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Linux/arch/c6x/include/asm/uaccess.h

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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  */
 25 static 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 
 61 static 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 
100 extern 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 

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