Question 17: Which of the following actions are performed by userinit…

1void userinit(void)
2{
3  struct proc *p;
4
5  p = allocproc();
6  initproc = p;
7
8  // allocate one user page and copy initcode's instructions
9  // and data into it.
10  uvmfirst(p->pagetable, initcode, sizeof(initcode));
11  p->sz = PGSIZE;
12
13  // prepare for the very first "return" from kernel to user.
14  p->trapframe->epc = 0;      // user program counter
15  p->trapframe->sp = PGSIZE;  // user stack pointer
16
17  safestrcpy(p->name, "initcode", sizeof(p->name));
18  p->cwd = namei("/");
19
20  p->state = RUNNABLE;
21
22  release(&p->lock);
23}