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qemu/hw/net/opencores_eth.c

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/*
* OpenCores Ethernet MAC 10/100 + subset of
* National Semiconductors DP83848C 10/100 PHY
*
* http://opencores.org/svnget,ethmac?file=%2Ftrunk%2F%2Fdoc%2Feth_speci.pdf
* http://cache.national.com/ds/DP/DP83848C.pdf
*
* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Open Source and Linux Lab nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "hw/hw.h"
#include "hw/sysbus.h"
#include "net/net.h"
#include "sysemu/sysemu.h"
#include "trace.h"
/* RECSMALL is not used because it breaks tap networking in linux:
* incoming ARP responses are too short
*/
#undef USE_RECSMALL
#define GET_FIELD(v, field) (((v) & (field)) >> (field ## _LBN))
#define GET_REGBIT(s, reg, field) ((s)->regs[reg] & (reg ## _ ## field))
#define GET_REGFIELD(s, reg, field) \
GET_FIELD((s)->regs[reg], reg ## _ ## field)
#define SET_FIELD(v, field, data) \
((v) = (((v) & ~(field)) | (((data) << (field ## _LBN)) & (field))))
#define SET_REGFIELD(s, reg, field, data) \
SET_FIELD((s)->regs[reg], reg ## _ ## field, data)
/* PHY MII registers */
enum {
MII_BMCR,
MII_BMSR,
MII_PHYIDR1,
MII_PHYIDR2,
MII_ANAR,
MII_ANLPAR,
MII_REG_MAX = 16,
};
typedef struct Mii {
uint16_t regs[MII_REG_MAX];
bool link_ok;
} Mii;
static void mii_set_link(Mii *s, bool link_ok)
{
if (link_ok) {
s->regs[MII_BMSR] |= 0x4;
s->regs[MII_ANLPAR] |= 0x01e1;
} else {
s->regs[MII_BMSR] &= ~0x4;
s->regs[MII_ANLPAR] &= 0x01ff;
}
s->link_ok = link_ok;
}
static void mii_reset(Mii *s)
{
memset(s->regs, 0, sizeof(s->regs));
s->regs[MII_BMCR] = 0x1000;
s->regs[MII_BMSR] = 0x7848; /* no ext regs */
s->regs[MII_PHYIDR1] = 0x2000;
s->regs[MII_PHYIDR2] = 0x5c90;
s->regs[MII_ANAR] = 0x01e1;
mii_set_link(s, s->link_ok);
}
static void mii_ro(Mii *s, uint16_t v)
{
}
static void mii_write_bmcr(Mii *s, uint16_t v)
{
if (v & 0x8000) {
mii_reset(s);
} else {
s->regs[MII_BMCR] = v;
}
}
static void mii_write_host(Mii *s, unsigned idx, uint16_t v)
{
static void (*reg_write[MII_REG_MAX])(Mii *s, uint16_t v) = {
[MII_BMCR] = mii_write_bmcr,
[MII_BMSR] = mii_ro,
[MII_PHYIDR1] = mii_ro,
[MII_PHYIDR2] = mii_ro,
};
if (idx < MII_REG_MAX) {
trace_open_eth_mii_write(idx, v);
if (reg_write[idx]) {
reg_write[idx](s, v);
} else {
s->regs[idx] = v;
}
}
}
static uint16_t mii_read_host(Mii *s, unsigned idx)
{
trace_open_eth_mii_read(idx, s->regs[idx]);
return s->regs[idx];
}
/* OpenCores Ethernet registers */
enum {
MODER,
INT_SOURCE,
INT_MASK,
