1/* 2 * Copyright (c) 2000-2008 Apple Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23 24#ifndef _ARCH_ARM_REG_HELP_H_ 25#define _ARCH_ARM_REG_HELP_H_ 26 27/* Bitfield definition aid */ 28#define BITS_WIDTH(msb, lsb) ((msb)-(lsb)+1) 29#define BIT_WIDTH(pos) (1) /* mostly to record the position */ 30 31/* Mask creation */ 32#define MKMASK(width, offset) (((unsigned)-1)>>(32-(width))<<(offset)) 33#define BITSMASK(msb, lsb) MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f) 34#define BITMASK(pos) MKMASK(BIT_WIDTH(pos), pos & 0x1f) 35 36/* Register addresses */ 37#if __ASSEMBLER__ 38# define REG_ADDR(type, addr) (addr) 39#else /* __ASSEMBLER__ */ 40# define REG_ADDR(type, addr) (*(volatile type *)(addr)) 41#endif /* __ASSEMBLER__ */ 42 43/* Cast a register to be an unsigned */ 44#if defined(__arm__) 45#define CONTENTS(foo) (*(unsigned*) &(foo)) 46/* Stack pointer must always be a multiple of 4 */ 47#define STACK_INCR 4 48#else 49#error Unknown architecture. 50#endif 51 52#define ROUND_FRAME(x) ((((unsigned)(x)) + STACK_INCR - 1) & ~(STACK_INCR-1)) 53 54/* STRINGIFY -- perform all possible substitutions, then stringify */ 55#define __STR(x) #x /* just a helper macro */ 56#define STRINGIFY(x) __STR(x) 57 58#endif /* _ARCH_ARM_REG_HELP_H_ */ 59