Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 441 insertions, 0 deletions

diff --git a/drivers/video/cfbcopyarea.c b/drivers/video/cfbcopyarea.c
new file mode 100644
index 0000000..67711f7
--- /dev/null
+++ b/drivers/video/cfbcopyarea.c
@@ -0,0 +1,441 @@
+/*
+ *  Generic function for frame buffer with packed pixels of any depth.
+ *
+ *      Copyright (C)  1999-2005 James Simmons <jsimmons@www.infradead.org>
+ *
+ *  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/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+#include <linux/slab.h>
+#include <asm/types.h>
+#include <asm/io.h>
+
+#if BITS_PER_LONG == 32
+#  define FB_WRITEL fb_writel
+#  define FB_READL  fb_readl
+#else
+#  define FB_WRITEL fb_writeq
+#  define FB_READL  fb_readq
+#endif
+
+    /*
+     *  Compose two values, using a bitmask as decision value
+     *  This is equivalent to (a & mask) | (b & ~mask)
+     */
+
+static inline unsigned long
+comp(unsigned long a, unsigned long b, unsigned long mask)
+{
+    return ((a ^ b) & mask) ^ b;
+}
+
+    /*
+     *  Generic bitwise copy algorithm
+     */
+
+static void
+bitcpy(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
+	int src_idx, int bits, unsigned n)
+{
+	unsigned long first, last;
+	int const shift = dst_idx-src_idx;
+	int left, right;
+
+	first = ~0UL >> dst_idx;
+	last = ~(~0UL >> ((dst_idx+n) % bits));
+
+	if (!shift) {
+		// Same alignment for source and dest
+
+		if (dst_idx+n <= bits) {
+			// Single word
+			if (last)
+				first &= last;
+			FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+		} else {
+			// Multiple destination words
+
+			// Leading bits
+			if (first != ~0UL) {
+				FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+				dst++;
+				src++;
+				n -= bits - dst_idx;
+			}
+
+			// Main chunk
+			n /= bits;
+			while (n >= 8) {
+				FB_WRITEL(FB_READL(src++), dst++);
+				FB_WRITEL(FB_READL(src++), dst++);
+				FB_WRITEL(FB_READL(src++), dst++);
+				FB_WRITEL(FB_READL(src++), dst++);
+				FB_WRITEL(FB_READL(src++), dst++);
+				FB_WRITEL(FB_READL(src++), dst++);
+				FB_WRITEL(FB_READL(src++), dst++);
+				FB_WRITEL(FB_READL(src++), dst++);
+				n -= 8;
+			}
+			while (n--)
+				FB_WRITEL(FB_READL(src++), dst++);
+
+			// Trailing bits
+			if (last)
+				FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
+		}
+	} else {
+		unsigned long d0, d1;
+		int m;
+		// Different alignment for source and dest
+
+		right = shift & (bits - 1);
+		left = -shift & (bits - 1);
+
+		if (dst_idx+n <= bits) {
+			// Single destination word
+			if (last)
+				first &= last;
+			if (shift > 0) {
+				// Single source word
+				FB_WRITEL( comp( FB_READL(src) >> right, FB_READL(dst), first), dst);
+			} else if (src_idx+n <= bits) {
+				// Single source word
+				FB_WRITEL( comp(FB_READL(src) << left, FB_READL(dst), first), dst);
+			} else {
+				// 2 source words
+				d0 = FB_READL(src++);
+				d1 = FB_READL(src);
+				FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
+			}
+		} else {
+			// Multiple destination words
+			/** We must always remember the last value read, because in case
+			SRC and DST overlap bitwise (e.g. when moving just one pixel in
+			1bpp), we always collect one full long for DST and that might
+			overlap with the current long from SRC. We store this value in
+			'd0'. */
+			d0 = FB_READL(src++);
+			// Leading bits
+			if (shift > 0) {
+				// Single source word
+				FB_WRITEL( comp(d0 >> right, FB_READL(dst), first), dst);
+				dst++;
+				n -= bits - dst_idx;
+			} else {
+				// 2 source words
+				d1 = FB_READL(src++);
+				FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
+				d0 = d1;
+				dst++;
+				n -= bits - dst_idx;
+			}
+
+			// Main chunk
+			m = n % bits;
+			n /= bits;
+			while (n >= 4) {
