Physic notes

Introductory Physics Books Robert G.

Physic notes

History[ edit ] PAE was first implemented in the Intel Pentium Pro in[3] although the accompanying chipsets usually lacked support for the required extra address bits. When the x processor is initialized, the PAE feature is required to be enabled before the processor is switched from Legacy Mode to Long Mode.

Physic notes

This allows more room for the physical page address, or "page frame number" field, in the page table entry. In the initial implementations of PAE the page frame Physic notes field was expanded from 20 to 24 bits. In the first processors that supported PAE, support for larger physical addresses is evident in their package pinout, with address pin designations going up to A35 instead of stopping at A The mapping is typically applied separately for each processso that the additional RAM is useful even though no single process can access it all simultaneously.

Later work associated with AMD's development of x architecture expanded the theoretical possible size of physical addresses to 52 bits.

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However, the size of each table does not change, so both table and directory now have only entries. Because this allows only one half of the entries of the original scheme, an extra level of hierarchy has been added, so CR3 now points physically to a Page Directory Pointer Table, a short table containing four pointers to page directories.

In all page table formats supported by x86 and xthe 12 least significant bits of the page table entry are either interpreted by the memory management unit or are reserved for operating system use. The next eleven most significant bits bits 52 through 62 are reserved for operating system use by both Intel and AMD's architecture specifications.

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This textbook has a design that is just about perfectly backwards compared to most textbooks that currently cover the subject. Topics covered includes: Elementary Mechanics, Newton’s Laws, Systems of Particles, Momentum and Collisions, Torque and Rotation in One Dimension, Applications of Mechanics, Fluids, Oscillations, Wave Equation and Gravity.

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