1059 lines
24 KiB
C
1059 lines
24 KiB
C
/* $NetBSD: bus_machdep.c,v 1.14 2001/11/17 19:32:03 kleink Exp $ */
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/*-
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* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
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* Simulation Facility, NASA Ames Research Center.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: bus_machdep.c,v 1.14 2001/11/17 19:32:03 kleink Exp $");
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#include "opt_largepages.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/extent.h>
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#include <sys/proc.h>
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#include <uvm/uvm_extern.h>
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#define _I386_BUS_DMA_PRIVATE
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#include <machine/bus.h>
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#include <dev/isa/isareg.h>
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#include <machine/isa_machdep.h>
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/*
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* Extent maps to manage I/O and memory space. Allocate
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* storage for 8 regions in each, initially. Later, ioport_malloc_safe
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* will indicate that it's safe to use malloc() to dynamically allocate
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* region descriptors.
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*
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* N.B. At least two regions are _always_ allocated from the iomem
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* extent map; (0 -> ISA hole) and (end of ISA hole -> end of RAM).
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*
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* The extent maps are not static! Machine-dependent ISA and EISA
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* routines need access to them for bus address space allocation.
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*/
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static long ioport_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8) / sizeof(long)];
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static long iomem_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8) / sizeof(long)];
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struct extent *ioport_ex;
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struct extent *iomem_ex;
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static int ioport_malloc_safe;
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int i386_mem_add_mapping __P((bus_addr_t, bus_size_t,
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int, bus_space_handle_t *));
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int _bus_dmamap_load_buffer __P((bus_dma_tag_t, bus_dmamap_t, void *,
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bus_size_t, struct proc *, int, paddr_t *, int *, int));
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void
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i386_bus_space_init()
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{
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/*
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* Initialize the I/O port and I/O mem extent maps.
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* Note: we don't have to check the return value since
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* creation of a fixed extent map will never fail (since
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* descriptor storage has already been allocated).
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*
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* N.B. The iomem extent manages _all_ physical addresses
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* on the machine. When the amount of RAM is found, the two
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* extents of RAM are allocated from the map (0 -> ISA hole
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* and end of ISA hole -> end of RAM).
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*/
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ioport_ex = extent_create("ioport", 0x0, 0xffff, M_DEVBUF,
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(caddr_t)ioport_ex_storage, sizeof(ioport_ex_storage),
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EX_NOCOALESCE|EX_NOWAIT);
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iomem_ex = extent_create("iomem", 0x0, 0xffffffff, M_DEVBUF,
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(caddr_t)iomem_ex_storage, sizeof(iomem_ex_storage),
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EX_NOCOALESCE|EX_NOWAIT);
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}
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void
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i386_bus_space_mallocok()
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{
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ioport_malloc_safe = 1;
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}
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int
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i386_memio_map(t, bpa, size, flags, bshp)
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bus_space_tag_t t;
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bus_addr_t bpa;
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bus_size_t size;
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int flags;
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bus_space_handle_t *bshp;
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{
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int error;
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struct extent *ex;
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/*
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* Pick the appropriate extent map.
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*/
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if (t == I386_BUS_SPACE_IO) {
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if (flags & BUS_SPACE_MAP_LINEAR)
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return (EOPNOTSUPP);
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ex = ioport_ex;
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} else if (t == I386_BUS_SPACE_MEM)
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ex = iomem_ex;
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else
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panic("i386_memio_map: bad bus space tag");
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/*
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* Before we go any further, let's make sure that this
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* region is available.
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*/
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error = extent_alloc_region(ex, bpa, size,
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EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0));
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if (error)
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return (error);
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/*
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* For I/O space, that's all she wrote.
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*/
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if (t == I386_BUS_SPACE_IO) {
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*bshp = bpa;
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return (0);
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}
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if (bpa >= IOM_BEGIN && (bpa + size) <= IOM_END) {
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*bshp = (bus_space_handle_t)ISA_HOLE_VADDR(bpa);
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return(0);
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}
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/*
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* For memory space, map the bus physical address to
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* a kernel virtual address.
