es
3308	push di
3309	push ds
3310	push si
3311
3312	mov cx, 12[bp] ; count
3313	cmp cx, #0x0000
3314	je memcpyw_end
3315	mov ax, 4[bp] ; dsegment
3316	mov es, ax
3317	mov ax, 6[bp] ; doffset
3318	mov di, ax
3319	mov ax, 8[bp] ; ssegment
3320	mov ds, ax
3321	mov ax, 10[bp] ; soffset
3322	mov si, ax
3323	cld
3324	rep
3325	movsw
3326
3327	memcpyw_end:
3328	pop si
3329	pop ds
3330	pop di
3331	pop es
3332	pop cx
3333	pop ax
3334
3335	pop bp
3336	ASM_END
3337	}
3338
3339	/* =========================================================== */
3340	/*
3341	* These functions where ripped from Kevin's rombios.c
3342	*/
3343	/* =========================================================== */
3344
3345	// --------------------------------------------------------------------------------------------
3346	static Bit8u
3347	read_byte(seg, offset)
3348	Bit16u seg;
3349	Bit16u offset;
3350	{
3351	ASM_START
3352	push bp
3353	mov bp, sp
3354
3355	push bx
3356	push ds
3357	mov ax, 4[bp] ; segment
3358	mov ds, ax
3359	mov bx, 6[bp] ; offset
3360	mov al, [bx]
3361	;; al = return value (byte)
3362	pop ds
3363	pop bx
3364
3365	pop bp
3366	ASM_END
3367	}
3368
3369	// --------------------------------------------------------------------------------------------
3370	static Bit16u
3371	read_word(seg, offset)
3372	Bit16u seg;
3373	Bit16u offset;
3374	{
3375	ASM_START
3376	push bp
3377	mov bp, sp
3378
3379	push bx
3380	push ds
3381	mov ax, 4[bp] ; segment
3382	mov ds, ax
3383	mov bx, 6[bp] ; offset
3384	mov ax, [bx]
3385	;; ax = return value (word)
3386	pop ds
3387	pop bx
3388
3389	pop bp
3390	ASM_END
3391	}
3392
3393	// --------------------------------------------------------------------------------------------
3394	static void
3395	write_byte(seg, offset, data)
3396	Bit16u seg;
3397	Bit16u offset;
3398	Bit8u data;
3399	{
3400	ASM_START
3401	push bp
3402	mov bp, sp
3403
3404	push ax
3405	push bx
3406	push ds
3407	mov ax, 4[bp] ; segment
3408	mov ds, ax
3409	mov bx, 6[bp] ; offset
3410	mov al, 8[bp] ; data byte
3411	mov [bx], al ; write data byte
3412	pop ds
3413	pop bx
3414	pop ax
3415
3416	pop bp
3417	ASM_END
3418	}
3419
3420	// --------------------------------------------------------------------------------------------
3421	static void
3422	write_word(seg, offset, data)
3423	Bit16u seg;
3424	Bit16u offset;
3425	Bit16u data;
3426	{
3427	ASM_START
3428	push bp
3429	mov bp, sp
3430
3431	push ax
3432	push bx
3433	push ds
3434	mov ax, 4[bp] ; segment
3435	mov ds, ax
3436	mov bx, 6[bp] ; offset
3437	mov ax, 8[bp] ; data word
3438	mov [bx], ax ; write data word
3439	pop ds
3440	pop bx
3441	pop ax
3442
3443	pop bp
3444	ASM_END
3445	}
3446
3447	// --------------------------------------------------------------------------------------------
3448	Bit8u
3449	inb(port)
3450	Bit16u port;
3451	{
3452	ASM_START
3453	push bp
3454	mov bp, sp
3455
3456	push dx
3457	mov dx, 4[bp]
3458	in al, dx
3459	pop dx
3460
3461	pop bp
3462	ASM_END
3463	}
3464
3465	Bit16u
3466	inw(port)
3467	Bit16u port;
