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Use atomic set/clear bits in pmap_activate()/pmap_deactivate().

This commit is contained in:
thorpej 1998-03-22 07:27:54 +00:00
parent fcfe2f1539
commit a5260cbda0
1 changed files with 7 additions and 10 deletions
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17
sys/arch/alpha/alpha/pmap.old.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.old.c,v 1.65 1998/03/22 05:41:37 thorpej Exp $ */
/* $NetBSD: pmap.old.c,v 1.66 1998/03/22 07:27:54 thorpej Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -124,12 +124,6 @@
*
* - There is no locking protocol to speak of.
*
* - pmap_activate() and pmap_deactivate() are called
* from a critical section in locore, and cannot lock
* the pmap (because doing so may sleep). Thus, they
* must be rewritten to use ldq_l and stq_c to update
* the CPU mask.
*
* - ASN logic needs minor adjustments for multiple processors:
*
* - pmap_next_asn and pmap_asn_generation need
@ -173,7 +167,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: pmap.old.c,v 1.65 1998/03/22 05:41:37 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.old.c,v 1.66 1998/03/22 07:27:54 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1963,13 +1957,16 @@ pmap_activate(p)
/*
* Allocate an ASN.
*
* XXX This checks a non-per-cpu value (pm_lev1map), but we can't
* XXX lock!
*/
pmap_alloc_asn(pmap);
/*
* Mark the pmap in use by this processor.
*/
pmap->pm_cpus |= (1UL << alpha_pal_whami());
alpha_atomic_setbits_q(&pmap->pm_cpus, (1UL << alpha_pal_whami()));
PMAP_ACTIVATE(pmap, p);
}
@ -1997,7 +1994,7 @@ pmap_deactivate(p)
/*
* Mark the pmap no longer in use by this processor.
*/
pmap->pm_cpus &= ~(1UL << alpha_pal_whami());
alpha_atomic_clearbits_q(&pmap->pm_cpus, (1UL << alpha_pal_whami()));
}
/*