diff options
Diffstat (limited to 'include/asm-v850/unaligned.h')
| -rw-r--r-- | include/asm-v850/unaligned.h | 124 |
1 files changed, 8 insertions, 116 deletions
diff --git a/include/asm-v850/unaligned.h b/include/asm-v850/unaligned.h index e30b18653a94..53122b28491e 100644 --- a/include/asm-v850/unaligned.h +++ b/include/asm-v850/unaligned.h | |||
| @@ -1,6 +1,4 @@ | |||
| 1 | /* | 1 | /* |
| 2 | * include/asm-v850/unaligned.h -- Unaligned memory access | ||
| 3 | * | ||
| 4 | * Copyright (C) 2001 NEC Corporation | 2 | * Copyright (C) 2001 NEC Corporation |
| 5 | * Copyright (C) 2001 Miles Bader <miles@gnu.org> | 3 | * Copyright (C) 2001 Miles Bader <miles@gnu.org> |
| 6 | * | 4 | * |
| @@ -8,123 +6,17 @@ | |||
| 8 | * Public License. See the file COPYING in the main directory of this | 6 | * Public License. See the file COPYING in the main directory of this |
| 9 | * archive for more details. | 7 | * archive for more details. |
| 10 | * | 8 | * |
| 11 | * This file is a copy of the arm version, include/asm-arm/unaligned.h | ||
| 12 | * | ||
| 13 | * Note that some v850 chips support unaligned access, but it seems too | 9 | * Note that some v850 chips support unaligned access, but it seems too |
| 14 | * annoying to use. | 10 | * annoying to use. |
| 15 | */ | 11 | */ |
| 12 | #ifndef _ASM_V850_UNALIGNED_H | ||
| 13 | #define _ASM_V850_UNALIGNED_H | ||
| 16 | 14 | ||
| 17 | #ifndef __V850_UNALIGNED_H__ | 15 | #include <linux/unaligned/be_byteshift.h> |
| 18 | #define __V850_UNALIGNED_H__ | 16 | #include <linux/unaligned/le_byteshift.h> |
| 19 | 17 | #include <linux/unaligned/generic.h> | |
| 20 | #include <asm/types.h> | ||
| 21 | |||
| 22 | extern int __bug_unaligned_x(void *ptr); | ||
| 23 | |||
| 24 | /* | ||
| 25 | * What is the most efficient way of loading/storing an unaligned value? | ||
| 26 | * | ||
| 27 | * That is the subject of this file. Efficiency here is defined as | ||
| 28 | * minimum code size with minimum register usage for the common cases. | ||
| 29 | * It is currently not believed that long longs are common, so we | ||
| 30 | * trade efficiency for the chars, shorts and longs against the long | ||
| 31 | * longs. | ||
| 32 | * | ||
| 33 | * Current stats with gcc 2.7.2.2 for these functions: | ||
| 34 | * | ||
| 35 | * ptrsize get: code regs put: code regs | ||
| 36 | * 1 1 1 1 2 | ||
| 37 | * 2 3 2 3 2 | ||
| 38 | * 4 7 3 7 3 | ||
| 39 | * 8 20 6 16 6 | ||
| 40 | * | ||
| 41 | * gcc 2.95.1 seems to code differently: | ||
| 42 | * | ||
| 43 | * ptrsize get: code regs put: code regs | ||
| 44 | * 1 1 1 1 2 | ||
| 45 | * 2 3 2 3 2 | ||
| 46 | * 4 7 4 7 4 | ||
| 47 | * 8 19 8 15 6 | ||
| 48 | * | ||
| 49 | * which may or may not be more efficient (depending upon whether | ||
| 50 | * you can afford the extra registers). Hopefully the gcc 2.95 | ||
| 51 | * is inteligent enough to decide if it is better to use the | ||
