patch-1.3.4 linux/arch/sparc/prom/console.c

• Lines: 74
• Date: Sat Jun 17 10:46:22 1995
• Orig file: v1.3.3/linux/arch/sparc/prom/console.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.3/linux/arch/sparc/prom/console.c linux/arch/sparc/prom/console.c
@@ -0,0 +1,73 @@
+/* console.c: Routines that deal with sending and receiving IO
+ *            to/from the current console device using the PROM.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+
+/* Non blocking get character from console input device, returns -1
+ * if no input was taken.  This can be used for polling.
+ */
+int
+prom_nbgetchar(void)
+{
+	static char inc;
+
+	switch(prom_vers) {
+	case PROM_V0:
+		return (*(romvec->pv_nbgetchar))();
+		break;
+	case PROM_V2:
+	case PROM_V3:
+	case PROM_P1275:
+		if( (*(romvec->pv_v2devops).v2_dev_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1)
+			return inc;
+		return -1;
+		break;
+	};
+	return 0; /* Ugh, we could spin forever on unsupported proms ;( */
+}
+
+/* Non blocking put character to console device, returns -1 if
+ * unsuccessful.
+ */
+int
+prom_nbputchar(char c)
+{
+	static char outc;
+
+	switch(prom_vers) {
+	case PROM_V0:
+		return (*(romvec->pv_nbputchar))(c);
+		break;
+	case PROM_V2:
+	case PROM_V3:
+	case PROM_P1275:
+		outc = c;
+		if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1)
+			return 0;
+		return -1;
+		break;
+	};
+	return 0; /* Ugh, we could spin forever on unsupported proms ;( */
+}
+
+/* Blocking version of get character routine above. */
+char
+prom_getchar(void)
+{
+	int character;
+	while((character = prom_nbgetchar()) == -1) ;
+	return (char) character;
+}
+
+/* Blocking version of put character routine above. */
+void
+prom_putchar(char c)
+{
+	while(prom_nbputchar(c) == -1) ;
+	return;
+}
+