fbcon-cfb8.c
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上传日期:2013-04-10
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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 <video/fbcon.h>
- #include <video/fbcon-cfb8.h>
- /*
- * 8 bpp packed pixels
- */
- static u32 nibbletab_cfb8[] = {
- #if defined(__BIG_ENDIAN)
- 0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
- 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
- 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
- 0xffff0000,0xffff00ff,0xffffff00,0xffffffff
- #elif defined(__LITTLE_ENDIAN)
- 0x00000000,0xff000000,0x00ff0000,0xffff0000,
- 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
- 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
- 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
- #else
- #error FIXME: No endianness??
- #endif
- };
- void fbcon_cfb8_setup(struct display *p)
- {
- p->next_line = p->line_length ? p->line_length : p->var.xres_virtual;
- p->next_plane = 0;
- }
- void fbcon_cfb8_bmove(struct display *p, int sy, int sx, int dy, int dx,
- int height, int width)
- {
- int bytes = p->next_line, linesize = bytes * fontheight(p), rows;
- u8 *src,*dst;
- if (sx == 0 && dx == 0 && width * fontwidth(p) == bytes) {
- fb_memmove(p->screen_base + dy * linesize,
- p->screen_base + sy * linesize,
- height * linesize);
- return;
- }
- if (fontwidthlog(p)) {
- sx <<= fontwidthlog(p); dx <<= fontwidthlog(p); width <<= fontwidthlog(p);
- } else {
- sx *= fontwidth(p); dx *= fontwidth(p); width *= fontwidth(p);
- }
- if (dy < sy || (dy == sy && dx < sx)) {
- src = p->screen_base + sy * linesize + sx;
- dst = p->screen_base + dy * linesize + dx;
- for (rows = height * fontheight(p) ; rows-- ;) {
- fb_memmove(dst, src, width);
- src += bytes;
- dst += bytes;
- }
- } else {
- src = p->screen_base + (sy+height) * linesize + sx - bytes;
- dst = p->screen_base + (dy+height) * linesize + dx - bytes;
- for (rows = height * fontheight(p) ; rows-- ;) {
- fb_memmove(dst, src, width);
- src -= bytes;
- dst -= bytes;
- }
- }
- }
- static inline void rectfill(u8 *dest, int width, int height, u8 data,
- int linesize)
- {
- while (height-- > 0) {
- fb_memset(dest, data, width);
- dest += linesize;
- }
- }
- void fbcon_cfb8_clear(struct vc_data *conp, struct display *p, int sy, int sx,
- int height, int width)
- {
- u8 *dest;
- int bytes=p->next_line,lines=height * fontheight(p);
- u8 bgx;
- dest = p->screen_base + sy * fontheight(p) * bytes + sx * fontwidth(p);
- bgx=attr_bgcol_ec(p,conp);
- width *= fontwidth(p);
- if (width == bytes)
- rectfill(dest, lines * width, 1, bgx, bytes);
- else
- rectfill(dest, width, lines, bgx, bytes);
- }
- void fbcon_cfb8_putc(struct vc_data *conp, struct display *p, int c, int yy,
- int xx)
- {
- u8 *dest,*cdat;
- int bytes=p->next_line,rows;
- u32 eorx,fgx,bgx;
- dest = p->screen_base + yy * fontheight(p) * bytes + xx * fontwidth(p);
- if (fontwidth(p) <= 8)
- cdat = p->fontdata + (c & p->charmask) * fontheight(p);
- else
- cdat = p->fontdata + ((c & p->charmask) * fontheight(p) << 1);
- fgx=attr_fgcol(p,c);
- bgx=attr_bgcol(p,c);
- fgx |= (fgx << 8);
- fgx |= (fgx << 16);
- bgx |= (bgx << 8);
- bgx |= (bgx << 16);
- eorx = fgx ^ bgx;
- switch (fontwidth(p)) {
- case 4:
- for (rows = fontheight(p) ; rows-- ; dest += bytes)
- fb_writel((nibbletab_cfb8[*cdat++ >> 4] & eorx) ^ bgx, dest);
- break;
- case 8:
- for (rows = fontheight(p) ; rows-- ; dest += bytes) {
- fb_writel((nibbletab_cfb8[*cdat >> 4] & eorx) ^ bgx, dest);
- fb_writel((nibbletab_cfb8[*cdat++ & 0xf] & eorx) ^ bgx, dest+4);
- }
- break;
- case 12:
- case 16:
- for (rows = fontheight(p) ; rows-- ; dest += bytes) {
- fb_writel((nibbletab_cfb8[*cdat >> 4] & eorx) ^ bgx, dest);
- fb_writel((nibbletab_cfb8[*cdat++ & 0xf] & eorx) ^ bgx, dest+4);
- fb_writel((nibbletab_cfb8[(*cdat >> 4) & 0xf] & eorx) ^ bgx, dest+8);
