Initial bus_space support routines (should be common across
all platforms and buses).
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matt
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/* $NetBSD: bus_mem.c,v 1.1 1998/10/27 21:19:48 matt Exp $ */
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/*
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* Copyright (c) 1998 Matt Thomas
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* All rights reserved.
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*
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* This code is derived from software contributed to Ludd by Bertram Barth.
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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 at Ludd, University of
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* Lule}, Sweden and its contributors.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <machine/cpu.h>
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#include <machine/pmap.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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static int
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vax_mem_add_mapping(
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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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vm_offset_t va;
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pa = trunc_page(bpa);
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endpa = round_page(bpa + size);
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#if defined(UVM)
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va = uvm_km_valloc(kernel_map, endpa - pa);
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#else
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va = kmem_alloc_pageable(kernel_map, endpa - pa);
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#endif
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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 += NBPG, va += NBPG) {
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pmap_enter(pmap_kernel(), va, pa,
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VM_PROT_READ | VM_PROT_WRITE, TRUE);
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}
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return 0;
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}
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static int
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vax_mem_bus_space_map(
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void *t,
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bus_addr_t a,
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bus_size_t s,
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int f,
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bus_space_handle_t *hp,
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int f2)
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{
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return vax_mem_add_mapping(a, s, (f & BUS_SPACE_MAP_CACHEABLE), hp);
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}
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static int
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vax_mem_bus_space_subregion(
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void *t,
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bus_space_handle_t h,
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bus_size_t o,
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bus_size_t s,
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bus_space_handle_t *hp)
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{
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*hp = h + o;
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return (0);
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}
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static void
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vax_mem_bus_space_unmap(
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void *t,
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bus_space_handle_t h,
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bus_size_t size,
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int f)
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{
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u_long va = trunc_page(h);
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u_long endva = round_page(h + size);
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/*
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* Free the kernel virtual mapping.
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*/
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#if defined(UVM)
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uvm_km_free(kernel_map, va, endva - va);
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#else
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kmem_free(kernel_map, va, endva - va);
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#endif
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}
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static int
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vax_mem_bus_space_alloc(
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void *t,
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bus_addr_t rs,
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bus_addr_t re,
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bus_size_t s,
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bus_size_t a,
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bus_size_t b,
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int f,
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bus_addr_t *ap,
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bus_space_handle_t *hp)
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{
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panic("vax_mem_bus_alloc not implemented");
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}
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static void
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vax_mem_bus_space_free(
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void *t,
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bus_space_handle_t h,
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bus_size_t s)
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{
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panic("vax_mem_bus_free not implemented");
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}
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static const struct vax_bus_space vax_mem_bus_space = {
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NULL,
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vax_mem_bus_space_map,
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vax_mem_bus_space_unmap,
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vax_mem_bus_space_subregion,
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vax_mem_bus_space_alloc,
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vax_mem_bus_space_free
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};
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