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-rw-r--r--sys/i386/i386/pmap.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index 25a8ab8..f812245 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -292,6 +292,13 @@ CTASSERT(1 << PDESHIFT == sizeof(pd_entry_t));
CTASSERT(1 << PTESHIFT == sizeof(pt_entry_t));
/*
+ * If you get an error here, then you set KVA_PAGES wrong! See the
+ * description of KVA_PAGES in sys/i386/include/pmap.h. It must be
+ * multiple of 4 for a normal kernel, or a multiple of 8 for a PAE.
+ */
+CTASSERT(KERNBASE % (1 << 24) == 0);
+
+/*
* Move the kernel virtual free pointer to the next
* 4MB. This is used to help improve performance
* by using a large (4MB) page for much of the kernel
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