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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/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2011 Texas Instruments Incorporated
4 * Author: Mark Salter <msalter@redhat.com>
5 */
6#ifndef _ASM_C6X_UACCESS_H
7#define _ASM_C6X_UACCESS_H
8
9#include <linux/types.h>
10#include <linux/compiler.h>
11#include <linux/string.h>
12
13/*
14 * C6X supports unaligned 32 and 64 bit loads and stores.
15 */
16static inline __must_check unsigned long
17raw_copy_from_user(void *to, const void __user *from, unsigned long n)
18{
19 u32 tmp32;
20 u64 tmp64;
21
22 if (__builtin_constant_p(n)) {
23 switch (n) {
24 case 1:
25 *(u8 *)to = *(u8 __force *)from;
26 return 0;
27 case 4:
28 asm volatile ("ldnw .d1t1 *%2,%0\n"
29 "nop 4\n"
30 "stnw .d1t1 %0,*%1\n"
31 : "=&a"(tmp32)
32 : "A"(to), "a"(from)
33 : "memory");
34 return 0;
35 case 8:
36 asm volatile ("ldndw .d1t1 *%2,%0\n"
37 "nop 4\n"
38 "stndw .d1t1 %0,*%1\n"
39 : "=&a"(tmp64)
40 : "a"(to), "a"(from)
41 : "memory");
42 return 0;
43 default:
44 break;
45 }
46 }
47
48 memcpy(to, (const void __force *)from, n);
49 return 0;
50}
51
52static inline __must_check unsigned long
53raw_copy_to_user(void __user *to, const void *from, unsigned long n)
54{
55 u32 tmp32;
56 u64 tmp64;
57
58 if (__builtin_constant_p(n)) {
59 switch (n) {
60 case 1:
61 *(u8 __force *)to = *(u8 *)from;
62 return 0;
63 case 4:
64 asm volatile ("ldnw .d1t1 *%2,%0\n"
65 "nop 4\n"
66 "stnw .d1t1 %0,*%1\n"
67 : "=&a"(tmp32)
68 : "a"(to), "a"(from)
69 : "memory");
70 return 0;
71 case 8:
72 asm volatile ("ldndw .d1t1 *%2,%0\n"
73 "nop 4\n"
74 "stndw .d1t1 %0,*%1\n"
75 : "=&a"(tmp64)
76 : "a"(to), "a"(from)
77 : "memory");
78 return 0;
79 default:
80 break;
81 }
82 }
83
84 memcpy((void __force *)to, from, n);
85 return 0;
86}
87#define INLINE_COPY_FROM_USER
88#define INLINE_COPY_TO_USER
89
90extern int _access_ok(unsigned long addr, unsigned long size);
91#ifdef CONFIG_ACCESS_CHECK
92#define __access_ok _access_ok
93#endif
94
95#include <asm-generic/uaccess.h>
96
97#endif /* _ASM_C6X_UACCESS_H */