xnu-792.12.6.tar.gz

[apple/xnu.git] / osfmk / i386 / io_map.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The Original Code and all software distributed under the License are 
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
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/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */

#include <mach/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <i386/pmap.h>
#include <i386/io_map_entries.h>

extern vm_offset_t	virtual_avail;

/*
 * Allocate and map memory for devices that may need to be mapped before
 * Mach VM is running.
 */
vm_offset_t
io_map(phys_addr, size)
	vm_offset_t	phys_addr;
	vm_size_t	size;
{
	vm_offset_t	start;

	if (kernel_map == VM_MAP_NULL) {
	    /*
	     * VM is not initialized.  Grab memory.
	     */
	    start = virtual_avail;
	    virtual_avail += round_page(size);

	    (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
			       VM_PROT_READ|VM_PROT_WRITE);
	}
	else {
	    (void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
	    (void) pmap_map(start, phys_addr, phys_addr + round_page(size),
			    VM_PROT_READ|VM_PROT_WRITE);
	}
	return (start);
}

/* just wrap this since io_map handles it */

vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size)
{
  return (io_map(phys_addr, size));
}