/* video.S * * Display adapter & video mode setup, version 2.13 (14-May-99) * * Copyright (C) 1995 -- 1998 Martin Mares * Based on the original setup.S code (C) Linus Torvalds and Mats Anderson * * Rewritten to use GNU 'as' by Chris Noe May 1999 * * For further information, look at Documentation/svga.txt. * */ #include /* for CONFIG_VIDEO_* */ /* Enable autodetection of SVGA adapters and modes. */ #undef CONFIG_VIDEO_SVGA /* Enable autodetection of VESA modes */ #define CONFIG_VIDEO_VESA /* Enable compacting of mode table */ #define CONFIG_VIDEO_COMPACT /* Retain screen contents when switching modes */ #define CONFIG_VIDEO_RETAIN /* Enable local mode list */ #undef CONFIG_VIDEO_LOCAL /* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */ #undef CONFIG_VIDEO_400_HACK /* Hack that lets you force specific BIOS mode ID and specific dimensions */ #undef CONFIG_VIDEO_GFX_HACK #define VIDEO_GFX_BIOS_AX 0x4f02 /* 800x600 on ThinkPad */ #define VIDEO_GFX_BIOS_BX 0x0102 #define VIDEO_GFX_DUMMY_RESOLUTION 0x6425 /* 100x37 */ /* This code uses an extended set of video mode numbers. These include: * Aliases for standard modes * NORMAL_VGA (-1) * EXTENDED_VGA (-2) * ASK_VGA (-3) * Video modes numbered by menu position -- NOT RECOMMENDED because of lack * of compatibility when extending the table. These are between 0x00 and 0xff. */ #define VIDEO_FIRST_MENU 0x0000 /* Standard BIOS video modes (BIOS number + 0x0100) */ #define VIDEO_FIRST_BIOS 0x0100 /* VESA BIOS video modes (VESA number + 0x0200) */ #define VIDEO_FIRST_VESA 0x0200 /* Video7 special modes (BIOS number + 0x0900) */ #define VIDEO_FIRST_V7 0x0900 /* Special video modes */ #define VIDEO_FIRST_SPECIAL 0x0f00 #define VIDEO_80x25 0x0f00 #define VIDEO_8POINT 0x0f01 #define VIDEO_80x43 0x0f02 #define VIDEO_80x28 0x0f03 #define VIDEO_CURRENT_MODE 0x0f04 #define VIDEO_80x30 0x0f05 #define VIDEO_80x34 0x0f06 #define VIDEO_80x60 0x0f07 #define VIDEO_LAST_SPECIAL 0x0f09 /* Video modes given by resolution */ #define VIDEO_FIRST_RESOLUTION 0x1000 /* The "recalculate timings" flag */ #define VIDEO_RECALC 0x8000 /* Positions of various video parameters passed to the kernel */ /* (see also include/linux/tty.h) */ #define PARAM_CURSOR_POS 0x00 #define PARAM_VIDEO_PAGE 0x04 #define PARAM_VIDEO_MODE 0x06 #define PARAM_VIDEO_COLS 0x07 #define PARAM_VIDEO_EGA_BX 0x0a #define PARAM_VIDEO_LINES 0x0e #define PARAM_HAVE_VGA 0x0f #define PARAM_FONT_POINTS 0x10 #define PARAM_LFB_WIDTH 0x12 #define PARAM_LFB_HEIGHT 0x14 #define PARAM_LFB_DEPTH 0x16 #define PARAM_LFB_BASE 0x18 #define PARAM_LFB_SIZE 0x1c #define PARAM_LFB_LINELENGTH 0x24 #define PARAM_LFB_COLORS 0x26 #define PARAM_VESAPM_SEG 0x2e #define PARAM_VESAPM_OFF 0x30 #define PARAM_LFB_PAGES 0x32 /* Define DO_STORE according to CONFIG_VIDEO_RETAIN */ #ifdef CONFIG_VIDEO_RETAIN #define DO_STORE call store_screen #else #define DO_STORE #endif /* CONFIG_VIDEO_RETAIN */ # This is the main entry point called by setup.S # %ds *must* be pointing to the bootsector video: pushw %ds # We use different segments pushw %ds # FS contains original DS popw %fs pushw %cs # DS is equal to CS popw %ds pushw %cs # ES is equal to CS popw %es xorw %ax, %ax movw %ax, %gs # GS is zero cld call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA) #ifdef CONFIG_VIDEO_SELECT movw %fs:(0x01fa), %ax # User selected video mode cmpw $ASK_VGA, %ax # Bring up the menu jz vid2 call mode_set # Set the mode jc vid1 leaw badmdt, %si # Invalid mode ID call prtstr vid2: call mode_menu vid1: #ifdef CONFIG_VIDEO_RETAIN call restore_screen # Restore screen contents #endif /* CONFIG_VIDEO_RETAIN */ #endif /* CONFIG_VIDEO_SELECT */ call mode_params # Store mode parameters popw %ds # Restore original DS ret # Detect if we have CGA, MDA, EGA or VGA and pass it to the kernel. basic_detect: movb $0, %fs:(PARAM_HAVE_VGA) movb $0x12, %ah # Check EGA/VGA movb $0x10, %bl int $0x10 movw %bx, %fs:(PARAM_VIDEO_EGA_BX) # Identifies EGA to the kernel cmpb $0x10, %bl # No, it's a CGA/MDA/HGA card. je basret incb adapter movw $0x1a00, %ax # Check EGA or VGA? int $0x10 cmpb $0x1a, %al # 1a means VGA... jne basret # anything else is EGA. incb %fs:(PARAM_HAVE_VGA) # We've detected a VGA incb adapter basret: ret # Store the video mode parameters for later usage by the kernel. # This is done by asking the BIOS except for the rows/columns # parameters in the default 80x25 mode -- these are set directly, # because some very obscure BIOSes supply insane values. mode_params: #ifdef CONFIG_VIDEO_SELECT cmpb $0, graphic_mode jnz mopar_gr #endif movb $0x03, %ah # Read cursor position xorb %bh, %bh int $0x10 movw %dx, %fs:(PARAM_CURSOR_POS) movb $0x0f, %ah # Read page/mode/width int $0x10 movw %bx, %fs:(PARAM_VIDEO_PAGE) movw %ax, %fs:(PARAM_VIDEO_MODE) # Video mode and screen width cmpb $0x7, %al # MDA/HGA => segment differs jnz mopar0 movw $0xb000, video_segment mopar0: movw %gs:(0x485), %ax # Font size movw %ax, %fs:(PARAM_FONT_POINTS) # (valid only on EGA/VGA) movw force_size, %ax # Forced size? orw %ax, %ax jz mopar1 movb %ah, %fs:(PARAM_VIDEO_COLS) movb %al, %fs:(PARAM_VIDEO_LINES) ret mopar1: movb $25, %al cmpb $0, adapter # If we are on CGA/MDA/HGA, the jz mopar2 # screen must have 25 lines. movb %gs:(0x484), %al # On EGA/VGA, use the EGA+ BIOS incb %al # location of max lines. mopar2: movb %al, %fs:(PARAM_VIDEO_LINES) ret #ifdef CONFIG_VIDEO_SELECT # Fetching of VESA frame buffer parameters mopar_gr: leaw modelist+1024, %di movb $0x23, %fs:(PARAM_HAVE_VGA) movw 16(%di), %ax movw %ax, %fs:(PARAM_LFB_LINELENGTH) movw 18(%di), %ax movw %ax, %fs:(PARAM_LFB_WIDTH) movw 20(%di), %ax movw %ax, %fs:(PARAM_LFB_HEIGHT) movb 25(%di), %al movb $0, %ah movw %ax, %fs:(PARAM_LFB_DEPTH) movb 29(%di), %al movb $0, %ah movw %ax, %fs:(PARAM_LFB_PAGES) movl 40(%di), %eax movl %eax, %fs:(PARAM_LFB_BASE) movl 31(%di), %eax movl %eax, %fs:(PARAM_LFB_COLORS) movl 35(%di), %eax movl %eax, %fs:(PARAM_LFB_COLORS+4) # get video mem size leaw modelist+1024, %di movw $0x4f00, %ax int $0x10 xorl %eax, %eax movw 18(%di), %ax movl %eax, %fs:(PARAM_LFB_SIZE) # get protected mode interface informations movw $0x4f0a, %ax xorw %bx, %bx xorw %di, %di int $0x10 cmp $0x004f, %ax jnz no_pm movw %es, %fs:(PARAM_VESAPM_SEG) movw %di, %fs:(PARAM_VESAPM_OFF) no_pm: ret # The video mode menu mode_menu: leaw keymsg, %si # "Return/Space/Timeout" message call prtstr call flush nokey: call getkt cmpb $0x0d, %al # ENTER ? je listm # yes - manual mode selection cmpb $0x20, %al # SPACE ? je defmd1 # no - repeat call beep jmp nokey defmd1: ret # No mode chosen? Default 80x25 listm: call mode_table # List mode table listm0: leaw name_bann, %si # Print adapter name call prtstr movw card_name, %si orw %si, %si jnz an2 movb adapter, %al leaw old_name, %si orb %al, %al jz an1 leaw ega_name, %si decb %al jz an1 leaw vga_name, %si jmp an1 an2: call prtstr leaw svga_name, %si an1: call prtstr leaw listhdr, %si # Table header call prtstr movb $0x30, %dl # DL holds mode number leaw modelist, %si lm1: cmpw $ASK_VGA, (%si) # End? jz lm2 movb %dl, %al # Menu selection number call prtchr call prtsp2 lodsw call prthw # Mode ID call prtsp2 movb 0x1(%si), %al call prtdec # Rows movb $0x78, %al # the letter 'x' call prtchr lodsw call prtdec # Columns movb $0x0d, %al # New line call prtchr movb $0x0a, %al call prtchr incb %dl # Next character cmpb $0x3a, %dl jnz lm1 movb $0x61, %dl jmp lm1 lm2: leaw prompt, %si # Mode prompt call prtstr leaw edit_buf, %di # Editor buffer lm3: call getkey cmpb $0x0d, %al # Enter? jz lment cmpb $0x08, %al # Backspace? jz lmbs cmpb $0x20, %al # Printable? jc lm3 cmpw $edit_buf+4, %di # Enough space? jz lm3 stosb call prtchr jmp lm3 lmbs: cmpw $edit_buf, %di # Backspace jz lm3 decw %di movb $0x08, %al call prtchr call prtspc movb $0x08, %al call prtchr jmp lm3 lment: movb $0, (%di) leaw crlft, %si call prtstr leaw edit_buf, %si cmpb $0, (%si) # Empty string = default mode jz lmdef cmpb $0, 1(%si) # One character = menu selection jz mnusel cmpw $0x6373, (%si) # "scan" => mode scanning jnz lmhx cmpw $0x6e61, 2(%si) jz lmscan lmhx: xorw %bx, %bx # Else => mode ID in hex lmhex: lodsb orb %al, %al jz lmuse1 subb $0x30, %al jc lmbad cmpb $10, %al jc lmhx1 subb $7, %al andb $0xdf, %al cmpb $10, %al jc lmbad cmpb $16, %al jnc lmbad lmhx1: shlw $4, %bx orb %al, %bl jmp lmhex lmuse1: movw %bx, %ax jmp lmuse mnusel: lodsb # Menu selection xorb %ah, %ah subb $0x30, %al jc lmbad cmpb $10, %al jc lmuse cmpb $0x61-0x30, %al jc lmbad subb $0x61-0x30-10, %al cmpb $36, %al jnc lmbad lmuse: call mode_set jc lmdef lmbad: leaw unknt, %si call prtstr jmp lm2 lmscan: cmpb $0, adapter # Scanning only on EGA/VGA jz lmbad movw $0, mt_end # Scanning of modes is movb $1, scanning # done as new autodetection. call mode_table jmp listm0 lmdef: ret # Additional parts of mode_set... (relative jumps, you know) setv7: # Video7 extended modes DO_STORE subb $VIDEO_FIRST_V7>>8, %bh movw $0x6f05, %ax int $0x10 stc ret _setrec: jmp setrec # Ugly... _set_80x25: jmp set_80x25 # Aliases for backward compatibility. setalias: movw $VIDEO_80x25, %ax incw %bx jz mode_set movb $VIDEO_8POINT-VIDEO_FIRST_SPECIAL, %al