/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * 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@
 */
#ifndef _MACH_O_ARCH_H_
#define _MACH_O_ARCH_H_
/*
 * Copyright (c) 1997 Apple Computer, Inc.
 *
 * Functions that deal with information about architectures.
 *
 */

#include <stdint.h>
#include <mach-o/machine.h>

enum NXByteOrder {
  NX_UnknownByteOrder,
  NX_LittleEndian,
  NX_BigEndian
};

/* The NXArchInfo structs contain the architectures symbolic name
 * (such as "ppc"), its CPU type and CPU subtype as defined in
 * mach/machine.h, the byte order for the architecture, and a
 * describing string (such as "PowerPC").
 * There will both be entries for specific CPUs (such as ppc604e) as
 * well as generic "family" entries (such as ppc).
 */
typedef struct {
    const char *name;
    cpu_type_t cputype;
    cpu_subtype_t cpusubtype;
    enum NXByteOrder byteorder;
    const char *description;
} NXArchInfo;

#if __cplusplus
extern "C" {
#endif /* __cplusplus */

/* NXGetAllArchInfos() returns a pointer to an array of all known
 * NXArchInfo structures.  The last NXArchInfo is marked by a NULL name.
 */
extern const NXArchInfo *NXGetAllArchInfos(void);

/* NXGetLocalArchInfo() returns the NXArchInfo for the local host, or NULL
 * if none is known. 
 */
extern const NXArchInfo *NXGetLocalArchInfo(void);

/* NXGetArchInfoFromName() and NXGetArchInfoFromCpuType() return the
 * NXArchInfo from the architecture's name or cputype/cpusubtype
 * combination.  A cpusubtype of CPU_SUBTYPE_MULTIPLE can be used
 * to request the most general NXArchInfo known for the given cputype.
 * NULL is returned if no matching NXArchInfo can be found.
 */
extern const NXArchInfo *NXGetArchInfoFromName(const char *name);
extern const NXArchInfo *NXGetArchInfoFromCpuType(cpu_type_t cputype,
						  cpu_subtype_t cpusubtype);

/* NXFindBestFatArch() is passed a cputype and cpusubtype and a set of
 * fat_arch structs and selects the best one that matches (if any) and returns
 * a pointer to that fat_arch struct (or NULL).  The fat_arch structs must be
 * in the host byte order and correct such that the fat_archs really points to
 * enough memory for nfat_arch structs.  It is possible that this routine could
 * fail if new cputypes or cpusubtypes are added and an old version of this
 * routine is used.  But if there is an exact match between the cputype and
 * cpusubtype and one of the fat_arch structs this routine will always succeed.
 */
extern struct fat_arch *NXFindBestFatArch(cpu_type_t cputype,
					  cpu_subtype_t cpusubtype,
					  struct fat_arch *fat_archs,
					  uint32_t nfat_archs);

/* NXCombineCpuSubtypes() returns the resulting cpusubtype when combining two
 * different cpusubtypes for the specified cputype.  If the two cpusubtypes
 * can't be combined (the specific subtypes are mutually exclusive) -1 is
 * returned indicating it is an error to combine them.  This can also fail and
 * return -1 if new cputypes or cpusubtypes are added and an old version of
 * this routine is used.  But if the cpusubtypes are the same they can always
 * be combined and this routine will return the cpusubtype pass in.
 */
extern cpu_subtype_t NXCombineCpuSubtypes(cpu_type_t cputype,
					  cpu_subtype_t cpusubtype1,
					  cpu_subtype_t cpusubtype2);

#if __cplusplus
};
#endif /* __cplusplus */

#endif /* _MACH_O_ARCH_H_ */
