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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/parisc/lib/memcpy.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/parisc/lib/memcpy.c')
-rw-r--r--arch/parisc/lib/memcpy.c57
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;
+}