patch-2.1.124 linux/drivers/video/fbmem.c

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diff -u --recursive --new-file v2.1.123/linux/drivers/video/fbmem.c linux/drivers/video/fbmem.c
@@ -0,0 +1,690 @@
+/*
+ *  linux/drivers/video/fbmem.c
+ *
+ *  Copyright (C) 1994 Martin Schaller
+ *
+ * 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/config.h>
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/malloc.h>
+#include <linux/mman.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/console_struct.h>
+#include <linux/init.h>
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+#endif
+#ifdef CONFIG_KMOD
+#include <linux/kmod.h>
+#endif
+
+#ifdef __mc68000__
+#include <asm/setup.h>
+#endif
+#ifdef __powerpc__
+#include <asm/io.h>
+#endif
+#include <asm/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+#include <linux/fb.h>
+
+
+    /*
+     *  Frame buffer device initialization and setup routines
+     */
+
+extern unsigned long acornfb_init(void);
+extern void acornfb_setup(char *options, int *ints);
+extern void amifb_init(void);
+extern void amifb_setup(char *options, int *ints);
+extern void atafb_init(void);
+extern void atafb_setup(char *options, int *ints);
+extern void macfb_init(void);
+extern void macfb_setup(char *options, int *ints);
+extern void cyberfb_init(void);
+extern void cyberfb_setup(char *options, int *ints);
+extern void retz3fb_init(void);
+extern void retz3fb_setup(char *options, int *ints);
+extern void clgenfb_init(void);
+extern void clgenfb_setup(char *options, int *ints);
+extern void vfb_init(void);
+extern void vfb_setup(char *options, int *ints);
+extern void offb_init(void);
+extern void offb_setup(char *options, int *ints);
+extern void atyfb_init(void);
+extern void atyfb_setup(char *options, int *ints);
+extern void imsttfb_init(void);
+extern void dnfb_init(void);
+extern void tgafb_init(void);
+extern void virgefb_init(void);
+extern void virgefb_setup(char *options, int *ints);
+extern void resolver_video_setup(char *options, int *ints);
+extern void s3triofb_init(void);
+extern void s3triofb_setup(char *options, int *ints);
+extern void vesafb_init(void);
+extern void vesafb_setup(char *options, int *ints);
+extern void hpfb_init(void);
+extern void hpfb_setup(char *options, int *ints);
+extern void sbusfb_init(void);
+extern void sbusfb_setup(char *options, int *ints);
+extern void valkyriefb_init(void);
+extern void valkyriefb_setup(char *options, int *ints);
+extern void g364fb_init(void);
+
+static struct {
+	const char *name;
+	void (*init)(void);
+	void (*setup)(char *options, int *ints);
+} fb_drivers[] __initdata = {
+#ifdef CONFIG_FB_RETINAZ3
+	{ "retz3", retz3fb_init, retz3fb_setup },
+#endif
+#ifdef CONFIG_FB_ACORN
+	{ "acorn", acornfb_init, acornfb_setup },
+#endif
+#ifdef CONFIG_FB_AMIGA
+	{ "amifb", amifb_init, amifb_setup },
+#endif
+#ifdef CONFIG_FB_ATARI
+	{ "atafb", atafb_init, atafb_setup },
+#endif
+#ifdef CONFIG_FB_MAC
+	{ "macfb", macfb_init, macfb_setup },
+#endif
+#ifdef CONFIG_FB_CYBER
+	{ "cyber", cyberfb_init, cyberfb_setup },
+#endif
+#ifdef CONFIG_FB_CLGEN
+	{ "clgen", clgenfb_init, clgenfb_setup },
+#endif
+#ifdef CONFIG_FB_OF
