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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#ifdef CONFIG_ACCESS_CHECK
17#define __access_ok _access_ok
18#endif
19
20/*
21 * __copy_from_user/copy_to_user are based on ones in asm-generic/uaccess.h
22 *
23 * C6X supports unaligned 32 and 64 bit loads and stores.
24 */
25static inline __must_check long __copy_from_user(void *to,
26 const void __user *from, unsigned long n)
27{
28 u32 tmp32;
29 u64 tmp64;
30
31 if (__builtin_constant_p(n)) {
32 switch (n) {
33 case 1:
34 *(u8 *)to = *(u8 __force *)from;
35 return 0;
36 case 4:
37 asm volatile ("ldnw .d1t1 *%2,%0\n"
38 "nop 4\n"
39 "stnw .d1t1 %0,*%1\n"
40 : "=&a"(tmp32)
41 : "A"(to), "a"(from)
42 : "memory");
43 return 0;
44 case 8:
45 asm volatile ("ldndw .d1t1 *%2,%0\n"
46 "nop 4\n"
47 "stndw .d1t1 %0,*%1\n"
48 : "=&a"(tmp64)
49 : "a"(to), "a"(from)
50 : "memory");
51 return 0;
52 default:
53 break;
54 }
55 }
56
57 memcpy(to, (const void __force *)from, n);
58 return 0;
59}
60
61static inline __must_check long __copy_to_user(void __user *to,
62 const void *from, unsigned long n)
63{
64 u32 tmp32;
65 u64 tmp64;
66
67 if (__builtin_constant_p(n)) {
68 switch (n) {
69 case 1:
70 *(u8 __force *)to = *(u8 *)from;
71 return 0;
72 case 4:
73 asm volatile ("ldnw .d1t1 *%2,%0\n"
74 "nop 4\n"
75 "stnw .d1t1 %0,*%1\n"
76 : "=&a"(tmp32)
77 : "a"(to), "a"(from)
78 : "memory");
79 return 0;
80 case 8:
81 asm volatile ("ldndw .d1t1 *%2,%0\n"
82 "nop 4\n"
83 "stndw .d1t1 %0,*%1\n"
84 : "=&a"(tmp64)
85 : "a"(to), "a"(from)
86 : "memory");
87 return 0;
88 default:
89 break;
90 }
91 }
92
93 memcpy((void __force *)to, from, n);
94 return 0;
95}
96
97#define __copy_to_user __copy_to_user
98#define __copy_from_user __copy_from_user
99
100extern int _access_ok(unsigned long addr, unsigned long size);
101#ifdef CONFIG_ACCESS_CHECK
102#define __access_ok _access_ok
103#endif
104
105#include <asm-generic/uaccess.h>
106
107#endif /* _ASM_C6X_UACCESS_H */
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 */