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 28 int 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 55 err: 56 usb_packet_unmap(p, sgl); 57 return -1; 58 } 59 60 void 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