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arm64: Enhance pmap_pte_exists()'s error reporting

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Report the descriptor type and level at which the page table does not
match the caller's expectations.

MFC after:	1 week
This commit is contained in:
Alan Cox 2021-12-28 17:17:42 -06:00
parent 0ecda8d5ae
commit 3c2ee7b28c
1 changed files with 11 additions and 4 deletions
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15
sys/arm64/arm64/pmap.c
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@ -607,6 +607,7 @@ pmap_pte_exists(pmap_t pmap, vm_offset_t va, int level, const char *diag)
{
pd_entry_t *l0p, *l1p, *l2p;
pt_entry_t desc, *l3p;
int walk_level __diagused;
KASSERT(level >= 0 && level < 4,
("%s: %s passed an out-of-range level (%d)", __func__, diag,
@ -628,11 +629,17 @@ pmap_pte_exists(pmap_t pmap, vm_offset_t va, int level, const char *diag)
desc = pmap_load(l3p) & ATTR_DESCR_MASK;
if (desc == L3_PAGE && level == 3)
return (l3p);
}
}
}
else
walk_level = 3;
} else
walk_level = 2;
} else
walk_level = 1;
} else
walk_level = 0;
KASSERT(diag == NULL,
("%s: va %#lx is not mapped at level %d", diag, va, level));
("%s: va %#lx not mapped at level %d, desc %ld at level %d",
diag, va, level, desc, walk_level));
return (NULL);
}