StackOverflow2013

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plurals

PO
primarykey
Id
16519396
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-05-13T10:02:58.490
FavoriteCount
0
LastActivityDate
2013-05-14T02:07:54.113
LastEditDate
2013-05-14T02:07:54.113
LastEditorUserId
1196716
OwnerUserId
1196716
ParentId
11698159
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
Intel support 3 kinds of addresses: logical address --(segment unit)---> linear address ---(paging unit)---> physical address as you know, all kernel and user code access data or text thought virtual address (logical address in CPU). The address is translated into linear address as the following graph: <img src="https://i.stack.imgur.com/GCm96.png" alt="enter image description here"> As linux implementation does not support the concept of linear addressing and the segments is only provided for permission control. Linux kernel configures each segment's offset value to zero. That is why you can't see the linear address in kernel and kernel directly use virtual address on paging units. After getting the linear address, the MMU paging unit reference CR3 register to get base of paing table to generate physical address. <img src="https://i.stack.imgur.com/JYL2C.png" alt="enter image description here"> The same with cpu cache, the paging unit also has a TLB cache per CPU core to speed up the address translation that performed on memory. Reference: <a href="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CC8QFjAA&url=http://download.intel.com/products/processor/manual/253668.pdf&ei=wJyRUYT3J8qOlQXDioDQCA&usg=AFQjCNFP1iEex4YiE1Wcf2tDuab5OV_plQ&sig2=zY0t1bm-mt24BRz1pnYDiw&bvm=bv.46471029,d.dGI&cad=rja" rel="nofollow noreferrer">intel64 software developer's manual</a>
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singulars
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1. This table or related slice is empty.
PostParentId
1. POglobal or local linear address space in Linux?
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USHoucheng
UserOwnerUserId
1. USHoucheng
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2. VO
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