3 * Display adapter & video mode setup, version 2.13 (14-May-99)
5 * Copyright (C) 1995 -- 1998 Martin Mares <mj@ucw.cz>
6 * Based on the original setup.S code (C) Linus Torvalds and Mats Anderson
8 * Rewritten to use GNU 'as' by Chris Noe <stiker@northlink.com> May 1999
10 * For further information, look at Documentation/svga.txt.
14 #include <linux/config.h> /* for CONFIG_VIDEO_* */
16 /* Enable autodetection of SVGA adapters and modes. */
17 #undef CONFIG_VIDEO_SVGA
19 /* Enable autodetection of VESA modes */
20 #define CONFIG_VIDEO_VESA
22 /* Enable compacting of mode table */
23 #define CONFIG_VIDEO_COMPACT
25 /* Retain screen contents when switching modes */
26 #define CONFIG_VIDEO_RETAIN
28 /* Enable local mode list */
29 #undef CONFIG_VIDEO_LOCAL
31 /* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */
32 #undef CONFIG_VIDEO_400_HACK
34 /* Hack that lets you force specific BIOS mode ID and specific dimensions */
35 #undef CONFIG_VIDEO_GFX_HACK
36 #define VIDEO_GFX_BIOS_AX 0x4f02 /* 800x600 on ThinkPad */
37 #define VIDEO_GFX_BIOS_BX 0x0102
38 #define VIDEO_GFX_DUMMY_RESOLUTION 0x6425 /* 100x37 */
40 /* This code uses an extended set of video mode numbers. These include:
41 * Aliases for standard modes
45 * Video modes numbered by menu position -- NOT RECOMMENDED because of lack
46 * of compatibility when extending the table. These are between 0x00 and 0xff.
48 #define VIDEO_FIRST_MENU 0x0000
50 /* Standard BIOS video modes (BIOS number + 0x0100) */
51 #define VIDEO_FIRST_BIOS 0x0100
53 /* VESA BIOS video modes (VESA number + 0x0200) */
54 #define VIDEO_FIRST_VESA 0x0200
56 /* Video7 special modes (BIOS number + 0x0900) */
57 #define VIDEO_FIRST_V7 0x0900
59 /* Special video modes */
60 #define VIDEO_FIRST_SPECIAL 0x0f00
61 #define VIDEO_80x25 0x0f00
62 #define VIDEO_8POINT 0x0f01
63 #define VIDEO_80x43 0x0f02
64 #define VIDEO_80x28 0x0f03
65 #define VIDEO_CURRENT_MODE 0x0f04
66 #define VIDEO_80x30 0x0f05
67 #define VIDEO_80x34 0x0f06
68 #define VIDEO_80x60 0x0f07
69 #define VIDEO_LAST_SPECIAL 0x0f09
71 /* Video modes given by resolution */
72 #define VIDEO_FIRST_RESOLUTION 0x1000
74 /* The "recalculate timings" flag */
75 #define VIDEO_RECALC 0x8000
77 /* Positions of various video parameters passed to the kernel */
78 /* (see also include/linux/tty.h) */
79 #define PARAM_CURSOR_POS 0x00
80 #define PARAM_VIDEO_PAGE 0x04
81 #define PARAM_VIDEO_MODE 0x06
82 #define PARAM_VIDEO_COLS 0x07
83 #define PARAM_VIDEO_EGA_BX 0x0a
84 #define PARAM_VIDEO_LINES 0x0e
85 #define PARAM_HAVE_VGA 0x0f
86 #define PARAM_FONT_POINTS 0x10
88 #define PARAM_LFB_WIDTH 0x12
89 #define PARAM_LFB_HEIGHT 0x14
90 #define PARAM_LFB_DEPTH 0x16
91 #define PARAM_LFB_BASE 0x18
92 #define PARAM_LFB_SIZE 0x1c
93 #define PARAM_LFB_LINELENGTH 0x24
94 #define PARAM_LFB_COLORS 0x26
95 #define PARAM_VESAPM_SEG 0x2e
96 #define PARAM_VESAPM_OFF 0x30
97 #define PARAM_LFB_PAGES 0x32
98 #define PARAM_VESA_ATTRIB 0x34
101 /* Define DO_STORE according to CONFIG_VIDEO_RETAIN */
102 #ifdef CONFIG_VIDEO_RETAIN
103 #define DO_STORE call store_screen
106 #endif /* CONFIG_VIDEO_RETAIN */
108 # This is the main entry point called by setup.S
109 # %ds *must* be pointing to the bootsector
110 video: pushw %ds # We use different segments
111 pushw %ds # FS contains original DS
113 pushw %cs # DS is equal to CS
115 pushw %cs # ES is equal to CS
118 movw %ax, %gs # GS is zero
120 call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA)
121 #ifdef CONFIG_VIDEO_SELECT
122 movw %fs:(0x01fa), %ax # User selected video mode
123 cmpw $ASK_VGA, %ax # Bring up the menu
126 call mode_set # Set the mode
129 leaw badmdt, %si # Invalid mode ID
133 #ifdef CONFIG_VIDEO_RETAIN
134 call restore_screen # Restore screen contents
135 #endif /* CONFIG_VIDEO_RETAIN */
136 #endif /* CONFIG_VIDEO_SELECT */
137 call mode_params # Store mode parameters
138 popw %ds # Restore original DS
141 # Detect if we have CGA, MDA, EGA or VGA and pass it to the kernel.
