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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [mem.c] - Blame information for rev 1765

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/*
 *  linux/drivers/char/mem.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 */
 
/*
 * uClinux revisions for NO_MM
 * Copyright (C) 1998  Kenneth Albanowski <kjahds@kjahds.com>,
 *                     The Silver Hammer Group, Ltd.
 */
 
#include <linux/config.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/tty.h>
#include <linux/miscdevice.h>
#include <linux/tpqic02.h>
#include <linux/ftape.h>
#include <linux/malloc.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/random.h>
 
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/pgtable.h>
 
#ifdef CONFIG_SOUND
void soundcard_init(void);
#endif
#ifdef CONFIG_ISDN
void isdn_init(void);
#endif
#ifdef CONFIG_PCWATCHDOG
void pcwatchdog_init(void);
#endif
 
static int read_ram(struct inode * inode, struct file * file, char * buf, int count)
{
        return -EIO;
}
 
static int write_ram(struct inode * inode, struct file * file, const char * buf, int count)
{
        return -EIO;
}
 
static int read_mem(struct inode * inode, struct file * file, char * buf, int count)
{
        unsigned long p = file->f_pos;
        int read;
 
        p += PAGE_OFFSET;
        if (count < 0)
                return -EINVAL;
        if (MAP_NR(p) >= MAP_NR(high_memory))
                return 0;
        if (count > high_memory - p)
                count = high_memory - p;
        read = 0;
#if defined(__i386__) || defined(__sparc__) /* we don't have page 0 mapped on x86/sparc.. */
        while (p < PAGE_OFFSET + PAGE_SIZE && count > 0) {
                put_user(0,buf);
                buf++;
                p++;
                count--;
                read++;
        }
#endif
        memcpy_tofs(buf, (void *) p, count);
        read += count;
        file->f_pos += read;
        return read;
}
 
static int write_mem(struct inode * inode, struct file * file, const char * buf, int count)
{
        unsigned long p = file->f_pos;
        int written;
 
        p += PAGE_OFFSET;
        if (count < 0)
                return -EINVAL;
        if (MAP_NR(p) >= MAP_NR(high_memory))
                return 0;
        if (count > high_memory - p)
                count = high_memory - p;
        written = 0;
#if defined(__i386__) || defined(__sparc__) /* we don't have page 0 mapped on x86/sparc.. */
        while (PAGE_OFFSET + p < PAGE_SIZE && count > 0) {
                /* Hmm. Do something? */
                buf++;
                p++;
                count--;
                written++;
        }
#endif
        memcpy_fromfs((void *) p, buf, count);
        written += count;
        file->f_pos += written;
        return count;
}
 
static int mmap_mem(struct inode * inode, struct file * file, struct vm_area_struct * vma)
{
#ifndef NO_MM
        if (vma->vm_offset & ~PAGE_MASK)
                return -ENXIO;
#if defined(__i386__)
        /*
         * hmm.. This disables high-memory caching, as the XFree86 team
         * wondered about that at one time.
         * The surround logic should disable caching for the high device
         * addresses anyway, but right now this seems still needed.
         */
        if (x86 > 3 && vma->vm_offset >= high_memory)
                pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
#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_inode = inode;
        inode->i_count++;
#else /* !NO_MM */
        vma->vm_start = file->f_pos+PAGE_OFFSET+vma->vm_offset;
#endif /* !NO_MM */
        return 0;
}
 
static int read_kmem(struct inode *inode, struct file *file, char *buf, int count)
{
        int read1, read2;
 
        read1 = read_mem(inode, file, buf, count);
        if (read1 < 0)
                return read1;
        read2 = vread(buf + read1, (char *) ((unsigned long) file->f_pos), count - read1);
        if (read2 < 0)
                return read2;
        file->f_pos += read2;
        return read1 + read2;
}
 
static int read_port(struct inode * inode, struct file * file,char * buf, int count)
{
        unsigned int i = file->f_pos;
        char * tmp = buf;
 