+	{ "offb", offb_init, offb_setup },
+#endif
+#ifdef CONFIG_FB_ATY
+	{ "atyfb", atyfb_init, atyfb_setup },
+#endif
+#ifdef CONFIG_FB_IMSTT
+	{ "imsttfb", imsttfb_init, NULL },
+#endif
+#ifdef CONFIG_APOLLO
+	{ "apollo", dnfb_init, NULL },
+#endif
+#ifdef CONFIG_FB_S3TRIO
+	{ "s3trio", s3triofb_init, s3triofb_setup },
+#endif 
+#ifdef CONFIG_FB_TGA
+	{ "tga", tgafb_init, NULL },
+#endif
+#ifdef CONFIG_FB_VIRGE
+	{ "virge", virgefb_init, virgefb_setup },
+#endif
+#ifdef CONFIG_FB_VESA
+	{ "vesa", vesafb_init, vesafb_setup },
+#endif 
+#ifdef CONFIG_FB_HP300
+	{ "hpfb", hpfb_init, hpfb_setup },
+#endif 
+#ifdef CONFIG_FB_SBUS
+	{ "sbus", sbusfb_init, sbusfb_setup },
+#endif
+#ifdef CONFIG_FB_VALKYRIE
+	{ "valkyriefb", valkyriefb_init, valkyriefb_setup },
+#endif
+#ifdef CONFIG_FB_G364
+	{ "g364", g364fb_init, NULL },
+#endif
+#ifdef CONFIG_GSP_RESOLVER
+	/* Not a real frame buffer device... */
+	{ "resolver", NULL, resolver_video_setup },
+#endif
+#ifdef CONFIG_FB_VIRTUAL
+	/* Must be last to avoid that vfb becomes your primary display */
+	{ "vfb", vfb_init, vfb_setup },
+#endif
+};
+
+#define NUM_FB_DRIVERS	(sizeof(fb_drivers)/sizeof(*fb_drivers))
+
+static void (*pref_init_funcs[FB_MAX])(void);
+static int num_pref_init_funcs __initdata = 0;
+
+
+#define GET_INODE(i) MKDEV(FB_MAJOR, (i) << FB_MODES_SHIFT)
+#define GET_FB_VAR_IDX(node) (MINOR(node) & ((1 << FB_MODES_SHIFT)-1)) 
+
+struct fb_info *registered_fb[FB_MAX];
+int num_registered_fb = 0;
+
+char con2fb_map[MAX_NR_CONSOLES];
+
+static int first_fb_vc = 0;
+static int last_fb_vc = MAX_NR_CONSOLES-1;
+static int fbcon_is_default = 1;
+
+static inline int PROC_CONSOLE(void)
+{
+	if (!current->tty)
+		return fg_console;
+
+	if (current->tty->driver.type != TTY_DRIVER_TYPE_CONSOLE)
+		/* XXX Should report error here? */
+		return fg_console;
+
+	if (MINOR(current->tty->device) < 1)
+		return fg_console;
+
+	return MINOR(current->tty->device) - 1;
+}
+
+#ifdef CONFIG_PROC_FS
+static int fbmem_read_proc(char *buf, char **start, off_t offset,
+			   int len, int *eof, void *private)
+{
+	struct fb_info **fi;
+
+	len = 0;
+	for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
+		if (*fi)
+			len += sprintf(buf + len, "%d %s\n",
+				       GET_FB_IDX((*fi)->node),
+				       (*fi)->modename);
+	*start = buf + offset;
+	return len > offset ? len - offset : 0;
+}
+#endif
+
+static ssize_t
+fb_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+	unsigned long p = *ppos;
+	struct inode *inode = file->f_dentry->d_inode;
+	int fbidx = GET_FB_IDX(inode->i_rdev);
+	struct fb_info *info = registered_fb[fbidx];
+	struct fb_ops *fb = info->fbops;
+	struct fb_fix_screeninfo fix;
+	char *base_addr;
+	ssize_t copy_size;
+
+	if (! fb || ! info->disp)
+		return -ENODEV;
+
+	fb->fb_get_fix(&fix,PROC_CONSOLE(), info);
+	base_addr=info->disp->screen_base;
+	copy_size=(count + p <= fix.smem_len ? count : fix.smem_len - p);
+	if (copy_to_user(buf, base_addr+p, copy_size))
+	    return -EFAULT;
+	*ppos += copy_size;
+	return copy_size;
+}
+
+static ssize_t
+fb_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+{
+	unsigned long p = *ppos;
+	struct inode *inode = file->f_dentry->d_inode;
