diff options
Diffstat (limited to 'include/asm-xtensa/byteorder.h')
-rw-r--r-- | include/asm-xtensa/byteorder.h | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/include/asm-xtensa/byteorder.h b/include/asm-xtensa/byteorder.h deleted file mode 100644 index 07d10ad364d1..000000000000 --- a/include/asm-xtensa/byteorder.h +++ /dev/null | |||
@@ -1,80 +0,0 @@ | |||
1 | /* | ||
2 | * include/asm-xtensa/byteorder.h | ||
3 | * | ||
4 | * This file is subject to the terms and conditions of the GNU General Public | ||
5 | * License. See the file "COPYING" in the main directory of this archive | ||
6 | * for more details. | ||
7 | * | ||
8 | * Copyright (C) 2001 - 2005 Tensilica Inc. | ||
9 | */ | ||
10 | |||
11 | #ifndef _XTENSA_BYTEORDER_H | ||
12 | #define _XTENSA_BYTEORDER_H | ||
13 | |||
14 | #include <asm/types.h> | ||
15 | #include <linux/compiler.h> | ||
16 | |||
17 | #ifdef __XTENSA_EL__ | ||
18 | # define __LITTLE_ENDIAN | ||
19 | #elif defined(__XTENSA_EB__) | ||
20 | # define __BIG_ENDIAN | ||
21 | #else | ||
22 | # error processor byte order undefined! | ||
23 | #endif | ||
24 | |||
25 | #define __SWAB_64_THRU_32__ | ||
26 | |||
27 | static inline __attribute_const__ __u32 __arch_swab32(__u32 x) | ||
28 | { | ||
29 | __u32 res; | ||
30 | /* instruction sequence from Xtensa ISA release 2/2000 */ | ||
31 | __asm__("ssai 8 \n\t" | ||
32 | "srli %0, %1, 16 \n\t" | ||
33 | "src %0, %0, %1 \n\t" | ||
34 | "src %0, %0, %0 \n\t" | ||
35 | "src %0, %1, %0 \n" | ||
36 | : "=&a" (res) | ||
37 | : "a" (x) | ||
38 | ); | ||
39 | return res; | ||
40 | } | ||
41 | #define __arch_swab32 __arch_swab32 | ||
42 | |||
43 | static inline __attribute_const__ __u16 __arch_swab16(__u16 x) | ||
44 | { | ||
45 | /* Given that 'short' values are signed (i.e., can be negative), | ||
46 | * we cannot assume that the upper 16-bits of the register are | ||
47 | * zero. We are careful to mask values after shifting. | ||
48 | */ | ||
49 | |||
50 | /* There exists an anomaly between xt-gcc and xt-xcc. xt-gcc | ||
51 | * inserts an extui instruction after putting this function inline | ||
52 | * to ensure that it uses only the least-significant 16 bits of | ||
53 | * the result. xt-xcc doesn't use an extui, but assumes the | ||
54 | * __asm__ macro follows convention that the upper 16 bits of an | ||
55 | * 'unsigned short' result are still zero. This macro doesn't | ||
56 | * follow convention; indeed, it leaves garbage in the upport 16 | ||
57 | * bits of the register. | ||
58 | |||
59 | * Declaring the temporary variables 'res' and 'tmp' to be 32-bit | ||
60 | * types while the return type of the function is a 16-bit type | ||
61 | * forces both compilers to insert exactly one extui instruction | ||
62 | * (or equivalent) to mask off the upper 16 bits. */ | ||
63 | |||
64 | __u32 res; | ||
65 | __u32 tmp; | ||
66 | |||
67 | __asm__("extui %1, %2, 8, 8\n\t" | ||
68 | "slli %0, %2, 8 \n\t" | ||
69 | "or %0, %0, %1 \n" | ||
70 | : "=&a" (res), "=&a" (tmp) | ||
71 | : "a" (x) | ||
72 | ); | ||
73 | |||
74 | return res; | ||
75 | } | ||
76 | #define __arch_swab16 __arch_swab16 | ||
77 | |||
78 | #include <linux/byteorder.h> | ||
79 | |||
80 | #endif /* _XTENSA_BYTEORDER_H */ | ||