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Tweak the "ffs" code in cpu_switch so we can ditch __HAVE_MD_RUNQUEUE.

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This commit is contained in:
scw 2002-10-09 20:27:35 +00:00
parent 8e4950499d
commit 4401a03fd4
3 changed files with 9 additions and 44 deletions
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3
sys/arch/sh5/include/types.h
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@ -1,4 +1,4 @@
/* $NetBSD: types.h,v 1.3 2002/09/22 08:31:01 simonb Exp $ */
/* $NetBSD: types.h,v 1.4 2002/10/09 20:27:35 scw Exp $ */
/*
* Copyright 2002 Wasabi Systems, Inc.
@ -77,7 +77,6 @@ typedef struct label_t {
#define __HAVE_DEVICE_REGISTER
#define __HAVE_GENERIC_SOFT_INTERRUPTS
#define __HAVE_SYSCALL_INTERN
#define __HAVE_MD_RUNQUEUE
#ifdef notyet
#define __HAVE_AST_PERPROC /* Not reqd. until we support SMP */

13
sys/arch/sh5/sh5/cpu_switch.S
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@ -1,4 +1,4 @@
/* $NetBSD: cpu_switch.S,v 1.11 2002/10/08 15:59:32 scw Exp $ */
/* $NetBSD: cpu_switch.S,v 1.12 2002/10/09 20:27:35 scw Exp $ */
/*
* Copyright 2002 Wasabi Systems, Inc.
@ -312,10 +312,11 @@ Lsw2:
* Interrupts are blocked, sched_lock is held, and r0 contains
* the contents of a non-zero sched_whichqs.
*/
addz.l r0, r63, r0 /* Correct for sign extension */
nsb r0, r1 /* Count sign bits in r0 */
addi r1, -31, r1 /* Correct for 64-bitness of "nsb" */
xori r1, 31, r1 /* Convert to range 31-0 */
addi r0, -1, r1 /* Slightly modified ffs(r0) */
andc r0, r1, r1
nsb r1, r1
addi.l r1, -62, r1 /* We know r0 != 0, so this works */
sub.l r63, r1, r1 /* Result in r1 */
movi 1, r2
shlld r2, r1, r2 /* Set appropriate bit in r2 */
andc r0, r2, r5 /* Assume queue is empty, in r5 */
@ -336,7 +337,7 @@ Lsw2:
* Remove process from head of run queue
*/
LDPTR r3, PH_LINK, r2 /* r2 = victim process, p */
beq/u r2, r63, tr0 /* Queue was empty! Panic stations! */
beq/u r2, r3, tr0 /* Queue was empty! Panic stations! */
LDPTR r2, P_FORW, r4 /* r4 = p->p_forw */
STPTR r3, PH_LINK, r4 /* queue->ph_link = p->p_forw */
STPTR r4, P_BACK, r3 /* p->p_forw->p_back = queue */

37
sys/arch/sh5/sh5/process_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: process_machdep.c,v 1.5 2002/09/28 11:11:01 scw Exp $ */
/* $NetBSD: process_machdep.c,v 1.6 2002/10/09 20:27:35 scw Exp $ */
/*
* Copyright 2002 Wasabi Systems, Inc.
@ -111,41 +111,6 @@ setregs(struct proc *p, struct exec_package *pack, u_long stack)
&p->p_addr->u_pcb);
}
void
setrunqueue(struct proc *p)
{
int queue = p->p_priority >> 2;
#ifdef DIAGNOSTIC
if (p->p_back != NULL)
panic("setrunqueue");
#endif
sched_whichqs |= (1 << queue);
p->p_forw = (struct proc *)&sched_qs[queue];
p->p_back = sched_qs[queue].ph_rlink;
p->p_back->p_forw = p;
sched_qs[queue].ph_rlink = p;
}
void
remrunqueue(struct proc *p)
{
int queue = p->p_priority >> 2;
#ifdef DIAGNOSTIC
if ((sched_whichqs & (1 << queue)) == 0)
panic("remrunqueue");
#endif
p->p_back->p_forw = p->p_forw;
p->p_forw->p_back = p->p_back;
p->p_back = NULL;
if ((struct proc *)&sched_qs[queue] == sched_qs[queue].ph_link)
sched_whichqs &= ~(1 << queue);
}
int
process_read_regs(struct proc *p, struct reg *regs)
{