Author: andrew
Date: Tue Sep 8 18:41:06 2015
New Revision: 287570
URL: https://svnweb.freebsd.org/changeset/base/287570
Log:
Add support for pmap_mincore on arm64 by walking the page tables to find
the details for the requested address.
PR: 202307
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/arm64/arm64/pmap.c
Modified: head/sys/arm64/arm64/pmap.c
==============================================================================
--- head/sys/arm64/arm64/pmap.c Tue Sep 8 18:37:16 2015 (r287569)
+++ head/sys/arm64/arm64/pmap.c Tue Sep 8 18:41:06 2015 (r287570)
@@ -3032,8 +3032,74 @@ pmap_page_set_memattr(vm_page_t m, vm_me
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;
+
+ 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);
- panic("ARM64TODO: pmap_mincore");
+ return (val);
}
void
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