root / hw / usb-msd.c @ 806b6024
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/*
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---|---|
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* USB Mass Storage Device emulation
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*
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* Copyright (c) 2006 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the LGPL.
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*/
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#include "qemu-common.h" |
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#include "usb.h" |
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#include "block.h" |
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#include "scsi-disk.h" |
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#include "console.h" |
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|
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//#define DEBUG_MSD
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|
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#ifdef DEBUG_MSD
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#define DPRINTF(fmt, ...) \
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do { printf("usb-msd: " fmt , ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) do {} while(0) |
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#endif
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|
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/* USB requests. */
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#define MassStorageReset 0xff |
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#define GetMaxLun 0xfe |
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|
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enum USBMSDMode {
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USB_MSDM_CBW, /* Command Block. */
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USB_MSDM_DATAOUT, /* Tranfer data to device. */
|
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USB_MSDM_DATAIN, /* Transfer data from device. */
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USB_MSDM_CSW /* Command Status. */
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}; |
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typedef struct { |
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USBDevice dev; |
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enum USBMSDMode mode;
|
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uint32_t scsi_len; |
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uint8_t *scsi_buf; |
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uint32_t usb_len; |
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uint8_t *usb_buf; |
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uint32_t data_len; |
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uint32_t residue; |
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uint32_t tag; |
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BlockDriverState *bs; |
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SCSIDevice *scsi_dev; |
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int result;
|
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/* For async completion. */
|
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USBPacket *packet; |
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} MSDState; |
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|
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struct usb_msd_cbw {
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uint32_t sig; |
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uint32_t tag; |
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uint32_t data_len; |
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uint8_t flags; |
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uint8_t lun; |
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uint8_t cmd_len; |
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uint8_t cmd[16];
|
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}; |
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|
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struct usb_msd_csw {
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uint32_t sig; |
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uint32_t tag; |
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uint32_t residue; |
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uint8_t status; |
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}; |
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|
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static const uint8_t qemu_msd_dev_descriptor[] = { |
