132 lines
3.4 KiB
PHP
132 lines
3.4 KiB
PHP
;; $Id: font.inc,v 1.7 2004/12/27 07:04:08 hpa Exp $
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;; -----------------------------------------------------------------------
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;;
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;; Copyright 1994-2004 H. Peter Anvin - All Rights Reserved
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;;
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
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;; Boston MA 02111-1307, USA; either version 2 of the License, or
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;; (at your option) any later version; incorporated herein by reference.
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;;
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;; -----------------------------------------------------------------------
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;;
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;; font.inc
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;;
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;; VGA font handling code
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;;
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section .text
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;
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; loadfont: Load a .psf font file and install it onto the VGA console
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; (if we're not on a VGA screen then ignore.) It is called with
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; SI and DX:AX set by routine searchdir
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;
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loadfont:
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mov bx,trackbuf ; The trackbuf is >= 16K; the part
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mov cx,[BufSafe] ; of a PSF file we care about is no
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call getfssec ; more than 8K+4 bytes
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mov ax,[trackbuf] ; Magic number
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cmp ax,0436h
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jne lf_ret
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mov al,[trackbuf+2] ; File mode
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cmp al,5 ; Font modes 0-5 supported
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ja lf_ret
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mov bh,byte [trackbuf+3] ; Height of font
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cmp bh,2 ; VGA minimum
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jb lf_ret
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cmp bh,32 ; VGA maximum
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ja lf_ret
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; Copy to font buffer
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mov si,trackbuf+4 ; Start of font data
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mov [VGAFontSize],bh
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mov di,vgafontbuf
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mov cx,(32*256) >> 2 ; Maximum size
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rep movsd
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mov [UserFont], byte 1 ; Set font flag
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; Fall through to use_font
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;
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; use_font:
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; This routine activates whatever font happens to be in the
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; vgafontbuf, and updates the adjust_screen data.
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; Must be called with CS = DS = ES
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;
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use_font:
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test [UserFont], byte 1 ; Are we using a user-specified font?
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jz adjust_screen ; If not, just do the normal stuff
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mov bp,vgafontbuf
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mov bh,[VGAFontSize]
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xor bl,bl ; Needed by both INT 10h calls
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cmp [UsingVGA], byte 1 ; Are we in graphics mode?
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jne .text
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.graphics:
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xor cx,cx
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mov cl,bh ; CX = bytes/character
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mov ax,480
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div cl ; Compute char rows per screen
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mov dl,al
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dec al
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mov [VidRows],al
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mov ax,1121h ; Set user character table
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int 10h
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mov [VidCols], byte 79 ; Always 80 bytes/line
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.lf_ret: ret ; No need to call adjust_screen
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.text:
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mov cx,256
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xor dx,dx
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mov ax,1110h
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int 10h ; Load into VGA RAM
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xor bl,bl
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mov ax,1103h ; Select page 0
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int 10h
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; Fall through to adjust_screen
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lf_ret equ use_font.lf_ret
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;
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; adjust_screen: Set the internal variables associated with the screen size.
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; This is a subroutine in case we're loading a custom font.
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;
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adjust_screen:
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pusha
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mov al,[BIOS_vidrows]
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and al,al
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jnz vidrows_ok
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mov al,24 ; No vidrows in BIOS, assume 25
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; (Remember: vidrows == rows-1)
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vidrows_ok: mov [VidRows],al
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mov ah,0fh
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int 10h ; Read video state
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dec ah ; Store count-1 (same as rows)
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mov [VidCols],ah
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popa
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ret
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; VGA font buffer at the end of memory (so loading a font works even
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; in graphics mode, but don't put too much pressure on the .bss)
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section .latebss
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vgafontbuf resb 8192
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section .data
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align 2, db 0
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VGAFontSize dw 16 ; Defaults to 16 byte font
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UserFont db 0 ; Using a user-specified font
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