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 #define __sw16(x) \ 14 ((__u16)( \ 15 (((__u16)(x) & (__u16)0x00ffU) << 8) | \ 16 (((__u16)(x) & (__u16)0xff00U) >> 8) )) 17 #define __sw32(x) \ 18 ((__u32)( \ 19 (((__u32)(x)) << 24) | \ 20 (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ 21 (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ 22 (((__u32)(x)) >> 24) )) 23 24 static __inline__ unsigned ld_le16(const volatile unsigned short *addr) 25 { 26 unsigned result = *addr; 27 return __sw16(result); 28 } 29 30 static __inline__ void st_le16(volatile unsigned short *addr, 31 const unsigned val) 32 { 33 *addr = __sw16(val); 34 } 35 36 static __inline__ unsigned ld_le32(const volatile unsigned *addr) 37 { 38 unsigned result = *addr; 39 return __sw32(result); 40 } 41 42 static __inline__ void st_le32(volatile unsigned *addr, const unsigned val) 43 { 44 *addr = __sw32(val); 45 } 46 47 #if 0 48 /* alas, egcs sounds like it has a bug in this code that doesn't use the 49 inline asm correctly, and can cause file corruption. Until I hear that 50 it's fixed, I can live without the extra speed. I hope. */ 51 #if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90) 52 #if 0 53 # define __arch_swab16(x) ld_le16(&x) 54 # define __arch_swab32(x) ld_le32(&x) 55 #else 56 static __inline__ __attribute__ ((const)) 57 __u16 ___arch__swab16(__u16 value) 58 { 59 return __sw16(value); 60 } 61 62 static __inline__ __attribute__ ((const)) 63 __u32 ___arch__swab32(__u32 value) 64 { 65 return __sw32(value); 66 } 67 68 #define __arch__swab32(x) ___arch__swab32(x) 69 #define __arch__swab16(x) ___arch__swab16(x) 70 #endif /* 0 */ 71 72 #endif 73 74 /* The same, but returns converted value from the location pointer by addr. */ 75 #define __arch__swab16p(addr) ld_le16(addr) 76 #define __arch__swab32p(addr) ld_le32(addr) 77 78 /* The same, but do the conversion in situ, ie. put the value back to addr. */ 79 #define __arch__swab16s(addr) st_le16(addr,*addr) 80 #define __arch__swab32s(addr) st_le32(addr,*addr) 81 #endif 82 83 #endif /* __GNUC__ */ 84 85 #if defined(__GNUC__) && !defined(__STRICT_ANSI__) 86 #define __BYTEORDER_HAS_U64__ 87 #endif 88 #include <linux/byteorder/big_endian.h> 89 90 #endif /* _M68K_BYTEORDER_H */ 91