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 "hw/usb.h"
  24#include "sysemu/dma.h"
  25
  26int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
  27{
  28    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
  29        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
  30    void *mem;
  31    int i;
  32
  33    for (i = 0; i < sgl->nsg; i++) {
  34        dma_addr_t base = sgl->sg[i].base;
  35        dma_addr_t len = sgl->sg[i].len;
  36
  37        while (len) {
  38            dma_addr_t xlen = len;
  39            mem = dma_memory_map(sgl->as, base, &xlen, dir);
  40            if (!mem) {
  41                goto err;
  42            }
  43            if (xlen > len) {
  44                xlen = len;
  45            }
  46            qemu_iovec_add(&p->iov, mem, xlen);
  47            len -= xlen;
  48            base += xlen;
  49        }
  50    }
  51    return 0;
  52
  53err:
  54    usb_packet_unmap(p, sgl);
  55    return -1;
  56}
  57
  58void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl)
  59{
  60    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
  61        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
  62    int i;
  63
  64    for (i = 0; i < p->iov.niov; i++) {
  65        dma_memory_unmap(sgl->as, p->iov.iov[i].iov_base,
  66                         p->iov.iov[i].iov_len, dir,
  67                         p->iov.iov[i].iov_len);
  68    }
  69}
  70