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_GFX_HACK 0x0f08
70 #define VIDEO_LAST_SPECIAL 0x0f09
72 /* Video modes given by resolution */
73 #define VIDEO_FIRST_RESOLUTION 0x1000
75 /* The "recalculate timings" flag */
76 #define VIDEO_RECALC 0x8000
78 /* Positions of various video parameters passed to the kernel */
79 /* (see also include/linux/tty.h) */
80 #define PARAM_CURSOR_POS 0x00
81 #define PARAM_VIDEO_PAGE 0x04
82 #define PARAM_VIDEO_MODE 0x06
83 #define PARAM_VIDEO_COLS 0x07
84 #define PARAM_VIDEO_EGA_BX 0x0a
85 #define PARAM_VIDEO_LINES 0x0e
86 #define PARAM_HAVE_VGA 0x0f
87 #define PARAM_FONT_POINTS 0x10
89 #define PARAM_LFB_WIDTH 0x12
90 #define PARAM_LFB_HEIGHT 0x14
91 #define PARAM_LFB_DEPTH 0x16
92 #define PARAM_LFB_BASE 0x18
93 #define PARAM_LFB_SIZE 0x1c
94 #define PARAM_LFB_LINELENGTH 0x24
95 #define PARAM_LFB_COLORS 0x26
96 #define PARAM_VESAPM_SEG 0x2e
97 #define PARAM_VESAPM_OFF 0x30
98 #define PARAM_LFB_PAGES 0x32
99 #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
130 leaw badmdt, %si # Invalid mode ID
134 #endif /* CONFIG_VIDEO_IGNORE_BAD_MODE */
137 #ifdef CONFIG_VIDEO_RETAIN
138 call restore_screen # Restore screen contents
139 #endif /* CONFIG_VIDEO_RETAIN */
141 #endif /* CONFIG_VIDEO_SELECT */
142 call mode_params # Store mode parameters
143 popw %ds # Restore original DS
146 # Detect if we have CGA, MDA, EGA or VGA and pass it to the kernel.
148 movb $0, %fs:(PARAM_HAVE_VGA)
149 movb $0x12, %ah # Check EGA/VGA
152 movw %bx, %fs:(PARAM_VIDEO_EGA_BX) # Identifies EGA to the kernel
153 cmpb $0x10, %bl # No, it's a CGA/MDA/HGA card.
157 movw $0x1a00, %ax # Check EGA or VGA?
159 cmpb $0x1a, %al # 1a means VGA...
160 jne basret # anything else is EGA.
162 incb %fs:(PARAM_HAVE_VGA) # We've detected a VGA
166 # Store the video mode parameters for later usage by the kernel.
167 # This is done by asking the BIOS except for the rows/columns
168 # parameters in the default 80x25 mode -- these are set directly,
169 # because some very obscure BIOSes supply insane values.
171 #ifdef CONFIG_VIDEO_SELECT
172 cmpb $0, graphic_mode
175 movb $0x03, %ah # Read cursor position
178 movw %dx, %fs:(PARAM_CURSOR_POS)
179 movb $0x0f, %ah # Read page/mode/width
181 movw %bx, %fs:(PARAM_VIDEO_PAGE)
182 movw %ax, %fs:(PARAM_VIDEO_MODE) # Video mode and screen width
183 cmpb $0x7, %al # MDA/HGA => segment differs
186 movw $0xb000, video_segment
187 mopar0: movw %gs:(0x485), %ax # Font size
188 movw %ax, %fs:(PARAM_FONT_POINTS) # (valid only on EGA/VGA)
189 movw force_size, %ax # Forced size?
193 movb %ah, %fs:(PARAM_VIDEO_COLS)
194 movb %al, %fs:(PARAM_VIDEO_LINES)
197 mopar1: movb $25, %al
198 cmpb $0, adapter # If we are on CGA/MDA/HGA, the
199 jz mopar2 # screen must have 25 lines.
201 movb %gs:(0x484), %al # On EGA/VGA, use the EGA+ BIOS
202 incb %al # location of max lines.
