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xemu/hw/pci-host/q35.c
Markus Armbruster a0efbf1660 range: Eliminate direct Range member access 
Users of struct Range mess liberally with its members, which makes
refactoring hard.  Create a set of methods, and convert all users to
call them instead of accessing members.  The methods have carefully
worded contracts, and use assertions to check them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-04 16:49:33 +03:00

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/*
* QEMU MCH/ICH9 PCI Bridge Emulation
*
* Copyright (c) 2006 Fabrice Bellard
* Copyright (c) 2009, 2010, 2011
* Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
* Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
*
* This is based on piix.c, but heavily modified.
*
* 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/hw.h"
#include "hw/pci-host/q35.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
/****************************************************************************
* Q35 host
*/
static void q35_host_realize(DeviceState *dev, Error **errp)
{
PCIHostState *pci = PCI_HOST_BRIDGE(dev);
Q35PCIHost *s = Q35_HOST_DEVICE(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);
sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);
pci->bus = pci_bus_new(DEVICE(s), "pcie.0",
s->mch.pci_address_space, s->mch.address_space_io,
0, TYPE_PCIE_BUS);
PC_MACHINE(qdev_get_machine())->bus = pci->bus;
qdev_set_parent_bus(DEVICE(&s->mch), BUS(pci->bus));
qdev_init_nofail(DEVICE(&s->mch));
}
static const char *q35_host_root_bus_path(PCIHostState *host_bridge,
PCIBus *rootbus)
{
Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);
/* For backwards compat with old device paths */
if (s->mch.short_root_bus) {
return "0000";
}
return "0000:00";
}
static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
uint64_t val64;
uint32_t value;
val64 = range_is_empty(&s->mch.pci_hole)
? 0 : range_lob(&s->mch.pci_hole);
value = val64;
assert(value == val64);
visit_type_uint32(v, name, &value, errp);
}
static void q35_host_get_pci_hole_end(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
uint64_t val64;
uint32_t value;
val64 = range_is_empty(&s->mch.pci_hole)
? 0 : range_upb(&s->mch.pci_hole) + 1;
value = val64;
assert(value == val64);
visit_type_uint32(v, name, &value, errp);
}
static void q35_host_get_pci_hole64_start(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
PCIHostState *h = PCI_HOST_BRIDGE(obj);
Range w64;
uint64_t value;
pci_bus_get_w64_range(h->bus, &w64);
value = range_is_empty(&w64) ? 0 : range_lob(&w64);
visit_type_uint64(v, name, &value, errp);
}
static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
PCIHostState *h = PCI_HOST_BRIDGE(obj);
Range w64;
uint64_t value;
pci_bus_get_w64_range(h->bus, &w64);
value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1;
visit_type_uint64(v, name, &value, errp);
}
static void q35_host_get_mmcfg_size(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
uint32_t value = e->size;
visit_type_uint32(v, name, &value, errp);
}
static Property mch_props[] = {
DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
mch.pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),
DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
DEFINE_PROP_SIZE(PCI_HOST_BELOW_4G_MEM_SIZE, Q35PCIHost,
mch.below_4g_mem_size, 0),
DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MEM_SIZE, Q35PCIHost,
mch.above_4g_mem_size, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void q35_host_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
hc->root_bus_path = q35_host_root_bus_path;
dc->realize = q35_host_realize;
dc->props = mch_props;
/* Reason: needs to be wired up by pc_q35_init */
dc->cannot_instantiate_with_device_add_yet = true;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->fw_name = "pci";
