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/*
* linux/drivers/video/cfb8.c -- Low level frame buffer operations for 8 bpp
* packed pixels
*
* Created 5 Apr 1997 by Geert Uytterhoeven
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/fb.h>
#include "fbcon.h"
/*
* Prototypes
*/
static int open_cfb8(struct display *p);
static void release_cfb8(void);
static void bmove_cfb8(struct display *p, int sy, int sx, int dy, int dx,
int height, int width);
static void clear_cfb8(struct vc_data *conp, struct display *p, int sy,
int sx, int height, int width);
static void putc_cfb8(struct vc_data *conp, struct display *p, int c, int yy,
int xx);
static void putcs_cfb8(struct vc_data *conp, struct display *p,
const char *s, int count, int yy, int xx);
static void rev_char_cfb8(struct display *p, int xx, int yy);
/*
* `switch' for the low level operations
*/
static struct display_switch dispsw_cfb8 = {
open_cfb8, release_cfb8, bmove_cfb8, clear_cfb8, putc_cfb8, putcs_cfb8,
rev_char_cfb8
};
/*
* 8 bpp packed pixels
*/
static u_long nibbletab_cfb8[] = {
0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
0xffff0000,0xffff00ff,0xffffff00,0xffffffff
};
static int open_cfb8(struct display *p)
{
if (p->type != FB_TYPE_PACKED_PIXELS || p->var.bits_per_pixel != 8)
return -EINVAL;
p->next_line = p->var.xres_virtual;
p->next_plane = 0;
MOD_INC_USE_COUNT;
return 0;
}
static void release_cfb8(void)
{
MOD_DEC_USE_COUNT;
}
static void bmove_cfb8(struct display *p, int sy, int sx, int dy, int dx,
int height, int width)
{
int bytes = p->next_line, linesize = bytes * p->fontheight, rows;
u_char *src,*dst;
if (sx == 0 && dx == 0 && width * 8 == bytes)
mymemmove(p->screen_base + dy * linesize,
p->screen_base + sy * linesize,
height * linesize);
else if (dy < sy || (dy == sy && dx < sx)) {
src = p->screen_base + sy * linesize + sx * 8;
dst = p->screen_base + dy * linesize + dx * 8;
for (rows = height * p->fontheight ; rows-- ;) {
mymemmove(dst, src, width * 8);
src += bytes;
dst += bytes;
}
} else {
src = p->screen_base + (sy+height) * linesize + sx * 8 - bytes;
dst = p->screen_base + (dy+height) * linesize + dx * 8 - bytes;
for (rows = height * p->fontheight ; rows-- ;) {
mymemmove(dst, src, width * 8);
src -= bytes;
dst -= bytes;
}
}
}
static void clear_cfb8(struct vc_data *conp, struct display *p, int sy, int sx,
int height, int width)
{
u_char *dest0,*dest;
int bytes=p->next_line,lines=height * p->fontheight, rows, i;
u_long bgx;
dest = p->screen_base + sy * p->fontheight * bytes + sx * 8;
bgx=attr_bgcol_ec(p,conp);
bgx |= (bgx << 8);
bgx |= (bgx << 16);
if (sx == 0 && width * 8 == bytes)
for (i = 0 ; i < lines * width ; i++) {
((u_long *)dest)[0]=bgx;
((u_long *)dest)[1]=bgx;
dest+=8;
}
else {
dest0=dest;
for (rows = lines; rows-- ; dest0 += bytes) {
dest=dest0;
for (i = 0 ; i < width ; i++) {
((u_long *)dest)[0]=bgx;
((u_long *)dest)[1]=bgx;
dest+=8;
}
}
}
}
static void putc_cfb8(struct vc_data *conp, struct display *p, int c, int yy,
int xx)
{
u_char *dest,*cdat;
int bytes=p->next_line,rows;
ulong eorx,fgx,bgx;
c &= 0xff;
dest = p->screen_base + yy * p->fontheight * bytes + xx * 8;
cdat = p->fontdata + c * p->fontheight;
fgx=attr_fgcol(p,conp);
bgx=attr_bgcol(p,conp);
fgx |= (fgx << 8);
fgx |= (fgx << 16);
bgx |= (bgx << 8);
bgx |= (bgx << 16);
eorx = fgx ^ bgx;
for (rows = p->fontheight ; rows-- ; dest += bytes) {
((u_long *)dest)[0]= (nibbletab_cfb8[*cdat >> 4] & eorx) ^ bgx;
((u_long *)dest)[1]= (nibbletab_cfb8[*cdat++ & 0xf] & eorx) ^ bgx;
}
}
static void putcs_cfb8(struct vc_data *conp, struct display *p, const char *s,
int count, int yy, int xx)
{
u_char *cdat, c, *dest, *dest0;
int rows,bytes=p->next_line;
u_long eorx, fgx, bgx;
dest0 = p->screen_base + yy * p->fontheight * bytes + xx * 8;
fgx=attr_fgcol(p,conp);
bgx=attr_bgcol(p,conp);
fgx |= (fgx << 8);
fgx |= (fgx << 16);
bgx |= (bgx << 8);
bgx |= (bgx << 16);
eorx = fgx ^ bgx;
while (count--) {
c = *s++;
cdat = p->fontdata + c * p->fontheight;
for (rows = p->fontheight, dest = dest0; rows-- ; dest += bytes) {
((u_long *)dest)[0]= (nibbletab_cfb8[*cdat >> 4] & eorx) ^ bgx;
((u_long *)dest)[1]= (nibbletab_cfb8[*cdat++ & 0xf] & eorx) ^
bgx;
}
dest0+=8;
}
}
static void rev_char_cfb8(struct display *p, int xx, int yy)
{
u_char *dest;
int bytes=p->next_line, rows;
dest = p->screen_base + yy * p->fontheight * bytes + xx * 8;
for (rows = p->fontheight ; rows-- ; dest += bytes) {
((u_long *)dest)[0] ^= 0x0f0f0f0f;
((u_long *)dest)[1] ^= 0x0f0f0f0f;
}
}
#ifdef MODULE
int init_module(void)
#else
int fbcon_init_cfb8(void)
#endif
{
return(fbcon_register_driver(&dispsw_cfb8, 0));
}
#ifdef MODULE
void cleanup_module(void)
{
fbcon_unregister_driver(&dispsw_cfb8);
}
#endif /* MODULE */
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