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244ab90e17
Scatter-gather lists are used extensively in dma-capable devices; a single data structure allows more code reuse later on. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6522 c046a42c-6fe2-441c-8c8c-71466251a162
39 lines
848 B
C
39 lines
848 B
C
/*
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* DMA helper functions
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*
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* Copyright (c) 2009 Red Hat
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*
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* This work is licensed under the terms of the GNU General Public License
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* (GNU GPL), version 2 or later.
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*/
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#include "dma.h"
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void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint)
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{
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qsg->sg = qemu_malloc(alloc_hint * sizeof(ScatterGatherEntry));
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qsg->nsg = 0;
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qsg->nalloc = alloc_hint;
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qsg->size = 0;
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}
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void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
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target_phys_addr_t len)
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{
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if (qsg->nsg == qsg->nalloc) {
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qsg->nalloc = 2 * qsg->nalloc + 1;
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qsg->sg = qemu_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
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}
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qsg->sg[qsg->nsg].base = base;
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qsg->sg[qsg->nsg].len = len;
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qsg->size += len;
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++qsg->nsg;
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}
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void qemu_sglist_destroy(QEMUSGList *qsg)
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{
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qemu_free(qsg->sg);
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}
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