From 57825a2d1c737b3b3d548c806ff83edebadf2f1d Mon Sep 17 00:00:00 2001 From: alc Date: Sun, 4 Dec 2011 07:18:54 +0000 Subject: [PATCH] MFC r213897 Update pmap_extract() to handle 1GB page mappings. Some device drivers use pmap_extract() rather than pmap_kextract() on direct map addresses. Thus, pmap_extract() needs to be able to deal with 1GB page mappings if we are to use 1GB page mappings for the direct map. (See r197580.) git-svn-id: svn://svn.freebsd.org/base/stable/8@228255 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/amd64/amd64/pmap.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c index b273a4453..5f5b8e363 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -1141,26 +1141,33 @@ pmap_is_current(pmap_t pmap) vm_paddr_t pmap_extract(pmap_t pmap, vm_offset_t va) { - vm_paddr_t rtval; + pdp_entry_t *pdpe; + pd_entry_t *pde; pt_entry_t *pte; - pd_entry_t pde, *pdep; + vm_paddr_t pa; - rtval = 0; + pa = 0; PMAP_LOCK(pmap); - pdep = pmap_pde(pmap, va); - if (pdep != NULL) { - pde = *pdep; - if (pde) { - if ((pde & PG_PS) != 0) - rtval = (pde & PG_PS_FRAME) | (va & PDRMASK); - else { - pte = pmap_pde_to_pte(pdep, va); - rtval = (*pte & PG_FRAME) | (va & PAGE_MASK); + pdpe = pmap_pdpe(pmap, va); + if (pdpe != NULL && (*pdpe & PG_V) != 0) { + if ((*pdpe & PG_PS) != 0) + pa = (*pdpe & PG_PS_FRAME) | (va & PDPMASK); + else { + pde = pmap_pdpe_to_pde(pdpe, va); + if ((*pde & PG_V) != 0) { + if ((*pde & PG_PS) != 0) { + pa = (*pde & PG_PS_FRAME) | + (va & PDRMASK); + } else { + pte = pmap_pde_to_pte(pde, va); + pa = (*pte & PG_FRAME) | + (va & PAGE_MASK); + } } } } PMAP_UNLOCK(pmap); - return (rtval); + return (pa); } /* -- 2.45.0