IPGT,
IPGR1,
IPGR2,
PACKETLEN,
COLLCONF,
TX_BD_NUM,
CTRLMODER,
MIIMODER,
MIICOMMAND,
MIIADDRESS,
MIITX_DATA,
MIIRX_DATA,
MIISTATUS,
MAC_ADDR0,
MAC_ADDR1,
HASH0,
HASH1,
TXCTRL,
REG_MAX,
};
enum {
MODER_RECSMALL = 0x10000,
MODER_PAD = 0x8000,
MODER_HUGEN = 0x4000,
MODER_RST = 0x800,
MODER_LOOPBCK = 0x80,
MODER_PRO = 0x20,
MODER_IAM = 0x10,
MODER_BRO = 0x8,
MODER_TXEN = 0x2,
MODER_RXEN = 0x1,
};
enum {
INT_SOURCE_RXB = 0x4,
INT_SOURCE_TXB = 0x1,
};
enum {
PACKETLEN_MINFL = 0xffff0000,
PACKETLEN_MINFL_LBN = 16,
PACKETLEN_MAXFL = 0xffff,
PACKETLEN_MAXFL_LBN = 0,
};
enum {
MIICOMMAND_WCTRLDATA = 0x4,
MIICOMMAND_RSTAT = 0x2,
MIICOMMAND_SCANSTAT = 0x1,
};
enum {
MIIADDRESS_RGAD = 0x1f00,
MIIADDRESS_RGAD_LBN = 8,
MIIADDRESS_FIAD = 0x1f,
MIIADDRESS_FIAD_LBN = 0,
};
enum {
MIITX_DATA_CTRLDATA = 0xffff,
MIITX_DATA_CTRLDATA_LBN = 0,
};
enum {
MIIRX_DATA_PRSD = 0xffff,
MIIRX_DATA_PRSD_LBN = 0,
};
enum {
MIISTATUS_LINKFAIL = 0x1,
MIISTATUS_LINKFAIL_LBN = 0,
};
enum {
MAC_ADDR0_BYTE2 = 0xff000000,
MAC_ADDR0_BYTE2_LBN = 24,
MAC_ADDR0_BYTE3 = 0xff0000,
MAC_ADDR0_BYTE3_LBN = 16,
MAC_ADDR0_BYTE4 = 0xff00,
MAC_ADDR0_BYTE4_LBN = 8,
MAC_ADDR0_BYTE5 = 0xff,
MAC_ADDR0_BYTE5_LBN = 0,
};
enum {
MAC_ADDR1_BYTE0 = 0xff00,
MAC_ADDR1_BYTE0_LBN = 8,
MAC_ADDR1_BYTE1 = 0xff,
MAC_ADDR1_BYTE1_LBN = 0,
};
enum {
TXD_LEN = 0xffff0000,
TXD_LEN_LBN = 16,
TXD_RD = 0x8000,
TXD_IRQ = 0x4000,
TXD_WR = 0x2000,
TXD_PAD = 0x1000,
TXD_CRC = 0x800,
TXD_UR = 0x100,
TXD_RTRY = 0xf0,
TXD_RTRY_LBN = 4,
TXD_RL = 0x8,
TXD_LC = 0x4,
TXD_DF = 0x2,
TXD_CS = 0x1,
};
enum {
RXD_LEN = 0xffff0000,
RXD_LEN_LBN = 16,
RXD_E = 0x8000,
RXD_IRQ = 0x4000,
RXD_WRAP = 0x2000,
RXD_CF = 0x100,
RXD_M = 0x80,
RXD_OR = 0x40,
RXD_IS = 0x20,
RXD_DN = 0x10,
RXD_TL = 0x8,
RXD_SF = 0x4,
RXD_CRC = 0x2,
RXD_LC = 0x1,
};
typedef struct desc {
uint32_t len_flags;
uint32_t buf_ptr;
} desc;
#define DEFAULT_PHY 1
#define TYPE_OPEN_ETH "open_eth"
#define OPEN_ETH(obj) OBJECT_CHECK(OpenEthState, (obj), TYPE_OPEN_ETH)
typedef struct OpenEthState {
SysBusDevice parent_obj;
NICState *nic;
NICConf conf;
MemoryRegion reg_io;
MemoryRegion desc_io;
qemu_irq irq;
Mii mii;
uint32_t regs[REG_MAX];
unsigned tx_desc;
unsigned rx_desc;
desc desc[128];
} OpenEthState;
static desc *rx_desc(OpenEthState *s)
{
return s->desc + s->rx_desc;
}
static desc *tx_desc(OpenEthState *s)
{
return s->desc + s->tx_desc;
}
static void open_eth_update_irq(OpenEthState *s,
uint32_t old, uint32_t new)
{
if (!old != !new) {
trace_open_eth_update_irq(new);
qemu_set_irq(s->irq, new);
}
}
