diff options
Diffstat (limited to 'arch/alpha')
-rw-r--r-- | arch/alpha/include/asm/Kbuild | 1 | ||||
-rw-r--r-- | arch/alpha/include/asm/byteorder.h | 42 | ||||
-rw-r--r-- | arch/alpha/include/asm/swab.h | 42 |
3 files changed, 44 insertions, 41 deletions
diff --git a/arch/alpha/include/asm/Kbuild b/arch/alpha/include/asm/Kbuild index b7c8f188b313..4dad27360576 100644 --- a/arch/alpha/include/asm/Kbuild +++ b/arch/alpha/include/asm/Kbuild | |||
@@ -9,3 +9,4 @@ unifdef-y += console.h | |||
9 | unifdef-y += fpu.h | 9 | unifdef-y += fpu.h |
10 | unifdef-y += sysinfo.h | 10 | unifdef-y += sysinfo.h |
11 | unifdef-y += compiler.h | 11 | unifdef-y += compiler.h |
12 | unifdef-y += swab.h | ||
diff --git a/arch/alpha/include/asm/byteorder.h b/arch/alpha/include/asm/byteorder.h index 58e958fc7f1b..6772f3168701 100644 --- a/arch/alpha/include/asm/byteorder.h +++ b/arch/alpha/include/asm/byteorder.h | |||
@@ -1,47 +1,7 @@ | |||
1 | #ifndef _ALPHA_BYTEORDER_H | 1 | #ifndef _ALPHA_BYTEORDER_H |
2 | #define _ALPHA_BYTEORDER_H | 2 | #define _ALPHA_BYTEORDER_H |
3 | 3 | ||
4 | #include <asm/types.h> | 4 | #include <asm/swab.h> |
5 | #include <linux/compiler.h> | ||
6 | #include <asm/compiler.h> | ||
7 | |||
8 | #ifdef __GNUC__ | ||
9 | |||
10 | static inline __attribute_const__ __u32 __arch__swab32(__u32 x) | ||
11 | { | ||
12 | /* | ||
13 | * Unfortunately, we can't use the 6 instruction sequence | ||
14 | * on ev6 since the latency of the UNPKBW is 3, which is | ||
15 | * pretty hard to hide. Just in case a future implementation | ||
16 | * has a lower latency, here's the sequence (also by Mike Burrows) | ||
17 | * | ||
18 | * UNPKBW a0, v0 v0: 00AA00BB00CC00DD | ||
19 | * SLL v0, 24, a0 a0: BB00CC00DD000000 | ||
20 | * BIS v0, a0, a0 a0: BBAACCBBDDCC00DD | ||
21 | * EXTWL a0, 6, v0 v0: 000000000000BBAA | ||
22 | * ZAP a0, 0xf3, a0 a0: 00000000DDCC0000 | ||
23 | * ADDL a0, v0, v0 v0: ssssssssDDCCBBAA | ||
24 | */ | ||
25 | |||
26 | __u64 t0, t1, t2, t3; | ||
27 | |||
28 | t0 = __kernel_inslh(x, 7); /* t0 : 0000000000AABBCC */ | ||
29 | t1 = __kernel_inswl(x, 3); /* t1 : 000000CCDD000000 */ | ||
30 | t1 |= t0; /* t1 : 000000CCDDAABBCC */ | ||
31 | t2 = t1 >> 16; /* t2 : 0000000000CCDDAA */ | ||
32 | t0 = t1 & 0xFF00FF00; /* t0 : 00000000DD00BB00 */ | ||
33 | t3 = t2 & 0x00FF00FF; /* t3 : 0000000000CC00AA */ | ||
34 | t1 = t0 + t3; /* t1 : ssssssssDDCCBBAA */ | ||
35 | |||
36 | return t1; | ||
37 | } | ||
38 | |||
39 | #define __arch__swab32 __arch__swab32 | ||
40 | |||
41 | #endif /* __GNUC__ */ | ||
42 | |||
43 | #define __BYTEORDER_HAS_U64__ | ||
44 | |||
45 | #include <linux/byteorder/little_endian.h> | 5 | #include <linux/byteorder/little_endian.h> |
46 | 6 | ||
47 | #endif /* _ALPHA_BYTEORDER_H */ | 7 | #endif /* _ALPHA_BYTEORDER_H */ |
diff --git a/arch/alpha/include/asm/swab.h b/arch/alpha/include/asm/swab.h new file mode 100644 index 000000000000..68e7089e02d5 --- /dev/null +++ b/arch/alpha/include/asm/swab.h | |||
@@ -0,0 +1,42 @@ | |||
1 | #ifndef _ALPHA_SWAB_H | ||
2 | #define _ALPHA_SWAB_H | ||
3 | |||
4 | #include <asm/types.h> | ||
5 | #include <linux/compiler.h> | ||
6 | #include <asm/compiler.h> | ||
7 | |||
8 | #ifdef __GNUC__ | ||
9 | |||
10 | static inline __attribute_const__ __u32 __arch_swab32(__u32 x) | ||
11 | { | ||
12 | /* | ||
13 | * Unfortunately, we can't use the 6 instruction sequence | ||
14 | * on ev6 since the latency of the UNPKBW is 3, which is | ||
15 | * pretty hard to hide. Just in case a future implementation | ||
16 | * has a lower latency, here's the sequence (also by Mike Burrows) | ||
17 | * | ||
18 | * UNPKBW a0, v0 v0: 00AA00BB00CC00DD | ||
19 | * SLL v0, 24, a0 a0: BB00CC00DD000000 | ||
20 | * BIS v0, a0, a0 a0: BBAACCBBDDCC00DD | ||
21 | * EXTWL a0, 6, v0 v0: 000000000000BBAA | ||
22 | * ZAP a0, 0xf3, a0 a0: 00000000DDCC0000 | ||
23 | * ADDL a0, v0, v0 v0: ssssssssDDCCBBAA | ||
24 | */ | ||
25 | |||
26 | __u64 t0, t1, t2, t3; | ||
27 | |||
28 | t0 = __kernel_inslh(x, 7); /* t0 : 0000000000AABBCC */ | ||
29 | t1 = __kernel_inswl(x, 3); /* t1 : 000000CCDD000000 */ | ||
30 | t1 |= t0; /* t1 : 000000CCDDAABBCC */ | ||
31 | t2 = t1 >> 16; /* t2 : 0000000000CCDDAA */ | ||
32 | t0 = t1 & 0xFF00FF00; /* t0 : 00000000DD00BB00 */ | ||
33 | t3 = t2 & 0x00FF00FF; /* t3 : 0000000000CC00AA */ | ||
34 | t1 = t0 + t3; /* t1 : ssssssssDDCCBBAA */ | ||
35 | |||
36 | return t1; | ||
37 | } | ||
38 | #define __arch_swab32 __arch_swab32 | ||
39 | |||
40 | #endif /* __GNUC__ */ | ||
41 | |||
42 | #endif /* _ALPHA_SWAB_H */ | ||