+	int fbidx = GET_FB_IDX(inode->i_rdev);
+	struct fb_info *info = registered_fb[fbidx];
+	struct fb_ops *fb = info->fbops;
+	struct fb_fix_screeninfo fix;
+	char *base_addr;
+	ssize_t copy_size;
+
+	if (! fb || ! info->disp)
+		return -ENODEV;
+
+	fb->fb_get_fix(&fix, PROC_CONSOLE(), info);
+	base_addr=info->disp->screen_base;
+	copy_size=(count + p <= fix.smem_len ? count : fix.smem_len - p);
+	if (copy_from_user(base_addr+p, buf, copy_size))
+	    return -EFAULT;
+	file->f_pos += copy_size;
+	return copy_size;
+}
+
+
+static void set_con2fb_map(int unit, int newidx)
+{
+    int oldidx = con2fb_map[unit];
+    struct fb_info *oldfb, *newfb;
+    struct vc_data *conp;
+    char *fontdata;
+    unsigned short fontwidth, fontheight, fontwidthlog, fontheightlog;
+    int userfont;
+
+    if (newidx != con2fb_map[unit]) {
+       oldfb = registered_fb[oldidx];
+       newfb = registered_fb[newidx];
+       if (newfb->fbops->fb_open(newfb,0))
+	   return;
+       oldfb->fbops->fb_release(oldfb,0);
+       conp = fb_display[unit].conp;
+       fontdata = fb_display[unit].fontdata;
+       fontwidth = fb_display[unit]._fontwidth;
+       fontheight = fb_display[unit]._fontheight;
+       fontwidthlog = fb_display[unit]._fontwidthlog;
+       fontheightlog = fb_display[unit]._fontheightlog;
+       userfont = fb_display[unit].userfont;
+       con2fb_map[unit] = newidx;
+       fb_display[unit] = *(newfb->disp);
+       fb_display[unit].conp = conp;
+       fb_display[unit].fontdata = fontdata;
+       fb_display[unit]._fontwidth = fontwidth;
+       fb_display[unit]._fontheight = fontheight;
+       fb_display[unit]._fontwidthlog = fontwidthlog;
+       fb_display[unit]._fontheightlog = fontheightlog;
+       fb_display[unit].userfont = userfont;
+       fb_display[unit].fb_info = newfb;
+       if (!newfb->changevar)
+	   newfb->changevar = oldfb->changevar;
+       /* tell console var has changed */
+       if (newfb->changevar)
+	   newfb->changevar(unit);
+    }
+}
+
+#ifdef CONFIG_KMOD
+static void try_to_load(int fb)
+{
+	char modname[16];
+
+	sprintf(modname, "fb%d", fb);
+	request_module(modname);
+}
+#endif /* CONFIG_KMOD */
+
+static int 
+fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	 unsigned long arg)
+{
+	int fbidx = GET_FB_IDX(inode->i_rdev);
+	struct fb_info *info = registered_fb[fbidx];
+	struct fb_ops *fb = info->fbops;
+	struct fb_cmap cmap;
+	struct fb_var_screeninfo var;
+	struct fb_fix_screeninfo fix;
+	struct fb_con2fbmap con2fb;
+	int i;
+	
+	if (! fb)
+		return -ENODEV;
+	switch (cmd) {
+	case FBIOGET_VSCREENINFO:
+		if ((i = fb->fb_get_var(&var, PROC_CONSOLE(), info)))
+			return i;
+		return copy_to_user((void *) arg, &var,
+				    sizeof(var)) ? -EFAULT : 0;
+	case FBIOPUT_VSCREENINFO:
+		if (copy_from_user(&var, (void *) arg, sizeof(var)))
+			return -EFAULT;
+		if ((i = fb->fb_set_var(&var, PROC_CONSOLE(), info)))
+			return i;
+		if (copy_to_user((void *) arg, &var, sizeof(var)))
+			return -EFAULT;
+		return 0;
+	case FBIOGET_FSCREENINFO:
+		if ((i = fb->fb_get_fix(&fix, PROC_CONSOLE(), info)))
+			return i;
+		return copy_to_user((void *) arg, &fix, sizeof(fix)) ?
