Diff of /trunk/mkinitrd-magellan/isolinux/font.inc

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	revision 1132 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 1133 by niro, Thu Aug 19 09:50:43 2010 UTC
#	Line 1	Line 1
	;; $Id: font.inc,v 1.1 2007-09-01 22:44:04 niro Exp $
1	;; -----------------------------------------------------------------------	;; -----------------------------------------------------------------------
2	;;	;;
3	;;   Copyright 1994-2004 H. Peter Anvin - All Rights Reserved	;;   Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
4	;;	;;
5	;;   This program is free software; you can redistribute it and/or modify	;;   This program is free software; you can redistribute it and/or modify
6	;;   it under the terms of the GNU General Public License as published by	;;   it under the terms of the GNU General Public License as published by
#	Line 21	Line 20
20
21	;	;
22	; loadfont: Load a .psf font file and install it onto the VGA console	; loadfont: Load a .psf font file and install it onto the VGA console
23	; (if we're not on a VGA screen then ignore.)  It is called with	; (if we're not on a VGA screen then ignore.)
24	; SI and DX:AX set by routine searchdir	; The font is on top of the getc stack.
25	;	;
26		loadfont.err: jmp close ; Tailcall the close routine
27
28	loadfont:	loadfont:
29	mov bx,trackbuf ; The trackbuf is >= 16K; the part	mov di,trackbuf
30	mov cx,[BufSafe] ; of a PSF file we care about is no	mov cx,4
31	call getfssec ; more than 8K+4 bytes	call readc ; Read header
32		jc .err
33
34	mov ax,[trackbuf] ; Magic number	mov ax,[trackbuf] ; Magic number
35	cmp ax,0436h	cmp ax,0436h
36	jne lf_ret	jne .err
37
38	mov al,[trackbuf+2] ; File mode	mov al,[trackbuf+2] ; File mode
39	cmp al,5 ; Font modes 0-5 supported	cmp al,5 ; Font modes 0-5 supported
40	ja lf_ret	ja .err
41
42	mov bh,byte [trackbuf+3] ; Height of font	xor bx,bx
43		mov bh,[trackbuf+3] ; Height of font
44	cmp bh,2 ; VGA minimum	cmp bh,2 ; VGA minimum
45	jb lf_ret	jb .err
46	cmp bh,32 ; VGA maximum	cmp bh,32 ; VGA maximum
47	ja lf_ret	ja .err
48
49		; Load the actual font
50		mov di,trackbuf
51		mov cx,bx ; Bytes = font height * 256
52		call readc
53		jc .err
54
55		call close
56
57	; Copy to font buffer	; Copy to font buffer
58	mov si,trackbuf+4 ; Start of font data	mov si,trackbuf ; Start of font data
59	mov [VGAFontSize],bh	mov [VGAFontSize],bh
60	mov di,vgafontbuf	push es
61	mov cx,(32*256) >> 2 ; Maximum size	mov cx,aux_seg
62		mov es,cx
63		mov di,aux.fontbuf
64		mov cx,bx
65		shr cx,2
66	rep movsd	rep movsd
67		pop es
68
69	mov [UserFont], byte 1 ; Set font flag	mov [UserFont], byte 1 ; Set font flag
70
	; Fall through to use_font
71	;	;
72	; use_font:	; use_font:
73	; This routine activates whatever font happens to be in the	; This routine activates whatever font happens to be in the
74	; vgafontbuf, and updates the adjust_screen data.	; vgafontbuf, and updates the adjust_screen data.
75	;       Must be called with CS = DS = ES	;       Must be called with CS = DS
76	;	;
77	use_font:	use_font:
78		test byte [UsingVGA], ~03h ; Nonstandard mode?
79		jz .modeok
80		call vgaclearmode
81
82		.modeok:
83	test [UserFont], byte 1 ; Are we using a user-specified font?	test [UserFont], byte 1 ; Are we using a user-specified font?
84	jz adjust_screen ; If not, just do the normal stuff	jz adjust_screen ; If not, just do the normal stuff
85
86	mov bp,vgafontbuf	push es
87	mov bh,[VGAFontSize]	mov bp,aux_seg
88		mov es,bp
89
90		mov bp,aux.fontbuf ; ES:BP -> font
91		mov bh,[VGAFontSize]
92	xor bl,bl ; Needed by both INT 10h calls	xor bl,bl ; Needed by both INT 10h calls
93	cmp [UsingVGA], byte 1 ; Are we in graphics mode?
94	jne .text	test byte [UsingVGA], 01h ; Are we in graphics mode?
95		jz .text
96
97	.graphics:	.graphics:
98	xor cx,cx	xor cx,cx
99	mov cl,bh ; CX = bytes/character	mov cl,bh ; CX = bytes/character
100	mov ax,480	mov ax,[GXPixRows]
101	div cl ; Compute char rows per screen	div cl ; Compute char rows per screen
102	mov dl,al	mov dl,al
103	dec al	dec ax
104	mov [VidRows],al	mov [VidRows],al
105	mov ax,1121h ; Set user character table	mov ax,1121h ; Set user character table
106	int 10h	int 10h
107	mov [VidCols], byte 79 ; Always 80 bytes/line	mov ax,[GXPixCols]
108	.lf_ret: ret ; No need to call adjust_screen	shr ax,3 ; 8 pixels/character
109		dec ax
110		mov [VidCols],al
111		pop es
112		ret ; No need to call adjust_screen
113
114	.text:	.text:
115	mov cx,256	mov cx,256
116	xor dx,dx	xor dx,dx
117	mov ax,1110h	mov ax,1110h
118	int 10h ; Load into VGA RAM	int 10h ; Load into VGA RAM
119		pop es
120
121	xor bl,bl	xor bl,bl
122	mov ax,1103h ; Select page 0	mov ax,1103h ; Select page 0
123	int 10h	int 10h
124
	; Fall through to adjust_screen
	lf_ret equ use_font.lf_ret
125	;	;
126	; adjust_screen: Set the internal variables associated with the screen size.	; adjust_screen: Set the internal variables associated with the screen size.
127	; This is a subroutine in case we're loading a custom font.	; This is a subroutine in case we're loading a custom font.
#	Line 117  vidrows_ok: mov [VidRows],al	Line 141  vidrows_ok: mov [VidRows],al
141	popa	popa
142	ret	ret
143
	; VGA font buffer at the end of memory (so loading a font works even
	; in graphics mode, but don't put too much pressure on the .bss)
	section .latebss
	vgafontbuf resb 8192
144	section .data	section .data
145	align 2, db 0	alignz 2
146	VGAFontSize dw 16 ; Defaults to 16 byte font	VGAFontSize dw 16 ; Defaults to 16 byte font
147	UserFont db 0 ; Using a user-specified font	UserFont db 0 ; Using a user-specified font
148
149		section .bss1
150		alignb 4
151		GXPixCols resw 1 ; Graphics mode pixel columns
152		GXPixRows resw 1 ; Graphics mode pixel rows

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