3468	{
3469	ASM_START
3470	push bp
3471	mov bp, sp
3472
3473	push dx
3474	mov dx, 4[bp]
3475	in ax, dx
3476	pop dx
3477
3478	pop bp
3479	ASM_END
3480	}
3481
3482	// --------------------------------------------------------------------------------------------
3483	void
3484	outb(port, val)
3485	Bit16u port;
3486	Bit8u val;
3487	{
3488	ASM_START
3489	push bp
3490	mov bp, sp
3491
3492	push ax
3493	push dx
3494	mov dx, 4[bp]
3495	mov al, 6[bp]
3496	out dx, al
3497	pop dx
3498	pop ax
3499
3500	pop bp
3501	ASM_END
3502	}
3503
3504	// --------------------------------------------------------------------------------------------
3505	void
3506	outw(port, val)
3507	Bit16u port;
3508	Bit16u val;
3509	{
3510	ASM_START
3511	push bp
3512	mov bp, sp
3513
3514	push ax
3515	push dx
3516	mov dx, 4[bp]
3517	mov ax, 6[bp]
3518	out dx, ax
3519	pop dx
3520	pop ax
3521
3522	pop bp
3523	ASM_END
3524	}
3525
3526	Bit16u get_SS()
3527	{
3528	ASM_START
3529	mov ax, ss
3530	ASM_END
3531	}
3532
3533	#ifdef DEBUG
3534	void unimplemented()
3535	{
3536	printf("--> Unimplemented\n");
3537	}
3538
3539	void unknown()
3540	{
3541	printf("--> Unknown int10\n");
3542	}
3543	#endif
3544
3545	// --------------------------------------------------------------------------------------------
3546	void printf(s)
3547	Bit8u *s;
3548	{
3549	Bit8u c, format_char;
3550	Boolean in_format;
3551	unsigned format_width, i;
3552	Bit16u *arg_ptr;
3553	Bit16u arg_seg, arg, digit, nibble, shift_count;
3554
3555	arg_ptr = &s;
3556	arg_seg = get_SS();
3557
3558	in_format = 0;
3559	format_width = 0;
3560
3561	while (c = read_byte(0xc000, s)) {
3562	if ( c == '%' ) {
3563	in_format = 1;
3564	format_width = 0;
3565	}
3566	else if (in_format) {
3567	if ( (c>='0') && (c<='9') ) {
3568	format_width = (format_width * 10) + (c - '0');
3569	}
3570	else if (c == 'x') {
3571	arg_ptr++; // increment to next arg
3572	arg = read_word(arg_seg, arg_ptr);
3573	if (format_width == 0)
3574	format_width = 4;
3575	i = 0;
3576	digit = format_width - 1;
3577	for (i=0; i<format_width; i++) {
3578	nibble = (arg >> (4 * digit)) & 0x000f;
3579	if (nibble <= 9)
3580	outb(VBE_PRINTF_PORT, nibble + '0');
3581	else
3582	outb(VBE_PRINTF_PORT, (nibble - 10) + 'A');
3583	digit--;
3584	}
3585	in_format = 0;
3586	}
3587	//else if (c == 'd') {
3588	// in_format = 0;
3589	// }
3590	}
3591	else {
3592	outb(VBE_PRINTF_PORT, c);
3593	}
3594	s ++;
3595	}
3596	}
3597
3598	#ifdef VBE
3599	#include "vbe.c"
3600	#endif
3601
3602	#ifdef CIRRUS
3603	#include "clext.c"
3604	#endif
3605
3606	// --------------------------------------------------------------------------------------------
3607
3608	ASM_START
3609	;; DATA_SEG_DEFS_HERE
3610	ASM_END
3611
3612	ASM_START
3613	.ascii "vgabios ends here"
3614	.byte 0x00
3615	vgabios_end:
3616	.byte 0xCB
3617	;; BLOCK_STRINGS_BEGIN
3618	ASM_END

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source: vbox/trunk/src/VBox/Devices/Graphics/BIOS/vgabios.c@ 1

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