static void open_eth_int_source_write(OpenEthState *s,
uint32_t val)
{
uint32_t old_val = s->regs[INT_SOURCE];
s->regs[INT_SOURCE] = val;
open_eth_update_irq(s, old_val & s->regs[INT_MASK],
s->regs[INT_SOURCE] & s->regs[INT_MASK]);
}
static void open_eth_set_link_status(NetClientState *nc)
{
OpenEthState *s = qemu_get_nic_opaque(nc);
if (GET_REGBIT(s, MIICOMMAND, SCANSTAT)) {
SET_REGFIELD(s, MIISTATUS, LINKFAIL, nc->link_down);
}
mii_set_link(&s->mii, !nc->link_down);
}
static void open_eth_reset(void *opaque)
{
OpenEthState *s = opaque;
memset(s->regs, 0, sizeof(s->regs));
s->regs[MODER] = 0xa000;
s->regs[IPGT] = 0x12;
s->regs[IPGR1] = 0xc;
s->regs[IPGR2] = 0x12;
s->regs[PACKETLEN] = 0x400600;
s->regs[COLLCONF] = 0xf003f;
s->regs[TX_BD_NUM] = 0x40;
s->regs[MIIMODER] = 0x64;
s->tx_desc = 0;
s->rx_desc = 0x40;
mii_reset(&s->mii);
open_eth_set_link_status(qemu_get_queue(s->nic));
}
static int open_eth_can_receive(NetClientState *nc)
{
OpenEthState *s = qemu_get_nic_opaque(nc);
return GET_REGBIT(s, MODER, RXEN) &&
(s->regs[TX_BD_NUM] < 0x80) &&
(rx_desc(s)->len_flags & RXD_E);
}
static ssize_t open_eth_receive(NetClientState *nc,
const uint8_t *buf, size_t size)
{
OpenEthState *s = qemu_get_nic_opaque(nc);
size_t maxfl = GET_REGFIELD(s, PACKETLEN, MAXFL);
size_t minfl = GET_REGFIELD(s, PACKETLEN, MINFL);
size_t fcsl = 4;
bool miss = true;
trace_open_eth_receive((unsigned)size);
if (size >= 6) {
static const uint8_t bcast_addr[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
if (memcmp(buf, bcast_addr, sizeof(bcast_addr)) == 0) {
miss = GET_REGBIT(s, MODER, BRO);
} else if ((buf[0] & 0x1) || GET_REGBIT(s, MODER, IAM)) {
unsigned mcast_idx = compute_mcast_idx(buf);
miss = !(s->regs[HASH0 + mcast_idx / 32] &
(1 << (mcast_idx % 32)));
trace_open_eth_receive_mcast(
mcast_idx, s->regs[HASH0], s->regs[HASH1]);
} else {
miss = GET_REGFIELD(s, MAC_ADDR1, BYTE0) != buf[0] ||
GET_REGFIELD(s, MAC_ADDR1, BYTE1) != buf[1] ||
GET_REGFIELD(s, MAC_ADDR0, BYTE2) != buf[2] ||
GET_REGFIELD(s, MAC_ADDR0, BYTE3) != buf[3] ||
GET_REGFIELD(s, MAC_ADDR0, BYTE4) != buf[4] ||
GET_REGFIELD(s, MAC_ADDR0, BYTE5) != buf[5];
}
}
if (miss && !GET_REGBIT(s, MODER, PRO)) {
trace_open_eth_receive_reject();
return size;
}
#ifdef USE_RECSMALL
if (GET_REGBIT(s, MODER, RECSMALL) || size >= minfl) {
#else
{
#endif
static const uint8_t zero[64] = {0};
desc *desc = rx_desc(s);
size_t copy_size = GET_REGBIT(s, MODER, HUGEN) ? 65536 : maxfl;
desc->len_flags &= ~(RXD_CF | RXD_M | RXD_OR |
RXD_IS | RXD_DN | RXD_TL | RXD_SF | RXD_CRC | RXD_LC);
