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-common.h"
  23 #include "cpu-common.h"
  24 #include "hw/usb.h"
  25 #include "dma.h"
  26
  27 int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
  28 {
  29     int is_write = (p->pid == USB_TOKEN_IN);
  30     target_phys_addr_t len;
  31     void *mem;
  32     int i;
  33
  34     for (i = 0; i < sgl->nsg; i++) {
  35         len = sgl->sg[i].len;
  36         mem = cpu_physical_memory_map(sgl->sg[i].base, &len,
  37                                       is_write);
  38         if (!mem) {
  39             goto err;
  40         }
  41         qemu_iovec_add(&p->iov, mem, len);
  42         if (len != sgl->sg[i].len) {
  43             goto err;
  44         }
  45     }
  46     return 0;
  47
  48 err:
  49     usb_packet_unmap(p);
  50     return -1;
  51 }
  52
  53 void usb_packet_unmap(USBPacket *p)
  54 {
  55     int is_write = (p->pid == USB_TOKEN_IN);
  56     int i;
  57
  58     for (i = 0; i < p->iov.niov; i++) {
  59         cpu_physical_memory_unmap(p->iov.iov[i].iov_base,
  60                                   p->iov.iov[i].iov_len, is_write,
  61                                   p->iov.iov[i].iov_len);
  62     }
  63 }