+			-EFAULT : 0;
+	case FBIOPUTCMAP:
+		if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
+			return -EFAULT;
+		return (fb->fb_set_cmap(&cmap, 0, PROC_CONSOLE(), info));
+	case FBIOGETCMAP:
+		if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
+			return -EFAULT;
+		return (fb->fb_get_cmap(&cmap, 0, PROC_CONSOLE(), info));
+	case FBIOPAN_DISPLAY:
+		if (copy_from_user(&var, (void *) arg, sizeof(var)))
+			return -EFAULT;
+		if ((i=fb->fb_pan_display(&var, PROC_CONSOLE(), info)))
+			return i;
+		if (copy_to_user((void *) arg, &var, sizeof(var)))
+			return -EFAULT;
+		return i;
+	case FBIOGET_CON2FBMAP:
+		if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb)))
+			return -EFAULT;
+		if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
+		    return -EINVAL;
+		con2fb.framebuffer = con2fb_map[con2fb.console-1];
+		return copy_to_user((void *)arg, &con2fb,
+				    sizeof(con2fb)) ? -EFAULT : 0;
+	case FBIOPUT_CON2FBMAP:
+		if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb)))
+			return - EFAULT;
+		if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
+		    return -EINVAL;
+		if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
+		    return -EINVAL;
+#ifdef CONFIG_KMOD
+		if (!registered_fb[con2fb.framebuffer])
+		    try_to_load(con2fb.framebuffer);
+#endif /* CONFIG_KMOD */
+		if (!registered_fb[con2fb.framebuffer])
+		    return -EINVAL;
+		if (con2fb.console != 0)
+		    set_con2fb_map(con2fb.console-1, con2fb.framebuffer);
+		else
+		    /* set them all */
+		    for (i = 0; i < MAX_NR_CONSOLES; i++)
+			set_con2fb_map(i, con2fb.framebuffer);
+		return 0;
+	default:
+		return fb->fb_ioctl(inode, file, cmd, arg, PROC_CONSOLE(),
+				    info);
+	}
+}
+
+static int 
+fb_mmap(struct file *file, struct vm_area_struct * vma)
+{
+	int fbidx = GET_FB_IDX(file->f_dentry->d_inode->i_rdev);
+	struct fb_info *info = registered_fb[fbidx];
+	struct fb_ops *fb = info->fbops;
+	struct fb_fix_screeninfo fix;
+	struct fb_var_screeninfo var;
+	unsigned long start;
+	u32 len;
+
+	if (!fb)
+		return -ENODEV;
+	if (fb->fb_mmap)
+		return fb->fb_mmap(info, file, vma);
+	fb->fb_get_fix(&fix, PROC_CONSOLE(), info);
+
+	/* frame buffer memory */
+	start = (unsigned long)fix.smem_start;
+	len = (start & ~PAGE_MASK)+fix.smem_len;
+	start &= PAGE_MASK;
+	len = (len+~PAGE_MASK) & PAGE_MASK;
+	if (vma->vm_offset >= len) {
+		/* memory mapped io */
+		vma->vm_offset -= len;
+		fb->fb_get_var(&var, PROC_CONSOLE(), info);
+		if (var.accel_flags)
+			return -EINVAL;
+		start = (unsigned long)fix.mmio_start;
+		len = (start & ~PAGE_MASK)+fix.mmio_len;
+		start &= PAGE_MASK;
+		len = (len+~PAGE_MASK) & PAGE_MASK;
+	}
+	if ((vma->vm_end - vma->vm_start + vma->vm_offset) > len)
+		return -EINVAL;
+	vma->vm_offset += start;
+	if (vma->vm_offset & ~PAGE_MASK)
+		return -ENXIO;
+#if defined(__mc68000__)
+	if (CPU_IS_020_OR_030)
+		pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
+	if (CPU_IS_040_OR_060) {
+		pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
+		/* Use no-cache mode, serialized */
+		pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
+	}
+#elif defined(__powerpc__)
+	pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
+#elif defined(__alpha__)
+	/* Caching is off in the I/O space quadrant by design.  */
+#elif defined(__sparc__)
+	/* Should never get here, all fb drivers should have their own
+	   mmap routines */
+#elif defined(__i386__)
+	if (boot_cpu_data.x86 > 3)
+		pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
+#elif defined(__mips__)
+	pgprot_val(vma->vm_page_prot) &= ~_CACHE_MASK;
+	pgprot_val(vma->vm_page_prot) |= _CACHE_UNCACHED;
+#else
+#warning What do we have to do here??
