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Ê×ÏÈÕì²â¿ÉÓõĶ˿Ú(µØÖ·)·¶Î§£¬Í¨¹ýÏÂÃæµÄº¯Êý:

int check_region (unsigned long start£¬ unsigned long len);

º¯Êý·µ»Ø0±íʾ¶Ë¿ÚµØÖ·¿ÉÓ㬷µ»ØÐ¡ÓÚÁã»ò¸ºµÄ´íÎó±àÂë( -EBUSY or -EINVAL) ±íʾÒÑÔÚʹÓÃÖС£º¯Êý½ÓÊÜ2¸ö²ÎÊý: start ÊÇ Á¬ÐøÇøÓò£¨»òI/O¶Ë¿Ú·¶Î§£©µÄÆðʼֵ£¬¶ølenÊÇÇøÓòÄڵĶ˿ÚÊýÄ¿¡£

µ±¶Ë¿Ú¿ÉÓÃʱ£¬Ó¦¸Ã½«Ëü·ÖÅ䏸É豸£¬Í¨¹ýrequest_region º¯Êý¡£

struct resource *request_region (unsigned long start£¬ unsigned long len£¬ char *name);

Í·Á½¸ö²ÎÊýºÍÎÒÃÇÇ°Ãæ¿´µ½µÄÒ»Ñù£¬×Ö·ûÖ¸Õë±äÁ¿nameÊÇÒª·ÖÅä¶Ë¿ÚµØÖ·µÄÉ豸Ãû³Æ¡£º¯Êý·µ»ØÖ¸Ïòresource½á¹¹µÄÖ¸Õë¡£Resource½á¹¹ÓÃÀ´ÃèÊö×ÊÔ´µÄ·¶Î§£¬¶¨ÒåÓÚ¡£½á¹¹µÄ¸ñʽ¶¨ÒåÈçÏÂ:

struct resource {
        const char *name;
        unsigned long start£¬ end;
        unsigned long flags;
        struct resource *parent£¬ *sibiling£¬ *child;
      };

µ±Ä£¿é´ÓÄÚºËÒÆ³öʱ£¬¶Ë¿ÚÓ¦µ±±»ÊÍ·ÅÒÔ±ãΪÆäËüÉ豸ʹÓã¬Îª´ËÎÒÃÇÔÚ cleanup_module ( )ÖРʹÓÃrelease_region ( ) º¯Êý¡£ º¯ÊýµÄÓï·¨ÈçÏÂ:

void release_region ( unsigned long start£¬ unsigned long len);

Á½¸ö²ÎÊýµÄ½âÊͺÍÇ°ÃæÒ»Ö¡£ ÒÔÉϵÄ3¸öº¯Êýʵ¼ÊÉÏÊǺ궨Ò壬¶¨ÒåÓÚ¡£

É豸¶Ë¿Ú·ÖÅäµÄÇý¶¯´úÂëÀý×Ó

ÏÂÃæµÄ³ÌÐò˵Ã÷Á˶¯Ì¬¼ÓÔØÉ豸µÄ¶Ë¿Ú·ÖÅäÓë»ØÊÕ:

#include <linux/fs¡£h¡£>
#include <linux/ioport¡£h¡£>
struct file_operations fops;
unsigned long start£¬ len;
int init_module (void)
{
 int status;
 start = 0xff90;
 len   = 0x90;
 register_chrdev(254£¬"your_device"£¬&fops);
 status = check_region (start£¬ len);
 if (status == 0) {
     printk ("The ports are available in that range¡£\n");
     request_region(start£¬len£¬"your_device");
 } else {
     printk ("The ports are already in use¡£ Try other range¡£\n");
     return (status);
 }
 return 0;
}
void cleanup_module (void)
{
 release_region(start£¬ len);
 printk (" ports are freed successfully\n");
 unregister_chrdev(254£¬"your_device");}
 printk (" your device is unregistered\n");
      }

ΪÁ˱ÜÃâ»ìÏý£¬Àý×Ó´úÂëÖÐÈ¥µôÁË´íÎó¼ì²éºÍºÍÖ÷(É豸)ºÅµÄ¶¯Ì¬·ÖÅä¡£ µ±¶Ë¿Ú·ÖÅä³É¹¦Ê±£¬ÎÒÃÇ¿ÉÒÔÔÚprocĿ¼Öмì²é:

$cat /proc/ioports

Çý¶¯³ÌÐòµÄÄÚºËI/O¶Ë¿Úº¯ÊýÑ¡Ôñ

LinuxÖ§³Ö²»Í¬Î»¿íµÄ¶Ë¿Úº¯Êý£¬ÓÃÓÚI/O¶Ë¿ÚµÄ¶Áд¡£¶Ë¿Ú¿ÉÒÔÊÇ8룬16λ»ò32λ¡£LinuxµÄÄÚ ºËÍ·Îļþ¶¨ÒåÁË·ÃÎÊI/O¶Ë¿ÚµÄÄÚÁª(inline)º¯Êý£¬ÓÃÓÚ¶ÁÈ¡(inx)»òдÈë(outx) 8룬16λÒÔ¼°32λ¶Ë¿Ú¡£ÕâЩº¯ÊýÊÇ:

__u8 inb (unsigned int port);
void outb (__u8 data£¬ unsigned int port);
__u16 inw (unsigned int port);
void outw(__u16 data£¬ unsigned int port);
__u32 inl (unsigned int prot);
      void outl (__u32 data£¬ unsigned int port);

ÕâЩº¯ÊýµÄ´®°æ±¾(string versions)ÄÜÈÃÄãÔÚµ¥Î»Ê±¼äÄÚ¸üÓÐЧµÄ´«ÊäÒ»¸öÒÔÉϵÄÊý¾Ý£¬Í¨¹ýÒÔϺ¯Êý:

void insb(unsigned int port£¬ void *addr£¬ unsigned long count);
      void outsb(unsigned int port£¬ void *addr£¬ unsigned long count);

addr ÊDZ»´«Èë»ò´«³öµÄÄÚ´æµ¥ÔªµØÖ·£¬countÊDZ»´«Êäµ¥ÔªµÄÊýÁ¿¡£ Data ÔòÊDZ»¶ÁÈ¡»ò дÈëµ½"port"¶Ë¿ÚµÄÊý¾Ý:

void insw(unsigned int port£¬ void *addr£¬ unsigned long count);
      void outsw(unsigned int port£¬ void *addr£¬ unsigned long count);

Ïò16λ¶Ë¿Ú¶Áд16λÊý¾Ý:

void insl(unsigned int port£¬ void *addr£¬ unsigned long count);
      void outsl(unsigned int port£¬ void *addr£¬ unsigned long count);

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