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Annotation of kernel/machdep/ppc/kern_machdep.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  *     Copyright (C) 1998  Apple Computer, Inc.
        !            27:  *
        !            28:  *     File:   machdep/ppc/kern_machdep.c
        !            29:  *
        !            30:  *     Machine-specific kernel routines.
        !            31:  *
        !            32:  * HISTORY
        !            33:  *  8-jun-1998 Umesh Vaishampayan  ([email protected])
        !            34:  *             Replaced grade_cpu_subtype() and check_cpu_subtype() with
        !            35:  *             the implementation by Kevin Enderby.
        !            36:  *             Deleted obsolete history.
        !            37:  *
        !            38:  */
        !            39: 
        !            40: #import <cpus.h>
        !            41: #import        <sys/types.h>
        !            42: #import        <mach/machine.h>
        !            43: #import        <machine/cpu.h>
        !            44: 
        !            45: /*
        !            46:  * Routine: grade_cpu_subtype()
        !            47:  *
        !            48:  * Function:
        !            49:  *     Return a relative preference for cpu_subtypes in fat executable files.
        !            50:  *     The higher the grade, the higher the preference.
        !            51:  *     A grade of 0 means not acceptable.
        !            52:  */
        !            53: 
        !            54: int
        !            55: grade_cpu_subtype (cpu_subtype)
        !            56: cpu_subtype_t  cpu_subtype;
        !            57: {
        !            58:        struct machine_slot *ms = &machine_slot[cpu_number()];
        !            59: 
        !            60:        /*
        !            61:         * This code should match cpusubtype_findbestarch() in best_arch.c in the
        !            62:         * cctools project.  As of 2/16/98 this is what has been agreed upon for
        !            63:         * the PowerPC subtypes.  If an exact match is not found the subtype will
        !            64:         * be picked from the following order:
        !            65:         *              750, 604e, 604, 603ev, 603e, 603, ALL
        !            66:         * Note the 601 is NOT in the list above.  It is only picked via an exact
        !            67:         * match. For details see Radar 2213821.
        !            68:         *
        !            69:         * To implement this function to follow what was agreed upon above, we use
        !            70:         * the fact there are currently 8 different subtypes.  Exact matches return
        !            71:         * the value 8, the value 0 is returned for 601 that is not an exact match,
        !            72:         * and the values 7 thru 1 are returned for the subtypes listed in the order
        !            73:         * above.
        !            74:         */
        !            75:        if (ms->cpu_subtype == cpu_subtype)
        !            76:                return 8;
        !            77:        if (cpu_subtype == CPU_SUBTYPE_POWERPC_601)
        !            78:                return 0;
        !            79:        switch (cpu_subtype) {
        !            80:                case CPU_SUBTYPE_POWERPC_750:
        !            81:                        return 7;
        !            82:                case CPU_SUBTYPE_POWERPC_604e:
        !            83:                        return 6;
        !            84:                case CPU_SUBTYPE_POWERPC_604:
        !            85:                        return 5;
        !            86:                case CPU_SUBTYPE_POWERPC_603ev:
        !            87:                        return 4;
        !            88:                case CPU_SUBTYPE_POWERPC_603e:
        !            89:                        return 3;
        !            90:                case CPU_SUBTYPE_POWERPC_603:
        !            91:                        return 2;
        !            92:                case CPU_SUBTYPE_POWERPC_ALL:
        !            93:                        return 1;
        !            94:        }
        !            95:        /*
        !            96:         * If we get here it is because it is a cpusubtype we don't support (602 and
        !            97:         * 620) or new cpusubtype that was added since this code was written.  Both
        !            98:         * will be considered unacceptable.
        !            99:         */
        !           100:        return 0;
        !           101: }
        !           102: 
        !           103: int
        !           104: check_cpu_subtype (cpu_subtype)
        !           105: cpu_subtype_t  cpu_subtype;
        !           106: {
        !           107:        struct machine_slot *ms = &machine_slot[cpu_number()];
        !           108: 
        !           109:        if (cpu_subtype == ms->cpu_subtype)
        !           110:                return (TRUE);
        !           111: 
        !           112:        if (cpu_subtype == CPU_SUBTYPE_POWERPC_601)
        !           113:                return (FALSE);
        !           114: 
        !           115:        switch (cpu_subtype) {
        !           116:                case CPU_SUBTYPE_POWERPC_750:
        !           117:                case CPU_SUBTYPE_POWERPC_604e:
        !           118:                case CPU_SUBTYPE_POWERPC_604:
        !           119:                case CPU_SUBTYPE_POWERPC_603ev:
        !           120:                case CPU_SUBTYPE_POWERPC_603e:
        !           121:                case CPU_SUBTYPE_POWERPC_603:
        !           122:                case CPU_SUBTYPE_POWERPC_ALL:
        !           123:                        return (TRUE);
        !           124:        }
        !           125: 
        !           126:        return (FALSE);
        !           127: }
        !           128: 

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