2 * linux/drivers/video/fbmem.c
4 * Copyright (C) 1994 Martin Schaller
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive
14 #include <linux/config.h>
15 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/sched.h>
20 #include <linux/smp_lock.h>
21 #include <linux/kernel.h>
22 #include <linux/major.h>
23 #include <linux/slab.h>
25 #include <linux/mman.h>
26 #include <linux/tty.h>
27 #include <linux/init.h>
28 #include <linux/linux_logo.h>
29 #include <linux/proc_fs.h>
30 #include <linux/console.h>
32 #include <linux/kmod.h>
34 #include <linux/devfs_fs_kernel.h>
35 #include <linux/err.h>
36 #include <linux/kernel.h>
37 #include <linux/device.h>
38 #include <linux/efi.h>
40 #if defined(__mc68000__) || defined(CONFIG_APUS)
41 #include <asm/setup.h>
45 #include <asm/uaccess.h>
47 #include <asm/pgtable.h>
52 * Frame buffer device initialization and setup routines
55 #define FBPIXMAPSIZE (1024 * 8)
57 static struct notifier_block *fb_notifier_list;
58 struct fb_info *registered_fb[FB_MAX];
59 int num_registered_fb;
65 int fb_get_color_depth(struct fb_var_screeninfo *var)
67 if (var->green.length == var->blue.length &&
68 var->green.length == var->red.length &&
69 !var->green.offset && !var->blue.offset &&
71 return var->green.length;
73 return (var->green.length + var->red.length +
76 EXPORT_SYMBOL(fb_get_color_depth);
81 void fb_iomove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
82 u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
87 for (i = height; i--; ) {
88 buf->outbuf(info, dst, src, s_pitch);
94 void fb_sysmove_buf_aligned(struct fb_info *info, struct fb_pixmap *buf,
95 u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
100 for (i = height; i--; ) {
101 for (j = 0; j < s_pitch; j++)
108 void fb_iomove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
109 u8 *dst, u32 d_pitch, u8 *src, u32 idx,
110 u32 height, u32 shift_high, u32 shift_low,
113 u8 mask = (u8) (0xfff << shift_high), tmp;
116 for (i = height; i--; ) {
117 for (j = 0; j < idx; j++) {
118 tmp = buf->inbuf(info, dst+j);
120 tmp |= *src >> shift_low;
121 buf->outbuf(info, dst+j, &tmp, 1);
122 tmp = *src << shift_high;
123 buf->outbuf(info, dst+j+1, &tmp, 1);
126 tmp = buf->inbuf(info, dst+idx);
128 tmp |= *src >> shift_low;
129 buf->outbuf(info, dst+idx, &tmp, 1);
130 if (shift_high < mod) {
131 tmp = *src << shift_high;
132 buf->outbuf(info, dst+idx+1, &tmp, 1);
139 void fb_sysmove_buf_unaligned(struct fb_info *info, struct fb_pixmap *buf,
140 u8 *dst, u32 d_pitch, u8 *src, u32 idx,
141 u32 height, u32 shift_high, u32 shift_low,
144 u8 mask = (u8) (0xfff << shift_high), tmp;
147 for (i = height; i--; ) {
148 for (j = 0; j < idx; j++) {
151 tmp |= *src >> shift_low;
153 tmp = *src << shift_high;
159 tmp |= *src >> shift_low;
161 if (shift_high < mod) {
162 tmp = *src << shift_high;
171 * we need to lock this section since fb_cursor
172 * may use fb_imageblit()
174 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
176 u32 align = buf->buf_align - 1, offset;
177 char *addr = buf->addr;
179 /* If IO mapped, we need to sync before access, no sharing of
182 if (buf->flags & FB_PIXMAP_IO) {
183 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
184 info->fbops->fb_sync(info);
188 /* See if we fit in the remaining pixmap space */
189 offset = buf->offset + align;
191 if (offset + size > buf->size) {
192 /* We do not fit. In order to be able to re-use the buffer,
193 * we must ensure no asynchronous DMA'ing or whatever operation
194 * is in progress, we sync for that.
