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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / drivers / video / console / bitblit.c
blob28b1a834906b1f59d31c49421e771aa5e6f8aae7
1 /*
2 * linux/drivers/video/console/bitblit.c -- BitBlitting Operation
3 *
4 * Originally from the 'accel_*' routines in drivers/video/console/fbcon.c
5 *
6 * Copyright (C) 2004 Antonino Daplas <adaplas @pol.net>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
10 * more details.
11 */
12
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/string.h>
16 #include <linux/fb.h>
17 #include <linux/vt_kern.h>
18 #include <linux/console.h>
19 #include <asm/types.h>
20 #include "fbcon.h"
21
22 /*
23 * Accelerated handlers.
24 */
25 static void update_attr(u8 *dst, u8 *src, int attribute,
26 struct vc_data *vc)
27 {
28 int i, offset = (vc->vc_font.height < 10) ? 1 : 2;
29 int width = DIV_ROUND_UP(vc->vc_font.width, 8);
30 unsigned int cellsize = vc->vc_font.height * width;
31 u8 c;
32
33 offset = cellsize - (offset * width);
34 for (i = 0; i < cellsize; i++) {
35 c = src[i];
36 if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i >= offset)
37 c = 0xff;
38 if (attribute & FBCON_ATTRIBUTE_BOLD)
39 c |= c >> 1;
40 if (attribute & FBCON_ATTRIBUTE_REVERSE)
41 c = ~c;
42 dst[i] = c;
43 }
44 }
45
46 static void bit_bmove(struct vc_data *vc, struct fb_info *info, int sy,
47 int sx, int dy, int dx, int height, int width)
48 {
49 struct fb_copyarea area;
50
51 area.sx = sx * vc->vc_font.width;
52 area.sy = sy * vc->vc_font.height;
53 area.dx = dx * vc->vc_font.width;
54 area.dy = dy * vc->vc_font.height;
55 area.height = height * vc->vc_font.height;
56 area.width = width * vc->vc_font.width;
57
58 info->fbops->fb_copyarea(info, &area);
59 }
60
61 static void bit_clear(struct vc_data *vc, struct fb_info *info, int sy,
62 int sx, int height, int width)
63 {
64 int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
65 struct fb_fillrect region;
66
67 region.color = attr_bgcol_ec(bgshift, vc, info);
68 region.dx = sx * vc->vc_font.width;
69 region.dy = sy * vc->vc_font.height;
70 region.width = width * vc->vc_font.width;
71 region.height = height * vc->vc_font.height;
72 region.rop = ROP_COPY;
73
74 info->fbops->fb_fillrect(info, &region);
75 }
76
77 static inline void bit_putcs_aligned(struct vc_data *vc, struct fb_info *info,
78 const u16 *s, u32 attr, u32 cnt,
79 u32 d_pitch, u32 s_pitch, u32 cellsize,
80 struct fb_image *image, u8 *buf, u8 *dst)
81 {
82 u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
83 u32 idx = vc->vc_font.width >> 3;
84 u8 *src;
85
86 while (cnt--) {
87 src = vc->vc_font.data + (scr_readw(s++)&
88 charmask)*cellsize;
89
90 if (attr) {
91 update_attr(buf, src, attr, vc);
92 src = buf;
93 }
94
95 if (likely(idx == 1))
96 __fb_pad_aligned_buffer(dst, d_pitch, src, idx,
97 image->height);
98 else
99 fb_pad_aligned_buffer(dst, d_pitch, src, idx,
100 image->height);
101
102 dst += s_pitch;
103 }
104
105 info->fbops->fb_imageblit(info, image);
106 }
107
108 static inline void bit_putcs_unaligned(struct vc_data *vc,
109 struct fb_info *info, const u16 *s,
110 u32 attr, u32 cnt, u32 d_pitch,
111 u32 s_pitch, u32 cellsize,
112 struct fb_image *image, u8 *buf,
113 u8 *dst)
114 {
115 u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
116 u32 shift_low = 0, mod = vc->vc_font.width % 8;
117 u32 shift_high = 8;
118 u32 idx = vc->vc_font.width >> 3;
119 u8 *src;
120
121 while (cnt--) {
122 src = vc->vc_font.data + (scr_readw(s++)&
123 charmask)*cellsize;
124
125 if (attr) {
126 update_attr(buf, src, attr, vc);
127 src = buf;
128 }
129
130 fb_pad_unaligned_buffer(dst, d_pitch, src, idx,
131 image->height, shift_high,
132 shift_low, mod);
133 shift_low += mod;
134 dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;
135 shift_low &= 7;
136 shift_high = 8 - shift_low;
137 }
138
139 info->fbops->fb_imageblit(info, image);
140
141 }
142
