The 80386 CPU uses a two-level address translation mechanism to map logical addresses to physical addresses. It first uses segmentation to translate logical addresses to linear addresses, then uses paging to translate linear addresses to physical addresses. Paging involves using the page directory and page tables, which are stored in memory and map 4KB pages to physical addresses. The TLB cache is used to improve performance by storing recently used page table entries to avoid having to access memory for translation.
The Opcode or the operation code is the part of the instruction that specifies the operation to be performed by the instruction. The CPU decodes (understands) the instruction with the help of the opcode. Copy the link given below and paste it in new browser window to get more information on Operand and Opcode:- http://www.transtutors.com/homework-help/computer-science/computer-architecture/operand-and-opcode.aspx
The Opcode or the operation code is the part of the instruction that specifies the operation to be performed by the instruction. The CPU decodes (understands) the instruction with the help of the opcode. Copy the link given below and paste it in new browser window to get more information on Operand and Opcode:- http://www.transtutors.com/homework-help/computer-science/computer-architecture/operand-and-opcode.aspx
2015 course SPPU SEIT syllabus of subject Processor Architecture and Interfacing (PAI) This covers introduction to paging in 80386, Address Translation (Linear to physical), Page Level Protection,
The objectives of these slides are:
- To provide a detailed description of various ways of organizing memory hardware
- To discuss various memory-management techniques, including paging and segmentation
- To provide a detailed description of the Intel Pentium, which supports both pure segmentation and segmentation with paging
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)
Address translation-mechanism-of-80386 by aniket bhute
1. Address Translation Mechanism
of 80386
By Aniket Bhute
aniket.bhute96@gmail.com
G.H.RAISONI COLLEGE OF
ENGINEERING
(An Autonomous Institute Under UGC act 1956 & affiliated to R.T.M. Nagpur
University)
2. Protected Mode Addressing
Mechanism
• 80386 transforms logical addresses into physical
address two steps:
• Segment translation: a logical address is converted to
a linear address.
• Page translation: a linear address is converted to a
physical address.(optional)
• These translations are performed in a way that is not
visible to applications programmers.
16. Page Descriptor Base Register
• CR2 is used to store the 32-bit linear address
of page fault.
• CR3 (Page Directory Physical Base Address
Register) stores the physical starting address
of Page Directory.
17. Page Descriptor Base Register
• The lower 12 bits of CR3 are always zero to
ensure that the Page Directory is always page
aligned
• A move operation to CR3 automatically loads
the Page Table Entry caches and a task switch
through a TSS changes the value of CR0.
18. Page Directory
• It is at the most 4KB in size and allows upto
1024 entries are allowed.
• The upper 10 bits of the linear address are
used as an index to corresponding page
directory entry
• Page directory entry points to page tables.
20. Page Tables
• Each Page Table is 4KB and holds up to 1024 Page
Table Entries(PTE).
• PTEs contain the starting address of the page
frame and statistical information about the page.
• Upper 20 bit page frame address is concatenated
with the lower 12 bits of the linear address to
form the physical address.
• Page tables can be shared between tasks and
swapped to disks.
21. Page Table Entry
• P(Present)Bit: indicates if the entry can be
used in address translation. P-bit of the
currently executed page is always high.
• A (Accessed) Bit: It is set before any access to
the page.
22. Page Table Entry
• D (Dirty) bit: It is set before a write operation to
the page is carried out. The D bit is undefined for
PDEs.
• OS Reserved Bits: They are defined by the
operating system software.
• U/S (User/Supervisor)Bit and R/W (Read/Write)
Bit: They are used to provide protection. They
are decoded as
35. Translation Lookaside Buffer(TLB)
• Performance degrades if the processor access
two levels of tables for every memory
reference.
• To solve this problem, the Intel386 DX keeps a
cache of the most recently accessed pages and
this cache is called Translation Lookaside
Buffer (TLB).
• TLB is a 4 way set associative 32 entry page
table cache
37. Translation Lookaside Buffer(TLB)
• TLB has 4 sets of eight entries each.
• Each entry consists of a TAG and a DATA.
• Tags are 24 bit wide. They contain 20 upper
bits of linear address, a valid bit (Validation of
Entry) and three attribute bits(D,U/S and
R/W)
• Data portion of each entry contains upper 20
bits of the Physical address.
38. TLB Entry
V D U/S R/W Upper 20 bit Linear Address Upper 20-bit Physical Address
39. Translation Lookaside Buffer(TLB)
• It automatically keeps the most commonly
used Page Table Entries.
• 32-entry TLB coupled with a 4K page size
results in the coverage of 128KB of memory
addresses.
40. Paging Operation
• The paging unit hardware receives a 32-bit
linear address from the segmentation unit.
• The upper 20 linear address bits are compared
with all 32 entries in the TLB to determine if
there is a match.
• If there is a match (i.e. a TLB hit), then the 32-
bit physical address is calculated and will be
placed on the address bus.
41. Paging Operation
• If PTE entry is not in TLB, the 80386 DX will read
the appropriate PDE Entry.
• If P = 1 on PDE (the page table is in memory),
then the 80386 DX will read the appropriate PTE
and set the Access bit.
• If P = 1 on PTE ( the page is in memory), then
the Intel386 DX will update the Access and Dirty
bits as needed and fetch the operand.
42. Paging Operation
• The upper 20 bits of the linear address read
from the page table will be stored in the TLB
for future accesses.
• If P = 0 for either PDE or PTE, then the
processor will generate a page fault exception
• This exception is also generated when
protection rules are violated and the CR2 is
loaded with the page fault address
43. Linear Address
Upper 20 bits
available in TLB
P=1 in PDE?
P=1 in PTE?
N
N
N
Page Fault
Exception
Y (Page Table is present in physical
memory, set access bit)
(Page is present in physical
memory but entry is not there
in TLB,set A and D(if needed) )
Y
Update TLB
Paging Operation
Y
(Page is present in physical
memory, set A and D(if
needed))
45. Paging
Page 0
Page 1
Page 2
. . .
Page n
Page 0
Page 1
Page 2
. . .
Page m
linearvirtualaddress
spaceofProgram1
. . .
Hard Disk
Main Memory
Pages that cannot
fit in main memory
are stored on the
hard disk
Each running
program has
its own page
table
The operating
system uses
page tables to
map the pages
in the linear
virtual address
space onto
main memory
As a program is running, the processor translates the linear virtual addresses
onto real memory (called also physical) addresses
The operating
system swaps
pages between
memory and the
hard disk
linearvirtualaddress
spaceofProgram2