196 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
197 info->fbops->fb_sync(info);
200 buf->offset = offset + size;
207 #include <linux/linux_logo.h>
209 static inline unsigned safe_shift(unsigned d, int n)
211 return n < 0 ? d >> -n : d << n;
214 static void fb_set_logocmap(struct fb_info *info,
215 const struct linux_logo *logo)
217 struct fb_cmap palette_cmap;
218 u16 palette_green[16];
219 u16 palette_blue[16];
222 const unsigned char *clut = logo->clut;
224 palette_cmap.start = 0;
225 palette_cmap.len = 16;
226 palette_cmap.red = palette_red;
227 palette_cmap.green = palette_green;
228 palette_cmap.blue = palette_blue;
229 palette_cmap.transp = NULL;
231 for (i = 0; i < logo->clutsize; i += n) {
232 n = logo->clutsize - i;
233 /* palette_cmap provides space for only 16 colors at once */
236 palette_cmap.start = 32 + i;
237 palette_cmap.len = n;
238 for (j = 0; j < n; ++j) {
239 palette_cmap.red[j] = clut[0] << 8 | clut[0];
240 palette_cmap.green[j] = clut[1] << 8 | clut[1];
241 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
244 fb_set_cmap(&palette_cmap, info);
248 static void fb_set_logo_truepalette(struct fb_info *info,
249 const struct linux_logo *logo,
252 unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
253 unsigned char redmask, greenmask, bluemask;
254 int redshift, greenshift, blueshift;
256 const unsigned char *clut = logo->clut;
259 * We have to create a temporary palette since console palette is only
262 /* Bug: Doesn't obey msb_right ... (who needs that?) */
263 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
264 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
265 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
266 redshift = info->var.red.offset - (8 - info->var.red.length);
267 greenshift = info->var.green.offset - (8 - info->var.green.length);
268 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
270 for ( i = 0; i < logo->clutsize; i++) {
271 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
272 safe_shift((clut[1] & greenmask), greenshift) |
273 safe_shift((clut[2] & bluemask), blueshift));
278 static void fb_set_logo_directpalette(struct fb_info *info,
279 const struct linux_logo *logo,
282 int redshift, greenshift, blueshift;
285 redshift = info->var.red.offset;
286 greenshift = info->var.green.offset;
287 blueshift = info->var.blue.offset;
289 for (i = 32; i < logo->clutsize; i++)
290 palette[i] = i << redshift | i << greenshift | i << blueshift;
293 static void fb_set_logo(struct fb_info *info,
294 const struct linux_logo *logo, u8 *dst,
298 const u8 *src = logo->data;
299 u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
301 if (fb_get_color_depth(&info->var) == 3)
306 for (i = 0; i < logo->height; i++)
307 for (j = 0; j < logo->width; src++) {
310 if (j < logo->width) {
311 *dst++ = *src & 0x0f;
317 for (i = 0; i < logo->height; i++) {
318 for (j = 0; j < logo->width; src++) {
320 for (k = 7; k >= 0; k--) {
321 *dst++ = ((d >> k) & 1) ? fg : 0;
331 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
332 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
333 * the visual format and color depth of the framebuffer, the DAC, the
334 * pseudo_palette, and the logo data will be adjusted accordingly.
336 * Case 1 - linux_logo_clut224:
337 * Color exceeds the number of console colors (16), thus we set the hardware DAC
338 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
340 * For visuals that require color info from the pseudo_palette, we also construct
341 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
344 * Case 2 - linux_logo_vga16:
345 * The number of colors just matches the console colors, thus there is no need
346 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
347 * each byte contains color information for two pixels (upper and lower nibble).
