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 /* Enable autodetection of SVGA adapters and modes. */
15 #undef CONFIG_VIDEO_SVGA
17 /* Enable autodetection of VESA modes */
18 #define CONFIG_VIDEO_VESA
20 /* Enable compacting of mode table */
21 #define CONFIG_VIDEO_COMPACT
23 /* Retain screen contents when switching modes */
24 #define CONFIG_VIDEO_RETAIN
26 /* Enable local mode list */
27 #undef CONFIG_VIDEO_LOCAL
29 /* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */
30 #undef CONFIG_VIDEO_400_HACK
32 /* Hack that lets you force specific BIOS mode ID and specific dimensions */
33 #undef CONFIG_VIDEO_GFX_HACK
34 #define VIDEO_GFX_BIOS_AX 0x4f02 /* 800x600 on ThinkPad */
35 #define VIDEO_GFX_BIOS_BX 0x0102
36 #define VIDEO_GFX_DUMMY_RESOLUTION 0x6425 /* 100x37 */
38 /* This code uses an extended set of video mode numbers. These include:
39 * Aliases for standard modes
43 * Video modes numbered by menu position -- NOT RECOMMENDED because of lack
44 * of compatibility when extending the table. These are between 0x00 and 0xff.
46 #define VIDEO_FIRST_MENU 0x0000
48 /* Standard BIOS video modes (BIOS number + 0x0100) */
49 #define VIDEO_FIRST_BIOS 0x0100
51 /* VESA BIOS video modes (VESA number + 0x0200) */
52 #define VIDEO_FIRST_VESA 0x0200
54 /* Video7 special modes (BIOS number + 0x0900) */
55 #define VIDEO_FIRST_V7 0x0900
57 /* Special video modes */
58 #define VIDEO_FIRST_SPECIAL 0x0f00
59 #define VIDEO_80x25 0x0f00
60 #define VIDEO_8POINT 0x0f01
61 #define VIDEO_80x43 0x0f02
62 #define VIDEO_80x28 0x0f03
63 #define VIDEO_CURRENT_MODE 0x0f04
64 #define VIDEO_80x30 0x0f05
65 #define VIDEO_80x34 0x0f06
66 #define VIDEO_80x60 0x0f07
67 #define VIDEO_GFX_HACK 0x0f08
68 #define VIDEO_LAST_SPECIAL 0x0f09
70 /* Video modes given by resolution */
71 #define VIDEO_FIRST_RESOLUTION 0x1000
73 /* The "recalculate timings" flag */
74 #define VIDEO_RECALC 0x8000
76 /* Positions of various video parameters passed to the kernel */
77 /* (see also include/linux/tty.h) */
78 #define PARAM_CURSOR_POS 0x00
79 #define PARAM_VIDEO_PAGE 0x04
80 #define PARAM_VIDEO_MODE 0x06
81 #define PARAM_VIDEO_COLS 0x07
82 #define PARAM_VIDEO_EGA_BX 0x0a
83 #define PARAM_VIDEO_LINES 0x0e
84 #define PARAM_HAVE_VGA 0x0f
85 #define PARAM_FONT_POINTS 0x10
87 #define PARAM_LFB_WIDTH 0x12
88 #define PARAM_LFB_HEIGHT 0x14
89 #define PARAM_LFB_DEPTH 0x16
90 #define PARAM_LFB_BASE 0x18
91 #define PARAM_LFB_SIZE 0x1c
92 #define PARAM_LFB_LINELENGTH 0x24
93 #define PARAM_LFB_COLORS 0x26
94 #define PARAM_VESAPM_SEG 0x2e
95 #define PARAM_VESAPM_OFF 0x30
96 #define PARAM_LFB_PAGES 0x32
97 #define PARAM_VESA_ATTRIB 0x34
98 #define PARAM_CAPABILITIES 0x36
100 /* Define DO_STORE according to CONFIG_VIDEO_RETAIN */
101 #ifdef CONFIG_VIDEO_RETAIN
102 #define DO_STORE call store_screen
105 #endif /* CONFIG_VIDEO_RETAIN */
107 # This is the main entry point called by setup.S
108 # %ds *must* be pointing to the bootsector
109 video: pushw %ds # We use different segments
110 pushw %ds # FS contains original DS
112 pushw %cs # DS is equal to CS
114 pushw %cs # ES is equal to CS
117 movw %ax, %gs # GS is zero
119 call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA)
120 #ifdef CONFIG_VIDEO_SELECT
121 movw %fs:(0x01fa), %ax # User selected video mode
122 cmpw $ASK_VGA, %ax # Bring up the menu
125 call mode_set # Set the mode
128 leaw badmdt, %si # Invalid mode ID
132 #ifdef CONFIG_VIDEO_RETAIN
133 call restore_screen # Restore screen contents
134 #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)
