xref: /openbmc/u-boot/arch/m68k/include/asm/byteorder.h (revision 5c8fd32b)
1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
4  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
5  */
6 
7 #ifndef _M68K_BYTEORDER_H
8 #define _M68K_BYTEORDER_H
9 
10 #include <asm/types.h>
11 
12 #ifdef __GNUC__
13 
14 static inline __u32 __sw32(__u32 x)
15 {
16 	__u32 v = x;
17 
18 	return v << 24 |
19 		(v & (__u32)0x0000ff00UL) <<  8 |
20 		(v & (__u32)0x00ff0000UL) >>  8 |
21 		v >> 24;
22 }
23 
24 static inline __u16 __sw16(__u16 x)
25 {
26 	__u16 v = x;
27 
28 	return (v & (__u16)0x00ffU) << 8 |
29 		(v & (__u16)0xff00U) >> 8;
30 }
31 
32 static __inline__ unsigned ld_le16(const volatile unsigned short *addr)
33 {
34 	return __sw16(*addr);
35 }
36 
37 static __inline__ void st_le16(volatile unsigned short *addr,
38 			       const unsigned val)
39 {
40 	*addr = __sw16(val);
41 }
42 
43 static __inline__ unsigned ld_le32(const volatile unsigned *addr)
44 {
45 	return __sw32(*addr);
46 }
47 
48 static __inline__ void st_le32(volatile unsigned *addr, const unsigned val)
49 {
50 	*addr = __sw32(val);
51 }
52 
53 #if 0
54 /* alas, egcs sounds like it has a bug in this code that doesn't use the
55    inline asm correctly, and can cause file corruption. Until I hear that
56    it's fixed, I can live without the extra speed. I hope. */
57 #if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90)
58 #if 0
59 #  define __arch_swab16(x) ld_le16(&x)
60 #  define __arch_swab32(x) ld_le32(&x)
61 #else
62 static __inline__ __attribute__ ((const))
63 __u16 ___arch__swab16(__u16 value)
64 {
65 	return __sw16(value);
66 }
67 
68 static __inline__ __attribute__ ((const))
69 __u32 ___arch__swab32(__u32 value)
70 {
71 	return __sw32(value);
72 }
73 
74 #define __arch__swab32(x) ___arch__swab32(x)
75 #define __arch__swab16(x) ___arch__swab16(x)
76 #endif				/* 0 */
77 
78 #endif
79 
80 /* The same, but returns converted value from the location pointer by addr. */
81 #define __arch__swab16p(addr) ld_le16(addr)
82 #define __arch__swab32p(addr) ld_le32(addr)
83 
84 /* The same, but do the conversion in situ, ie. put the value back to addr. */
85 #define __arch__swab16s(addr) st_le16(addr,*addr)
86 #define __arch__swab32s(addr) st_le32(addr,*addr)
87 #endif
88 
89 #endif				/* __GNUC__ */
90 
91 #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
92 #define __BYTEORDER_HAS_U64__
93 #endif
94 #include <linux/byteorder/big_endian.h>
95 
96 #endif				/* _M68K_BYTEORDER_H */
97