348 * To be consistent with fb_imageblit() usage, we therefore separate the two
349 * nibbles into separate bytes. The "depth" flag will be set to 4.
351 * Case 3 - linux_logo_mono:
352 * This is similar with Case 2. Each byte contains information for 8 pixels.
353 * We isolate each bit and expand each into a byte. The "depth" flag will
356 static struct logo_data {
358 int needs_directpalette;
359 int needs_truepalette;
361 const struct linux_logo *logo;
364 int fb_prepare_logo(struct fb_info *info)
366 int depth = fb_get_color_depth(&info->var);
368 memset(&fb_logo, 0, sizeof(struct logo_data));
370 if (info->flags & FBINFO_MISC_TILEBLITTING)
373 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
374 depth = info->var.blue.length;
375 if (info->var.red.length < depth)
376 depth = info->var.red.length;
377 if (info->var.green.length < depth)
378 depth = info->var.green.length;
382 switch (info->fix.visual) {
383 case FB_VISUAL_TRUECOLOR:
384 fb_logo.needs_truepalette = 1;
386 case FB_VISUAL_DIRECTCOLOR:
387 fb_logo.needs_directpalette = 1;
388 fb_logo.needs_cmapreset = 1;
390 case FB_VISUAL_PSEUDOCOLOR:
391 fb_logo.needs_cmapreset = 1;
396 /* Return if no suitable logo was found */
397 fb_logo.logo = fb_find_logo(depth);
399 if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
403 /* What depth we asked for might be different from what we get */
404 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
406 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
410 return fb_logo.logo->height;
413 int fb_show_logo(struct fb_info *info)
415 u32 *palette = NULL, *saved_pseudo_palette = NULL;
416 unsigned char *logo_new = NULL;
417 struct fb_image image;
420 /* Return if the frame buffer is not mapped or suspended */
421 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
425 image.data = fb_logo.logo->data;
427 if (fb_logo.needs_cmapreset)
428 fb_set_logocmap(info, fb_logo.logo);
430 if (fb_logo.needs_truepalette ||
431 fb_logo.needs_directpalette) {
432 palette = kmalloc(256 * 4, GFP_KERNEL);
436 if (fb_logo.needs_truepalette)
437 fb_set_logo_truepalette(info, fb_logo.logo, palette);
439 fb_set_logo_directpalette(info, fb_logo.logo, palette);
441 saved_pseudo_palette = info->pseudo_palette;
442 info->pseudo_palette = palette;
445 if (fb_logo.depth <= 4) {
446 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
448 if (logo_new == NULL) {
450 if (saved_pseudo_palette)
451 info->pseudo_palette = saved_pseudo_palette;
454 image.data = logo_new;
455 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
458 image.width = fb_logo.logo->width;
459 image.height = fb_logo.logo->height;
462 for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
463 x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
465 info->fbops->fb_imageblit(info, &image);
469 if (saved_pseudo_palette != NULL)
470 info->pseudo_palette = saved_pseudo_palette;
472 return fb_logo.logo->height;
475 int fb_prepare_logo(struct fb_info *info) { return 0; }
476 int fb_show_logo(struct fb_info *info) { return 0; }
477 #endif /* CONFIG_LOGO */
479 static int fbmem_read_proc(char *buf, char **start, off_t offset,
480 int len, int *eof, void *private)
486 for (fi = registered_fb; fi < ®istered_fb[FB_MAX] && len < 4000; fi++)
488 clen += sprintf(buf + clen, "%d %s\n",
491 *start = buf + offset;
496 return clen < len ? clen : len;
500 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
502 unsigned long p = *ppos;
503 struct inode *inode = file->f_dentry->d_inode;
504 int fbidx = iminor(inode);
505 struct fb_info *info = registered_fb[fbidx];
