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qemu/hw/scsi/esp.c
Markus Armbruster fb8b660e17 hw/scsi: Concentrate -drive if=scsi auto-create in one place 
The logic to create frontends for -drive if=scsi is in SCSI HBAs.  For
all other interface types, it's in machine initialization code.

A few machine types create the SCSI HBAs necessary for that.  That's
also not done for other interface types.

I'm going to deprecate these SCSI eccentricities.  In preparation for
that, create the frontends in main() instead of the SCSI HBAs, by
calling new function scsi_legacy_handle_cmdline() there.

Note that not all SCSI HBAs create frontends.  Take care not to change
that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487161136-9018-2-git-send-email-armbru@redhat.com>
Acked-By: Paolo Bonzini <pbonzini@redhat.com>
2017-02-21 13:17:45 +01:00

746 lines
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/*
* QEMU ESP/NCR53C9x emulation
*
* Copyright (c) 2005-2006 Fabrice Bellard
* Copyright (c) 2012 Herve Poussineau
*
* 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/osdep.h"
#include "hw/sysbus.h"
#include "hw/scsi/esp.h"
#include "trace.h"
#include "qapi/error.h"
#include "qemu/log.h"
/*
* On Sparc32, this is the ESP (NCR53C90) part of chip STP2000 (Master I/O),
* also produced as NCR89C100. See
* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
* and
* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt
*/
static void esp_raise_irq(ESPState *s)
{
if (!(s->rregs[ESP_RSTAT] & STAT_INT)) {
s->rregs[ESP_RSTAT] |= STAT_INT;
qemu_irq_raise(s->irq);
trace_esp_raise_irq();
}
}
static void esp_lower_irq(ESPState *s)
{
if (s->rregs[ESP_RSTAT] & STAT_INT) {
s->rregs[ESP_RSTAT] &= ~STAT_INT;
qemu_irq_lower(s->irq);
trace_esp_lower_irq();
}
}
void esp_dma_enable(ESPState *s, int irq, int level)
{
if (level) {
s->dma_enabled = 1;
trace_esp_dma_enable();
if (s->dma_cb) {
s->dma_cb(s);
s->dma_cb = NULL;
}
} else {
trace_esp_dma_disable();
s->dma_enabled = 0;
}
}
void esp_request_cancelled(SCSIRequest *req)
{
ESPState *s = req->hba_private;
if (req == s->current_req) {
scsi_req_unref(s->current_req);
s->current_req = NULL;
s->current_dev = NULL;
}
}
static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
{
uint32_t dmalen;
int target;
target = s->wregs[ESP_WBUSID] & BUSID_DID;
if (s->dma) {
dmalen = s->rregs[ESP_TCLO];
dmalen |= s->rregs[ESP_TCMID] << 8;
dmalen |= s->rregs[ESP_TCHI] << 16;
if (dmalen > buflen) {
return 0;
}
s->dma_memory_read(s->dma_opaque, buf, dmalen);
} else {
dmalen = s->ti_size;
if (dmalen > TI_BUFSZ) {
return 0;
}
memcpy(buf, s->ti_buf, dmalen);
buf[0] = buf[2] >> 5;
}
trace_esp_get_cmd(dmalen, target);
s->ti_size = 0;
s->ti_rptr = 0;
s->ti_wptr = 0;
if (s->current_req) {
/* Started a new command before the old one finished. Cancel it. */
scsi_req_cancel(s->current_req);
s->async_len = 0;
}
s->current_dev = scsi_device_find(&s->bus, 0, target, 0);
if (!s->current_dev) {
// No such drive
s->rregs[ESP_RSTAT] = 0;
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = SEQ_0;
esp_raise_irq(s);
return 0;
}
return dmalen;
}
static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
{
int32_t datalen;
int lun;
SCSIDevice *current_lun;
trace_esp_do_busid_cmd(busid);
