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Annotation of XNU/osfmk/i386/io_map.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  * @OSF_COPYRIGHT@
                     24:  */
                     25: /* 
                     26:  * Mach Operating System
                     27:  * Copyright (c) 1991,1990 Carnegie Mellon University
                     28:  * All Rights Reserved.
                     29:  * 
                     30:  * Permission to use, copy, modify and distribute this software and its
                     31:  * documentation is hereby granted, provided that both the copyright
                     32:  * notice and this permission notice appear in all copies of the
                     33:  * software, derivative works or modified versions, and any portions
                     34:  * thereof, and that both notices appear in supporting documentation.
                     35:  * 
                     36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     39:  * 
                     40:  * Carnegie Mellon requests users of this software to return to
                     41:  * 
                     42:  *  Software Distribution Coordinator  or  [email protected]
                     43:  *  School of Computer Science
                     44:  *  Carnegie Mellon University
                     45:  *  Pittsburgh PA 15213-3890
                     46:  * 
                     47:  * any improvements or extensions that they make and grant Carnegie Mellon
                     48:  * the rights to redistribute these changes.
                     49:  */
                     50: /*
                     51:  */
                     52: 
                     53: #include <mach/vm_param.h>
                     54: #include <vm/vm_kern.h>
                     55: #include <vm/vm_map.h>
                     56: #include <i386/pmap.h>
                     57: #include <i386/io_map_entries.h>
                     58: 
                     59: extern vm_offset_t     virtual_avail;
                     60: 
                     61: /*
                     62:  * Allocate and map memory for devices that may need to be mapped before
                     63:  * Mach VM is running.
                     64:  */
                     65: vm_offset_t
                     66: io_map(phys_addr, size)
                     67:        vm_offset_t     phys_addr;
                     68:        vm_size_t       size;
                     69: {
                     70:        vm_offset_t     start;
                     71: 
                     72:        if (kernel_map == VM_MAP_NULL) {
                     73:            /*
                     74:             * VM is not initialized.  Grab memory.
                     75:             */
                     76:            start = virtual_avail;
                     77:            virtual_avail += round_page(size);
                     78:        }
                     79:        else {
                     80:            (void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
                     81:        }
                     82:        (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
                     83:                        VM_PROT_READ|VM_PROT_WRITE);
                     84:        return (start);
                     85: }

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