incw %bx jnz setbad # Fall-through! # Setting of user mode (AX=mode ID) => CF=success mode_set: movw %ax, %bx cmpb $0xff, %ah jz setalias testb $VIDEO_RECALC>>8, %ah jnz _setrec cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah jnc setres cmpb $VIDEO_FIRST_SPECIAL>>8, %ah jz setspc cmpb $VIDEO_FIRST_V7>>8, %ah jz setv7 cmpb $VIDEO_FIRST_VESA>>8, %ah jnc check_vesa orb %ah, %ah jz setmenu decb %ah jz setbios setbad: clc movb $0, do_restore # The screen needn't be restored ret setvesa: DO_STORE subb $VIDEO_FIRST_VESA>>8, %bh movw $0x4f02, %ax # VESA BIOS mode set call int $0x10 cmpw $0x004f, %ax # AL=4f if implemented jnz setbad # AH=0 if OK stc ret setbios: DO_STORE int $0x10 # Standard BIOS mode set call pushw %bx movb $0x0f, %ah # Check if really set int $0x10 popw %bx cmpb %bl, %al jnz setbad stc ret setspc: xorb %bh, %bh # Set special mode cmpb $VIDEO_LAST_SPECIAL-VIDEO_FIRST_SPECIAL, %bl jnc setbad addw %bx, %bx jmp *spec_inits(%bx) setmenu: orb %al, %al # 80x25 is an exception jz _set_80x25 pushw %bx # Set mode chosen from menu call mode_table # Build the mode table popw %ax shlw $2, %ax addw %ax, %si cmpw %di, %si jnc setbad movw (%si), %ax # Fetch mode ID _m_s: jmp mode_set setres: pushw %bx # Set mode chosen by resolution call mode_table popw %bx xchgb %bl, %bh setr1: lodsw cmpw $ASK_VGA, %ax # End of the list? jz setbad lodsw cmpw %bx, %ax jnz setr1 movw -4(%si), %ax # Fetch mode ID jmp _m_s check_vesa: leaw modelist+1024, %di subb $VIDEO_FIRST_VESA>>8, %bh movw %bx, %cx # Get mode information structure movw $0x4f01, %ax int $0x10 addb $VIDEO_FIRST_VESA>>8, %bh cmpw $0x004f, %ax jnz setbad movb (%di), %al # Check capabilities. andb $0x19, %al cmpb $0x09, %al jz setvesa # This is a text mode movb (%di), %al # Check capabilities. andb $0x99, %al cmpb $0x99, %al jnz _setbad # Doh! No linear frame buffer. subb $VIDEO_FIRST_VESA>>8, %bh orw $0x4000, %bx # Use linear frame buffer movw $0x4f02, %ax # VESA BIOS mode set call int $0x10 cmpw $0x004f, %ax # AL=4f if implemented jnz _setbad # AH=0 if OK movb $1, graphic_mode # flag graphic mode movb $0, do_restore # no screen restore stc ret _setbad: jmp setbad # Ugly... # Recalculate vertical display end registers -- this fixes various # inconsistencies of extended modes on many adapters. Called when # the VIDEO_RECALC flag is set in the mode ID. setrec: subb $VIDEO_RECALC>>8, %ah # Set the base mode call mode_set jnc rct3 movw %gs:(0x485), %ax # Font size in pixels movb %gs:(0x484), %bl # Number of rows incb %bl mulb %bl # Number of visible decw %ax # scan lines - 1 movw $0x3d4, %dx movw %ax, %bx movb $0x12, %al # Lower 8 bits movb %bl, %ah outw %ax, %dx movb $0x07, %al # Bits 8 and 9 in the overflow register call inidx xchgb %al, %ah andb $0xbd, %ah shrb %bh jnc rct1 orb $0x02, %ah rct1: shrb %bh jnc rct2 orb $0x40, %ah rct2: movb $0x07, %al outw %ax, %dx stc rct3: ret # Table of routines for setting of the special modes. spec_inits: .word set_80x25 .word set_8pixel .word set_80x43 .word set_80x28 .word set_current .word set_80x30 .word set_80x34 .word set_80x60 .word set_gfx # Set the 80x25 mode. If already set, do nothing. set_80x25: movw $0x5019, force_size # Override possibly broken BIOS use_80x25: #ifdef CONFIG_VIDEO_400_HACK movw $0x1202, %ax # Force 400 scan lines movb $0x30, %bl int $0x10 #else movb $0x0f, %ah # Get current mode ID int $0x10 cmpw $0x5007, %ax # Mode 7 (80x25 mono) is the only one available jz st80 # on CGA/MDA/HGA and is also available on EGAM cmpw $0x5003, %ax # Unknown mode, force 80x25 color jnz force3 st80: cmpb $0, adapter # CGA/MDA/HGA => mode 3/7 is always 80x25 jz set80 movb %gs:(0x0484), %al # This is EGA+ -- beware of 80x50 etc. orb %al, %al # Some buggy BIOS'es set 0 rows jz set80 cmpb $24, %al # It's hopefully correct jz set80 #endif /* CONFIG_VIDEO_400_HACK */ force3: DO_STORE movw $0x0003, %ax # Forced set int $0x10 set80: stc ret # Set the 80x50/80x43 8-pixel mode. Simple BIOS calls. set_8pixel: DO_STORE call use_80x25 # The base is 80x25 set_8pt: movw $0x1112, %ax # Use 8x8 font xorb %bl, %bl int $0x10 movw $0x1200, %ax # Use alternate print screen movb $0x20, %bl int $0x10 movw $0x1201, %ax # Turn off cursor emulation movb $0x34, %bl int $0x10 movb $0x01, %ah # Define cursor scan lines 6-7 movw $0x0607, %cx int $0x10 set_current: stc ret # Set the 80x28 mode. This mode works on all VGA's, because it's a standard # 80x25 mode with 14-point fonts instead of 16-point. set_80x28: DO_STORE call use_80x25 # The base is 80x25 set14: movw $0x1111, %ax # Use 9x14 font xorb %bl, %bl int $0x10 movb $0x01, %ah # Define cursor scan lines 11-12 movw $0x0b0c, %cx int $0x10 stc ret # Set the 80x43 mode. This mode is works on all VGA's. # It's a 350-scanline mode with 8-pixel font. set_80x43: DO_STORE movw $0x1201, %ax # Set 350 scans movb $0x30, %bl int $0x10 movw $0x0003, %ax # Reset video mode int $0x10 jmp set_8pt # Use 8-pixel font # Set the 80x30 mode (all VGA's). 