Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c
new file mode 100644
index 000000000..5fc0c852c
--- /dev/null
+++ b/arch/parisc/lib/memcpy.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *    Optimized memory copy routines.
+ *
+ *    Copyright (C) 2004 Randolph Chung <tausq@debian.org>
+ *    Copyright (C) 2013-2017 Helge Deller <deller@gmx.de>
+ *
+ *    Portions derived from the GNU C Library
+ *    Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/compiler.h>
+#include <linux/uaccess.h>
+
+#define get_user_space()	mfsp(SR_USER)
+#define get_kernel_space()	SR_KERNEL
+
+/* Returns 0 for success, otherwise, returns number of bytes not transferred. */
+extern unsigned long pa_memcpy(void *dst, const void *src,
+				unsigned long len);
+
+unsigned long raw_copy_to_user(void __user *dst, const void *src,
+			       unsigned long len)
+{
+	mtsp(get_kernel_space(), SR_TEMP1);
+	mtsp(get_user_space(), SR_TEMP2);
+	return pa_memcpy((void __force *)dst, src, len);
+}
+EXPORT_SYMBOL(raw_copy_to_user);
+
+unsigned long raw_copy_from_user(void *dst, const void __user *src,
+			       unsigned long len)
+{
+	mtsp(get_user_space(), SR_TEMP1);
+	mtsp(get_kernel_space(), SR_TEMP2);
+	return pa_memcpy(dst, (void __force *)src, len);
+}
+EXPORT_SYMBOL(raw_copy_from_user);
+
+void * memcpy(void * dst,const void *src, size_t count)
+{
+	mtsp(get_kernel_space(), SR_TEMP1);
+	mtsp(get_kernel_space(), SR_TEMP2);
+	pa_memcpy(dst, src, count);
+	return dst;
+}
+
+EXPORT_SYMBOL(memcpy);
+
+bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
+{
+	if ((unsigned long)unsafe_src < PAGE_SIZE)
+		return false;
+	/* check for I/O space F_EXTEND(0xfff00000) access as well? */
+	return true;
+}