Question 22: Consider the following code for kvminit function in vm. …

1 1  void
2 2  kvminit()
3 3  {
4 4    kernel_pagetable = (pagetable_t) kalloc();
5 5    memset(kernel_pagetable, 0, PGSIZE);
6 6
7 7    kvmmap(UART0, UART0, PGSIZE, PTE_R | PTE_W);
8 8
9 9    kvmmap(VIRTION(0), VIRTION(0), PGSIZE, PTE_R | PTE_W);
1010
1111    kvmmap(VIRTION(1), VIRTION(1), PGSIZE, PTE_R | PTE_W);
1212
1313    kvmmap(CLINT, CLINT, 0x10000, PTE_R | PTE_W);
1414
1515    kvmmap(PLIC, PLIC, 0x400000, PTE_R | PTE_W);
1616
1717    kvmmap(KERNBASE, KERNBASE, (uint64)etext-KERNBASE, PTE_R | PTE_X);
1818
1919    kvmmap((uint64)etext, (uint64)etext, PHYSTOP-(uint64)etext, PTE_R | PTE_W);
2020
2121    kvmmap(TRAMPOLINE, (uint64)trampoline, PGSIZE, PTE_R | PTE_X);
2222  }