Protection Mode
(Protected mode, or sometimes pmode) is a 80286 series and later x86 compatible CPU
Operation Mode. The protection mode has some new features and is designed to enhance the stability of multiple workers and systems, such as memory protection, paging systems, and virtual memory supported by hardware. Most of today's x86
Operating systems are all r
1 Development Status of relay protection
The rapid development of power systems puts forward new requirements for relay protection. The rapid development of electronic technology, computer technology and communication technology has continuously injected new vigor into the development of relay protection technology, therefore, the relay
Floating-point or wait/fwait directives
8
#DF
Double error
Abort
Have (0)
All can produce anomalies or nmi or intrThe instructions
9
Coprocessor segment out of bounds (reserved)
Fault
No
Floating point Instruction (386 no longer handles thisexception
10
#TS
Invalid TSS
Fault
Yes
Task switching or when visiting TSS
11
#NP
Segment does not exist
Fault
Yes
When you l
the label_desc_code32 descriptor.
XOR eax, eaxMoV ax, DSSHL eax, 4Add eax, label_gdt; eax MoV DWORD [gdtptr + 2], eax; [gdtptr + 2]
This section serves the same purpose as label_desc_code32 initialization above. The base address of the corresponding data segment in protection mode is calculated based on the DS value in real mode.Then pass the gdt base address to gdtptr + 2 for the following lgdt call, that is, the unknown dd location.
Gdtptr has a t
it possible to load and execute multiple tasks at the same time. Second, the segmentation mechanism makes the segments have access permissions and privileges. the operating system code and data cannot be accessed by applications, this effectively isolates the operating system from applications.
1. segmentation mechanism and segment expression tableIn protection mode, the address format of "segment: offset" in actual mode is continued, but the meaning
Chapter 3 section 1 is "Awareness protection model", preliminaryThis section describes the Global Descriptor Table gdt, segment descriptor, segment Selection Sub-table in protection mode, and entry into protection mode from real mode. When I read this last year, if I did not take notes when I used to study the protection
)
Fault
No
Floating-point instruction (the CPU does not produce this exception after 386)
10
#TS
Invalid task status Segment TSS
Fault
Yes
Task Exchange or access to TSS
11
#NP
Segment does not exist
Fault
Yes
Load segment registers or access system segments
12
#SS
Stack segment Error
Fault
Yes
Stack operations and
Copyright law protects the limitations of computer software
(i) Copyright law protects the mainstream of computer software in the late 80, many countries, led by the United States, began to amend copyright law to incorporate computer software into the protection object of copyright law. In the December 1980, the United States amended the Copyright law, formally confirmed that the computer software as a general writing works of copyright law
Text/graph TC-XB==========================================Shared data protection expert is a powerful file protection software. After using it to encrypt a folder, you can only browse the Word, Excel, or image files in the folder, files in the folder cannot be modified or copied. The software is quite convenient to use, but there are some restrictions without registration. Let's try to analyze the software.
High-availability systems, such as servers, network switches, redundant storage disk arrays (RAID), and other forms of communication infrastructure, require close to 0 downtime throughout the lifecycle of their use. If a component of such a system fails or needs to be upgraded, it must be replaced without interrupting the rest of the system, where the faulty board or module is removed while the system is running, and the replacement part is inserted. This process is known as hot swapping (also k
. 2. Maintain multiple process switching information. The A.GDTR register points to the GDT's first address in memory.Use the content in Cs,ds as segment selector.B.CS the top 13 digits as index, the lowest 2 bits used to determine whether the CPU is running at 0 or 3 (DPL), and the remaining one indicates access GDT or LDT.Gdt/ldt table entries have DPL, the CPU to access it when compared to the minimum two bits and GDT table entries in the DPL, passed the check to continue access. The C.TSS (s
Arm3.61 enhanced IAT decoding protection. Here we only talk about the protection code tracking experience before IAT decoding.The program used this time is goodmorning issued in http://tongtian.net/pediybbs/viewtopic.php? T = 5395 sid = 9f24b627dcfe6d35be45f9f2244142a7Armadillo 3.70 full version plus notepad.The previous steps are just fixed. Don't say anything ......After I modified the code from bp OpenM
If the operating system does not use the multi-tasking mechanism of the processor, it still needs to create at least one TSS for the stackWhen the program changes the privilege level by calling the gate, the processor performs the following steps to switch the stack, and executes the called program at the new privileged level1. Use DPL from the target snippet to select the stack segment selector and stack pointer from the TSS2. Read the switched stack segment selector and stack pointer from the
Three-stage current protectionThree-stage fixed time overcurrent protection each section action current fixed value and the action time fixed value can be independently set, each section overcurrent protection uses the same action discrimination logic, the action export condition is:
For the nth segment of the current set value
Three-stage protection
Protection Mode Overview
From: http://www.pagoda-ooos.org/
In the 8086/8088 era, there was only one operating mode for the processor. At that time, this mode was not named because there were no other operating modes. Since 80286 to 80386, the processor has added two more operating modes: protection mode PM (Protected Mode) and system management mode SMM (System Management Mode). Therefore, 8086/8088 of the
Protection Mode Overview
From: http://www.pagoda-ooos.org/
In the 8086/8088 era, there was only one operating mode for the processor. At that time, this mode was not named because there were no other operating modes. Since 80286 to 80386, the processor has added two more operating modes: protection mode PM (Protected Mode) and system management mode SMM (System Management Mode). Therefore, 8086/8088 of the
Source: Lithium Battery Protection Board basic knowledgeFirst, the origin of the protection plateLithium-ion batteries (rechargeable) need to be protected, it is determined by its own characteristics. As the material of the lithium battery itself determines that it can not be overcharge, over-discharge, over-current, short-circuit and ultra-high temperature charge and discharge, lithium battery components w
First, the introduction
Automatic Switched Optical Network (ASON) is a new generation of optical transmission network technology which is constantly adapting to the rapid development of the business. Ason Network as a distributed intelligent optical transport network, its biggest feature is in the transmission plane and management plane based on the introduction of intelligent control plane, the use of signaling, routing, automatic discovery and other technologies. The introduction of Ason tech
I have read two articles about hard disk protection card cracking (restoring the card to the final article: Rongke,), and I will share with you the benefits of the broken protection card with the existing machines in the machine room.As mentioned in the previous two articles, you can use 'T' in debug to record the original int13h entry f000: xxxx.What I want is to enable it to automatically enter the origin
The has done some theoretical groundwork before, and this time we can look at the code. One, code listing
; listing 11-1; filename: c11_mbr.asm; File Description: Hard drive main boot sector code; Date Created: 2011-5-16 19:54; set stack segments and stack pointers MOV ax,cs mov ss,ax mov sp,0x7c00; calculate the logical segment of the GDT address mov ax,[cs:g DT_BASE+0X7C00]; Low 16-bit MOV dx,[cs:gdt_base+0x7c00+0x02]; high 16-bit MOV b
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