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0x12, /* u8 bLength; */ |
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0x01, /* u8 bDescriptorType; Device */ |
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0x00, 0x01, /* u16 bcdUSB; v1.0 */ |
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|
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0x00, /* u8 bDeviceClass; */ |
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0x00, /* u8 bDeviceSubClass; */ |
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0x00, /* u8 bDeviceProtocol; [ low/full speeds only ] */ |
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0x08, /* u8 bMaxPacketSize0; 8 Bytes */ |
79 |
|
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/* Vendor and product id are arbitrary. */
|
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0x00, 0x00, /* u16 idVendor; */ |
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0x00, 0x00, /* u16 idProduct; */ |
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0x00, 0x00, /* u16 bcdDevice */ |
84 |
|
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0x01, /* u8 iManufacturer; */ |
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0x02, /* u8 iProduct; */ |
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0x03, /* u8 iSerialNumber; */ |
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0x01 /* u8 bNumConfigurations; */ |
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}; |
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|
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static const uint8_t qemu_msd_config_descriptor[] = { |
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|
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/* one configuration */
|
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0x09, /* u8 bLength; */ |
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0x02, /* u8 bDescriptorType; Configuration */ |
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0x20, 0x00, /* u16 wTotalLength; */ |
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0x01, /* u8 bNumInterfaces; (1) */ |
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0x01, /* u8 bConfigurationValue; */ |
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0x00, /* u8 iConfiguration; */ |
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0xc0, /* u8 bmAttributes; |
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Bit 7: must be set,
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6: Self-powered,
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5: Remote wakeup,
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4..0: resvd */
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0x00, /* u8 MaxPower; */ |
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|
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/* one interface */
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0x09, /* u8 if_bLength; */ |
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0x04, /* u8 if_bDescriptorType; Interface */ |
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0x00, /* u8 if_bInterfaceNumber; */ |
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0x00, /* u8 if_bAlternateSetting; */ |
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0x02, /* u8 if_bNumEndpoints; */ |
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0x08, /* u8 if_bInterfaceClass; MASS STORAGE */ |
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0x06, /* u8 if_bInterfaceSubClass; SCSI */ |
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0x50, /* u8 if_bInterfaceProtocol; Bulk Only */ |
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0x00, /* u8 if_iInterface; */ |
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|
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/* Bulk-In endpoint */
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0x07, /* u8 ep_bLength; */ |
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0x05, /* u8 ep_bDescriptorType; Endpoint */ |
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0x81, /* u8 ep_bEndpointAddress; IN Endpoint 1 */ |
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0x02, /* u8 ep_bmAttributes; Bulk */ |
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0x40, 0x00, /* u16 ep_wMaxPacketSize; */ |
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0x00, /* u8 ep_bInterval; */ |
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|
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/* Bulk-Out endpoint */
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0x07, /* u8 ep_bLength; */ |
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0x05, /* u8 ep_bDescriptorType; Endpoint */ |
