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