        while (count-- > 0 && i < 65536) {
                put_user(inb(i),tmp);
                i++;
                tmp++;
        }
        file->f_pos = i;
        return tmp-buf;
}
 
static int write_port(struct inode * inode, struct file * file, const char * buf, int count)
{
        unsigned int i = file->f_pos;
        const char * tmp = buf;
 
        while (count-- > 0 && i < 65536) {
                outb(get_user(tmp),i);
                i++;
                tmp++;
        }
        file->f_pos = i;
        return tmp-buf;
}
 
static int read_null(struct inode * node, struct file * file, char * buf, int count)
{
        return 0;
}
 
static int write_null(struct inode * inode, struct file * file, const char * buf, int count)
{
        return count;
}
 
static int read_zero(struct inode * node, struct file * file, char * buf, int count)
{
        int left;
 
        for (left = count; left > 0; left--) {
                put_user(0,buf);
                buf++;
                if (need_resched)
                        schedule();
        }
        return count;
}
 
static int mmap_zero(struct inode * inode, struct file * file, struct vm_area_struct * vma)
{
#ifndef NO_MM
        if (vma->vm_flags & VM_SHARED)
                return -EINVAL;
        if (zeromap_page_range(vma->vm_start, vma->vm_end - vma->vm_start, vma->vm_page_prot))
                return -EAGAIN;
        return 0;
#else /* !NO_MM */
        /* FIXME: trivial calloc() implementation is feasible */
        return -ENOSYS;
#endif /* !NO_MM */
}
 
static int write_full(struct inode * inode, struct file * file, const char * buf, int count)
{
        return -ENOSPC;
}
 
/*
 * Special lseek() function for /dev/null and /dev/zero.  Most notably, you can fopen()
 * both devices with "a" now.  This was previously impossible.  SRB.
 */
 
static int null_lseek(struct inode * inode, struct file * file, off_t offset, int orig)
{
        return file->f_pos=0;
}
/*
 * The memory devices use the full 32/64 bits of the offset, and so we cannot
 * check against negative addresses: they are ok. The return value is weird,
 * though, in that case (0).
 *
 * also note that seeking relative to the "end of file" isn't supported:
 * it has no meaning, so it returns -EINVAL.
 */
static int memory_lseek(struct inode * inode, struct file * file, off_t offset, int orig)
{
        switch (orig) {
                case 0:
                        file->f_pos = offset;
                        return file->f_pos;
                case 1:
                        file->f_pos += offset;
                        return file->f_pos;
                default:
                        return -EINVAL;
        }
        if (file->f_pos < 0)
                return 0;
        return file->f_pos;
}
 
#define write_kmem      write_mem
#define mmap_kmem       mmap_mem
#define zero_lseek      null_lseek
#define full_lseek      null_lseek
#define write_zero      write_null
#define read_full       read_null
 
static struct file_operations ram_fops = {
        memory_lseek,
        read_ram,
        write_ram,
        NULL,           /* ram_readdir */
        NULL,           /* ram_select */
        NULL,           /* ram_ioctl */
        NULL,           /* ram_mmap */
        NULL,           /* no special open code */
        NULL,           /* no special release code */
        NULL            /* fsync */
};
 
static struct file_operations mem_fops = {
        memory_lseek,
        read_mem,
        write_mem,
        NULL,           /* mem_readdir */
        NULL,           /* mem_select */
        NULL,           /* mem_ioctl */
        mmap_mem,
        NULL,           /* no special open code */
        NULL,           /* no special release code */
        NULL            /* fsync */
};
 
static struct file_operations kmem_fops = {
        memory_lseek,
        read_kmem,
        write_kmem,
        NULL,           /* kmem_readdir */
        NULL,           /* kmem_select */
        NULL,           /* kmem_ioctl */
        mmap_kmem,
        NULL,           /* no special open code */
        NULL,           /* no special release code */
        NULL            /* fsync */
};
 