203 mopar2: movb %al, %fs:(PARAM_VIDEO_LINES)
206 #ifdef CONFIG_VIDEO_SELECT
207 # Fetching of VESA frame buffer parameters
209 leaw modelist+1024, %di
210 movb $0x23, %fs:(PARAM_HAVE_VGA)
212 movw %ax, %fs:(PARAM_LFB_LINELENGTH)
214 movw %ax, %fs:(PARAM_LFB_WIDTH)
216 movw %ax, %fs:(PARAM_LFB_HEIGHT)
219 movw %ax, %fs:(PARAM_LFB_DEPTH)
222 movw %ax, %fs:(PARAM_LFB_PAGES)
224 movl %eax, %fs:(PARAM_LFB_BASE)
226 movl %eax, %fs:(PARAM_LFB_COLORS)
228 movl %eax, %fs:(PARAM_LFB_COLORS+4)
230 movw %ax, %fs:(PARAM_VESA_ATTRIB)
233 leaw modelist+1024, %di
238 movl %eax, %fs:(PARAM_LFB_SIZE)
240 # switching the DAC to 8-bit is for <= 8 bpp only
241 movw %fs:(PARAM_LFB_DEPTH), %ax
245 # get DAC switching capability
251 # attempt to switch DAC to 8-bit
257 movb %bh, dac_size # store actual DAC size
260 # set color size to DAC size
262 movb %al, %fs:(PARAM_LFB_COLORS+0)
263 movb %al, %fs:(PARAM_LFB_COLORS+2)
264 movb %al, %fs:(PARAM_LFB_COLORS+4)
265 movb %al, %fs:(PARAM_LFB_COLORS+6)
267 # set color offsets to 0
268 movb $0, %fs:(PARAM_LFB_COLORS+1)
269 movb $0, %fs:(PARAM_LFB_COLORS+3)
270 movb $0, %fs:(PARAM_LFB_COLORS+5)
271 movb $0, %fs:(PARAM_LFB_COLORS+7)
274 # get protected mode interface informations
282 movw %es, %fs:(PARAM_VESAPM_SEG)
283 movw %di, %fs:(PARAM_VESAPM_OFF)
286 # The video mode menu
288 leaw keymsg, %si # "Return/Space/Timeout" message
293 cmpb $0x0d, %al # ENTER ?
294 je listm # yes - manual mode selection
296 cmpb $0x20, %al # SPACE ?
297 je defmd1 # no - repeat
302 defmd1: ret # No mode chosen? Default 80x25
304 listm: call mode_table # List mode table
305 listm0: leaw name_bann, %si # Print adapter name
326 leaw listhdr, %si # Table header
328 movb $0x30, %dl # DL holds mode number
330 lm1: cmpw $ASK_VGA, (%si) # End?
333 movb %dl, %al # Menu selection number
341 movb $0x78, %al # the letter 'x'
344 call prtdec # Columns
345 movb $0x0d, %al # New line
349 incb %dl # Next character
356 lm2: leaw prompt, %si # Mode prompt
358 leaw edit_buf, %di # Editor buffer
360 cmpb $0x0d, %al # Enter?
363 cmpb $0x08, %al # Backspace?
366 cmpb $0x20, %al # Printable?
369 cmpw $edit_buf+4, %di # Enough space?
376 lmbs: cmpw $edit_buf, %di # Backspace
387 lment: movb $0, (%di)
391 cmpb $0, (%si) # Empty string = default mode
394 cmpb $0, 1(%si) # One character = menu selection
397 cmpw $0x6373, (%si) # "scan" => mode scanning
403 lmhx: xorw %bx, %bx # Else => mode ID in hex
426 lmuse1: movw %bx, %ax
429 mnusel: lodsb # Menu selection
440 subb $0x61-0x30-10, %al
447 lmbad: leaw unknt, %si
450 lmscan: cmpb $0, adapter # Scanning only on EGA/VGA
453 movw $0, mt_end # Scanning of modes is
454 movb $1, scanning # done as new autodetection.
459 # Additional parts of mode_set... (relative jumps, you know)
460 setv7: # Video7 extended modes
462 subb $VIDEO_FIRST_V7>>8, %bh
468 _setrec: jmp setrec # Ugly...
469 _set_80x25: jmp set_80x25
471 # Aliases for backward compatibility.
473 movw $VIDEO_80x25, %ax
477 movb $VIDEO_8POINT-VIDEO_FIRST_SPECIAL, %al
479 jnz setbad # Fall-through!