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*/
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error = i386_mem_add_mapping(bpa, size,
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(flags & BUS_SPACE_MAP_CACHEABLE) != 0, bshp);
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if (error) {
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if (extent_free(ex, bpa, size, EX_NOWAIT |
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(ioport_malloc_safe ? EX_MALLOCOK : 0))) {
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printf("i386_memio_map: pa 0x%lx, size 0x%lx\n",
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bpa, size);
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printf("i386_memio_map: can't free region\n");
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}
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}
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return (error);
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}
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int
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_i386_memio_map(t, bpa, size, flags, bshp)
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bus_space_tag_t t;
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bus_addr_t bpa;
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bus_size_t size;
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int flags;
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bus_space_handle_t *bshp;
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{
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/*
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* For I/O space, just fill in the handle.
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*/
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if (t == I386_BUS_SPACE_IO) {
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if (flags & BUS_SPACE_MAP_LINEAR)
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return (EOPNOTSUPP);
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*bshp = bpa;
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return (0);
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}
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/*
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* For memory space, map the bus physical address to
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* a kernel virtual address.
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*/
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return (i386_mem_add_mapping(bpa, size,
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(flags & BUS_SPACE_MAP_CACHEABLE) != 0, bshp));
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}
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int
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i386_memio_alloc(t, rstart, rend, size, alignment, boundary, flags,
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bpap, bshp)
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bus_space_tag_t t;
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bus_addr_t rstart, rend;
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bus_size_t size, alignment, boundary;
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int flags;
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bus_addr_t *bpap;
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bus_space_handle_t *bshp;
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{
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struct extent *ex;
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u_long bpa;
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int error;
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/*
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* Pick the appropriate extent map.
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*/
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if (t == I386_BUS_SPACE_IO) {
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if (flags & BUS_SPACE_MAP_LINEAR)
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return (EOPNOTSUPP);
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ex = ioport_ex;
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} else if (t == I386_BUS_SPACE_MEM)
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ex = iomem_ex;
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else
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panic("i386_memio_alloc: bad bus space tag");
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/*
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* Sanity check the allocation against the extent's boundaries.
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*/
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if (rstart < ex->ex_start || rend > ex->ex_end)
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panic("i386_memio_alloc: bad region start/end");
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/*
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* Do the requested allocation.
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*/
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error = extent_alloc_subregion(ex, rstart, rend, size, alignment,
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boundary,
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EX_FAST | EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0),
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&bpa);
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if (error)
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return (error);
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/*
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* For I/O space, that's all she wrote.
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*/
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if (t == I386_BUS_SPACE_IO) {
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*bshp = *bpap = bpa;
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return (0);
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}
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/*
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* For memory space, map the bus physical address to
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* a kernel virtual address.
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*/
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error = i386_mem_add_mapping(bpa, size,
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(flags & BUS_SPACE_MAP_CACHEABLE) != 0, bshp);
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if (error) {
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if (extent_free(iomem_ex, bpa, size, EX_NOWAIT |
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(ioport_malloc_safe ? EX_MALLOCOK : 0))) {
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printf("i386_memio_alloc: pa 0x%lx, size 0x%lx\n",
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bpa, size);
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printf("i386_memio_alloc: can't free region\n");
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}
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}
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*bpap = bpa;
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return (error);
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}
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int
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i386_mem_add_mapping(bpa, size, cacheable, bshp)
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bus_addr_t bpa;
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bus_size_t size;
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int cacheable;
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bus_space_handle_t *bshp;
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{
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u_long pa, endpa;
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vaddr_t va;
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pt_entry_t *pte;
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pa = i386_trunc_page(bpa);
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endpa = i386_round_page(bpa + size);
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#ifdef DIAGNOSTIC
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if (endpa <= pa)
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panic("i386_mem_add_mapping: overflow");
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#endif
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va = uvm_km_valloc(kernel_map, endpa - pa);
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if (va == 0)
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return (ENOMEM);
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*bshp = (bus_space_handle_t)(va + (bpa & PGOFSET));
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for (; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
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pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE);
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/*
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* PG_N doesn't exist on 386's, so we assume that
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* the mainboard has wired up device space non-cacheable
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* on those machines.
