kstack             57 kernel/proc.c      p->kstack = KSTACK((int)(p - proc));
kstack            147 kernel/proc.c    p->context.sp = p->kstack + PGSIZE;
kstack             96 kernel/proc.h    uint64 kstack;               // Virtual address of kernel stack
kstack            117 kernel/trap.c    p->trapframe->kernel_sp = p->kstack + PGSIZE; // process's kernel stack