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