text: /*
   *  linux/drivers/video/iplan2p8.c -- Low level frame buffer operations for
   *				      interleaved bitplanes à la Atari (8
   *				      planes, 2 bytes interleave)
   *
   *	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/string.h>
  #include <linux/fb.h>
  
  #include <asm/setup.h>
  
  #include "atafb.h"
  
  #define BPL	8
  #include "atafb_utils.h"
  
  
  /* Copies a 8 plane column from 's', height 'h', to 'd'. */
  
  /* This expands a 8 bit color into two longs for two movepl (8 plane)
   * operations.
   */
  
  void atafb_iplan2p8_copyarea(struct fb_info *info, u_long next_line,
  			     int sy, int sx, int dy, int dx,
  			     int height, int width)
  {
  	/*  bmove() has to distinguish two major cases: If both, source and
  	 *  destination, start at even addresses or both are at odd
  	 *  addresses, just the first odd and last even column (if present)
  	 *  require special treatment (memmove_col()). The rest between
  	 *  then can be copied by normal operations, because all adjacent
  	 *  bytes are affected and are to be stored in the same order.
  	 *    The pathological case is when the move should go from an odd
  	 *  address to an even or vice versa. Since the bytes in the plane
  	 *  words must be assembled in new order, it seems wisest to make
  	 *  all movements by memmove_col().
  	 */
  
  	u8 *src, *dst;
  	u32 *s, *d;
  	int w, l , i, j;
  	u_int colsize;
  	u_int upwards = (dy < sy) || (dy == sy && dx < sx);
  
  	colsize = height;
  	if (!((sx ^ dx) & 15)) {
  		/* odd->odd or even->even */
  
  		if (upwards) {
  			src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
  			dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
  			if (sx & 15) {
  				memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
  				src += BPL * 2;
  				dst += BPL * 2;
  				width -= 8;
  			}
  			w = width >> 4;
  			if (w) {
  				s = (u32 *)src;
  				d = (u32 *)dst;
  				w *= BPL / 2;
  				l = next_line - w * 4;
  				for (j = height; j > 0; j--) {
  					for (i = w; i > 0; i--)
  						*d++ = *s++;
  					s = (u32 *)((u8 *)s + l);
  					d = (u32 *)((u8 *)d + l);
  				}
  			}
  			if (width & 15)
  				memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
  					      0xff00ff00, height, next_line - BPL * 2);
  		} else {
  			src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
  			dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
  
  			if ((sx + width) & 15) {
  				src -= BPL * 2;
  				dst -= BPL * 2;
  				memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
  				width -= 8;
  			}
  			w = width >> 4;
  			if (w) {
  				s = (u32 *)src;
  				d = (u32 *)dst;
  				w *= BPL / 2;
  				l = next_line - w * 4;
  				for (j = height; j > 0; j--) {
  					for (i = w; i > 0; i--)
  						*--d = *--s;
  					s = (u32 *)((u8 *)s - l);
  					d = (u32 *)((u8 *)d - l);
  				}
  			}
  			if (sx & 15)
  				memmove32_col(dst - (width - 16) / (8 / BPL),
  					      src - (width - 16) / (8 / BPL),
  					      0xff00ff, colsize, -next_line - BPL * 2);
  		}
  	} else {
  		/* odd->even or even->odd */
  		if (upwards) {
  			u32 *src32, *dst32;
  			u32 pval[4], v, v1, mask;
  			int i, j, w, f;
  
  			src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
  			dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
  
  			mask = 0xff00ff00;
  			f = 0;
  			w = width;
  			if (sx & 15) {
  				f = 1;
  				w += 8;
  			}
  			if ((sx + width) & 15)
  				f |= 2;
  			w >>= 4;
  			for (i = height; i; i--) {
  				src32 = (u32 *)src;
  				dst32 = (u32 *)dst;
  
  				if (f & 1) {
  					pval[0] = (*src32++ << 8) & mask;
  					pval[1] = (*src32++ << 8) & mask;
  					pval[2] = (*src32++ << 8) & mask;
  					pval[3] = (*src32++ << 8) & mask;
  				} else {
  					pval[0] = dst32[0] & mask;
  					pval[1] = dst32[1] & mask;
  					pval[2] = dst32[2] & mask;
  					pval[3] = dst32[3] & mask;
  				}
  
  				for (j = w; j > 0; j--) {
  					v = *src32++;
  					v1 = v & mask;
  					*dst32++ = pval[0] | (v1 >> 8);
  					pval[0] = (v ^ v1) << 8;
  					v = *src32++;
  					v1 = v & mask;
  					*dst32++ = pval[1] | (v1 >> 8);
  					pval[1] = (v ^ v1) << 8;
  					v = *src32++;
  					v1 = v & mask;
  					*dst32++ = pval[2] | (v1 >> 8);
  					pval[2] = (v ^ v1) << 8;
  					v = *src32++;
  					v1 = v & mask;
  					*dst32++ = pval[3] | (v1 >> 8);
  					pval[3] = (v ^ v1) << 8;
  				}
  
  				if (f & 2) {
  					dst32[0] = (dst32[0] & mask) | pval[0];
  					dst32[1] = (dst32[1] & mask) | pval[1];
  					dst32[2] = (dst32[2] & mask) | pval[2];
  					dst32[3] = (dst32[3] & mask) | pval[3];
  				}
  
