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Add bus_dmamap_load_mbuf_sg() to alpha.

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This commit is contained in:
Scott Long 2005-01-15 20:11:25 +00:00
parent a9e9b7e47b
commit 2f69affe36
2 changed files with 42 additions and 5 deletions
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44
sys/alpha/alpha/busdma_machdep.c
View File

@ -637,18 +637,16 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
struct thread *td,
int flags,
vm_offset_t *lastaddrp,
bus_dma_segment_t *segs,
int *segp,
int first)
{
bus_dma_segment_t *segs;
bus_size_t sgsize;
bus_addr_t curaddr, lastaddr, baddr, bmask;
vm_offset_t vaddr = (vm_offset_t)buf;
int seg;
pmap_t pmap;
segs = dmat->segments;
if (td != NULL)
pmap = vmspace_pmap(td->td_proc->p_vmspace);
else
@ -745,7 +743,7 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
error = _bus_dmamap_load_buffer(dmat,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
&nsegs, first);
dmat->segments, &nsegs, first);
first = 0;
}
}
@ -763,6 +761,41 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
return (error);
}
int
bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *m0, bus_dma_segment_t *segs,
int *nsegs, int flags)
{
int error;
KASSERT(dmat->lowaddr >= ptoa(Maxmem) || map != NULL,
("bus_dmamap_load_mbuf: No support for bounce pages!"));
M_ASSERTPKTHDR(m0);
*nsegs = 0;
error = 0;
if (m0->m_pkthdr.len <= dmat->maxsize) {
int first = 1;
bus_addr_t lastaddr = 0;
struct mbuf *m;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len > 0) {
error = _bus_dmamap_load_buffer(dmat,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
segs, nsegs, first);
first = 0;
}
}
++*nsegs;
} else {
error = EINVAL;
}
return (error);
}
/*
* Like _bus_dmamap_load(), but for uios.
*/
@ -804,7 +837,8 @@ bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
if (minlen > 0) {
error = _bus_dmamap_load_buffer(dmat, addr, minlen,
td, flags, &lastaddr, &nsegs, first);
td, flags, &lastaddr, dmat->segments,
&nsegs, first);
first = 0;
resid -= minlen;

3
sys/alpha/include/bus.h
View File

@ -639,6 +639,9 @@ int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf, bus_dma_segment_t *segs,
int *nsegs, int flags);
/*
* Like bus_dmamap_load but for uios. Note the use of the
* bus_dmamap_callback2_t interface.