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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 /*
 17  * C6X supports unaligned 32 and 64 bit loads and stores.
 18  */
 19 static inline __must_check unsigned long
 20 raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 21 {
 22         u32 tmp32;
 23         u64 tmp64;
 24 
 25         if (__builtin_constant_p(n)) {
 26                 switch (n) {
 27                 case 1:
 28                         *(u8 *)to = *(u8 __force *)from;
 29                         return 0;
 30                 case 4:
 31                         asm volatile ("ldnw .d1t1 *%2,%0\n"
 32                                       "nop  4\n"
 33                                       "stnw .d1t1 %0,*%1\n"
 34                                       : "=&a"(tmp32)
 35                                       : "A"(to), "a"(from)
 36                                       : "memory");
 37                         return 0;
 38                 case 8:
 39                         asm volatile ("ldndw .d1t1 *%2,%0\n"
 40                                       "nop   4\n"
 41                                       "stndw .d1t1 %0,*%1\n"
 42                                       : "=&a"(tmp64)
 43                                       : "a"(to), "a"(from)
 44                                       : "memory");
 45                         return 0;
 46                 default:
 47                         break;
 48                 }
 49         }
 50 
 51         memcpy(to, (const void __force *)from, n);
 52         return 0;
 53 }
 54 
 55 static inline __must_check unsigned long
 56 raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 57 {
 58         u32 tmp32;
 59         u64 tmp64;
 60 
 61         if (__builtin_constant_p(n)) {
 62                 switch (n) {
 63                 case 1:
 64                         *(u8 __force *)to = *(u8 *)from;
 65                         return 0;
 66                 case 4:
 67                         asm volatile ("ldnw .d1t1 *%2,%0\n"
 68                                       "nop  4\n"
 69                                       "stnw .d1t1 %0,*%1\n"
 70                                       : "=&a"(tmp32)
 71                                       : "a"(to), "a"(from)
 72                                       : "memory");
 73                         return 0;
 74                 case 8:
 75                         asm volatile ("ldndw .d1t1 *%2,%0\n"
 76                                       "nop   4\n"
 77                                       "stndw .d1t1 %0,*%1\n"
 78                                       : "=&a"(tmp64)
 79                                       : "a"(to), "a"(from)
 80                                       : "memory");
 81                         return 0;
 82                 default:
 83                         break;
 84                 }
 85         }
 86 
 87         memcpy((void __force *)to, from, n);
 88         return 0;
 89 }
 90 #define INLINE_COPY_FROM_USER
 91 #define INLINE_COPY_TO_USER
 92 
 93 extern int _access_ok(unsigned long addr, unsigned long size);
 94 #ifdef CONFIG_ACCESS_CHECK
 95 #define __access_ok _access_ok
 96 #endif
 97 
 98 #include <asm-generic/uaccess.h>
 99 
100 #endif /* _ASM_C6X_UACCESS_H */
101 

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