| 52 | * extra register, but evidence so far seems to suggest otherwise. | ||
| 53 | * | ||
| 54 | * Unfortunately, gcc is not able to optimise the high word | ||
| 55 | * out of long long >> 32, or the low word from long long << 32 | ||
| 56 | */ | ||
| 57 | |||
| 58 | #define __get_unaligned_2(__p) \ | ||
| 59 | (__p[0] | __p[1] << 8) | ||
| 60 | |||
| 61 | #define __get_unaligned_4(__p) \ | ||
| 62 | (__p[0] | __p[1] << 8 | __p[2] << 16 | __p[3] << 24) | ||
| 63 | |||
| 64 | #define get_unaligned(ptr) \ | ||
| 65 | ({ \ | ||
| 66 | __typeof__(*(ptr)) __v; \ | ||
| 67 | __u8 *__p = (__u8 *)(ptr); \ | ||
| 68 | switch (sizeof(*(ptr))) { \ | ||
| 69 | case 1: __v = *(ptr); break; \ | ||
| 70 | case 2: __v = __get_unaligned_2(__p); break; \ | ||
| 71 | case 4: __v = __get_unaligned_4(__p); break; \ | ||
| 72 | case 8: { \ | ||
| 73 | unsigned int __v1, __v2; \ | ||
| 74 | __v2 = __get_unaligned_4((__p+4)); \ | ||
| 75 | __v1 = __get_unaligned_4(__p); \ | ||
| 76 | __v = ((unsigned long long)__v2 << 32 | __v1); \ | ||
| 77 | } \ | ||
| 78 | break; \ | ||
| 79 | default: __v = __bug_unaligned_x(__p); break; \ | ||
| 80 | } \ | ||
| 81 | __v; \ | ||
| 82 | }) | ||
| 83 | |||
| 84 | |||
| 85 | static inline void __put_unaligned_2(__u32 __v, register __u8 *__p) | ||
| 86 | { | ||
| 87 | *__p++ = __v; | ||
| 88 | *__p++ = __v >> 8; | ||
| 89 | } | ||
| 90 | |||
| 91 | static inline void __put_unaligned_4(__u32 __v, register __u8 *__p) | ||
| 92 | { | ||
| 93 | __put_unaligned_2(__v >> 16, __p + 2); | ||
| 94 | __put_unaligned_2(__v, __p); | ||
| 95 | } | ||
| 96 | |||
| 97 | static inline void __put_unaligned_8(const unsigned long long __v, register __u8 *__p) | ||
| 98 | { | ||
| 99 | /* | ||
| 100 | * tradeoff: 8 bytes of stack for all unaligned puts (2 | ||
| 101 | * instructions), or an extra register in the long long | ||
| 102 | * case - go for the extra register. | ||
| 103 | */ | ||
| 104 | __put_unaligned_4(__v >> 32, __p+4); | ||
| 105 | __put_unaligned_4(__v, __p); | ||
| 106 | } | ||
| 107 | |||
| 108 | /* | ||
| 109 | * Try to store an unaligned value as efficiently as possible. | ||
| 110 | */ | ||
| 111 | #define put_unaligned(val,ptr) \ | ||
| 112 | ({ \ | ||
| 113 | switch (sizeof(*(ptr))) { \ | ||
| 114 | case 1: \ | ||
| 115 | *(ptr) = (val); \ | ||
| 116 | break; \ | ||
| 117 | case 2: __put_unaligned_2((val),(__u8 *)(ptr)); \ | ||
| 118 | break; \ | ||
| 119 | case 4: __put_unaligned_4((val),(__u8 *)(ptr)); \ | ||
| 120 | break; \ | ||
| 121 | case 8: __put_unaligned_8((val),(__u8 *)(ptr)); \ | ||
| 122 | break; \ | ||
| 123 | default: __bug_unaligned_x(ptr); \ | ||
| 124 | break; \ | ||
| 125 | } \ | ||
| 126 | (void) 0; \ | ||
| 127 | }) | ||
| 128 | 18 | ||
| 19 | #define get_unaligned __get_unaligned_le | ||
| 20 | #define put_unaligned __put_unaligned_le | ||
| 129 | 21 | ||
| 130 | #endif /* __V850_UNALIGNED_H__ */ | 22 | #endif /* _ASM_V850_UNALIGNED_H */ |