235 # store mode capabilities
237 movl %eax, %fs:(PARAM_CAPABILITIES)
239 # switching the DAC to 8-bit is for <= 8 bpp only
240 movw %fs:(PARAM_LFB_DEPTH), %ax
244 # get DAC switching capability
250 # attempt to switch DAC to 8-bit
256 movb %bh, dac_size # store actual DAC size
259 # set color size to DAC size
261 movb %al, %fs:(PARAM_LFB_COLORS+0)
262 movb %al, %fs:(PARAM_LFB_COLORS+2)
263 movb %al, %fs:(PARAM_LFB_COLORS+4)
264 movb %al, %fs:(PARAM_LFB_COLORS+6)
266 # set color offsets to 0
267 movb $0, %fs:(PARAM_LFB_COLORS+1)
268 movb $0, %fs:(PARAM_LFB_COLORS+3)
269 movb $0, %fs:(PARAM_LFB_COLORS+5)
270 movb $0, %fs:(PARAM_LFB_COLORS+7)
273 # get protected mode interface informations
281 movw %es, %fs:(PARAM_VESAPM_SEG)
282 movw %di, %fs:(PARAM_VESAPM_OFF)
285 # The video mode menu
287 leaw keymsg, %si # "Return/Space/Timeout" message
292 cmpb $0x0d, %al # ENTER ?
293 je listm # yes - manual mode selection
295 cmpb $0x20, %al # SPACE ?
296 je defmd1 # no - repeat
301 defmd1: ret # No mode chosen? Default 80x25
303 listm: call mode_table # List mode table
304 listm0: leaw name_bann, %si # Print adapter name
325 leaw listhdr, %si # Table header
327 movb $0x30, %dl # DL holds mode number
329 lm1: cmpw $ASK_VGA, (%si) # End?
332 movb %dl, %al # Menu selection number
340 movb $0x78, %al # the letter 'x'
343 call prtdec # Columns
344 movb $0x0d, %al # New line
348 incb %dl # Next character
355 lm2: leaw prompt, %si # Mode prompt
357 leaw edit_buf, %di # Editor buffer
359 cmpb $0x0d, %al # Enter?
362 cmpb $0x08, %al # Backspace?
365 cmpb $0x20, %al # Printable?
368 cmpw $edit_buf+4, %di # Enough space?
375 lmbs: cmpw $edit_buf, %di # Backspace
386 lment: movb $0, (%di)
390 cmpb $0, (%si) # Empty string = default mode
393 cmpb $0, 1(%si) # One character = menu selection
396 cmpw $0x6373, (%si) # "scan" => mode scanning
402 lmhx: xorw %bx, %bx # Else => mode ID in hex
425 lmuse1: movw %bx, %ax
428 mnusel: lodsb # Menu selection
439 subb $0x61-0x30-10, %al
446 lmbad: leaw unknt, %si
449 lmscan: cmpb $0, adapter # Scanning only on EGA/VGA
452 movw $0, mt_end # Scanning of modes is
453 movb $1, scanning # done as new autodetection.
458 # Additional parts of mode_set... (relative jumps, you know)
459 setv7: # Video7 extended modes
461 subb $VIDEO_FIRST_V7>>8, %bh
467 _setrec: jmp setrec # Ugly...
468 _set_80x25: jmp set_80x25
470 # Aliases for backward compatibility.
472 movw $VIDEO_80x25, %ax
476 movb $VIDEO_8POINT-VIDEO_FIRST_SPECIAL, %al
478 jnz setbad # Fall-through!
480 # Setting of user mode (AX=mode ID) => CF=success
482 movw %ax, %fs:(0x01fa) # Store mode for use in acpi_wakeup.S
487 testb $VIDEO_RECALC>>8, %ah
490 cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
493 cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
496 cmpb $VIDEO_FIRST_V7>>8, %ah
499 cmpb $VIDEO_FIRST_VESA>>8, %ah
509 movb $0, do_restore # The screen needn't be restored
514 subb $VIDEO_FIRST_VESA>>8, %bh
515 movw $0x4f02, %ax # VESA BIOS mode set call
517 cmpw $0x004f, %ax # AL=4f if implemented
518 jnz setbad # AH=0 if OK
525 int $0x10 # Standard BIOS mode set call
527 movb $0x0f, %ah # Check if really set
536 setspc: xorb %bh, %bh # Set special mode
537 cmpb $VIDEO_LAST_SPECIAL-VIDEO_FIRST_SPECIAL, %bl
544 orb %al, %al # 80x25 is an exception
547 pushw %bx # Set mode chosen from menu
548 call mode_table # Build the mode table
555 movw (%si), %ax # Fetch mode ID
558 setres: pushw %bx # Set mode chosen by resolution
563 cmpw $ASK_VGA, %ax # End of the list?
