/*
* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_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,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @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_xnu.h>
#include <vm/vm_map_xnu.h>
#include <i386/pmap.h>
#include <san/kasan.h>
extern vm_offset_t virtual_avail;
#define IO_MAP_SIZE (32ul << 20)
__startup_data static struct mach_vm_range io_range;
static SECURITY_READ_ONLY_LATE(vm_map_t) io_submap;
KMEM_RANGE_REGISTER_STATIC(io_submap, &io_range, IO_MAP_SIZE);
__startup_func
static void
io_map_init(void)
{
vm_map_will_allocate_early_map(&io_submap);
io_submap = kmem_suballoc(kernel_map, &io_range.min_address, IO_MAP_SIZE,
VM_MAP_CREATE_NEVER_FAULTS | VM_MAP_CREATE_DISABLE_HOLELIST,
VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE, KMS_PERMANENT | KMS_NOFAIL,
VM_KERN_MEMORY_IOKIT).kmr_submap;
}
STARTUP(KMEM, STARTUP_RANK_LAST, io_map_init);
/*
* Allocate and map memory for devices that may need to be mapped before
* Mach VM is running.
*/
vm_offset_t
io_map(
vm_map_offset_t phys_addr,
vm_size_t size,
unsigned int flags,
vm_prot_t prot,
bool unmappable)
{
vm_offset_t start_offset = phys_addr - trunc_page(phys_addr);
vm_offset_t alloc_size = round_page(size + start_offset);
vm_offset_t start;
phys_addr = trunc_page(phys_addr);
if (startup_phase < STARTUP_SUB_KMEM) {
/*
* VM is not initialized. Grab memory.
*/
start = virtual_avail;
virtual_avail += round_page(size);
pmap_map_bd(start, phys_addr, phys_addr + alloc_size, prot, flags);
#if KASAN
kasan_notify_address(start, size);
#endif
} else {
kma_flags_t kmaflags = KMA_NOFAIL | KMA_PAGEABLE;
if (unmappable) {
kmaflags |= KMA_DATA;
} else {
kmaflags |= KMA_PERMANENT;
}
kmem_alloc(unmappable ? kernel_map : io_submap,
&start, alloc_size, kmaflags, VM_KERN_MEMORY_IOKIT);
pmap_map(start, phys_addr, phys_addr + alloc_size, prot, flags);
}
return start + start_offset;
}