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