mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
be0d9b6c7a
The drawing function cfbfillrect does not work correctly when access is not unsigned-long aligned. It manifests as extra lines of pixels that are not complete drawn. Reversing the shift operator solves the problem, so I would presume that this bug would manifest only on little endian machines. The function cfbcopyarea may also have this bug. Aligned access should present no problems. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
406 lines
10 KiB
C
406 lines
10 KiB
C
/*
|
|
* 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 = FB_SHIFT_HIGH(~0UL, dst_idx);
|
|
last = ~(FB_SHIFT_HIGH(~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 = FB_SHIFT_LOW(~0UL, bits - 1 - dst_idx);
|
|
last = ~(FB_SHIFT_LOW(~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;
|
|
|
|
if (p->state != FBINFO_STATE_RUNNING)
|
|
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");
|
|
|