143 movb $0, %fs:(PARAM_HAVE_VGA)
144 movb $0x12, %ah # Check EGA/VGA
147 movw %bx, %fs:(PARAM_VIDEO_EGA_BX) # Identifies EGA to the kernel
148 cmpb $0x10, %bl # No, it's a CGA/MDA/HGA card.
152 movw $0x1a00, %ax # Check EGA or VGA?
154 cmpb $0x1a, %al # 1a means VGA...
155 jne basret # anything else is EGA.
157 incb %fs:(PARAM_HAVE_VGA) # We've detected a VGA
161 # Store the video mode parameters for later usage by the kernel.
162 # This is done by asking the BIOS except for the rows/columns
163 # parameters in the default 80x25 mode -- these are set directly,
164 # because some very obscure BIOSes supply insane values.
166 #ifdef CONFIG_VIDEO_SELECT
167 cmpb $0, graphic_mode
170 movb $0x03, %ah # Read cursor position
173 movw %dx, %fs:(PARAM_CURSOR_POS)
174 movb $0x0f, %ah # Read page/mode/width
176 movw %bx, %fs:(PARAM_VIDEO_PAGE)
177 movw %ax, %fs:(PARAM_VIDEO_MODE) # Video mode and screen width
178 cmpb $0x7, %al # MDA/HGA => segment differs
181 movw $0xb000, video_segment
182 mopar0: movw %gs:(0x485), %ax # Font size
183 movw %ax, %fs:(PARAM_FONT_POINTS) # (valid only on EGA/VGA)
184 movw force_size, %ax # Forced size?
188 movb %ah, %fs:(PARAM_VIDEO_COLS)
189 movb %al, %fs:(PARAM_VIDEO_LINES)
192 mopar1: movb $25, %al
193 cmpb $0, adapter # If we are on CGA/MDA/HGA, the
194 jz mopar2 # screen must have 25 lines.
196 movb %gs:(0x484), %al # On EGA/VGA, use the EGA+ BIOS
197 incb %al # location of max lines.
198 mopar2: movb %al, %fs:(PARAM_VIDEO_LINES)
201 #ifdef CONFIG_VIDEO_SELECT
202 # Fetching of VESA frame buffer parameters
204 leaw modelist+1024, %di
205 movb $0x23, %fs:(PARAM_HAVE_VGA)
207 movw %ax, %fs:(PARAM_LFB_LINELENGTH)
209 movw %ax, %fs:(PARAM_LFB_WIDTH)
211 movw %ax, %fs:(PARAM_LFB_HEIGHT)
214 movw %ax, %fs:(PARAM_LFB_DEPTH)
217 movw %ax, %fs:(PARAM_LFB_PAGES)
219 movl %eax, %fs:(PARAM_LFB_BASE)
221 movl %eax, %fs:(PARAM_LFB_COLORS)
223 movl %eax, %fs:(PARAM_LFB_COLORS+4)
225 movw %ax, %fs:(PARAM_VESA_ATTRIB)
228 leaw modelist+1024, %di
233 movl %eax, %fs:(PARAM_LFB_SIZE)
234 # get protected mode interface informations
242 movw %es, %fs:(PARAM_VESAPM_SEG)
243 movw %di, %fs:(PARAM_VESAPM_OFF)
246 # The video mode menu
248 leaw keymsg, %si # "Return/Space/Timeout" message
253 cmpb $0x0d, %al # ENTER ?
254 je listm # yes - manual mode selection
256 cmpb $0x20, %al # SPACE ?
257 je defmd1 # no - repeat
262 defmd1: ret # No mode chosen? Default 80x25
264 listm: call mode_table # List mode table
265 listm0: leaw name_bann, %si # Print adapter name
286 leaw listhdr, %si # Table header
288 movb $0x30, %dl # DL holds mode number
290 lm1: cmpw $ASK_VGA, (%si) # End?