508 int c, i, cnt = 0, err = 0;
509 unsigned long total_size;
511 if (!info || ! info->screen_base)
514 if (info->state != FBINFO_STATE_RUNNING)
517 if (info->fbops->fb_read)
518 return info->fbops->fb_read(file, buf, count, ppos);
520 total_size = info->screen_size;
522 total_size = info->fix.smem_len;
526 if (count >= total_size)
528 if (count + p > total_size)
529 count = total_size - p;
532 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
537 src = (u32 __iomem *) (info->screen_base + p);
539 if (info->fbops->fb_sync)
540 info->fbops->fb_sync(info);
543 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
545 for (i = c >> 2; i--; )
546 *dst++ = fb_readl(src++);
548 u8 *dst8 = (u8 *) dst;
549 u8 __iomem *src8 = (u8 __iomem *) src;
551 for (i = c & 3; i--;)
552 *dst8++ = fb_readb(src8++);
554 src = (u32 __iomem *) src8;
557 if (copy_to_user(buf, buffer, c)) {
568 return (err) ? err : cnt;
572 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
574 unsigned long p = *ppos;
575 struct inode *inode = file->f_dentry->d_inode;
576 int fbidx = iminor(inode);
577 struct fb_info *info = registered_fb[fbidx];
580 int c, i, cnt = 0, err;
581 unsigned long total_size;
583 if (!info || !info->screen_base)
586 if (info->state != FBINFO_STATE_RUNNING)
589 if (info->fbops->fb_write)
590 return info->fbops->fb_write(file, buf, count, ppos);
592 total_size = info->screen_size;
594 total_size = info->fix.smem_len;
598 if (count >= total_size)
601 if (count + p > total_size) {
602 count = total_size - p;
606 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
611 dst = (u32 __iomem *) (info->screen_base + p);
613 if (info->fbops->fb_sync)
614 info->fbops->fb_sync(info);
617 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
619 if (copy_from_user(src, buf, c)) {
623 for (i = c >> 2; i--; )
624 fb_writel(*src++, dst++);
626 u8 *src8 = (u8 *) src;
627 u8 __iomem *dst8 = (u8 __iomem *) dst;
629 for (i = c & 3; i--; )
630 fb_writeb(*src8++, dst8++);
632 dst = (u32 __iomem *) dst8;
641 return (err) ? err : cnt;
645 static void try_to_load(int fb)
647 request_module("fb%d", fb);
649 #endif /* CONFIG_KMOD */
652 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
654 int xoffset = var->xoffset;
655 int yoffset = var->yoffset;
658 if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
659 xoffset + info->var.xres > info->var.xres_virtual ||
660 yoffset + info->var.yres > info->var.yres_virtual)
662 if ((err = info->fbops->fb_pan_display(var, info)))
664 info->var.xoffset = var->xoffset;
665 info->var.yoffset = var->yoffset;
666 if (var->vmode & FB_VMODE_YWRAP)
667 info->var.vmode |= FB_VMODE_YWRAP;
669 info->var.vmode &= ~FB_VMODE_YWRAP;
674 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
678 if (var->activate & FB_ACTIVATE_INV_MODE) {
679 struct fb_videomode mode1, mode2;
682 fb_var_to_videomode(&mode1, var);
683 fb_var_to_videomode(&mode2, &info->var);
684 /* make sure we don't delete the videomode of current var */
685 ret = fb_mode_is_equal(&mode1, &mode2);
688 struct fb_event event;
692 ret = notifier_call_chain(&fb_notifier_list,
693 FB_EVENT_MODE_DELETE, &event);
697 fb_delete_videomode(&mode1, &info->modelist);
702 if ((var->activate & FB_ACTIVATE_FORCE) ||
703 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
704 if (!info->fbops->fb_check_var) {
709 if ((err = info->fbops->fb_check_var(var, info)))
712 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
713 struct fb_videomode mode;
717 if (info->fbops->fb_set_par)
718 info->fbops->fb_set_par(info);
