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Annotation of kernel/machdep/i386/pmap_inline.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: /*
        !            26:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            27:  *
        !            28:  * Intel386 Family:    Inline expansions for pmap.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 9 April 1992 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Convert a physical address
        !            38:  * into an absolute page index.
        !            39:  */
        !            40: static inline
        !            41: unsigned int
        !            42: phys_to_pfn(
        !            43:     unsigned int       phys
        !            44: )
        !            45: {
        !            46:     union {
        !            47:        unsigned int    phys;
        !            48:        struct {
        !            49:            unsigned int                :12,
        !            50:                                pfn     :20;
        !            51:        }               fields;
        !            52:     } conv;
        !            53:     
        !            54:     conv.phys = phys;
        !            55:     
        !            56:     return (conv.fields.pfn);
        !            57: }
        !            58: 
        !            59: /*
        !            60:  * Return the address corresponding
        !            61:  * the an absolute physical page
        !            62:  * index.
        !            63:  */
        !            64: static inline
        !            65: unsigned int
        !            66: pfn_to_phys(
        !            67:     unsigned int       pfn
        !            68: )
        !            69: {
        !            70:     union {
        !            71:        unsigned int    phys;
        !            72:        struct {
        !            73:            unsigned int                :12,
        !            74:                                pfn     :20;
        !            75:        }               fields;
        !            76:     } conv;
        !            77:     
        !            78:     conv.phys = 0;
        !            79:     conv.fields.pfn = pfn;
        !            80:     
        !            81:     return (conv.phys);
        !            82: }
        !            83: 
        !            84: /*
        !            85:  * Return the page offset part
        !            86:  * of an address, virtual or
        !            87:  * physical.
        !            88:  */
        !            89: static inline
        !            90: unsigned int
        !            91: page_offset(
        !            92:     unsigned int       addr    /* XXX vm or phys */
        !            93: )
        !            94: {
        !            95:     union {
        !            96:        unsigned int    addr;
        !            97:        struct {
        !            98:            unsigned int        offset  :12,
        !            99:                                        :20;
        !           100:        }               fields;
        !           101:     } conv;
        !           102:     
        !           103:     conv.addr = addr;
        !           104:     
        !           105:     return (conv.fields.offset);
        !           106: }
        !           107: 
        !           108: /*
        !           109:  * Given a ptr to a page
        !           110:  * directory and a virtual
        !           111:  * address, return a ptr to
        !           112:  * the corresponding
        !           113:  * page directory entry.
        !           114:  */
        !           115: static inline
        !           116: pd_entry_t *
        !           117: pd_to_pd_entry(
        !           118:     pd_entry_t         p[],
        !           119:     vm_offset_t                v
        !           120: )
        !           121: {
        !           122:     union {
        !           123:        vm_offset_t     virt;
        !           124:        struct {
        !           125:            unsigned int                :12,
        !           126:                                        :10,
        !           127:                                index   :10;
        !           128:        }               fields;
        !           129:     } conv;
        !           130:     
        !           131:     conv.virt = v;
        !           132:     
        !           133:     return (&p[conv.fields.index]);
        !           134: }
        !           135: 
        !           136: /*
        !           137:  * Given a ptr to a page
        !           138:  * table and a virtual
        !           139:  * address, return a ptr to
        !           140:  * the corresponding
        !           141:  * page table entry.
        !           142:  */
        !           143: static inline
        !           144: pt_entry_t *
        !           145: pt_to_pt_entry(
        !           146:     pt_entry_t         p[],
        !           147:     vm_offset_t                v
        !           148: )
        !           149: {
        !           150:     union {
        !           151:        vm_offset_t     virt;
        !           152:        struct {
        !           153:            unsigned int                :12,
        !           154:                                index   :10,
        !           155:                                        :10;
        !           156:        }               fields;
        !           157:     } conv;
        !           158:     
        !           159:     conv.virt = v;
        !           160:     
        !           161:     return (&p[conv.fields.index]);
        !           162: }
        !           163: 
        !           164: /*
        !           165:  * Return the virtual address
        !           166:  * of the page table referenced
        !           167:  * by a page directory entry.
        !           168:  */
        !           169: static inline
        !           170: pt_entry_t *
        !           171: pd_entry_to_pt(
        !           172:     pd_entry_t         *p
        !           173: )
        !           174: {
        !           175:     return ((pt_entry_t *)(pfn_to_phys(p->pfn) +
        !           176:                                    VM_MIN_KERNEL_ADDRESS));
        !           177: }
        !           178: 
        !           179: /*
        !           180:  * Given  a ptr to a valid page
        !           181:  * directory entry and a virtual
        !           182:  * address, walk to the corresponding
        !           183:  * page table entry, and return a ptr
        !           184:  * to it.
        !           185:  */
        !           186: static inline
        !           187: pt_entry_t *
        !           188: pd_entry_to_pt_entry(
        !           189:     pd_entry_t         *p,
        !           190:     vm_offset_t                v
        !           191: )
        !           192: {
        !           193:     return (pt_to_pt_entry(pd_entry_to_pt(p), v));
        !           194: }

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