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*/
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if (cpu_class != CPUCLASS_386) {
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pte = kvtopte(va);
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if (cacheable)
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*pte &= ~PG_N;
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else
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*pte |= PG_N;
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#ifdef LARGEPAGES
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if (*pte & PG_PS)
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pmap_update_pg(va & PG_LGFRAME);
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else
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#endif
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pmap_update_pg(va);
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}
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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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/*
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* void _i386_memio_unmap(bus_space_tag bst, bus_space_handle bsh,
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* bus_size_t size, bus_addr_t *adrp)
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*
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* This function unmaps memory- or io-space mapped by the function
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* _i386_memio_map(). This function works nearly as same as
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* i386_memio_unmap(), but this function does not ask kernel
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* built-in extents and returns physical address of the bus space,
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* for the convenience of the extra extent manager.
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*/
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void
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_i386_memio_unmap(t, bsh, size, adrp)
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bus_space_tag_t t;
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bus_space_handle_t bsh;
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bus_size_t size;
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bus_addr_t *adrp;
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{
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u_long va, endva;
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bus_addr_t bpa;
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/*
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* Find the correct extent and bus physical address.
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*/
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if (t == I386_BUS_SPACE_IO) {
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bpa = bsh;
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} else if (t == I386_BUS_SPACE_MEM) {
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if (bsh >= atdevbase && (bsh + size) <= (atdevbase + IOM_SIZE)) {
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bpa = (bus_addr_t)ISA_PHYSADDR(bsh);
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} else {
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va = i386_trunc_page(bsh);
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endva = i386_round_page(bsh + size);
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#ifdef DIAGNOSTIC
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if (endva <= va) {
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panic("_i386_memio_unmap: overflow");
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}
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#endif
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#if __NetBSD_Version__ > 104050000
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if (pmap_extract(pmap_kernel(), va, &bpa) == FALSE) {
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panic("_i386_memio_unmap:"
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"i386/rbus_machdep.c wrong virtual address");
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}
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bpa += (bsh & PGOFSET);
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#else
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bpa = pmap_extract(pmap_kernel(), va) + (bsh & PGOFSET);
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#endif
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/*
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* Free the kernel virtual mapping.
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*/
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uvm_km_free(kernel_map, va, endva - va);
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}
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} else {
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panic("_i386_memio_unmap: bad bus space tag");
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}
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if (adrp != NULL) {
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*adrp = bpa;
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}
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}
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void
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i386_memio_unmap(t, bsh, size)
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bus_space_tag_t t;
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bus_space_handle_t bsh;
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bus_size_t size;
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{
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struct extent *ex;
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u_long va, endva;
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bus_addr_t bpa;
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/*
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* Find the correct extent and bus physical address.
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*/
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if (t == I386_BUS_SPACE_IO) {
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ex = ioport_ex;
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bpa = bsh;
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} else if (t == I386_BUS_SPACE_MEM) {
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ex = iomem_ex;
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if (bsh >= atdevbase &&
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(bsh + size) <= (atdevbase + IOM_SIZE)) {
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bpa = (bus_addr_t)ISA_PHYSADDR(bsh);
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goto ok;
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}
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va = i386_trunc_page(bsh);
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endva = i386_round_page(bsh + size);
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#ifdef DIAGNOSTIC
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if (endva <= va)
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panic("i386_memio_unmap: overflow");
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#endif
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(void) pmap_extract(pmap_kernel(), va, &bpa);
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bpa += (bsh & PGOFSET);
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/*
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* Free the kernel virtual mapping.
