The Linux kernel mapping fixed resolution?

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    The new version of the kernel for stored in IDTR register is the kernel of IDT table of addresses to use fixed mapping of linear addresses, so here to fix the kernel mapping addressing mechanism to describe.
Firstly ,Fixed concept mapping
The initial part of the kernel linear addresses the fourth GB of physical memory mapping system. But at least 128 MB of linear addresses is always reserved for he, as the kernel using the linear address mapping of discontinuous memory allocation and fixation of linear addresses.
Secondly, fix-mapped linear address
Each fixed linear address mapping has fixed addresses the index of the structure to specify

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