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0x02, /* u8 ep_bEndpointAddress; OUT Endpoint 2 */ |
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0x02, /* u8 ep_bmAttributes; Bulk */ |
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0x40, 0x00, /* u16 ep_wMaxPacketSize; */ |
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0x00 /* u8 ep_bInterval; */ |
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}; |
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|
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static void usb_msd_copy_data(MSDState *s) |
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{ |
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uint32_t len; |
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len = s->usb_len; |
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if (len > s->scsi_len)
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len = s->scsi_len; |
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if (s->mode == USB_MSDM_DATAIN) {
|
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memcpy(s->usb_buf, s->scsi_buf, len); |
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} else {
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memcpy(s->scsi_buf, s->usb_buf, len); |
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} |
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s->usb_len -= len; |
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s->scsi_len -= len; |
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s->usb_buf += len; |
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s->scsi_buf += len; |
150 |
s->data_len -= len; |
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if (s->scsi_len == 0) { |
152 |
if (s->mode == USB_MSDM_DATAIN) {
|
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s->scsi_dev->read_data(s->scsi_dev, s->tag); |
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} else if (s->mode == USB_MSDM_DATAOUT) { |
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s->scsi_dev->write_data(s->scsi_dev, s->tag); |
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} |
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} |
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} |
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|
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static void usb_msd_send_status(MSDState *s) |
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{ |
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struct usb_msd_csw csw;
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csw.sig = cpu_to_le32(0x53425355);
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csw.tag = cpu_to_le32(s->tag); |
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csw.residue = s->residue; |
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csw.status = s->result; |
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memcpy(s->usb_buf, &csw, 13);
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} |
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|
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static void usb_msd_command_complete(void *opaque, int reason, uint32_t tag, |
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uint32_t arg) |
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{ |
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MSDState *s = (MSDState *)opaque; |
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USBPacket *p = s->packet; |
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|
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if (tag != s->tag) {
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fprintf(stderr, "usb-msd: Unexpected SCSI Tag 0x%x\n", tag);
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} |
180 |
if (reason == SCSI_REASON_DONE) {
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DPRINTF("Command complete %d\n", arg);
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s->residue = s->data_len; |
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s->result = arg != 0;
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if (s->packet) {
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if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) { |
186 |
/* A deferred packet with no write data remaining must be
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the status read packet. */
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usb_msd_send_status(s); |
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s->mode = USB_MSDM_CBW; |
190 |
} else {
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if (s->data_len) {
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s->data_len -= s->usb_len; |
193 |
if (s->mode == USB_MSDM_DATAIN)