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*/
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uvm_km_free(kernel_map, va, endva - va);
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} else
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panic("i386_memio_unmap: bad bus space tag");
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ok:
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if (extent_free(ex, bpa, size,
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EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0))) {
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printf("i386_memio_unmap: %s 0x%lx, size 0x%lx\n",
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(t == I386_BUS_SPACE_IO) ? "port" : "pa", bpa, size);
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printf("i386_memio_unmap: can't free region\n");
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}
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}
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void
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i386_memio_free(t, bsh, size)
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bus_space_tag_t t;
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bus_space_handle_t bsh;
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bus_size_t size;
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{
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/* i386_memio_unmap() does all that we need to do. */
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i386_memio_unmap(t, bsh, size);
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}
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int
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i386_memio_subregion(t, bsh, offset, size, nbshp)
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bus_space_tag_t t;
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bus_space_handle_t bsh;
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bus_size_t offset, size;
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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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paddr_t
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i386_memio_mmap(t, addr, off, prot, flags)
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bus_space_tag_t t;
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bus_addr_t addr;
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off_t off;
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int prot;
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int flags;
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{
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|
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/* Can't mmap I/O space. */
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if (t == I386_BUS_SPACE_IO)
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return (-1);
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/*
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* "addr" is the base address of the device we're mapping.
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* "off" is the offset into that device.
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*
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* Note we are called for each "page" in the device that
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* the upper layers want to map.
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*/
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return (i386_btop(addr + off));
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}
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|
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/*
|
|
* Common function for DMA map creation. May be called by bus-specific
|
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* DMA map creation functions.
|
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*/
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int
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_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp)
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bus_dma_tag_t t;
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bus_size_t size;
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int nsegments;
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bus_size_t maxsegsz;
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bus_size_t boundary;
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int flags;
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bus_dmamap_t *dmamp;
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{
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struct i386_bus_dmamap *map;
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void *mapstore;
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size_t mapsize;
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|
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/*
|
|
* Allocate and initialize the DMA map. The end of the map
|
|
* is a variable-sized array of segments, so we allocate enough
|
|
* room for them in one shot.
|
|
*
|
|
* Note we don't preserve the WAITOK or NOWAIT flags. Preservation
|
|
* of ALLOCNOW notifies others that we've reserved these resources,
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|
* and they are not to be freed.
|
|
*
|
|
* The bus_dmamap_t includes one bus_dma_segment_t, hence
|
|
* the (nsegments - 1).
|
|
*/
|
|
mapsize = sizeof(struct i386_bus_dmamap) +
|
|
(sizeof(bus_dma_segment_t) * (nsegments - 1));
|
|
if ((mapstore = malloc(mapsize, M_DMAMAP,
|
|
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
|
|
return (ENOMEM);
|
|
|
|
memset(mapstore, 0, mapsize);
|
|
map = (struct i386_bus_dmamap *)mapstore;
|
|
map->_dm_size = size;
|
|
map->_dm_segcnt = nsegments;
|
|
map->_dm_maxsegsz = maxsegsz;
|
|
map->_dm_boundary = boundary;
|
|
map->_dm_bounce_thresh = t->_bounce_thresh;
|
|
map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT);
|
|
map->dm_mapsize = 0; /* no valid mappings */
|
|
map->dm_nsegs = 0;
|
|
|
|
*dmamp = map;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Common function for DMA map destruction. May be called by bus-specific
|
|
* DMA map destruction functions.
|
|
*/
|
|
void
|
|
_bus_dmamap_destroy(t, map)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
{
|
|
|
|
free(map, M_DMAMAP);
|
|
}
|
|
|
|
/*
|
|
* Common function for loading a DMA map with a linear buffer. May
|
|
* be called by bus-specific DMA map load functions.
|
|
*/
|
|
int
|
|
_bus_dmamap_load(t, map, buf, buflen, p, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
void *buf;
|
|
bus_size_t buflen;
|
|
struct proc *p;
|
|
int flags;
|
|
{
|
|
paddr_t lastaddr;
|
|
int seg, error;
|
|
|
|
/*
|
|
* Make sure that on error condition we return "no valid mappings".