481 # Setting of user mode (AX=mode ID) => CF=success
483 movw %ax, %fs:(0x01fa) # Store mode for use in acpi_wakeup.S
488 testb $VIDEO_RECALC>>8, %ah
491 cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
494 cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
497 cmpb $VIDEO_FIRST_V7>>8, %ah
500 cmpb $VIDEO_FIRST_VESA>>8, %ah
510 movb $0, do_restore # The screen needn't be restored
515 subb $VIDEO_FIRST_VESA>>8, %bh
516 movw $0x4f02, %ax # VESA BIOS mode set call
518 cmpw $0x004f, %ax # AL=4f if implemented
519 jnz setbad # AH=0 if OK
526 int $0x10 # Standard BIOS mode set call
528 movb $0x0f, %ah # Check if really set
537 setspc: xorb %bh, %bh # Set special mode
538 cmpb $VIDEO_LAST_SPECIAL-VIDEO_FIRST_SPECIAL, %bl
545 orb %al, %al # 80x25 is an exception
548 pushw %bx # Set mode chosen from menu
549 call mode_table # Build the mode table
556 movw (%si), %ax # Fetch mode ID
559 setres: pushw %bx # Set mode chosen by resolution
564 cmpw $ASK_VGA, %ax # End of the list?
571 movw -4(%si), %ax # Fetch mode ID
575 leaw modelist+1024, %di
576 subb $VIDEO_FIRST_VESA>>8, %bh
577 movw %bx, %cx # Get mode information structure
580 addb $VIDEO_FIRST_VESA>>8, %bh
584 movb (%di), %al # Check capabilities.
587 jz setvesa # This is a text mode
589 movb (%di), %al # Check capabilities.
592 jnz _setbad # Doh! No linear frame buffer.
594 subb $VIDEO_FIRST_VESA>>8, %bh
595 orw $0x4000, %bx # Use linear frame buffer
596 movw $0x4f02, %ax # VESA BIOS mode set call
598 cmpw $0x004f, %ax # AL=4f if implemented
599 jnz _setbad # AH=0 if OK
601 movb $1, graphic_mode # flag graphic mode
602 movb $0, do_restore # no screen restore
606 _setbad: jmp setbad # Ugly...
608 # Recalculate vertical display end registers -- this fixes various
609 # inconsistencies of extended modes on many adapters. Called when
610 # the VIDEO_RECALC flag is set in the mode ID.
612 setrec: subb $VIDEO_RECALC>>8, %ah # Set the base mode
616 movw %gs:(0x485), %ax # Font size in pixels
617 movb %gs:(0x484), %bl # Number of rows
619 mulb %bl # Number of visible
620 decw %ax # scan lines - 1
623 movb $0x12, %al # Lower 8 bits
626 movb $0x07, %al # Bits 8 and 9 in the overflow register
636 rct2: movb $0x07, %al
641 # Table of routines for setting of the special modes.
653 # Set the 80x25 mode. If already set, do nothing.
655 movw $0x5019, force_size # Override possibly broken BIOS
657 #ifdef CONFIG_VIDEO_400_HACK
658 movw $0x1202, %ax # Force 400 scan lines
662 movb $0x0f, %ah # Get current mode ID
664 cmpw $0x5007, %ax # Mode 7 (80x25 mono) is the only one available
665 jz st80 # on CGA/MDA/HGA and is also available on EGAM
667 cmpw $0x5003, %ax # Unknown mode, force 80x25 color
670 st80: cmpb $0, adapter # CGA/MDA/HGA => mode 3/7 is always 80x25
673 movb %gs:(0x0484), %al # This is EGA+ -- beware of 80x50 etc.
674 orb %al, %al # Some buggy BIOS'es set 0 rows
677 cmpb $24, %al # It's hopefully correct
679 #endif /* CONFIG_VIDEO_400_HACK */
681 movw $0x0003, %ax # Forced set
686 # Set the 80x50/80x43 8-pixel mode. Simple BIOS calls.
689 call use_80x25 # The base is 80x25
691 movw $0x1112, %ax # Use 8x8 font
694 movw $0x1200, %ax # Use alternate print screen
697 movw $0x1201, %ax # Turn off cursor emulation
700 movb $0x01, %ah # Define cursor scan lines 6-7
707 # Set the 80x28 mode. This mode works on all VGA's, because it's a standard
708 # 80x25 mode with 14-point fonts instead of 16-point.
711 call use_80x25 # The base is 80x25
712 set14: movw $0x1111, %ax # Use 9x14 font
715 movb $0x01, %ah # Define cursor scan lines 11-12
721 # Set the 80x43 mode. This mode is works on all VGA's.
722 # It's a 350-scanline mode with 8-pixel font.
725 movw $0x1201, %ax # Set 350 scans
728 movw $0x0003, %ax # Reset video mode
730 jmp set_8pt # Use 8-pixel font
732 # Set the 80x30 mode (all VGA's). 480 scanlines, 16-pixel font.
