diff options
Diffstat (limited to 'arch/i386/boot/video.S')
| -rw-r--r-- | arch/i386/boot/video.S | 2007 |
1 files changed, 2007 insertions, 0 deletions
diff --git a/arch/i386/boot/video.S b/arch/i386/boot/video.S new file mode 100644 index 0000000..925d3f5 --- /dev/null +++ b/arch/i386/boot/video.S @@ -0,0 +1,2007 @@ +/* video.S + * + * Display adapter & video mode setup, version 2.13 (14-May-99) + * + * Copyright (C) 1995 -- 1998 Martin Mares <mj@ucw.cz> + * Based on the original setup.S code (C) Linus Torvalds and Mats Anderson + * + * Rewritten to use GNU 'as' by Chris Noe <stiker@northlink.com> May 1999 + * + * For further information, look at Documentation/svga.txt. + * + */ + +#include <linux/config.h> /* 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_GFX_HACK 0x0f08 +#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 PARAM_VESA_ATTRIB 0x34 + +/* 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 */ + call store_edid +#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) + movw 0(%di), %ax + movw %ax, %fs:(PARAM_VESA_ATTRIB) + +# 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) + +# switching the DAC to 8-bit is for <= 8 bpp only + movw %fs:(PARAM_LFB_DEPTH), %ax + cmpw $8, %ax + jg dac_done + +# get DAC switching capability + xorl %eax, %eax + movb 10(%di), %al + testb $1, %al + jz dac_set + +# attempt to switch DAC to 8-bit + movw $0x4f08, %ax + movw $0x0800, %bx + int $0x10 + cmpw $0x004f, %ax + jne dac_set + movb %bh, dac_size # store actual DAC size + +dac_set: +# set color size to DAC size + movb dac_size, %al + movb %al, %fs:(PARAM_LFB_COLORS+0) + movb %al, %fs:(PARAM_LFB_COLORS+2) + movb %al, %fs:(PARAM_LFB_COLORS+4) + movb %al, %fs:(PARAM_LFB_COLORS+6) + +# set color offsets to 0 + movb $0, %fs:(PARAM_LFB_COLORS+1) + movb $0, %fs:(PARAM_LFB_COLORS+3) + movb $0, %fs:(PARAM_LFB_COLORS+5) + movb $0, %fs:(PARAM_LFB_COLORS+7) + +dac_done: +# 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, %fs:(0x01fa) # Store mode for use in acpi_wakeup.S + 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 + +# Special hack for ThinkPad graphics +set_gfx: +#ifdef CONFIG_VIDEO_GFX_HACK + movw $VIDEO_GFX_BIOS_AX, %ax + movw $VIDEO_GFX_BIOS_BX, %bx + int $0x10 + movw $VIDEO_GFX_DUMMY_RESOLUTION, force_size + stc +#endif + 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 +#ifdef CONFIG_VIDEO_GFX_HACK + .word VIDEO_GFX_HACK + .word VIDEO_GFX_DUMMY_RESOLUTION +#endif + +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 + +store_edid: + pushw %es # just save all registers + pushw %ax + pushw %bx + pushw %cx + pushw %dx + pushw %di + + pushw %fs + popw %es + + movl $0x13131313, %eax # memset block with 0x13 + movw $32, %cx + movw $0x140, %di + cld + rep + stosl + + movw $0x4f15, %ax # do VBE/DDC + movw $0x01, %bx + movw $0x00, %cx + movw $0x01, %dx + movw $0x140, %di + int $0x10 + + popw %di # restore all registers + popw %dx + popw %cx + popw %bx + popw %ax + popw %es + 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 +dac_size: .byte 6 # DAC bit depth + +# Status messages +keymsg: .ascii "Press <RETURN> to see video modes available, " + .ascii "<SPACE> 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 <mj@ucw.cz>." + .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 |