293 movb %dl, %al # Menu selection number
301 movb $0x78, %al # the letter 'x'
304 call prtdec # Columns
305 movb $0x0d, %al # New line
309 incb %dl # Next character
316 lm2: leaw prompt, %si # Mode prompt
318 leaw edit_buf, %di # Editor buffer
320 cmpb $0x0d, %al # Enter?
323 cmpb $0x08, %al # Backspace?
326 cmpb $0x20, %al # Printable?
329 cmpw $edit_buf+4, %di # Enough space?
336 lmbs: cmpw $edit_buf, %di # Backspace
347 lment: movb $0, (%di)
351 cmpb $0, (%si) # Empty string = default mode
354 cmpb $0, 1(%si) # One character = menu selection
357 cmpw $0x6373, (%si) # "scan" => mode scanning
363 lmhx: xorw %bx, %bx # Else => mode ID in hex
386 lmuse1: movw %bx, %ax
389 mnusel: lodsb # Menu selection
400 subb $0x61-0x30-10, %al
407 lmbad: leaw unknt, %si
410 lmscan: cmpb $0, adapter # Scanning only on EGA/VGA
413 movw $0, mt_end # Scanning of modes is
414 movb $1, scanning # done as new autodetection.
419 # Additional parts of mode_set... (relative jumps, you know)
420 setv7: # Video7 extended modes
422 subb $VIDEO_FIRST_V7>>8, %bh
428 _setrec: jmp setrec # Ugly...
429 _set_80x25: jmp set_80x25
431 # Aliases for backward compatibility.
433 movw $VIDEO_80x25, %ax
437 movb $VIDEO_8POINT-VIDEO_FIRST_SPECIAL, %al
439 jnz setbad # Fall-through!
441 # Setting of user mode (AX=mode ID) => CF=success
443 movw %ax, %fs:(0x01fa)
448 testb $VIDEO_RECALC>>8, %ah
451 cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
454 cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
457 cmpb $VIDEO_FIRST_V7>>8, %ah
460 cmpb $VIDEO_FIRST_VESA>>8, %ah
470 movb $0, do_restore # The screen needn't be restored
475 subb $VIDEO_FIRST_VESA>>8, %bh
476 movw $0x4f02, %ax # VESA BIOS mode set call
478 cmpw $0x004f, %ax # AL=4f if implemented
479 jnz setbad # AH=0 if OK
486 int $0x10 # Standard BIOS mode set call
488 movb $0x0f, %ah # Check if really set
497 setspc: xorb %bh, %bh # Set special mode
498 cmpb $VIDEO_LAST_SPECIAL-VIDEO_FIRST_SPECIAL, %bl
505 orb %al, %al # 80x25 is an exception
508 pushw %bx # Set mode chosen from menu
509 call mode_table # Build the mode table
516 movw (%si), %ax # Fetch mode ID
519 setres: pushw %bx # Set mode chosen by resolution
524 cmpw $ASK_VGA, %ax # End of the list?
531 movw -4(%si), %ax # Fetch mode ID
535 leaw modelist+1024, %di
536 subb $VIDEO_FIRST_VESA>>8, %bh
537 movw %bx, %cx # Get mode information structure
540 addb $VIDEO_FIRST_VESA>>8, %bh
544 movb (%di), %al # Check capabilities.
547 jz setvesa # This is a text mode
549 movb (%di), %al # Check capabilities.
552 jnz _setbad # Doh! No linear frame buffer.
554 subb $VIDEO_FIRST_VESA>>8, %bh
555 orw $0x4000, %bx # Use linear frame buffer
556 movw $0x4f02, %ax # VESA BIOS mode set call
558 cmpw $0x004f, %ax # AL=4f if implemented
559 jnz _setbad # AH=0 if OK
561 movb $1, graphic_mode # flag graphic mode
562 movb $0, do_restore # no screen restore
566 _setbad: jmp setbad # Ugly...
568 # Recalculate vertical display end registers -- this fixes various
569 # inconsistencies of extended modes on many adapters. Called when
570 # the VIDEO_RECALC flag is set in the mode ID.
572 setrec: subb $VIDEO_RECALC>>8, %ah # Set the base mode
576 movw %gs:(0x485), %ax # Font size in pixels
577 movb %gs:(0x484), %bl # Number of rows
579 mulb %bl # Number of visible
580 decw %ax # scan lines - 1
583 movb $0x12, %al # Lower 8 bits
586 movb $0x07, %al # Bits 8 and 9 in the overflow register
596 rct2: movb $0x07, %al
601 # Table of routines for setting of the special modes.
613 # Set the 80x25 mode. If already set, do nothing.
