The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/devmap.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/sys/devmap.h 326823 2017-12-13 16:13:17Z pfg $
   29  */
   30 
   31 #ifndef _SYS_DEVMAP_H_
   32 #define _SYS_DEVMAP_H_
   33 
   34 #ifndef _KERNEL
   35 #error "no user-serviceable parts inside"
   36 #endif
   37 
   38 /*
   39  * This structure is used by MD code to describe static mappings of devices
   40  * which are established as part of bringing up the MMU early in the boot.
   41  */
   42 struct devmap_entry {
   43         vm_offset_t     pd_va;          /* virtual address */
   44         vm_paddr_t      pd_pa;          /* physical address */
   45         vm_size_t       pd_size;        /* size of region */
   46 };
   47 
   48 /*
   49  * Return the lowest KVA address used in any entry in the registered devmap
   50  * table.  This works with whatever table is registered, including the internal
   51  * table used by devmap_add_entry() if that routine was used. Platforms can
   52  * implement platform_lastaddr() by calling this if static device mappings are
   53  * their only use of high KVA space.
   54  */
   55 vm_offset_t devmap_lastaddr(void);
   56 
   57 /*
   58  * Automatically allocate KVA (from the top of the address space downwards) and
   59  * make static device mapping entries in an internal table.  The internal table
   60  * is automatically registered on the first call to this.
   61  */
   62 void devmap_add_entry(vm_paddr_t pa, vm_size_t sz);
   63 
   64 /*
   65  * Register a platform-local table to be bootstrapped by the generic
   66  * initarm() in arm/machdep.c.  This is used by newer code that allocates and
   67  * fills in its own local table but does not have its own initarm() routine.
   68  */
   69 void devmap_register_table(const struct devmap_entry * _table);
   70 
   71 /*
   72  * Establish mappings for all the entries in the table.  This is called
   73  * automatically from the common initarm() in arm/machdep.c, and also from the
   74  * custom initarm() routines in older code.  If the table pointer is NULL, this
   75  * will use the table installed previously by devmap_register_table().
   76  */
   77 void devmap_bootstrap(vm_offset_t _l1pt,
   78     const struct devmap_entry *_table);
   79 
   80 /*
   81  * Translate between virtual and physical addresses within a region that is
   82  * static-mapped by the devmap code.  If the given address range isn't
   83  * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND.
   84  * The latter implies that you can't vtop just the last byte of physical address
   85  * space.  This is not as limiting as it might sound, because even if a device
   86  * occupies the end of the physical address space, you're only prevented from
   87  * doing vtop for that single byte.  If you vtop a size bigger than 1 it works.
   88  */
   89 #define DEVMAP_PADDR_NOTFOUND   ((vm_paddr_t)(-1))
   90 
   91 void *     devmap_ptov(vm_paddr_t _pa, vm_size_t _sz);
   92 vm_paddr_t devmap_vtop(void * _va, vm_size_t _sz);
   93 
   94 /* Print the static mapping table; used for bootverbose output. */
   95 void devmap_print_table(void);
   96 
   97 #endif /* !_SYS_DEVMAP_H_ */

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