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#include &lt;linux/sched.h&gt;<br>
#include &lt;linux/tty.h&gt;<br>
#include &lt;linux/signal.h&gt;<br>
#include &lt;linux/errno.h&gt;<br>
#include &lt;linux/malloc.h&gt;<br>
#include &lt;linux/mm.h&gt;<br>
#include &lt;asm/io.h&gt;<br>
#include &lt;asm/segment.h&gt;<br>
#include &lt;asm/system.h&gt;<br>
#include &lt;asm/irq.h&gt;<br>
#include "drgn.h"<br>
static int drgn_trace;<br>
static int write_busy;<br>
static int read_busy;<br>
static struct drgn_buf * qhead;<br>
static struct drgn_buf * qtail;<br>
static int drgn_read(struct inode * , struct file * , char * , int );<br>
static int drgn_write(struct inode * , struct file * , const char *, int );<br>
static int drgn_ioctl(struct inode * , struct file * , unsigned int , unsig<br>
ned long );<br>
static int drgn_open(struct inode *,struct file *);<br>
static void drgn_release(struct inode *,struct file *);<br>
/* extern void console_print(char *);*/<br>
struct file_operations drgn_fops=<br>
{<br>
NULL,<br>
drgn_read,<br>
drgn_write,<br>
NULL,<br>
NULL,<br>
drgn_ioctl,<br>
NULL,<br>
drgn_open,<br>
drgn_release,<br>
NULL,<br>
NULL,<br>
NULL,<br>
NULL<br>
};<br>
void drgn_init(void)<br>
{<br>
drgn_trace=TRUE;<br>
if(register_chrdev(30,"drgn",&drgn_fops))<br>
TRACE_TXT("Cannot register drgn driver as major device 30.")<br>
else<br>
TRACE_TXT("Tiny devie driver registered successfully.")<br>
qhead=0;<br>
write_busy=FALSE;<br>
read_busy=FALSE;<br>
/* drgn_trace=FALSE;*/<br>
return;<br>
}<br>
static int drgn_open(struct inode * inode,struct file * file)<br>
{<br>
TRACE_TXT("drgn_open")<br>
switch (MINOR(inode-&gt;i_rdev))<br>
{<br>
case DRGN_WRITE:<br>
if(write_busy)<br>
return -EBUSY;<br>
else{<br>
write_busy=TRUE;<br>
return 0;<br>
}<br>
case DRGN_READ:<br>
if(read_busy)<br>
return -EBUSY;<br>
else{<br>
read_busy=TRUE;<br>
return 0;<br>
}<br>
default:<br>
return -ENXIO;<br>
}<br>
}<br>
static void drgn_release(struct inode * inode,struct file * file)<br>
{<br>
TRACE_TXT("drgn_release")<br>
switch (MINOR(inode-&gt;i_rdev))<br>
{<br>
case DRGN_WRITE:<br>
write_busy=FALSE;<br>
return;<br>
case DRGN_READ:<br>
read_busy=FALSE;<br>
return;<br>
}<br>
}<br>
static int drgn_write(struct inode * inode,struct file * file,<br>
const char * buffer,int count)<br>
{<br>
int i,len;<br>
struct drgn_buf * ptr;<br>
TRACE_TXT("drgn_write")<br>
if (MINOR(inode-&gt;i_rdev)!=DRGN_WRITE)<br>
return -EINVAL;<br>
if ((ptr=kmalloc(sizeof(struct drgn_buf),GFP_KERNEL))==0)<br>
return -ENOMEM;<br>
len=count &lt; MAX_BUF?count:MAX_BUF;<br>
if (verify_area(VERIFY_READ,buffer,len))<br>
return -EFAULT;<br>
for(i=0;i &lt; count && i&lt;MAX_BUF;++i)<br>
{<br>
ptr-&gt;buffer[i]=(char) get_user((char*)(buffer+i));<br>
TRACE_CHR("w")<br>
}<br>
ptr-&gt;link=0;<br>
if(qhead==0)<br>
qhead=ptr;<br>
else<br>
qtail-&gt;link=ptr;<br>
qtail=ptr;<br>
TRACE_CHR("")<br>
ptr-&gt;buf_size=i;<br>
return i;<br>
}<br>
static int drgn_read(struct inode * inode , struct file * file,<br>
char * buffer, int count)<br>
{<br>
int i,len;<br>
struct drgn_buf * ptr;<br>
TRACE_TXT("drgn_read")<br>
if(MINOR(inode-&gt;i_rdev)!=DRGN_READ)<br>
return -EINVAL;<br>
if (qhead==0)<br>
return -ENODATA;<br>
ptr=qhead;<br>
qhead=qhead-&gt;link;<br>
len=count &lt; ptr-&gt;buf_size?count:ptr-&gt;buf_size;<br>
if (verify_area(VERIFY_WRITE,buffer,len))<br>
return -EFAULT;<br>
for (i=0; i&lt;count && i&lt;ptr-&gt;buf_size; ++i)<br>
{<br>
put_user((char) ptr-&gt;buffer[i],(char *)(buffer+i));<br>
TRACE_CHR("r")<br>
}<br>
TRACE_CHR("")<br>
kfree_s(ptr,sizeof(struct drgn_buf));<br>
return i;<br>
}<br>
static int drgn_ioctl(struct inode * inode, struct file * file,<br>
unsigned int cmd, unsigned long arg)<br>
{<br>
TRACE_TXT("drgn_ioctl")<br>
/* if (cmd==DRGN_TRON){<br>
drgn_trace=TRUE;<br>
return 0;<br>
}<br>
else<br>
if (cmd==DRGN_TROFF){<br>
drgn_trace=FALSE;<br>
return 0;<br>
}<br>
else<br>
return -EINVAL;*/<br>
switch(cmd)<br>
{<br>
case DRGN_TRON:<br>
drgn_trace=TRUE;<br>
return 0;<br>
case DRGN_TROFF:<br>
drgn_trace=FALSE;<br>
return 0;<br>
default:<br>
return -EINVAL;<br>
}<br>
}
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