lun = busid & 7;
current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, lun);
s->current_req = scsi_req_new(current_lun, 0, lun, buf, s);
datalen = scsi_req_enqueue(s->current_req);
s->ti_size = datalen;
if (datalen != 0) {
s->rregs[ESP_RSTAT] = STAT_TC;
s->dma_left = 0;
s->dma_counter = 0;
if (datalen > 0) {
s->rregs[ESP_RSTAT] |= STAT_DI;
} else {
s->rregs[ESP_RSTAT] |= STAT_DO;
}
scsi_req_continue(s->current_req);
}
s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
esp_raise_irq(s);
}
static void do_cmd(ESPState *s, uint8_t *buf)
{
uint8_t busid = buf[0];
do_busid_cmd(s, &buf[1], busid);
}
static void handle_satn(ESPState *s)
{
uint8_t buf[32];
int len;
if (s->dma && !s->dma_enabled) {
s->dma_cb = handle_satn;
return;
}
len = get_cmd(s, buf, sizeof(buf));
if (len)
do_cmd(s, buf);
}
static void handle_s_without_atn(ESPState *s)
{
uint8_t buf[32];
int len;
if (s->dma && !s->dma_enabled) {
s->dma_cb = handle_s_without_atn;
return;
}
len = get_cmd(s, buf, sizeof(buf));
if (len) {
do_busid_cmd(s, buf, 0);
}
}
static void handle_satn_stop(ESPState *s)
{
if (s->dma && !s->dma_enabled) {
s->dma_cb = handle_satn_stop;
return;
}
s->cmdlen = get_cmd(s, s->cmdbuf, sizeof(s->cmdbuf));
if (s->cmdlen) {
trace_esp_handle_satn_stop(s->cmdlen);
s->do_cmd = 1;
s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD;
s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
esp_raise_irq(s);
}
}
static void write_response(ESPState *s)
{
trace_esp_write_response(s->status);
s->ti_buf[0] = s->status;
s->ti_buf[1] = 0;
if (s->dma) {
s->dma_memory_write(s->dma_opaque, s->ti_buf, 2);
s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
} else {
s->ti_size = 2;
s->ti_rptr = 0;
s->ti_wptr = 2;
s->rregs[ESP_RFLAGS] = 2;
}
esp_raise_irq(s);
}
static void esp_dma_done(ESPState *s)
{
s->rregs[ESP_RSTAT] |= STAT_TC;
s->rregs[ESP_RINTR] = INTR_BS;
s->rregs[ESP_RSEQ] = 0;
s->rregs[ESP_RFLAGS] = 0;
s->rregs[ESP_TCLO] = 0;
s->rregs[ESP_TCMID] = 0;
s->rregs[ESP_TCHI] = 0;
esp_raise_irq(s);
}
static void esp_do_dma(ESPState *s)
{
uint32_t len;
int to_device;
len = s->dma_left;
if (s->do_cmd) {
trace_esp_do_dma(s->cmdlen, len);
assert (s->cmdlen <= sizeof(s->cmdbuf) &&
len <= sizeof(s->cmdbuf) - s->cmdlen);
s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
return;
}
if (s->async_len == 0) {
/* Defer until data is available. */
return;
}
if (len > s->async_len) {
len = s->async_len;
}
to_device = (s->ti_size < 0);
if (to_device) {
s->dma_memory_read(s->dma_opaque, s->async_buf, len);
} else {
s->dma_memory_write(s->dma_opaque, s->async_buf, len);
}
s->dma_left -= len;
s->async_buf += len;
s->async_len -= len;
if (to_device)
s->ti_size += len;
else
s->ti_size -= len;
if (s->async_len == 0) {
scsi_req_continue(s->current_req);
/* If there is still data to be read from the device then
complete the DMA operation immediately. Otherwise defer
until the scsi layer has completed. */
if (to_device || s->dma_left != 0 || s->ti_size == 0) {
return;
}
}
/* Partially filled a scsi buffer. Complete immediately. */
esp_dma_done(s);
}
void esp_command_complete(SCSIRequest *req, uint32_t status,
size_t resid)
{
ESPState *s = req->hba_private;
trace_esp_command_complete();
if (s->ti_size != 0) {
