devmap.h revision 259364
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: stable/10/sys/arm/include/devmap.h 259364 2013-12-13 23:56:53Z 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 */ 36struct 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 * Register a platform-local table to be bootstrapped by the generic 46 * initarm() in arm/machdep.c. This is used by newer code that allocates and 47 * fills in its own local table but does not have its own initarm() routine. 48 */ 49void arm_devmap_register_table(const struct arm_devmap_entry * _table); 50 51/* 52 * Directly process a table; called from initarm() of older platforms that don't 53 * use the generic initarm() in arm/machdep.c. If the table pointer is NULL, 54 * this will use the table installed previously by arm_devmap_register_table(). 55 */ 56void arm_devmap_bootstrap(vm_offset_t _l1pt, 57 const struct arm_devmap_entry *_table); 58 59/* 60 * Routines to translate between virtual and physical addresses within a region 61 * that is static-mapped by the devmap code. If the given address range isn't 62 * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND. 63 * The latter implies that you can't vtop just the last byte of physical address 64 * space. This is not as limiting as it might sound, because even if a device 65 * occupies the end of the physical address space, you're only prevented from 66 * doing vtop for that single byte. If you vtop a size bigger than 1 it works. 67 */ 68#define DEVMAP_PADDR_NOTFOUND ((vm_paddr_t)(-1)) 69 70void * arm_devmap_ptov(vm_paddr_t _pa, vm_size_t _sz); 71vm_paddr_t arm_devmap_vtop(void * _va, vm_size_t _sz); 72 73#endif 74