615 movw $0x5019, force_size # Override possibly broken BIOS
617 #ifdef CONFIG_VIDEO_400_HACK
618 movw $0x1202, %ax # Force 400 scan lines
622 movb $0x0f, %ah # Get current mode ID
624 cmpw $0x5007, %ax # Mode 7 (80x25 mono) is the only one available
625 jz st80 # on CGA/MDA/HGA and is also available on EGAM
627 cmpw $0x5003, %ax # Unknown mode, force 80x25 color
630 st80: cmpb $0, adapter # CGA/MDA/HGA => mode 3/7 is always 80x25
633 movb %gs:(0x0484), %al # This is EGA+ -- beware of 80x50 etc.
634 orb %al, %al # Some buggy BIOS'es set 0 rows
637 cmpb $24, %al # It's hopefully correct
639 #endif /* CONFIG_VIDEO_400_HACK */
641 movw $0x0003, %ax # Forced set
646 # Set the 80x50/80x43 8-pixel mode. Simple BIOS calls.
649 call use_80x25 # The base is 80x25
651 movw $0x1112, %ax # Use 8x8 font
654 movw $0x1200, %ax # Use alternate print screen
657 movw $0x1201, %ax # Turn off cursor emulation
660 movb $0x01, %ah # Define cursor scan lines 6-7
667 # Set the 80x28 mode. This mode works on all VGA's, because it's a standard
668 # 80x25 mode with 14-point fonts instead of 16-point.
671 call use_80x25 # The base is 80x25
672 set14: movw $0x1111, %ax # Use 9x14 font
675 movb $0x01, %ah # Define cursor scan lines 11-12
681 # Set the 80x43 mode. This mode is works on all VGA's.
682 # It's a 350-scanline mode with 8-pixel font.
685 movw $0x1201, %ax # Set 350 scans
688 movw $0x0003, %ax # Reset video mode
690 jmp set_8pt # Use 8-pixel font
692 # Set the 80x30 mode (all VGA's). 480 scanlines, 16-pixel font.
694 call use_80x25 # Start with real 80x25
696 movw $0x3cc, %dx # Get CRTC port
699 rorb %al # Mono or color?
703 set48a: movw $0x0c11, %ax # Vertical sync end (also unlocks CR0-7)
705 movw $0x0b06, %ax # Vertical total
707 movw $0x3e07, %ax # (Vertical) overflow
709 movw $0xea10, %ax # Vertical sync start
711 movw $0xdf12, %ax # Vertical display end
713 movw $0xe715, %ax # Vertical blank start
715 movw $0x0416, %ax # Vertical blank end
718 movb $0xcc, %dl # Misc output register (read)
720 movb $0xc2, %dl # (write)
721 andb $0x0d, %al # Preserve clock select bits and color bit
722 orb $0xe2, %al # Set correct sync polarity
725 movw $0x501e, force_size
729 # Set the 80x34 mode (all VGA's). 480 scans, 14-pixel font.
731 call set_80x30 # Set 480 scans
732 call set14 # And 14-pt font
733 movw $0xdb12, %ax # VGA vertical display end
734 movw $0x5022, force_size
739 # Set the 80x60 mode (all VGA's). 480 scans, 8-pixel font.
741 call set_80x30 # Set 480 scans
742 call set_8pt # And 8-pt font
743 movw $0xdf12, %ax # VGA vertical display end
744 movw $0x503c, force_size
750 #ifdef CONFIG_VIDEO_RETAIN
752 # Store screen contents to temporary buffer.
754 cmpb $0, do_restore # Already stored?
757 testb $CAN_USE_HEAP, loadflags # Have we space for storing?
762 pushw force_size # Don't force specific size
764 call mode_params # Obtain params of current mode
766 movb %fs:(PARAM_VIDEO_LINES), %ah
767 movb %fs:(PARAM_VIDEO_COLS), %al
768 movw %ax, %bx # BX=dimensions
770 movw %ax, %cx # CX=number of characters
771 addw %ax, %ax # Calculate image size
772 addw $modelist+1024+4, %ax
773 cmpw heap_end_ptr, %ax
774 jnc sts1 # Unfortunately, out of memory
776 movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params
777 leaw modelist+1024, %di
781 pushw %ds # Store the screen
782 movw video_segment, %ds
787 incb do_restore # Screen will be restored later
792 # Restore screen contents from temporary buffer.
794 cmpb $0, do_restore # Has the screen been stored?
797 call mode_params # Get parameters of current mode
798 movb %fs:(PARAM_VIDEO_LINES), %cl
799 movb %fs:(PARAM_VIDEO_COLS), %ch
800 leaw modelist+1024, %si # Screen buffer
801 lodsw # Set cursor position
813 res3: movb $0x02, %ah
817 movb %ah, %dl # DL=number of lines
818 movb $0, %ah # BX=phys. length of orig. line
820 cmpb %cl, %dl # Too many?
