blob: 9aa3179c388153cbe2ca567238a69122caa6d90e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY UCLASS_BOOTSTD
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <bootstd.h>
#include <dm.h>
#include <env_internal.h>
#include <malloc.h>
#include <serial.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
/* error codes used to signal running out of things */
enum {
BF_NO_MORE_PARTS = -ESHUTDOWN,
BF_NO_MORE_DEVICES = -ENODEV,
};
/**
* bootflow_state - name for each state
*
* See enum bootflow_state_t for what each of these means
*/
static const char *const bootflow_state[BOOTFLOWST_COUNT] = {
"base",
"media",
"part",
"fs",
"file",
"ready",
};
const char *bootflow_state_get_name(enum bootflow_state_t state)
{
/* This doesn't need to be a useful name, since it will never occur */
if (state < 0 || state >= BOOTFLOWST_COUNT)
return "?";
return bootflow_state[state];
}
int bootflow_first_glob(struct bootflow **bflowp)
{
struct bootstd_priv *std;
int ret;
ret = bootstd_get_priv(&std);
if (ret)
return ret;
if (list_empty(&std->glob_head))
return -ENOENT;
*bflowp = list_first_entry(&std->glob_head, struct bootflow,
glob_node);
return 0;
}
int bootflow_next_glob(struct bootflow **bflowp)
{
struct bootstd_priv *std;
struct bootflow *bflow = *bflowp;
int ret;
ret = bootstd_get_priv(&std);
if (ret)
return ret;
*bflowp = NULL;
if (list_is_last(&bflow->glob_node, &std->glob_head))
return -ENOENT;
*bflowp = list_entry(bflow->glob_node.next, struct bootflow, glob_node);
return 0;
}
void bootflow_iter_init(struct bootflow_iter *iter, int flags)
{
memset(iter, '\0', sizeof(*iter));
iter->first_glob_method = -1;
iter->flags = flags;
/* remember the first bootdevs we see */
iter->max_devs = BOOTFLOW_MAX_USED_DEVS;
}
void bootflow_iter_uninit(struct bootflow_iter *iter)
{
free(iter->method_order);
}
int bootflow_iter_drop_bootmeth(struct bootflow_iter *iter,
const struct udevice *bmeth)
{
/* We only support disabling the current bootmeth */
if (bmeth != iter->method || iter->cur_method >= iter->num_methods ||
iter->method_order[iter->cur_method] != bmeth)
return -EINVAL;
memmove(&iter->method_order[iter->cur_method],
&iter->method_order[iter->cur_method + 1],
(iter->num_methods - iter->cur_method - 1) * sizeof(void *));
iter->num_methods--;
return 0;
}
/**
* bootflow_iter_set_dev() - switch to the next bootdev when iterating
*
* This sets iter->dev, records the device in the dev_used[] list and shows a
* message if required
*
* @iter: Iterator to update
* @dev: Bootdev to use, or NULL if there are no more
*/
static void bootflow_iter_set_dev(struct bootflow_iter *iter,
struct udevice *dev, int method_flags)
{
struct bootmeth_uc_plat *ucp = dev_get_uclass_plat(iter->method);
log_debug("iter: Setting dev to %s, flags %x\n",
dev ? dev->name : "(none)", method_flags);
iter->dev = dev;
iter->method_flags = method_flags;
if (IS_ENABLED(CONFIG_BOOTSTD_FULL)) {
/* record the device for later */
if (dev && iter->num_devs < iter->max_devs)
iter->dev_used[iter->num_devs++] = dev;
if ((iter->flags & (BOOTFLOWIF_SHOW | BOOTFLOWIF_SINGLE_DEV)) ==
BOOTFLOWIF_SHOW) {
if (dev)
printf("Scanning bootdev '%s':\n", dev->name);
else if (IS_ENABLED(CONFIG_BOOTMETH_GLOBAL) &&
ucp->flags & BOOTMETHF_GLOBAL)
printf("Scanning global bootmeth '%s':\n",
iter->method->name);
else
printf("No more bootdevs\n");
}
}
}
/**
* scan_next_in_uclass() - Scan for the next bootdev in the same media uclass
*
* Move through the following bootdevs until we find another in this media
* uclass, or run out
*
* @devp: On entry, the device to check, on exit the new device, or NULL if
* there is none
*/
static void scan_next_in_uclass(struct udevice **devp)
{
struct udevice *dev = *devp;
enum uclass_id cur_id = device_get_uclass_id(dev->parent);
do {
uclass_find_next_device(&dev);
} while (dev && cur_id != device_get_uclass_id(dev->parent));
*devp = dev;
}
/**
* iter_incr() - Move to the next item (method, part, bootdev)
*
* Return: 0 if OK, BF_NO_MORE_DEVICES if there are no more bootdevs
*/
static int iter_incr(struct bootflow_iter *iter)
{
struct udevice *dev;
bool inc_dev = true;
bool global;
int ret;
log_debug("entry: err=%d\n", iter->err);
global = iter->doing_global;
if (iter->err == BF_NO_MORE_DEVICES)
return BF_NO_MORE_DEVICES;
if (iter->err != BF_NO_MORE_PARTS) {
/* Get the next boothmethod */
if (++iter->cur_method < iter->num_methods) {
iter->method = iter->method_order[iter->cur_method];
return 0;
}
/*
* If we have finished scanning the global bootmeths, start the
* normal bootdev scan
*/
if (IS_ENABLED(CONFIG_BOOTMETH_GLOBAL) && global) {
iter->num_methods = iter->first_glob_method;
iter->doing_global = false;
/*
* Don't move to the next dev as we haven't tried this
* one yet!
