LinuxÄÚºË̬ϵÄÎļþ²Ù×÷
ÔÚVFSµÄÖ§³ÖÏ£¬Óû§Ì¬½ø³Ì¶ÁдÈκÎÀàÐ͵ÄÎļþϵͳ¶¼¿ÉÒÔʹÓÃreadºÍwrite×ÅÁ½¸öϵͳµ÷Ó㬵«ÊÇÔÚlinuxÄÚºËÖÐûÓÐÕâÑùµÄϵͳµ÷ÓÃÎÒÃÇÈçºÎ²Ù×÷ÎļþÄØ£¿ÎÒÃÇÖªµÀreadºÍwriteÔÚ½øÈëÄÚºË̬֮ºó£¬Êµ¼ÊÖ´ÐеÄÊÇsys_readºÍsys_write£¬µ«ÊDz鿴ÄÚºËÔ´´úÂ룬·¢ÏÖÕâЩ²Ù×÷ÎļþµÄº¯Êý¶¼Ã»Óе¼³ö(ʹÓÃEXPORT_SYMBOLµ¼³ö)£¬Ò²¾ÍÊÇ˵ÔÚÄÚºËÄ£¿éÖÐÊDz»ÄÜʹÓõģ¬ÄÇÈçºÎÊǺã¿
ͨ¹ý²é¿´sys_openµÄÔ´ÂëÎÒÃÇ·¢ÏÖ£¬ÆäÖ÷ҪʹÓÃÁËdo_filp_open()º¯Êý£¬¸Ãº¯ÊýÔÚfs/namei.cÖУ¬¶øÔÚ¸ÄÎļþÖУ¬filp_openº¯ÊýÒ²Êǵ÷ÓÃÁËdo_filp_openº¯Êý£¬²¢ÇÒ½Ó¿ÚºÍsys_openº¯Êý¼«ÎªÏàËÆ£¬µ÷ÓòÎÊýÒ²ºÍsys_openÒ»Ñù£¬²¢ÇÒʹÓÃEXPORT_SYMBOLµ¼³öÁË£¬ËùÒÔÎÒÃDzÂÏë¸Ãº¯Êý¿ÉÒÔ´ò¿ªÎļþ£¬¹¦ÄܺÍopenÒ»Ñù¡£Ê¹ÓÃͬÑùµÄ²éÕÒ·½·¨£¬ÎÒÃÇÕÒ³öÁËÒ»×éÔÚÄÚºËÖвÙ×÷ÎļþµÄº¯Êý£¬ÈçÏ£º
¹¦ÄÜ
º¯ÊýÔÐÍ
´ò¿ªÎļþ
struct file *filp_open(const char *filename, int flags, int mode)
¶ÁÈ¡Îļþ
ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
дÎļþ
ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
¹Ø±ÕÎļþ
int filp_close(struct file *filp, fl_owner_t id)
ÎÒÃÇ×¢Òâµ½ÔÚvfs_readºÍvfs_writeº¯ÊýÖУ¬Æä²ÎÊýbufÖ¸ÏòµÄÓû§¿Õ¼äµÄÄÚ´æµØÖ·£¬Èç¹ûÎÒÃÇÖ±½ÓʹÓÃÄں˿ռäµÄÖ¸Õ룬Ôò»á·µ»Ø-EFALUT¡£ËùÒÔÎÒÃÇÐèҪʹÓÃ
set_fs()ºÍget_fs()ºêÀ´¸Ä±äÄں˶ÔÄÚ´æµØÖ·¼ì²éµÄ´¦Àí·½Ê½£¬ËùÒÔÔÚÄں˿ռä¶ÔÎļþµÄ¶ÁдÁ÷³ÌΪ£º
mm_segment_t fs = get_fs();
set_fs(KERNEL_FS);
//vfs_write();
vfs_read();
set_fs(fs);
ÏÂÃæÎªÒ»¸öÔÚÄÚºËÖжÔÎļþ²Ù×÷µÄÀý×Ó£º
#include
#include
#include
#include
static char buf[] = "ÄãºÃ";
static char buf1[10];