734 call use_80x25 # Start with real 80x25
736 movw $0x3cc, %dx # Get CRTC port
739 rorb %al # Mono or color?
743 set48a: movw $0x0c11, %ax # Vertical sync end (also unlocks CR0-7)
745 movw $0x0b06, %ax # Vertical total
747 movw $0x3e07, %ax # (Vertical) overflow
749 movw $0xea10, %ax # Vertical sync start
751 movw $0xdf12, %ax # Vertical display end
753 movw $0xe715, %ax # Vertical blank start
755 movw $0x0416, %ax # Vertical blank end
758 movb $0xcc, %dl # Misc output register (read)
760 movb $0xc2, %dl # (write)
761 andb $0x0d, %al # Preserve clock select bits and color bit
762 orb $0xe2, %al # Set correct sync polarity
765 movw $0x501e, force_size
769 # Set the 80x34 mode (all VGA's). 480 scans, 14-pixel font.
771 call set_80x30 # Set 480 scans
772 call set14 # And 14-pt font
773 movw $0xdb12, %ax # VGA vertical display end
774 movw $0x5022, force_size
779 # Set the 80x60 mode (all VGA's). 480 scans, 8-pixel font.
781 call set_80x30 # Set 480 scans
782 call set_8pt # And 8-pt font
783 movw $0xdf12, %ax # VGA vertical display end
784 movw $0x503c, force_size
787 # Special hack for ThinkPad graphics
789 #ifdef CONFIG_VIDEO_GFX_HACK
790 movw $VIDEO_GFX_BIOS_AX, %ax
791 movw $VIDEO_GFX_BIOS_BX, %bx
793 movw $VIDEO_GFX_DUMMY_RESOLUTION, force_size
798 #ifdef CONFIG_VIDEO_RETAIN
800 # Store screen contents to temporary buffer.
802 cmpb $0, do_restore # Already stored?
805 testb $CAN_USE_HEAP, loadflags # Have we space for storing?
810 pushw force_size # Don't force specific size
812 call mode_params # Obtain params of current mode
814 movb %fs:(PARAM_VIDEO_LINES), %ah
815 movb %fs:(PARAM_VIDEO_COLS), %al
816 movw %ax, %bx # BX=dimensions
818 movw %ax, %cx # CX=number of characters
819 addw %ax, %ax # Calculate image size
820 addw $modelist+1024+4, %ax
821 cmpw heap_end_ptr, %ax
822 jnc sts1 # Unfortunately, out of memory
824 movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params
825 leaw modelist+1024, %di
829 pushw %ds # Store the screen
830 movw video_segment, %ds
835 incb do_restore # Screen will be restored later
840 # Restore screen contents from temporary buffer.
842 cmpb $0, do_restore # Has the screen been stored?
845 call mode_params # Get parameters of current mode
846 movb %fs:(PARAM_VIDEO_LINES), %cl
847 movb %fs:(PARAM_VIDEO_COLS), %ch
848 leaw modelist+1024, %si # Screen buffer
849 lodsw # Set cursor position
861 res3: movb $0x02, %ah
865 movb %ah, %dl # DL=number of lines
866 movb $0, %ah # BX=phys. length of orig. line
868 cmpb %cl, %dl # Too many?
879 res4: cmpb %ch, %al # Too wide?
882 movb %ch, %al # AX=width of src. line
885 movw %cx, %bp # BP=width of dest. line
887 movw video_segment, %es
888 xorw %di, %di # Move the data
889 addw %bx, %bx # Convert BX and BP to _bytes_
905 #endif /* CONFIG_VIDEO_RETAIN */
907 # Write to indexed VGA register (AL=index, AH=data, DX=index reg. port)
908 outidx: outb %al, %dx
917 # Build the table of video modes (stored after the setup.S code at the
918 # `modelist' label. Each video mode record looks like:
919 # .word MODE-ID (our special mode ID (see above))
920 # .byte rows (number of rows)
921 # .byte columns (number of columns)
922 # Returns address of the end of the table in DI, the end is marked
925 movw mt_end, %di # Already filled?
929 leaw modelist, %di # Store standard modes:
930 movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL)
932 movb adapter, %al # CGA/MDA/HGA -- no more modes
939 movl $VIDEO_8POINT + 0x502b0000, %eax # The 80x43 EGA mode
945 mtabv: leaw vga_modes, %si # All modes for std VGA
946 movw $vga_modes_end-vga_modes, %cx
947 rep # I'm unable to use movsw as I don't know how to store a half
948 movsb # of the expression above to cx without using explicit shr.
