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Annotation of kernel/machdep/ppc/pmap_internals.h, revision 1.1.1.1

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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