570 movw -4(%si), %ax # Fetch mode ID
574 #ifdef CONFIG_FIRMWARE_EDID
575 leaw modelist+1024, %di
582 movw %ax, vbe_version
584 leaw modelist+1024, %di
585 subb $VIDEO_FIRST_VESA>>8, %bh
586 movw %bx, %cx # Get mode information structure
589 addb $VIDEO_FIRST_VESA>>8, %bh
593 movb (%di), %al # Check capabilities.
596 jz setvesa # This is a text mode
598 movb (%di), %al # Check capabilities.
601 jnz _setbad # Doh! No linear frame buffer.
603 subb $VIDEO_FIRST_VESA>>8, %bh
604 orw $0x4000, %bx # Use linear frame buffer
605 movw $0x4f02, %ax # VESA BIOS mode set call
607 cmpw $0x004f, %ax # AL=4f if implemented
608 jnz _setbad # AH=0 if OK
610 movb $1, graphic_mode # flag graphic mode
611 movb $0, do_restore # no screen restore
615 _setbad: jmp setbad # Ugly...
617 # Recalculate vertical display end registers -- this fixes various
618 # inconsistencies of extended modes on many adapters. Called when
619 # the VIDEO_RECALC flag is set in the mode ID.
621 setrec: subb $VIDEO_RECALC>>8, %ah # Set the base mode
625 movw %gs:(0x485), %ax # Font size in pixels
626 movb %gs:(0x484), %bl # Number of rows
628 mulb %bl # Number of visible
629 decw %ax # scan lines - 1
632 movb $0x12, %al # Lower 8 bits
635 movb $0x07, %al # Bits 8 and 9 in the overflow register
645 rct2: movb $0x07, %al
650 # Table of routines for setting of the special modes.
662 # Set the 80x25 mode. If already set, do nothing.
664 movw $0x5019, force_size # Override possibly broken BIOS
666 #ifdef CONFIG_VIDEO_400_HACK
667 movw $0x1202, %ax # Force 400 scan lines
671 movb $0x0f, %ah # Get current mode ID
673 cmpw $0x5007, %ax # Mode 7 (80x25 mono) is the only one available
674 jz st80 # on CGA/MDA/HGA and is also available on EGAM
676 cmpw $0x5003, %ax # Unknown mode, force 80x25 color
679 st80: cmpb $0, adapter # CGA/MDA/HGA => mode 3/7 is always 80x25
682 movb %gs:(0x0484), %al # This is EGA+ -- beware of 80x50 etc.
683 orb %al, %al # Some buggy BIOS'es set 0 rows
686 cmpb $24, %al # It's hopefully correct
688 #endif /* CONFIG_VIDEO_400_HACK */
690 movw $0x0003, %ax # Forced set
695 # Set the 80x50/80x43 8-pixel mode. Simple BIOS calls.
698 call use_80x25 # The base is 80x25
700 movw $0x1112, %ax # Use 8x8 font
703 movw $0x1200, %ax # Use alternate print screen
706 movw $0x1201, %ax # Turn off cursor emulation
709 movb $0x01, %ah # Define cursor scan lines 6-7
716 # Set the 80x28 mode. This mode works on all VGA's, because it's a standard
717 # 80x25 mode with 14-point fonts instead of 16-point.
720 call use_80x25 # The base is 80x25
721 set14: movw $0x1111, %ax # Use 9x14 font
724 movb $0x01, %ah # Define cursor scan lines 11-12
730 # Set the 80x43 mode. This mode is works on all VGA's.
731 # It's a 350-scanline mode with 8-pixel font.
734 movw $0x1201, %ax # Set 350 scans
737 movw $0x0003, %ax # Reset video mode
739 jmp set_8pt # Use 8-pixel font
741 # Set the 80x30 mode (all VGA's). 480 scanlines, 16-pixel font.
743 call use_80x25 # Start with real 80x25
745 movw $0x3cc, %dx # Get CRTC port
748 rorb %al # Mono or color?