+#endif
+	if (remap_page_range(vma->vm_start, vma->vm_offset,
+			     vma->vm_end - vma->vm_start, vma->vm_page_prot))
+		return -EAGAIN;
+	vma->vm_file = file;
+	file->f_count++;
+	return 0;
+}
+
+static int
+fb_open(struct inode *inode, struct file *file)
+{
+	int fbidx = GET_FB_IDX(inode->i_rdev);
+	struct fb_info *info;
+
+#ifdef CONFIG_KMOD
+	if (!(info = registered_fb[fbidx]))
+		try_to_load(fbidx);
+#endif /* CONFIG_KMOD */
+	if (!(info = registered_fb[fbidx]))
+		return -ENODEV;
+	return info->fbops->fb_open(info,1);
+}
+
+static int 
+fb_release(struct inode *inode, struct file *file)
+{
+	int fbidx = GET_FB_IDX(inode->i_rdev);
+	struct fb_info *info = registered_fb[fbidx];
+
+	info->fbops->fb_release(info,1);
+	return 0;
+}
+
+static struct file_operations fb_fops = {
+	NULL,		/* lseek	*/
+	fb_read,	/* read		*/
+	fb_write,	/* write	*/
+	NULL,		/* readdir 	*/
+	NULL,		/* poll 	*/
+	fb_ioctl,	/* ioctl 	*/
+	fb_mmap,	/* mmap		*/
+	fb_open,	/* open 	*/
+	NULL,		/* flush	*/
+	fb_release,	/* release 	*/
+	NULL		/* fsync 	*/
+};
+
+int
+register_framebuffer(struct fb_info *fb_info)
+{
+	int i, j;
+	static int fb_ever_opened[FB_MAX];
+	static int first = 1;
+
+	if (num_registered_fb == FB_MAX)
+		return -ENXIO;
+	num_registered_fb++;
+	for (i = 0 ; i < FB_MAX; i++)
+		if (!registered_fb[i])
+			break;
+	fb_info->node=GET_INODE(i);
+	registered_fb[i] = fb_info;
+	if (!fb_ever_opened[i]) {
+		/*
+		 *  We assume initial frame buffer devices can be opened this
+		 *  many times
+		 */
+		for (j = 0; j < MAX_NR_CONSOLES; j++)
+			if (con2fb_map[j] == i)
+				fb_info->fbops->fb_open(fb_info,0);
+		fb_ever_opened[i] = 1;
+	}
+
+	if (first) {
+		first = 0;
+		take_over_console(&fb_con, first_fb_vc, last_fb_vc, fbcon_is_default);
+	}
+
+	return 0;
+}
+
+int
+unregister_framebuffer(const struct fb_info *fb_info)
+{
+	int i, j;
+
+	i = GET_FB_IDX(fb_info->node);
+	for (j = 0; j < MAX_NR_CONSOLES; j++)
+		if (con2fb_map[j] == i)
+			return -EBUSY;
+	if (!registered_fb[i])
+		return -EINVAL; 
+	registered_fb[i]=NULL;
+	num_registered_fb--;
+	return 0;
+}
+
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry *proc_fbmem;
+#endif
+
+__initfunc(void
+fbmem_init(void))
+{
+	int i;
+
+#ifdef CONFIG_PROC_FS
+	proc_fbmem = create_proc_entry("fb", 0, 0);
+	if (proc_fbmem)
+		proc_fbmem->read_proc = fbmem_read_proc;
+#endif
+
+	if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
+		printk("unable to get major %d for fb devs\n", FB_MAJOR);
+
+	/*
+	 *  Probe for all builtin frame buffer devices
+	 */
+	for (i = 0; i < num_pref_init_funcs; i++)
+		pref_init_funcs[i]();
+
+	for (i = 0; i < NUM_FB_DRIVERS; i++)
+		if (fb_drivers[i].init)
+			fb_drivers[i].init();
+}
+
+
+int fbmon_valid_timings(u_int pixclock, u_int htotal, u_int vtotal,