- if (fontwidth(p) == 16)
- fb_writel((nibbletab_cfb8[*cdat & 0xf] & eorx) ^ bgx, dest+12);
- cdat++;
- }
- break;
- }
- }
- void fbcon_cfb8_putcs(struct vc_data *conp, struct display *p,
- const unsigned short *s, int count, int yy, int xx)
- {
- u8 *cdat, *dest, *dest0;
- u16 c;
- int rows,bytes=p->next_line;
- u32 eorx, fgx, bgx;
- dest0 = p->screen_base + yy * fontheight(p) * bytes + xx * fontwidth(p);
- c = scr_readw(s);
- fgx = attr_fgcol(p, c);
- bgx = attr_bgcol(p, c);
- fgx |= (fgx << 8);
- fgx |= (fgx << 16);
- bgx |= (bgx << 8);
- bgx |= (bgx << 16);
- eorx = fgx ^ bgx;
- switch (fontwidth(p)) {
- case 4:
- while (count--) {
- c = scr_readw(s++) & p->charmask;
- cdat = p->fontdata + c * fontheight(p);
- for (rows = fontheight(p), dest = dest0; rows-- ; dest += bytes)
- fb_writel((nibbletab_cfb8[*cdat++ >> 4] & eorx) ^ bgx, dest);
- dest0+=4;
- }
- break;
- case 8:
- while (count--) {
- c = scr_readw(s++) & p->charmask;
- cdat = p->fontdata + c * fontheight(p);
- for (rows = fontheight(p), dest = dest0; rows-- ; dest += bytes) {
- fb_writel((nibbletab_cfb8[*cdat >> 4] & eorx) ^ bgx, dest);
- fb_writel((nibbletab_cfb8[*cdat++ & 0xf] & eorx) ^ bgx, dest+4);
- }
- dest0+=8;
- }
- break;
- case 12:
- case 16:
- while (count--) {
- c = scr_readw(s++) & p->charmask;
- cdat = p->fontdata + (c * fontheight(p) << 1);
- for (rows = fontheight(p), dest = dest0; rows-- ; dest += bytes) {
- fb_writel((nibbletab_cfb8[*cdat >> 4] & eorx) ^ bgx, dest);
- fb_writel((nibbletab_cfb8[*cdat++ & 0xf] & eorx) ^ bgx, dest+4);
- fb_writel((nibbletab_cfb8[(*cdat >> 4) & 0xf] & eorx) ^ bgx, dest+8);
- if (fontwidth(p) == 16)
- fb_writel((nibbletab_cfb8[*cdat & 0xf] & eorx) ^ bgx, dest+12);
- cdat++;
- }
- dest0+=fontwidth(p);
- }
- break;
- }
- }
- void fbcon_cfb8_revc(struct display *p, int xx, int yy)
- {
- u8 *dest;
- int bytes=p->next_line, rows;
- dest = p->screen_base + yy * fontheight(p) * bytes + xx * fontwidth(p);
- for (rows = fontheight(p) ; rows-- ; dest += bytes) {
- switch (fontwidth(p)) {
- case 16: fb_writel(fb_readl(dest+12) ^ 0x0f0f0f0f, dest+12); /* fall thru */
- case 12: fb_writel(fb_readl(dest+8) ^ 0x0f0f0f0f, dest+8); /* fall thru */
- case 8: fb_writel(fb_readl(dest+4) ^ 0x0f0f0f0f, dest+4); /* fall thru */
- case 4: fb_writel(fb_readl(dest) ^ 0x0f0f0f0f, dest); /* fall thru */
- default: break;
- }
- }
- }
- void fbcon_cfb8_clear_margins(struct vc_data *conp, struct display *p,
- int bottom_only)
- {
- int bytes=p->next_line;
- u8 bgx;
- unsigned int right_start = conp->vc_cols*fontwidth(p);
- unsigned int bottom_start = conp->vc_rows*fontheight(p);
- unsigned int right_width, bottom_width;
- bgx=attr_bgcol_ec(p,conp);
- if (!bottom_only && (right_width = p->var.xres-right_start))
- rectfill(p->screen_base+right_start, right_width, p->var.yres_virtual,
- bgx, bytes);
- if ((bottom_width = p->var.yres-bottom_start))
- rectfill(p->screen_base+(p->var.yoffset+bottom_start)*bytes,
- right_start, bottom_width, bgx, bytes);
- }
- /*
- * `switch' for the low level operations
- */
- struct display_switch fbcon_cfb8 = {
- setup: fbcon_cfb8_setup,
- bmove: fbcon_cfb8_bmove,
- clear: fbcon_cfb8_clear,
- putc: fbcon_cfb8_putc,
- putcs: fbcon_cfb8_putcs,
- revc: fbcon_cfb8_revc,
- clear_margins: fbcon_cfb8_clear_margins,
- fontwidthmask: FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
- };
- #ifdef MODULE
- MODULE_LICENSE("GPL");
- int init_module(void)
- {
- return 0;
- }
- void cleanup_module(void)
- {}
- #endif /* MODULE */
- /*
- * Visible symbols for modules
- */
- EXPORT_SYMBOL(fbcon_cfb8);
- EXPORT_SYMBOL(fbcon_cfb8_setup);
- EXPORT_SYMBOL(fbcon_cfb8_bmove);
- EXPORT_SYMBOL(fbcon_cfb8_clear);
- EXPORT_SYMBOL(fbcon_cfb8_putc);
- EXPORT_SYMBOL(fbcon_cfb8_putcs);
- EXPORT_SYMBOL(fbcon_cfb8_revc);
- EXPORT_SYMBOL(fbcon_cfb8_clear_margins);