720 fb_pan_display(info, &info->var);
722 fb_set_cmap(&info->cmap, info);
724 fb_var_to_videomode(&mode, &info->var);
726 if (info->modelist.prev && info->modelist.next &&
727 !list_empty(&info->modelist))
728 err = fb_add_videomode(&mode, &info->modelist);
730 if (!err && info->flags & FBINFO_MISC_USEREVENT) {
731 struct fb_event event;
733 info->flags &= ~FBINFO_MISC_USEREVENT;
735 notifier_call_chain(&fb_notifier_list,
736 FB_EVENT_MODE_CHANGE,
745 fb_blank(struct fb_info *info, int blank)
749 if (blank > FB_BLANK_POWERDOWN)
750 blank = FB_BLANK_POWERDOWN;
752 if (info->fbops->fb_blank)
753 ret = info->fbops->fb_blank(blank, info);
756 struct fb_event event;
760 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
767 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
770 int fbidx = iminor(inode);
771 struct fb_info *info = registered_fb[fbidx];
772 struct fb_ops *fb = info->fbops;
773 struct fb_var_screeninfo var;
774 struct fb_fix_screeninfo fix;
775 struct fb_con2fbmap con2fb;
776 struct fb_cmap_user cmap;
777 struct fb_event event;
778 void __user *argp = (void __user *)arg;
784 case FBIOGET_VSCREENINFO:
785 return copy_to_user(argp, &info->var,
786 sizeof(var)) ? -EFAULT : 0;
787 case FBIOPUT_VSCREENINFO:
788 if (copy_from_user(&var, argp, sizeof(var)))
790 acquire_console_sem();
791 info->flags |= FBINFO_MISC_USEREVENT;
792 i = fb_set_var(info, &var);
793 info->flags &= ~FBINFO_MISC_USEREVENT;
794 release_console_sem();
796 if (copy_to_user(argp, &var, sizeof(var)))
799 case FBIOGET_FSCREENINFO:
800 return copy_to_user(argp, &info->fix,
801 sizeof(fix)) ? -EFAULT : 0;
803 if (copy_from_user(&cmap, argp, sizeof(cmap)))
805 return (fb_set_user_cmap(&cmap, info));
807 if (copy_from_user(&cmap, argp, sizeof(cmap)))
809 return fb_cmap_to_user(&info->cmap, &cmap);
810 case FBIOPAN_DISPLAY:
811 if (copy_from_user(&var, argp, sizeof(var)))
813 acquire_console_sem();
814 i = fb_pan_display(info, &var);
815 release_console_sem();
818 if (copy_to_user(argp, &var, sizeof(var)))
823 case FBIOGET_CON2FBMAP:
824 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
826 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
828 con2fb.framebuffer = -1;
830 event.data = &con2fb;
831 notifier_call_chain(&fb_notifier_list,
832 FB_EVENT_GET_CONSOLE_MAP, &event);
833 return copy_to_user(argp, &con2fb,
834 sizeof(con2fb)) ? -EFAULT : 0;
835 case FBIOPUT_CON2FBMAP:
836 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
838 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
840 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
843 if (!registered_fb[con2fb.framebuffer])
844 try_to_load(con2fb.framebuffer);
845 #endif /* CONFIG_KMOD */
846 if (!registered_fb[con2fb.framebuffer])
849 event.data = &con2fb;
850 return notifier_call_chain(&fb_notifier_list,
851 FB_EVENT_SET_CONSOLE_MAP,
854 acquire_console_sem();
855 info->flags |= FBINFO_MISC_USEREVENT;
856 i = fb_blank(info, arg);
857 info->flags &= ~FBINFO_MISC_USEREVENT;
858 release_console_sem();
861 if (fb->fb_ioctl == NULL)
863 return fb->fb_ioctl(inode, file, cmd, arg, info);
869 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
871 int fbidx = iminor(file->f_dentry->d_inode);
872 struct fb_info *info = registered_fb[fbidx];
873 struct fb_ops *fb = info->fbops;
876 if (fb->fb_compat_ioctl == NULL)
879 ret = fb->fb_compat_ioctl(file, cmd, arg, info);
886 fb_mmap(struct file *file, struct vm_area_struct * vma)
888 int fbidx = iminor(file->f_dentry->d_inode);
889 struct fb_info *info = registered_fb[fbidx];
890 struct fb_ops *fb = info->fbops;