831 res4: cmpb %ch, %al # Too wide?
834 movb %ch, %al # AX=width of src. line
837 movw %cx, %bp # BP=width of dest. line
839 movw video_segment, %es
840 xorw %di, %di # Move the data
841 addw %bx, %bx # Convert BX and BP to _bytes_
857 #endif /* CONFIG_VIDEO_RETAIN */
859 # Write to indexed VGA register (AL=index, AH=data, DX=index reg. port)
860 outidx: outb %al, %dx
869 # Build the table of video modes (stored after the setup.S code at the
870 # `modelist' label. Each video mode record looks like:
871 # .word MODE-ID (our special mode ID (see above))
872 # .byte rows (number of rows)
873 # .byte columns (number of columns)
874 # Returns address of the end of the table in DI, the end is marked
877 movw mt_end, %di # Already filled?
881 leaw modelist, %di # Store standard modes:
882 movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL)
884 movb adapter, %al # CGA/MDA/HGA -- no more modes
891 movl $VIDEO_8POINT + 0x502b0000, %eax # The 80x43 EGA mode
897 mtabv: leaw vga_modes, %si # All modes for std VGA
898 movw $vga_modes_end-vga_modes, %cx
899 rep # I'm unable to use movsw as I don't know how to store a half
900 movsb # of the expression above to cx without using explicit shr.
902 cmpb $0, scanning # Mode scan requested?
908 #ifdef CONFIG_VIDEO_LOCAL
910 #endif /* CONFIG_VIDEO_LOCAL */
912 #ifdef CONFIG_VIDEO_VESA
913 call vesa_modes # Detect VESA VGA modes
914 #endif /* CONFIG_VIDEO_VESA */
916 #ifdef CONFIG_VIDEO_SVGA
917 cmpb $0, scanning # Bypass when scanning
920 call svga_modes # Detect SVGA cards & modes
922 #endif /* CONFIG_VIDEO_SVGA */
926 #ifdef CONFIG_VIDEO_COMPACT
930 cmt1: cmpw %dx, %si # Scan all modes
933 leaw modelist, %bx # Find in previous entries
938 cmpw 2(%bx), %cx # Found => don't copy this entry
944 cmt4: movsl # Copy entry
947 cmt5: addw $4, %si # Skip entry
951 #endif /* CONFIG_VIDEO_COMPACT */
953 movw $ASK_VGA, (%di) # End marker
955 mtab1: leaw modelist, %si # SI=mode list, DI=list end
958 # Modes usable on all standard VGAs
976 #ifdef CONFIG_VIDEO_VESA
978 cmpb $2, adapter # VGA only
981 movw %di, %bp # BP=original mode table end
982 addw $0x200, %di # Buffer space
983 movw $0x4f00, %ax # VESA Get card info call
986 cmpw $0x004f, %ax # Successful?
989 cmpw $0x4556, 0x200(%di)
992 cmpw $0x4153, 0x202(%di)
995 movw $vesa_name, card_name # Set name to "VESA VGA"
997 lgsw 0x20e(%di), %si # GS:SI=mode list
998 movw $128, %cx # Iteration limit
1000 # gas version 2.9.1, using BFD version 2.9.1.0.23 buggers the next inst.
1001 # XXX: lodsw %gs:(%si), %ax # Get next mode in the list
1003 cmpw $0xffff, %ax # End of the table?
1006 cmpw $0x0080, %ax # Check validity of mode ID
1009 orb %ah, %ah # Valid IDs: 0x0000-0x007f/0x0100-0x07ff
1010 jz vesan # Certain BIOSes report 0x80-0xff!
1016 movw %ax, %cx # Get mode information structure
1019 movw %cx, %bx # BX=mode number
1020 addb $VIDEO_FIRST_VESA>>8, %bh
1023 jnz vesan # Don't report errors (buggy BIOSES)
1025 movb (%di), %al # Check capabilities. We require
1026 andb $0x19, %al # a color text mode.
1030 cmpw $0xb800, 8(%di) # Standard video memory address required
1033 testb $2, (%di) # Mode characteristics supplied?
1034 movw %bx, (%di) # Store mode number
1038 movw 0x12(%di), %bx # Width
1043 movw 0x14(%di), %ax # Height
1049 cmpw $8193, %ax # Small enough for Linux console driver?
1054 vesa3: subw $0x8108, %bx # This mode has no detailed info specified,
1055 jc vesan # so it must be a standard VESA mode.
1060 movw vesa_text_mode_table(%bx), %ax
1062 vesaok: addw $4, %di # The mode is valid. Store it.
