FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/spl/sys/isa_defs.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #ifndef _SYS_ISA_DEFS_H
    #define _SYS_ISA_DEFS_H
    #include <sys/endian.h>
    
    /*
     * This header file serves to group a set of well known defines and to
     * set these for each instruction set architecture.  These defines may
     * be divided into two groups;  characteristics of the processor and
     * implementation choices for Solaris on a processor.
     *
     * Processor Characteristics:
     *
     * _LITTLE_ENDIAN / _BIG_ENDIAN:
     *      The natural byte order of the processor.  A pointer to an int points
     *      to the least/most significant byte of that int.
     *
     *
     * Implementation Choices:
     *
     * _ILP32 / _LP64:
     *      This specifies the compiler data type implementation as specified in
     *      the relevant ABI.  The choice between these is strongly influenced
     *      by the underlying hardware, but is not absolutely tied to it.
     *      Currently only two data type models are supported:
     *
     *      _ILP32:
     *              Int/Long/Pointer are 32 bits.  This is the historical UNIX
     *              and Solaris implementation.  Due to its historical standing,
     *              this is the default case.
     *
     *      _LP64:
     *              Long/Pointer are 64 bits, Int is 32 bits.  This is the chosen
     *              implementation for 64-bit ABIs such as SPARC V9.
     *
     *      In all cases, Char is 8 bits and Short is 16 bits.
     *
     * _SUNOS_VTOC_8 / _SUNOS_VTOC_16 / _SVR4_VTOC_16:
     *      This specifies the form of the disk VTOC (or label):
     *
     *      _SUNOS_VTOC_8:
     *              This is a VTOC form which is upwardly compatible with the
     *              SunOS 4.x disk label and allows 8 partitions per disk.
     *
     *      _SUNOS_VTOC_16:
     *              In this format the incore vtoc image matches the ondisk
     *              version.  It allows 16 slices per disk, and is not
     *              compatible with the SunOS 4.x disk label.
     *
     *      Note that these are not the only two VTOC forms possible and
     *      additional forms may be added.  One possible form would be the
     *      SVr4 VTOC form.  The symbol for that is reserved now, although
     *      it is not implemented.
     *
     *      _SVR4_VTOC_16:
     *              This VTOC form is compatible with the System V Release 4
     *              VTOC (as implemented on the SVr4 Intel and 3b ports) with
     *              16 partitions per disk.
     *
     *
     * __x86
     *      This is ONLY a synonym for defined(__i386) || defined(__amd64)
     *      which is useful only insofar as these two architectures share
     *      common attributes.  Analogous to __sparc.
     */
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * The following set of definitions characterize Solaris on AMD's
     * 64-bit systems.
    */
   #if defined(__x86_64) || defined(__amd64)
   
   #if !defined(__amd64)
   #define __amd64         /* preferred guard */
   #endif
   
   #if !defined(__x86)
   #define __x86
   #endif
   
   /*
    * Define the appropriate "implementation choices".
    */
   #if !defined(_LP64)
   #error "_LP64 not defined"
   #endif
   #define _SUNOS_VTOC_16
   
   /*
    * The feature test macro __i386 is generic for all processors implementing
    * the Intel 386 instruction set or a superset of it.  Specifically, this
    * includes all members of the 386, 486, and Pentium family of processors.
    */
   #elif defined(__i386) || defined(__i386__)
   
   #if !defined(__i386)
   #define __i386
   #endif
   
   #if !defined(__x86)
   #define __x86
   #endif
   
   /*
    * Define the appropriate "implementation choices".
    */
   #if !defined(_ILP32)
   #define _ILP32
   #endif
   #define _SUNOS_VTOC_16
   
   #elif defined(__aarch64__)
   
   /*
    * Define the appropriate "implementation choices"
    */
   #if !defined(_LP64)
   #error "_LP64 not defined"
   #endif
   #define _SUNOS_VTOC_16
   
   #elif defined(__riscv)
   