143 static void bit_putcs(struct vc_data *vc, struct fb_info *info,
144 const unsigned short *s, int count, int yy, int xx,
145 int fg, int bg)
146 {
147 struct fb_image image;
148 u32 width = DIV_ROUND_UP(vc->vc_font.width, 8);
149 u32 cellsize = width * vc->vc_font.height;
150 u32 maxcnt = info->pixmap.size/cellsize;
151 u32 scan_align = info->pixmap.scan_align - 1;
152 u32 buf_align = info->pixmap.buf_align - 1;
153 u32 mod = vc->vc_font.width % 8, cnt, pitch, size;
154 u32 attribute = get_attribute(info, scr_readw(s));
155 u8 *dst, *buf = NULL;
156
157 image.fg_color = fg;
158 image.bg_color = bg;
159 image.dx = xx * vc->vc_font.width;
160 image.dy = yy * vc->vc_font.height;
161 image.height = vc->vc_font.height;
162 image.depth = 1;
163
164 if (attribute) {
165 buf = kmalloc(cellsize, GFP_KERNEL);
166 if (!buf)
167 return;
168 }
169
170 while (count) {
171 if (count > maxcnt)
172 cnt = maxcnt;
173 else
174 cnt = count;
175
176 image.width = vc->vc_font.width * cnt;
177 pitch = DIV_ROUND_UP(image.width, 8) + scan_align;
178 pitch &= ~scan_align;
179 size = pitch * image.height + buf_align;
180 size &= ~buf_align;
181 dst = fb_get_buffer_offset(info, &info->pixmap, size);
182 image.data = dst;
183
184 if (!mod)
185 bit_putcs_aligned(vc, info, s, attribute, cnt, pitch,
186 width, cellsize, &image, buf, dst);
187 else
188 bit_putcs_unaligned(vc, info, s, attribute, cnt,
189 pitch, width, cellsize, &image,
190 buf, dst);
191
192 image.dx += cnt * vc->vc_font.width;
193 count -= cnt;
194 s += cnt;
195 }
196
197 /* buf is always NULL except when in monochrome mode, so in this case
198 it's a gain to check buf against NULL even though kfree() handles
199 NULL pointers just fine */
200 if (unlikely(buf))
201 kfree(buf);
202
203 }
204
205 static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
206 int bottom_only)
207 {
208 int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
209 unsigned int cw = vc->vc_font.width;
210 unsigned int ch = vc->vc_font.height;
211 unsigned int rw = info->var.xres - (vc->vc_cols*cw);
212 unsigned int bh = info->var.yres - (vc->vc_rows*ch);
213 unsigned int rs = info->var.xres - rw;
214 unsigned int bs = info->var.yres - bh;
215 struct fb_fillrect region;
216
217 region.color = attr_bgcol_ec(bgshift, vc, info);
218 region.rop = ROP_COPY;
219
220 if (rw && !bottom_only) {
221 region.dx = info->var.xoffset + rs;
222 region.dy = 0;
223 region.width = rw;
224 region.height = info->var.yres_virtual;
225 info->fbops->fb_fillrect(info, &region);
226 }
227
228 if (bh) {
229 region.dx = info->var.xoffset;
230 region.dy = info->var.yoffset + bs;
231 region.width = rs;
232 region.height = bh;
233 info->fbops->fb_fillrect(info, &region);
234 }
235 }
236
237 static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,
238 int softback_lines, int fg, int bg)
239 {
240 struct fb_cursor cursor;
241 struct fbcon_ops *ops = info->fbcon_par;
242 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
243 int w = DIV_ROUND_UP(vc->vc_font.width, 8), c;
244 int y = real_y(ops->p, vc->vc_y);
245 int attribute, use_sw = (vc->vc_cursor_type & 0x10);
246 int err = 1;
247 char *src;
248
249 cursor.set = 0;
250
251 if (softback_lines) {
252 if (y + softback_lines >= vc->vc_rows) {
253 mode = CM_ERASE;
254 ops->cursor_flash = 0;
255 return;
256 } else
257 y += softback_lines;
258 }
259
260 c = scr_readw((u16 *) vc->vc_pos);
261 attribute = get_attribute(info, c);
262 src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
263
264 if (ops->cursor_state.image.data != src ||
265 ops->cursor_reset) {
266 ops->cursor_state.image.data = src;
267 cursor.set |= FB_CUR_SETIMAGE;
268 }
269
270 if (attribute) {
271 u8 *dst;
272
273 dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
274 if (!dst)
275 return;
276 kfree(ops->cursor_data);
277 ops->cursor_data = dst;
278 update_attr(dst, src, attribute, vc);
279 src = dst;
280 }
281
282 if (ops->cursor_state.image.fg_color != fg ||
