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Address-range Register
Address-range registers (ARR) are control registers of the Cyrix
Cyrix
6x86, 6x86MX
6x86MX
and MII processors that are used as a control mechanism which provides system software with control of how accesses to memory ranges by the CPU are cached, similar to what memory type range registers (MTRRs) provide on other implementations of the x86 architecture.[1] See also[edit]Write barrier Page attribute tableReferences[edit]^ "Linux Kernel Driver Database". Linux Kernel Driver DataBase. Linux Kernel Driver DataBase. Retrieved 2009-09-27. This computer hardware article is a stub
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Control Register
A control register is a processor register which changes or controls the general behavior of a CPU or other digital device. Common tasks performed by control registers include interrupt control, switching the addressing mode, paging control, and coprocessor control.Contents1 Control registers in x86 series1.1 CR0 1.2 CR1 1.3 CR2 1.4 CR3 1.5 CR4 1.6 CR5-72 Additional Control registers in x86-64 series2.1 EFER 2.2 CR83 See also 4 References 5 External linksControl registers in x86 series[edit] CR0[edit] The CR0 register is 32 bits long on the 386 and higher processors. On x86-64 processors in long mode, it (and the other control registers) is 64 bits long
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Cyrix
Cyrix
Cyrix
Corporation was a microprocessor developer that was founded in 1988 in Richardson, Texas, as a specialist supplier of math coprocessors for 286 and 386 microprocessors. The company was founded by Tom Brightman and Jerry Rogers
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6x86
The Cyrix
Cyrix
6x86 (codename M1) is a sixth-generation, 32-bit x86-compatible microprocessor designed by Cyrix
Cyrix
and manufactured by IBM and SGS-Thomson. It was originally released in 1996.Contents1 Architecture 2 Performance 3 Models3.1 6x86 3.2 6x86L 3.3 6x86MX / MII4 References 5 Further reading 6 External linksArchitecture[edit]A simplistic block diagram of the Cyrix
Cyrix
6x86 microarchitecture.The 6x86 is superscalar and superpipelined and performs register renaming, speculative execution, out-of-order execution, and data dependency removal.[1] However, it continued to use native x86 execution and ordinary microcode only, like Centaur's Winchip, unlike competitors Intel
Intel
and AMD
AMD
which introduced the method of dynamic translation to micro-operations with Pentium Pro
Pentium Pro
and K5
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6x86MX
The Cyrix 6x86 (codename M1) is a sixth-generation, 32-bit x86-compatible microprocessor designed by Cyrix and manufactured by IBM and SGS-Thomson. It was originally released in 1996.Contents1 Architecture 2 Performance 3 Models3.1 6x86 3.2 6x86L 3.3 6x86MX / MII4 References 5 Further reading 6 External linksArchitecture[edit]A simplistic block diagram of the Cyrix 6x86 microarchitecture.The 6x86 is superscalar and superpipelined and performs register renaming, speculative execution, out-of-order execution, and data dependency removal.[1] However, it continued to use native x86 execution and ordinary microcode only, like Centaur's Winchip, unlike competitors Intel and AMD which introduced the method of dynamic translation to micro-operations with Pentium Pro and K5. The 6x86 is socket-compatible with the Intel P54C Pentium, and was offered in six performance levels: PR 90+, PR 120+, PR 133+, PR 150+, PR 166+ and PR 200+
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Cyrix MII
The Cyrix
Cyrix
6x86 (codename M1) is a sixth-generation, 32-bit x86-compatible microprocessor designed by Cyrix
Cyrix
and manufactured by IBM and SGS-Thomson. It was originally released in 1996.Contents1 Architecture 2 Performance 3 Models3.1 6x86 3.2 6x86L 3.3 6x86MX / MII4 References 5 Further reading 6 External linksArchitecture[edit]A simplistic block diagram of the Cyrix
Cyrix
6x86 microarchitecture.The 6x86 is superscalar and superpipelined and performs register renaming, speculative execution, out-of-order execution, and data dependency removal.[1] However, it continued to use native x86 execution and ordinary microcode only, like Centaur's Winchip, unlike competitors Intel
Intel
and AMD
AMD
which introduced the method of dynamic translation to micro-operations with Pentium Pro
Pentium Pro
and K5
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X86 Architecture
x86 is a family of backward-compatible instruction set architectures[a] based on the Intel