   /*
    * Define the appropriate "implementation choices"
    */
   #if !defined(_LP64)
   #define _LP64
   #endif
   #define _SUNOS_VTOC_16
   
   #elif defined(__arm__)
   
   /*
    * Define the appropriate "implementation choices".
    */
   #if !defined(_ILP32)
   #define _ILP32
   #endif
   #define _SUNOS_VTOC_16
   
   #elif defined(__mips__)
   
   #if defined(__mips_n64)
   /*
    * Define the appropriate "implementation choices".
    */
   #if !defined(_LP64)
   #error "_LP64 not defined"
   #endif
   #else
   /*
    * Define the appropriate "implementation choices".
    */
   #if !defined(_ILP32)
   #define _ILP32
   #endif
   #endif
   #define _SUNOS_VTOC_16
   
   #elif defined(__powerpc__)
   
   #if !defined(__powerpc)
   #define __powerpc
   #endif
   
   #define _SUNOS_VTOC_16  1
   
   /*
    * The following set of definitions characterize the Solaris on SPARC systems.
    *
    * The symbol __sparc indicates any of the SPARC family of processor
    * architectures.  This includes SPARC V7, SPARC V8 and SPARC V9.
    *
    * The symbol __sparcv8 indicates the 32-bit SPARC V8 architecture as defined
    * by Version 8 of the SPARC Architecture Manual.  (SPARC V7 is close enough
    * to SPARC V8 for the former to be subsumed into the latter definition.)
    *
    * The symbol __sparcv9 indicates the 64-bit SPARC V9 architecture as defined
    * by Version 9 of the SPARC Architecture Manual.
    *
    * The symbols __sparcv8 and __sparcv9 are mutually exclusive, and are only
    * relevant when the symbol __sparc is defined.
    */
   /*
    * XXX Due to the existence of 5110166, "defined(__sparcv9)" needs to be added
    * to support backwards builds.  This workaround should be removed in s10_71.
    */
   #elif defined(__sparc) || defined(__sparcv9) || defined(__sparc__)
   #if !defined(__sparc)
   #define __sparc
   #endif
   
   /*
    * You can be 32-bit or 64-bit, but not both at the same time.
    */
   #if defined(__sparcv8) && defined(__sparcv9)
   #error  "SPARC Versions 8 and 9 are mutually exclusive choices"
   #endif
   
   /*
    * Existing compilers do not set __sparcv8.  Years will transpire before
    * the compilers can be depended on to set the feature test macro. In
    * the interim, we'll set it here on the basis of historical behaviour;
    * if you haven't asked for SPARC V9, then you must've meant SPARC V8.
    */
   #if !defined(__sparcv9) && !defined(__sparcv8)
   #define __sparcv8
   #endif
   
   /*
    * Define the appropriate "implementation choices" shared between versions.
    */
   #define _SUNOS_VTOC_8
   
   /*
    * The following set of definitions characterize the implementation of
    * 32-bit Solaris on SPARC V8 systems.
    */
   #if defined(__sparcv8)
   
   /*
    * Define the appropriate "implementation choices"
    */
   #define _ILP32
   
   /*
    * The following set of definitions characterize the implementation of
    * 64-bit Solaris on SPARC V9 systems.
    */
   #elif defined(__sparcv9)
   
   /*
    * Define the appropriate "implementation choices"
    */
   #if !defined(_LP64)
   #error "_LP64 not defined"
   #endif
   
   #else
   #error  "unknown SPARC version"
   #endif
   
   /*
    * #error is strictly ansi-C, but works as well as anything for K&R systems.
    */
   #else
   #error "ISA not supported"
   #endif
   
   #if defined(_ILP32) && defined(_LP64)
   #error "Both _ILP32 and _LP64 are defined"
   #endif
   
   #if BYTE_ORDER == _BIG_ENDIAN
   #define _ZFS_BIG_ENDIAN
   #elif BYTE_ORDER == _LITTLE_ENDIAN
   #define _ZFS_LITTLE_ENDIAN
   #else
   #error "unknown byte order"
   #endif
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _SYS_ISA_DEFS_H */

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