int __init hello_init(void)
{
struct file *fp;
mm_segment_t fs;
loff_t pos;
printk("hello enter\n");
fp = filp_open("/home/niutao/kernel_file", O_RDWR | O_CREAT, 0644);
if (IS_ERR(fp)) {
printk("create file error\n");
&
Ïà¹ØÎĵµ£º
´´½¨×ÀÃæÍ¼±ê
Ŀǰ½«ÍøÂçÓ¦ÓÃÀ©Õ¹µ½×ÀÃæÊÇÒ»¸öÇ÷ÊÆ£¬´æÔÚןܶà½â¾ö·½°¸£¬±¾ÎÄÒÔ Mozilla Prism ΪÀý£¬ÀàËÆµÄ·½·¨Í¬ÑùÊÊÓÃÓÚ Google Chrome ¡£
1. µ½ Mozilla Prism µÄÍøÕ¾ÉÏÏÂÔØ Prism£¬µã»÷ Download Now Ö®ºó»áÌáʾÓÐÁ½ÖÖ£¬Ò»ÖÖÊÇÒÔ Mozilla Firefox À©Õ¹µÄ·½Ê½£¬ÊʺÏÒѾ°²×°ÓÐ Firefox µÄÅóÓÑ£»Ò»Ö ......
Ò»¡¢UbootÉÕ¼
1¡¢Á¬½Ójtag¡¢ÍøÏß¡¢´®¿Ú
2¡¢°Ñtftpd32.exe·Åµ½ubootÉÕ¼µÄĿ¼Àï
3¡¢Æô¶¯tftpd32.exe
4¡¢Æô¶¯ttermpro.exe
5¡¢Ë«»÷uboot.bat
6¡¢µÈµ½´°¿Úµ¯³öÀ´
8¡¢ÔÚ´®¿Ú¹¤¾ßÖÐ
1¡¢ Ö´ÐÐprint ÃüÁ²é¿´»·¾³±äÁ¿
2¡¢Ö´ÐÐsetenv serverip ¾ßÌåIP µØÖ·£¬ÅäÖÃtftp server µÄµØÖ·µÈ
3¡¢Ö´ÐÐsetenv loadaddr 8200000 ......
Ò»¡¢ÏÂÔØjpeg¿â
¶þ¡¢ÅäÖñàÒ룬Éú³ÉMakefileÎļþ¡£
#./configure --prefix=/usr/arm/arm-linux --exec-prefix=/usr/arm/arm-linux \
--enable-shared --enable-static
×¢Ò⣺prefixÊÇ×îºó°²×°Ê±¿â´æ·ÅµÄÎļþ£¬sharedÊDZàÒë³É¶¯Ì¬¿â£¬staticÊDZàÒë³É¾²Ì¬¿â
Èý¡¢ÐÞ¸ÄÉú³ÉµÄMakefile¡£
ʹÓÃgedit £Í£á£ë£å£æ£é£ì£å
½«CC ......
Ò»ÄêÒ»¶ÈµÄLinux¿ª·¢Õß´ó»áÉÏÖÜÔھɽðɽ¾ÙÐУ¬»áÉÏLinux»ù½ð»áÖ´ÐÐÀíÊÂJim Zemlin±íʾ£¬µÃÒæÓÚÔÆ¼ÆËãÒÔ¼°ÆäËü¿Æ¼¼³±Á÷µÄ³öÏÖ£¬LinuxµÄÊг¡µØÎ»Ê®·ÖÎȹ̣¬È»¶øÒ»Ð©Ö÷ÒªµÄά»¤ÈËÔ±ÒѾÈÕ½¥²ÔÀÏ£¬ºó¼ÌÕßÈ´»¹Ã»ÓгÉÊì¡£
sysfsÄÚºË×Óϵͳά»¤ÕßGrey Kroah-HartmanÖ¸³ö£º“ÉϲãµÄÈËÔ±ÈÔȻà ......