|
|
*/
|
|
map->dm_mapsize = 0;
|
|
map->dm_nsegs = 0;
|
|
|
|
if (buflen > map->_dm_size)
|
|
return (EINVAL);
|
|
|
|
seg = 0;
|
|
error = _bus_dmamap_load_buffer(t, map, buf, buflen, p, flags,
|
|
&lastaddr, &seg, 1);
|
|
if (error == 0) {
|
|
map->dm_mapsize = buflen;
|
|
map->dm_nsegs = seg + 1;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Like _bus_dmamap_load(), but for mbufs.
|
|
*/
|
|
int
|
|
_bus_dmamap_load_mbuf(t, map, m0, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
struct mbuf *m0;
|
|
int flags;
|
|
{
|
|
paddr_t lastaddr;
|
|
int seg, error, first;
|
|
struct mbuf *m;
|
|
|
|
/*
|
|
* Make sure that on error condition we return "no valid mappings."
|
|
*/
|
|
map->dm_mapsize = 0;
|
|
map->dm_nsegs = 0;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((m0->m_flags & M_PKTHDR) == 0)
|
|
panic("_bus_dmamap_load_mbuf: no packet header");
|
|
#endif
|
|
|
|
if (m0->m_pkthdr.len > map->_dm_size)
|
|
return (EINVAL);
|
|
|
|
first = 1;
|
|
seg = 0;
|
|
error = 0;
|
|
for (m = m0; m != NULL && error == 0; m = m->m_next) {
|
|
error = _bus_dmamap_load_buffer(t, map, m->m_data, m->m_len,
|
|
NULL, flags, &lastaddr, &seg, first);
|
|
first = 0;
|
|
}
|
|
if (error == 0) {
|
|
map->dm_mapsize = m0->m_pkthdr.len;
|
|
map->dm_nsegs = seg + 1;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Like _bus_dmamap_load(), but for uios.
|
|
*/
|
|
int
|
|
_bus_dmamap_load_uio(t, map, uio, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
struct uio *uio;
|
|
int flags;
|
|
{
|
|
paddr_t lastaddr;
|
|
int seg, i, error, first;
|
|
bus_size_t minlen, resid;
|
|
struct proc *p = NULL;
|
|
struct iovec *iov;
|
|
caddr_t addr;
|
|
|
|
/*
|
|
* Make sure that on error condition we return "no valid mappings."
|
|
*/
|
|
map->dm_mapsize = 0;
|
|
map->dm_nsegs = 0;
|
|
|
|
resid = uio->uio_resid;
|
|
iov = uio->uio_iov;
|
|
|
|
if (uio->uio_segflg == UIO_USERSPACE) {
|
|
p = uio->uio_procp;
|
|
#ifdef DIAGNOSTIC
|
|
if (p == NULL)
|
|
panic("_bus_dmamap_load_uio: USERSPACE but no proc");
|
|
#endif
|
|
}
|
|
|
|
first = 1;
|
|
seg = 0;
|
|
error = 0;
|
|
for (i = 0; i < uio->uio_iovcnt && resid != 0 && error == 0; i++) {
|
|
/*
|
|
* Now at the first iovec to load. Load each iovec
|
|
* until we have exhausted the residual count.
|
|
*/
|
|
minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
|
|
addr = (caddr_t)iov[i].iov_base;
|
|
|
|
error = _bus_dmamap_load_buffer(t, map, addr, minlen,
|
|
p, flags, &lastaddr, &seg, first);
|
|
first = 0;
|
|
|
|
resid -= minlen;
|
|
}
|
|
if (error == 0) {
|
|
map->dm_mapsize = uio->uio_resid;
|
|
map->dm_nsegs = seg + 1;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Like _bus_dmamap_load(), but for raw memory allocated with
|
|
* bus_dmamem_alloc().
