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 */
16 static inline __must_check unsigned long
raw_copy_from_user(void * to,const void __user * from,unsigned long n)17 raw_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
52 static inline __must_check unsigned long
raw_copy_to_user(void __user * to,const void * from,unsigned long n)53 raw_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
90 extern 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 */
98