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Add support for pmap_mincore on arm64 by walking the page tables to find

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the details for the requested address.

PR:		202307
Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Andrew Turner 2015-09-08 18:41:06 +00:00
parent 9e3e3fe5b3
commit 384dd3be15
1 changed files with 67 additions and 1 deletions
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68
sys/arm64/arm64/pmap.c
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@ -3032,8 +3032,74 @@ pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma)
int
pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa)
{
pd_entry_t *l1p, l1;
pd_entry_t *l2p, l2;
pt_entry_t *l3p, l3;
vm_paddr_t pa;
bool managed;
int val;
panic("ARM64TODO: pmap_mincore");
PMAP_LOCK(pmap);
retry:
pa = 0;
val = 0;
managed = false;
l1p = pmap_l1(pmap, addr);
if (l1p == NULL) /* No l1 */
goto done;
l1 = pmap_load(l1p);
if ((l1 & ATTR_DESCR_MASK) == L1_BLOCK) {
pa = (l1 & ~ATTR_MASK) | (addr & L1_OFFSET);
managed = (l1 & ATTR_SW_MANAGED) == ATTR_SW_MANAGED;
val = MINCORE_SUPER | MINCORE_INCORE;
if (pmap_page_dirty(l1))
val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER;
if ((l1 & ATTR_AF) == ATTR_AF)
val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER;
goto done;
}
l2p = pmap_l1_to_l2(l1p, addr);
if (l2p == NULL) /* No l2 */
goto done;
l2 = pmap_load(l2p);
if ((l2 & ATTR_DESCR_MASK) == L2_BLOCK) {
pa = (l2 & ~ATTR_MASK) | (addr & L2_OFFSET);
managed = (l2 & ATTR_SW_MANAGED) == ATTR_SW_MANAGED;
val = MINCORE_SUPER | MINCORE_INCORE;
if (pmap_page_dirty(l2))
val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER;
if ((l2 & ATTR_AF) == ATTR_AF)
val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER;
goto done;
}
l3p = pmap_l2_to_l3(l2p, addr);
if (l3p == NULL) /* No l3 */
goto done;
l3 = pmap_load(l2p);
if ((l3 & ATTR_DESCR_MASK) == L3_PAGE) {
pa = (l3 & ~ATTR_MASK) | (addr & L3_OFFSET);
managed = (l3 & ATTR_SW_MANAGED) == ATTR_SW_MANAGED;
val = MINCORE_INCORE;
if (pmap_page_dirty(l3))
val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER;
if ((l3 & ATTR_AF) == ATTR_AF)
val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER;
}
done:
if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) !=
(MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) && managed) {
/* Ensure that "PHYS_TO_VM_PAGE(pa)->object" doesn't change. */
if (vm_page_pa_tryrelock(pmap, pa, locked_pa))
goto retry;
} else
PA_UNLOCK_COND(*locked_pa);
PMAP_UNLOCK(pmap);
return (val);
}
void