*/
inc_dev = false;
}
}
if (iter->flags & BOOTFLOWIF_SINGLE_PARTITION)
return BF_NO_MORE_DEVICES;
/* No more bootmeths; start at the first one, and... */
iter->cur_method = 0;
iter->method = iter->method_order[iter->cur_method];
if (iter->err != BF_NO_MORE_PARTS) {
/* ...select next partition */
if (++iter->part <= iter->max_part)
return 0;
}
/* No more partitions; start at the first one and... */
iter->part = 0;
/*
* Note: as far as we know, there is no partition table on the next
* bootdev, so set max_part to 0 until we discover otherwise. See
* bootdev_find_in_blk() for where this is set.
*/
iter->max_part = 0;
/* ...select next bootdev */
if (iter->flags & BOOTFLOWIF_SINGLE_DEV) {
ret = -ENOENT;
} else {
int method_flags;
ret = 0;
dev = iter->dev;
log_debug("inc_dev=%d\n", inc_dev);
if (!inc_dev) {
ret = bootdev_setup_iter(iter, NULL, &dev,
&method_flags);
} else if (IS_ENABLED(CONFIG_BOOTSTD_FULL) &&
(iter->flags & BOOTFLOWIF_SINGLE_UCLASS)) {
scan_next_in_uclass(&dev);
if (!dev) {
log_debug("finished uclass %s\n",
dev_get_uclass_name(dev));
ret = -ENODEV;
}
} else if (IS_ENABLED(CONFIG_BOOTSTD_FULL) &&
iter->flags & BOOTFLOWIF_SINGLE_MEDIA) {
log_debug("next in single\n");
method_flags = 0;
do {
/*
* Move to the next bootdev child of this media
* device. This ensures that we cover all the
* available SCSI IDs and LUNs.
*/
device_find_next_child(&dev);
log_debug("- next %s\n",
dev ? dev->name : "(none)");
} while (dev && device_get_uclass_id(dev) !=
UCLASS_BOOTDEV);
if (!dev) {
log_debug("finished uclass %s\n",
dev_get_uclass_name(dev));
ret = -ENODEV;
}
} else {
log_debug("labels %p\n", iter->labels);
if (iter->labels) {
/*
* when the label is "mmc" we want to scan all
* mmc bootdevs, not just the first. See
* bootdev_find_by_label() where this flag is
* set up
*/
if (iter->method_flags &
BOOTFLOW_METHF_SINGLE_UCLASS) {
scan_next_in_uclass(&dev);
log_debug("looking for next device %s: %s\n",
iter->dev->name,
dev ? dev->name : "<none>");
} else {
dev = NULL;
}
if (!dev) {
log_debug("looking at next label\n");
ret = bootdev_next_label(iter, &dev,
&method_flags);
}
} else {
ret = bootdev_next_prio(iter, &dev);
method_flags = 0;
}
}
log_debug("ret=%d, dev=%p %s\n", ret, dev,
dev ? dev->name : "none");
if (ret) {
bootflow_iter_set_dev(iter, NULL, 0);
} else {
/*
* Probe the bootdev. This does not probe any attached
* block device, since they are siblings
*/
ret = device_probe(dev);
log_debug("probe %s %d\n", dev->name, ret);
if (!log_msg_ret("probe", ret))
bootflow_iter_set_dev(iter, dev, method_flags);
}
}
/* if there are no more bootdevs, give up */
if (ret)
return log_msg_ret("incr", BF_NO_MORE_DEVICES);
return 0;
}
/**
* bootflow_check() - Check if a bootflow can be obtained
*
* @iter: Provides part, bootmeth to use
* @bflow: Bootflow to update on success
* Return: 0 if OK, -ENOSYS if there is no bootflow support on this device,
* BF_NO_MORE_PARTS if there are no more partitions on bootdev
*/
static int bootflow_check(struct bootflow_iter *iter, struct bootflow *bflow)
{
struct udevice *dev;
int ret;
if (IS_ENABLED(CONFIG_BOOTMETH_GLOBAL) && iter->doing_global) {
bootflow_iter_set_dev(iter, NULL, 0);