static struct file_operations null_fops = {
        null_lseek,
        read_null,
        write_null,
        NULL,           /* null_readdir */
        NULL,           /* null_select */
        NULL,           /* null_ioctl */
        NULL,           /* null_mmap */
        NULL,           /* no special open code */
        NULL,           /* no special release code */
        NULL            /* fsync */
};
 
static struct file_operations port_fops = {
        memory_lseek,
        read_port,
        write_port,
        NULL,           /* port_readdir */
        NULL,           /* port_select */
        NULL,           /* port_ioctl */
        NULL,           /* port_mmap */
        NULL,           /* no special open code */
        NULL,           /* no special release code */
        NULL            /* fsync */
};
 
static struct file_operations zero_fops = {
        zero_lseek,
        read_zero,
        write_zero,
        NULL,           /* zero_readdir */
        NULL,           /* zero_select */
        NULL,           /* zero_ioctl */
        mmap_zero,
        NULL,           /* no special open code */
        NULL            /* no special release code */
};
 
static struct file_operations full_fops = {
        full_lseek,
        read_full,
        write_full,
        NULL,           /* full_readdir */
        NULL,           /* full_select */
        NULL,           /* full_ioctl */
        NULL,           /* full_mmap */
        NULL,           /* no special open code */
        NULL            /* no special release code */
};
 
static int memory_open(struct inode * inode, struct file * filp)
{
        switch (MINOR(inode->i_rdev)) {
                case 0:
                case 1:
                case 2:
                case 4:
                        if(securelevel>0)
                                return -EPERM;
        }
        switch (MINOR(inode->i_rdev)) {
                case 0:
                        filp->f_op = &ram_fops;
                        break;
                case 1:
                        filp->f_op = &mem_fops;
                        break;
                case 2:
                        filp->f_op = &kmem_fops;
                        break;
                case 3:
                        filp->f_op = &null_fops;
                        break;
                case 4:
                        filp->f_op = &port_fops;
                        break;
                case 5:
                        filp->f_op = &zero_fops;
                        break;
                case 7:
                        filp->f_op = &full_fops;
                        break;
                case 8:
                        filp->f_op = &random_fops;
                        break;
                case 9:
                        filp->f_op = &urandom_fops;
                        break;
                default:
                        return -ENXIO;
        }
        if (filp->f_op && filp->f_op->open)
                return filp->f_op->open(inode,filp);
        return 0;
}
 
static struct file_operations memory_fops = {
        NULL,           /* lseek */
        NULL,           /* read */
        NULL,           /* write */
        NULL,           /* readdir */
        NULL,           /* select */
        NULL,           /* ioctl */
        NULL,           /* mmap */
        memory_open,    /* just a selector for the real open */
        NULL,           /* release */
        NULL            /* fsync */
};
 
int chr_dev_init(void)
{
        if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
                printk("unable to get major %d for memory devs\n", MEM_MAJOR);
        rand_initialize();
        tty_init();
#ifdef CONFIG_PRINTER
        lp_init();
#endif
#if defined (CONFIG_BUSMOUSE) || defined(CONFIG_UMISC) || \
    defined (CONFIG_PSMOUSE) || defined (CONFIG_MS_BUSMOUSE) || \
    defined (CONFIG_ATIXL_BUSMOUSE) || defined(CONFIG_SOFT_WATCHDOG) || \
    defined (CONFIG_PCWATCHDOG) || defined (CONFIG_H8) || defined(CONFIG_WDT) || \
    defined (CONFIG_APM) || defined (CONFIG_RTC) || defined (CONFIG_SUN_MOUSE)
        misc_init();
#endif
#ifdef CONFIG_SOUND
        soundcard_init();
#endif
#if CONFIG_QIC02_TAPE
        qic02_tape_init();
#endif
#if CONFIG_ISDN
        isdn_init();
#endif
#ifdef CONFIG_FTAPE
        ftape_init();
#endif
#ifdef CONFIG_MCF_MBUS
        mbus_init();
#endif
#ifdef CONFIG_WATCHDOG
        watchdog_init();
#endif
#ifdef CONFIG_LCDTXT
        lcdtxt_init();
#endif
        return 0;
}