752 set48a: movw $0x0c11, %ax # Vertical sync end (also unlocks CR0-7)
754 movw $0x0b06, %ax # Vertical total
756 movw $0x3e07, %ax # (Vertical) overflow
758 movw $0xea10, %ax # Vertical sync start
760 movw $0xdf12, %ax # Vertical display end
762 movw $0xe715, %ax # Vertical blank start
764 movw $0x0416, %ax # Vertical blank end
767 movb $0xcc, %dl # Misc output register (read)
769 movb $0xc2, %dl # (write)
770 andb $0x0d, %al # Preserve clock select bits and color bit
771 orb $0xe2, %al # Set correct sync polarity
774 movw $0x501e, force_size
778 # Set the 80x34 mode (all VGA's). 480 scans, 14-pixel font.
780 call set_80x30 # Set 480 scans
781 call set14 # And 14-pt font
782 movw $0xdb12, %ax # VGA vertical display end
783 movw $0x5022, force_size
788 # Set the 80x60 mode (all VGA's). 480 scans, 8-pixel font.
790 call set_80x30 # Set 480 scans
791 call set_8pt # And 8-pt font
792 movw $0xdf12, %ax # VGA vertical display end
793 movw $0x503c, force_size
796 # Special hack for ThinkPad graphics
798 #ifdef CONFIG_VIDEO_GFX_HACK
799 movw $VIDEO_GFX_BIOS_AX, %ax
800 movw $VIDEO_GFX_BIOS_BX, %bx
802 movw $VIDEO_GFX_DUMMY_RESOLUTION, force_size
807 #ifdef CONFIG_VIDEO_RETAIN
809 # Store screen contents to temporary buffer.
811 cmpb $0, do_restore # Already stored?
814 testb $CAN_USE_HEAP, loadflags # Have we space for storing?
819 pushw force_size # Don't force specific size
821 call mode_params # Obtain params of current mode
823 movb %fs:(PARAM_VIDEO_LINES), %ah
824 movb %fs:(PARAM_VIDEO_COLS), %al
825 movw %ax, %bx # BX=dimensions
827 movw %ax, %cx # CX=number of characters
828 addw %ax, %ax # Calculate image size
829 addw $modelist+1024+4, %ax
830 cmpw heap_end_ptr, %ax
831 jnc sts1 # Unfortunately, out of memory
833 movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params
834 leaw modelist+1024, %di
838 pushw %ds # Store the screen
839 movw video_segment, %ds
844 incb do_restore # Screen will be restored later
849 # Restore screen contents from temporary buffer.
851 cmpb $0, do_restore # Has the screen been stored?
854 call mode_params # Get parameters of current mode
855 movb %fs:(PARAM_VIDEO_LINES), %cl
856 movb %fs:(PARAM_VIDEO_COLS), %ch
857 leaw modelist+1024, %si # Screen buffer
858 lodsw # Set cursor position
870 res3: movb $0x02, %ah
874 movb %ah, %dl # DL=number of lines
875 movb $0, %ah # BX=phys. length of orig. line
877 cmpb %cl, %dl # Too many?
888 res4: cmpb %ch, %al # Too wide?
891 movb %ch, %al # AX=width of src. line
894 movw %cx, %bp # BP=width of dest. line
896 movw video_segment, %es
897 xorw %di, %di # Move the data
898 addw %bx, %bx # Convert BX and BP to _bytes_
914 #endif /* CONFIG_VIDEO_RETAIN */
916 # Write to indexed VGA register (AL=index, AH=data, DX=index reg. port)
917 outidx: outb %al, %dx
926 # Build the table of video modes (stored after the setup.S code at the
927 # `modelist' label. Each video mode record looks like:
928 # .word MODE-ID (our special mode ID (see above))
929 # .byte rows (number of rows)
930 # .byte columns (number of columns)
931 # Returns address of the end of the table in DI, the end is marked
934 movw mt_end, %di # Already filled?
938 leaw modelist, %di # Store standard modes:
939 movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL)
941 movb adapter, %al # CGA/MDA/HGA -- no more modes
948 movl $VIDEO_8POINT + 0x502b0000, %eax # The 80x43 EGA mode
954 mtabv: leaw vga_modes, %si # All modes for std VGA
955 movw $vga_modes_end-vga_modes, %cx
956 rep # I'm unable to use movsw as I don't know how to store a half
957 movsb # of the expression above to cx without using explicit shr.
959 cmpb $0, scanning # Mode scan requested?
