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Turn pmap_install_pte() into a critical section. We better not get

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interrupted while writing into the VHPT table. While here, make sure
memory accesses a properly ordered. Tag invalidation must happen
first so that the hardware VHPT walker will not be able to match
this entry while we're updating it and we have to make sure the new
new tag gets written only after the PTE is completely updated.

Approved by: re (blanket)
This commit is contained in:
Marcel Moolenaar 2003-05-19 08:02:36 +00:00
parent 3467e8b8a0
commit b8c4149cff
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=115152
1 changed files with 13 additions and 7 deletions
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20
sys/ia64/ia64/pmap.c
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@ -719,18 +719,24 @@ pmap_install_pte(struct ia64_lpte *vhpte, struct ia64_lpte *pte)
{
u_int64_t *vhp, *p;
/* invalidate the pte */
atomic_set_64(&vhpte->pte_tag, 1L << 63);
ia64_mf(); /* make sure everyone sees */
vhp = (u_int64_t *)vhpte;
p = (u_int64_t *)pte;
vhp = (u_int64_t *) vhpte;
p = (u_int64_t *) pte;
critical_enter();
/* Invalidate the tag so the VHPT walker will not match this entry. */
vhp[2] = 1UL << 63;
ia64_mf();
vhp[0] = p[0];
vhp[1] = p[1];
vhp[2] = p[2]; /* sets ti to one */
ia64_mf();
/* Install a proper tag now that we're done. */
vhp[2] = p[2];
ia64_mf();
critical_exit();
}
/*