1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 29 #ifndef _SYS_DEVMAP_H_ 30 #define _SYS_DEVMAP_H_ 31 32 #ifndef _KERNEL 33 #error "no user-serviceable parts inside" 34 #endif 35 36 #ifdef __HAVE_STATIC_DEVMAP 37 /* 38 * This structure is used by MD code to describe static mappings of devices 39 * which are established as part of bringing up the MMU early in the boot. 40 */ 41 struct devmap_entry { 42 vm_offset_t pd_va; /* virtual address */ 43 vm_paddr_t pd_pa; /* physical address */ 44 vm_size_t pd_size; /* size of region */ 45 }; 46 47 /* 48 * Return the lowest KVA address used in any entry in the registered devmap 49 * table. This works with whatever table is registered, including the internal 50 * table used by devmap_add_entry() if that routine was used. Platforms can 51 * implement platform_lastaddr() by calling this if static device mappings are 52 * their only use of high KVA space. 53 */ 54 vm_offset_t devmap_lastaddr(void); 55 56 /* 57 * Automatically allocate KVA (from the top of the address space downwards) and 58 * make static device mapping entries in an internal table. The internal table 59 * is automatically registered on the first call to this. 60 */ 61 void devmap_add_entry(vm_paddr_t pa, vm_size_t sz); 62 63 /* 64 * Register a platform-local table to be bootstrapped by the generic 65 * platform-specific init function in <ARCH>/machdep.c. This is used by newer 66 * code that allocates and fills in its own local table but does not have its 67 * own platform-specific init 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 platform-specific init function in 74 * <ARCH>/machdep.c, and also from the custom platform-specific init routines 75 * in older code. This function only has an effect when a table was installed 76 * previously by devmap_register_table(). 77 */ 78 void devmap_bootstrap(void); 79 80 /* Print the static mapping table; used for bootverbose output. */ 81 void devmap_print_table(void); 82 #endif 83 84 #endif /* !_SYS_DEVMAP_H_ */ 85