965 #ifdef CONFIG_VIDEO_LOCAL
967 #endif /* CONFIG_VIDEO_LOCAL */
969 #ifdef CONFIG_VIDEO_VESA
970 call vesa_modes # Detect VESA VGA modes
971 #endif /* CONFIG_VIDEO_VESA */
973 #ifdef CONFIG_VIDEO_SVGA
974 cmpb $0, scanning # Bypass when scanning
977 call svga_modes # Detect SVGA cards & modes
979 #endif /* CONFIG_VIDEO_SVGA */
983 #ifdef CONFIG_VIDEO_COMPACT
987 cmt1: cmpw %dx, %si # Scan all modes
990 leaw modelist, %bx # Find in previous entries
995 cmpw 2(%bx), %cx # Found => don't copy this entry
1001 cmt4: movsl # Copy entry
1004 cmt5: addw $4, %si # Skip entry
1008 #endif /* CONFIG_VIDEO_COMPACT */
1010 movw $ASK_VGA, (%di) # End marker
1012 mtab1: leaw modelist, %si # SI=mode list, DI=list end
1015 # Modes usable on all standard VGAs
1018 .word 0x5032 # 80x50
1020 .word 0x502b # 80x43
1022 .word 0x501c # 80x28
1024 .word 0x501e # 80x30
1026 .word 0x5022 # 80x34
1028 .word 0x503c # 80x60
1029 #ifdef CONFIG_VIDEO_GFX_HACK
1030 .word VIDEO_GFX_HACK
1031 .word VIDEO_GFX_DUMMY_RESOLUTION
1035 # Detect VESA modes.
1037 #ifdef CONFIG_VIDEO_VESA
1039 cmpb $2, adapter # VGA only
1042 movw %di, %bp # BP=original mode table end
1043 addw $0x200, %di # Buffer space
1044 movw $0x4f00, %ax # VESA Get card info call
1047 cmpw $0x004f, %ax # Successful?
1050 cmpw $0x4556, 0x200(%di)
1053 cmpw $0x4153, 0x202(%di)
1056 movw $vesa_name, card_name # Set name to "VESA VGA"
1058 lgsw 0x20e(%di), %si # GS:SI=mode list
1059 movw $128, %cx # Iteration limit
1061 # gas version 2.9.1, using BFD version 2.9.1.0.23 buggers the next inst.
1062 # XXX: lodsw %gs:(%si), %ax # Get next mode in the list
1064 cmpw $0xffff, %ax # End of the table?
1067 cmpw $0x0080, %ax # Check validity of mode ID
1070 orb %ah, %ah # Valid IDs: 0x0000-0x007f/0x0100-0x07ff
1071 jz vesan # Certain BIOSes report 0x80-0xff!
1077 movw %ax, %cx # Get mode information structure
1080 movw %cx, %bx # BX=mode number
1081 addb $VIDEO_FIRST_VESA>>8, %bh
1084 jnz vesan # Don't report errors (buggy BIOSES)
1086 movb (%di), %al # Check capabilities. We require
1087 andb $0x19, %al # a color text mode.
1091 cmpw $0xb800, 8(%di) # Standard video memory address required
1094 testb $2, (%di) # Mode characteristics supplied?
1095 movw %bx, (%di) # Store mode number
1099 movw 0x12(%di), %bx # Width
1104 movw 0x14(%di), %ax # Height
1110 cmpw $8193, %ax # Small enough for Linux console driver?
1115 vesa3: subw $0x8108, %bx # This mode has no detailed info specified,
1116 jc vesan # so it must be a standard VESA mode.
1121 movw vesa_text_mode_table(%bx), %ax
1123 vesaok: addw $4, %di # The mode is valid. Store it.
1124 vesan: loop vesa1 # Next mode. Limit exceeded => error
1125 vesae: leaw vesaer, %si
1127 movw %bp, %di # Discard already found modes.
1131 # Dimensions of standard VESA text modes
1132 vesa_text_mode_table:
1134 .byte 25, 132 # 0109
1135 .byte 43, 132 # 010A
1136 .byte 50, 132 # 010B
1137 .byte 60, 132 # 010C
1138 #endif /* CONFIG_VIDEO_VESA */
1140 # Scan for video modes. A bit dirty, but should work.