892 #if !defined(__sparc__) || defined(__sparc_v9__)
897 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
899 off = vma->vm_pgoff << PAGE_SHIFT;
905 res = fb->fb_mmap(info, file, vma);
910 #if defined(__sparc__) && !defined(__sparc_v9__)
911 /* Should never get here, all fb drivers should have their own
918 /* frame buffer memory */
919 start = info->fix.smem_start;
920 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
922 /* memory mapped io */
924 if (info->var.accel_flags) {
928 start = info->fix.mmio_start;
929 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
933 if ((vma->vm_end - vma->vm_start + off) > len)
936 vma->vm_pgoff = off >> PAGE_SHIFT;
937 /* This is an IO map - tell maydump to skip this VMA */
938 vma->vm_flags |= VM_IO | VM_RESERVED;
939 #if defined(__sparc_v9__)
940 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
941 vma->vm_end - vma->vm_start, vma->vm_page_prot))
944 #if defined(__mc68000__)
945 #if defined(CONFIG_SUN3)
946 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
947 #elif defined(CONFIG_MMU)
948 if (CPU_IS_020_OR_030)
949 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
950 if (CPU_IS_040_OR_060) {
951 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
952 /* Use no-cache mode, serialized */
953 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
956 #elif defined(__powerpc__)
957 vma->vm_page_prot = phys_mem_access_prot(file, off,
958 vma->vm_end - vma->vm_start,
960 #elif defined(__alpha__)
961 /* Caching is off in the I/O space quadrant by design. */
962 #elif defined(__i386__) || defined(__x86_64__)
963 if (boot_cpu_data.x86 > 3)
964 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
965 #elif defined(__mips__)
966 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
967 #elif defined(__hppa__)
968 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
969 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
970 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
971 #elif defined(__ia64__)
972 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
973 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
975 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
977 #warning What do we have to do here??
979 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
980 vma->vm_end - vma->vm_start, vma->vm_page_prot))
982 #endif /* !__sparc_v9__ */
984 #endif /* !sparc32 */
988 fb_open(struct inode *inode, struct file *file)
990 int fbidx = iminor(inode);
991 struct fb_info *info;
997 if (!(info = registered_fb[fbidx]))
999 #endif /* CONFIG_KMOD */
1000 if (!(info = registered_fb[fbidx]))
1002 if (!try_module_get(info->fbops->owner))
1004 if (info->fbops->fb_open) {
1005 res = info->fbops->fb_open(info,1);
1007 module_put(info->fbops->owner);
1013 fb_release(struct inode *inode, struct file *file)
1015 int fbidx = iminor(inode);
1016 struct fb_info *info;
1019 info = registered_fb[fbidx];
1020 if (info->fbops->fb_release)
1021 info->fbops->fb_release(info,1);
1022 module_put(info->fbops->owner);
1027 static struct file_operations fb_fops = {
1028 .owner = THIS_MODULE,
1032 #ifdef CONFIG_COMPAT
1033 .compat_ioctl = fb_compat_ioctl,
1037 .release = fb_release,
1038 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1039 .get_unmapped_area = get_fb_unmapped_area,
1043 static struct class_simple *fb_class;
1046 * register_framebuffer - registers a frame buffer device
1047 * @fb_info: frame buffer info structure
1049 * Registers a frame buffer device @fb_info.
1051 * Returns negative errno on error, or zero for success.
