1 files changed, 50 insertions, 0 deletions
diff --git a/sys/arch/i386/stand/libsa/memprobe.c b/sys/arch/i386/stand/libsa/memprobe.c
new file mode 100644
index 00000000000..1a67eafb84d
--- /dev/null
+++ b/sys/arch/i386/stand/libsa/memprobe.c
@@ -0,0 +1,50 @@
+/* $OpenBSD: memprobe.c,v 1.1 1997/03/31 03:12:14 weingart Exp $ */
+
+#include <sys/param.h>
+#include <libsa.h>
+
+
+/* addrprobe(kloc): Probe memory at address kloc * 1024.
+ *
+ * This is a hack, but it seems to work ok.  Maybe this is
+ * the *real* way that you are supposed to do probing???
+ */
+static int addrprobe(int kloc){
+	volatile int *loc, i;
+	static int pat[] = {
+		0x00000000, 0xFFFFFFFF,
+		0x01010101, 0x10101010,
+		0x55555555, 0xCCCCCCCC
+	};
+
+	/* Get location */
+	loc = (int *)(kloc * 1024);
+
+	/* Probe address */
+	for(i = 0; i < sizeof(pat)/sizeof(pat[0]); i++){
+		*loc = pat[i];
+		if(*loc != pat[i]) return(1);
+	}
+
+	return(0);
+}
+
+
+/* memprobe():  return probed memory size in KB for extended memory
+ *
+ * There is no need to do this in assembly language.  This are
+ * much easier to debug in C anyways.
+ */
+int memprobe(void){
+	int ram;
+
+	for(ram = 1024; ram < 512*1024; ram += 4){
+
+		printf("Probing memory: %d KB\r", ram-1024);
+		if(addrprobe(ram)) break;
+	}
+
+	printf("\n");
+	return(ram-1024);
+}
+