950 cmpb $0, scanning # Mode scan requested?
956 #ifdef CONFIG_VIDEO_LOCAL
958 #endif /* CONFIG_VIDEO_LOCAL */
960 #ifdef CONFIG_VIDEO_VESA
961 call vesa_modes # Detect VESA VGA modes
962 #endif /* CONFIG_VIDEO_VESA */
964 #ifdef CONFIG_VIDEO_SVGA
965 cmpb $0, scanning # Bypass when scanning
968 call svga_modes # Detect SVGA cards & modes
970 #endif /* CONFIG_VIDEO_SVGA */
974 #ifdef CONFIG_VIDEO_COMPACT
978 cmt1: cmpw %dx, %si # Scan all modes
981 leaw modelist, %bx # Find in previous entries
986 cmpw 2(%bx), %cx # Found => don't copy this entry
992 cmt4: movsl # Copy entry
995 cmt5: addw $4, %si # Skip entry
999 #endif /* CONFIG_VIDEO_COMPACT */
1001 movw $ASK_VGA, (%di) # End marker
1003 mtab1: leaw modelist, %si # SI=mode list, DI=list end
1006 # Modes usable on all standard VGAs
1009 .word 0x5032 # 80x50
1011 .word 0x502b # 80x43
1013 .word 0x501c # 80x28
1015 .word 0x501e # 80x30
1017 .word 0x5022 # 80x34
1019 .word 0x503c # 80x60
1020 #ifdef CONFIG_VIDEO_GFX_HACK
1021 .word VIDEO_GFX_HACK
1022 .word VIDEO_GFX_DUMMY_RESOLUTION
1026 # Detect VESA modes.
1028 #ifdef CONFIG_VIDEO_VESA
1030 cmpb $2, adapter # VGA only
1033 movw %di, %bp # BP=original mode table end
1034 addw $0x200, %di # Buffer space
1035 movw $0x4f00, %ax # VESA Get card info call
1038 cmpw $0x004f, %ax # Successful?
1041 cmpw $0x4556, 0x200(%di)
1044 cmpw $0x4153, 0x202(%di)
1047 movw $vesa_name, card_name # Set name to "VESA VGA"
1049 lgsw 0x20e(%di), %si # GS:SI=mode list
1050 movw $128, %cx # Iteration limit
1052 # gas version 2.9.1, using BFD version 2.9.1.0.23 buggers the next inst.
1053 # XXX: lodsw %gs:(%si), %ax # Get next mode in the list
1055 cmpw $0xffff, %ax # End of the table?
1058 cmpw $0x0080, %ax # Check validity of mode ID
1061 orb %ah, %ah # Valid IDs: 0x0000-0x007f/0x0100-0x07ff
1062 jz vesan # Certain BIOSes report 0x80-0xff!
1068 movw %ax, %cx # Get mode information structure
1071 movw %cx, %bx # BX=mode number
1072 addb $VIDEO_FIRST_VESA>>8, %bh
1075 jnz vesan # Don't report errors (buggy BIOSES)
1077 movb (%di), %al # Check capabilities. We require
1078 andb $0x19, %al # a color text mode.
1082 cmpw $0xb800, 8(%di) # Standard video memory address required
1085 testb $2, (%di) # Mode characteristics supplied?
1086 movw %bx, (%di) # Store mode number
1090 movw 0x12(%di), %bx # Width
1095 movw 0x14(%di), %ax # Height
1101 cmpw $8193, %ax # Small enough for Linux console driver?
1106 vesa3: subw $0x8108, %bx # This mode has no detailed info specified,
1107 jc vesan # so it must be a standard VESA mode.
1112 movw vesa_text_mode_table(%bx), %ax
1114 vesaok: addw $4, %di # The mode is valid. Store it.
1115 vesan: loop vesa1 # Next mode. Limit exceeded => error
1116 vesae: leaw vesaer, %si
1118 movw %bp, %di # Discard already found modes.
1122 # Dimensions of standard VESA text modes
1123 vesa_text_mode_table:
1125 .byte 25, 132 # 0109
1126 .byte 43, 132 # 010A
1127 .byte 50, 132 # 010B
1128 .byte 60, 132 # 010C
1129 #endif /* CONFIG_VIDEO_VESA */
1131 # Scan for video modes. A bit dirty, but should work.