1056 register_framebuffer(struct fb_info *fb_info)
1059 struct fb_event event;
1061 if (num_registered_fb == FB_MAX)
1063 num_registered_fb++;
1064 for (i = 0 ; i < FB_MAX; i++)
1065 if (!registered_fb[i])
1069 fb_info->class_device = class_simple_device_add(fb_class, MKDEV(FB_MAJOR, i),
1070 fb_info->device, "fb%d", i);
1071 if (IS_ERR(fb_info->class_device)) {
1073 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1074 fb_info->class_device = NULL;
1076 fb_init_class_device(fb_info);
1078 if (fb_info->pixmap.addr == NULL) {
1079 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1080 if (fb_info->pixmap.addr) {
1081 fb_info->pixmap.size = FBPIXMAPSIZE;
1082 fb_info->pixmap.buf_align = 1;
1083 fb_info->pixmap.scan_align = 1;
1084 fb_info->pixmap.access_align = 4;
1085 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1088 fb_info->pixmap.offset = 0;
1090 if (!fb_info->modelist.prev ||
1091 !fb_info->modelist.next ||
1092 list_empty(&fb_info->modelist)) {
1093 struct fb_videomode mode;
1095 INIT_LIST_HEAD(&fb_info->modelist);
1096 fb_var_to_videomode(&mode, &fb_info->var);
1097 fb_add_videomode(&mode, &fb_info->modelist);
1100 registered_fb[i] = fb_info;
1102 devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1103 S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1104 event.info = fb_info;
1105 notifier_call_chain(&fb_notifier_list,
1106 FB_EVENT_FB_REGISTERED, &event);
1112 * unregister_framebuffer - releases a frame buffer device
1113 * @fb_info: frame buffer info structure
1115 * Unregisters a frame buffer device @fb_info.
1117 * Returns negative errno on error, or zero for success.
1122 unregister_framebuffer(struct fb_info *fb_info)
1127 if (!registered_fb[i])
1129 devfs_remove("fb/%d", i);
1131 if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1132 kfree(fb_info->pixmap.addr);
1133 fb_destroy_modelist(&fb_info->modelist);
1134 registered_fb[i]=NULL;
1135 num_registered_fb--;
1136 fb_cleanup_class_device(fb_info);
1137 class_simple_device_remove(MKDEV(FB_MAJOR, i));
1142 * fb_register_client - register a client notifier
1143 * @nb: notifier block to callback on events
1145 int fb_register_client(struct notifier_block *nb)
1147 return notifier_chain_register(&fb_notifier_list, nb);
1151 * fb_unregister_client - unregister a client notifier
1152 * @nb: notifier block to callback on events
1154 int fb_unregister_client(struct notifier_block *nb)
1156 return notifier_chain_unregister(&fb_notifier_list, nb);
1160 * fb_set_suspend - low level driver signals suspend
1161 * @info: framebuffer affected
1162 * @state: 0 = resuming, !=0 = suspending
1164 * This is meant to be used by low level drivers to
1165 * signal suspend/resume to the core & clients.
1166 * It must be called with the console semaphore held
1168 void fb_set_suspend(struct fb_info *info, int state)
1170 struct fb_event event;
1174 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1175 info->state = FBINFO_STATE_SUSPENDED;
1177 info->state = FBINFO_STATE_RUNNING;
1178 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1183 * fbmem_init - init frame buffer subsystem
1185 * Initialize the frame buffer subsystem.
