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9#ifndef __BLACKFIN_UACCESS_H
10#define __BLACKFIN_UACCESS_H
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15#include <linux/sched.h>
16#include <linux/mm.h>
17#include <linux/string.h>
18
19#include <asm/segment.h>
20#include <asm/sections.h>
21
22#define get_ds() (KERNEL_DS)
23#define get_fs() (current_thread_info()->addr_limit)
24
25static inline void set_fs(mm_segment_t fs)
26{
27 current_thread_info()->addr_limit = fs;
28}
29
30#define segment_eq(a,b) ((a) == (b))
31
32#define VERIFY_READ 0
33#define VERIFY_WRITE 1
34
35#define access_ok(type, addr, size) _access_ok((unsigned long)(addr), (size))
36
37static inline int is_in_rom(unsigned long addr)
38{
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46
47 if ((addr < _ramstart) || (addr >= _ramend))
48 return (1);
49
50
51 return (0);
52}
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59
60#ifndef CONFIG_ACCESS_CHECK
61static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; }
62#else
63extern int _access_ok(unsigned long addr, unsigned long size);
64#endif
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78
79struct exception_table_entry {
80 unsigned long insn, fixup;
81};
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86
87
88#define put_user(x,p) \
89 ({ \
90 int _err = 0; \
91 typeof(*(p)) _x = (x); \
92 typeof(*(p)) *_p = (p); \
93 if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\
94 _err = -EFAULT; \
95 } \
96 else { \
97 switch (sizeof (*(_p))) { \
98 case 1: \
99 __put_user_asm(_x, _p, B); \
100 break; \
101 case 2: \
102 __put_user_asm(_x, _p, W); \
103 break; \
104 case 4: \
105 __put_user_asm(_x, _p, ); \
106 break; \
107 case 8: { \
108 long _xl, _xh; \
109 _xl = ((long *)&_x)[0]; \
110 _xh = ((long *)&_x)[1]; \
111 __put_user_asm(_xl, ((long *)_p)+0, ); \
112 __put_user_asm(_xh, ((long *)_p)+1, ); \
113 } break; \
114 default: \
115 _err = __put_user_bad(); \
116 break; \
117 } \
118 } \
119 _err; \
120 })
121
122#define __put_user(x,p) put_user(x,p)
123static inline int bad_user_access_length(void)
124{
125 panic("bad_user_access_length");
126 return -1;
127}
128
129#define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\
130 __FILE__, __LINE__, __func__),\
131 bad_user_access_length(), (-EFAULT))
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138
139#define __ptr(x) ((unsigned long *)(x))
140
141#define __put_user_asm(x,p,bhw) \
142 __asm__ (#bhw"[%1] = %0;\n\t" \
143 : \
144 :"d" (x),"a" (__ptr(p)) : "memory")
145
146#define get_user(x, ptr) \
147({ \
148 int _err = 0; \
149 unsigned long _val = 0; \
150 const typeof(*(ptr)) __user *_p = (ptr); \
151 const size_t ptr_size = sizeof(*(_p)); \
152 if (likely(access_ok(VERIFY_READ, _p, ptr_size))) { \
153 BUILD_BUG_ON(ptr_size >= 8); \
154 switch (ptr_size) { \
155 case 1: \
156 __get_user_asm(_val, _p, B,(Z)); \
157 break; \
158 case 2: \
159 __get_user_asm(_val, _p, W,(Z)); \
160 break; \
161 case 4: \
162 __get_user_asm(_val, _p, , ); \
163 break; \
164 } \
165 } else \
166 _err = -EFAULT; \
167 x = (typeof(*(ptr)))_val; \
168 _err; \
169})
170
171#define __get_user(x,p) get_user(x,p)
172
173#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
174
175#define __get_user_asm(x, ptr, bhw, option) \
176({ \
177 __asm__ __volatile__ ( \
178 "%0 =" #bhw "[%1]" #option ";" \
179 : "=d" (x) \
180 : "a" (__ptr(ptr))); \
181})
182
183#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
184#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
185#define __copy_to_user_inatomic __copy_to_user
186#define __copy_from_user_inatomic __copy_from_user
187
188#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n))\
189 return retval; })
190
191#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n))\
192 return retval; })
193
194static inline unsigned long __must_check
195copy_from_user(void *to, const void __user *from, unsigned long n)
196{
197 if (access_ok(VERIFY_READ, from, n))
198 memcpy(to, from, n);
199 else
200 return n;
201 return 0;
202}
203
204static inline unsigned long __must_check
205copy_to_user(void *to, const void __user *from, unsigned long n)
206{
207 if (access_ok(VERIFY_WRITE, to, n))
208 memcpy(to, from, n);
209 else
210 return n;
211 return 0;
212}
213
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217
218static inline long __must_check
219strncpy_from_user(char *dst, const char *src, long count)
220{
221 char *tmp;
222 if (!access_ok(VERIFY_READ, src, 1))
223 return -EFAULT;
224 strncpy(dst, src, count);
225 for (tmp = dst; *tmp && count > 0; tmp++, count--) ;
226 return (tmp - dst);
227}
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239
240static inline long __must_check strnlen_user(const char *src, long n)
241{
242 if (!access_ok(VERIFY_READ, src, 1))
243 return 0;
244 return strnlen(src, n) + 1;
245}
246
247static inline long __must_check strlen_user(const char *src)
248{
249 if (!access_ok(VERIFY_READ, src, 1))
250 return 0;
251 return strlen(src) + 1;
252}
253
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257
258static inline unsigned long __must_check
259__clear_user(void *to, unsigned long n)
260{
261 if (!access_ok(VERIFY_WRITE, to, n))
262 return n;
263 memset(to, 0, n);
264 return 0;
265}
266
267#define clear_user(to, n) __clear_user(to, n)
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275
276enum {
277 BFIN_MEM_ACCESS_CORE = 0,
278 BFIN_MEM_ACCESS_CORE_ONLY,
279 BFIN_MEM_ACCESS_DMA,
280 BFIN_MEM_ACCESS_IDMA,
281 BFIN_MEM_ACCESS_ITEST,
282};
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289int bfin_mem_access_type(unsigned long addr, unsigned long size);
290
291#endif
292