[apple/xnu.git] / EXTERNAL_HEADERS / architecture / i386 / byte_order.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1992 NeXT Computer, Inc.
 *
 * Byte ordering conversion (for i386).
 *
 * HISTORY
 *
 * 8 October 1992 ? at NeXT
 *	Converted to NXxxx versions.  Condensed history.
 *
 * 18 May 1992 ? at NeXT
 *	Created.
 */
 
static __inline__
unsigned short
NXSwapShort(
    unsigned short	inv
)
{
    register unsigned short value = inv;
    
    __asm__ volatile( "xchgb %h1, %b1" : "=q" (value) : "0" (value));

    return (value);
}
 
static __inline__
unsigned long
NXSwapInt(
    unsigned long inv
)
{
    register unsigned int outv = inv;
    
    __asm__ volatile( "bswap %0" : "=r"	(outv) : "0" (outv));
	
    return (outv);
}
 
static __inline__
unsigned long
NXSwapLong(
    unsigned long	inv
)
{
    unsigned long	outv;
    
    __asm__ volatile(
    	"bswap %0"
	
	: "=r"	(outv)
	: "0"	(inv));
	
    return (outv);
}

static __inline__
unsigned long long
NXSwapLongLong(
    unsigned long long	inv
)
{
    union llconv {
	unsigned long long	ull;
	unsigned long		ul[2];
    } *inp, outv;
    
    inp = (union llconv *)&inv;
    
    outv.ul[0] = NXSwapLong(inp->ul[1]);
    outv.ul[1] = NXSwapLong(inp->ul[0]);
    	
    return (outv.ull);
}

static __inline__ NXSwappedFloat
NXConvertHostFloatToSwapped(float x)
{
    union fconv {
	float number;
	NXSwappedFloat sf;
    };
    return ((union fconv *)&x)->sf;
}

static __inline__ float
NXConvertSwappedFloatToHost(NXSwappedFloat x)
{
    union fconv {
	float number;
	NXSwappedFloat sf;
    };
    return ((union fconv *)&x)->number;
}

static __inline__ NXSwappedDouble
NXConvertHostDoubleToSwapped(double x)
{
    union dconv {
	double number;
	NXSwappedDouble sd;
    };
    return ((union dconv *)&x)->sd;
}

static __inline__ double
NXConvertSwappedDoubleToHost(NXSwappedDouble x)
{
    union dconv {
	double number;
	NXSwappedDouble sd;
    };
    return ((union dconv *)&x)->number;
}

static __inline__ NXSwappedFloat
NXSwapFloat(NXSwappedFloat x)
{
    return NXSwapLong(x);
}

static __inline__ NXSwappedDouble
NXSwapDouble(NXSwappedDouble x)
{
    return NXSwapLongLong(x);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1992 NeXT Computer, Inc.
	27	*
	28	* Byte ordering conversion (for i386).
	29	*
	30	* HISTORY
	31	*
	32	* 8 October 1992 ? at NeXT
	33	* Converted to NXxxx versions. Condensed history.
	34	*
	35	* 18 May 1992 ? at NeXT
	36	* Created.
	37	*/
	38
	39	static __inline__
	40	unsigned short
	41	NXSwapShort(
	42	unsigned short inv
	43	)
	44	{
	45	register unsigned short value = inv;
	46
	47	__asm__ volatile( "xchgb %h1, %b1" : "=q" (value) : "0" (value));
	48
	49	return (value);
	50	}
	51
	52	static __inline__
	53	unsigned long
	54	NXSwapInt(
	55	unsigned long inv
	56	)
	57	{
	58	register unsigned int outv = inv;
	59
	60	__asm__ volatile( "bswap %0" : "=r" (outv) : "0" (outv));
	61
	62	return (outv);
	63	}
	64
	65	static __inline__
	66	unsigned long
	67	NXSwapLong(
	68	unsigned long inv
	69	)
	70	{
	71	unsigned long outv;
	72
	73	__asm__ volatile(
	74	"bswap %0"
	75
	76	: "=r" (outv)
	77	: "0" (inv));
	78
	79	return (outv);
	80	}
	81
	82	static __inline__
	83	unsigned long long
	84	NXSwapLongLong(
	85	unsigned long long inv
86	)
87	{
88	union llconv {
89	unsigned long long ull;
90	unsigned long ul[2];
91	} *inp, outv;
92
93	inp = (union llconv *)&inv;
94
95	outv.ul[0] = NXSwapLong(inp->ul[1]);
96	outv.ul[1] = NXSwapLong(inp->ul[0]);
97
98	return (outv.ull);
99	}
100
101	static __inline__ NXSwappedFloat
102	NXConvertHostFloatToSwapped(float x)
103	{
104	union fconv {
105	float number;
106	NXSwappedFloat sf;
107	};
108	return ((union fconv *)&x)->sf;
109	}
110
111	static __inline__ float
112	NXConvertSwappedFloatToHost(NXSwappedFloat x)
113	{
114	union fconv {
115	float number;
116	NXSwappedFloat sf;
117	};
118	return ((union fconv *)&x)->number;
119	}
120
121	static __inline__ NXSwappedDouble
122	NXConvertHostDoubleToSwapped(double x)
123	{
124	union dconv {
125	double number;
126	NXSwappedDouble sd;
127	};
128	return ((union dconv *)&x)->sd;
129	}
130
131	static __inline__ double
132	NXConvertSwappedDoubleToHost(NXSwappedDouble x)
133	{
134	union dconv {
135	double number;
136	NXSwappedDouble sd;
137	};
138	return ((union dconv *)&x)->number;
139	}
140
141	static __inline__ NXSwappedFloat
142	NXSwapFloat(NXSwappedFloat x)
143	{
144	return NXSwapLong(x);
145	}
146
147	static __inline__ NXSwappedDouble
148	NXSwapDouble(NXSwappedDouble x)
149	{
150	return NXSwapLongLong(x);
151	}