diff options
author | ian <ian@FreeBSD.org> | 2013-12-13 23:56:53 +0000 |
---|---|---|
committer | ian <ian@FreeBSD.org> | 2013-12-13 23:56:53 +0000 |
commit | eae48ec05ef90176b68b7b5c7ebf3e4c792448aa (patch) | |
tree | 95426e39c61df08e259d54ab1d73d5aefa98c198 /sys/arm/include/devmap.h | |
parent | 689fd5c39017daa19a00a6cce247ad10ba00c1e7 (diff) | |
download | FreeBSD-src-eae48ec05ef90176b68b7b5c7ebf3e4c792448aa.zip FreeBSD-src-eae48ec05ef90176b68b7b5c7ebf3e4c792448aa.tar.gz |
MFC r257648, r257649, r257660:
Begin reducing code duplication in arm pmap.c and pmap-v6.c by factoring
out common code related to mapping device memory into a new devmap.c file.
Remove the growing duplication of code that used pmap_devmap_find_pa() and
then did some math with the returned results to generate a virtual address,
and likewise in reverse to get a physical address. Now there are a pair
of functions, arm_devmap_vtop() and arm_devmap_ptov(), to do that. The
bus_space_map() implementations are rewritten in terms of these.
Move remaining code and data related to static device mapping into the
new devmap.[ch] files. Emphasize the MD nature of these things by using
the prefix arm_devmap_ on the function and type names (already a few of
these things found their way into MI code, hopefully it will be harder to
do by accident in the future).
Diffstat (limited to 'sys/arm/include/devmap.h')
-rw-r--r-- | sys/arm/include/devmap.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/sys/arm/include/devmap.h b/sys/arm/include/devmap.h new file mode 100644 index 0000000..ee16b67 --- /dev/null +++ b/sys/arm/include/devmap.h @@ -0,0 +1,73 @@ +/*- + * Copyright (c) 2013 Ian Lepore <ian@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _MACHINE_DEVMAP_H_ +#define _MACHINE_DEVMAP_H_ + +/* + * This structure is used by MD code to describe static mappings of devices + * which are established as part of bringing up the MMU early in the boot. + */ +struct arm_devmap_entry { + vm_offset_t pd_va; /* virtual address */ + vm_paddr_t pd_pa; /* physical address */ + vm_size_t pd_size; /* size of region */ + vm_prot_t pd_prot; /* protection code */ + int pd_cache; /* cache attributes */ +}; + +/* + * Register a platform-local table to be bootstrapped by the generic + * initarm() in arm/machdep.c. This is used by newer code that allocates and + * fills in its own local table but does not have its own initarm() routine. + */ +void arm_devmap_register_table(const struct arm_devmap_entry * _table); + +/* + * Directly process a table; called from initarm() of older platforms that don't + * use the generic initarm() in arm/machdep.c. If the table pointer is NULL, + * this will use the table installed previously by arm_devmap_register_table(). + */ +void arm_devmap_bootstrap(vm_offset_t _l1pt, + const struct arm_devmap_entry *_table); + +/* + * Routines to translate between virtual and physical addresses within a region + * that is static-mapped by the devmap code. If the given address range isn't + * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND. + * The latter implies that you can't vtop just the last byte of physical address + * space. This is not as limiting as it might sound, because even if a device + * occupies the end of the physical address space, you're only prevented from + * doing vtop for that single byte. If you vtop a size bigger than 1 it works. + */ +#define DEVMAP_PADDR_NOTFOUND ((vm_paddr_t)(-1)) + +void * arm_devmap_ptov(vm_paddr_t _pa, vm_size_t _sz); +vm_paddr_t arm_devmap_vtop(void * _va, vm_size_t _sz); + +#endif |