[apple/xnu.git] / EXTERNAL_HEADERS / architecture / i386 / reg_help.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) 1991 NeXT Computer, Inc.  All rights reserved.
 *
 *	File:	architecture/i386/reg_help.h
 *	Author:	Mike DeMoney, NeXT Computer, Inc.
 *      Modified for i386 by: Bruce Martin, NeXT Computer, Inc.
 *
 *	This header file defines cpp macros useful for defining
 *	machine register and doing machine-level operations.
 *
 * HISTORY
 * 10-Mar-92  Bruce Martin (bmartin@next.com)
 *	Adapted to i386
 * 23-Jan-91  Mike DeMoney (mike@next.com)
 *	Created.
 */

#ifndef	_ARCH_I386_REG_HELP_H_
#define	_ARCH_I386_REG_HELP_H_

/* Bitfield definition aid */
#define	BITS_WIDTH(msb, lsb)	((msb)-(lsb)+1)
#define	BIT_WIDTH(pos)		(1)	/* mostly to record the position */

/* Mask creation */
#define	MKMASK(width, offset)	(((unsigned)-1)>>(32-(width))<<(offset))
#define	BITSMASK(msb, lsb)	MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
#define	BITMASK(pos)		MKMASK(BIT_WIDTH(pos), pos & 0x1f)

/* Register addresses */
#if	__ASSEMBLER__
# define	REG_ADDR(type, addr)	(addr)
#else	/* __ASSEMBLER__ */
# define	REG_ADDR(type, addr)	(*(volatile type *)(addr))
#endif	/* __ASSEMBLER__ */

/* Cast a register to be an unsigned */
#define	CONTENTS(foo)	(*(unsigned *) &(foo))

/* Stack pointer must always be a multiple of 4 */
#define	STACK_INCR	4
#define	ROUND_FRAME(x)	((((unsigned)(x)) + STACK_INCR - 1) & ~(STACK_INCR-1))

/* STRINGIFY -- perform all possible substitutions, then stringify */
#define	__STR(x)	#x		/* just a helper macro */
#define	STRINGIFY(x)	__STR(x)

/*
 * REG_PAIR_DEF -- define a register pair
 * Register pairs are appropriately aligned to allow access via
 * ld.d and st.d.
 *
 * Usage:
 *	struct foo {
 *		REG_PAIR_DEF(
 *			bar_t *,	barp,
 *			afu_t,		afu
 *		);
 *	};
 *
 * Access to individual entries of the pair is via the REG_PAIR
 * macro (below).
 */
#define	REG_PAIR_DEF(type0, name0, type1, name1)		\
	struct {						\
		type0	name0 __attribute__(( aligned(8) ));	\
		type1	name1;					\
	} name0##_##name1

/*
 * REG_PAIR -- Macro to define names for accessing individual registers
 * of register pairs.
 *
 * Usage:
 *	arg0 is first element of pair
 *	arg1 is second element of pair
 *	arg2 is desired element of pair
 * eg:
 *	#define	foo_barp	REG_PAIR(barp, afu, afu)
 */
#define	REG_PAIR(name0, name1, the_name)			\
	name0##_##name1.the_name

#endif	/* _ARCH_I386_REG_HELP_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	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.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	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.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
	23	*
	24	* File: architecture/i386/reg_help.h
	25	* Author: Mike DeMoney, NeXT Computer, Inc.
	26	* Modified for i386 by: Bruce Martin, NeXT Computer, Inc.
	27	*
	28	* This header file defines cpp macros useful for defining
	29	* machine register and doing machine-level operations.
	30	*
	31	* HISTORY
	32	* 10-Mar-92 Bruce Martin (bmartin@next.com)
	33	* Adapted to i386
	34	* 23-Jan-91 Mike DeMoney (mike@next.com)
	35	* Created.
	36	*/
	37
	38	#ifndef _ARCH_I386_REG_HELP_H_
	39	#define _ARCH_I386_REG_HELP_H_
	40
	41	/* Bitfield definition aid */
	42	#define BITS_WIDTH(msb, lsb) ((msb)-(lsb)+1)
	43	#define BIT_WIDTH(pos) (1) /* mostly to record the position */
	44
	45	/* Mask creation */
	46	#define MKMASK(width, offset) (((unsigned)-1)>>(32-(width))<<(offset))
	47	#define BITSMASK(msb, lsb) MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
	48	#define BITMASK(pos) MKMASK(BIT_WIDTH(pos), pos & 0x1f)
	49
	50	/* Register addresses */
	51	#if __ASSEMBLER__
	52	# define REG_ADDR(type, addr) (addr)
	53	#else /* __ASSEMBLER__ */
	54	# define REG_ADDR(type, addr) ((volatile type )(addr))
	55	#endif /* __ASSEMBLER__ */
	56
	57	/* Cast a register to be an unsigned */
	58	#define CONTENTS(foo) ((unsigned ) &(foo))
	59
	60	/* Stack pointer must always be a multiple of 4 */
	61	#define STACK_INCR 4
	62	#define ROUND_FRAME(x) ((((unsigned)(x)) + STACK_INCR - 1) & ~(STACK_INCR-1))
	63
	64	/* STRINGIFY -- perform all possible substitutions, then stringify */
65	#define __STR(x) #x /* just a helper macro */
66	#define STRINGIFY(x) __STR(x)
67
68	/*
69	* REG_PAIR_DEF -- define a register pair
70	* Register pairs are appropriately aligned to allow access via
71	* ld.d and st.d.
72	*
73	* Usage:
74	* struct foo {
75	* REG_PAIR_DEF(
76	* bar_t *, barp,
77	* afu_t, afu
78	* );
79	* };
80	*
81	* Access to individual entries of the pair is via the REG_PAIR
82	* macro (below).
83	*/
84	#define REG_PAIR_DEF(type0, name0, type1, name1) \
85	struct { \
86	type0 name0 __attribute__(( aligned(8) )); \
87	type1 name1; \
88	} name0##_##name1
89
90	/*
91	* REG_PAIR -- Macro to define names for accessing individual registers
92	* of register pairs.
93	*
94	* Usage:
95	* arg0 is first element of pair
96	* arg1 is second element of pair
97	* arg2 is desired element of pair
98	* eg:
99	* #define foo_barp REG_PAIR(barp, afu, afu)
100	*/
101	#define REG_PAIR(name0, name1, the_name) \
102	name0##_##name1.the_name
103
104	#endif /* _ARCH_I386_REG_HELP_H_ */