1187 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1194 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1197 if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1198 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1200 fb_class = class_simple_create(THIS_MODULE, "graphics");
1201 if (IS_ERR(fb_class)) {
1202 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1209 module_init(fbmem_init);
1213 class_simple_destroy(fb_class);
1216 module_exit(fbmem_exit);
1217 MODULE_LICENSE("GPL");
1218 MODULE_DESCRIPTION("Framebuffer base");
1220 subsys_initcall(fbmem_init);
1223 int fb_new_modelist(struct fb_info *info)
1225 struct fb_event event;
1226 struct fb_var_screeninfo var = info->var;
1227 struct list_head *pos, *n;
1228 struct fb_modelist *modelist;
1229 struct fb_videomode *m, mode;
1232 list_for_each_safe(pos, n, &info->modelist) {
1233 modelist = list_entry(pos, struct fb_modelist, list);
1234 m = &modelist->mode;
1235 fb_videomode_to_var(&var, m);
1236 var.activate = FB_ACTIVATE_TEST;
1237 err = fb_set_var(info, &var);
1238 fb_var_to_videomode(&mode, &var);
1239 if (err || !fb_mode_is_equal(m, &mode)) {
1247 if (!list_empty(&info->modelist)) {
1249 err = notifier_call_chain(&fb_notifier_list,
1250 FB_EVENT_NEW_MODELIST,
1257 static char *video_options[FB_MAX];
1260 extern const char *global_mode_option;
1263 * fb_get_options - get kernel boot parameters
1264 * @name: framebuffer name as it would appear in
1265 * the boot parameter line
1266 * (video=<name>:<options>)
1267 * @option: the option will be stored here
1269 * NOTE: Needed to maintain backwards compatibility
1271 int fb_get_options(char *name, char **option)
1273 char *opt, *options = NULL;
1274 int opt_len, retval = 0;
1275 int name_len = strlen(name), i;
1277 if (name_len && ofonly && strncmp(name, "offb", 4))
1280 if (name_len && !retval) {
1281 for (i = 0; i < FB_MAX; i++) {
1282 if (video_options[i] == NULL)
1284 opt_len = strlen(video_options[i]);
1287 opt = video_options[i];
1288 if (!strncmp(name, opt, name_len) &&
1289 opt[name_len] == ':')
1290 options = opt + name_len + 1;
1293 if (options && !strncmp(options, "off", 3))
1303 * video_setup - process command line options
1304 * @options: string of options
1306 * Process command line options for frame buffer subsystem.
1308 * NOTE: This function is a __setup and __init function.
1309 * It only stores the options. Drivers have to call
1310 * fb_get_options() as necessary.
1315 int __init video_setup(char *options)
1319 if (!options || !*options)
1322 if (!global && !strncmp(options, "ofonly", 6)) {
1327 if (!global && !strstr(options, "fb:")) {
1328 global_mode_option = options;
1333 for (i = 0; i < FB_MAX; i++) {
1334 if (video_options[i] == NULL) {
1335 video_options[i] = options;
1344 __setup("video=", video_setup);
1347 * Visible symbols for modules
1350 EXPORT_SYMBOL(register_framebuffer);
1351 EXPORT_SYMBOL(unregister_framebuffer);
1352 EXPORT_SYMBOL(num_registered_fb);
1353 EXPORT_SYMBOL(registered_fb);
1354 EXPORT_SYMBOL(fb_prepare_logo);
1355 EXPORT_SYMBOL(fb_show_logo);
1356 EXPORT_SYMBOL(fb_set_var);
1357 EXPORT_SYMBOL(fb_blank);
1358 EXPORT_SYMBOL(fb_pan_display);
1359 EXPORT_SYMBOL(fb_get_buffer_offset);
1360 EXPORT_SYMBOL(fb_iomove_buf_unaligned);
1361 EXPORT_SYMBOL(fb_iomove_buf_aligned);
1362 EXPORT_SYMBOL(fb_sysmove_buf_unaligned);
1363 EXPORT_SYMBOL(fb_sysmove_buf_aligned);
1364 EXPORT_SYMBOL(fb_set_suspend);
1365 EXPORT_SYMBOL(fb_register_client);
1366 EXPORT_SYMBOL(fb_unregister_client);
1367 EXPORT_SYMBOL(fb_get_options);
1368 EXPORT_SYMBOL(fb_new_modelist);
1370 MODULE_LICENSE("GPL");