|
|
*/
|
|
int
|
|
_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
bus_size_t size;
|
|
int flags;
|
|
{
|
|
|
|
panic("_bus_dmamap_load_raw: not implemented");
|
|
}
|
|
|
|
/*
|
|
* Common function for unloading a DMA map. May be called by
|
|
* bus-specific DMA map unload functions.
|
|
*/
|
|
void
|
|
_bus_dmamap_unload(t, map)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
{
|
|
|
|
/*
|
|
* No resources to free; just mark the mappings as
|
|
* invalid.
|
|
*/
|
|
map->dm_mapsize = 0;
|
|
map->dm_nsegs = 0;
|
|
}
|
|
|
|
/*
|
|
* Common function for DMA map synchronization. May be called
|
|
* by bus-specific DMA map synchronization functions.
|
|
*/
|
|
void
|
|
_bus_dmamap_sync(t, map, offset, len, ops)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
bus_addr_t offset;
|
|
bus_size_t len;
|
|
int ops;
|
|
{
|
|
|
|
/* Nothing to do here. */
|
|
}
|
|
|
|
/*
|
|
* Common function for DMA-safe memory allocation. May be called
|
|
* by bus-specific DMA memory allocation functions.
|
|
*/
|
|
int
|
|
_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags)
|
|
bus_dma_tag_t t;
|
|
bus_size_t size, alignment, boundary;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
int *rsegs;
|
|
int flags;
|
|
{
|
|
extern paddr_t avail_end;
|
|
|
|
return (_bus_dmamem_alloc_range(t, size, alignment, boundary,
|
|
segs, nsegs, rsegs, flags, 0, trunc_page(avail_end)));
|
|
}
|
|
|
|
/*
|
|
* Common function for freeing DMA-safe memory. May be called by
|
|
* bus-specific DMA memory free functions.
|
|
*/
|
|
void
|
|
_bus_dmamem_free(t, segs, nsegs)
|
|
bus_dma_tag_t t;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
{
|
|
struct vm_page *m;
|
|
bus_addr_t addr;
|
|
struct pglist mlist;
|
|
int curseg;
|
|
|
|
/*
|
|
* Build a list of pages to free back to the VM system.
|
|
*/
|
|
TAILQ_INIT(&mlist);
|
|
for (curseg = 0; curseg < nsegs; curseg++) {
|
|
for (addr = segs[curseg].ds_addr;
|
|
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
|
|
addr += PAGE_SIZE) {
|
|
m = PHYS_TO_VM_PAGE(addr);
|
|
TAILQ_INSERT_TAIL(&mlist, m, pageq);
|
|
}
|
|
}
|
|
|
|
uvm_pglistfree(&mlist);
|
|
}
|
|
|
|
/*
|
|
* Common function for mapping DMA-safe memory. May be called by
|
|
* bus-specific DMA memory map functions.
|
|
*/
|
|
int
|
|
_bus_dmamem_map(t, segs, nsegs, size, kvap, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
size_t size;
|
|
caddr_t *kvap;
|
|
int flags;
|
|
{
|
|
vaddr_t va;
|
|
bus_addr_t addr;
|
|
int curseg;
|
|
|
|
size = round_page(size);
|
|
|
|
va = uvm_km_valloc(kernel_map, size);
|
|
|
|
if (va == 0)
|
|
return (ENOMEM);
|
|
|
|
*kvap = (caddr_t)va;
|
|
|
|
for (curseg = 0; curseg < nsegs; curseg++) {
|
|
for (addr = segs[curseg].ds_addr;
|
|
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
|
|
addr += PAGE_SIZE, va += PAGE_SIZE, size -= PAGE_SIZE) {
|
|
if (size == 0)
|
|
panic("_bus_dmamem_map: size botch");
|
|
pmap_enter(pmap_kernel(), va, addr,
|
|
VM_PROT_READ | VM_PROT_WRITE,
|
|
PMAP_WIRED | VM_PROT_READ | VM_PROT_WRITE);
|
|
}
|
|
}
|
|
pmap_update(pmap_kernel());
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Common function for unmapping DMA-safe memory. May be called by
|
|
* bus-specific DMA memory unmapping functions.
