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Implement bus_dmamap_load_mbuf().

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This commit is contained in:
thorpej 1998-01-27 02:35:58 +00:00
parent c7c415e733
commit 5ac7e550d1
1 changed files with 87 additions and 27 deletions
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114
sys/arch/alpha/common/bus_dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: bus_dma.c,v 1.8 1998/01/19 03:12:20 thorpej Exp $ */
/* $NetBSD: bus_dma.c,v 1.9 1998/01/27 02:35:58 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -39,7 +39,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.8 1998/01/19 03:12:20 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.9 1998/01/27 02:35:58 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -47,6 +47,7 @@ __KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.8 1998/01/19 03:12:20 thorpej Exp $");
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
@ -55,6 +56,10 @@ __KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.8 1998/01/19 03:12:20 thorpej Exp $");
#include <machine/bus.h>
#include <machine/intr.h>
int _bus_dmamap_load_buffer_direct_common __P((bus_dmamap_t,
void *, bus_size_t, struct proc *, int, bus_addr_t,
vm_offset_t *, int *, int));
/*
* Common function for DMA map creation. May be called by bus-specific
* DMA map creation functions.
@ -118,40 +123,32 @@ _bus_dmamap_destroy(t, map)
}
/*
* Common function for loading a direct-mapped DMA map with a linear
* buffer. Called by bus-specific DMA map load functions with the
* OR value appropriate for indicating "direct-mapped" for that
* chipset.
* Utility function to load a linear buffer. lastaddrp holds state
* between invocations (for multiple-buffer loads). segp contains
* the starting segment on entrance, and the ending segment on exit.
* first indicates if this is the first invocation of this function.
*/
int
_bus_dmamap_load_direct_common(t, map, buf, buflen, p, flags, wbase)
bus_dma_tag_t t;
_bus_dmamap_load_buffer_direct_common(map, buf, buflen, p, flags, wbase,
lastaddrp, segp, first)
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
bus_addr_t wbase;
vm_offset_t *lastaddrp;
int *segp;
int first;
{
bus_size_t sgsize;
vm_offset_t curaddr, lastaddr;
vm_offset_t vaddr = (vm_offset_t)buf;
int first, seg;
int seg;
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_nsegs = 0;
lastaddr = *lastaddrp;
if (buflen > map->_dm_size)
return (EINVAL);
/*
* XXX Need to implement "don't dma across this boundry".
*/
lastaddr = ~0; /* XXX gcc */
for (first = 1, seg = 0; buflen > 0 && seg < map->_dm_segcnt; ) {
for (seg = *segp; buflen > 0 && seg < map->_dm_segcnt; ) {
/*
* Get the physical address for this segment.
*/
@ -195,6 +192,9 @@ _bus_dmamap_load_direct_common(t, map, buf, buflen, p, flags, wbase)
buflen -= sgsize;
}
*segp = seg;
*lastaddrp = lastaddr;
/*
* Did we fit?
*/
@ -204,24 +204,84 @@ _bus_dmamap_load_direct_common(t, map, buf, buflen, p, flags, wbase)
*/
return (EFBIG); /* XXX better return value here? */
}
map->dm_nsegs = seg + 1;
return (0);
}
/*
* Common function for loading a direct-mapped DMA map with a linear
* buffer. Called by bus-specific DMA map load functions with the
* OR value appropriate for indicating "direct-mapped" for that
* chipset.
*/
int
_bus_dmamap_load_direct_common(t, map, buf, buflen, p, flags, wbase)
bus_dma_tag_t t;
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
bus_addr_t wbase;
{
vm_offset_t lastaddr;
int seg, error;
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_nsegs = 0;
if (buflen > map->_dm_size)
return (EINVAL);
seg = 0;
error = _bus_dmamap_load_buffer_direct_common(map, buf, buflen,
p, flags, wbase, &lastaddr, &seg, 1);
if (error == 0)
map->dm_nsegs = seg + 1;
return (error);
}
/*
* Like _bus_dmamap_load_direct_common(), but for mbufs.
*/
int
_bus_dmamap_load_mbuf_direct_common(t, map, m, flags, wbase)
_bus_dmamap_load_mbuf_direct_common(t, map, m0, flags, wbase)
bus_dma_tag_t t;
bus_dmamap_t map;
struct mbuf *m;
struct mbuf *m0;
int flags;
bus_addr_t wbase;
{
vm_offset_t lastaddr;
int seg, error, first;
struct mbuf *m;
panic("_bus_dmamap_load_mbuf_direct_common: not implemented");
/*
* Make sure that on error condition we return "no valid mappings."
*/
map->dm_nsegs = 0;
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_bus_dmamap_load_mbuf_direct_common: 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_direct_common(map,
m->m_data, m->m_len, NULL, flags, wbase, &lastaddr,
&seg, first);
first = 0;
}
if (error == 0)
map->dm_nsegs = seg + 1;
return (error);
}
/*