+			const struct fb_info *fb_info)
+{
+#if 0
+	/*
+	 * long long divisions .... $#%%#$ 
+	 */
+    unsigned long long hpicos, vpicos;
+    const unsigned long long _1e12 = 1000000000000ULL;
+    const struct fb_monspecs *monspecs = &fb_info->monspecs;
+
+    hpicos = (unsigned long long)htotal*(unsigned long long)pixclock;
+    vpicos = (unsigned long long)vtotal*(unsigned long long)hpicos;
+    if (!vpicos)
+	return 0;
+
+    if (monspecs->hfmin == 0)
+	return 1;
+
+    if (hpicos*monspecs->hfmin > _1e12 || hpicos*monspecs->hfmax < _1e12 ||
+	vpicos*monspecs->vfmin > _1e12 || vpicos*monspecs->vfmax < _1e12)
+	return 0;
+#endif
+    return 1;
+}
+
+int fbmon_dpms(const struct fb_info *fb_info)
+{
+    return fb_info->monspecs.dpms;
+}
+
+
+    /*
+     *  Command line options
+     */
+
+__initfunc(void video_setup(char *options, int *ints))
+{
+    int i, j;
+
+    if (!options || !*options)
+	    return;
+	    
+    if (!strncmp(options, "map:", 4)) {
+	    options += 4;
+	    if (*options)
+		    for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
+			    if (!options[j])
+				    j = 0;
+			    con2fb_map[i] = (options[j++]-'0') % FB_MAX;
+		    }
+	    return;
+    }
+
+    if (!strncmp(options, "vc:", 3)) {
+	    options += 3;
+	    if (*options)
+		first_fb_vc = simple_strtoul(options, &options, 10) - 1;
+	    if (first_fb_vc < 0)
+		first_fb_vc = 0;
+	    if (*options++ == '-')
+		last_fb_vc = simple_strtoul(options, &options, 10) - 1;
+	    fbcon_is_default = 0;
+    }
+
+    if (num_pref_init_funcs == FB_MAX)
+	    return;
+
+    for (i = 0; i < NUM_FB_DRIVERS; i++) {
+	    j = strlen(fb_drivers[i].name);
+	    if (!strncmp(options, fb_drivers[i].name, j) &&
+		options[j] == ':') {
+		    if (!strcmp(options+j+1, "off"))
+			    fb_drivers[i].init = NULL;
+		    else {
+			    if (fb_drivers[i].init) {
+				    pref_init_funcs[num_pref_init_funcs++] =
+					    fb_drivers[i].init;
+				    fb_drivers[i].init = NULL;
+			    }
+			    if (fb_drivers[i].setup)
+				    fb_drivers[i].setup(options+j+1, ints);
+		    }
+		    return;
+	    }
+    }
+    /*
+     * If we get here no fb was specified and we default to pass the
+     * options to the first frame buffer that has an init and a setup
+     * function.
+     */
+    for (i = 0; i < NUM_FB_DRIVERS; i++) {
+	    if (fb_drivers[i].init && fb_drivers[i].setup) {
+		    pref_init_funcs[num_pref_init_funcs++] =
+			    fb_drivers[i].init;
+		    fb_drivers[i].init = NULL;
+
+		    fb_drivers[i].setup(options, ints);
+		    return;
+	    }
+    }
+}
+
+
+    /*
+     *  Visible symbols for modules
+     */
+
+EXPORT_SYMBOL(register_framebuffer);
+EXPORT_SYMBOL(unregister_framebuffer);
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TCL-scripts by Sam Shen, slshen@lbl.gov