|
|
*/
|
|
void
|
|
_bus_dmamem_unmap(t, kva, size)
|
|
bus_dma_tag_t t;
|
|
caddr_t kva;
|
|
size_t size;
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((u_long)kva & PGOFSET)
|
|
panic("_bus_dmamem_unmap");
|
|
#endif
|
|
|
|
size = round_page(size);
|
|
|
|
uvm_km_free(kernel_map, (vaddr_t)kva, size);
|
|
}
|
|
|
|
/*
|
|
* Common functin for mmap(2)'ing DMA-safe memory. May be called by
|
|
* bus-specific DMA mmap(2)'ing functions.
|
|
*/
|
|
paddr_t
|
|
_bus_dmamem_mmap(t, segs, nsegs, off, prot, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
off_t off;
|
|
int prot, flags;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nsegs; i++) {
|
|
#ifdef DIAGNOSTIC
|
|
if (off & PGOFSET)
|
|
panic("_bus_dmamem_mmap: offset unaligned");
|
|
if (segs[i].ds_addr & PGOFSET)
|
|
panic("_bus_dmamem_mmap: segment unaligned");
|
|
if (segs[i].ds_len & PGOFSET)
|
|
panic("_bus_dmamem_mmap: segment size not multiple"
|
|
" of page size");
|
|
#endif
|
|
if (off >= segs[i].ds_len) {
|
|
off -= segs[i].ds_len;
|
|
continue;
|
|
}
|
|
|
|
return (i386_btop((caddr_t)segs[i].ds_addr + off));
|
|
}
|
|
|
|
/* Page not found. */
|
|
return (-1);
|
|
}
|
|
|
|
/**********************************************************************
|
|
* DMA utility functions
|
|
**********************************************************************/
|
|
|
|
/*
|
|
* Utility function to load a linear buffer. lastaddrp holds state
|
|
* between invocations (for multiple-buffer loads). segp contains
|
|
* the starting segment on entrace, and the ending segment on exit.
|
|
* first indicates if this is the first invocation of this function.
|
|
*/
|
|
int
|
|
_bus_dmamap_load_buffer(t, map, buf, buflen, p, flags, lastaddrp, segp, first)
|
|
bus_dma_tag_t t;
|
|
bus_dmamap_t map;
|
|
void *buf;
|
|
bus_size_t buflen;
|
|
struct proc *p;
|
|
int flags;
|
|
paddr_t *lastaddrp;
|
|
int *segp;
|
|
int first;
|
|
{
|
|
bus_size_t sgsize;
|
|
bus_addr_t curaddr, lastaddr, baddr, bmask;
|
|
vaddr_t vaddr = (vaddr_t)buf;
|
|
int seg;
|
|
pmap_t pmap;
|
|
|
|
if (p != NULL)
|
|
pmap = p->p_vmspace->vm_map.pmap;
|
|
else
|
|
pmap = pmap_kernel();
|
|
|
|
lastaddr = *lastaddrp;
|
|
bmask = ~(map->_dm_boundary - 1);
|
|
|
|
for (seg = *segp; buflen > 0 ; ) {
|
|
/*
|
|
* Get the physical address for this segment.
|
|
*/
|
|
(void) pmap_extract(pmap, vaddr, &curaddr);
|
|
|
|
/*
|
|
* If we're beyond the bounce threshold, notify
|
|
* the caller.
|
|
*/
|
|
if (map->_dm_bounce_thresh != 0 &&
|
|
curaddr >= map->_dm_bounce_thresh)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Compute the segment size, and adjust counts.
|
|
*/
|
|
sgsize = PAGE_SIZE - ((u_long)vaddr & PGOFSET);
|
|
if (buflen < sgsize)
|
|
sgsize = buflen;
|
|
|
|
/*
|
|
* Make sure we don't cross any boundaries.
