Tài liệu Linux Device Drivers-Chapter 12 : Loading Block Drivers docx

... half */ #define DEVICE_ NO_RANDOM /* no entropy to contribute */ #define DEVICE_ REQUEST sbull_request #define DEVICE_ OFF(d) /* do-nothing */ Chapter 12 : Loading Block Drivers Our discussion ... number for the device, DEVICE_ NAME is the name of the device to be used in error messages, DEVICE_ NR returns the minor number of the physical device referred to by...

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 ... whole acquired image using mmap or lseek. Block devices Like char devices, block devices are accessed by filesystem nodes in the /dev directory. A block device is somet...

Ngày tải lên: 24/12/2013, 01:17

... to Device Drivers& quot;. #define MODULE #include < ;linux/ module.h> buffer-based graphics environments, where the X server acts only as a server based on a real kernel-space device ... users.  The most important devices can't be handled in user space, including, but not limited to, network interfaces and block devices. As you see, user-space drivers can't...

Ngày tải lên: 24/12/2013, 01:17

... /dev/$ {device} [0-3] major=`awk "\\$2==\"$module\" {print \\$1}" /proc/devices` mknod /dev/$ {device} 0 c $major 0 mknod /dev/$ {device} 1 c $major 1 mknod /dev/$ {device} 2 ... 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...

Ngày tải lên: 24/12/2013, 01:17

... eip: c48370c3 *pde = 00000000 Oops: 0002 CPU: 0 EIP: 001 0:[ <c48370c3>] EFLAGS: 00010286 eax: ffffffea ebx: c2281a20 ecx: c48370c0 edx: c2281a40 esi: 4000c000 edi: 4000c000 ebp: ... 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: 0...

Ngày tải lên: 24/12/2013, 01:17

... the same device) is best solved by implementing one device node for each access policy. An example of this practice can be found in the Linux tape driver, which provides multiple device files ... same device. Different device files will, for example, cause the drive to record with or without compression, or to automatically rewind the tape when the device is closed. Cloning...

Ngày tải lên: 24/12/2013, 01:17

... introduced the following symbols: #include < ;linux/ param.h> HZ The HZ symbol specifies the number of clock ticks generated per second. #include < ;linux/ sched.h> volatile unsigned ... #include < ;linux/ delay.h> void udelay(unsigned long usecs); Chapter 6 : Flow of Time At this point, we know the basics of how to write a full-featured char module. Real-world...

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 ... and GFP_ATOMIC, although those two cover most of the needs of device drivers. All the flags are defined in < ;linux/ mm.h> ;: individual flags are prefixed with a double under...

Ngày tải lên: 24/12/2013, 01:17

... port); Chapter 8 :Hardware Management Although playing with scull and similar toys is a good introduction to the software interface of a Linux device driver, implementing a real device requires ... don't usually share device drivers with other platforms, because their peripheral buses are different. The prototypes for string functions are the following: void insb(unsign...

Ngày tải lên: 24/12/2013, 01:17

... acpi 1 0: 565910 565269 IO-APIC-level aic7xxx 1 2: 889091 884276 IO-APIC-edge PS/2 Mouse 1 3: 1 0 XT-PIC fpu 1 5: 1759669 1734520 IO-APIC-edge ide1 NMI: 69520392 69520392 LOC: 69513717 ... Pentium system: CPU0 CPU1 0: 34584323 34936135 IO-APIC-edge timer 1: 224407 226473 IO-APIC-edge keyboard 2: 0 0 XT-PIC cascade 5: 5636751 5636666 IO-APIC-level...

Ngày tải lên: 24/12/2013, 01:17