1142 movw $0x0100, %cx # Start with mode 0
1143 scm1: movb $0, %ah # Test the mode
1149 jnz scm2 # Mode not set
1151 movw $0x3c0, %dx # Test if it's a text mode
1152 movb $0x10, %al # Mode bits
1157 movb $0xce, %dl # Another set of mode bits
1163 movb $0xd4, %dl # Cursor location
1169 movw %cx, %ax # Ok, store the mode
1171 movb %gs:(0x484), %al # Number of rows
1174 movw %gs:(0x44a), %ax # Number of columns
1179 movw $0x0003, %ax # Return back to mode 3
1183 tstidx: outw %ax, %dx # OUT DX,AX and inidx
1184 inidx: outb %al, %dx # Read from indexed VGA register
1185 incw %dx # AL=index, DX=index reg port -> AL=data
1190 # Try to detect type of SVGA card and supply (usually approximate) video
1191 # mode table for it.
1193 #ifdef CONFIG_VIDEO_SVGA
1195 leaw svga_table, %si # Test all known SVGA adapters
1197 movw %ax, %bp # Default mode table
1201 lodsw # Pointer to test routine
1207 call *%ax # Call test routine
1214 movw %bp, %si # Found, copy the modes
1215 movb svga_prefix, %ah
1224 didsv: movw %si, card_name # Store pointer to card name
1227 # Table of all known SVGA cards. For each card, we store a pointer to
1228 # a table of video modes supported by the card and a pointer to a routine
1229 # used for testing of presence of the card. The video mode table is always
1230 # followed by the name of the card or the chipset.
1232 .word ati_md, ati_test
1233 .word oak_md, oak_test
1234 .word paradise_md, paradise_test
1235 .word realtek_md, realtek_test
1236 .word s3_md, s3_test
1237 .word chips_md, chips_test
1238 .word video7_md, video7_test
1239 .word cirrus5_md, cirrus5_test
1240 .word cirrus6_md, cirrus6_test
1241 .word cirrus1_md, cirrus1_test
1242 .word ahead_md, ahead_test
1243 .word everex_md, everex_test
1244 .word genoa_md, genoa_test
1245 .word trident_md, trident_test
1246 .word tseng_md, tseng_test
1249 # Test routines and mode tables:
1251 # S3 - The test algorithm was taken from the SuperProbe package
1252 # for XFree86 1.2.1. Report bugs to Christoph.Niemann@linux.org
1254 movw $0x0f35, %cx # we store some constants in cl/ch
1258 movb %al, %bh # store current CRT-register 0x38
1260 call outidx # disable writing to special regs
1261 movb %cl, %al # check whether we can write special reg 0x35
1263 movb %al, %bl # save the current value of CRT reg 0x35
1264 andb $0xf0, %al # clear bits 0-3
1266 movb %cl, %al # and write it to CRT reg 0x35
1268 call inidx # now read it back
1269 andb %ch, %al # clear the upper 4 bits
1270 jz s3_2 # the first test failed. But we have a
1272 movb %bl, %ah # second chance
1275 jmp s3_1 # do the other tests
1277 s3_2: movw %cx, %ax # load ah with 0xf and al with 0x35
1278 orb %bl, %ah # set the upper 4 bits of ah with the orig value
1279 call outidx # write ...
1280 call inidx # ... and reread
1281 andb %cl, %al # turn off the upper 4 bits
1283 movb %bl, %ah # restore old value in register 0x35
1287 cmpb %ch, %al # setting lower 4 bits was successful => bad
1288 je no_s3 # writing is allowed => this is not an S3
1290 s3_1: movw $0x4838, %ax # allow writing to special regs by putting
1291 call outidx # magic number into CRT-register 0x38
1292 movb %cl, %al # check whether we can write special reg 0x35
1301 jnz no_s3 # no, we can't write => no S3
1309 movb %bl, %ah # restore old value in register 0x35
1314 jne no_s31 # writing not possible => no S3
1316 call inidx # now get the S3 id ...
