Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (C) 2011 Texas Instruments Incorporated
3 * Author: Mark Salter <msalter@redhat.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9#ifndef _ASM_C6X_UACCESS_H
10#define _ASM_C6X_UACCESS_H
11
12#include <linux/types.h>
13#include <linux/compiler.h>
14#include <linux/string.h>
15
16/*
17 * C6X supports unaligned 32 and 64 bit loads and stores.
18 */
19static inline __must_check unsigned long
20raw_copy_from_user(void *to, const void __user *from, unsigned long n)
21{
22 u32 tmp32;
23 u64 tmp64;
24
25 if (__builtin_constant_p(n)) {
26 switch (n) {
27 case 1:
28 *(u8 *)to = *(u8 __force *)from;
29 return 0;
30 case 4:
31 asm volatile ("ldnw .d1t1 *%2,%0\n"
32 "nop 4\n"
33 "stnw .d1t1 %0,*%1\n"
34 : "=&a"(tmp32)
35 : "A"(to), "a"(from)
36 : "memory");
37 return 0;
38 case 8:
39 asm volatile ("ldndw .d1t1 *%2,%0\n"
40 "nop 4\n"
41 "stndw .d1t1 %0,*%1\n"
42 : "=&a"(tmp64)
43 : "a"(to), "a"(from)
44 : "memory");
45 return 0;
46 default:
47 break;
48 }
49 }
50
51 memcpy(to, (const void __force *)from, n);
52 return 0;
53}
54
55static inline __must_check unsigned long
56raw_copy_to_user(void __user *to, const void *from, unsigned long n)
57{
58 u32 tmp32;
59 u64 tmp64;
60
61 if (__builtin_constant_p(n)) {
62 switch (n) {
63 case 1:
64 *(u8 __force *)to = *(u8 *)from;
65 return 0;
66 case 4:
67 asm volatile ("ldnw .d1t1 *%2,%0\n"
68 "nop 4\n"
69 "stnw .d1t1 %0,*%1\n"
70 : "=&a"(tmp32)
71 : "a"(to), "a"(from)
72 : "memory");
73 return 0;
74 case 8:
75 asm volatile ("ldndw .d1t1 *%2,%0\n"
76 "nop 4\n"
77 "stndw .d1t1 %0,*%1\n"
78 : "=&a"(tmp64)
79 : "a"(to), "a"(from)
80 : "memory");
81 return 0;
82 default:
83 break;
84 }
85 }
86
87 memcpy((void __force *)to, from, n);
88 return 0;
89}
90#define INLINE_COPY_FROM_USER
91#define INLINE_COPY_TO_USER
92
93extern int _access_ok(unsigned long addr, unsigned long size);
94#ifdef CONFIG_ACCESS_CHECK
95#define __access_ok _access_ok
96#endif
97
98#include <asm-generic/uaccess.h>
99
100#endif /* _ASM_C6X_UACCESS_H */