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memset(s->usb_buf, 0, s->usb_len);
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s->usb_len = 0;
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} |
197 |
if (s->data_len == 0) |
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s->mode = USB_MSDM_CSW; |
199 |
} |
200 |
s->packet = NULL;
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usb_packet_complete(p); |
202 |
} else if (s->data_len == 0) { |
203 |
s->mode = USB_MSDM_CSW; |
204 |
} |
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return;
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} |
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s->scsi_len = arg; |
208 |
s->scsi_buf = s->scsi_dev->get_buf(s->scsi_dev, tag); |
209 |
if (p) {
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usb_msd_copy_data(s); |
211 |
if (s->usb_len == 0) { |
212 |
/* Set s->packet to NULL before calling usb_packet_complete
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because annother request may be issued before
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usb_packet_complete returns. */
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DPRINTF("Packet complete %p\n", p);
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s->packet = NULL;
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usb_packet_complete(p); |
218 |
} |
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} |
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} |
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|
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static void usb_msd_handle_reset(USBDevice *dev) |
223 |
{ |
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MSDState *s = (MSDState *)dev; |
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DPRINTF("Reset\n");
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s->mode = USB_MSDM_CBW; |
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} |
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static int usb_msd_handle_control(USBDevice *dev, int request, int value, |
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int index, int length, uint8_t *data) |
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{ |
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MSDState *s = (MSDState *)dev; |
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int ret = 0; |
235 |
|
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switch (request) {
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case DeviceRequest | USB_REQ_GET_STATUS:
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data[0] = (1 << USB_DEVICE_SELF_POWERED) | |
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(dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP); |
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data[1] = 0x00; |
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ret = 2;
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break;
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case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
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if (value == USB_DEVICE_REMOTE_WAKEUP) {
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dev->remote_wakeup = 0;
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} else {
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goto fail;
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} |
249 |
ret = 0;
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break;
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case DeviceOutRequest | USB_REQ_SET_FEATURE:
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if (value == USB_DEVICE_REMOTE_WAKEUP) {
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dev->remote_wakeup = 1;
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} else {
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goto fail;
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} |
257 |
ret = 0;
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break;
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case DeviceOutRequest | USB_REQ_SET_ADDRESS:
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dev->addr = value; |
261 |
ret = 0;
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break;
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case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
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switch(value >> 8) { |
265 |
case USB_DT_DEVICE:
|
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memcpy(data, qemu_msd_dev_descriptor, |
267 |
sizeof(qemu_msd_dev_descriptor));
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ret = sizeof(qemu_msd_dev_descriptor);
