Merge remote-tracking branch 'cisco/for-next'

1 files changed, 72 insertions, 0 deletions

diff --git a/include/linux/cmdline.h b/include/linux/cmdline.h
new file mode 100644
index 000000000000..126fa52f55d2
--- /dev/null
+++ b/include/linux/cmdline.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_CMDLINE_H
+#define _LINUX_CMDLINE_H
+
+/*
+ *
+ * Copyright (C) 2015. Cisco Systems, Inc.
+ *
+ * Generic Append/Prepend cmdline support.
+ */
+
+#if defined(CONFIG_GENERIC_CMDLINE) && defined(CONFIG_CMDLINE_BOOL)
+
+#ifndef CONFIG_CMDLINE_OVERRIDE
+/*
+ * This function will append or prepend a builtin command line to the command
+ * line provided by the bootloader. Kconfig options can be used to alter
+ * the behavior of this builtin command line.
+ * @dest: The destination of the final appended/prepended string
+ * @src: The starting string or NULL if there isn't one.
+ * @tmp: temporary space used for prepending
+ * @length: the maximum length of the strings above.
+ */
+static inline void
+_cmdline_add_builtin(char *dest, char *src, char *tmp, unsigned long length)
+{
+	if (src != dest && src != NULL) {
+		strlcpy(dest, " ", length);
+		strlcat(dest, src, length);
+	}
+
+	strlcat(dest, " ", length);
+
+	if (sizeof(CONFIG_CMDLINE_APPEND) > 1)
+		strlcat(dest, CONFIG_CMDLINE_APPEND, length);
+
+	if (sizeof(CONFIG_CMDLINE_PREPEND) > 1) {
+		strlcpy(tmp, CONFIG_CMDLINE_PREPEND, length);
+		strlcat(tmp, " ", length);
+		strlcat(tmp, dest, length);
+		strlcpy(dest, tmp, length);
+	}
+}
+
+#define cmdline_add_builtin_section(dest, src, length, section) 	    \
+{									    \
+	if (sizeof(CONFIG_CMDLINE_PREPEND) > 1) {			    \
+		static char cmdline_tmp_space[length] section;	            \
+		_cmdline_add_builtin(dest, src, cmdline_tmp_space, length); \
+	} else {							    \
+		_cmdline_add_builtin(dest, src, NULL, length);		    \
+	}								    \
+}
+#else
+#define cmdline_add_builtin_section(dest, src, length, section) 	   \
+{									   \
+	strlcpy(dest, CONFIG_CMDLINE_PREPEND " " CONFIG_CMDLINE_APPEND,    \
+		length);						   \
+}
+#endif /* !CONFIG_CMDLINE_OVERRIDE */
+
+#else
+#define cmdline_add_builtin_section(dest, src, length, section) {          \
+	if (src != NULL)						   \
+		strlcpy(dest, src, length);				   \
+}
+#endif /* CONFIG_GENERIC_CMDLINE */
+
+#define cmdline_add_builtin(dest, src, length) \
+	cmdline_add_builtin_section(dest, src, length, __initdata)
+
+#endif /* _LINUX_CMDLINE_H */