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/* $OpenBSD: dvma.c,v 1.14 2001/11/06 19:53:16 miod Exp $ */
/* $NetBSD: dvma.c,v 1.5 1996/11/20 18:57:29 gwr Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 REGENTS 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/map.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/user.h>
#include <sys/core.h>
#include <sys/exec.h>
#include <uvm/uvm.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/control.h>
#include <machine/dvma.h>
#include <machine/machdep.h>
#include <machine/pte.h>
#include <machine/pmap.h>
#include <machine/reg.h>
/* Resource map used by dvma_mapin/dvma_mapout */
#define NUM_DVMA_SEGS 10
struct map dvma_segmap[NUM_DVMA_SEGS];
/* XXX: Might need to tune this... */
vm_size_t dvma_segmap_size = 6 * NBSG;
/* Using phys_map to manage DVMA scratch-memory pages. */
/* Note: Could use separate pagemap for obio if needed. */
void
dvma_init()
{
vm_offset_t segmap_addr;
/*
* Create phys_map covering the entire DVMA space,
* then allocate the segment pool from that. The
* remainder will be used as the DVMA page pool.
*/
phys_map = uvm_map_create(pmap_kernel(),
DVMA_SPACE_START, DVMA_SPACE_END, 1);
if (phys_map == NULL)
panic("unable to create DVMA map");
/*
* Reserve the DVMA space used for segment remapping.
* The remainder of phys_map is used for DVMA scratch
* memory pages (i.e. driver control blocks, etc.)
*/
segmap_addr = uvm_km_valloc_wait(phys_map, dvma_segmap_size);
if (segmap_addr != DVMA_SPACE_START)
panic("dvma_init: unable to allocate DVMA segments");
/*
* Create the VM pool used for mapping whole segments
* into DVMA space for the purpose of data transfer.
*/
rminit(dvma_segmap, dvma_segmap_size, segmap_addr,
"dvma_segmap", NUM_DVMA_SEGS);
}
/*
* Allocate actual memory pages in DVMA space.
* (idea for implementation borrowed from Chris Torek.)
*/
caddr_t
dvma_malloc(bytes)
size_t bytes;
{
caddr_t new_mem;
vm_size_t new_size;
if (!bytes)
return NULL;
new_size = round_page(bytes);
new_mem = (caddr_t) uvm_km_alloc(phys_map, new_size);
if (!new_mem)
panic("dvma_malloc: no space in phys_map");
/* The pmap code always makes DVMA pages non-cached. */
return new_mem;
}
/*
* Free pages from dvma_malloc()
*/
void
dvma_free(addr, size)
caddr_t addr;
size_t size;
{
vm_size_t sz = round_page(size);
uvm_km_free(phys_map, (vm_offset_t)addr, sz);
}
/*
* Given a DVMA address, return the physical address that
* would be used by some OTHER bus-master besides the CPU.
* (Examples: on-board ie/le, VME xy board).
*/
long
dvma_kvtopa(kva, bustype)
long kva;
int bustype;
{
long mask;
if (kva < DVMA_SPACE_START || kva >= DVMA_SPACE_END)
panic("dvma_kvtopa: bad dmva addr=0x%x", kva);
switch (bustype) {
case BUS_OBIO:
mask = DVMA_OBIO_SLAVE_MASK;
break;
case BUS_VME16:
case BUS_VME32:
mask = DVMA_VME_SLAVE_MASK;
break;
default:
panic("dvma_kvtopa: bad bus type %d", bustype);
}
return(kva & mask);
}
/*
* Given a range of kernel virtual space, remap all the
* pages found there into the DVMA space (dup mappings).
* This IS safe to call at interrupt time.
* (Typically called at SPLBIO)
*/
caddr_t
dvma_mapin(kva, len)
char *kva;
int len;
{
vm_offset_t seg_kva, seg_dma, seg_len, seg_off;
register vm_offset_t v, x;
register int sme;
int s;
/* Get seg-aligned address and length. */
seg_kva = (vm_offset_t)kva;
seg_len = (vm_offset_t)len;
/* seg-align beginning */
seg_off = seg_kva & SEGOFSET;
seg_kva -= seg_off;
seg_len += seg_off;
/* seg-align length */
seg_len = m68k_round_seg(seg_len);
s = splimp();
/* Allocate the DVMA segment(s) */
seg_dma = rmalloc(dvma_segmap, seg_len);
#ifdef DIAGNOSTIC
if (seg_dma & SEGOFSET)
panic("dvma_mapin: seg not aligned");
#endif
if (seg_dma != 0) {
/* Duplicate the mappings into DMA space. */
v = seg_kva;
x = seg_dma;
while (seg_len > 0) {
sme = get_segmap(v);
#ifdef DIAGNOSTIC
if (sme == SEGINV)
panic("dvma_mapin: seg not mapped");
#endif
#ifdef HAVECACHE
/* flush write-back on old mappings */
if (cache_size)
cache_flush_segment(v);
#endif
set_segmap_allctx(x, sme);
v += NBSG;
x += NBSG;
seg_len -= NBSG;
}
seg_dma += seg_off;
}
splx(s);
return ((caddr_t)seg_dma);
}
/*
* Free some DVMA space allocated by the above.
* This IS safe to call at interrupt time.
* (Typically called at SPLBIO)
*/
void
dvma_mapout(dma, len)
char *dma;
int len;
{
vm_offset_t seg_dma, seg_len, seg_off;
register vm_offset_t v, x;
register int sme;
int s;
/* Get seg-aligned address and length. */
seg_dma = (vm_offset_t)dma;
seg_len = (vm_offset_t)len;
/* seg-align beginning */
seg_off = seg_dma & SEGOFSET;
seg_dma -= seg_off;
seg_len += seg_off;
/* seg-align length */
seg_len = m68k_round_seg(seg_len);
s = splimp();
/* Flush cache and remove DVMA mappings. */
v = seg_dma;
x = v + seg_len;
while (v < x) {
sme = get_segmap(v);
#ifdef DIAGNOSTIC
if (sme == SEGINV)
panic("dvma_mapout: seg not mapped");
#endif
#ifdef HAVECACHE
/* flush write-back on the DVMA mappings */
if (cache_size)
cache_flush_segment(v);
#endif
set_segmap_allctx(v, SEGINV);
v += NBSG;
}
rmfree(dvma_segmap, seg_len, seg_dma);
splx(s);
}
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