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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [mem.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/drivers/char/mem.c`
3			`*`
4			`* Copyright (C) 1991, 1992 Linus Torvalds`
5			`*`
6			`*/`
7
8			`/*`
9			`* uClinux revisions for NO_MM`
10			`* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,`
11			`* The Silver Hammer Group, Ltd.`
12			`*/`
13
14			`#include <linux/config.h>`
15			`#include <linux/types.h>`
16			`#include <linux/errno.h>`
17			`#include <linux/sched.h>`
18			`#include <linux/kernel.h>`
19			`#include <linux/major.h>`
20			`#include <linux/tty.h>`
21			`#include <linux/miscdevice.h>`
22			`#include <linux/tpqic02.h>`
23			`#include <linux/ftape.h>`
24			`#include <linux/malloc.h>`
25			`#include <linux/mman.h>`
26			`#include <linux/mm.h>`
27			`#include <linux/random.h>`
28
29			`#include <asm/segment.h>`
30			`#include <asm/io.h>`
31			`#include <asm/pgtable.h>`
32
33			`#ifdef CONFIG_SOUND`
34			`void soundcard_init(void);`
35			`#endif`
36			`#ifdef CONFIG_ISDN`
37			`void isdn_init(void);`
38			`#endif`
39			`#ifdef CONFIG_PCWATCHDOG`
40			`void pcwatchdog_init(void);`
41			`#endif`
42
43			`static int read_ram(struct inode * inode, struct file * file, char * buf, int count)`
44			`{`
45			`return -EIO;`
46			`}`
47
48			`static int write_ram(struct inode * inode, struct file * file, const char * buf, int count)`
49			`{`
50			`return -EIO;`
51			`}`
52
53			`static int read_mem(struct inode * inode, struct file * file, char * buf, int count)`
54			`{`
55			`unsigned long p = file->f_pos;`
56			`int read;`
57
58			`p += PAGE_OFFSET;`
59			`if (count < 0)`
60			`return -EINVAL;`
61			`if (MAP_NR(p) >= MAP_NR(high_memory))`
62			`return 0;`
63			`if (count > high_memory - p)`
64			`count = high_memory - p;`
65			`read = 0;`
66			`#if defined(__i386__) \|\| defined(__sparc__) /* we don't have page 0 mapped on x86/sparc.. */`
67			`while (p < PAGE_OFFSET + PAGE_SIZE && count > 0) {`
68			`put_user(0,buf);`
69			`buf++;`
70			`p++;`
71			`count--;`
72			`read++;`
73			`}`
74			`#endif`
75			`memcpy_tofs(buf, (void *) p, count);`
76			`read += count;`
77			`file->f_pos += read;`
78			`return read;`
79			`}`
80
81			`static int write_mem(struct inode * inode, struct file * file, const char * buf, int count)`
82			`{`
83			`unsigned long p = file->f_pos;`
84			`int written;`
85
86			`p += PAGE_OFFSET;`
87			`if (count < 0)`
88			`return -EINVAL;`
89			`if (MAP_NR(p) >= MAP_NR(high_memory))`
90			`return 0;`
91			`if (count > high_memory - p)`
92			`count = high_memory - p;`
93			`written = 0;`
94			`#if defined(__i386__) \|\| defined(__sparc__) /* we don't have page 0 mapped on x86/sparc.. */`
95			`while (PAGE_OFFSET + p < PAGE_SIZE && count > 0) {`
96			`/* Hmm. Do something? */`
97			`buf++;`
98			`p++;`
99			`count--;`
100			`written++;`
101			`}`
102			`#endif`
103			`memcpy_fromfs((void *) p, buf, count);`
104			`written += count;`
105			`file->f_pos += written;`
106			`return count;`
107			`}`
108
109			`static int mmap_mem(struct inode * inode, struct file * file, struct vm_area_struct * vma)`
110			`{`
111			`#ifndef NO_MM`
112			`if (vma->vm_offset & ~PAGE_MASK)`
