1 files changed, 63 insertions, 0 deletions
diff --git a/arch/sparc/prom/bootstr_32.c b/arch/sparc/prom/bootstr_32.c
new file mode 100644
index 0000000000..1c7cd258b0
--- /dev/null
+++ b/arch/sparc/prom/bootstr_32.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * bootstr.c:  Boot string/argument acquisition from the PROM.
+ *
+ * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/string.h>
+#include <asm/oplib.h>
+#include <linux/init.h>
+
+#define BARG_LEN  256
+static char barg_buf[BARG_LEN] = { 0 };
+static char fetched __initdata = 0;
+
+char * __init
+prom_getbootargs(void)
+{
+	int iter;
+	char *cp, *arg;
+
+	/* This check saves us from a panic when bootfd patches args. */
+	if (fetched) {
+		return barg_buf;
+	}
+
+	switch (prom_vers) {
+	case PROM_V0:
+		cp = barg_buf;
+		/* Start from 1 and go over fd(0,0,0)kernel */
+		for (iter = 1; iter < 8; iter++) {
+			arg = (*(romvec->pv_v0bootargs))->argv[iter];
+			if (arg == NULL)
+				break;
+			while (*arg != 0) {
+				/* Leave place for space and null. */
+				if (cp >= barg_buf + BARG_LEN - 2)
+					/* We might issue a warning here. */
+					break;
+				*cp++ = *arg++;
+			}
+			*cp++ = ' ';
+			if (cp >= barg_buf + BARG_LEN - 1)
+				/* We might issue a warning here. */
+				break;
+		}
+		*cp = 0;
+		break;
+	case PROM_V2:
+	case PROM_V3:
+		/*
+		 * V3 PROM cannot supply as with more than 128 bytes
+		 * of an argument. But a smart bootstrap loader can.
+		 */
+		strscpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf));
+		break;
+	default:
+		break;
+	}
+
+	fetched = 1;
+	return barg_buf;
+}