480 scanlines, 16-pixel font. set_80x30: call use_80x25 # Start with real 80x25 DO_STORE movw $0x3cc, %dx # Get CRTC port inb %dx, %al movb $0xd4, %dl rorb %al # Mono or color? jc set48a movb $0xb4, %dl set48a: movw $0x0c11, %ax # Vertical sync end (also unlocks CR0-7) call outidx movw $0x0b06, %ax # Vertical total call outidx movw $0x3e07, %ax # (Vertical) overflow call outidx movw $0xea10, %ax # Vertical sync start call outidx movw $0xdf12, %ax # Vertical display end call outidx movw $0xe715, %ax # Vertical blank start call outidx movw $0x0416, %ax # Vertical blank end call outidx pushw %dx movb $0xcc, %dl # Misc output register (read) inb %dx, %al movb $0xc2, %dl # (write) andb $0x0d, %al # Preserve clock select bits and color bit orb $0xe2, %al # Set correct sync polarity outb %al, %dx popw %dx movw $0x501e, force_size stc # That's all. ret # Set the 80x34 mode (all VGA's). 480 scans, 14-pixel font. set_80x34: call set_80x30 # Set 480 scans call set14 # And 14-pt font movw $0xdb12, %ax # VGA vertical display end movw $0x5022, force_size setvde: call outidx stc ret # Set the 80x60 mode (all VGA's). 480 scans, 8-pixel font. set_80x60: call set_80x30 # Set 480 scans call set_8pt # And 8-pt font movw $0xdf12, %ax # VGA vertical display end movw $0x503c, force_size jmp setvde set_gfx: ret #ifdef CONFIG_VIDEO_RETAIN # Store screen contents to temporary buffer. store_screen: cmpb $0, do_restore # Already stored? jnz stsr testb $CAN_USE_HEAP, loadflags # Have we space for storing? jz stsr pushw %ax pushw %bx pushw force_size # Don't force specific size movw $0, force_size call mode_params # Obtain params of current mode popw force_size movb %fs:(PARAM_VIDEO_LINES), %ah movb %fs:(PARAM_VIDEO_COLS), %al movw %ax, %bx # BX=dimensions mulb %ah movw %ax, %cx # CX=number of characters addw %ax, %ax # Calculate image size addw $modelist+1024+4, %ax cmpw heap_end_ptr, %ax jnc sts1 # Unfortunately, out of memory movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params leaw modelist+1024, %di stosw movw %bx, %ax stosw pushw %ds # Store the screen movw video_segment, %ds xorw %si, %si rep movsw popw %ds incb do_restore # Screen will be restored later sts1: popw %bx popw %ax stsr: ret # Restore screen contents from temporary buffer. restore_screen: cmpb $0, do_restore # Has the screen been stored? jz res1 call mode_params # Get parameters of current mode movb %fs:(PARAM_VIDEO_LINES), %cl movb %fs:(PARAM_VIDEO_COLS), %ch leaw modelist+1024, %si # Screen buffer lodsw # Set cursor position movw %ax, %dx cmpb %cl, %dh jc res2 movb %cl, %dh decb %dh res2: cmpb %ch, %dl jc res3 movb %ch, %dl decb %dl res3: movb $0x02, %ah movb $0x00, %bh int $0x10 lodsw # Display size movb %ah, %dl # DL=number of lines movb $0, %ah # BX=phys. length of orig. line movw %ax, %bx cmpb %cl, %dl # Too many? jc res4 pushw %ax movb %dl, %al subb %cl, %al mulb %bl addw %ax, %si addw %ax, %si popw %ax movb %cl, %dl res4: cmpb %ch, %al # Too wide? jc res5 movb %ch, %al # AX=width of src. line res5: movb $0, %cl xchgb %ch, %cl movw %cx, %bp # BP=width of dest. line pushw %es movw video_segment, %es xorw %di, %di # Move the data addw %bx, %bx # Convert BX and BP to _bytes_ addw %bp, %bp res6: pushw %si pushw %di movw %ax, %cx rep movsw popw %di popw %si addw %bp, %di addw %bx, %si decb %dl jnz res6 popw %es # Done res1: ret #endif /* CONFIG_VIDEO_RETAIN */ # Write to indexed VGA register (AL=index, AH=data, DX=index reg. port) outidx: outb %al, %dx pushw %ax movb %ah, %al incw %dx outb %al, %dx decw %dx popw %ax ret # Build the table of video modes (stored after the setup.S code at the # `modelist' label. Each video mode record looks like: # .word MODE-ID (our special mode ID (see above)) # .byte rows (number of rows) # .byte columns (number of columns) # Returns address of the end of the table in DI, the end is marked # with a ASK_VGA ID. mode_table: movw mt_end, %di # Already filled? orw %di, %di jnz mtab1x leaw modelist, %di # Store standard modes: movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL) stosl movb adapter, %al # CGA/MDA/HGA -- no more modes orb %al, %al jz mtabe decb %al jnz mtabv movl $VIDEO_8POINT + 0x502b0000, %eax # The 80x43 EGA mode stosl jmp mtabe mtab1x: jmp mtab1 mtabv: leaw vga_modes, %si # All modes for std VGA movw $vga_modes_end-vga_modes, %cx rep # I'm unable to use movsw as I don't know how to store a half movsb # of the expression above to cx without using explicit shr. cmpb $0, scanning # Mode scan requested? jz mscan1 call mode_scan mscan1: #ifdef CONFIG_VIDEO_LOCAL call local_modes #endif /* CONFIG_VIDEO_LOCAL */ #ifdef CONFIG_VIDEO_VESA call vesa_modes # Detect VESA VGA modes #endif /* CONFIG_VIDEO_VESA */ #ifdef CONFIG_VIDEO_SVGA cmpb $0, scanning # Bypass when scanning jnz mscan2 call svga_modes # Detect SVGA cards & modes mscan2: #endif /* CONFIG_VIDEO_SVGA */ mtabe: #ifdef CONFIG_VIDEO_COMPACT leaw modelist, %si movw %di, %dx movw %si, %di cmt1: cmpw %dx, %si # Scan all modes jz cmt2 leaw modelist, %bx # Find in previous entries movw 2(%si), %cx cmt3: cmpw %bx, %si jz cmt4 cmpw 2(%bx), %cx # Found => don't copy this entry jz cmt5 addw $4, %bx jmp cmt3 cmt4: movsl # Copy entry jmp cmt1 cmt5: addw $4, %si # Skip entry jmp cmt1 cmt2: #endif /* CONFIG_VIDEO_COMPACT */ movw $ASK_VGA, (%di) # End marker movw %di, mt_end mtab1: leaw modelist, %si # SI=mode list, DI=list end ret0: ret # Modes usable on all standard VGAs vga_modes: .word VIDEO_8POINT .word 0x5032 # 80x50 .word VIDEO_80x43 .word 0x502b # 80x43 .word VIDEO_80x28 .word 0x501c # 80x28 .word VIDEO_80x30 .word 0x501e # 80x30 .word VIDEO_80x34 .word 0x5022 # 80x34 .word VIDEO_80x60 .word 0x503c # 80x60 vga_modes_end: # Detect VESA modes. #ifdef CONFIG_VIDEO_VESA vesa_modes: cmpb $2, adapter # VGA only jnz ret0 movw %di, %bp # BP=original mode table end addw $0x200, %di # Buffer space movw $0x4f00, %ax # VESA Get card info call int $0x10 movw %bp, %di cmpw $0x004f, %ax # Successful? jnz ret0 cmpw $0x4556, 0x200(%di) jnz ret0 cmpw $0x4153, 0x202(%di) jnz ret0 movw $vesa_name, card_name # Set name to "VESA VGA" pushw %gs lgsw 0x20e(%di), %si # GS:SI=mode list movw $128, %cx # Iteration limit vesa1: # gas version 2.9.1, using BFD version 2.9.1.0.23 buggers the next inst. # XXX: lodsw %gs:(%si), %ax # Get next mode in the list gs; lodsw cmpw $0xffff, %ax # End of the table? jz vesar cmpw $0x0080, %ax # Check validity of mode ID jc vesa2 orb %ah, %ah # Valid IDs: 0x0000-0x007f/0x0100-0x07ff jz vesan # Certain BIOSes report 0x80-0xff! cmpw $0x0800, %ax jnc vesae vesa2: pushw %cx movw %ax, %cx # Get mode information structure movw $0x4f01, %ax int $0x10 movw %cx, %bx # BX=mode number addb $VIDEO_FIRST_VESA>>8, %bh popw %cx cmpw $0x004f, %ax jnz vesan # Don't report errors (buggy BIOSES) movb (%di), %al # Check capabilities. We require andb $0x19, %al # a color text mode. cmpb $0x09, %al jnz vesan cmpw $0xb800, 8(%di) # Standard video memory address required jnz vesan testb $2, (%di) # Mode characteristics supplied? movw %bx, (%di) # Store mode number jz vesa3 xorw %dx, %dx movw 0x12(%di), %bx # Width orb %bh, %bh jnz vesan movb %bl, 0x3(%di) movw 0x14(%di), %ax # Height orb %ah, %ah jnz vesan movb %al, 2(%di) mulb %bl cmpw $8193, %ax # Small enough for Linux console driver? jnc vesan jmp vesaok vesa3: subw $0x8108, %bx # This mode has no detailed info specified, jc vesan # so it must be a standard VESA mode. cmpw $5, %bx jnc vesan movw vesa_text_mode_table(%bx), %ax movw %ax, 2(%di) vesaok: addw $4, %di # The mode is valid. Store it. vesan: loop vesa1 # Next mode. Limit exceeded => error vesae: leaw vesaer, %si call prtstr movw %bp, %di # Discard already found modes. vesar: popw %gs ret # Dimensions of standard VESA text modes vesa_text_mode_table: .byte 60, 80 # 0108 .byte 25, 132 # 0109 .byte 43, 132 # 010A .byte 50, 132 # 010B .byte 60, 132 # 010C #endif /* CONFIG_VIDEO_VESA */ # Scan for video modes. A bit dirty, but should work. mode_scan: movw $0x0100, %cx # Start with mode 0 scm1: movb $0, %ah # Test the mode movb %cl, %al int $0x10 movb $0x0f, %ah int $0x10 cmpb %cl, %al jnz scm2 # Mode not set movw $0x3c0, %dx # Test if it's a text mode movb $0x10, %al # Mode bits call inidx andb $0x03, %al jnz scm2 movb $0xce, %dl # Another set of mode bits movb $0x06, %al call inidx shrb %al jc scm2 movb $0xd4, %dl # Cursor location movb $0x0f, %al call inidx orb %al, %al jnz scm2 movw %cx, %ax # Ok, store the mode stosw movb %gs:(0x484), %al # Number of rows incb %al stosb movw %gs:(0x44a), %ax # Number of columns stosb scm2: incb %cl jns scm1 movw $0x0003, %ax # Return back to mode 3 int $0x10 ret tstidx: outw %ax, %dx # OUT DX,AX and inidx inidx: outb %al, %dx # Read from indexed VGA register