4f4321c11f
Zap data pointer from USBPacket, add a QEMUIOVector instead. Add a bunch of helper functions to manage USBPacket data. Switch over users to the new interface. Note that USBPacket->len was used for two purposes: First to pass in the buffer size and second to return the number of transfered bytes or the status code on async transfers. There is a new result variable for the latter. A new status code was added to catch uninitialized result. Nobody creates iovecs with more than one element (yet). Some users are (temporarely) limited to iovecs with a single element to keep the patch size as small as possible. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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* QEMU USB emulation, libhw bits.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#include "cpu-common.h"
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#include "usb.h"
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#include "dma.h"
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int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
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{
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int is_write = (p->pid == USB_TOKEN_IN);
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target_phys_addr_t len;
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void *mem;
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int i;
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for (i = 0; i < sgl->nsg; i++) {
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len = sgl->sg[i].len;
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mem = cpu_physical_memory_map(sgl->sg[i].base, &len,
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is_write);
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if (!mem) {
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goto err;
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}
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qemu_iovec_add(&p->iov, mem, len);
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if (len != sgl->sg[i].len) {
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goto err;
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}
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}
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return 0;
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err:
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usb_packet_unmap(p);
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return -1;
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}
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void usb_packet_unmap(USBPacket *p)
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{
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int is_write = (p->pid == USB_TOKEN_IN);
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int i;
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for (i = 0; i < p->iov.niov; i++) {
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cpu_physical_memory_unmap(p->iov.iov[i].iov_base,
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p->iov.iov[i].iov_len, is_write,
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p->iov.iov[i].iov_len);
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}
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}
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