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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS_DEVMAP_H_
#define _SYS_DEVMAP_H_
#ifndef _KERNEL
#error "no user-serviceable parts inside"
#endif
/*
* This structure is used by MD code to describe static mappings of devices
* which are established as part of bringing up the MMU early in the boot.
*/
struct devmap_entry {
vm_offset_t pd_va; /* virtual address */
vm_paddr_t pd_pa; /* physical address */
vm_size_t pd_size; /* size of region */
};
/*
* Return the lowest KVA address used in any entry in the registered devmap
* table. This works with whatever table is registered, including the internal
* table used by devmap_add_entry() if that routine was used. Platforms can
* implement platform_lastaddr() by calling this if static device mappings are
* their only use of high KVA space.
*/
vm_offset_t devmap_lastaddr(void);
/*
* Automatically allocate KVA (from the top of the address space downwards) and
* make static device mapping entries in an internal table. The internal table
* is automatically registered on the first call to this.
*/
void devmap_add_entry(vm_paddr_t pa, vm_size_t sz);
/*
* Register a platform-local table to be bootstrapped by the generic
* platform-specific init function in <ARCH>/machdep.c. This is used by newer
* code that allocates and fills in its own local table but does not have its
* own platform-specific init routine.
*/
void devmap_register_table(const struct devmap_entry * _table);
/*
* Establish mappings for all the entries in the table. This is called
* automatically from the common platform-specific init function in
* <ARCH>/machdep.c, and also from the custom platform-specific init routines
* in older code. If the table pointer is NULL, this will use the table
* installed previously by devmap_register_table().
*/
void devmap_bootstrap(vm_offset_t _l1pt,
const struct devmap_entry *_table);
/*
* Translate between virtual and physical addresses within a region that is
* static-mapped by the devmap code. If the given address range isn't
* static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND.
* The latter implies that you can't vtop just the last byte of physical address
* space. This is not as limiting as it might sound, because even if a device
* occupies the end of the physical address space, you're only prevented from
* doing vtop for that single byte. If you vtop a size bigger than 1 it works.
*/
#define DEVMAP_PADDR_NOTFOUND ((vm_paddr_t)(-1))
void * devmap_ptov(vm_paddr_t _pa, vm_size_t _sz);
vm_paddr_t devmap_vtop(void * _va, vm_size_t _sz);
/* Print the static mapping table; used for bootverbose output. */
void devmap_print_table(void);
#endif /* !_SYS_DEVMAP_H_ */
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