+				d1 = FB_READL(src++);
+				FB_WRITEL(d0 << left | d1 >> right, dst++);
+				d0 = d1;
+				d1 = FB_READL(src++);
+				FB_WRITEL(d0 << left | d1 >> right, dst++);
+				d0 = d1;
+				d1 = FB_READL(src++);
+				FB_WRITEL(d0 << left | d1 >> right, dst++);
+				d0 = d1;
+				d1 = FB_READL(src++);
+				FB_WRITEL(d0 << left | d1 >> right, dst++);
+				d0 = d1;
+				n -= 4;
+			}
+			while (n--) {
+				d1 = FB_READL(src++);
+				FB_WRITEL(d0 << left | d1 >> right, dst++);
+				d0 = d1;
+			}
+
+			// Trailing bits
+			if (last) {
+				if (m <= right) {
+					// Single source word
+					FB_WRITEL( comp(d0 << left, FB_READL(dst), last), dst);
+				} else {
+					// 2 source words
+					d1 = FB_READL(src);
+					FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), last), dst);
+				}
+			}
+		}
+	}
+}
+
+    /*
+     *  Generic bitwise copy algorithm, operating backward
+     */
+
+static void
+bitcpy_rev(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
+		int src_idx, int bits, unsigned n)
+{
+	unsigned long first, last;
+	int shift;
+
+	dst += (n-1)/bits;
+	src += (n-1)/bits;
+	if ((n-1) % bits) {
+		dst_idx += (n-1) % bits;
+		dst += dst_idx >> (ffs(bits) - 1);
+		dst_idx &= bits - 1;
+		src_idx += (n-1) % bits;
+		src += src_idx >> (ffs(bits) - 1);
+		src_idx &= bits - 1;
+	}
+
+	shift = dst_idx-src_idx;
+
+	first = ~0UL << (bits - 1 - dst_idx);
+	last = ~(~0UL << (bits - 1 - ((dst_idx-n) % bits)));
+
+	if (!shift) {
+		// Same alignment for source and dest
+
+		if ((unsigned long)dst_idx+1 >= n) {
+			// Single word
+			if (last)
+				first &= last;
+			FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+		} else {
+			// Multiple destination words
+
+			// Leading bits
+			if (first != ~0UL) {
+				FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+				dst--;
+				src--;
+				n -= dst_idx+1;
+			}
+
+			// Main chunk
+			n /= bits;
+			while (n >= 8) {
+				FB_WRITEL(FB_READL(src--), dst--);
+				FB_WRITEL(FB_READL(src--), dst--);
+				FB_WRITEL(FB_READL(src--), dst--);
+				FB_WRITEL(FB_READL(src--), dst--);
+				FB_WRITEL(FB_READL(src--), dst--);
+				FB_WRITEL(FB_READL(src--), dst--);
+				FB_WRITEL(FB_READL(src--), dst--);
+				FB_WRITEL(FB_READL(src--), dst--);
+				n -= 8;
+			}
+			while (n--)
+				FB_WRITEL(FB_READL(src--), dst--);
+
+			// Trailing bits
+			if (last)
+				FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
+		}
+	} else {
+		// Different alignment for source and dest
+
+		int const left = -shift & (bits-1);
+		int const right = shift & (bits-1);
+
+		if ((unsigned long)dst_idx+1 >= n) {
+			// Single destination word
+			if (last)
+				first &= last;
+			if (shift < 0) {
+				// Single source word
+				FB_WRITEL( comp( FB_READL(src)<<left, FB_READL(dst), first), dst);
+			} else if (1+(unsigned long)src_idx >= n) {
+				// Single source word
+				FB_WRITEL( comp( FB_READL(src)>>right, FB_READL(dst), first), dst);
+			} else {
+				// 2 source words
+				FB_WRITEL( comp( (FB_READL(src)>>right | FB_READL(src-1)<<left), FB_READL(dst), first), dst);
+			}
+		} else {
+			// Multiple destination words
+			/** We must always remember the last value read, because in case
+			SRC and DST overlap bitwise (e.g. when moving just one pixel in
+			1bpp), we always collect one full long for DST and that might
+			overlap with the current long from SRC. We store this value in
+			'd0'. */
+			unsigned long d0, d1;
+			int m;
+
+			d0 = FB_READL(src--);
+			// Leading bits
+			if (shift < 0) {
+				// Single source word
+				FB_WRITEL( comp( (d0 << left), FB_READL(dst), first), dst);
+			} else {
+				// 2 source words
+				d1 = FB_READL(src--);
+				FB_WRITEL( comp( (d0>>right | d1<<left), FB_READL(dst), first), dst);
+				d0 = d1;
+			}
+			dst--;
+			n -= dst_idx+1;
+
