Tài liệu Linux Device Drivers-Chapter 11 : kmod and Advanced docx

... unique number from an arbitrary amount of data. Chapter 11 : kmod and Advanced Modularization In this second part of the book, we discuss more advanced topics than we've seen up to now. Once ... requested this way: char and block drivers, filesystems, line disciplines, network protocols, and so on. One example of a driver that benefits from demand loading is the...

Ngày tải lên: 21/01/2014, 07:20

... sequential or random-access device, one device or many, and so on. To make scull be useful as a template for writing real drivers for real devices, we'll show you how to implement several device ... /dev/$ {device} [0-3] major=`awk "\\$2==\"$module\" {print \\$1}" /proc/devices` mknod /dev/$ {device} 0 c $major 0 mknod /dev/$ {device} 1 c $major 1 m...

Ngày tải lên: 24/12/2013, 01:17

... easy to use. I/O Ports and I/O Memory Every peripheral device is controlled by writing and reading its registers. Most of the time a device has several registers, and they are accessed at ... misc-progs/inp.c and misc-progs/outp.c are a minimal tool for reading and writing ports from the command line, in user space. They expect to be installed under multiple names (i.e., i...

Ngày tải lên: 24/12/2013, 01:17

... detail in Chapter 11, " ;kmod and Advanced Modularization". Please note that this description of the internals applies only to versions 2.2 and 2.4 of the kernel; Linux 2.0 did the ... "Version Control in Modules" in Chapter 11, " ;kmod and Advanced Modularization", includes the following lines to export the symbol portably: #ifdef __USE_OLD_...

Ngày tải lên: 24/12/2013, 01:17

... list in itself and those symbols are rarely useful to device drivers. #include < ;linux/ mm.h> All the functions and structures related to memory management are prototyped and defined in ... The major and minor numbers of the device holding the file that has been mapped. Confusingly, for device mappings, the major and minor numbers refer to the disk partition holdi...

Ngày tải lên: 21/01/2014, 07:20

... Chapter 1 :An Introduction to Device Drivers As the popularity of the Linux system continues to grow, the interest in writing Linux device drivers steadily increases. Most of Linux is independent ... (as explained in Chapter 2, "Building and Running Modules", in the section "Version Dependency", and Chapter 11, " ;kmod and Advanced Modularizatio...

Ngày tải lên: 24/12/2013, 01:17

... 001 0:[ faulty:faulty_write+3/576] EFLAGS: 00010286 eax: ffffffea ebx: c2c55ae0 ecx: c48370c0 edx: c2c55b00 esi: 0804d038 edi: 0804d038 ebp: c2337f8c esp: c2337f8c ds: 0018 es: 0018 ss: 0018 Process cat (pid: 23413, stackpage=c2337000) ... ffffffea ebx: c2281a20 ecx: c48370c0 edx: c2281a40 esi: 4000c000 edi: 4000c000 ebp: c38adf8c esp: c38adf8c ds: 0018 es: 0018 ss: 0018 Process...

Ngày tải lên: 24/12/2013, 01:17

... handle than ioctl. Nonetheless, sometimes it's a useful approach to device control and is used by tty's and other devices. We'll describe it later in this chapter in " ;Device ... device using input/output redirection: the device is shared by all commands run on the same virtual terminal and is kept separate from the one seen by commands run on another term...

Ngày tải lên: 24/12/2013, 01:17

... kernel functions udelay and mdelay serve this purpose.[27] Their prototypes are [27] The u in udelay represents the Greek letter mu and stands for micro. #include < ;linux/ delay.h> void ... most useful when writing interrupt handlers, and we'll see them again in "Tasklets and Bottom-Half Processing", in Chapter 9, "Interrupt Handling". Kernel timer...

Ngày tải lên: 24/12/2013, 01:17

... 0:c262b000 1:c2193000 rudo% cat /tmp/bigfile > /dev/scullv0; head -5 /proc/scullvmem Device 0: qset 500, order 4, sz 1048576 item at c4184b80, qset at c71c4000 0:c881a000 1:c882b000 ... happens, the Linux kernel takes advantage of the feature, and both the kernel and get_free_pages addresses lie in one of those memory ranges. The difference is transparent to dev...

Ngày tải lên: 24/12/2013, 01:17