113			`return -ENXIO;`
114			`#if defined(__i386__)`
115			`/*`
116			`* hmm.. This disables high-memory caching, as the XFree86 team`
117			`* wondered about that at one time.`
118			`* The surround logic should disable caching for the high device`
119			`* addresses anyway, but right now this seems still needed.`
120			`*/`
121			`if (x86 > 3 && vma->vm_offset >= high_memory)`
122			`pgprot_val(vma->vm_page_prot) \|= _PAGE_PCD;`
123			`#endif`
124			`if (remap_page_range(vma->vm_start, vma->vm_offset, vma->vm_end - vma->vm_start, vma->vm_page_prot))`
125			`return -EAGAIN;`
126			`vma->vm_inode = inode;`
127			`inode->i_count++;`
128			`#else /* !NO_MM */`
129			`vma->vm_start = file->f_pos+PAGE_OFFSET+vma->vm_offset;`
130			`#endif /* !NO_MM */`
131			`return 0;`
132			`}`
133
134			`static int read_kmem(struct inode inode, struct file file, char *buf, int count)`
135			`{`
136			`int read1, read2;`
137
138			`read1 = read_mem(inode, file, buf, count);`
139			`if (read1 < 0)`
140			`return read1;`
141			`read2 = vread(buf + read1, (char *) ((unsigned long) file->f_pos), count - read1);`
142			`if (read2 < 0)`
143			`return read2;`
144			`file->f_pos += read2;`
145			`return read1 + read2;`
146			`}`
147
148			`static int read_port(struct inode * inode, struct file * file,char * buf, int count)`
149			`{`
150			`unsigned int i = file->f_pos;`
151			`char * tmp = buf;`
152
153			`while (count-- > 0 && i < 65536) {`
154			`put_user(inb(i),tmp);`
155			`i++;`
156			`tmp++;`
157			`}`
158			`file->f_pos = i;`
159			`return tmp-buf;`
160			`}`
161
162			`static int write_port(struct inode * inode, struct file * file, const char * buf, int count)`
163			`{`
164			`unsigned int i = file->f_pos;`
165			`const char * tmp = buf;`
166
167			`while (count-- > 0 && i < 65536) {`
168			`outb(get_user(tmp),i);`
169			`i++;`
170			`tmp++;`
171			`}`
172			`file->f_pos = i;`
173			`return tmp-buf;`
174			`}`
175
176			`static int read_null(struct inode * node, struct file * file, char * buf, int count)`
177			`{`
178			`return 0;`
179			`}`
180
181			`static int write_null(struct inode * inode, struct file * file, const char * buf, int count)`
182			`{`
183			`return count;`
184			`}`
185
186			`static int read_zero(struct inode * node, struct file * file, char * buf, int count)`
187			`{`
188			`int left;`
189
190			`for (left = count; left > 0; left--) {`
191			`put_user(0,buf);`
192			`buf++;`
193			`if (need_resched)`
194			`schedule();`
195			`}`
196			`return count;`
197			`}`
198
199			`static int mmap_zero(struct inode * inode, struct file * file, struct vm_area_struct * vma)`
200			`{`
201			`#ifndef NO_MM`
202			`if (vma->vm_flags & VM_SHARED)`
203			`return -EINVAL;`
204			`if (zeromap_page_range(vma->vm_start, vma->vm_end - vma->vm_start, vma->vm_page_prot))`
205			`return -EAGAIN;`
206			`return 0;`
207			`#else /* !NO_MM */`
208			`/* FIXME: trivial calloc() implementation is feasible */`
209			`return -ENOSYS;`
210			`#endif /* !NO_MM */`
211			`}`
212
213			`static int write_full(struct inode * inode, struct file * file, const char * buf, int count)`
214			`{`
215			`return -ENOSPC;`
216			`}`
217
218			`/*`