incw %dx # AL=index, DX=index reg port -> AL=data inb %dx, %al decw %dx ret # Try to detect type of SVGA card and supply (usually approximate) video # mode table for it. #ifdef CONFIG_VIDEO_SVGA svga_modes: leaw svga_table, %si # Test all known SVGA adapters dosvga: lodsw movw %ax, %bp # Default mode table orw %ax, %ax jz didsv1 lodsw # Pointer to test routine pushw %si pushw %di pushw %es movw $0xc000, %bx movw %bx, %es call *%ax # Call test routine popw %es popw %di popw %si orw %bp, %bp jz dosvga movw %bp, %si # Found, copy the modes movb svga_prefix, %ah cpsvga: lodsb orb %al, %al jz didsv stosw movsw jmp cpsvga didsv: movw %si, card_name # Store pointer to card name didsv1: ret # Table of all known SVGA cards. For each card, we store a pointer to # a table of video modes supported by the card and a pointer to a routine # used for testing of presence of the card. The video mode table is always # followed by the name of the card or the chipset. svga_table: .word ati_md, ati_test .word oak_md, oak_test .word paradise_md, paradise_test .word realtek_md, realtek_test .word s3_md, s3_test .word chips_md, chips_test .word video7_md, video7_test .word cirrus5_md, cirrus5_test .word cirrus6_md, cirrus6_test .word cirrus1_md, cirrus1_test .word ahead_md, ahead_test .word everex_md, everex_test .word genoa_md, genoa_test .word trident_md, trident_test .word tseng_md, tseng_test .word 0 # Test routines and mode tables: # S3 - The test algorithm was taken from the SuperProbe package # for XFree86 1.2.1. Report bugs to Christoph.Niemann@linux.org s3_test: movw $0x0f35, %cx # we store some constants in cl/ch movw $0x03d4, %dx movb $0x38, %al call inidx movb %al, %bh # store current CRT-register 0x38 movw $0x0038, %ax call outidx # disable writing to special regs movb %cl, %al # check whether we can write special reg 0x35 call inidx movb %al, %bl # save the current value of CRT reg 0x35 andb $0xf0, %al # clear bits 0-3 movb %al, %ah movb %cl, %al # and write it to CRT reg 0x35 call outidx call inidx # now read it back andb %ch, %al # clear the upper 4 bits jz s3_2 # the first test failed. But we have a movb %bl, %ah # second chance movb %cl, %al call outidx jmp s3_1 # do the other tests s3_2: movw %cx, %ax # load ah with 0xf and al with 0x35 orb %bl, %ah # set the upper 4 bits of ah with the orig value call outidx # write ... call inidx # ... and reread andb %cl, %al # turn off the upper 4 bits pushw %ax movb %bl, %ah # restore old value in register 0x35 movb %cl, %al call outidx popw %ax cmpb %ch, %al # setting lower 4 bits was successful => bad je no_s3 # writing is allowed => this is not an S3 s3_1: movw $0x4838, %ax # allow writing to special regs by putting call outidx # magic number into CRT-register 0x38 movb %cl, %al # check whether we can write special reg 0x35 call inidx movb %al, %bl andb $0xf0, %al movb %al, %ah movb %cl, %al call outidx call inidx andb %ch, %al jnz no_s3 # no, we can't write => no S3 movw %cx, %ax orb %bl, %ah call outidx call inidx andb %ch, %al pushw %ax movb %bl, %ah # restore old value in register 0x35 movb %cl, %al call outidx popw %ax cmpb %ch, %al jne no_s31 # writing not possible => no S3 movb $0x30, %al call inidx # now get the S3 id ... leaw idS3, %di movw $0x10, %cx repne scasb je no_s31 movb %bh, %ah movb $0x38, %al jmp s3rest no_s3: movb $0x35, %al # restore CRT register 0x35 movb %bl, %ah call outidx no_s31: xorw %bp, %bp # Detection failed s3rest: movb %bh, %ah movb $0x38, %al # restore old value of CRT register 0x38 jmp outidx idS3: .byte 0x81, 0x82, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95 .byte 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa8, 0xb0 s3_md: .byte 0x54, 0x2b, 0x84 .byte 0x55, 0x19, 0x84 .byte 0 .ascii "S3" .byte 0 # ATI cards. ati_test: leaw idati, %si movw $0x31, %di movw $0x09, %cx repe cmpsb je atiok xorw %bp, %bp atiok: ret idati: .ascii "761295520" ati_md: .byte 0x23, 0x19, 0x84 .byte 0x33, 0x2c, 0x84 .byte 0x22, 0x1e, 0x64 .byte 0x21, 0x19, 0x64 .byte 0x58, 0x21, 0x50 .byte 0x5b, 0x1e, 0x50 .byte 0 .ascii "ATI" .byte 0 # AHEAD ahead_test: movw $0x200f, %ax movw $0x3ce, %dx outw %ax, %dx incw %dx inb %dx, %al cmpb $0x20, %al je isahed cmpb $0x21, %al je isahed xorw %bp, %bp isahed: ret ahead_md: .byte 0x22, 0x2c, 0x84 .byte 0x23, 0x19, 0x84 .byte 0x24, 0x1c, 0x84 .byte 0x2f, 0x32, 0xa0 .byte 0x32, 0x22, 0x50 .byte 0x34, 0x42, 0x50 .byte 0 .ascii "Ahead" .byte 0 # Chips & Tech. chips_test: movw $0x3c3, %dx inb %dx, %al orb $0x10, %al outb %al, %dx movw $0x104, %dx inb %dx, %al movb %al, %bl