Intel
8086
8086
CPU and its Intel
Intel
8088 variant. The 8086
8086
was introduced in 1978 as a fully 16-bit extension of Intel's 8-bit-based 8080 microprocessor, with memory segmentation as a solution for addressing more memory than can be covered by a plain 16-bit address
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Write Barrier
In operating systems, write barrier is a mechanism for enforcing a particular ordering in a sequence of writes to a storage system in a computer system. For example, a write barrier in a file system is a mechanism (program logic) that ensures that in-memory file system state is written out to persistent storage in the correct order.[1][2][3]Contents1 In Garbage collection 2 In Computer storage 3 See also 4 References 5 External linksIn Garbage collection[edit] A write barrier in a garbage collector is a fragment of code emitted by the compiler immediately before every store operation to ensure that (e.g.) generational invariants are maintained. A write barrier in a memory system, also known as a memory barrier, is a hardware-specific compiler intrinsic that ensures that all preceding memory operations "happen before" all subsequent ones.[citation needed] In Computer storage[edit]This section needs expansion. You can help by adding to it
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Page Attribute Table
The page attribute table (PAT) is a processor supplementary capability extension to the page table format of certain x86 and x86-64 microprocessors. Like memory type range registers (MTRRs), they allow for fine-grained control over how areas of memory are cached, and are a companion feature to the MTRRs.[1] Unlike MTRRs, which provide the ability to manipulate the behavior of caching for a limited number of fixed physical address ranges, Page Attribute Tables allow for such behavior to be specified on a per-page basis, greatly increasing the ability of the operating system to select the most efficient behavior for any given task.[2]Contents1 Processors 2 See also 3 References 4 External linksProcessors[edit] The PAT is available on Pentium III
Pentium III
and newer CPUs, and on non-Intel CPUs. See also[edit]Write-combiningReferences[edit]^ "Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3A: System Programming Guide, Part 1" (PDF)
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Special
Special
Special
or specials may refer to:Contents1 Music 2 Film and television 3 Other uses 4 See alsoMusic[edit] Special
Special
(album), a 1992 album by Vesta Williams "Special" (Garbage song), 1998 "Special
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ARR (other)
ARR or Arr may refer to:Contents1 People 2 Places 3 Science and technology 4 Transportation 5 Other uses 6 See alsoPeople[edit] Jonny Arr
Jonny Arr
(born 1988), English rugby union player A. R. Rahman
A. R

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Memory Type Range Register
Memory type range registers (MTRRs) are a set of processor supplementary capabilities control registers that provide system software with control of how accesses to memory ranges by the CPU are cached. It uses a set of programmable model-specific registers (MSRs) which are special registers provided by most modern CPUs. Possible access modes to memory ranges can be uncached, write-through, write-combining, write-protect, and write-back. In write-back mode, writes are written to the CPU's cache and the cache is marked dirty, so that its contents are written to memory later. Write-combining allows bus write transfers to be combined into a larger transfer before bursting them over the bus to allow more efficient writes to system resources like graphics card memory. This often increases the speed of image write operations by several times, at the cost of losing the simple sequential read/write semantics of normal memory
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Address-range Register
Address-range registers (ARR) are control registers of the Cyrix
Cyrix
6x86, 6x86MX
6x86MX
and MII processors that are used as a control mechanism which provides system software with control of how accesses to memory ranges by the CPU are cached, similar to what memory type range registers (MTRRs) provide on other implementations of the x86 architecture.[1] See also[edit]Write barrier Page attribute tableReferences[edit]^ "Linux Kernel Driver Database". Linux Kernel Driver DataBase. Linux Kernel Driver DataBase. Retrieved 2009-09-27. This computer hardware article is a stub
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