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 */
108