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break;
|
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case USB_DT_CONFIG:
|
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memcpy(data, qemu_msd_config_descriptor, |
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sizeof(qemu_msd_config_descriptor));
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ret = sizeof(qemu_msd_config_descriptor);
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274 |
break;
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275 |
case USB_DT_STRING:
|
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switch(value & 0xff) { |
277 |
case 0: |
278 |
/* language ids */
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data[0] = 4; |
280 |
data[1] = 3; |
281 |
data[2] = 0x09; |
282 |
data[3] = 0x04; |
283 |
ret = 4;
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284 |
break;
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285 |
case 1: |
286 |
/* vendor description */
|
287 |
ret = set_usb_string(data, "QEMU " QEMU_VERSION);
|
288 |
break;
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289 |
case 2: |
290 |
/* product description */
|
291 |
ret = set_usb_string(data, "QEMU USB HARDDRIVE");
|
292 |
break;
|
293 |
case 3: |
294 |
/* serial number */
|
295 |
ret = set_usb_string(data, "1");
|
296 |
break;
|
297 |
default:
|
298 |
goto fail;
|
299 |
} |
300 |
break;
|
301 |
default:
|
302 |
goto fail;
|
303 |
} |
304 |
break;
|
305 |
case DeviceRequest | USB_REQ_GET_CONFIGURATION:
|
306 |
data[0] = 1; |
307 |
ret = 1;
|
308 |
break;
|
309 |
case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
|
310 |
ret = 0;
|
311 |
break;
|
312 |
case DeviceRequest | USB_REQ_GET_INTERFACE:
|
313 |
data[0] = 0; |
314 |
ret = 1;
|
315 |
break;
|
316 |
case DeviceOutRequest | USB_REQ_SET_INTERFACE:
|
317 |
ret = 0;
|
318 |
break;
|
319 |
case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
|
320 |
if (value == 0 && index != 0x81) { /* clear ep halt */ |
321 |
goto fail;
|
322 |
} |
323 |
ret = 0;
|
324 |
break;
|
325 |
/* Class specific requests. */
|
326 |
case MassStorageReset:
|
327 |
/* Reset state ready for the next CBW. */
|
328 |
s->mode = USB_MSDM_CBW; |
329 |
ret = 0;
|
330 |
break;
|
331 |
case GetMaxLun:
|
332 |
data[0] = 0; |
333 |
ret = 1;
|
334 |
break;
|
335 |
default:
|
336 |
fail:
|
337 |
ret = USB_RET_STALL; |
338 |
break;
|
339 |
} |
340 |
return ret;
|
341 |
} |
342 |
|
343 |
static void usb_msd_cancel_io(USBPacket *p, void *opaque) |
344 |
{ |
345 |
MSDState *s = opaque; |
346 |
s->scsi_dev->cancel_io(s->scsi_dev, s->tag); |
347 |
s->packet = NULL;
|
348 |
s->scsi_len = 0;
|
349 |
} |
350 |
|
351 |
static int usb_msd_handle_data(USBDevice *dev, USBPacket *p) |
352 |
{ |
353 |
MSDState *s = (MSDState *)dev; |
354 |
int ret = 0; |
355 |
struct usb_msd_cbw cbw;
|
356 |
uint8_t devep = p->devep; |
357 |
uint8_t *data = p->data; |
358 |
int len = p->len;
|
359 |
|
360 |
switch (p->pid) {
|
361 |
case USB_TOKEN_OUT:
|
362 |
if (devep != 2) |
363 |
goto fail;
|
364 |
|
365 |
switch (s->mode) {
|
366 |
case USB_MSDM_CBW:
|
367 |
if (len != 31) { |
368 |
fprintf(stderr, "usb-msd: Bad CBW size");
|
369 |
goto fail;
|
370 |
} |
371 |
memcpy(&cbw, data, 31);
|
372 |
if (le32_to_cpu(cbw.sig) != 0x43425355) { |
373 |
fprintf(stderr, "usb-msd: Bad signature %08x\n",
|
374 |
le32_to_cpu(cbw.sig)); |
375 |
goto fail;
|
376 |
} |
377 |
DPRINTF("Command on LUN %d\n", cbw.lun);
|
378 |
if (cbw.lun != 0) { |
379 |
fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
|
380 |
goto fail;
|
381 |
} |
382 |
s->tag = le32_to_cpu(cbw.tag); |
383 |
s->data_len = le32_to_cpu(cbw.data_len); |
384 |
if (s->data_len == 0) { |
385 |
s->mode = USB_MSDM_CSW; |
386 |
} else if (cbw.flags & 0x80) { |
387 |
s->mode = USB_MSDM_DATAIN; |
388 |
} else {
|
389 |
s->mode = USB_MSDM_DATAOUT; |
390 |
} |
391 |
DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
|
392 |
s->tag, cbw.flags, cbw.cmd_len, s->data_len); |
393 |
s->residue = 0;
|
394 |
s->scsi_dev->send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
|
395 |
/* ??? Should check that USB and SCSI data transfer
|
396 |
directions match. */
|
397 |
if (s->residue == 0) { |
398 |
if (s->mode == USB_MSDM_DATAIN) {
|
399 |
s->scsi_dev->read_data(s->scsi_dev, s->tag); |
400 |
} else if (s->mode == USB_MSDM_DATAOUT) { |
401 |
s->scsi_dev->write_data(s->scsi_dev, s->tag); |
402 |
} |
403 |
} |
404 |
ret = len; |
405 |
break;
|
406 |
|
407 |
case USB_MSDM_DATAOUT:
|
408 |
DPRINTF("Data out %d/%d\n", len, s->data_len);
|
409 |
if (len > s->data_len)
|
410 |
goto fail;
|
411 |
|
412 |
s->usb_buf = data; |
413 |
s->usb_len = len; |
414 |
if (s->scsi_len) {
|
415 |
usb_msd_copy_data(s); |
416 |
} |
417 |
if (s->residue && s->usb_len) {
|
418 |
