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$NetBSD: patch-util.c,v 1.1 2022/11/28 04:26:08 mrg Exp $
* Use /dev/smbios instead of /dev/mem on NetBSD if available.
--- util.c.orig 2022-06-27 08:06:32.000000000 -0700
+++ util.c 2022-11-27 14:28:45.657997798 -0800
@@ -36,6 +36,9 @@
#define MAP_FAILED ((void *) -1)
#endif /* !MAP_FAILED */
#endif /* USE MMAP */
+#ifdef __NetBSD__
+#include <sys/sysctl.h>
+#endif
#include <stdio.h>
#include <stdlib.h>
@@ -314,3 +317,28 @@
return res;
}
+
+#ifdef USE_DEFAULT_MEM_DEV_FUNC
+const char *
+default_mem_dev(void)
+{
+#ifdef __NetBSD__
+ uint64_t addr;
+ size_t addrlen = sizeof addr;
+ int ret;
+
+ /*
+ * If machdep.smbios exists and has a non-zero value, /dev/smbios
+ * should work. Otherwise fallback to /dev/mem.
+ */
+ ret = sysctlbyname("machdep.smbios", &addr, &addrlen, NULL, 0);
+ if (ret == 0 && addr != 0) {
+ return "/dev/smbios";
+ } else {
+ return "/dev/mem";
+ }
+#else
+# error "not implemented."
+#endif
+}
+#endif
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