trace_esp_command_complete_unexpected();
}
s->ti_size = 0;
s->dma_left = 0;
s->async_len = 0;
if (status) {
trace_esp_command_complete_fail();
}
s->status = status;
s->rregs[ESP_RSTAT] = STAT_ST;
esp_dma_done(s);
if (s->current_req) {
scsi_req_unref(s->current_req);
s->current_req = NULL;
s->current_dev = NULL;
}
}
void esp_transfer_data(SCSIRequest *req, uint32_t len)
{
ESPState *s = req->hba_private;
assert(!s->do_cmd);
trace_esp_transfer_data(s->dma_left, s->ti_size);
s->async_len = len;
s->async_buf = scsi_req_get_buf(req);
if (s->dma_left) {
esp_do_dma(s);
} else if (s->dma_counter != 0 && s->ti_size <= 0) {
/* If this was the last part of a DMA transfer then the
completion interrupt is deferred to here. */
esp_dma_done(s);
}
}
static void handle_ti(ESPState *s)
{
uint32_t dmalen, minlen;
if (s->dma && !s->dma_enabled) {
s->dma_cb = handle_ti;
return;
}
dmalen = s->rregs[ESP_TCLO];
dmalen |= s->rregs[ESP_TCMID] << 8;
dmalen |= s->rregs[ESP_TCHI] << 16;
if (dmalen==0) {
dmalen=0x10000;
}
s->dma_counter = dmalen;
if (s->do_cmd)
minlen = (dmalen < ESP_CMDBUF_SZ) ? dmalen : ESP_CMDBUF_SZ;
else if (s->ti_size < 0)
minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
else
minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
trace_esp_handle_ti(minlen);
if (s->dma) {
s->dma_left = minlen;
s->rregs[ESP_RSTAT] &= ~STAT_TC;
esp_do_dma(s);
}
if (s->do_cmd) {
trace_esp_handle_ti_cmd(s->cmdlen);
s->ti_size = 0;
s->cmdlen = 0;
s->do_cmd = 0;
do_cmd(s, s->cmdbuf);
}
}
void esp_hard_reset(ESPState *s)
{
memset(s->rregs, 0, ESP_REGS);
memset(s->wregs, 0, ESP_REGS);
s->tchi_written = 0;
s->ti_size = 0;
s->ti_rptr = 0;
s->ti_wptr = 0;
s->dma = 0;
s->do_cmd = 0;
s->dma_cb = NULL;
s->rregs[ESP_CFG1] = 7;
}
static void esp_soft_reset(ESPState *s)
{
qemu_irq_lower(s->irq);
esp_hard_reset(s);
}
static void parent_esp_reset(ESPState *s, int irq, int level)
{
if (level) {
esp_soft_reset(s);
}
}
uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
{
uint32_t old_val;
trace_esp_mem_readb(saddr, s->rregs[saddr]);
switch (saddr) {
case ESP_FIFO:
if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
/* Data out. */
qemu_log_mask(LOG_UNIMP, "esp: PIO data read not implemented\n");
s->rregs[ESP_FIFO] = 0;
} else if (s->ti_rptr < s->ti_wptr) {
s->ti_size--;
s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
}
if (s->ti_rptr == s->ti_wptr) {
s->ti_rptr = 0;
s->ti_wptr = 0;
}
break;
case ESP_RINTR:
/* Clear sequence step, interrupt register and all status bits
except TC */
old_val = s->rregs[ESP_RINTR];
s->rregs[ESP_RINTR] = 0;
s->rregs[ESP_RSTAT] &= ~STAT_TC;
s->rregs[ESP_RSEQ] = SEQ_CD;
esp_lower_irq(s);
return old_val;
case ESP_TCHI:
/* Return the unique id if the value has never been written */
if (!s->tchi_written) {
return s->chip_id;
}
default:
break;
}
return s->rregs[saddr];
}
void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
{
trace_esp_mem_writeb(saddr, s->wregs[saddr], val);
switch (saddr) {
case ESP_TCHI:
s->tchi_written = true;
/* fall through */
case ESP_TCLO:
case ESP_TCMID:
s->rregs[ESP_RSTAT] &= ~STAT_TC;
break;
case ESP_FIFO:
if (s->do_cmd) {
if (s->cmdlen < ESP_CMDBUF_SZ) {
s->cmdbuf[s->cmdlen++] = val & 0xff;
} else {
trace_esp_error_fifo_overrun();
}
