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Annotation of kernel/machdep/i386/vm_machdep.c, 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: /*
                     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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