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page-table base register

The special register that holds the physical address of the current program's top-level page table; switching programs changes it.

The page-table base register (x86-64 cr3, ARM64 TTBR0_EL1 for the lower half and TTBR1_EL1 for the kernel half, RISC-V satp) holds the physical address of the root table of the active address space; writing it is a privileged operation.

See also

page table physical address base register address space
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