} else if (s->ti_wptr == TI_BUFSZ - 1) {
trace_esp_error_fifo_overrun();
} else {
s->ti_size++;
s->ti_buf[s->ti_wptr++] = val & 0xff;
}
break;
case ESP_CMD:
s->rregs[saddr] = val;
if (val & CMD_DMA) {
s->dma = 1;
/* Reload DMA counter. */
s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
s->rregs[ESP_TCHI] = s->wregs[ESP_TCHI];
} else {
s->dma = 0;
}
switch(val & CMD_CMD) {
case CMD_NOP:
trace_esp_mem_writeb_cmd_nop(val);
break;
case CMD_FLUSH:
trace_esp_mem_writeb_cmd_flush(val);
//s->ti_size = 0;
s->rregs[ESP_RINTR] = INTR_FC;
s->rregs[ESP_RSEQ] = 0;
s->rregs[ESP_RFLAGS] = 0;
break;
case CMD_RESET:
trace_esp_mem_writeb_cmd_reset(val);
esp_soft_reset(s);
break;
case CMD_BUSRESET:
trace_esp_mem_writeb_cmd_bus_reset(val);
s->rregs[ESP_RINTR] = INTR_RST;
if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
esp_raise_irq(s);
}
break;
case CMD_TI:
handle_ti(s);
break;
case CMD_ICCS:
trace_esp_mem_writeb_cmd_iccs(val);
write_response(s);
s->rregs[ESP_RINTR] = INTR_FC;
s->rregs[ESP_RSTAT] |= STAT_MI;
break;
case CMD_MSGACC:
trace_esp_mem_writeb_cmd_msgacc(val);
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = 0;
s->rregs[ESP_RFLAGS] = 0;
esp_raise_irq(s);
break;
case CMD_PAD:
trace_esp_mem_writeb_cmd_pad(val);
s->rregs[ESP_RSTAT] = STAT_TC;
s->rregs[ESP_RINTR] = INTR_FC;
s->rregs[ESP_RSEQ] = 0;
break;
case CMD_SATN:
trace_esp_mem_writeb_cmd_satn(val);
break;
case CMD_RSTATN:
trace_esp_mem_writeb_cmd_rstatn(val);
break;
case CMD_SEL:
trace_esp_mem_writeb_cmd_sel(val);
handle_s_without_atn(s);
break;
case CMD_SELATN:
trace_esp_mem_writeb_cmd_selatn(val);
handle_satn(s);
break;
case CMD_SELATNS:
trace_esp_mem_writeb_cmd_selatns(val);
handle_satn_stop(s);
break;
case CMD_ENSEL:
trace_esp_mem_writeb_cmd_ensel(val);
s->rregs[ESP_RINTR] = 0;
break;
case CMD_DISSEL:
trace_esp_mem_writeb_cmd_dissel(val);
s->rregs[ESP_RINTR] = 0;
esp_raise_irq(s);
break;
default:
trace_esp_error_unhandled_command(val);
break;
}
break;
case ESP_WBUSID ... ESP_WSYNO:
break;
case ESP_CFG1:
case ESP_CFG2: case ESP_CFG3:
case ESP_RES3: case ESP_RES4:
s->rregs[saddr] = val;
break;
case ESP_WCCF ... ESP_WTEST:
break;
default:
trace_esp_error_invalid_write(val, saddr);
return;
}
s->wregs[saddr] = val;
}
static bool esp_mem_accepts(void *opaque, hwaddr addr,
unsigned size, bool is_write)
{
return (size == 1) || (is_write && size == 4);
}
const VMStateDescription vmstate_esp = {
.name ="esp",
.version_id = 4,
.minimum_version_id = 3,
.fields = (VMStateField[]) {
VMSTATE_BUFFER(rregs, ESPState),
VMSTATE_BUFFER(wregs, ESPState),
VMSTATE_INT32(ti_size, ESPState),
VMSTATE_UINT32(ti_rptr, ESPState),
VMSTATE_UINT32(ti_wptr, ESPState),
VMSTATE_BUFFER(ti_buf, ESPState),
VMSTATE_UINT32(status, ESPState),
VMSTATE_UINT32(dma, ESPState),
VMSTATE_PARTIAL_BUFFER(cmdbuf, ESPState, 16),
VMSTATE_BUFFER_START_MIDDLE_V(cmdbuf, ESPState, 16, 4),
VMSTATE_UINT32(cmdlen, ESPState),
VMSTATE_UINT32(do_cmd, ESPState),
VMSTATE_UINT32(dma_left, ESPState),
VMSTATE_END_OF_LIST()
}
};
#define TYPE_ESP "esp"
#define ESP(obj) OBJECT_CHECK(SysBusESPState, (obj), TYPE_ESP)
typedef struct {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion iomem;
uint32_t it_shift;
ESPState esp;
} SysBusESPState;
static void sysbus_esp_mem_write(void *opaque, hwaddr addr,
