LXR qemu/hw/usb/libhw.c

   1/*
   2 * QEMU USB emulation, libhw bits.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a copy
   5 * of this software and associated documentation files (the "Software"), to deal
   6 * in the Software without restriction, including without limitation the rights
   7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8 * copies of the Software, and to permit persons to whom the Software is
   9 * furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  20 * THE SOFTWARE.
  21 */
  22#include "qemu/osdep.h"
  23#include "qemu-common.h"
  24#include "hw/hw.h"
  25#include "hw/usb.h"
  26#include "sysemu/dma.h"
  27
  28int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
  29{
  30    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
  31        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
  32    void *mem;
  33    int i;
  34
  35    for (i = 0; i < sgl->nsg; i++) {
  36        dma_addr_t base = sgl->sg[i].base;
  37        dma_addr_t len = sgl->sg[i].len;
  38
  39        while (len) {
  40            dma_addr_t xlen = len;
  41            mem = dma_memory_map(sgl->as, base, &xlen, dir);
  42            if (!mem) {
  43                goto err;
  44            }
  45            if (xlen > len) {
  46                xlen = len;
  47            }
  48            qemu_iovec_add(&p->iov, mem, xlen);
  49            len -= xlen;
  50            base += xlen;
  51        }
  52    }
  53    return 0;
  54
  55err:
  56    usb_packet_unmap(p, sgl);
  57    return -1;
  58}
  59
  60void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl)
  61{
  62    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
  63        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
  64    int i;
  65
  66    for (i = 0; i < p->iov.niov; i++) {
  67        dma_memory_unmap(sgl->as, p->iov.iov[i].iov_base,
  68                         p->iov.iov[i].iov_len, dir,
  69                         p->iov.iov[i].iov_len);
  70    }
  71}
  72