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Annotation of kernel/machdep/ppc/pmap_internals.h, 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: /* Things that don't need to be exported from pmap. Putting
        !            26:  * them here and not in pmap.h avoids major recompiles when
        !            27:  * modifying something either here or in proc_reg.h
        !            28:  */
        !            29: 
        !            30: #ifndef _PMAP_INTERNALS_H_
        !            31: #define _PMAP_INTERNALS_H_
        !            32: 
        !            33: /* #include <mach/vm_types.h> */
        !            34: #include <mach/machine/vm_types.h>
        !            35: #include <mach/vm_prot.h>
        !            36: #include <mach/vm_statistics.h>
        !            37: #include <kern/queue.h>
        !            38: #include <machdep/ppc/proc_reg.h>
        !            39: 
        !            40: /* Page table entries are stored in groups (PTEGS) in a hash table */
        !            41: 
        !            42: #if __PPC__
        !            43: #if _BIG_ENDIAN == 0
        !            44: error - bitfield structures are not checked for bit ordering in words
        !            45: #endif /* _BIG_ENDIAN */
        !            46: #endif /* __PPC__ */
        !            47: 
        !            48: /*
        !            49:  * Don't change these structures unless you change the assembly code in
        !            50:  * locore.s
        !            51:  */
        !            52: struct mapping {
        !            53:        queue_head_t    phys_link;      /* for mappings of a given PA */
        !            54: 
        !            55:        union {
        !            56:                unsigned int word;
        !            57:                struct {
        !            58:                        vm_offset_t     page:28;/* virtual page number */
        !            59:                        unsigned int    wired:1;  /* boolean */
        !            60:                        unsigned int    phys:1;   /* boolean */
        !            61:                        unsigned int    :0;
        !            62:                } bits;
        !            63:        } vm_info;
        !            64: 
        !            65:        pte_t           *pte;           /* pointer to pte in hash table */
        !            66:        struct pmap     *pmap;          /* pmap mapping belongs to */
        !            67: };
        !            68: 
        !            69: #define MAPPING_NULL   ((struct mapping *) 0)
        !            70: 
        !            71: struct phys_entry {
        !            72:        queue_head_t    phys_link;      /* head of mappings of a given PA */
        !            73:        pte1_t          pte1;           /* referenced/changed/wimg info */
        !            74: };
        !            75: 
        !            76: #define PHYS_NULL      ((struct phys_entry *)0)
        !            77: 
        !            78: /* Memory may be non-contiguous. This data structure contains info
        !            79:  * for mapping this non-contiguous space into the contiguous
        !            80:  * physical->virtual mapping tables. An array of this type is
        !            81:  * provided to the pmap system at bootstrap by ppc_vm_init.
        !            82:  *
        !            83:  * NB : regions must be in order in this structure.
        !            84:  */
        !            85: 
        !            86: typedef struct pmap_mem_region {
        !            87:        vm_offset_t start;      /* Address of base of region */
        !            88:        struct phys_entry *phys_table; /* base of region's table */
        !            89:        unsigned int end;       /* End address+1 */
        !            90: } pmap_mem_region_t;
        !            91: 
        !            92: /* MEM_REGION_MAX has a PowerMac dependancy - at least the value of
        !            93:  * kMaxRAMBanks in ppc/POWERMAC/nkinfo.h
        !            94:  */
        !            95: #define MEM_REGION_MAX 26
        !            96: 
        !            97: extern pmap_mem_region_t pmap_mem_regions[MEM_REGION_MAX];
        !            98: extern int          pmap_mem_regions_count;
        !            99: 
        !           100: /* keep track of free regions of physical memory so that we can offer
        !           101:  * them up via pmap_next_page later on
        !           102:  */
        !           103: 
        !           104: #define FREE_REGION_MAX 8
        !           105: extern pmap_mem_region_t free_regions[FREE_REGION_MAX];
        !           106: extern int          free_regions_count;
        !           107: 
        !           108: /* Prototypes */
        !           109: 
        !           110: struct phys_entry *pmap_find_physentry(vm_offset_t pa);
        !           111: 
        !           112: extern pte_t *pmap_pteg_overflow(pte_t *primary_hash, pte0_t primary_match,
        !           113:                                 pte_t *secondary_hash, pte0_t secondary_key);
        !           114: 
        !           115: #endif /* _PMAP_INTERNALS_H_ */

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