1327 no_s3: movb $0x35, %al # restore CRT register 0x35
1330 no_s31: xorw %bp, %bp # Detection failed
1331 s3rest: movb %bh, %ah
1332 movb $0x38, %al # restore old value of CRT register 0x38
1335 idS3: .byte 0x81, 0x82, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95
1336 .byte 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa8, 0xb0
1338 s3_md: .byte 0x54, 0x2b, 0x84
1339 .byte 0x55, 0x19, 0x84
1356 idati: .ascii "761295520"
1358 ati_md: .byte 0x23, 0x19, 0x84
1359 .byte 0x33, 0x2c, 0x84
1360 .byte 0x22, 0x1e, 0x64
1361 .byte 0x21, 0x19, 0x64
1362 .byte 0x58, 0x21, 0x50
1363 .byte 0x5b, 0x1e, 0x50
1385 .byte 0x22, 0x2c, 0x84
1386 .byte 0x23, 0x19, 0x84
1387 .byte 0x24, 0x1c, 0x84
1388 .byte 0x2f, 0x32, 0xa0
1389 .byte 0x32, 0x22, 0x50
1390 .byte 0x34, 0x42, 0x50
1415 .byte 0x60, 0x19, 0x84
1416 .byte 0x61, 0x32, 0x84
1418 .ascii "Chips & Technologies"
1459 nocirr: xorw %bp, %bp
1460 iscirr: movw $0x3d4, %dx
1469 .byte 0x1f, 0x19, 0x84
1470 .byte 0x20, 0x2c, 0x84
1471 .byte 0x22, 0x1e, 0x84
1472 .byte 0x31, 0x25, 0x64
1474 .ascii "Cirrus Logic 5X0"
1482 movb %al, %bl # BL=backup
1516 c5fail: xorw %bp, %bp
1517 c5done: movb $6, %al
1523 .byte 0x14, 0x19, 0x84
1524 .byte 0x54, 0x2b, 0x84
1526 .ascii "Cirrus Logic 54XX"
1529 # Cirrus Logic 64XX -- no known extra modes, but must be identified, because
1530 # it's misidentified by the Ahead test.
1535 movb %al, %bl # BL=backup
1547 call inidx # 4X, 5X, 7X and 8X are valid 64XX chip ID's.
1561 c2fail: xorw %bp, %bp
1562 c6done: movb $0x0a, %al
1569 .ascii "Cirrus Logic 64XX"
1587 evtrid: leaw trident_md, %bp
1590 noevrx: xorw %bp, %bp
1594 .byte 0x03, 0x22, 0x50
1595 .byte 0x04, 0x3c, 0x50
1596 .byte 0x07, 0x2b, 0x64
1597 .byte 0x08, 0x4b, 0x64
1598 .byte 0x0a, 0x19, 0x84
1599 .byte 0x0b, 0x2c, 0x84
1600 .byte 0x16, 0x1e, 0x50
1601 .byte 0x18, 0x1b, 0x64
1602 .byte 0x21, 0x40, 0xa0
1603 .byte 0x40, 0x1e, 0x84
1605 .ascii "Everex/Trident"
1610 leaw idgenoa, %si # Check Genoa 'clues'
1612 movb %es:(0x37), %al
1631 idgenoa: .byte 0x77, 0x00, 0x99, 0x66
1634 .byte 0x58, 0x20, 0x50
1635 .byte 0x5a, 0x2a, 0x64
1636 .byte 0x60, 0x19, 0x84
1637 .byte 0x61, 0x1d, 0x84
1638 .byte 0x62, 0x20, 0x84
1639 .byte 0x63, 0x2c, 0x84
1640 .byte 0x64, 0x3c, 0x84
1641 .byte 0x6b, 0x4f, 0x64
1642 .byte 0x72, 0x3c, 0x50
1643 .byte 0x74, 0x42, 0x50
1644 .byte 0x78, 0x4b, 0x64
1661 idoakvga: .ascii "OAK VGA "
1663 oak_md: .byte 0x4e, 0x3c, 0x50
1664 .byte 0x4f, 0x3c, 0x84
1665 .byte 0x50, 0x19, 0x84
1666 .byte 0x51, 0x2b, 0x84
1673 leaw idparadise, %si
1683 idparadise: .ascii "VGA="
1686 .byte 0x41, 0x22, 0x50
1687 .byte 0x47, 0x1c, 0x84
1688 .byte 0x55, 0x19, 0x84
1689 .byte 0x54, 0x2c, 0x84
1706 movb %al, %bl # Strange thing ... in the book this wasn't
1707 andb $0x02, %bl # necessary but it worked on my card which
1708 jz setb2 # is a trident. Without it the screen goes
1713 setb2: orb $0x02, %al
1714 clrb2: outb %al, %dx
1723 .byte 0x50, 0x1e, 0x50
1724 .byte 0x51, 0x2b, 0x50
1725 .byte 0x52, 0x3c, 0x50
1726 .byte 0x57, 0x19, 0x84
1727 .byte 0x58, 0x1e, 0x84
1728 .byte 0x59, 0x2b, 0x84
1729 .byte 0x5a, 0x3c, 0x84
1737 inb %dx, %al # Could things be this simple ! :-)
1748 isnot: xorw %bp, %bp
1752 .byte 0x26, 0x3c, 0x50
1753 .byte 0x2a, 0x28, 0x64
1754 .byte 0x23, 0x19, 0x84
1755 .byte 0x24, 0x1c, 0x84
1756 .byte 0x22, 0x2c, 0x84
1757 .byte 0x21, 0x3c, 0x84
1771 even7: movb $0x0c, %al
1796 movb $VIDEO_FIRST_V7>>8, svga_prefix # Use special mode switching