219			`* Special lseek() function for /dev/null and /dev/zero. Most notably, you can fopen()`
220			`* both devices with "a" now. This was previously impossible. SRB.`
221			`*/`
222
223			`static int null_lseek(struct inode * inode, struct file * file, off_t offset, int orig)`
224			`{`
225			`return file->f_pos=0;`
226			`}`
227			`/*`
228			`* The memory devices use the full 32/64 bits of the offset, and so we cannot`
229			`* check against negative addresses: they are ok. The return value is weird,`
230			`* though, in that case (0).`
231			`*`
232			`* also note that seeking relative to the "end of file" isn't supported:`
233			`* it has no meaning, so it returns -EINVAL.`
234			`*/`
235			`static int memory_lseek(struct inode * inode, struct file * file, off_t offset, int orig)`
236			`{`
237			`switch (orig) {`
238			`case 0:`
239			`file->f_pos = offset;`
240			`return file->f_pos;`
241			`case 1:`
242			`file->f_pos += offset;`
243			`return file->f_pos;`
244			`default:`
245			`return -EINVAL;`
246			`}`
247			`if (file->f_pos < 0)`
248			`return 0;`
249			`return file->f_pos;`
250			`}`
251
252			`#define write_kmem write_mem`
253			`#define mmap_kmem mmap_mem`
254			`#define zero_lseek null_lseek`
255			`#define full_lseek null_lseek`
256			`#define write_zero write_null`
257			`#define read_full read_null`
258
259			`static struct file_operations ram_fops = {`
260			`memory_lseek,`
261			`read_ram,`
262			`write_ram,`
263			`NULL, /* ram_readdir */`
264			`NULL, /* ram_select */`
265			`NULL, /* ram_ioctl */`
266			`NULL, /* ram_mmap */`
267			`NULL, /* no special open code */`
268			`NULL, /* no special release code */`
269			`NULL /* fsync */`
270			`};`
271
272			`static struct file_operations mem_fops = {`
273			`memory_lseek,`
274			`read_mem,`
275			`write_mem,`
276			`NULL, /* mem_readdir */`
277			`NULL, /* mem_select */`
278			`NULL, /* mem_ioctl */`
279			`mmap_mem,`
280			`NULL, /* no special open code */`
281			`NULL, /* no special release code */`
282			`NULL /* fsync */`
283			`};`
284
285			`static struct file_operations kmem_fops = {`
286			`memory_lseek,`
287			`read_kmem,`
288			`write_kmem,`
289			`NULL, /* kmem_readdir */`
290			`NULL, /* kmem_select */`
291			`NULL, /* kmem_ioctl */`
292			`mmap_kmem,`
293			`NULL, /* no special open code */`
294			`NULL, /* no special release code */`
295			`NULL /* fsync */`
296			`};`
297
298			`static struct file_operations null_fops = {`
299			`null_lseek,`
300			`read_null,`
301			`write_null,`
302			`NULL, /* null_readdir */`
303			`NULL, /* null_select */`
304			`NULL, /* null_ioctl */`
305			`NULL, /* null_mmap */`
306			`NULL, /* no special open code */`
307			`NULL, /* no special release code */`
308			`NULL /* fsync */`
309			`};`
310
311			`static struct file_operations port_fops = {`
312			`memory_lseek,`
313			`read_port,`
314			`write_port,`
315			`NULL, /* port_readdir */`
316			`NULL, /* port_select */`
317			`NULL, /* port_ioctl */`
318			`NULL, /* port_mmap */`
319			`NULL, /* no special open code */`
320			`NULL, /* no special release code */`
321			`NULL /* fsync */`
322			`};`
323
324			`static struct file_operations zero_fops = {`
325			`zero_lseek,`
326			`read_zero,`
