1#ifndef _PPC_BYTEORDER_H
2#define _PPC_BYTEORDER_H
3
4#include <asm/types.h>
5
6#ifdef __GNUC__
7
8static __inline__ unsigned ld_le16(const volatile unsigned short *addr)
9{
10	unsigned val;
11
12	__asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
13	return val;
14}
15
16static __inline__ void st_le16(volatile unsigned short *addr, const unsigned val)
17{
18	__asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
19}
20
21static __inline__ unsigned ld_le32(const volatile unsigned *addr)
22{
23	unsigned val;
24
25	__asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
26	return val;
27}
28
29static __inline__ void st_le32(volatile unsigned *addr, const unsigned val)
30{
31	__asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
32}
33
34/* alas, egcs sounds like it has a bug in this code that doesn't use the
35   inline asm correctly, and can cause file corruption. Until I hear that
36   it's fixed, I can live without the extra speed. I hope. */
37#if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90)
38#if 0
39#  define __arch_swab16(x) ld_le16(&x)
40#  define __arch_swab32(x) ld_le32(&x)
41#else
42static __inline__ __attribute__((const)) __u16 ___arch__swab16(__u16 value)
43{
44	__u16 result;
45
46	__asm__("rlwimi %0,%1,8,16,23"
47	    : "=r" (result)
48	    : "r" (value), "0" (value >> 8));
49	return result;
50}
51
52static __inline__ __attribute__((const)) __u32 ___arch__swab32(__u32 value)
53{
54	__u32 result;
55
56	__asm__("rlwimi %0,%1,24,16,23\n\t"
57	    "rlwimi %0,%1,8,8,15\n\t"
58	    "rlwimi %0,%1,24,0,7"
59	    : "=r" (result)
60	    : "r" (value), "0" (value >> 24));
61	return result;
62}
63#define __arch__swab32(x) ___arch__swab32(x)
64#define __arch__swab16(x) ___arch__swab16(x)
65#endif /* 0 */
66
67#endif
68
69/* The same, but returns converted value from the location pointer by addr. */
70#define __arch__swab16p(addr) ld_le16(addr)
71#define __arch__swab32p(addr) ld_le32(addr)
72
73/* The same, but do the conversion in situ, ie. put the value back to addr. */
74#define __arch__swab16s(addr) st_le16(addr,*addr)
75#define __arch__swab32s(addr) st_le32(addr,*addr)
76
77#endif /* __GNUC__ */
78
79#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
80#define __BYTEORDER_HAS_U64__
81#endif
82#include <linux/byteorder/big_endian.h>
83
84#endif /* _PPC_BYTEORDER_H */
85