Author: markj Date: Thu Jul 26 16:08:26 2018 New Revision: 336740 URL: https://svnweb.freebsd.org/changeset/base/336740
Log: Implement pmap_mincore() for riscv. Reviewed by: alc, br Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D16444 Modified: head/sys/riscv/riscv/pmap.c Modified: head/sys/riscv/riscv/pmap.c ============================================================================== --- head/sys/riscv/riscv/pmap.c Thu Jul 26 14:42:20 2018 (r336739) +++ head/sys/riscv/riscv/pmap.c Thu Jul 26 16:08:26 2018 (r336740) @@ -389,6 +389,13 @@ pmap_l3_valid_cacheable(pt_entry_t l3) #define PTE_SYNC(pte) cpu_dcache_wb_range((vm_offset_t)pte, sizeof(*pte)) +static inline int +pmap_page_accessed(pt_entry_t pte) +{ + + return (pte & PTE_A); +} + /* Checks if the page is dirty. */ static inline int pmap_page_dirty(pt_entry_t pte) @@ -3176,8 +3183,47 @@ 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) { + pt_entry_t *l2, *l3, tpte; + vm_paddr_t pa; + int val; + bool managed; - panic("RISCVTODO: pmap_mincore"); + PMAP_LOCK(pmap); +retry: + managed = false; + val = 0; + + l2 = pmap_l2(pmap, addr); + if (l2 != NULL && ((tpte = pmap_load(l2)) & PTE_V) != 0) { + if ((tpte & (PTE_R | PTE_W | PTE_X)) != 0) { + pa = PTE_TO_PHYS(tpte) | (addr & L2_OFFSET); + val = MINCORE_INCORE | MINCORE_SUPER; + } else { + l3 = pmap_l2_to_l3(l2, addr); + tpte = pmap_load(l3); + if ((tpte & PTE_V) == 0) + goto done; + pa = PTE_TO_PHYS(tpte) | (addr & L3_OFFSET); + val = MINCORE_INCORE; + } + + if (pmap_page_dirty(tpte)) + val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER; + if (pmap_page_accessed(tpte)) + val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER; + managed = (tpte & PTE_SW_MANAGED) == PTE_SW_MANAGED; + } + +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 _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
