59a703ebaa
These helpers perform read/write requests on entire scatter/gather lists, relieving the device emulation code from mapping and unmapping physical memory, and from looping when map resources are exhausted. 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@6524 c046a42c-6fe2-441c-8c8c-71466251a162
42 lines
1.1 KiB
C
42 lines
1.1 KiB
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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#ifndef DMA_H
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#define DMA_H
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#include <stdio.h>
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#include "cpu.h"
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#include "block.h"
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typedef struct {
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target_phys_addr_t base;
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target_phys_addr_t len;
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} ScatterGatherEntry;
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typedef struct {
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ScatterGatherEntry *sg;
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int nsg;
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int nalloc;
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target_phys_addr_t size;
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} QEMUSGList;
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void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
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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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void qemu_sglist_destroy(QEMUSGList *qsg);
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BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector,
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BlockDriverCompletionFunc *cb, void *opaque);
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#endif
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