1133 movw $0x0100, %cx # Start with mode 0
1134 scm1: movb $0, %ah # Test the mode
1140 jnz scm2 # Mode not set
1142 movw $0x3c0, %dx # Test if it's a text mode
1143 movb $0x10, %al # Mode bits
1148 movb $0xce, %dl # Another set of mode bits
1154 movb $0xd4, %dl # Cursor location
1160 movw %cx, %ax # Ok, store the mode
1162 movb %gs:(0x484), %al # Number of rows
1165 movw %gs:(0x44a), %ax # Number of columns
1170 movw $0x0003, %ax # Return back to mode 3
1174 tstidx: outw %ax, %dx # OUT DX,AX and inidx
1175 inidx: outb %al, %dx # Read from indexed VGA register
1176 incw %dx # AL=index, DX=index reg port -> AL=data
1181 # Try to detect type of SVGA card and supply (usually approximate) video
1182 # mode table for it.
1184 #ifdef CONFIG_VIDEO_SVGA
1186 leaw svga_table, %si # Test all known SVGA adapters
1188 movw %ax, %bp # Default mode table
1192 lodsw # Pointer to test routine
1198 call *%ax # Call test routine
1205 movw %bp, %si # Found, copy the modes
1206 movb svga_prefix, %ah
1215 didsv: movw %si, card_name # Store pointer to card name
1218 # Table of all known SVGA cards. For each card, we store a pointer to
1219 # a table of video modes supported by the card and a pointer to a routine
1220 # used for testing of presence of the card. The video mode table is always
1221 # followed by the name of the card or the chipset.
1223 .word ati_md, ati_test
1224 .word oak_md, oak_test
1225 .word paradise_md, paradise_test
1226 .word realtek_md, realtek_test
1227 .word s3_md, s3_test
1228 .word chips_md, chips_test
1229 .word video7_md, video7_test
1230 .word cirrus5_md, cirrus5_test
1231 .word cirrus6_md, cirrus6_test
1232 .word cirrus1_md, cirrus1_test
1233 .word ahead_md, ahead_test
1234 .word everex_md, everex_test
1235 .word genoa_md, genoa_test
1236 .word trident_md, trident_test
1237 .word tseng_md, tseng_test
1240 # Test routines and mode tables:
1242 # S3 - The test algorithm was taken from the SuperProbe package
1243 # for XFree86 1.2.1. Report bugs to Christoph.Niemann@linux.org
1245 movw $0x0f35, %cx # we store some constants in cl/ch
1249 movb %al, %bh # store current CRT-register 0x38
1251 call outidx # disable writing to special regs
1252 movb %cl, %al # check whether we can write special reg 0x35
1254 movb %al, %bl # save the current value of CRT reg 0x35
1255 andb $0xf0, %al # clear bits 0-3
1257 movb %cl, %al # and write it to CRT reg 0x35
1259 call inidx # now read it back
1260 andb %ch, %al # clear the upper 4 bits
1261 jz s3_2 # the first test failed. But we have a
1263 movb %bl, %ah # second chance
1266 jmp s3_1 # do the other tests
1268 s3_2: movw %cx, %ax # load ah with 0xf and al with 0x35
1269 orb %bl, %ah # set the upper 4 bits of ah with the orig value
1270 call outidx # write ...
1271 call inidx # ... and reread
1272 andb %cl, %al # turn off the upper 4 bits
1274 movb %bl, %ah # restore old value in register 0x35
1278 cmpb %ch, %al # setting lower 4 bits was successful => bad
1279 je no_s3 # writing is allowed => this is not an S3
1281 s3_1: movw $0x4838, %ax # allow writing to special regs by putting
1282 call outidx # magic number into CRT-register 0x38
1283 movb %cl, %al # check whether we can write special reg 0x35
1292 jnz no_s3 # no, we can't write => no S3
1300 movb %bl, %ah # restore old value in register 0x35
1305 jne no_s31 # writing not possible => no S3
1307 call inidx # now get the S3 id ...
