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/arm/include/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/10.2/sys/arm/include/devmap.h 266086 2014-05-14 20:17:31Z ian $
   27  */
   28 
   29 #ifndef _MACHINE_DEVMAP_H_
   30 #define _MACHINE_DEVMAP_H_
   31 
   32 /*
   33  * This structure is used by MD code to describe static mappings of devices
   34  * which are established as part of bringing up the MMU early in the boot.
   35  */
   36 struct arm_devmap_entry {
   37         vm_offset_t     pd_va;          /* virtual address */
   38         vm_paddr_t      pd_pa;          /* physical address */
   39         vm_size_t       pd_size;        /* size of region */
   40         vm_prot_t       pd_prot;        /* protection code */
   41         int             pd_cache;       /* cache attributes */
   42 };
   43 
   44 /*
   45  * Return the lowest KVA address used in any entry in the registered devmap
   46  * table.  This works with whatever table is registered, including the internal
   47  * table used by arm_devmap_add_entry() if that routine was used. Platforms can
   48  * implement initarm_lastaddr() by calling this if static device mappings are
   49  * their only use of high KVA space.
   50  */
   51 vm_offset_t arm_devmap_lastaddr(void);
   52 
   53 /*
   54  * Automatically allocate KVA (from the top of the address space downwards) and
   55  * make static device mapping entries in an internal table.  The internal table
   56  * is automatically registered on the first call to this.
   57  */
   58 void arm_devmap_add_entry(vm_paddr_t pa, vm_size_t sz);
   59 
   60 /*
   61  * Register a platform-local table to be bootstrapped by the generic
   62  * initarm() in arm/machdep.c.  This is used by newer code that allocates and
   63  * fills in its own local table but does not have its own initarm() routine.
   64  */
   65 void arm_devmap_register_table(const struct arm_devmap_entry * _table);
   66 
   67 /*
   68  * Establish mappings for all the entries in the table.  This is called
   69  * automatically from the common initarm() in arm/machdep.c, and also from the
   70  * custom initarm() routines in older code.  If the table pointer is NULL, this
   71  * will use the table installed previously by arm_devmap_register_table().
   72  */
   73 void arm_devmap_bootstrap(vm_offset_t _l1pt, 
   74     const struct arm_devmap_entry *_table);
   75 
   76 /*
   77  * Translate between virtual and physical addresses within a region that is
   78  * static-mapped by the devmap code.  If the given address range isn't
   79  * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND.
   80  * The latter implies that you can't vtop just the last byte of physical address
   81  * space.  This is not as limiting as it might sound, because even if a device
   82  * occupies the end of the physical address space, you're only prevented from
   83  * doing vtop for that single byte.  If you vtop a size bigger than 1 it works.
   84  */
   85 #define DEVMAP_PADDR_NOTFOUND   ((vm_paddr_t)(-1))
   86 
   87 void *     arm_devmap_ptov(vm_paddr_t _pa, vm_size_t _sz);
   88 vm_paddr_t arm_devmap_vtop(void * _va, vm_size_t _sz);
   89 
   90 /* Print the static mapping table; used for bootverbose output. */
   91 void arm_devmap_print_table(void);
   92 
   93 #endif

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