}
static void q35_host_initfn(Object *obj)
{
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
PCIHostState *phb = PCI_HOST_BRIDGE(obj);
memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
"pci-conf-idx", 4);
memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
"pci-conf-data", 4);
object_initialize(&s->mch, sizeof(s->mch), TYPE_MCH_PCI_DEVICE);
object_property_add_child(OBJECT(s), "mch", OBJECT(&s->mch), NULL);
qdev_prop_set_uint32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
q35_host_get_pci_hole_start,
NULL, NULL, NULL, NULL);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "int",
q35_host_get_pci_hole_end,
NULL, NULL, NULL, NULL);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "int",
q35_host_get_pci_hole64_start,
NULL, NULL, NULL, NULL);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "int",
q35_host_get_pci_hole64_end,
NULL, NULL, NULL, NULL);
object_property_add(obj, PCIE_HOST_MCFG_SIZE, "int",
q35_host_get_mmcfg_size,
NULL, NULL, NULL, NULL);
object_property_add_link(obj, MCH_HOST_PROP_RAM_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.ram_memory,
qdev_prop_allow_set_link_before_realize, 0, NULL);
object_property_add_link(obj, MCH_HOST_PROP_PCI_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.pci_address_space,
qdev_prop_allow_set_link_before_realize, 0, NULL);
object_property_add_link(obj, MCH_HOST_PROP_SYSTEM_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.system_memory,
qdev_prop_allow_set_link_before_realize, 0, NULL);
object_property_add_link(obj, MCH_HOST_PROP_IO_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.address_space_io,
qdev_prop_allow_set_link_before_realize, 0, NULL);
/* Leave enough space for the biggest MCFG BAR */
/* TODO: this matches current bios behaviour, but
* it's not a power of two, which means an MTRR
* can't cover it exactly.
*/
range_set_bounds(&s->mch.pci_hole,
MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT + MCH_HOST_BRIDGE_PCIEXBAR_MAX,
IO_APIC_DEFAULT_ADDRESS - 1);
}
static const TypeInfo q35_host_info = {
.name = TYPE_Q35_HOST_DEVICE,
.parent = TYPE_PCIE_HOST_BRIDGE,
.instance_size = sizeof(Q35PCIHost),
.instance_init = q35_host_initfn,
.class_init = q35_host_class_init,
};
/****************************************************************************
* MCH D0:F0
*/
static uint64_t tseg_blackhole_read(void *ptr, hwaddr reg, unsigned size)
{
return 0xffffffff;
}
static void tseg_blackhole_write(void *opaque, hwaddr addr, uint64_t val,
unsigned width)
{
/* nothing */
}
static const MemoryRegionOps tseg_blackhole_ops = {
.read = tseg_blackhole_read,
.write = tseg_blackhole_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
.impl.min_access_size = 4,
.impl.max_access_size = 4,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/* PCIe MMCFG */
static void mch_update_pciexbar(MCHPCIState *mch)
{
PCIDevice *pci_dev = PCI_DEVICE(mch);
BusState *bus = qdev_get_parent_bus(DEVICE(mch));
PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);
uint64_t pciexbar;
int enable;
uint64_t addr;
uint64_t addr_mask;
uint32_t length;
pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
length = 256 * 1024 * 1024;
break;
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
length = 128 * 1024 * 1024;
addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK |
MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
break;
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
length = 64 * 1024 * 1024;
addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
break;
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
default:
abort();
}
addr = pciexbar & addr_mask;
pcie_host_mmcfg_update(pehb, enable, addr, length);
/* Leave enough space for the MCFG BAR */
/*
* TODO: this matches current bios behaviour, but it's not a power of two,
* which means an MTRR can't cover it exactly.