uint64_t val, unsigned int size)
{
SysBusESPState *sysbus = opaque;
uint32_t saddr;
saddr = addr >> sysbus->it_shift;
esp_reg_write(&sysbus->esp, saddr, val);
}
static uint64_t sysbus_esp_mem_read(void *opaque, hwaddr addr,
unsigned int size)
{
SysBusESPState *sysbus = opaque;
uint32_t saddr;
saddr = addr >> sysbus->it_shift;
return esp_reg_read(&sysbus->esp, saddr);
}
static const MemoryRegionOps sysbus_esp_mem_ops = {
.read = sysbus_esp_mem_read,
.write = sysbus_esp_mem_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.accepts = esp_mem_accepts,
};
void esp_init(hwaddr espaddr, int it_shift,
ESPDMAMemoryReadWriteFunc dma_memory_read,
ESPDMAMemoryReadWriteFunc dma_memory_write,
void *dma_opaque, qemu_irq irq, qemu_irq *reset,
qemu_irq *dma_enable)
{
DeviceState *dev;
SysBusDevice *s;
SysBusESPState *sysbus;
ESPState *esp;
dev = qdev_create(NULL, TYPE_ESP);
sysbus = ESP(dev);
esp = &sysbus->esp;
esp->dma_memory_read = dma_memory_read;
esp->dma_memory_write = dma_memory_write;
esp->dma_opaque = dma_opaque;
sysbus->it_shift = it_shift;
/* XXX for now until rc4030 has been changed to use DMA enable signal */
esp->dma_enabled = 1;
qdev_init_nofail(dev);
s = SYS_BUS_DEVICE(dev);
sysbus_connect_irq(s, 0, irq);
sysbus_mmio_map(s, 0, espaddr);
*reset = qdev_get_gpio_in(dev, 0);
*dma_enable = qdev_get_gpio_in(dev, 1);
}
static const struct SCSIBusInfo esp_scsi_info = {
.tcq = false,
.max_target = ESP_MAX_DEVS,
.max_lun = 7,
.transfer_data = esp_transfer_data,
.complete = esp_command_complete,
.cancel = esp_request_cancelled
};
static void sysbus_esp_gpio_demux(void *opaque, int irq, int level)
{
SysBusESPState *sysbus = ESP(opaque);
ESPState *s = &sysbus->esp;
switch (irq) {
case 0:
parent_esp_reset(s, irq, level);
break;
case 1:
esp_dma_enable(opaque, irq, level);
break;
}
}
static void sysbus_esp_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
SysBusESPState *sysbus = ESP(dev);
ESPState *s = &sysbus->esp;
sysbus_init_irq(sbd, &s->irq);
assert(sysbus->it_shift != -1);
s->chip_id = TCHI_FAS100A;
memory_region_init_io(&sysbus->iomem, OBJECT(sysbus), &sysbus_esp_mem_ops,
sysbus, "esp", ESP_REGS << sysbus->it_shift);
sysbus_init_mmio(sbd, &sysbus->iomem);
qdev_init_gpio_in(dev, sysbus_esp_gpio_demux, 2);
scsi_bus_new(&s->bus, sizeof(s->bus), dev, &esp_scsi_info, NULL);
}
static void sysbus_esp_hard_reset(DeviceState *dev)
{
SysBusESPState *sysbus = ESP(dev);
esp_hard_reset(&sysbus->esp);
}
static const VMStateDescription vmstate_sysbus_esp_scsi = {
.name = "sysbusespscsi",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_STRUCT(esp, SysBusESPState, 0, vmstate_esp, ESPState),
VMSTATE_END_OF_LIST()
}
};
static void sysbus_esp_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = sysbus_esp_realize;
dc->reset = sysbus_esp_hard_reset;
dc->vmsd = &vmstate_sysbus_esp_scsi;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
}
static const TypeInfo sysbus_esp_info = {
.name = TYPE_ESP,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(SysBusESPState),
.class_init = sysbus_esp_class_init,
};
static void esp_register_types(void)
{
type_register_static(&sysbus_esp_info);
}
type_init(esp_register_types)
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