Linux device drivers

Tài liệu Linux Device Drivers-Chapter 1 :An Introduction to Device Drivers ppt

Tài liệu Linux Device Drivers-Chapter 1 :An Introduction to Device Drivers ppt
... 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 block drivers are ... Figure 1- 1, into the following parts: Figure 1- 1 A split view of the kernel Process management The kernel is in charge of creating and destroying processes and handling their connection to the...
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Tài liệu Linux Device Drivers-Chapter 2 : Building and Running Modules pptx

Tài liệu Linux Device Drivers-Chapter 2 : Building and Running Modules pptx
... 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 : vga+ 03f6-03f6 : ide0 03f8-03ff : serial(set) 1000-103f : Intel ... is running version 2. 4 of the kernel will look like the following: 0000-001f : dma1 0 020 -003f : pic1 0040-005f : timer 0060-006f : keyboard 0080-008f : dma page reg 00a0-00bf : pic2 00c0-00df :...
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Tài liệu Linux Device Drivers-Chapter 3: Char Drivers docx

Tài liệu Linux Device Drivers-Chapter 3: Char Drivers docx
... /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 is on char devices, ... 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 abstractions...
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Tài liệu Linux Device Drivers-Chapter 4 : Debugging Techniques pptx

Tài liệu Linux Device Drivers-Chapter 4 : Debugging Techniques pptx
... 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: 00000001 ... ls(16 740 ): Oops TSTATE: 00000 044 00009601 TPC: 0000000001000128 TNPC: 000000000 045 7fbc \ Y: 00800000 g 0: 000000007002ea88 g 1: 00000000000000 04 g 2: 0000000070029fb0 \ g 3: 0000000000000018 g 4: fffff80000000000...
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Tài liệu Linux Device Drivers-Chapter 5 : Enhanced Char Driver Operations pptx

Tài liệu Linux Device Drivers-Chapter 5 : Enhanced Char Driver Operations pptx
... 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 ": T and Q atomically */ ... mainly for historical reasons: when Unix developers faced the problem of controlling I/O operations, they decided that files and devices were different At the time, the only devices with ioctl implementations...
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Tài liệu Linux Device Drivers-Chapter 6 : Flow of Time pptx

Tài liệu Linux Device Drivers-Chapter 6 : Flow of Time pptx
... 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 piece of code for a period of ... 60 168 7 0 keventd 60 168 7 0 keventd 60 168 7 0 keventd 60 168 7 0 keventd 60 168 7 0 keventd 60 168 7 0 keventd 60 168 7 0 keventd In this output, the time field is the value of jiffies when the task is run,...
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Tài liệu Linux Device Drivers-Chapter 7 : Getting Hold of Memory doc

Tài liệu Linux Device Drivers-Chapter 7 : Getting Hold of Memory doc
... 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/scullvmem Device 0: qset 500, ... memory, as outlined next Lookaside Caches A device driver often ends up allocating many objects of the same size, over and over Given that the kernel already maintains a set of memory pools of...
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Tài liệu Linux Device Drivers-Chapter 8 :Hardware Management docx

Tài liệu Linux Device Drivers-Chapter 8 :Hardware Management docx
... 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/O memory because ... ECP and EPP modes) is made up of three 8- bit ports The PC standard starts the I/O ports for the first parallel interface at 0x3 78, and for the second at 0x2 78 The first port is a bidirectional data...
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Tài liệu Linux Device Drivers-Chapter 9 :Interrupt Handling Although doc

Tài liệu Linux Device Drivers-Chapter 9 :Interrupt Handling Although doc
... 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 aic7xxx 12: 8 890 91 884276 ... linebroken) snapshot was taken shortly after the previous one: intr 884865 695 557 4527 31 09 490 7 1127 59 0 11314 17747 3 494 1 0 0 0 The first number is the total of all interrupts, while each of the...
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Tài liệu Linux Device Drivers-Chapter 10 :Judicious Use of Data Types doc

Tài liệu Linux Device Drivers-Chapter 10 :Judicious Use of Data Types doc
... 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 , ... porting software to other Unix flavors Systems with recent compilers will support the C99-standard types, such as uint8_t and uint32_t; when possible, those types should be used in favor of the Linux- specific...
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Tài liệu Linux Device Drivers-Chapter 11 : kmod and Advanced docx

Tài liệu Linux Device Drivers-Chapter 11 : kmod and Advanced docx
... 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 or after the ... hot-plug subsystem (i.e., for USB devices and such) to perform module loading and configuration tasks when a new device is attached to the system Its prototype is: int call_usermodehelper(char *path,...
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Tài liệu Linux Device Drivers-Chapter 12 : Loading Block Drivers docx

Tài liệu Linux Device Drivers-Chapter 12 : Loading Block Drivers docx
... 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 All block drivers should ... in the early days of Linux, when all block devices had preassigned major numbers and modular block drivers were not supported If you look at blk.h, you'll see that several device- dependent symbols...
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Tài liệu Linux Device Drivers-Chapter 13 :mmap and DMA pptx

Tài liệu Linux Device Drivers-Chapter 13 :mmap and DMA pptx
... 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 holding the device special ... doesn't release device memory as long as the device is mapped This is a matter of policy rather than a requirement, and it is different from the behavior of scull and similar devices, which are...
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Tài liệu Linux Device Drivers-Chapter 14 :Network Drivers ppt

Tài liệu Linux Device Drivers-Chapter 14 :Network Drivers ppt
... 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 be performed in the init function ... into the Linux kernel, it doesn't declare its own net _device structures; the structures declared in drivers/ net/Space.c are used instead Space.c declares a linked list of all the network devices,...
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Tài liệu Linux Device Drivers-Chapter 15 :Overview of Peripheral Buses pdf

Tài liệu Linux Device Drivers-Chapter 15 :Overview of Peripheral Buses pdf
... 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 the device- independent ... bits first It is possible for one device to offer both 32-bit regions and 64-bit regions PCI I/O resources in Linux 2.4 In Linux 2.4, the I/O regions of PCI devices have been integrated in the...
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