1063 vesan: loop vesa1 # Next mode. Limit exceeded => error
1064 vesae: leaw vesaer, %si
1066 movw %bp, %di # Discard already found modes.
1070 # Dimensions of standard VESA text modes
1071 vesa_text_mode_table:
1073 .byte 25, 132 # 0109
1074 .byte 43, 132 # 010A
1075 .byte 50, 132 # 010B
1076 .byte 60, 132 # 010C
1077 #endif /* CONFIG_VIDEO_VESA */
1079 # Scan for video modes. A bit dirty, but should work.
1081 movw $0x0100, %cx # Start with mode 0
1082 scm1: movb $0, %ah # Test the mode
1088 jnz scm2 # Mode not set
1090 movw $0x3c0, %dx # Test if it's a text mode
1091 movb $0x10, %al # Mode bits
1096 movb $0xce, %dl # Another set of mode bits
1102 movb $0xd4, %dl # Cursor location
1108 movw %cx, %ax # Ok, store the mode
1110 movb %gs:(0x484), %al # Number of rows
1113 movw %gs:(0x44a), %ax # Number of columns
1118 movw $0x0003, %ax # Return back to mode 3
1122 tstidx: outw %ax, %dx # OUT DX,AX and inidx
1123 inidx: outb %al, %dx # Read from indexed VGA register
1124 incw %dx # AL=index, DX=index reg port -> AL=data
1129 # Try to detect type of SVGA card and supply (usually approximate) video
1130 # mode table for it.
1132 #ifdef CONFIG_VIDEO_SVGA
1134 leaw svga_table, %si # Test all known SVGA adapters
1136 movw %ax, %bp # Default mode table
1140 lodsw # Pointer to test routine
1146 call *%ax # Call test routine
1153 movw %bp, %si # Found, copy the modes
1154 movb svga_prefix, %ah
1163 didsv: movw %si, card_name # Store pointer to card name
1166 # Table of all known SVGA cards. For each card, we store a pointer to
1167 # a table of video modes supported by the card and a pointer to a routine
1168 # used for testing of presence of the card. The video mode table is always
1169 # followed by the name of the card or the chipset.
1171 .word ati_md, ati_test
1172 .word oak_md, oak_test
1173 .word paradise_md, paradise_test
1174 .word realtek_md, realtek_test
1175 .word s3_md, s3_test
1176 .word chips_md, chips_test
1177 .word video7_md, video7_test
1178 .word cirrus5_md, cirrus5_test
1179 .word cirrus6_md, cirrus6_test
1180 .word cirrus1_md, cirrus1_test
1181 .word ahead_md, ahead_test
1182 .word everex_md, everex_test
1183 .word genoa_md, genoa_test
1184 .word trident_md, trident_test
1185 .word tseng_md, tseng_test
1188 # Test routines and mode tables:
1190 # S3 - The test algorithm was taken from the SuperProbe package
1191 # for XFree86 1.2.1. Report bugs to Christoph.Niemann@linux.org
1193 movw $0x0f35, %cx # we store some constants in cl/ch
1197 movb %al, %bh # store current CRT-register 0x38
1199 call outidx # disable writing to special regs
1200 movb %cl, %al # check whether we can write special reg 0x35
1202 movb %al, %bl # save the current value of CRT reg 0x35
1203 andb $0xf0, %al # clear bits 0-3
1205 movb %cl, %al # and write it to CRT reg 0x35
1207 call inidx # now read it back
1208 andb %ch, %al # clear the upper 4 bits
1209 jz s3_2 # the first test failed. But we have a
1211 movb %bl, %ah # second chance
1214 jmp s3_1 # do the other tests
1216 s3_2: movw %cx, %ax # load ah with 0xf and al with 0x35
1217 orb %bl, %ah # set the upper 4 bits of ah with the orig value
1218 call outidx # write ...
1219 call inidx # ... and reread
1220 andb %cl, %al # turn off the upper 4 bits
1222 movb %bl, %ah # restore old value in register 0x35
1226 cmpb %ch, %al # setting lower 4 bits was successful => bad
1227 je no_s3 # writing is allowed => this is not an S3
1229 s3_1: movw $0x4838, %ax # allow writing to special regs by putting
1230 call outidx # magic number into CRT-register 0x38
1231 movb %cl, %al # check whether we can write special reg 0x35
1240 jnz no_s3 # no, we can't write => no S3
1248 movb %bl, %ah # restore old value in register 0x35
1253 jne no_s31 # writing not possible => no S3
1255 call inidx # now get the S3 id ...
