Virtual memory question

[Naman shekhar Mishra]

Is the last gigabyte in the virtual address space of each process mapped to the same memory location (which starts from the 2nd megabyte of physical RAM)? And, what happens when a process makes a system call - does the kernel work on behalf of the process, i.e. use the process page tables, or uses its own page tables for virtual addressing. If the former is true, when are the kernel page tables used?
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