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