|
|
*/
|
|
if (map->_dm_boundary > 0) {
|
|
baddr = (curaddr + map->_dm_boundary) & bmask;
|
|
if (sgsize > (baddr - curaddr))
|
|
sgsize = (baddr - curaddr);
|
|
}
|
|
|
|
/*
|
|
* Insert chunk into a segment, coalescing with
|
|
* previous segment if possible.
|
|
*/
|
|
if (first) {
|
|
map->dm_segs[seg].ds_addr = curaddr;
|
|
map->dm_segs[seg].ds_len = sgsize;
|
|
first = 0;
|
|
} else {
|
|
if (curaddr == lastaddr &&
|
|
(map->dm_segs[seg].ds_len + sgsize) <=
|
|
map->_dm_maxsegsz &&
|
|
(map->_dm_boundary == 0 ||
|
|
(map->dm_segs[seg].ds_addr & bmask) ==
|
|
(curaddr & bmask)))
|
|
map->dm_segs[seg].ds_len += sgsize;
|
|
else {
|
|
if (++seg >= map->_dm_segcnt)
|
|
break;
|
|
map->dm_segs[seg].ds_addr = curaddr;
|
|
map->dm_segs[seg].ds_len = sgsize;
|
|
}
|
|
}
|
|
|
|
lastaddr = curaddr + sgsize;
|
|
vaddr += sgsize;
|
|
buflen -= sgsize;
|
|
}
|
|
|
|
*segp = seg;
|
|
*lastaddrp = lastaddr;
|
|
|
|
/*
|
|
* Did we fit?
|
|
*/
|
|
if (buflen != 0)
|
|
return (EFBIG); /* XXX better return value here? */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allocate physical memory from the given physical address range.
|
|
* Called by DMA-safe memory allocation methods.
|
|
*/
|
|
int
|
|
_bus_dmamem_alloc_range(t, size, alignment, boundary, segs, nsegs, rsegs,
|
|
flags, low, high)
|
|
bus_dma_tag_t t;
|
|
bus_size_t size, alignment, boundary;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs;
|
|
int *rsegs;
|
|
int flags;
|
|
paddr_t low;
|
|
paddr_t high;
|
|
{
|
|
paddr_t curaddr, lastaddr;
|
|
struct vm_page *m;
|
|
struct pglist mlist;
|
|
int curseg, error;
|
|
|
|
/* Always round the size. */
|
|
size = round_page(size);
|
|
|
|
/*
|
|
* Allocate pages from the VM system.
|
|
*/
|
|
TAILQ_INIT(&mlist);
|
|
error = uvm_pglistalloc(size, low, high, alignment, boundary,
|
|
&mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Compute the location, size, and number of segments actually
|
|
* returned by the VM code.
|
|
*/
|
|
m = mlist.tqh_first;
|
|
curseg = 0;
|
|
lastaddr = segs[curseg].ds_addr = VM_PAGE_TO_PHYS(m);
|
|
segs[curseg].ds_len = PAGE_SIZE;
|
|
m = m->pageq.tqe_next;
|
|
|
|
for (; m != NULL; m = m->pageq.tqe_next) {
|
|
curaddr = VM_PAGE_TO_PHYS(m);
|
|
#ifdef DIAGNOSTIC
|
|
if (curaddr < low || curaddr >= high) {
|
|
printf("vm_page_alloc_memory returned non-sensical"
|
|
" address 0x%lx\n", curaddr);
|
|
panic("_bus_dmamem_alloc_range");
|
|
}
|
|
#endif
|
|
if (curaddr == (lastaddr + PAGE_SIZE))
|
|
segs[curseg].ds_len += PAGE_SIZE;
|
|
else {
|
|
curseg++;
|
|
segs[curseg].ds_addr = curaddr;
|
|
segs[curseg].ds_len = PAGE_SIZE;
|
|
}
|
|
lastaddr = curaddr;
|
|
}
|
|
|
|
*rsegs = curseg + 1;
|
|
|
|
return (0);
|
|
}
|