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MFi386: add bus_dmamap_load_mbuf_sg().

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This commit is contained in:
Olivier Houchard 2005-01-15 19:07:23 +00:00
parent 6728fc65cc
commit 5134102b9d
1 changed files with 36 additions and 0 deletions
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36
sys/arm/arm/busdma_machdep.c
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@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/uio.h>
#include <sys/ktr.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
@ -566,6 +567,41 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
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 = 0;
M_ASSERTPKTHDR(m0);
flags |= BUS_DMA_NOWAIT;
*nsegs = -1;
if (m0->m_pkthdr.len <= dmat->maxsize) {
int first = 1;
vm_offset_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, segs, map,
m->m_data, m->m_len,
pmap_kernel(), flags, &lastaddr,
nsegs);
first = 0;
}
}
} else {
error = EINVAL;
}
/* XXX FIXME: Having to increment nsegs is really annoying */
++*nsegs;
CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x "
"error %d nsegs %d", dmat, dmat->flags, error, *nsegs);
return (error);
}
/*
* Like bus_dmamap_load(), but for uios.
*/