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  * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/11.1/sys/sys/devmap.h 298627 2016-04-26 11:53:37Z br $
   27  */
   28 
   29 #ifndef _SYS_DEVMAP_H_
   30 #define _SYS_DEVMAP_H_
   31 
   32 #ifndef _KERNEL
   33 #error "no user-servicable parts inside"
   34 #endif
   35 
   36 /*
   37  * This structure is used by MD code to describe static mappings of devices
   38  * which are established as part of bringing up the MMU early in the boot.
   39  */
   40 struct devmap_entry {
   41         vm_offset_t     pd_va;          /* virtual address */
   42         vm_paddr_t      pd_pa;          /* physical address */
   43         vm_size_t       pd_size;        /* size of region */
   44 };
   45 
   46 /*
   47  * Return the lowest KVA address used in any entry in the registered devmap
   48  * table.  This works with whatever table is registered, including the internal
   49  * table used by devmap_add_entry() if that routine was used. Platforms can
   50  * implement platform_lastaddr() by calling this if static device mappings are
   51  * their only use of high KVA space.
   52  */
   53 vm_offset_t devmap_lastaddr(void);
   54 
   55 /*
   56  * Automatically allocate KVA (from the top of the address space downwards) and
   57  * make static device mapping entries in an internal table.  The internal table
   58  * is automatically registered on the first call to this.
   59  */
   60 void devmap_add_entry(vm_paddr_t pa, vm_size_t sz);
   61 
   62 /*
   63  * Register a platform-local table to be bootstrapped by the generic
   64  * initarm() in arm/machdep.c.  This is used by newer code that allocates and
   65  * fills in its own local table but does not have its own initarm() routine.
   66  */
   67 void devmap_register_table(const struct devmap_entry * _table);
   68 
   69 /*
   70  * Establish mappings for all the entries in the table.  This is called
   71  * automatically from the common initarm() in arm/machdep.c, and also from the
   72  * custom initarm() routines in older code.  If the table pointer is NULL, this
   73  * will use the table installed previously by devmap_register_table().
   74  */
   75 void devmap_bootstrap(vm_offset_t _l1pt,
   76     const struct devmap_entry *_table);
   77 
   78 /*
   79  * Translate between virtual and physical addresses within a region that is
   80  * static-mapped by the devmap code.  If the given address range isn't
   81  * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND.
   82  * The latter implies that you can't vtop just the last byte of physical address
   83  * space.  This is not as limiting as it might sound, because even if a device
   84  * occupies the end of the physical address space, you're only prevented from
   85  * doing vtop for that single byte.  If you vtop a size bigger than 1 it works.
   86  */
   87 #define DEVMAP_PADDR_NOTFOUND   ((vm_paddr_t)(-1))
   88 
   89 void *     devmap_ptov(vm_paddr_t _pa, vm_size_t _sz);
   90 vm_paddr_t devmap_vtop(void * _va, vm_size_t _sz);
   91 
   92 /* Print the static mapping table; used for bootverbose output. */
   93 void devmap_print_table(void);
   94 
   95 #endif /* !_SYS_DEVMAP_H_ */

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