Add a low level function to write a string to the hypervisor

console directly.

Discussed with: kmacy

2 files changed, 17 insertions, 0 deletions

diff --git a/sys/sun4v/include/hypervisor_api.h b/sys/sun4v/include/hypervisor_api.h
index b760941..f24a468 100644
--- a/sys/sun4v/include/hypervisor_api.h
+++ b/sys/sun4v/include/hypervisor_api.h
@@ -116,6 +116,7 @@ extern uint64_t hv_dump_buf_update(uint64_t, uint64_t, uint64_t *);
 
 extern int64_t hv_cnputchar(uint8_t);
 extern int64_t hv_cngetchar(uint8_t *);
+extern void hv_cnputs(char *);
 
 extern uint64_t hv_tod_get(uint64_t *seconds);
 extern uint64_t hv_tod_set(uint64_t);
diff --git a/sys/sun4v/sun4v/hvcons.c b/sys/sun4v/sun4v/hvcons.c
index 359b0be..2740b84 100644
--- a/sys/sun4v/sun4v/hvcons.c
+++ b/sys/sun4v/sun4v/hvcons.c
@@ -93,6 +93,22 @@ static cn_term_t	hvcn_cnterm;
 
 CONSOLE_DRIVER(hvcn);
 
+void
+hv_cnputs(char *p)
+{
+	int c, error;
+
+	while ((c = *p++) != '\0') {
+		if (c == '\n') {
+			do {
+				error = hv_cnputchar('\r');
+			} while (error == H_EWOULDBLOCK);
+		}
+		do {
+			error = hv_cnputchar(c);
+		} while (error == H_EWOULDBLOCK);
+	}
+}
 
 static int
 hvcn_open(struct cdev *dev, int flag, int mode, struct thread *td)