327			`write_zero,`
328			`NULL, /* zero_readdir */`
329			`NULL, /* zero_select */`
330			`NULL, /* zero_ioctl */`
331			`mmap_zero,`
332			`NULL, /* no special open code */`
333			`NULL /* no special release code */`
334			`};`
335
336			`static struct file_operations full_fops = {`
337			`full_lseek,`
338			`read_full,`
339			`write_full,`
340			`NULL, /* full_readdir */`
341			`NULL, /* full_select */`
342			`NULL, /* full_ioctl */`
343			`NULL, /* full_mmap */`
344			`NULL, /* no special open code */`
345			`NULL /* no special release code */`
346			`};`
347
348			`static int memory_open(struct inode * inode, struct file * filp)`
349			`{`
350			`switch (MINOR(inode->i_rdev)) {`
351			`case 0:`
352			`case 1:`
353			`case 2:`
354			`case 4:`
355			`if(securelevel>0)`
356			`return -EPERM;`
357			`}`
358			`switch (MINOR(inode->i_rdev)) {`
359			`case 0:`
360			`filp->f_op = &ram_fops;`
361			`break;`
362			`case 1:`
363			`filp->f_op = &mem_fops;`
364			`break;`
365			`case 2:`
366			`filp->f_op = &kmem_fops;`
367			`break;`
368			`case 3:`
369			`filp->f_op = &null_fops;`
370			`break;`
371			`case 4:`
372			`filp->f_op = &port_fops;`
373			`break;`
374			`case 5:`
375			`filp->f_op = &zero_fops;`
376			`break;`
377			`case 7:`
378			`filp->f_op = &full_fops;`
379			`break;`
380			`case 8:`
381			`filp->f_op = &random_fops;`
382			`break;`
383			`case 9:`
384			`filp->f_op = &urandom_fops;`
385			`break;`
386			`default:`
387			`return -ENXIO;`
388			`}`
389			`if (filp->f_op && filp->f_op->open)`
390			`return filp->f_op->open(inode,filp);`
391			`return 0;`
392			`}`
393
394			`static struct file_operations memory_fops = {`
395			`NULL, /* lseek */`
396			`NULL, /* read */`
397			`NULL, /* write */`
398			`NULL, /* readdir */`
399			`NULL, /* select */`
400			`NULL, /* ioctl */`
401			`NULL, /* mmap */`
402			`memory_open, /* just a selector for the real open */`
403			`NULL, /* release */`
404			`NULL /* fsync */`
405			`};`
406
407			`int chr_dev_init(void)`
408			`{`
409			`if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))`
410			`printk("unable to get major %d for memory devs\n", MEM_MAJOR);`
411			`rand_initialize();`
412			`tty_init();`
413			`#ifdef CONFIG_PRINTER`
414			`lp_init();`
415			`#endif`
416			`#if defined (CONFIG_BUSMOUSE) \|\| defined(CONFIG_UMISC) \|\| \`
417			`defined (CONFIG_PSMOUSE) \|\| defined (CONFIG_MS_BUSMOUSE) \|\| \`
418			`defined (CONFIG_ATIXL_BUSMOUSE) \|\| defined(CONFIG_SOFT_WATCHDOG) \|\| \`
419			`defined (CONFIG_PCWATCHDOG) \|\| defined (CONFIG_H8) \|\| defined(CONFIG_WDT) \|\| \`
420			`defined (CONFIG_APM) \|\| defined (CONFIG_RTC) \|\| defined (CONFIG_SUN_MOUSE)`
421			`misc_init();`
422			`#endif`
423			`#ifdef CONFIG_SOUND`
424			`soundcard_init();`
425			`#endif`
426			`#if CONFIG_QIC02_TAPE`
427			`qic02_tape_init();`
428			`#endif`
429			`#if CONFIG_ISDN`
430			`isdn_init();`
431			`#endif`
432			`#ifdef CONFIG_FTAPE`
433			`ftape_init();`
434			`#endif`
435			`#ifdef CONFIG_MCF_MBUS`
436			`mbus_init();`
437			`#endif`
438			`#ifdef CONFIG_WATCHDOG`
439			`watchdog_init();`
440			`#endif`
441			`#ifdef CONFIG_LCDTXT`
442			`lcdtxt_init();`
443			`#endif`
444			`return 0;`
445			`}`