1318 no_s3: movb $0x35, %al # restore CRT register 0x35
1321 no_s31: xorw %bp, %bp # Detection failed
1322 s3rest: movb %bh, %ah
1323 movb $0x38, %al # restore old value of CRT register 0x38
1326 idS3: .byte 0x81, 0x82, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95
1327 .byte 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa8, 0xb0
1329 s3_md: .byte 0x54, 0x2b, 0x84
1330 .byte 0x55, 0x19, 0x84
1347 idati: .ascii "761295520"
1349 ati_md: .byte 0x23, 0x19, 0x84
1350 .byte 0x33, 0x2c, 0x84
1351 .byte 0x22, 0x1e, 0x64
1352 .byte 0x21, 0x19, 0x64
1353 .byte 0x58, 0x21, 0x50
1354 .byte 0x5b, 0x1e, 0x50
1376 .byte 0x22, 0x2c, 0x84
1377 .byte 0x23, 0x19, 0x84
1378 .byte 0x24, 0x1c, 0x84
1379 .byte 0x2f, 0x32, 0xa0
1380 .byte 0x32, 0x22, 0x50
1381 .byte 0x34, 0x42, 0x50
1406 .byte 0x60, 0x19, 0x84
1407 .byte 0x61, 0x32, 0x84
1409 .ascii "Chips & Technologies"
1450 nocirr: xorw %bp, %bp
1451 iscirr: movw $0x3d4, %dx
1460 .byte 0x1f, 0x19, 0x84
1461 .byte 0x20, 0x2c, 0x84
1462 .byte 0x22, 0x1e, 0x84
1463 .byte 0x31, 0x25, 0x64
1465 .ascii "Cirrus Logic 5X0"
1473 movb %al, %bl # BL=backup
1507 c5fail: xorw %bp, %bp
1508 c5done: movb $6, %al
1514 .byte 0x14, 0x19, 0x84
1515 .byte 0x54, 0x2b, 0x84
1517 .ascii "Cirrus Logic 54XX"
1520 # Cirrus Logic 64XX -- no known extra modes, but must be identified, because
1521 # it's misidentified by the Ahead test.
1526 movb %al, %bl # BL=backup
1538 call inidx # 4X, 5X, 7X and 8X are valid 64XX chip ID's.
1552 c2fail: xorw %bp, %bp
1553 c6done: movb $0x0a, %al
1560 .ascii "Cirrus Logic 64XX"
1578 evtrid: leaw trident_md, %bp
1581 noevrx: xorw %bp, %bp
1585 .byte 0x03, 0x22, 0x50
1586 .byte 0x04, 0x3c, 0x50
1587 .byte 0x07, 0x2b, 0x64
1588 .byte 0x08, 0x4b, 0x64
1589 .byte 0x0a, 0x19, 0x84
1590 .byte 0x0b, 0x2c, 0x84
1591 .byte 0x16, 0x1e, 0x50
1592 .byte 0x18, 0x1b, 0x64
1593 .byte 0x21, 0x40, 0xa0
1594 .byte 0x40, 0x1e, 0x84
1596 .ascii "Everex/Trident"
1601 leaw idgenoa, %si # Check Genoa 'clues'
1603 movb %es:(0x37), %al
1622 idgenoa: .byte 0x77, 0x00, 0x99, 0x66
1625 .byte 0x58, 0x20, 0x50
1626 .byte 0x5a, 0x2a, 0x64
1627 .byte 0x60, 0x19, 0x84
1628 .byte 0x61, 0x1d, 0x84
1629 .byte 0x62, 0x20, 0x84
1630 .byte 0x63, 0x2c, 0x84
1631 .byte 0x64, 0x3c, 0x84
1632 .byte 0x6b, 0x4f, 0x64
1633 .byte 0x72, 0x3c, 0x50
1634 .byte 0x74, 0x42, 0x50
1635 .byte 0x78, 0x4b, 0x64
1652 idoakvga: .ascii "OAK VGA "
1654 oak_md: .byte 0x4e, 0x3c, 0x50
1655 .byte 0x4f, 0x3c, 0x84
1656 .byte 0x50, 0x19, 0x84
1657 .byte 0x51, 0x2b, 0x84
1664 leaw idparadise, %si
1674 idparadise: .ascii "VGA="
1677 .byte 0x41, 0x22, 0x50
1678 .byte 0x47, 0x1c, 0x84
1679 .byte 0x55, 0x19, 0x84
1680 .byte 0x54, 0x2c, 0x84
1697 movb %al, %bl # Strange thing ... in the book this wasn't
1698 andb $0x02, %bl # necessary but it worked on my card which
1699 jz setb2 # is a trident. Without it the screen goes
1704 setb2: orb $0x02, %al
1705 clrb2: outb %al, %dx
1714 .byte 0x50, 0x1e, 0x50
1715 .byte 0x51, 0x2b, 0x50
1716 .byte 0x52, 0x3c, 0x50
1717 .byte 0x57, 0x19, 0x84
1718 .byte 0x58, 0x1e, 0x84
1719 .byte 0x59, 0x2b, 0x84
1720 .byte 0x5a, 0x3c, 0x84
1728 inb %dx, %al # Could things be this simple ! :-)
1739 isnot: xorw %bp, %bp
1743 .byte 0x26, 0x3c, 0x50
1744 .byte 0x2a, 0x28, 0x64
1745 .byte 0x23, 0x19, 0x84
1746 .byte 0x24, 0x1c, 0x84
