1 files changed, 30 insertions, 3 deletions
diff --git a/sys/boot/ofw/libofw/ofw_copy.c b/sys/boot/ofw/libofw/ofw_copy.c
index ecfb8e6..1ae37c7 100644
--- a/sys/boot/ofw/libofw/ofw_copy.c
+++ b/sys/boot/ofw/libofw/ofw_copy.c
@@ -34,6 +34,8 @@
 
 #include "libofw.h"
 
+#define	READIN_BUF	(4 * 1024)
+
 ssize_t
 ofw_copyin(const void *src, vm_offset_t dest, const size_t len)
 {
@@ -51,7 +53,32 @@ ofw_copyout(const vm_offset_t src, void *dest, const size_t len)
 ssize_t
 ofw_readin(const int fd, vm_offset_t dest, const size_t len)
 {
-    return(read(fd, (void *) dest, len));
-}
+	void		*buf;
+	size_t		resid, chunk, get;
+	ssize_t		got;
+	vm_offset_t	p;
+
+	p = dest;
+
+	chunk = min(READIN_BUF, len);
+	buf = malloc(chunk);
+	if (buf == NULL) {
+		printf("ofw_readin: buf malloc failed\n");
+		return(0);
+	}
 
-    
+	for (resid = len; resid > 0; resid -= got, p += got) {
+		get = min(chunk, resid);
+		got = read(fd, buf, get);
+
+		if (got <= 0) {
+			printf("ofw_readin: read failed\n");
+			break;
+		}
+
+		bcopy(buf, (void *)p, got);
+	}
+
+	free(buf);
+	return(len - resid);
+}