movw $0x3c3, %dx inb %dx, %al andb $0xef, %al outb %al, %dx cmpb $0xa5, %bl je cantok xorw %bp, %bp cantok: ret chips_md: .byte 0x60, 0x19, 0x84 .byte 0x61, 0x32, 0x84 .byte 0 .ascii "Chips & Technologies" .byte 0 # Cirrus Logic 5X0 cirrus1_test: movw $0x3d4, %dx movb $0x0c, %al outb %al, %dx incw %dx inb %dx, %al movb %al, %bl xorb %al, %al outb %al, %dx decw %dx movb $0x1f, %al outb %al, %dx incw %dx inb %dx, %al movb %al, %bh xorb %ah, %ah shlb $4, %al movw %ax, %cx movb %bh, %al shrb $4, %al addw %ax, %cx shlw $8, %cx addw $6, %cx movw %cx, %ax movw $0x3c4, %dx outw %ax, %dx incw %dx inb %dx, %al andb %al, %al jnz nocirr movb %bh, %al outb %al, %dx inb %dx, %al cmpb $0x01, %al je iscirr nocirr: xorw %bp, %bp iscirr: movw $0x3d4, %dx movb %bl, %al xorb %ah, %ah shlw $8, %ax addw $0x0c, %ax outw %ax, %dx ret cirrus1_md: .byte 0x1f, 0x19, 0x84 .byte 0x20, 0x2c, 0x84 .byte 0x22, 0x1e, 0x84 .byte 0x31, 0x25, 0x64 .byte 0 .ascii "Cirrus Logic 5X0" .byte 0 # Cirrus Logic 54XX cirrus5_test: movw $0x3c4, %dx movb $6, %al call inidx movb %al, %bl # BL=backup movw $6, %ax call tstidx cmpb $0x0f, %al jne c5fail movw $0x1206, %ax call tstidx cmpb $0x12, %al jne c5fail movb $0x1e, %al call inidx movb %al, %bh movb %bh, %ah andb $0xc0, %ah movb $0x1e, %al call tstidx andb $0x3f, %al jne c5xx movb $0x1e, %al movb %bh, %ah orb $0x3f, %ah call tstidx xorb $0x3f, %al andb $0x3f, %al c5xx: pushf movb $0x1e, %al movb %bh, %ah outw %ax, %dx popf je c5done c5fail: xorw %bp, %bp c5done: movb $6, %al movb %bl, %ah outw %ax, %dx ret cirrus5_md: .byte 0x14, 0x19, 0x84 .byte 0x54, 0x2b, 0x84 .byte 0 .ascii "Cirrus Logic 54XX" .byte 0 # Cirrus Logic 64XX -- no known extra modes, but must be identified, because # it's misidentified by the Ahead test. cirrus6_test: movw $0x3ce, %dx movb $0x0a, %al call inidx movb %al, %bl # BL=backup movw $0xce0a, %ax call tstidx orb %al, %al jne c2fail movw $0xec0a, %ax call tstidx cmpb $0x01, %al jne c2fail movb $0xaa, %al call inidx # 4X, 5X, 7X and 8X are valid 64XX chip ID's. shrb $4, %al subb $4, %al jz c6done decb %al jz c6done subb $2, %al jz c6done decb %al jz c6done c2fail: xorw %bp, %bp c6done: movb $0x0a, %al movb %bl, %ah outw %ax, %dx ret cirrus6_md: .byte 0 .ascii "Cirrus Logic 64XX" .byte 0 # Everex / Trident everex_test: movw $0x7000, %ax xorw %bx, %bx int $0x10 cmpb $0x70, %al jne noevrx shrw $4, %dx cmpw $0x678, %dx je evtrid cmpw $0x236, %dx jne evrxok evtrid: leaw trident_md, %bp evrxok: ret noevrx: xorw %bp, %bp ret everex_md: .byte 0x03, 0x22, 0x50 .byte 0x04, 0x3c, 0x50 .byte 0x07, 0x2b, 0x64 .byte 0x08, 0x4b, 0x64 .byte 0x0a, 0x19, 0x84 .byte 0x0b, 0x2c, 0x84 .byte 0x16, 0x1e, 0x50 .byte 0x18, 0x1b, 0x64 .byte 0x21, 0x40, 0xa0 .byte 0x40, 0x1e, 0x84 .byte 0 .ascii "Everex/Trident" .byte 0 # Genoa. genoa_test: leaw idgenoa, %si # Check Genoa 'clues' xorw %ax, %ax movb %es:(0x37), %al movw %ax, %di movw $0x04, %cx decw %si decw %di l1: incw %si incw %di movb (%si), %al testb %al, %al jz l2 cmpb %es:(%di), %al l2: loope l1 orw %cx, %cx je isgen xorw %bp, %bp isgen: ret idgenoa: .byte 0x77, 0x00, 0x99, 0x66 genoa_md: .byte 0x58, 0x20, 0x50 .byte 0x5a, 0x2a, 0x64 .byte 0x60, 0x19, 0x84 .byte 0x61, 0x1d, 0x84 .byte 0x62, 0x20, 0x84 .byte 0x63, 0x2c, 0x84 .byte 0x64, 0x3c, 0x84 .byte 0x6b, 0x4f, 0x64 .byte 0x72, 0x3c, 0x50 .byte 0x74, 0x42, 0x50 .byte 0x78, 0x4b, 0x64 .byte 0 .ascii "Genoa" .byte 0 # OAK oak_test: leaw idoakvga, %si movw $0x08, %di movw $0x08, %cx repe cmpsb je isoak xorw %bp, %bp isoak: ret idoakvga: .ascii "OAK VGA " oak_md: .byte 0x4e, 0x3c, 0x50 .byte 0x4f, 0x3c, 0x84 .byte 0x50, 0x19, 0x84 .byte 0x51, 0x2b, 0x84 .byte 0 .ascii "OAK" .byte 0 # WD Paradise. paradise_test: leaw idparadise, %si movw $0x7d, %di movw $0x04, %cx repe cmpsb je ispara xorw %bp, %bp ispara: ret idparadise: .ascii "VGA=" paradise_md: .byte 0x41, 0x22, 0x50 .byte 0x47, 0x1c, 0x84 .byte 0x55, 0x19, 0x84 .byte 0x54, 0x2c, 0x84 .byte 0 .ascii "Paradise" .byte 0 # Trident. trident_test: movw $0x3c4, %dx movb $0x0e, %al outb %al, %dx incw %dx inb %dx, %al xchgb %al, %ah xorb %al, %al outb %al, %dx inb %dx, %al xchgb %ah, %al movb %al, %bl # Strange thing ... in the book this wasn't andb $0x02, %bl # necessary but it worked on my card which jz setb2 # is a trident. Without it the screen goes # blurred ... andb $0xfd, %al jmp clrb2 setb2: orb $0x02, %al clrb2: outb %al, %dx andb $0x0f, %ah cmpb $0x02, %ah je istrid xorw %bp, %bp istrid: ret trident_md: .byte 0x50, 0x1e, 0x50 .byte 0x51, 0x2b, 0x50 .byte 0x52, 0x3c, 0x50 .byte 0x57, 0x19, 0x84 .byte 0x58, 0x1e, 