1 files changed, 30 insertions, 0 deletions
diff --git a/sys/powerpc/powerpc/machdep.c b/sys/powerpc/powerpc/machdep.c
index ac35d8f..cedcf73 100644
--- a/sys/powerpc/powerpc/machdep.c
+++ b/sys/powerpc/powerpc/machdep.c
@@ -961,3 +961,33 @@ cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz)
 
 	pcpu->pc_current_asngen = 1;
 }
+
+/*
+ * kcopy(const void *src, void *dst, size_t len);
+ *
+ * Copy len bytes from src to dst, aborting if we encounter a fatal
+ * page fault.
+ *
+ * kcopy() _must_ save and restore the old fault handler since it is
+ * called by uiomove(), which may be in the path of servicing a non-fatal
+ * page fault.
+ */
+int
+kcopy(const void *src, void *dst, size_t len)
+{
+	struct thread	*td;
+	faultbuf	env, *oldfault;
+	int		rv;
+
+	td = PCPU_GET(curthread);
+	oldfault = td->td_pcb->pcb_onfault;
+	if ((rv = setfault(env)) != 0) {
+		td->td_pcb->pcb_onfault = oldfault;
+		return rv;
+	}
+
+	memcpy(dst, src, len);
+
+	td->td_pcb->pcb_onfault = oldfault;
+	return (0);
+}