qemu

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/*
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 * QEMU USB emulation, libhw bits.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 */
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#include "qemu/osdep.h"
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#include "hw/usb.h"
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#include "sysemu/dma.h"
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int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
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{
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    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
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        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
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    void *mem;
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    int i;
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    for (i = 0; i < sgl->nsg; i++) {
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        dma_addr_t base = sgl->sg[i].base;
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        dma_addr_t len = sgl->sg[i].len;
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        while (len) {
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            dma_addr_t xlen = len;
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            mem = dma_memory_map(sgl->as, base, &xlen, dir,
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                                 MEMTXATTRS_UNSPECIFIED);
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            if (!mem) {
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                goto err;
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            }
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            if (xlen > len) {
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                xlen = len;
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            }
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            qemu_iovec_add(&p->iov, mem, xlen);
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            len -= xlen;
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            base += xlen;
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        }
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    }
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    return 0;
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err:
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    usb_packet_unmap(p, sgl);
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    return -1;
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}
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void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl)
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{
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    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
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        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
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    int i;
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    for (i = 0; i < p->iov.niov; i++) {
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        dma_memory_unmap(sgl->as, p->iov.iov[i].iov_base,
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                         p->iov.iov[i].iov_len, dir,
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                         p->iov.iov[i].iov_len);
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    }
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}
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