if (copy_size > size) {
copy_size = size;
} else {
fcsl = 0;
}
if (miss) {
desc->len_flags |= RXD_M;
}
if (GET_REGBIT(s, MODER, HUGEN) && size > maxfl) {
desc->len_flags |= RXD_TL;
}
#ifdef USE_RECSMALL
if (size < minfl) {
desc->len_flags |= RXD_SF;
}
#endif
cpu_physical_memory_write(desc->buf_ptr, buf, copy_size);
if (GET_REGBIT(s, MODER, PAD) && copy_size < minfl) {
if (minfl - copy_size > fcsl) {
fcsl = 0;
} else {
fcsl -= minfl - copy_size;
}
while (copy_size < minfl) {
size_t zero_sz = minfl - copy_size < sizeof(zero) ?
minfl - copy_size : sizeof(zero);
cpu_physical_memory_write(desc->buf_ptr + copy_size,
zero, zero_sz);
copy_size += zero_sz;
}
}
/* There's no FCS in the frames handed to us by the QEMU, zero fill it.
* Don't do it if the frame is cut at the MAXFL or padded with 4 or
* more bytes to the MINFL.
*/
cpu_physical_memory_write(desc->buf_ptr + copy_size, zero, fcsl);
copy_size += fcsl;
SET_FIELD(desc->len_flags, RXD_LEN, copy_size);
if ((desc->len_flags & RXD_WRAP) || s->rx_desc == 0x7f) {
s->rx_desc = s->regs[TX_BD_NUM];
} else {
++s->rx_desc;
}
desc->len_flags &= ~RXD_E;
trace_open_eth_receive_desc(desc->buf_ptr, desc->len_flags);
if (desc->len_flags & RXD_IRQ) {
open_eth_int_source_write(s,
s->regs[INT_SOURCE] | INT_SOURCE_RXB);
}
}
return size;
}
static void open_eth_cleanup(NetClientState *nc)
{
}
static NetClientInfo net_open_eth_info = {
.type = NET_CLIENT_OPTIONS_KIND_NIC,
.size = sizeof(NICState),
.can_receive = open_eth_can_receive,
.receive = open_eth_receive,
.cleanup = open_eth_cleanup,
.link_status_changed = open_eth_set_link_status,
};
static void open_eth_start_xmit(OpenEthState *s, desc *tx)
{
uint8_t buf[65536];
unsigned len = GET_FIELD(tx->len_flags, TXD_LEN);
unsigned tx_len = len;
if ((tx->len_flags & TXD_PAD) &&
tx_len < GET_REGFIELD(s, PACKETLEN, MINFL)) {
tx_len = GET_REGFIELD(s, PACKETLEN, MINFL);
}
if (!GET_REGBIT(s, MODER, HUGEN) &&
tx_len > GET_REGFIELD(s, PACKETLEN, MAXFL)) {
tx_len = GET_REGFIELD(s, PACKETLEN, MAXFL);
}
trace_open_eth_start_xmit(tx->buf_ptr, len, tx_len);
if (len > tx_len) {
len = tx_len;
}
cpu_physical_memory_read(tx->buf_ptr, buf, len);
if (tx_len > len) {
memset(buf + len, 0, tx_len - len);
}
qemu_send_packet(qemu_get_queue(s->nic), buf, tx_len);
if (tx->len_flags & TXD_WR) {
s->tx_desc = 0;
} else {
++s->tx_desc;
if (s->tx_desc >= s->regs[TX_BD_NUM]) {
s->tx_desc = 0;
}
}
tx->len_flags &= ~(TXD_RD | TXD_UR |
TXD_RTRY | TXD_RL | TXD_LC | TXD_DF | TXD_CS);
if (tx->len_flags & TXD_IRQ) {
