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	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_ */