*/
if (enable) {
range_set_bounds(&mch->pci_hole,
addr + length,
IO_APIC_DEFAULT_ADDRESS - 1);
} else {
range_set_bounds(&mch->pci_hole,
MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT,
IO_APIC_DEFAULT_ADDRESS - 1);
}
}
/* PAM */
static void mch_update_pam(MCHPCIState *mch)
{
PCIDevice *pd = PCI_DEVICE(mch);
int i;
memory_region_transaction_begin();
for (i = 0; i < 13; i++) {
pam_update(&mch->pam_regions[i], i,
pd->config[MCH_HOST_BRIDGE_PAM0 + ((i + 1) / 2)]);
}
memory_region_transaction_commit();
}
/* SMRAM */
static void mch_update_smram(MCHPCIState *mch)
{
PCIDevice *pd = PCI_DEVICE(mch);
bool h_smrame = (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_H_SMRAME);
uint32_t tseg_size;
/* implement SMRAM.D_LCK */
if (pd->config[MCH_HOST_BRIDGE_SMRAM] & MCH_HOST_BRIDGE_SMRAM_D_LCK) {
pd->config[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_OPEN;
pd->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK_LCK;
pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK_LCK;
}
memory_region_transaction_begin();
if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_D_OPEN) {
/* Hide (!) low SMRAM if H_SMRAME = 1 */
memory_region_set_enabled(&mch->smram_region, h_smrame);
/* Show high SMRAM if H_SMRAME = 1 */
memory_region_set_enabled(&mch->open_high_smram, h_smrame);
} else {
/* Hide high SMRAM and low SMRAM */
memory_region_set_enabled(&mch->smram_region, true);
memory_region_set_enabled(&mch->open_high_smram, false);
}
if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_G_SMRAME) {
memory_region_set_enabled(&mch->low_smram, !h_smrame);
memory_region_set_enabled(&mch->high_smram, h_smrame);
} else {
memory_region_set_enabled(&mch->low_smram, false);
memory_region_set_enabled(&mch->high_smram, false);
}
if (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_T_EN) {
switch (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &
MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_1MB:
tseg_size = 1024 * 1024;
break;
case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_2MB:
tseg_size = 1024 * 1024 * 2;
break;
case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_8MB:
tseg_size = 1024 * 1024 * 8;
break;
default:
tseg_size = 0;
break;
}
} else {
tseg_size = 0;
}
memory_region_del_subregion(mch->system_memory, &mch->tseg_blackhole);
memory_region_set_enabled(&mch->tseg_blackhole, tseg_size);
memory_region_set_size(&mch->tseg_blackhole, tseg_size);
memory_region_add_subregion_overlap(mch->system_memory,
mch->below_4g_mem_size - tseg_size,
&mch->tseg_blackhole, 1);
memory_region_set_enabled(&mch->tseg_window, tseg_size);
memory_region_set_size(&mch->tseg_window, tseg_size);
memory_region_set_address(&mch->tseg_window,
mch->below_4g_mem_size - tseg_size);
memory_region_set_alias_offset(&mch->tseg_window,
mch->below_4g_mem_size - tseg_size);
memory_region_transaction_commit();
}
static void mch_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)
{
MCHPCIState *mch = MCH_PCI_DEVICE(d);
pci_default_write_config(d, address, val, len);
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
MCH_HOST_BRIDGE_PAM_SIZE)) {
mch_update_pam(mch);
}
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
mch_update_pciexbar(mch);
}
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
MCH_HOST_BRIDGE_SMRAM_SIZE)) {
mch_update_smram(mch);
}
}
static void mch_update(MCHPCIState *mch)
{
mch_update_pciexbar(mch);
mch_update_pam(mch);
mch_update_smram(mch);
}
static int mch_post_load(void *opaque, int version_id)
{
MCHPCIState *mch = opaque;
mch_update(mch);
return 0;
}
static const VMStateDescription vmstate_mch = {
.name = "mch",
.version_id = 1,
.minimum_version_id = 1,
.post_load = mch_post_load,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
/* Used to be smm_enabled, which was basically always zero because
* SeaBIOS hardly uses SMM. SMRAM is now handled by CPU code.
