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 */
_______________________________________________
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"
