kernel virtual address translation

Considering Linux and 32 bit x86 arch there is 3:1 divide of the accessible 4GB address space. The user space is allocated 0-3 Gb while 3-4 Gb is allocated to kernel. How does a virtual address that is greater than 3Gb and hence lies开发者_C百科 into the kernel address space is transformed to the physical address? Does page tables would come into picture?

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There is some information in Mel Gorman's book Understanding the Linux Virtual Memory Manager.

The short answer: Yes, the kernel sets up page tables to translate physical address 0 to virtual address 3 GiB. (Section 3.7.1). This includes the physical location the kernel was loaded to (usually 1MB on x86).