*/
VMSTATE_UNUSED(1),
VMSTATE_END_OF_LIST()
}
};
static void mch_reset(DeviceState *qdev)
{
PCIDevice *d = PCI_DEVICE(qdev);
MCHPCIState *mch = MCH_PCI_DEVICE(d);
pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
d->config[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_DEFAULT;
d->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK;
d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK;
mch_update(mch);
}
static void mch_realize(PCIDevice *d, Error **errp)
{
int i;
MCHPCIState *mch = MCH_PCI_DEVICE(d);
/* setup pci memory mapping */
pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
mch->pci_address_space);
/* if *disabled* show SMRAM to all CPUs */
memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
mch->pci_address_space, 0xa0000, 0x20000);
memory_region_add_subregion_overlap(mch->system_memory, 0xa0000,
&mch->smram_region, 1);
memory_region_set_enabled(&mch->smram_region, true);
memory_region_init_alias(&mch->open_high_smram, OBJECT(mch), "smram-open-high",
mch->ram_memory, 0xa0000, 0x20000);
memory_region_add_subregion_overlap(mch->system_memory, 0xfeda0000,
&mch->open_high_smram, 1);
memory_region_set_enabled(&mch->open_high_smram, false);
/* smram, as seen by SMM CPUs */
memory_region_init(&mch->smram, OBJECT(mch), "smram", 1ull << 32);
memory_region_set_enabled(&mch->smram, true);
memory_region_init_alias(&mch->low_smram, OBJECT(mch), "smram-low",
mch->ram_memory, 0xa0000, 0x20000);
memory_region_set_enabled(&mch->low_smram, true);
memory_region_add_subregion(&mch->smram, 0xa0000, &mch->low_smram);
memory_region_init_alias(&mch->high_smram, OBJECT(mch), "smram-high",
mch->ram_memory, 0xa0000, 0x20000);
memory_region_set_enabled(&mch->high_smram, true);
memory_region_add_subregion(&mch->smram, 0xfeda0000, &mch->high_smram);
memory_region_init_io(&mch->tseg_blackhole, OBJECT(mch),
&tseg_blackhole_ops, NULL,
"tseg-blackhole", 0);
memory_region_set_enabled(&mch->tseg_blackhole, false);
memory_region_add_subregion_overlap(mch->system_memory,
mch->below_4g_mem_size,
&mch->tseg_blackhole, 1);
memory_region_init_alias(&mch->tseg_window, OBJECT(mch), "tseg-window",
mch->ram_memory, mch->below_4g_mem_size, 0);
memory_region_set_enabled(&mch->tseg_window, false);
memory_region_add_subregion(&mch->smram, mch->below_4g_mem_size,
&mch->tseg_window);
object_property_add_const_link(qdev_get_machine(), "smram",
OBJECT(&mch->smram), &error_abort);
init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
mch->pci_address_space, &mch->pam_regions[0],
PAM_BIOS_BASE, PAM_BIOS_SIZE);
for (i = 0; i < 12; ++i) {
init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
mch->pci_address_space, &mch->pam_regions[i+1],
PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);
}
}
uint64_t mch_mcfg_base(void)
{
bool ambiguous;
Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
if (!o) {
return 0;
}
return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
}
static void mch_class_init(ObjectClass *klass, void *data)
{
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
k->realize = mch_realize;
k->config_write = mch_write_config;
dc->reset = mch_reset;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->desc = "Host bridge";
dc->vmsd = &vmstate_mch;
k->vendor_id = PCI_VENDOR_ID_INTEL;
k->device_id = PCI_DEVICE_ID_INTEL_Q35_MCH;
k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
k->class_id = PCI_CLASS_BRIDGE_HOST;
/*
* PCI-facing part of the host bridge, not usable without the
* host-facing part, which can't be device_add'ed, yet.
*/
dc->cannot_instantiate_with_device_add_yet = true;
}
static const TypeInfo mch_info = {
.name = TYPE_MCH_PCI_DEVICE,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(MCHPCIState),
.class_init = mch_class_init,
};
static void q35_register(void)
{
type_register_static(&mch_info);
type_register_static(&q35_host_info);
}
type_init(q35_register);
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