0x84 .byte 0x59, 0x2b, 0x84 .byte 0x5a, 0x3c, 0x84 .byte 0 .ascii "Trident" .byte 0 # Tseng. tseng_test: movw $0x3cd, %dx inb %dx, %al # Could things be this simple ! :-) movb %al, %bl movb $0x55, %al outb %al, %dx inb %dx, %al movb %al, %ah movb %bl, %al outb %al, %dx cmpb $0x55, %ah je istsen isnot: xorw %bp, %bp istsen: ret tseng_md: .byte 0x26, 0x3c, 0x50 .byte 0x2a, 0x28, 0x64 .byte 0x23, 0x19, 0x84 .byte 0x24, 0x1c, 0x84 .byte 0x22, 0x2c, 0x84 .byte 0x21, 0x3c, 0x84 .byte 0 .ascii "Tseng" .byte 0 # Video7. video7_test: movw $0x3cc, %dx inb %dx, %al movw $0x3b4, %dx andb $0x01, %al jz even7 movw $0x3d4, %dx even7: movb $0x0c, %al outb %al, %dx incw %dx inb %dx, %al movb %al, %bl movb $0x55, %al outb %al, %dx inb %dx, %al decw %dx movb $0x1f, %al outb %al, %dx incw %dx inb %dx, %al movb %al, %bh decw %dx movb $0x0c, %al outb %al, %dx incw %dx movb %bl, %al outb %al, %dx movb $0x55, %al xorb $0xea, %al cmpb %bh, %al jne isnot movb $VIDEO_FIRST_V7>>8, svga_prefix # Use special mode switching ret video7_md: .byte 0x40, 0x2b, 0x50 .byte 0x43, 0x3c, 0x50 .byte 0x44, 0x3c, 0x64 .byte 0x41, 0x19, 0x84 .byte 0x42, 0x2c, 0x84 .byte 0x45, 0x1c, 0x84 .byte 0 .ascii "Video 7" .byte 0 # Realtek VGA realtek_test: leaw idrtvga, %si movw $0x45, %di movw $0x0b, %cx repe cmpsb je isrt xorw %bp, %bp isrt: ret idrtvga: .ascii "REALTEK VGA" realtek_md: .byte 0x1a, 0x3c, 0x50 .byte 0x1b, 0x19, 0x84 .byte 0x1c, 0x1e, 0x84 .byte 0x1d, 0x2b, 0x84 .byte 0x1e, 0x3c, 0x84 .byte 0 .ascii "REALTEK" .byte 0 #endif /* CONFIG_VIDEO_SVGA */ # User-defined local mode table (VGA only) #ifdef CONFIG_VIDEO_LOCAL local_modes: leaw local_mode_table, %si locm1: lodsw orw %ax, %ax jz locm2 stosw movsw jmp locm1 locm2: ret # This is the table of local video modes which can be supplied manually # by the user. Each entry consists of mode ID (word) and dimensions # (byte for column count and another byte for row count). These modes # are placed before all SVGA and VESA modes and override them if table # compacting is enabled. The table must end with a zero word followed # by NUL-terminated video adapter name. local_mode_table: .word 0x0100 # Example: 40x25 .byte 25,40 .word 0 .ascii "Local" .byte 0 #endif /* CONFIG_VIDEO_LOCAL */ # Read a key and return the ASCII code in al, scan code in ah getkey: xorb %ah, %ah int $0x16 ret # Read a key with a timeout of 30 seconds. # The hardware clock is used to get the time. getkt: call gettime addb $30, %al # Wait 30 seconds cmpb $60, %al jl lminute subb $60, %al lminute: movb %al, %cl again: movb $0x01, %ah int $0x16 jnz getkey # key pressed, so get it call gettime cmpb %cl, %al jne again movb $0x20, %al # timeout, return `space' ret # Flush the keyboard buffer flush: movb $0x01, %ah int $0x16 jz empty xorb %ah, %ah int $0x16 jmp flush empty: ret # Print hexadecimal number. prthw: pushw %ax movb %ah, %al call prthb popw %ax prthb: pushw %ax shrb $4, %al call prthn popw %ax andb $0x0f, %al prthn: cmpb $0x0a, %al jc prth1 addb $0x07, %al prth1: addb $0x30, %al jmp prtchr # Print decimal number in al prtdec: pushw %ax pushw %cx xorb %ah, %ah movb $0x0a, %cl idivb %cl cmpb $0x09, %al jbe lt100 call prtdec jmp skip10 lt100: addb $0x30, %al call prtchr skip10: movb %ah, %al addb $0x30, %al call prtchr popw %cx popw %ax ret # VIDEO_SELECT-only variables mt_end: .word 0 # End of video mode table if built edit_buf: .space 6 # Line editor buffer card_name: .word 0 # Pointer to adapter name scanning: .byte 0 # Performing mode scan do_restore: .byte 0 # Screen contents altered during mode change svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes graphic_mode: .byte 0 # Graphic mode with a linear frame buffer # Status messages keymsg: .ascii "Press to see video modes available, " .ascii " to continue or wait 30 secs" .byte 0x0d, 0x0a, 0 listhdr: .byte 0x0d, 0x0a .ascii "Mode: COLSxROWS:" crlft: .byte 0x0d, 0x0a, 0 prompt: .byte 0x0d, 0x0a .asciz "Enter mode number or `scan': " unknt: .asciz "Unknown mode ID. Try again." badmdt: .ascii "You passed an undefined mode number." .byte 0x0d, 0x0a, 0 vesaer: .ascii "Error: Scanning of VESA modes failed. Please " .ascii "report to ." .byte 0x0d, 0x0a, 0 old_name: .asciz "CGA/MDA/HGA" ega_name: .asciz "EGA" svga_name: .ascii " " vga_name: .asciz "VGA" vesa_name: .asciz "VESA" name_bann: .asciz "Video adapter: " #endif /* CONFIG_VIDEO_SELECT */ # Other variables: adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA video_segment: .word 0xb800 # Video memory segment force_size: .word 0 # Use this size instead of the one in BIOS vars