2 * linux/drivers/video/cfb2.c -- Low level frame buffer operations for 2 bpp
5 * Created 26 Dec 1997 by Michael Schmitz
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
13 #include <linux/module.h>
14 #include <linux/tty.h>
15 #include <linux/console.h>
16 #include <linux/string.h>
19 #include <video/fbcon.h>
20 #include <video/fbcon-cfb2.h>
28 * IFF the font is even pixel aligned (that is to say each
29 * character start is a byte start in the pixel pairs). That
30 * avoids us having to mask bytes and means we won't be here
31 * all week. On a MacII that matters _lots_
34 static u_char nibbletab_cfb2[]={
35 #if defined(__BIG_ENDIAN)
40 #elif defined(__LITTLE_ENDIAN)
46 #error FIXME: No endianness??
51 void fbcon_cfb2_setup(struct display *p)
53 p->next_line = p->line_length ? p->line_length : p->var.xres_virtual>>2;
57 void fbcon_cfb2_bmove(struct display *p, int sy, int sx, int dy, int dx,
58 int height, int width)
60 int bytes = p->next_line, linesize = bytes * fontheight(p), rows;
63 if (sx == 0 && dx == 0 && width * 2 == bytes) {
64 fb_memmove(p->screen_base + dy * linesize,
65 p->screen_base + sy * linesize,
69 if (dy < sy || (dy == sy && dx < sx)) {
70 src = p->screen_base + sy * linesize + sx * 2;
71 dst = p->screen_base + dy * linesize + dx * 2;
72 for (rows = height * fontheight(p) ; rows-- ;) {
73 fb_memmove(dst, src, width * 2);
79 src = p->screen_base + (sy+height) * linesize + sx * 2
81 dst = p->screen_base + (dy+height) * linesize + dx * 2
83 for (rows = height * fontheight(p) ; rows-- ;) {
84 fb_memmove(dst, src, width * 2);
92 void fbcon_cfb2_clear(struct vc_data *conp, struct display *p, int sy, int sx,
93 int height, int width)
96 int bytes=p->next_line,lines=height * fontheight(p), rows, i;
99 dest = p->screen_base + sy * fontheight(p) * bytes + sx * 2;
101 bgx=attr_bgcol_ec(p,conp);
102 bgx |= (bgx << 2); /* expand the colour to 16 bits */
106 if (sx == 0 && width * 2 == bytes) {
107 for (i = 0 ; i < lines * width ; i++) {
108 fb_writew (bgx, dest);
113 for (rows = lines; rows-- ; dest0 += bytes) {
115 for (i = 0 ; i < width ; i++) {
117 fb_writew (bgx, dest);
124 void fbcon_cfb2_putc(struct vc_data *conp, struct display *p, int c, int yy,
128 int bytes=p->next_line,rows;
131 dest = p->screen_base + yy * fontheight(p) * bytes + xx * 2;
132 cdat = p->fontdata + (c & p->charmask) * fontheight(p);
134 fgx=3;/*attr_fgcol(p,c);*/
136 fgx |= (fgx << 2); /* expand color to 8 bits */
142 for (rows = fontheight(p) ; rows-- ; dest += bytes) {
143 fb_writeb((nibbletab_cfb2[*cdat >> 4] & eorx) ^ bgx, dest+0);
144 fb_writeb((nibbletab_cfb2[*cdat++ & 0xf] & eorx) ^ bgx, dest+1);
148 void fbcon_cfb2_putcs(struct vc_data *conp, struct display *p, const unsigned short *s,
149 int count, int yy, int xx)
151 u8 *cdat, *dest, *dest0;
153 int rows,bytes=p->next_line;
156 dest0 = p->screen_base + yy * fontheight(p) * bytes + xx * 2;
158 fgx = 3/*attr_fgcol(p, c)*/;
159 bgx = attr_bgcol(p, c);
166 c = scr_readw(s++) & p->charmask;
167 cdat = p->fontdata + c * fontheight(p);
169 for (rows = fontheight(p), dest = dest0; rows-- ; dest += bytes) {
170 fb_writeb((nibbletab_cfb2[*cdat >> 4] & eorx) ^ bgx, dest+0);
171 fb_writeb((nibbletab_cfb2[*cdat++ & 0xf] & eorx) ^ bgx, dest+1);
177 void fbcon_cfb2_revc(struct display *p, int xx, int yy)
180 int bytes=p->next_line, rows;
182 dest = p->screen_base + yy * fontheight(p) * bytes + xx * 2;
183 for (rows = fontheight(p) ; rows-- ; dest += bytes) {
184 fb_writew(fb_readw(dest) ^ 0xffff, dest);
190 * `switch' for the low level operations
193 struct display_switch fbcon_cfb2 = {
194 setup: fbcon_cfb2_setup,
195 bmove: fbcon_cfb2_bmove,
196 clear: fbcon_cfb2_clear,
197 putc: fbcon_cfb2_putc,
198 putcs: fbcon_cfb2_putcs,
199 revc: fbcon_cfb2_revc,
200 fontwidthmask: FONTWIDTH(8)
205 MODULE_LICENSE("GPL");
207 int init_module(void)
212 void cleanup_module(void)
218 * Visible symbols for modules
221 EXPORT_SYMBOL(fbcon_cfb2);
222 EXPORT_SYMBOL(fbcon_cfb2_setup);
223 EXPORT_SYMBOL(fbcon_cfb2_bmove);
224 EXPORT_SYMBOL(fbcon_cfb2_clear);
225 EXPORT_SYMBOL(fbcon_cfb2_putc);
226 EXPORT_SYMBOL(fbcon_cfb2_putcs);
227 EXPORT_SYMBOL(fbcon_cfb2_revc);