We are using Windows every day, but are you familiar with its system files? The so-called system files generally refers to the windows are closely related to the normal operation of the system can not be separated from the files. Most of these files are located under the System32 directory (X:\Windows\System32\) and the System file backup directory Dllcache (X:\Windows\System32\Dllcache\) ("X" is the partition where your XP system is located. They are generally in the form of DLL files, followed
1011B, it indicates a Busy task. The task will not be recursive. The processor uses Busy-FLag to detect a task that has been interrupted, to ensure that a Busy-Flag is only related to one task, each TSS should have only one TSS descriptor pointing to it
The base address, segment boundary, DPL, G, and P functions are similar to those used in data segment descriptors. In 32-bit TSS, if the G of the TSS descriptor is 0, the limit value must be greater than or equal to 67 h, and the minimum size o
other three doors point to a subroutine, so the combination of the segment selection code and the intra-segment displacement;(5) Intel implements a very complex prioritization mechanism in I386CPU, in which the CPL is less than or equal to DPL, which is the gate (usually the interrupt gate) compared to the CPL of the CPU. Then, in the target snippet description, the DPL and
Linux2.6's support for new CPU fast system calls-Linux general technology-Linux programming and kernel information. The following is a detailed description. This article analyzes the implementation of the Intel CPU quick System Call Command SYSENTER/SYSEXIT introduced in Linux 2.6. Linux drivers and kernel developers can use this mechanism in their own code to improve system performance by understanding the mechanism of fast System Call commands, it also avoids some limitations caused by the fas
Shell statement usage tips 1. Are you anxious to call the system "create shortcuts" Wizard to create shortcuts that VB does not support? Although you can call the fcreateshelllink function in vb5stkit. dll,
But it is designed for the installer. The default path of the shortcut always starts from the current user's "/Start Menu/programs", that is,
If your Windows 95 is attached to drive C, you cannot use the fcreateshelllink function to create a shortcut to drive D. Now, we will introduce you to
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Support for fast system calls of new CPUs in Linux 2.6Reposted from: ibmdeveloperworks China
Liu ZuiLinux enthusiastsMay 2004
This article analyzes the implementation of the Intel CPU quick System Call Command sysenter/sysexit introduced in Linux 2.6. Linux drivers and kernel developers can use this mechanism in their own code to improve system performance by understanding the mechanism of fast System Call commands, it also avoids some limitations caused by the
read operation is executed.
This command is introduced in the Intel (r) architecture's Pentium (r) processor.Operation
If (cr4.tsd timestampcounter;Else (* CR4 is 1 and CPL is 1, 2, or 3 *)# GP (0)FI;Indicator of impact
None.Protection Mode exception
# GP (0)-if the TSD flag in register CR4 is set to 1 and CPL is greater than 0.The real address mode is abnormal.
# GP-if the TSD flag in register CR4 is set
-friendly services and fully meet the interests of service providers. The challenge is that the application server must handle the security of service access in an Internet open environment.
Fifth, avoid, detect, and resolve business conflicts. With the proliferation of business types and quantities in the Next Generation Network, the possibility of conflicts between businesses also increases rapidly. In this context, the business conflict management function is particularly important. To separa
example, the read/write interrupt control allows registers, but the compiler does not check and analyze the online assembly language. inserting the online assembly language may cause serious errors when changing the Assembly environment or changing the value of the C variable.
Change in addressing methods in assembly 2 and C interfaces:
Note that in the C language, local variable creation and access are implemented through the stack, and its addressing is implemented through the stack register
To meet this requirement, you must program and modify the image of the System user, that is, the image displayed on the welcome page when logging on to XP, Vista, and win7 systems.
Find and ask. There are still no unified solutions and solutions, but there are some gains, as listed below:
1. There is a registry key under XP to save this path:
[HKEY_LOCAL_MACHINE/software/Microsoft/Windows/CurrentVersion/hints/Administrator]"Picturesource" = "C: // Documents and Settings // All Users // Applic
/system32" directory of the computer. It allows programs to share the code and other resources necessary to perform special tasks. Many of the applications we use today are not a complete, indivisible, monolithic executable, but consist of a number of dynamically-linked library files that are fragmented and relatively independent. This coincides with object-oriented thinking, which increases the ER reusability of code and facilitates the maintenance and extension of code. ClassificationSome of t
Do you remember. We implement the transfer of privilege level from low to high with call gate and lcall instruction.
Let's say we want to move code A to code B, using a call gate G, which refers to a segment of the code B in the target selector in Call Gate G. In fact, we have to consider 4 elements: CPL, RPL, Dpl_b (DPL of Code B), Dpl_g (call Gate G DPL).
In the first step, when a accesses call gate G, the rule is equivalent to accessing a data segm
-name "*" |xargs grep "wl0505" > ~/thefile
Grep-rn wl0505/etc/*
Find/-name "*.*" | Xargs grep "wl0505" >>/home/filename*.* is the filename and extension,>> to redirect the results to a file in the following path, not displayed on the terminal.
"*" indicates a line matching the character with * means to find the file with * and print the line found./-maxdepth 1 | grep "*" find./-maxdepth 1 | grep * These two commands are equivalent to grep, he only accepts regular expression matches *? These c
Vista system directory "c:windowssystem32" folder, click "Start → Control Panel" and select "Classic View" on the left, and you will see a new "desktop" entry (with the same name as the Control Panel item in XP). When you want to use the XP-style Desktop Properties Settings window, double-click the "desktop" item. The first run will pop up the window and ask if the Control Panel program is working properly. If normal, click "This control panel works properly" in the prompt box to confirm it.
S
. Group Policy method
Although you can't add feature icons, rename icons, or change their appearance in Control Panel, you can remove unwanted icons. The method is to select "Start" * "Search" * "Files or Folders" (in Windows 2000/me), or "Start" * "Search" (in Windows XP). In the first text box in the left panel of the Search Results window, enter "*.cpl", specify the relevant path in the search scope, and click the "Search Now" or "search" button.
lower than the CPL, the RPL covers the CPL. This way even if the segment of the visitor has sufficient privilege level but RPLNot enough to access high-privileged data. Prevent low privilege levels from constructing high privilege level selectors to access high privilegeLevel of data (the current RPL will be placed in the RPL of the selector).
If the target code snippet has a low privilege level, it cannot
We can finally look at the code of the 14th chapter by doing so much of the groundwork.For the boot code and user program, still use the 13th chapter, for the kernel program (C14_CORE.ASM), compile a few lines of error, as long as the addition dword can be resolved.1. Why use the call gateIn the 13th chapter, in order to be able to use the kernel-provided routines, the user program is call far transferred directly to the kernel routines (non-Uniform Code snippets) with instructions. Because
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