s->data_len -= s->usb_len; |
419 |
if (s->data_len == 0) |
420 |
s->mode = USB_MSDM_CSW; |
421 |
s->usb_len = 0;
|
422 |
} |
423 |
if (s->usb_len) {
|
424 |
DPRINTF("Deferring packet %p\n", p);
|
425 |
usb_defer_packet(p, usb_msd_cancel_io, s); |
426 |
s->packet = p; |
427 |
ret = USB_RET_ASYNC; |
428 |
} else {
|
429 |
ret = len; |
430 |
} |
431 |
break;
|
432 |
|
433 |
default:
|
434 |
DPRINTF("Unexpected write (len %d)\n", len);
|
435 |
goto fail;
|
436 |
} |
437 |
break;
|
438 |
|
439 |
case USB_TOKEN_IN:
|
440 |
if (devep != 1) |
441 |
goto fail;
|
442 |
|
443 |
switch (s->mode) {
|
444 |
case USB_MSDM_DATAOUT:
|
445 |
if (s->data_len != 0 || len < 13) |
446 |
goto fail;
|
447 |
/* Waiting for SCSI write to complete. */
|
448 |
usb_defer_packet(p, usb_msd_cancel_io, s); |
449 |
s->packet = p; |
450 |
ret = USB_RET_ASYNC; |
451 |
break;
|
452 |
|
453 |
case USB_MSDM_CSW:
|
454 |
DPRINTF("Command status %d tag 0x%x, len %d\n",
|
455 |
s->result, s->tag, len); |
456 |
if (len < 13) |
457 |
goto fail;
|
458 |
|
459 |
s->usb_len = len; |
460 |
s->usb_buf = data; |
461 |
usb_msd_send_status(s); |
462 |
s->mode = USB_MSDM_CBW; |
463 |
ret = 13;
|
464 |
break;
|
465 |
|
466 |
case USB_MSDM_DATAIN:
|
467 |
DPRINTF("Data in %d/%d\n", len, s->data_len);
|
468 |
if (len > s->data_len)
|
469 |
len = s->data_len; |
470 |
s->usb_buf = data; |
471 |
s->usb_len = len; |
472 |
if (s->scsi_len) {
|
473 |
usb_msd_copy_data(s); |
474 |
} |
475 |
if (s->residue && s->usb_len) {
|
476 |
s->data_len -= s->usb_len; |
477 |
memset(s->usb_buf, 0, s->usb_len);
|
478 |
if (s->data_len == 0) |
479 |
s->mode = USB_MSDM_CSW; |
480 |
s->usb_len = 0;
|
481 |
} |
482 |
if (s->usb_len) {
|
483 |
DPRINTF("Deferring packet %p\n", p);
|
484 |
usb_defer_packet(p, usb_msd_cancel_io, s); |
485 |
s->packet = p; |
486 |
ret = USB_RET_ASYNC; |
487 |
} else {
|
488 |
ret = len; |
489 |
} |
490 |
break;
|
491 |
|
492 |
default:
|
493 |
DPRINTF("Unexpected read (len %d)\n", len);
|
494 |
goto fail;
|
495 |
} |
496 |
break;
|
497 |
|
498 |
default:
|
499 |
DPRINTF("Bad token\n");
|
500 |
fail:
|
501 |
ret = USB_RET_STALL; |
502 |
break;
|
503 |
} |
504 |
|
505 |
return ret;
|
506 |
} |
507 |
|
508 |
static void usb_msd_handle_destroy(USBDevice *dev) |
509 |
{ |
510 |
MSDState *s = (MSDState *)dev; |
511 |
|
512 |
s->scsi_dev->destroy(s->scsi_dev); |
513 |
bdrv_delete(s->bs); |
514 |
qemu_free(s); |
515 |
} |
516 |
|
517 |
static int usb_msd_initfn(USBDevice *dev) |
518 |
{ |
519 |
MSDState *s = DO_UPCAST(MSDState, dev, dev); |
520 |
|
521 |
s->dev.speed = USB_SPEED_FULL; |
522 |
return 0; |
523 |
} |
524 |
|
525 |
USBDevice *usb_msd_init(const char *filename) |
526 |
{ |
527 |
USBDevice *dev; |
528 |
MSDState *s; |
529 |
BlockDriverState *bdrv; |
530 |
BlockDriver *drv = NULL;
|
531 |
const char *p1; |
532 |
char fmt[32]; |
533 |
|
534 |
p1 = strchr(filename, ':');
|
535 |
if (p1++) {
|
536 |
const char *p2; |
537 |
|
538 |
if (strstart(filename, "format=", &p2)) { |
539 |
int len = MIN(p1 - p2, sizeof(fmt)); |
540 |
pstrcpy(fmt, len, p2); |
541 |
|
542 |
drv = bdrv_find_format(fmt); |
543 |
if (!drv) {
|
544 |
printf("invalid format %s\n", fmt);
|
545 |
return NULL; |
546 |
} |
547 |
} else if (*filename != ':') { |
548 |
printf("unrecognized USB mass-storage option %s\n", filename);
|
549 |
return NULL; |
550 |
} |
551 |
|
552 |
filename = p1; |
553 |
} |
554 |
|
555 |
if (!*filename) {
|
556 |
printf("block device specification needed\n");
|
557 |
return NULL; |
558 |
} |
559 |
|
560 |
bdrv = bdrv_new("usb");
|
561 |
if (bdrv_open2(bdrv, filename, 0, drv) < 0) |
562 |
return NULL; |
563 |
|
564 |
dev = usb_create_simple(NULL /* FIXME */, "QEMU USB MSD"); |
565 |
s = DO_UPCAST(MSDState, dev, dev); |
566 |
s->bs = bdrv; |
567 |
snprintf(s->dev.devname, sizeof(s->dev.devname), "QEMU USB MSD(%.16s)", |
568 |
filename); |
569 |
|
570 |
s->scsi_dev = scsi_disk_init(bdrv, 0, usb_msd_command_complete, s);
|
571 |
usb_msd_handle_reset((USBDevice *)s); |
572 |
return (USBDevice *)s;
|
573 |
} |
574 |
|
575 |
BlockDriverState *usb_msd_get_bdrv(USBDevice *dev) |
576 |
{ |
577 |
MSDState *s = (MSDState *)dev; |
578 |
|
579 |
return s->bs;
|
580 |
} |
581 |
|
582 |
static struct USBDeviceInfo msd_info = { |
583 |
.qdev.name = "QEMU USB MSD",
|
584 |
.qdev.size = sizeof(MSDState),
|
585 |
.init = usb_msd_initfn, |
586 |
.handle_packet = usb_generic_handle_packet, |
587 |
.handle_reset = usb_msd_handle_reset, |
588 |
.handle_control = usb_msd_handle_control, |
589 |
.handle_data = usb_msd_handle_data, |
590 |
.handle_destroy = usb_msd_handle_destroy, |
591 |
}; |
592 |
|
593 |
static void usb_msd_register_devices(void) |
594 |
{ |
595 |
usb_qdev_register(&msd_info); |
596 |
} |
597 |
device_init(usb_msd_register_devices) |