Do not ever try to coredump adapter memory regions.

PR:		4486
Submitted by:	tegge@idi.ntnu.no (Tor Egge)

Implement a function is_adapter_memory() in order to determine what
should nto be dumped at all.  Currently, only populated with the ``ISA
memory hole''.  Adapter regions of other busses should be added.

2 files changed, 31 insertions, 2 deletions

diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c
index 7c93b00..dcb2a9a 100644
--- a/sys/amd64/amd64/vm_machdep.c
+++ b/sys/amd64/amd64/vm_machdep.c
@@ -38,7 +38,7 @@
  *
  *	from: @(#)vm_machdep.c	7.3 (Berkeley) 5/13/91
  *	Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
- *	$Id: vm_machdep.c,v 1.86 1997/08/26 18:10:34 peter Exp $
+ *	$Id: vm_machdep.c,v 1.87 1997/09/02 20:05:31 bde Exp $
  */
 
 #include "npx.h"
@@ -957,3 +957,31 @@ vm_page_zero_idle()
 #endif
 	return (1);
 }
+
+/*
+ * Tell whether this address is in some adapter memory region.
+ * Currently used by the kernel coredump code in order to avoid
+ * dumping the ``ISA memory hole'' which could cause indefinite hangs,
+ * or other unpredictable behaviour.
+ */
+
+#include "isa.h"
+
+int
+is_adapter_memory(addr)
+	vm_offset_t addr;
+{
+
+#if NISA > 0
+	/* The ISA ``memory hole''. */
+	if (addr >= 0xa0000 && addr < 0x100000)
+		return 1;
+#endif
+
+	/*
+	 * stuff other tests for known memory-mapped devices (PCI?)
+	 * here
+	 */
+
+	return 0;
+}
diff --git a/sys/amd64/include/md_var.h b/sys/amd64/include/md_var.h
index b5f6625..086704a 100644
--- a/sys/amd64/include/md_var.h
+++ b/sys/amd64/include/md_var.h
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: md_var.h,v 1.15 1997/06/15 02:02:55 wollman Exp $
+ *	$Id: md_var.h,v 1.16 1997/08/09 00:03:14 dyson Exp $
  */
 
 #ifndef _MACHINE_MD_VAR_H_
@@ -68,6 +68,7 @@ void	doreti_popl_es __P((void)) __asm(__STRING(doreti_popl_es));
 void	doreti_popl_es_fault __P((void)) __asm(__STRING(doreti_popl_es_fault));
 int	fill_regs __P((struct proc *p, struct reg *regs));
 void	fillw __P((int /*u_short*/ pat, void *base, size_t cnt));
+int	is_adapter_memory __P((vm_offset_t addr));
 u_long	kvtop __P((void *addr));
 void	setidt __P((int idx, alias_for_inthand_t *func, int typ, int dpl,
 		    int selec));