Linux device drivers

... independent of the devices attached to the SCSI cable Other classes of device drivers have been added to the kernel in recent times, including USB drivers, FireWire drivers, and I2O drivers In the ... thus, Chapter 11 , "kmod and Advanced Modularization" starts over with modularization issues, going deeper into the topic Chapter 12 , "Loading Block Drivers" then describes how b...

Ngày tải lên: 24/12/2013, 01:17

... 00100000-0 022 c557 : Kernel code 0 022 c558-0 024 455f : Kernel data 20 000000-2fffffff : Intel Corporation 440BX/ZX 824 43BX/ZX Host bridge 68000000-68000fff : Texas Instruments PCI 122 5 68001000-68001fff : ... : dma2 00f0-00ff : fpu 0170-0177 : ide1 01f0-01f7 : ide0 02f8-02ff : serial(set) 0300-031f : NE2000 0376-0376 : ide1 03c0-03df :...

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 $major mknod /dev/$ {device} 1 c $major mknod /dev/$ {device} 2 c $major mknod /dev/$ {device} 3 ... for char drivers are identified by a "c" in the first column of the output of ls -l Block devices appear in /dev as well, but they are identified by a "b." The focus of this chapter i...

Ngày tải lên: 24/12/2013, 01:17

... eip: c48370c3 *pde = 00000000 Oops: 0002 CPU: EIP: 001 0:[ ] EFLAGS: 00010286 eax: ffffffea ebx: c2281a20 ecx: c48370c0 edi: 40 00c000 ebp: c38adf8c edx: c2281a40 esi: 40 00c000 esp: c38adf8c ... eax: ffffffea ebx: c2c55ae0 ecx: c48370c0 edi: 0804d038 ebp: c2337f8c edx: c2c55b00 esi: 0804d038 esp: c2337f8c ds: 0018 es: 0018 ss: 0018 Process cat (pid: 2 341 3, stackpage=c2337000) Stack: 00...

Ngày tải lên: 24/12/2013, 01:17

... first versions of Linux used 16-bit numbers: the top eight were the "magic'' number associated with the device, and the bottom eight were a sequential number, unique within the device This happened ... argument value * G means "Get ": reply by setting through a pointer * Q means "Query ": response is on the return value * X means "eXchange ": G and S atomically * H means "sHift...

Ngày tải lên: 24/12/2013, 01:17

... xtime is updated less frequently: morgana% cd /proc; cat currentime currentime currentimegettime: 8 461 57215.937221 xtime: 8 461 57215.931188 jiffies: 1308094 gettime: 8 461 57215.939950 xtime: 8 461 57215.931188 ... jiffies: 1308094 gettime: 8 461 57215.942 465 xtime: 8 461 57215.941188 jiffies: 1308095 Delaying Execution Device drivers often need to delay the execution of a particular...

Ngày tải lên: 24/12/2013, 01:17

... systems: salma% cat /tmp/bigfile > /dev/scullp0; head -5 /proc/scullpmem Device 0: qset 500, order 0, sz 1048 576 item at e00000003e641b40, qset at e000000025c60000 0:e00000003007c000 1:e00000002 477 8000 ... /proc/scullpmem Device 0: qset 500, order 0, sz 1048 576 item at c418 478 0, qset at c71c4800 0:c262b000 1:c2193000 rudo% cat /tmp/bigfile > /dev/scullv0; head -5 /proc/scullvm...

Ngày tải lên: 24/12/2013, 01:17

... the device or assigned by system firmware at boot time The former is true, for example, of ISA devices, whose addresses are either burned in device logic circuits, statically assigned in local device ... Memory Despite the popularity of I/O ports in the x86 world, the main mechanism used to communicate with devices is through memory-mapped registers and device memory Both are called I...

Ngày tải lên: 24/12/2013, 01:17

... IO-APIC-level aic7xxx 12: 8 890 91 884276 IO-APIC-edge 13: XT-PIC 15: 17 596 69 1734520 IO-APIC-edge NMI: 695 20 392 695 20 392 LOC: 695 13717 695 13716 ERR: timer keyboard cascade PS/2 Mouse fpu ide1 The first ... 34584323 3 493 6135 IO-APIC-edge 1: 224407 226473 IO-APIC-edge 2: 0 XT-PIC 5: 5636751 5636666 IO-APIC-level eth0 9: 0 IO-APIC-level acpi 10: 56 591 0 5652 69 IO-APIC-level aic7x...

Ngày tải lên: 24/12/2013, 01:17

... The kernel offers the following data types to use whenever you need to know the size of your data All the types are declared in , which in turn is included by : u8; ... independent of its actual size, so the unsigned long type should always be used when working with jiffies In this section we concentrate on use of "_t'' types The complete list of _t types appears in ,...

Ngày tải lên: 24/12/2013, 01:17

... 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 Advanced Linux Sound Architecture ... modprobe -r run pre-install module command post-install module command pre-remove module command post-remove module command The first two specify a command to be run either before...

Ngày tải lên: 21/01/2014, 07:20

... sbull is as follows: struct block _device_ operations sbull_bdops = { open: sbull_open, release: sbull_release, ioctl: sbull_ioctl, check_media_change: sbull_check_change, revalidate: sbull_revalidate, ... references to the device that the kernel keeps in various caches fsync_dev is the implementation of block_ fsync, which is the fsync "method'' for block devices The Header File blk.h...

Ngày tải lên: 21/01/2014, 07:20

... following list summarizes the implementation of the three levels in Linux, and Figure 13- 2 depicts them Figure 13- 2 The three levels of Linux page tables Page Directory (PGD) The top-level page table ... 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 hold...

Ngày tải lên: 21/01/2014, 07:20

... ltalk_setup(struct net _device *dev); Sets up the fields for a LocalTalk device void fc_setup(struct net _device *dev); Initializes for fiber channel devices void fddi_setup(struct net _device *dev); Configures ... i)) ) printk("snull: error %i registering device \"%s\"\n", result, snull_devs[i].name); else device_ present++; Initializing Each Device Probing for the device should...

Ngày tải lên: 21/01/2014, 07:20

... snapshot of the configuration registers of each device, one file per device Configuration Registers and Initialization As mentioned earlier, the layout of the configuration space is device independent ... identify the peripherals PCI devices feature a 256-byte address space The first 64 bytes are standardized, while the rest are device dependent Figure 15- 2 shows the layout of...

Ngày tải lên: 21/01/2014, 07:20