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Annotation of XNU/osfmk/ppc/mem.c, revision 1.1

1.1     ! root        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: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: 
        !            26: /* A marvelous selection of support routines for virtual memory */
        !            27: 
        !            28: #include <cpus.h>
        !            29: #include <debug.h>
        !            30: #include <mach_kdb.h>
        !            31: #include <mach_vm_debug.h>
        !            32: 
        !            33: #include <kern/cpu_number.h>
        !            34: #include <kern/misc_protos.h>
        !            35: #include <kern/assert.h>
        !            36: #include <ppc/misc_protos.h>
        !            37: #include <ppc/mem.h>
        !            38: #include <ppc/pmap_internals.h>                /* For pmap_pteg_overflow */
        !            39: 
        !            40: /* These refer to physical addresses and are set and referenced elsewhere */
        !            41: 
        !            42: unsigned int hash_table_base;
        !            43: unsigned int hash_table_size;
        !            44: 
        !            45: unsigned int hash_function_mask;
        !            46: 
        !            47: struct shadowBAT shadow_BAT;
        !            48: 
        !            49: /* gather statistics about hash table usage */
        !            50: 
        !            51: #if    DEBUG
        !            52: #define MEM_STATS 1
        !            53: #else
        !            54: #define MEM_STATS 0
        !            55: #endif /* DEBUG */
        !            56: 
        !            57: #if MEM_STATS
        !            58: /* hash table usage information */
        !            59: struct hash_table_stats {
        !            60:        int find_pte_in_pteg_calls;
        !            61:        int find_pte_in_pteg_not_found;
        !            62:        int find_pte_in_pteg_location[8];
        !            63:        struct find_or_alloc_calls {
        !            64:                int found_primary;
        !            65:                int found_secondary;
        !            66:                int alloc_primary;
        !            67:                int alloc_secondary;
        !            68:                int overflow;
        !            69:                int not_found;
        !            70:        } find_or_alloc_calls[2];
        !            71:        
        !            72: } hash_table_stats[NCPUS];
        !            73: 
        !            74: #define INC_STAT(LOC) \
        !            75:        hash_table_stats[cpu_number()].find_pte_in_pteg_location[LOC]++
        !            76: 
        !            77: #else  /* MEM_STATS */
        !            78: #define INC_STAT(LOC)
        !            79: #endif /* MEM_STATS */
        !            80: 
        !            81: /* Set up the machine registers for the given hash table.
        !            82:  * The table has already been zeroed.
        !            83:  */
        !            84: void hash_table_init(unsigned int base, unsigned int size)
        !            85: {
        !            86:        sync();                                 /* SYNC: it's not just the law, it's a good idea... */
        !            87:        mtsdr1(hash_table_base | ((size-1)>>16));       /* Slam the SDR1 with the has table address */
        !            88:        sync();                                 /* SYNC: it's not just the law, it's a good idea... */
        !            89:        isync();
        !            90: }
        !            91: 

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