Author: markj Date: Wed Jul 25 15:58:14 2018 New Revision: 336714 URL: https://svnweb.freebsd.org/changeset/base/336714
Log: Simplify the arm64 implementation of pmap_mincore(). No functional change intended. Reviewed by: alc MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D16427 Modified: head/sys/arm64/arm64/pmap.c Modified: head/sys/arm64/arm64/pmap.c ============================================================================== --- head/sys/arm64/arm64/pmap.c Wed Jul 25 15:45:42 2018 (r336713) +++ head/sys/arm64/arm64/pmap.c Wed Jul 25 15:58:14 2018 (r336714) @@ -5074,76 +5074,45 @@ pmap_demote_l2(pmap_t pmap, pt_entry_t *l2, vm_offset_ 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; + pt_entry_t *pte, tpte; + vm_paddr_t mask, pa; + int lvl, val; bool managed; - int val; PMAP_LOCK(pmap); retry: - pa = 0; val = 0; - managed = false; + pte = pmap_pte(pmap, addr, &lvl); + if (pte != NULL) { + tpte = pmap_load(pte); - l1p = pmap_l1(pmap, addr); - if (l1p == NULL) /* No l1 */ - goto done; + switch (lvl) { + case 3: + mask = L3_OFFSET; + break; + case 2: + mask = L2_OFFSET; + break; + case 1: + mask = L1_OFFSET; + break; + default: + panic("pmap_mincore: invalid level %d", lvl); + } - l1 = pmap_load(l1p); - if ((l1 & ATTR_DESCR_MASK) == L1_INVAL) - goto done; - - 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_INVAL) - goto done; - - 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_INVAL) - goto done; - - 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)) + if (lvl != 3) + val |= MINCORE_SUPER; + if (pmap_page_dirty(tpte)) val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER; - if ((l3 & ATTR_AF) == ATTR_AF) + if ((tpte & ATTR_AF) == ATTR_AF) val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER; - } -done: + managed = (tpte & ATTR_SW_MANAGED) == ATTR_SW_MANAGED; + pa = (tpte & ~ATTR_MASK) | (addr & mask); + } else + managed = false; + 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. */ _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
