[ramdisk] add cvitek pre-built ramdisk

Change-Id: Ic7d2046a23358129eaf621b5558984a64fa7361d

ramdisk/initramfs/glibc_riscv64/usr/include/ucontext.h

@@ -0,0 +1,56 @@
+/* Copyright (C) 1997-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* System V ABI compliant user-level context switching support.  */
+
+#ifndef _UCONTEXT_H
+#define _UCONTEXT_H	1
+
+#include <features.h>
+
+/* Get definition of __INDIRECT_RETURN.  */
+#include <bits/indirect-return.h>
+
+/* Get machine dependent definition of data structures.  */
+#include <sys/ucontext.h>
+
+__BEGIN_DECLS
+
+/* Get user context and store it in variable pointed to by UCP.  */
+extern int getcontext (ucontext_t *__ucp) __THROWNL;
+
+/* Set user context from information of variable pointed to by UCP.  */
+extern int setcontext (const ucontext_t *__ucp) __THROWNL;
+
+/* Save current context in context variable pointed to by OUCP and set
+   context from variable pointed to by UCP.  */
+extern int swapcontext (ucontext_t *__restrict __oucp,
+			const ucontext_t *__restrict __ucp)
+  __THROWNL __INDIRECT_RETURN;
+
+/* Manipulate user context UCP to continue with calling functions FUNC
+   and the ARGC-1 parameters following ARGC when the context is used
+   the next time in `setcontext' or `swapcontext'.
+
+   We cannot say anything about the parameters FUNC takes; `void'
+   is as good as any other choice.  */
+extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
+			 int __argc, ...) __THROW;
+
+__END_DECLS
+
+#endif /* ucontext.h */