open_eth_int_source_write(s, s->regs[INT_SOURCE] | INT_SOURCE_TXB);
}
}
static void open_eth_check_start_xmit(OpenEthState *s)
{
desc *tx = tx_desc(s);
if (GET_REGBIT(s, MODER, TXEN) && s->regs[TX_BD_NUM] > 0 &&
(tx->len_flags & TXD_RD) &&
GET_FIELD(tx->len_flags, TXD_LEN) > 4) {
open_eth_start_xmit(s, tx);
}
}
static uint64_t open_eth_reg_read(void *opaque,
hwaddr addr, unsigned int size)
{
static uint32_t (*reg_read[REG_MAX])(OpenEthState *s) = {
};
OpenEthState *s = opaque;
unsigned idx = addr / 4;
uint64_t v = 0;
if (idx < REG_MAX) {
if (reg_read[idx]) {
v = reg_read[idx](s);
} else {
v = s->regs[idx];
}
}
trace_open_eth_reg_read((uint32_t)addr, (uint32_t)v);
return v;
}
static void open_eth_ro(OpenEthState *s, uint32_t val)
{
}
static void open_eth_moder_host_write(OpenEthState *s, uint32_t val)
{
uint32_t set = val & ~s->regs[MODER];
if (set & MODER_RST) {
open_eth_reset(s);
}
s->regs[MODER] = val;
if (set & MODER_RXEN) {
s->rx_desc = s->regs[TX_BD_NUM];
}
if (set & MODER_TXEN) {
s->tx_desc = 0;
open_eth_check_start_xmit(s);
}
}
static void open_eth_int_source_host_write(OpenEthState *s, uint32_t val)
{
uint32_t old = s->regs[INT_SOURCE];
s->regs[INT_SOURCE] &= ~val;
open_eth_update_irq(s, old & s->regs[INT_MASK],
s->regs[INT_SOURCE] & s->regs[INT_MASK]);
}
static void open_eth_int_mask_host_write(OpenEthState *s, uint32_t val)
{
uint32_t old = s->regs[INT_MASK];
s->regs[INT_MASK] = val;
open_eth_update_irq(s, s->regs[INT_SOURCE] & old,
s->regs[INT_SOURCE] & s->regs[INT_MASK]);
}
static void open_eth_mii_command_host_write(OpenEthState *s, uint32_t val)
{
unsigned fiad = GET_REGFIELD(s, MIIADDRESS, FIAD);
unsigned rgad = GET_REGFIELD(s, MIIADDRESS, RGAD);
if (val & MIICOMMAND_WCTRLDATA) {
if (fiad == DEFAULT_PHY) {
mii_write_host(&s->mii, rgad,
GET_REGFIELD(s, MIITX_DATA, CTRLDATA));
}
}
if (val & MIICOMMAND_RSTAT) {
if (fiad == DEFAULT_PHY) {
SET_REGFIELD(s, MIIRX_DATA, PRSD,
mii_read_host(&s->mii, rgad));
} else {
s->regs[MIIRX_DATA] = 0xffff;
}
SET_REGFIELD(s, MIISTATUS, LINKFAIL, qemu_get_queue(s->nic)->link_down);
}
}
static void open_eth_mii_tx_host_write(OpenEthState *s, uint32_t val)
{
SET_REGFIELD(s, MIITX_DATA, CTRLDATA, val);
if (GET_REGFIELD(s, MIIADDRESS, FIAD) == DEFAULT_PHY) {
mii_write_host(&s->mii, GET_REGFIELD(s, MIIADDRESS, RGAD),
GET_REGFIELD(s, MIITX_DATA, CTRLDATA));
}
}
static void open_eth_reg_write(void *opaque,
hwaddr addr, uint64_t val, unsigned int size)
{
static void (*reg_write[REG_MAX])(OpenEthState *s, uint32_t val) = {
[MODER] = open_eth_moder_host_write,