1800 .byte 0x40, 0x2b, 0x50
1801 .byte 0x43, 0x3c, 0x50
1802 .byte 0x44, 0x3c, 0x64
1803 .byte 0x41, 0x19, 0x84
1804 .byte 0x42, 0x2c, 0x84
1805 .byte 0x45, 0x1c, 0x84
1822 idrtvga: .ascii "REALTEK VGA"
1825 .byte 0x1a, 0x3c, 0x50
1826 .byte 0x1b, 0x19, 0x84
1827 .byte 0x1c, 0x1e, 0x84
1828 .byte 0x1d, 0x2b, 0x84
1829 .byte 0x1e, 0x3c, 0x84
1834 #endif /* CONFIG_VIDEO_SVGA */
1836 # User-defined local mode table (VGA only)
1837 #ifdef CONFIG_VIDEO_LOCAL
1839 leaw local_mode_table, %si
1850 # This is the table of local video modes which can be supplied manually
1851 # by the user. Each entry consists of mode ID (word) and dimensions
1852 # (byte for column count and another byte for row count). These modes
1853 # are placed before all SVGA and VESA modes and override them if table
1854 # compacting is enabled. The table must end with a zero word followed
1855 # by NUL-terminated video adapter name.
1857 .word 0x0100 # Example: 40x25
1862 #endif /* CONFIG_VIDEO_LOCAL */
1864 # Read a key and return the ASCII code in al, scan code in ah
1865 getkey: xorb %ah, %ah
1869 # Read a key with a timeout of 30 seconds.
1870 # The hardware clock is used to get the time.
1872 addb $30, %al # Wait 30 seconds
1879 again: movb $0x01, %ah
1881 jnz getkey # key pressed, so get it
1887 movb $0x20, %al # timeout, return `space'
1890 # Flush the keyboard buffer
1891 flush: movb $0x01, %ah
1901 # Print hexadecimal number.
1911 prthn: cmpb $0x0a, %al
1915 prth1: addb $0x30, %al
1918 # Print decimal number in al
1930 lt100: addb $0x30, %al
1932 skip10: movb %ah, %al
1940 #ifdef CONFIG_FIRMWARE_EDID
1941 pushw %es # just save all registers
1951 movl $0x13131313, %eax # memset block with 0x13
1958 cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0
1962 xorw %di, %di # Report Capability
1964 popw %es # ES:DI must be 0:0
1969 popw %es # restore ES
1971 cmpb $0x00, %ah # call successful
1974 cmpb $0x4f, %al # function supported
1977 movw $0x4f15, %ax # do VBE/DDC
1985 popw %di # restore all registers
1994 # VIDEO_SELECT-only variables
1995 mt_end: .word 0 # End of video mode table if built
1996 edit_buf: .space 6 # Line editor buffer
1997 card_name: .word 0 # Pointer to adapter name
1998 scanning: .byte 0 # Performing mode scan
1999 do_restore: .byte 0 # Screen contents altered during mode change
2000 svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
2001 graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
2002 dac_size: .byte 6 # DAC bit depth
2003 vbe_version: .word 0 # VBE bios version
2006 keymsg: .ascii "Press <RETURN> to see video modes available, "
2007 .ascii "<SPACE> to continue or wait 30 secs"
2010 listhdr: .byte 0x0d, 0x0a
2011 .ascii "Mode: COLSxROWS:"
2013 crlft: .byte 0x0d, 0x0a, 0
2015 prompt: .byte 0x0d, 0x0a
2016 .asciz "Enter mode number or `scan': "
2018 unknt: .asciz "Unknown mode ID. Try again."
2020 badmdt: .ascii "You passed an undefined mode number."
2023 vesaer: .ascii "Error: Scanning of VESA modes failed. Please "
2024 .ascii "report to <mj@ucw.cz>."
2027 old_name: .asciz "CGA/MDA/HGA"
2029 ega_name: .asciz "EGA"
2031 svga_name: .ascii " "
2033 vga_name: .asciz "VGA"
2035 vesa_name: .asciz "VESA"
2037 name_bann: .asciz "Video adapter: "
2038 #endif /* CONFIG_VIDEO_SELECT */
2041 adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA
2042 video_segment: .word 0xb800 # Video memory segment
2043 force_size: .word 0 # Use this size instead of the one in BIOS vars