kernel: handle tos and per process pcycle counters in port/

we might as well handle the per process cycle
counter in the portable part instead of duplicating the code
in every arch and have inconsistent implementations.

we now have a portable kenter() and kexit() function,
that is ment to be used in trap/syscall from user,
which updates the counters.

some kernels missed initializing Mach.cyclefreq.

1 files changed, 4 insertions, 38 deletions

diff --git a/sys/src/9/pc/trap.c b/sys/src/9/pc/trap.c
index c7dec7c13..584c25309 100644
--- a/sys/src/9/pc/trap.c
+++ b/sys/src/9/pc/trap.c
@@ -128,21 +128,6 @@ usertrap(int vno)
 	return 0;
 }
 
-/* go to user space */
-void
-kexit(Ureg*)
-{
-	uvlong t;
-	Tos *tos;
-
-	/* precise time accounting, kernel exit */
-	tos = (Tos*)(USTKTOP-sizeof(Tos));
-	cycles(&t);
-	tos->kcycles += t - up->kentry;
-	tos->pcycles = t + up->pcycles;
-	tos->pid = up->pid;
-}
-
 /*
  *  All traps come here.  It is slower to have all traps call trap()
  *  rather than directly vectoring the handler.  However, this avoids a
@@ -155,12 +140,7 @@ trap(Ureg* ureg)
 {
 	int vno, user;
 
-	user = userureg(ureg);
-	if(user){
-		up->dbgreg = ureg;
-		cycles(&up->kentry);
-	}
-
+	user = kenter(ureg);
 	vno = ureg->trap;
 	if(!irqhandled(ureg, vno) && (!user || !usertrap(vno))){
 		if(!user){
@@ -490,15 +470,12 @@ syscall(Ureg* ureg)
 	ulong scallnr;
 	vlong startns, stopns;
 
-	if(!userureg(ureg))
+	if(!kenter(ureg))
 		panic("syscall: cs 0x%4.4luX", ureg->cs);
 
-	cycles(&up->kentry);
-
 	m->syscall++;
 	up->insyscall = 1;
 	up->pc = ureg->pc;
-	up->dbgreg = ureg;
 
 	sp = ureg->usp;
 	scallnr = ureg->ax;
@@ -789,27 +766,16 @@ setregisters(Ureg* ureg, char* pureg, char* uva, int n)
 	ureg->ss |= 3;
 }
 
-static void
-linkproc(void)
-{
-	spllo();
-	up->kpfun(up->kparg);
-	pexit("kproc dying", 0);
-}
-
 void
-kprocchild(Proc* p, void (*func)(void*), void* arg)
+kprocchild(Proc *p, void (*entry)(void))
 {
 	/*
 	 * gotolabel() needs a word on the stack in
 	 * which to place the return PC used to jump
 	 * to linkproc().
 	 */
-	p->sched.pc = (ulong)linkproc;
+	p->sched.pc = (ulong)entry;
 	p->sched.sp = (ulong)p->kstack+KSTACK-BY2WD;
-
-	p->kpfun = func;
-	p->kparg = arg;
 }
 
 void