introduction to linux device drivers ppt
Tài liệu Linux Device Drivers-Chapter 1 :An Introduction to Device Drivers ppt
Ngày tải lên :
24/12/2013, 01:17
... strange to say
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 ... 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 ... modularity makes Linux drivers easy to write, to the point that
there are now hundreds of them available.
There are a number of reasons to be interested in the writing of Linux device
drivers. The...
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Tài liệu Linux Device Drivers-Chapter 2 : Building and Running Modules pptx
Ngày tải lên :
24/12/2013, 01:17
... to cross compile for your target platform, you'll need to replace all of
your tools (gcc, ld, etc.) with another set of tools (for example, m68k -linux-
gcc, m68k -linux- ld). The prefix to ... used to register
and you're not likely to be able to figure out the address. Recovery from
such situations is tricky, and you'll be often forced to reboot in order to be
able to load ... That is, the module will not belong to any of the classes listed in
"Classes of Devices and Modules" in Chapter 1, "An Introduction to Device
Drivers& quot;. The sample driver shown...
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Tài liệu Linux Device Drivers-Chapter 4 : Debugging Techniques pptx
Ngày tải lên :
24/12/2013, 01:17
... values; to be meaningful to the
programmer they need to be resolved to symbols. A couple of utilities are
available to perform this resolution for developers: klogd and ksymoops. The
former tool ...
/proc is heavily used in the Linux system. Many utilities on a modern Linux
distribution, such as ps, top, and uptime, get their information from /proc.
Some device drivers also export information ... virtual terminal. To select a
different virtual terminal to receive messages, you can issue
ioctl(TIOCLINUX) on any console device. The following program,
setconsole, can be used to choose which...
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Tài liệu Linux Device Drivers-Chapter 5 : Enhanced Char Driver Operations pptx
Ngày tải lên :
24/12/2013, 01:17
... out to the device later, at interrupt time
without control needing to go back to user space for a second or third write
call. The choice of a suitable size for the output buffer is clearly device ... more to the point. Because
most recent Linux system are libc6 based, we'll stick to the standard and
return -ENOTTY. It's still pretty common, though, to return -EINVAL in
response to ... integer value,
and some take a pointer to other data. Using a pointer is the way to pass
arbitrary data to the ioctl call; the device will then be able to exchange any
amount of data with user...
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Tài liệu Linux Device Drivers-Chapter 6 : Flow of Time pptx
Ngày tải lên :
24/12/2013, 01:17
... by a device driver to handle asynchronous tasks which, usually, are
too large to be done while handling a hardware interrupt. This chapter
should make sense without an understanding of bottom ... 1308095
Delaying Execution
Device drivers often need to delay the execution of a particular piece of code
for a period of time usually to allow the hardware to accomplish some
task. In this ...
systems). Programmers are strongly urged to use this function to
initialize a timer and to never explicitly touch the pointers in the
structure, in order to be forward compatible.
void add_timer(struct...
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Tài liệu Linux Device Drivers-Chapter 13 :mmap and DMA pptx
Ngày tải lên :
21/01/2014, 07:20
... physical addresses into user space. The typical driver, however, wants
to map only the small address range that applies to its peripheral device, not
all of memory. In order to map to user space only ...
programmer wanted that to happen.
The simplest way to prevent extension of the mapping is to implement a
simple nopage method that always causes a bus signal to be sent to the
faulting process. ... size.
These limits are not a big constraint for drivers, because the program
accessing the device is device dependent anyway. It needs to know how to
make sense of the memory region being mapped,...
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Tài liệu Chapter4 Introduction to the Cisco IOS ppt
Ngày tải lên :
10/12/2013, 16:15
... is 10
(略)
Router#terminal history size ?
<0-256> Size of history buffer
Router#terminal history size 25
Router#sh terminal
(略)
History is enabled,history size is 25
(略)
Gather ...
1.show history:显示最后输入的 10 条命令,默认是 10 条,可以修改该值
2.terminal history size:修改显示最后输入过的的命令的数量,默认是 10 条,最大是 256 条
3.show terminal:显示命令历史缓存大小,如下:
Router#sh terminal
(略)
History is enabled,history size ... connector
Bring Up an Interface
打开和关闭 1 个接口,分别使用 shutdown 和 no shutdown 命令,当你关闭某个接口的时候,使用
sh interfaces 命令可以查看接口状态,并且你将看到以下输出:
Router#sh int e0
Ethernet0 is administratively down,line protocol...
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Tài liệu Module 1: Introduction to SharePoint Portal Server ppt
Ngày tải lên :
10/12/2013, 16:15
... needs.
28 Module 1: Introduction to SharePoint Portal Server
Review
Common Obstacles to Implementing an Effective
Document Management Solution
Introduction to SharePoint Portal Server
Using ...
Portal Server to your own Web site.
iv Module 1: Introduction to SharePoint Portal Server
Module Strategy
Use the following strategy to present this module:
Common Obstacles to Implementing ... PowerPoint.
Module 1: Introduction to SharePoint Portal Server 15
Accessing external content. You can add content sources to a workspace to
provide access to external information,...
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Tài liệu A Concise Introduction to Data Compression- P2 ppt
Ngày tải lên :
14/12/2013, 15:15
... X to its successors in the tree (from left to right and bottom to top). If
the immediate successor has frequency F + 1 or greater, the nodes are still in sorted
order and there is no need to ... 268, and set it
to (116, 265, s). This is why the index needs to be stored.
8. Hash(,115) → 270. Array location 270 is set to (115, 270, ).
9. Hash(a,32) → 268. A collision! Skip to the next available ... on the right and its five leaves on the left. To assign the codewords, we arbitrarily
assign a bit of 1 to the top edge, and a bit of 0 to the bottom edge, of every pair of
edges. This results...
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Tài liệu A Concise Introduction to Data Compression- P3 pptx
Ngày tải lên :
14/12/2013, 15:15
... to tell you to how many figures I carried these computations, having
no other business at that time.
—Isaac Newton
To figure out the kind of compression achieved by arithmetic coding, we have to
consider ... www.verypdf.com to remove this watermark.
136 4. Arithmetic Coding
Today, we believe in the existence of atoms. If we start with a chunk of matter, cut it
into pieces, cut each piece into smaller ... image compression to a bi-level image
therefore means that the immediate neighbors of a pixel P tend to be identical to P .
Thus, it makes sense to use run-length encoding (RLE) to compress such...
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