1266 no_s3: movb $0x35, %al # restore CRT register 0x35
1269 no_s31: xorw %bp, %bp # Detection failed
1270 s3rest: movb %bh, %ah
1271 movb $0x38, %al # restore old value of CRT register 0x38
1274 idS3: .byte 0x81, 0x82, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95
1275 .byte 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa8, 0xb0
1277 s3_md: .byte 0x54, 0x2b, 0x84
1278 .byte 0x55, 0x19, 0x84
1295 idati: .ascii "761295520"
1297 ati_md: .byte 0x23, 0x19, 0x84
1298 .byte 0x33, 0x2c, 0x84
1299 .byte 0x22, 0x1e, 0x64
1300 .byte 0x21, 0x19, 0x64
1301 .byte 0x58, 0x21, 0x50
1302 .byte 0x5b, 0x1e, 0x50
1324 .byte 0x22, 0x2c, 0x84
1325 .byte 0x23, 0x19, 0x84
1326 .byte 0x24, 0x1c, 0x84
1327 .byte 0x2f, 0x32, 0xa0
1328 .byte 0x32, 0x22, 0x50
1329 .byte 0x34, 0x42, 0x50
1354 .byte 0x60, 0x19, 0x84
1355 .byte 0x61, 0x32, 0x84
1357 .ascii "Chips & Technologies"
1398 nocirr: xorw %bp, %bp
1399 iscirr: movw $0x3d4, %dx
1408 .byte 0x1f, 0x19, 0x84
1409 .byte 0x20, 0x2c, 0x84
1410 .byte 0x22, 0x1e, 0x84
1411 .byte 0x31, 0x25, 0x64
1413 .ascii "Cirrus Logic 5X0"
1421 movb %al, %bl # BL=backup
1455 c5fail: xorw %bp, %bp
1456 c5done: movb $6, %al
1462 .byte 0x14, 0x19, 0x84
1463 .byte 0x54, 0x2b, 0x84
1465 .ascii "Cirrus Logic 54XX"
1468 # Cirrus Logic 64XX -- no known extra modes, but must be identified, because
1469 # it's misidentified by the Ahead test.
1474 movb %al, %bl # BL=backup
1486 call inidx # 4X, 5X, 7X and 8X are valid 64XX chip ID's.
1500 c2fail: xorw %bp, %bp
1501 c6done: movb $0x0a, %al
1508 .ascii "Cirrus Logic 64XX"
1526 evtrid: leaw trident_md, %bp
1529 noevrx: xorw %bp, %bp
1533 .byte 0x03, 0x22, 0x50
1534 .byte 0x04, 0x3c, 0x50
1535 .byte 0x07, 0x2b, 0x64
1536 .byte 0x08, 0x4b, 0x64
1537 .byte 0x0a, 0x19, 0x84
1538 .byte 0x0b, 0x2c, 0x84
1539 .byte 0x16, 0x1e, 0x50
1540 .byte 0x18, 0x1b, 0x64
1541 .byte 0x21, 0x40, 0xa0
1542 .byte 0x40, 0x1e, 0x84
1544 .ascii "Everex/Trident"
1549 leaw idgenoa, %si # Check Genoa 'clues'
1551 movb %es:(0x37), %al
1570 idgenoa: .byte 0x77, 0x00, 0x99, 0x66
1573 .byte 0x58, 0x20, 0x50
1574 .byte 0x5a, 0x2a, 0x64
1575 .byte 0x60, 0x19, 0x84
1576 .byte 0x61, 0x1d, 0x84
1577 .byte 0x62, 0x20, 0x84
1578 .byte 0x63, 0x2c, 0x84
1579 .byte 0x64, 0x3c, 0x84
1580 .byte 0x6b, 0x4f, 0x64
1581 .byte 0x72, 0x3c, 0x50
1582 .byte 0x74, 0x42, 0x50
1583 .byte 0x78, 0x4b, 0x64
1600 idoakvga: .ascii "OAK VGA "
1602 oak_md: .byte 0x4e, 0x3c, 0x50
1603 .byte 0x4f, 0x3c, 0x84
1604 .byte 0x50, 0x19, 0x84
1605 .byte 0x51, 0x2b, 0x84
1612 leaw idparadise, %si
1622 idparadise: .ascii "VGA="
1625 .byte 0x41, 0x22, 0x50
1626 .byte 0x47, 0x1c, 0x84
1627 .byte 0x55, 0x19, 0x84
1628 .byte 0x54, 0x2c, 0x84
1645 movb %al, %bl # Strange thing ... in the book this wasn't
1646 andb $0x02, %bl # necessary but it worked on my card which
1647 jz setb2 # is a trident. Without it the screen goes
1652 setb2: orb $0x02, %al
1653 clrb2: outb %al, %dx
1662 .byte 0x50, 0x1e, 0x50
1663 .byte 0x51, 0x2b, 0x50
1664 .byte 0x52, 0x3c, 0x50
1665 .byte 0x57, 0x19, 0x84
1666 .byte 0x58, 0x1e, 0x84
1667 .byte 0x59, 0x2b, 0x84
1668 .byte 0x5a, 0x3c, 0x84
1676 inb %dx, %al # Could things be this simple ! :-)
1687 isnot: xorw %bp, %bp
