| Aurelien Jacquiot | a7f626c | 2011-10-04 11:14:47 -0400 | [diff] [blame] | 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 */ |