1 #ifndef _PPC_BYTEORDER_H
2 #define _PPC_BYTEORDER_H
3
4 /*
5 * $Id: byteorder.h,v 1.14 1998/08/12 05:07:12 paulus Exp $
6 */
7
8 #include <asm/types.h>
9
10 #ifdef __KERNEL__
11 #ifdef __GNUC__
12
13 extern __inline__ unsigned ld_le16(const volatile unsigned short *addr)
14 {
15 unsigned val;
16
17 __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
18 return val;
19 }
20
21 extern __inline__ void st_le16(volatile unsigned short *addr, const unsigned val)
22 {
23 __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
24 }
25
26 extern __inline__ unsigned ld_le32(const volatile unsigned *addr)
27 {
28 unsigned val;
29
30 __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
31 return val;
32 }
33
34 extern __inline__ void st_le32(volatile unsigned *addr, const unsigned val)
35 {
36 __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
37 }
38
39 /* alas, egcs sounds like it has a bug in this code that doesn't use the
40 inline asm correctly, and can cause file corruption. Until I hear that
41 it's fixed, I can live without the extra speed. I hope. */
42 #if 0
43 static __inline__ __const__ __u16 ___arch__swab16(__u16 value)
44 {
45 __u16 result;
46
47 __asm__("rlwimi %0,%1,8,16,23"
48 : "=r" (result)
49 : "r" (value), "" (value >> 8));
50 return result;
51 }
52
53 static __inline__ __const__ __u32 ___arch__swab32(__u32 value)
54 {
55 __u32 result;
56
57 __asm__("rlwimi %0,%1,24,16,23\n\t"
58 "rlwimi %0,%1,8,8,15\n\t"
59 "rlwimi %0,%1,24,0,7"
60 : "=r" (result)
61 : "r" (value), "" (value >> 24));
62 return result;
63 }
64 #define __arch__swab32(x) ___arch__swab32(x)
65 #define __arch__swab16(x) ___arch__swab16(x)
66 #endif /* 0 */
67
68 /* The same, but returns converted value from the location pointer by addr. */
69 #define __arch__swab16p(addr) ld_le16(addr)
70 #define __arch__swab32p(addr) ld_le32(addr)
71
72 /* The same, but do the conversion in situ, ie. put the value back to addr. */
73 #define __arch__swab16s(addr) st_le16(addr,*addr)
74 #define __arch__swab32s(addr) st_le32(addr,*addr)
75
76 #ifndef __STRICT_ANSI__
77 #define __BYTEORDER_HAS_U64__
78 #endif
79
80 #endif /* __GNUC__ */
81 #endif /* __KERNEL__ */
82
83 #include <linux/byteorder/big_endian.h>
84
85 #endif /* _PPC_BYTEORDER_H */
86
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