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Annotation of kernel/machdep/i386/vm_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) 1992 NeXT Computer, Inc.
        !            27:  *
        !            28:  * Intel386 Family:    MD VM crud.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 18 May 1992 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: #import <sys/param.h>
        !            37: #import <sys/buf.h>
        !            38: #import <sys/errno.h>
        !            39: 
        !            40: #import <kern/thread.h>
        !            41: 
        !            42: #import <vm/vm_kern.h>
        !            43: 
        !            44: #import <machdep/i386/cpu_inline.h>
        !            45: 
        !            46: /*
        !            47:  * Move pages from one kernel virtual address to another.
        !            48:  * Both addresses are assumed to reside in the Sysmap,
        !            49:  * and size must be a multiple of the page size.
        !            50:  */
        !            51: pagemove(from, to, size)
        !            52:     register caddr_t from, to;
        !            53:     int size;
        !            54: {
        !            55:     register pt_entry_t *fpte, *tpte;
        !            56: 
        !            57:     if (size % I386_PGBYTES)
        !            58:        panic("pagemove");
        !            59: 
        !            60:     while (size > 0) {
        !            61:        fpte = pmap_pt_entry(kernel_pmap, (vm_offset_t)from);
        !            62:        tpte = pmap_pt_entry(kernel_pmap, (vm_offset_t)to);
        !            63:        *tpte++ = *fpte;
        !            64:        *fpte++ = (pt_entry_t) { 0 };
        !            65:        from += I386_PGBYTES;
        !            66:        to += I386_PGBYTES;
        !            67:        size -= I386_PGBYTES;
        !            68:     }
        !            69:     
        !            70:     flush_tlb();
        !            71: }
        !            72: 
        !            73: /* 
        !            74:  * kernacc - check kernel access to kernel memory.
        !            75:  *
        !            76:  */
        !            77: boolean_t
        !            78: kernacc(
        !            79:     vm_offset_t        base,
        !            80:     unsigned int       len,
        !            81:     int                        op
        !            82: )
        !            83: {
        !            84:     vm_offset_t                end = base + len;
        !            85:     pt_entry_t         *pte;
        !            86:     
        !            87:     base = trunc_page(base);
        !            88: 
        !            89:     while (base < end) {
        !            90:        pte = pmap_pt_entry(kernel_pmap, base);
        !            91:        if (pte == PT_ENTRY_NULL)
        !            92:            return (FALSE);
        !            93: 
        !            94:        if (!pte->valid)
        !            95:            return (FALSE);
        !            96:            
        !            97:        if (op == B_WRITE && pte->prot == PT_PROT_KR)
        !            98:            return (FALSE);
        !            99: 
        !           100:        base += PAGE_SIZE;
        !           101:     }   
        !           102: 
        !           103:     return (TRUE);
        !           104: }

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