Date: Thu, 20 Aug 2015 12:05:43 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r286956 - in head/sys/arm64: arm64 include Message-ID: <201508201205.t7KC5hVE012728@repo.freebsd.org>
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Author: andrew Date: Thu Aug 20 12:05:42 2015 New Revision: 286956 URL: https://svnweb.freebsd.org/changeset/base/286956 Log: Add pmap_get_tables to get the page tables for a given virtual address. This will be used for minidump support. Obtained from: ABT Systems Ltd Sponsored by: The FreeBSD Foundation Modified: head/sys/arm64/arm64/pmap.c head/sys/arm64/include/pmap.h Modified: head/sys/arm64/arm64/pmap.c ============================================================================== --- head/sys/arm64/arm64/pmap.c Thu Aug 20 12:05:17 2015 (r286955) +++ head/sys/arm64/arm64/pmap.c Thu Aug 20 12:05:42 2015 (r286956) @@ -314,6 +314,40 @@ pmap_l3(pmap_t pmap, vm_offset_t va) return (pmap_l2_to_l3(l2, va)); } +bool +pmap_get_tables(pmap_t pmap, vm_offset_t va, pd_entry_t **l1, pd_entry_t **l2, + pt_entry_t **l3) +{ + pd_entry_t *l1p, *l2p; + + if (pmap->pm_l1 == NULL) + return (false); + + l1p = pmap_l1(pmap, va); + *l1 = l1p; + + if ((*l1p & ATTR_DESCR_MASK) == L1_BLOCK) { + *l2 = NULL; + *l3 = NULL; + return (true); + } + + if ((*l1p & ATTR_DESCR_MASK) != L1_TABLE) + return (false); + + l2p = pmap_l1_to_l2(l1p, va); + *l2 = l2p; + + if ((*l2p & ATTR_DESCR_MASK) == L2_BLOCK) { + *l3 = NULL; + return (true); + } + + *l3 = pmap_l2_to_l3(l2p, va); + + return (true); +} + /* * These load the old table data and store the new value. * They need to be atomic as the System MMU may write to the table at Modified: head/sys/arm64/include/pmap.h ============================================================================== --- head/sys/arm64/include/pmap.h Thu Aug 20 12:05:17 2015 (r286955) +++ head/sys/arm64/include/pmap.h Thu Aug 20 12:05:42 2015 (r286956) @@ -149,6 +149,9 @@ void pmap_unmapbios(vm_offset_t, vm_size boolean_t pmap_map_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t); void pmap_unmap_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t); +bool pmap_get_tables(pmap_t, vm_offset_t, pd_entry_t **, pd_entry_t **, + pt_entry_t **); + #define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list)) #endif /* _KERNEL */
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