251 lines
6.4 KiB
C
251 lines
6.4 KiB
C
/* $OpenBSD: arm64_bus_space.c,v 1.8 2021/02/16 12:33:22 kettenis Exp $ */
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/*
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* Copyright (c) 2001-2003 Opsycon AB (www.opsycon.se / www.opsycon.com)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* Simple generic bus access primitives.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <uvm/uvm_extern.h>
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bus_space_t arm64_bs_tag = {
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.bus_base = 0ULL, // XXX
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.bus_private = NULL,
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._space_read_1 = generic_space_read_1,
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._space_write_1 = generic_space_write_1,
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._space_read_2 = generic_space_read_2,
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._space_write_2 = generic_space_write_2,
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._space_read_4 = generic_space_read_4,
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._space_write_4 = generic_space_write_4,
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._space_read_8 = generic_space_read_8,
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._space_write_8 = generic_space_write_8,
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._space_read_raw_2 = generic_space_read_raw_2,
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._space_write_raw_2 = generic_space_write_raw_2,
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._space_read_raw_4 = generic_space_read_raw_4,
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._space_write_raw_4 = generic_space_write_raw_4,
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._space_read_raw_8 = generic_space_read_raw_8,
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._space_write_raw_8 = generic_space_write_raw_8,
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._space_map = generic_space_map,
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._space_unmap = generic_space_unmap,
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._space_subregion = generic_space_region,
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._space_vaddr = generic_space_vaddr,
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._space_mmap = generic_space_mmap
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};
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bus_space_t *fdt_cons_bs_tag = &arm64_bs_tag;
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uint8_t
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generic_space_read_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o)
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{
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return *(volatile uint8_t *)(h + o);
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}
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uint16_t
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generic_space_read_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o)
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{
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return *(volatile uint16_t *)(h + o);
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}
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uint32_t
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generic_space_read_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o)
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{
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return *(volatile uint32_t *)(h + o);
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}
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uint64_t
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generic_space_read_8(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o)
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{
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return *(volatile uint64_t *)(h + o);
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}
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void
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generic_space_write_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
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uint8_t v)
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{
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*(volatile uint8_t *)(h + o) = v;
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}
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void
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generic_space_write_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
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uint16_t v)
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{
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*(volatile uint16_t *)(h + o) = v;
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}
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void
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generic_space_write_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
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uint32_t v)
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{
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*(volatile uint32_t *)(h + o) = v;
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}
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void
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generic_space_write_8(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
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uint64_t v)
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{
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*(volatile uint64_t *)(h + o) = v;
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}
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void
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generic_space_read_raw_2(bus_space_tag_t t, bus_space_handle_t h, bus_addr_t o,
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uint8_t *buf, bus_size_t len)
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{
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volatile uint16_t *addr = (volatile uint16_t *)(h + o);
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len >>= 1;
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while (len-- != 0) {
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*(uint16_t *)buf = *addr;
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buf += 2;
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}
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}
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void
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generic_space_write_raw_2(bus_space_tag_t t, bus_space_handle_t h, bus_addr_t o,
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const uint8_t *buf, bus_size_t len)
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{
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volatile uint16_t *addr = (volatile uint16_t *)(h + o);
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len >>= 1;
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while (len-- != 0) {
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*addr = *(uint16_t *)buf;
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buf += 2;
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}
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}
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void
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generic_space_read_raw_4(bus_space_tag_t t, bus_space_handle_t h, bus_addr_t o,
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uint8_t *buf, bus_size_t len)
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{
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volatile uint32_t *addr = (volatile uint32_t *)(h + o);
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len >>= 2;
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while (len-- != 0) {
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*(uint32_t *)buf = *addr;
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buf += 4;
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}
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}
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void
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generic_space_write_raw_4(bus_space_tag_t t, bus_space_handle_t h, bus_addr_t o,
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const uint8_t *buf, bus_size_t len)
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{
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volatile uint32_t *addr = (volatile uint32_t *)(h + o);
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len >>= 2;
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while (len-- != 0) {
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*addr = *(uint32_t *)buf;
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buf += 4;
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}
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}
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void
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generic_space_read_raw_8(bus_space_tag_t t, bus_space_handle_t h, bus_addr_t o,
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uint8_t *buf, bus_size_t len)
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{
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volatile uint64_t *addr = (volatile uint64_t *)(h + o);
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len >>= 3;
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while (len-- != 0) {
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*(uint64_t *)buf = *addr;
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buf += 8;
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}
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}
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void
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generic_space_write_raw_8(bus_space_tag_t t, bus_space_handle_t h, bus_addr_t o,
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const uint8_t *buf, bus_size_t len)
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{
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volatile uint64_t *addr = (volatile uint64_t *)(h + o);
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len >>= 3;
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while (len-- != 0) {
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*addr = *(uint64_t *)buf;
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buf += 8;
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}
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}
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int
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generic_space_map(bus_space_tag_t t, bus_addr_t offs, bus_size_t size,
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int flags, bus_space_handle_t *bshp)
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{
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u_long startpa, endpa, pa;
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vaddr_t va;
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int cache = PMAP_CACHE_DEV_NGNRNE;
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if (flags & BUS_SPACE_MAP_CACHEABLE)
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cache = PMAP_CACHE_WB;
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if (flags & BUS_SPACE_MAP_POSTED)
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cache = PMAP_CACHE_DEV_NGNRE;
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startpa = trunc_page(offs);
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endpa = round_page(offs + size);
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va = (vaddr_t)km_alloc(endpa - startpa, &kv_any, &kp_none, &kd_nowait);
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if (! va)
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return(ENOMEM);
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*bshp = (bus_space_handle_t)(va + (offs - startpa));
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for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
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pmap_kenter_cache(va, pa, PROT_READ | PROT_WRITE, cache);
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}
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pmap_update(pmap_kernel());
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return(0);
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}
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void
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generic_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
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{
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vaddr_t va, endva;
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va = trunc_page((vaddr_t)bsh);
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endva = round_page((vaddr_t)bsh + size);
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pmap_kremove(va, endva - va);
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pmap_update(pmap_kernel());
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km_free((void *)va, endva - va, &kv_any, &kp_none);
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}
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int
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generic_space_region(bus_space_tag_t t, bus_space_handle_t bsh,
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bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
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{
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*nbshp = bsh + offset;
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return 0;
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}
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void *
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generic_space_vaddr(bus_space_tag_t t, bus_space_handle_t h)
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{
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return (void *)h;
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}
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paddr_t
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generic_space_mmap(bus_space_tag_t t, bus_addr_t addr, off_t off,
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int prot, int flags)
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{
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return (addr + off);
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}
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