1691 .byte 0x26, 0x3c, 0x50
1692 .byte 0x2a, 0x28, 0x64
1693 .byte 0x23, 0x19, 0x84
1694 .byte 0x24, 0x1c, 0x84
1695 .byte 0x22, 0x2c, 0x84
1696 .byte 0x21, 0x3c, 0x84
1710 even7: movb $0x0c, %al
1735 movb $VIDEO_FIRST_V7>>8, svga_prefix # Use special mode switching
1739 .byte 0x40, 0x2b, 0x50
1740 .byte 0x43, 0x3c, 0x50
1741 .byte 0x44, 0x3c, 0x64
1742 .byte 0x41, 0x19, 0x84
1743 .byte 0x42, 0x2c, 0x84
1744 .byte 0x45, 0x1c, 0x84
1761 idrtvga: .ascii "REALTEK VGA"
1764 .byte 0x1a, 0x3c, 0x50
1765 .byte 0x1b, 0x19, 0x84
1766 .byte 0x1c, 0x1e, 0x84
1767 .byte 0x1d, 0x2b, 0x84
1768 .byte 0x1e, 0x3c, 0x84
1773 #endif /* CONFIG_VIDEO_SVGA */
1775 # User-defined local mode table (VGA only)
1776 #ifdef CONFIG_VIDEO_LOCAL
1778 leaw local_mode_table, %si
1789 # This is the table of local video modes which can be supplied manually
1790 # by the user. Each entry consists of mode ID (word) and dimensions
1791 # (byte for column count and another byte for row count). These modes
1792 # are placed before all SVGA and VESA modes and override them if table
1793 # compacting is enabled. The table must end with a zero word followed
1794 # by NUL-terminated video adapter name.
1796 .word 0x0100 # Example: 40x25
1801 #endif /* CONFIG_VIDEO_LOCAL */
1803 # Read a key and return the ASCII code in al, scan code in ah
1804 getkey: xorb %ah, %ah
1808 # Read a key with a timeout of 30 seconds.
1809 # The hardware clock is used to get the time.
1811 addb $30, %al # Wait 30 seconds
1818 again: movb $0x01, %ah
1820 jnz getkey # key pressed, so get it
1826 movb $0x20, %al # timeout, return `space'
1829 # Flush the keyboard buffer
1830 flush: movb $0x01, %ah
1840 # Print hexadecimal number.
1850 prthn: cmpb $0x0a, %al
1854 prth1: addb $0x30, %al
1857 # Print decimal number in al
1869 lt100: addb $0x30, %al
1871 skip10: movb %ah, %al
1878 # VIDEO_SELECT-only variables
1879 mt_end: .word 0 # End of video mode table if built
1880 edit_buf: .space 6 # Line editor buffer
1881 card_name: .word 0 # Pointer to adapter name
1882 scanning: .byte 0 # Performing mode scan
1883 do_restore: .byte 0 # Screen contents altered during mode change
1884 svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
1885 graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
1888 keymsg: .ascii "Press <RETURN> to see video modes available, "
1889 .ascii "<SPACE> to continue or wait 30 secs"
1892 listhdr: .byte 0x0d, 0x0a
1893 .ascii "Mode: COLSxROWS:"
1895 crlft: .byte 0x0d, 0x0a, 0
1897 prompt: .byte 0x0d, 0x0a
1898 .asciz "Enter mode number or `scan': "
1900 unknt: .asciz "Unknown mode ID. Try again."
1902 badmdt: .ascii "You passed an undefined mode number."
1905 vesaer: .ascii "Error: Scanning of VESA modes failed. Please "
1906 .ascii "report to <mj@ucw.cz>."
1909 old_name: .asciz "CGA/MDA/HGA"
1911 ega_name: .asciz "EGA"
1913 svga_name: .ascii " "
1915 vga_name: .asciz "VGA"
1917 vesa_name: .asciz "VESA"
1919 name_bann: .asciz "Video adapter: "
1920 #endif /* CONFIG_VIDEO_SELECT */
1923 adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA
1924 video_segment: .word 0xb800 # Video memory segment
1925 force_size: .word 0 # Use this size instead of the one in BIOS vars