+			// Main chunk
+			m = n % bits;
+			n /= bits;
+			while (n >= 4) {
+				d1 = FB_READL(src--);
+				FB_WRITEL(d0 >> right | d1 << left, dst--);
+				d0 = d1;
+				d1 = FB_READL(src--);
+				FB_WRITEL(d0 >> right | d1 << left, dst--);
+				d0 = d1;
+				d1 = FB_READL(src--);
+				FB_WRITEL(d0 >> right | d1 << left, dst--);
+				d0 = d1;
+				d1 = FB_READL(src--);
+				FB_WRITEL(d0 >> right | d1 << left, dst--);
+				d0 = d1;
+				n -= 4;
+			}
+			while (n--) {
+				d1 = FB_READL(src--);
+				FB_WRITEL(d0 >> right | d1 << left, dst--);
+				d0 = d1;
+			}
+
+			// Trailing bits
+			if (last) {
+				if (m <= left) {
+					// Single source word
+					FB_WRITEL( comp(d0 >> right, FB_READL(dst), last), dst);
+				} else {
+					// 2 source words
+					d1 = FB_READL(src);
+					FB_WRITEL( comp(d0>>right | d1<<left, FB_READL(dst), last), dst);
+				}
+			}
+		}
+	}
+}
+
+void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
+{
+	u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
+	u32 height = area->height, width = area->width;
+	unsigned long const bits_per_line = p->fix.line_length*8u;
+	unsigned long __iomem *dst = NULL, *src = NULL;
+	int bits = BITS_PER_LONG, bytes = bits >> 3;
+	int dst_idx = 0, src_idx = 0, rev_copy = 0;
+	int x2, y2, vxres, vyres;
+
+	if (p->state != FBINFO_STATE_RUNNING)
+		return;
+
+	/* We want rotation but lack hardware to do it for us. */
+	if (!p->fbops->fb_rotate && p->var.rotate) {
+	}
+
+	vxres = p->var.xres_virtual;
+	vyres = p->var.yres_virtual;
+
+	if (area->dx > vxres || area->sx > vxres ||
+	    area->dy > vyres || area->sy > vyres)
+		return;
+
+	/* clip the destination
+	 * We could use hardware clipping but on many cards you get around
+	 * hardware clipping by writing to framebuffer directly.
+	 */
+	x2 = area->dx + area->width;
+	y2 = area->dy + area->height;
+	dx = area->dx > 0 ? area->dx : 0;
+	dy = area->dy > 0 ? area->dy : 0;
+	x2 = x2 < vxres ? x2 : vxres;
+	y2 = y2 < vyres ? y2 : vyres;
+	width = x2 - dx;
+	height = y2 - dy;
+
+	if ((width==0) ||(height==0))
+		return;
+
+	/* update sx1,sy1 */
+	sx += (dx - area->dx);
+	sy += (dy - area->dy);
+
+	/* the source must be completely inside the virtual screen */
+	if (sx < 0 || sy < 0 || (sx + width) > vxres || (sy + height) > vyres)
+		return;
+
+	/* if the beginning of the target area might overlap with the end of
+	the source area, be have to copy the area reverse. */
+	if ((dy == sy && dx > sx) || (dy > sy)) {
+		dy += height;
+		sy += height;
+		rev_copy = 1;
+	}
+
+	// split the base of the framebuffer into a long-aligned address and the
+	// index of the first bit
+	dst = src = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
+	dst_idx = src_idx = 8*((unsigned long)p->screen_base & (bytes-1));
+	// add offset of source and target area
+	dst_idx += dy*bits_per_line + dx*p->var.bits_per_pixel;
+	src_idx += sy*bits_per_line + sx*p->var.bits_per_pixel;
+
+	if (p->fbops->fb_sync)
+		p->fbops->fb_sync(p);
+
+	if (rev_copy) {
+		while (height--) {
+			dst_idx -= bits_per_line;
+			src_idx -= bits_per_line;
+			dst += dst_idx >> (ffs(bits) - 1);
+			dst_idx &= (bytes - 1);
+			src += src_idx >> (ffs(bits) - 1);
+			src_idx &= (bytes - 1);
+			bitcpy_rev(dst, dst_idx, src, src_idx, bits,
+				width*p->var.bits_per_pixel);
+		}
+	} else {
+		while (height--) {
+			dst += dst_idx >> (ffs(bits) - 1);
+			dst_idx &= (bytes - 1);
+			src += src_idx >> (ffs(bits) - 1);
+			src_idx &= (bytes - 1);
+			bitcpy(dst, dst_idx, src, src_idx, bits,
+				width*p->var.bits_per_pixel);
+			dst_idx += bits_per_line;
+			src_idx += bits_per_line;
+		}
+	}
+}
+
+EXPORT_SYMBOL(cfb_copyarea);
+
+MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
+MODULE_DESCRIPTION("Generic software accelerated copyarea");
+MODULE_LICENSE("GPL");
+