1747 .byte 0x22, 0x2c, 0x84
1748 .byte 0x21, 0x3c, 0x84
1762 even7: movb $0x0c, %al
1787 movb $VIDEO_FIRST_V7>>8, svga_prefix # Use special mode switching
1791 .byte 0x40, 0x2b, 0x50
1792 .byte 0x43, 0x3c, 0x50
1793 .byte 0x44, 0x3c, 0x64
1794 .byte 0x41, 0x19, 0x84
1795 .byte 0x42, 0x2c, 0x84
1796 .byte 0x45, 0x1c, 0x84
1813 idrtvga: .ascii "REALTEK VGA"
1816 .byte 0x1a, 0x3c, 0x50
1817 .byte 0x1b, 0x19, 0x84
1818 .byte 0x1c, 0x1e, 0x84
1819 .byte 0x1d, 0x2b, 0x84
1820 .byte 0x1e, 0x3c, 0x84
1825 #endif /* CONFIG_VIDEO_SVGA */
1827 # User-defined local mode table (VGA only)
1828 #ifdef CONFIG_VIDEO_LOCAL
1830 leaw local_mode_table, %si
1841 # This is the table of local video modes which can be supplied manually
1842 # by the user. Each entry consists of mode ID (word) and dimensions
1843 # (byte for column count and another byte for row count). These modes
1844 # are placed before all SVGA and VESA modes and override them if table
1845 # compacting is enabled. The table must end with a zero word followed
1846 # by NUL-terminated video adapter name.
1848 .word 0x0100 # Example: 40x25
1853 #endif /* CONFIG_VIDEO_LOCAL */
1855 # Read a key and return the ASCII code in al, scan code in ah
1856 getkey: xorb %ah, %ah
1860 # Read a key with a timeout of 30 seconds.
1861 # The hardware clock is used to get the time.
1863 addb $30, %al # Wait 30 seconds
1870 again: movb $0x01, %ah
1872 jnz getkey # key pressed, so get it
1878 movb $0x20, %al # timeout, return `space'
1881 # Flush the keyboard buffer
1882 flush: movb $0x01, %ah
1892 # Print hexadecimal number.
1902 prthn: cmpb $0x0a, %al
1906 prth1: addb $0x30, %al
1909 # Print decimal number in al
1921 lt100: addb $0x30, %al
1923 skip10: movb %ah, %al
1931 pushw %es # just save all registers
1941 movl $0x13131313, %eax # memset block with 0x13
1948 movw $0x4f15, %ax # do VBE/DDC
1955 popw %di # restore all registers
1963 # VIDEO_SELECT-only variables
1964 mt_end: .word 0 # End of video mode table if built
1965 edit_buf: .space 6 # Line editor buffer
1966 card_name: .word 0 # Pointer to adapter name
1967 scanning: .byte 0 # Performing mode scan
1968 do_restore: .byte 0 # Screen contents altered during mode change
1969 svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
1970 graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
1971 dac_size: .byte 6 # DAC bit depth
1974 keymsg: .ascii "Press <RETURN> to see video modes available, "
1975 .ascii "<SPACE> to continue or wait 30 secs"
1978 listhdr: .byte 0x0d, 0x0a
1979 .ascii "Mode: COLSxROWS:"
1981 crlft: .byte 0x0d, 0x0a, 0
1983 prompt: .byte 0x0d, 0x0a
1984 .asciz "Enter mode number or `scan': "
1986 unknt: .asciz "Unknown mode ID. Try again."
1988 badmdt: .ascii "You passed an undefined mode number."
1991 vesaer: .ascii "Error: Scanning of VESA modes failed. Please "
1992 .ascii "report to <mj@ucw.cz>."
1995 old_name: .asciz "CGA/MDA/HGA"
1997 ega_name: .asciz "EGA"
1999 svga_name: .ascii " "
2001 vga_name: .asciz "VGA"
2003 vesa_name: .asciz "VESA"
2005 name_bann: .asciz "Video adapter: "
2006 #endif /* CONFIG_VIDEO_SELECT */
2009 adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA
2010 video_segment: .word 0xb800 # Video memory segment
2011 force_size: .word 0 # Use this size instead of the one in BIOS vars