[INT_SOURCE] = open_eth_int_source_host_write,
[INT_MASK] = open_eth_int_mask_host_write,
[MIICOMMAND] = open_eth_mii_command_host_write,
[MIITX_DATA] = open_eth_mii_tx_host_write,
[MIISTATUS] = open_eth_ro,
};
OpenEthState *s = opaque;
unsigned idx = addr / 4;
if (idx < REG_MAX) {
trace_open_eth_reg_write((uint32_t)addr, (uint32_t)val);
if (reg_write[idx]) {
reg_write[idx](s, val);
} else {
s->regs[idx] = val;
}
}
}
static uint64_t open_eth_desc_read(void *opaque,
hwaddr addr, unsigned int size)
{
OpenEthState *s = opaque;
uint64_t v = 0;
addr &= 0x3ff;
memcpy(&v, (uint8_t *)s->desc + addr, size);
trace_open_eth_desc_read((uint32_t)addr, (uint32_t)v);
return v;
}
static void open_eth_desc_write(void *opaque,
hwaddr addr, uint64_t val, unsigned int size)
{
OpenEthState *s = opaque;
addr &= 0x3ff;
trace_open_eth_desc_write((uint32_t)addr, (uint32_t)val);
memcpy((uint8_t *)s->desc + addr, &val, size);
open_eth_check_start_xmit(s);
}
static const MemoryRegionOps open_eth_reg_ops = {
.read = open_eth_reg_read,
.write = open_eth_reg_write,
};
static const MemoryRegionOps open_eth_desc_ops = {
.read = open_eth_desc_read,
.write = open_eth_desc_write,
};
static int sysbus_open_eth_init(SysBusDevice *sbd)
{
DeviceState *dev = DEVICE(sbd);
OpenEthState *s = OPEN_ETH(dev);
memory_region_init_io(&s->reg_io, OBJECT(dev), &open_eth_reg_ops, s,
"open_eth.regs", 0x54);
sysbus_init_mmio(sbd, &s->reg_io);
memory_region_init_io(&s->desc_io, OBJECT(dev), &open_eth_desc_ops, s,
"open_eth.desc", 0x400);
sysbus_init_mmio(sbd, &s->desc_io);
sysbus_init_irq(sbd, &s->irq);
s->nic = qemu_new_nic(&net_open_eth_info, &s->conf,
object_get_typename(OBJECT(s)), dev->id, s);
return 0;
}
static void qdev_open_eth_reset(DeviceState *dev)
{
OpenEthState *d = OPEN_ETH(dev);
open_eth_reset(d);
}
static Property open_eth_properties[] = {
DEFINE_NIC_PROPERTIES(OpenEthState, conf),
DEFINE_PROP_END_OF_LIST(),
};
static void open_eth_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = sysbus_open_eth_init;
set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
dc->desc = "Opencores 10/100 Mbit Ethernet";
dc->reset = qdev_open_eth_reset;
dc->props = open_eth_properties;
}
static const TypeInfo open_eth_info = {
.name = TYPE_OPEN_ETH,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(OpenEthState),
.class_init = open_eth_class_init,
};
static void open_eth_register_types(void)
{
type_register_static(&open_eth_info);
}
type_init(open_eth_register_types)
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