linux/drivers/video/fbdev/core/cfbcopyarea.c

/*
 *  Generic function for frame buffer with packed pixels of any depth.
 *
 *      Copyright (C)  1999-2005 James Simmons <[email protected]>
 *
 *  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.
 *
 * NOTES:
 *
 *  This is for cfb packed pixels. Iplan and such are incorporated in the
 *  drivers that need them.
 *
 *  FIXME
 *
 *  Also need to add code to deal with cards endians that are different than
 *  the native cpu endians. I also need to deal with MSB position in the word.
 *
 *  The two functions or copying forward and backward could be split up like
 *  the ones for filling, i.e. in aligned and unaligned versions. This would
 *  help moving some redundant computations and branches out of the loop, too.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <asm/types.h>
#include <asm/io.h>
#include "fb_draw.h"

#if BITS_PER_LONG == 32
#define FB_WRITEL …
#define FB_READL …
#else
#define FB_WRITEL …
#define FB_READL …
#endif

    /*
     *  Generic bitwise copy algorithm
     */

static void
bitcpy(struct fb_info *p, unsigned long __iomem *dst, unsigned dst_idx,
		const unsigned long __iomem *src, unsigned src_idx, int bits,
		unsigned n, u32 bswapmask)
{ … }

    /*
     *  Generic bitwise copy algorithm, operating backward
     */

static void
bitcpy_rev(struct fb_info *p, unsigned long __iomem *dst, unsigned dst_idx,
		const unsigned long __iomem *src, unsigned src_idx, int bits,
		unsigned n, u32 bswapmask)
{ … }

void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
{ … }

EXPORT_SYMBOL(…);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;