merge proc_trampoline and child_trampoline as has been done on amd64

Author: drahn

sys/arch/arm64/arm64/cpuswitch.S

@@ -90,18 +90,6 @@ ENTRY(cpu_switchto)
 	ret
 
 ENTRY(proc_trampoline)
-#ifdef MULTIPROCESSOR
-	bl _C_LABEL(proc_trampoline_mp)
-#endif
-	// call it or just set the variable?
-	mov x0, IPL_NONE
-	bl spllower
-	mov x0, x20
-	blr x19
-	b .
-	
-
-ENTRY(child_trampoline)
 #ifdef MULTIPROCESSOR
 	bl _C_LABEL(proc_trampoline_mp)
 #endif

sys/arch/arm64/arm64/vm_machdep.c

@@ -95,10 +95,7 @@ cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
 	sf = (struct switchframe *)tf - 1;
 	sf->sf_x19 = (uint64_t)func;
 	sf->sf_x20= (uint64_t)arg;
-	if (p2->p_pid == 1)
-		sf->sf_lr = (u_int64_t)&proc_trampoline;
-	else
-		sf->sf_lr = (u_int64_t)&child_trampoline;
+	sf->sf_lr = (u_int64_t)&proc_trampoline;
 	pcb->pcb_sp = (uint64_t)sf;
 }