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Address-range Register
ADDRESS-RANGE REGISTERS (ARR) are control registers of the 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 . SEE ALSO * Write barrier * Page attribute table REFERENCES * ^ "Linux Kernel Driver Database". Linux Kernel Driver DataBase. Linux Kernel Driver DataBase. Retrieved 2009-09-27. This computer hardware article is a stub . You can help by expanding it
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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. CONTENTS * 1 In Garbage collection * 2 In Computer storage
Computer storage
* 3 See also * 4 References * 5 External links IN GARBAGE COLLECTIONA 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. IN COMPUTER STORAGE 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. 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. CONTENTS * 1 Processors * 2 See also * 3 References * 4 External links PROCESSORSThe PAT is available on Pentium III and newer CPUs, and on non-Intel CPUs. SEE ALSO * Write-combining REFERENCES * ^ "Intel 64 and IA-32 Architectures Software Developer\'s Manual Volume 3A: System Programming Guide, Part 1" (PDF). Intel
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Special
SPECIAL or SPECIALS may refer to: CONTENTS * 1 Music * 2 Film and television * 3 Other uses * 4 See also MUSIC * Special (album) , a 1992 album by Vesta Williams * "Special" (Garbage song) , 1998 * "Special" (Mew song) , 2005 * "Special" (Stephen Lynch song) , 2000 * The Specials
The Specials
, a British band * "Special", a song by Violent Femmes on The Blind Leading the Naked * "Special", a song on
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X86 Architecture
X86
X86
is a family of backward-compatible instruction set architectures based on the Intel
Intel
8086 CPU and its Intel
Intel
8088
8088
variant. The 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. The term "x86" came into being because the names of several successors to Intel's 8086 processor end in "86", including the 80186 , 80286 , 80386 and 80486
80486
processors. Many additions and extensions have been added to the x86 instruction set over the years, almost consistently with full backward compatibility
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Cyrix MII
The CYRIX 6 X86
X86
(codename M1) is a sixth-generation, 32-bit
32-bit
x86 -compatible microprocessor designed by Cyrix and manufactured by IBM and SGS-Thomson
SGS-Thomson
. It was originally released in 1996. CONTENTS * 1 Architecture * 2 Performance * 3 Models * 3.1 6x86 * 3.2 6x86L * 3.3 6x86MX / MII * 4 References * 5 Further reading * 6 External links ARCHITECTURE 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
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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. CONTENTS* 1 Control registers in x86 series * 1.1 CR0 * 1.2 CR1 * 1.3 CR2 * 1.4 CR3 * 1.5 CR4 * 1.6 CR5-7 * 2 Additional Control registers in x86-64 series * 2.1 EFER * 2.2 CR8 * 3 See also * 4 References * 5 External links CONTROL REGISTERS IN X86 SERIESCR0The 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. CR0 has various control flags that modify the basic operation of the processor
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Cyrix
CYRIX CORPORATION was a microprocessor developer that was founded in 1988 in Richardson, Texas
Richardson, Texas
, as a specialist supplier of math coprocessors for 286 and 386 microprocessors. The company was founded by Tom Brightman and Jerry Rogers. Cyrix
Cyrix
founder, President and CEO Jerry Rogers , aggressively recruited engineers and pushed them, eventually assembling a small but efficient design team of 30 people. Cyrix
Cyrix
merged with National Semiconductor
Semiconductor
on 11 November 1997. CONTENTS * 1 Products * 2 PR system * 3 Manufacturing partners * 4 Legal troubles * 5 Merger with National Semiconductor
Semiconductor
* 6 Legacy * 7 In popular media * 8 References * 9 External links PRODUCTS This section POSSIBLY CONTAINS ORIGINAL RESEARCH
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6x86
The CYRIX 6 X86
X86
(codename M1) is a sixth-generation, 32-bit
32-bit
x86 -compatible microprocessor designed by Cyrix and manufactured by IBM and SGS-Thomson . It was originally released in 1996. CONTENTS * 1 Architecture * 2 Revised cores * 3 Performance * 4 Cyrix MII * 5 References * 6 External links ARCHITECTURE 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. 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 and K5
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6x86MX
The CYRIX 6 X86
X86
(codename M1) is a sixth-generation, 32-bit
32-bit
x86 -compatible microprocessor designed by Cyrix and manufactured by IBM and SGS-Thomson
SGS-Thomson
. It was originally released in 1996. CONTENTS * 1 Architecture * 2 Revised cores * 3 Performance * 4 Cyrix MII * 5 References * 6 External links ARCHITECTURE 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
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ARR (other)
ARR or ARR may refer to: CONTENTS * 1 People * 2 Places * 3 Science and technology * 4 Transportation * 5 Other uses * 6 See also PEOPLE * Jonny Arr (born 1988), English rugby union player * 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 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 . SEE ALSO * Write barrier * Page attribute table REFERENCES * ^ "Linux Kernel Driver Database". Linux Kernel Driver DataBase. Linux Kernel Driver DataBase. Retrieved 2009-09-27. This computer hardware article is a stub . You can help by expanding it
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