283 ops->cursor_state.image.bg_color != bg ||
284 ops->cursor_reset) {
285 ops->cursor_state.image.fg_color = fg;
286 ops->cursor_state.image.bg_color = bg;
287 cursor.set |= FB_CUR_SETCMAP;
288 }
289
290 if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||
291 (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
292 ops->cursor_reset) {
293 ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;
294 ops->cursor_state.image.dy = vc->vc_font.height * y;
295 cursor.set |= FB_CUR_SETPOS;
296 }
297
298 if (ops->cursor_state.image.height != vc->vc_font.height ||
299 ops->cursor_state.image.width != vc->vc_font.width ||
300 ops->cursor_reset) {
301 ops->cursor_state.image.height = vc->vc_font.height;
302 ops->cursor_state.image.width = vc->vc_font.width;
303 cursor.set |= FB_CUR_SETSIZE;
304 }
305
306 if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
307 ops->cursor_reset) {
308 ops->cursor_state.hot.x = cursor.hot.y = 0;
309 cursor.set |= FB_CUR_SETHOT;
310 }
311
312 if (cursor.set & FB_CUR_SETSIZE ||
313 vc->vc_cursor_type != ops->p->cursor_shape ||
314 ops->cursor_state.mask == NULL ||
315 ops->cursor_reset) {
316 char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
317 int cur_height, size, i = 0;
318 u8 msk = 0xff;
319
320 if (!mask)
321 return;
322
323 kfree(ops->cursor_state.mask);
324 ops->cursor_state.mask = mask;
325
326 ops->p->cursor_shape = vc->vc_cursor_type;
327 cursor.set |= FB_CUR_SETSHAPE;
328
329 switch (ops->p->cursor_shape & CUR_HWMASK) {
330 case CUR_NONE:
331 cur_height = 0;
332 break;
333 case CUR_UNDERLINE:
334 cur_height = (vc->vc_font.height < 10) ? 1 : 2;
335 break;
336 case CUR_LOWER_THIRD:
337 cur_height = vc->vc_font.height/3;
338 break;
339 case CUR_LOWER_HALF:
340 cur_height = vc->vc_font.height >> 1;
341 break;
342 case CUR_TWO_THIRDS:
343 cur_height = (vc->vc_font.height << 1)/3;
344 break;
345 case CUR_BLOCK:
346 default:
347 cur_height = vc->vc_font.height;
348 break;
349 }
350 size = (vc->vc_font.height - cur_height) * w;
351 while (size--)
352 mask[i++] = ~msk;
353 size = cur_height * w;
354 while (size--)
355 mask[i++] = msk;
356 }
357
358 switch (mode) {
359 case CM_ERASE:
360 ops->cursor_state.enable = 0;
361 break;
362 case CM_DRAW:
363 case CM_MOVE:
364 default:
365 ops->cursor_state.enable = (use_sw) ? 0 : 1;
366 break;
367 }
368
369 cursor.image.data = src;
370 cursor.image.fg_color = ops->cursor_state.image.fg_color;
371 cursor.image.bg_color = ops->cursor_state.image.bg_color;
372 cursor.image.dx = ops->cursor_state.image.dx;
373 cursor.image.dy = ops->cursor_state.image.dy;
374 cursor.image.height = ops->cursor_state.image.height;
375 cursor.image.width = ops->cursor_state.image.width;
376 cursor.hot.x = ops->cursor_state.hot.x;
377 cursor.hot.y = ops->cursor_state.hot.y;
378 cursor.mask = ops->cursor_state.mask;
379 cursor.enable = ops->cursor_state.enable;
380 cursor.image.depth = 1;
381 cursor.rop = ROP_XOR;
382
383 if (info->fbops->fb_cursor)
384 err = info->fbops->fb_cursor(info, &cursor);
385
386 if (err)
387 soft_cursor(info, &cursor);
388
389 ops->cursor_reset = 0;
390 }
391
392 static int bit_update_start(struct fb_info *info)
393 {
394 struct fbcon_ops *ops = info->fbcon_par;
395 int err;
396
397 err = fb_pan_display(info, &ops->var);
398 ops->var.xoffset = info->var.xoffset;
399 ops->var.yoffset = info->var.yoffset;
400 ops->var.vmode = info->var.vmode;
401 return err;
402 }
403
404 void fbcon_set_bitops(struct fbcon_ops *ops)
405 {
406 ops->bmove = bit_bmove;
407 ops->clear = bit_clear;
408 ops->putcs = bit_putcs;
409 ops->clear_margins = bit_clear_margins;
410 ops->cursor = bit_cursor;
411 ops->update_start = bit_update_start;
412 ops->rotate_font = NULL;
413
414 if (ops->rotate)
415 fbcon_set_rotate(ops);
416 }
417
418 EXPORT_SYMBOL(fbcon_set_bitops);
419
420 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
421 MODULE_DESCRIPTION("Bit Blitting Operation");
422 MODULE_LICENSE("GPL");
423