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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 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	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1992 NeXT Computer, Inc.
	24	*
	25	* Byte ordering conversion (for i386).
	26	*
	27	* HISTORY
	28	*
	29	* 8 October 1992 ? at NeXT
	30	* Converted to NXxxx versions. Condensed history.
	31	*
	32	* 18 May 1992 ? at NeXT
	33	* Created.
	34	*/
	35
	36	static __inline__
	37	unsigned short
	38	NXSwapShort(
	39	unsigned short inv
	40	)
	41	{
	42	register unsigned short value = inv;
	43
	44	__asm__ volatile( "xchgb %h1, %b1" : "=q" (value) : "0" (value));
	45
	46	return (value);
	47	}
	48
	49	static __inline__
	50	unsigned long
	51	NXSwapInt(
	52	unsigned long inv
	53	)
	54	{
	55	register unsigned int outv = inv;
	56
	57	__asm__ volatile( "bswap %0" : "=r" (outv) : "0" (outv));
	58
	59	return (outv);
	60	}
	61
	62	static __inline__
	63	unsigned long
	64	NXSwapLong(
	65	unsigned long inv
	66	)
	67	{
	68	unsigned long outv;
	69
	70	__asm__ volatile(
	71	"bswap %0"
	72
	73	: "=r" (outv)
	74	: "0" (inv));
	75
	76	return (outv);
	77	}
	78
	79	static __inline__
	80	unsigned long long
	81	NXSwapLongLong(
	82	unsigned long long inv
83	)
84	{
85	union llconv {
86	unsigned long long ull;
87	unsigned long ul[2];
88	} *inp, outv;
89
90	inp = (union llconv *)&inv;
91
92	outv.ul[0] = NXSwapLong(inp->ul[1]);
93	outv.ul[1] = NXSwapLong(inp->ul[0]);
94
95	return (outv.ull);
96	}
97
98	static __inline__ NXSwappedFloat
99	NXConvertHostFloatToSwapped(float x)
100	{
101	union fconv {
102	float number;
103	NXSwappedFloat sf;
104	};
105	return ((union fconv *)&x)->sf;
106	}
107
108	static __inline__ float
109	NXConvertSwappedFloatToHost(NXSwappedFloat x)
110	{
111	union fconv {
112	float number;
113	NXSwappedFloat sf;
114	};
115	return ((union fconv *)&x)->number;
116	}
117
118	static __inline__ NXSwappedDouble
119	NXConvertHostDoubleToSwapped(double x)
120	{
121	union dconv {
122	double number;
123	NXSwappedDouble sd;
124	};
125	return ((union dconv *)&x)->sd;
126	}
127
128	static __inline__ double
129	NXConvertSwappedDoubleToHost(NXSwappedDouble x)
130	{
131	union dconv {
132	double number;
133	NXSwappedDouble sd;
134	};
135	return ((union dconv *)&x)->number;
136	}
137
138	static __inline__ NXSwappedFloat
139	NXSwapFloat(NXSwappedFloat x)
140	{
141	return NXSwapLong(x);
142	}
143
144	static __inline__ NXSwappedDouble
145	NXSwapDouble(NXSwappedDouble x)
146	{
147	return NXSwapLongLong(x);
148	}