  				src += next_line;
  				dst += next_line;
  			}
  		} else {
  			u32 *src32, *dst32;
  			u32 pval[4], v, v1, mask;
  			int i, j, w, f;
  
  			src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
  			dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
  
  			mask = 0xff00ff;
  			f = 0;
  			w = width;
  			if ((dx + width) & 15)
  				f = 1;
  			if (sx & 15) {
  				f |= 2;
  				w += 8;
  			}
  			w >>= 4;
  			for (i = height; i; i--) {
  				src32 = (u32 *)src;
  				dst32 = (u32 *)dst;
  
  				if (f & 1) {
  					pval[0] = dst32[-1] & mask;
  					pval[1] = dst32[-2] & mask;
  					pval[2] = dst32[-3] & mask;
  					pval[3] = dst32[-4] & mask;
  				} else {
  					pval[0] = (*--src32 >> 8) & mask;
  					pval[1] = (*--src32 >> 8) & mask;
  					pval[2] = (*--src32 >> 8) & mask;
  					pval[3] = (*--src32 >> 8) & mask;
  				}
  
  				for (j = w; j > 0; j--) {
  					v = *--src32;
  					v1 = v & mask;
  					*--dst32 = pval[0] | (v1 << 8);
  					pval[0] = (v ^ v1) >> 8;
  					v = *--src32;
  					v1 = v & mask;
  					*--dst32 = pval[1] | (v1 << 8);
  					pval[1] = (v ^ v1) >> 8;
  					v = *--src32;
  					v1 = v & mask;
  					*--dst32 = pval[2] | (v1 << 8);
  					pval[2] = (v ^ v1) >> 8;
  					v = *--src32;
  					v1 = v & mask;
  					*--dst32 = pval[3] | (v1 << 8);
  					pval[3] = (v ^ v1) >> 8;
  				}
  
  				if (!(f & 2)) {
  					dst32[-1] = (dst32[-1] & mask) | pval[0];
  					dst32[-2] = (dst32[-2] & mask) | pval[1];
  					dst32[-3] = (dst32[-3] & mask) | pval[2];
  					dst32[-4] = (dst32[-4] & mask) | pval[3];
  				}
  
  				src -= next_line;
  				dst -= next_line;
  			}
  		}
  	}
  }
  
  void atafb_iplan2p8_fillrect(struct fb_info *info, u_long next_line, u32 color,
                               int sy, int sx, int height, int width)
  {
  	u32 *dest;
  	int rows, i;
  	u32 cval[4];
  
  	dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
  	if (sx & 15) {
  		u8 *dest8 = (u8 *)dest + 1;
  
  		expand8_col2mask(color, cval);
  
  		for (i = height; i; i--) {
  			fill8_col(dest8, cval);
  			dest8 += next_line;
  		}
  		dest += BPL / 2;
  		width -= 8;
  	}
  
  	expand16_col2mask(color, cval);
  	rows = width >> 4;
  	if (rows) {
  		u32 *d = dest;
  		u32 off = next_line - rows * BPL * 2;
  		for (i = height; i; i--) {
  			d = fill16_col(d, rows, cval);
  			d = (u32 *)((long)d + off);
  		}
  		dest += rows * BPL / 2;
  		width &= 15;
  	}
  
  	if (width) {
  		u8 *dest8 = (u8 *)dest;
  
  		expand8_col2mask(color, cval);
  
  		for (i = height; i; i--) {
  			fill8_col(dest8, cval);
  			dest8 += next_line;
  		}
  	}
  }
  
  void atafb_iplan2p8_linefill(struct fb_info *info, u_long next_line,
  			     int dy, int dx, u32 width,
  			     const u8 *data, u32 bgcolor, u32 fgcolor)
  {
  	u32 *dest;
  	const u16 *data16;
  	int rows;
  	u32 fgm[4], bgm[4], m;
  
  	dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
  	if (dx & 15) {
  		fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
  		dest += BPL / 2;
  		width -= 8;
  	}
  
  	if (width >= 16) {
  		data16 = (const u16 *)data;
  		expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
  
  		for (rows = width / 16; rows; rows--) {
  			u16 d = *data16++;
  			m = d | ((u32)d << 16);
  			*dest++ = (m & fgm[0]) ^ bgm[0];
  			*dest++ = (m & fgm[1]) ^ bgm[1];
  			*dest++ = (m & fgm[2]) ^ bgm[2];
  			*dest++ = (m & fgm[3]) ^ bgm[3];
  		}
  
  		data = (const u8 *)data16;
  		width &= 15;
  	}
  
  	if (width)
  		fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
  }
  
  #ifdef MODULE
  MODULE_LICENSE("GPL");
  
  int init_module(void)
  {
  	return 0;
  }
  
  void cleanup_module(void)
  {
  }
  #endif /* MODULE */
  
  
      /*
       *  Visible symbols for modules
       */
  
  EXPORT_SYMBOL(atafb_iplan2p8_copyarea);
  EXPORT_SYMBOL(atafb_iplan2p8_fillrect);
  EXPORT_SYMBOL(atafb_iplan2p8_linefill);
  