1 files changed, 70 insertions, 0 deletions
diff --git a/qemu/hw/usb/libhw.c b/qemu/hw/usb/libhw.c
new file mode 100644
index 000000000..8df11c461
--- /dev/null
+++ b/qemu/hw/usb/libhw.c
@@ -0,0 +1,70 @@
+/*
+ * QEMU USB emulation, libhw bits.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu-common.h"
+#include "hw/hw.h"
+#include "hw/usb.h"
+#include "sysemu/dma.h"
+
+int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
+{
+    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
+        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
+    void *mem;
+    int i;
+
+    for (i = 0; i < sgl->nsg; i++) {
+        dma_addr_t base = sgl->sg[i].base;
+        dma_addr_t len = sgl->sg[i].len;
+
+        while (len) {
+            dma_addr_t xlen = len;
+            mem = dma_memory_map(sgl->as, base, &xlen, dir);
+            if (!mem) {
+                goto err;
+            }
+            if (xlen > len) {
+                xlen = len;
+            }
+            qemu_iovec_add(&p->iov, mem, xlen);
+            len -= xlen;
+            base += xlen;
+        }
+    }
+    return 0;
+
+err:
+    usb_packet_unmap(p, sgl);
+    return -1;
+}
+
+void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl)
+{
+    DMADirection dir = (p->pid == USB_TOKEN_IN) ?
+        DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
+    int i;
+
+    for (i = 0; i < p->iov.niov; i++) {
+        dma_memory_unmap(sgl->as, p->iov.iov[i].iov_base,
+                         p->iov.iov[i].iov_len, dir,
+                         p->iov.iov[i].iov_len);
+    }
+}