ret = bootmeth_get_bootflow(iter->method, bflow);
if (ret)
return log_msg_ret("glob", ret);
return 0;
}
dev = iter->dev;
ret = bootdev_get_bootflow(dev, iter, bflow);
/* If we got a valid bootflow, return it */
if (!ret) {
log_debug("Bootdev '%s' part %d method '%s': Found bootflow\n",
dev->name, iter->part, iter->method->name);
return 0;
}
/* Unless there is nothing more to try, move to the next device */
if (ret != BF_NO_MORE_PARTS && ret != -ENOSYS) {
log_debug("Bootdev '%s' part %d method '%s': Error %d\n",
dev->name, iter->part, iter->method->name, ret);
/*
* For 'all' we return all bootflows, even
* those with errors
*/
if (iter->flags & BOOTFLOWIF_ALL)
return log_msg_ret("all", ret);
}
return log_msg_ret("check", ret);
}
int bootflow_scan_first(struct udevice *dev, const char *label,
struct bootflow_iter *iter, int flags,
struct bootflow *bflow)
{
int ret;
if (dev || label)
flags |= BOOTFLOWIF_SKIP_GLOBAL;
bootflow_iter_init(iter, flags);
/*
* Set up the ordering of bootmeths. This sets iter->doing_global and
* iter->first_glob_method if we are starting with the global bootmeths
*/
ret = bootmeth_setup_iter_order(iter, !(flags & BOOTFLOWIF_SKIP_GLOBAL));
if (ret)
return log_msg_ret("obmeth", -ENODEV);
/* Find the first bootmeth (there must be at least one!) */
iter->method = iter->method_order[iter->cur_method];
if (!IS_ENABLED(CONFIG_BOOTMETH_GLOBAL) || !iter->doing_global) {
struct udevice *dev = NULL;
int method_flags;
ret = bootdev_setup_iter(iter, label, &dev, &method_flags);
if (ret)
return log_msg_ret("obdev", -ENODEV);
bootflow_iter_set_dev(iter, dev, method_flags);
}
ret = bootflow_check(iter, bflow);
if (ret) {
log_debug("check - ret=%d\n", ret);
if (ret != BF_NO_MORE_PARTS && ret != -ENOSYS) {
if (iter->flags & BOOTFLOWIF_ALL)
return log_msg_ret("all", ret);
}
iter->err = ret;
ret = bootflow_scan_next(iter, bflow);
if (ret)
return log_msg_ret("get", ret);
}
return 0;
}
int bootflow_scan_next(struct bootflow_iter *iter, struct bootflow *bflow)
{
int ret;
do {
ret = iter_incr(iter);
log_debug("iter_incr: ret=%d\n", ret);
if (ret == BF_NO_MORE_DEVICES)
return log_msg_ret("done", ret);
if (!ret) {
ret = bootflow_check(iter, bflow);
log_debug("check - ret=%d\n", ret);
if (!ret)
return 0;
iter->err = ret;
if (ret != BF_NO_MORE_PARTS && ret != -ENOSYS) {
if (iter->flags & BOOTFLOWIF_ALL)
return log_msg_ret("all", ret);
}
} else {
log_debug("incr failed, err=%d\n", ret);
iter->err = ret;
}
} while (1);
}
void bootflow_init(struct bootflow *bflow, struct udevice *bootdev,
struct udevice *meth)
{
memset(bflow, '\0', sizeof(*bflow));
bflow->dev = bootdev;
bflow->method = meth;
bflow->state = BOOTFLOWST_BASE;
}
void bootflow_free(struct bootflow *bflow)
{
free(bflow->name);
free(bflow->subdir);
free(bflow->fname);
if (!(bflow->flags & BOOTFLOWF_STATIC_BUF))
free(bflow->buf);
free(bflow->os_name);
free(bflow->fdt_fname);
free(bflow->bootmeth_priv);
}
void bootflow_remove(struct bootflow *bflow)
{
if (bflow->dev)
list_del(&bflow->bm_node);
list_del(&bflow->glob_node);
bootflow_free(bflow);
free(bflow);
}
#if CONFIG_IS_ENABLED(BOOTSTD_FULL)
int bootflow_read_all(struct bootflow *bflow)
{
int ret;
if (bflow->state != BOOTFLOWST_READY)
return log_msg_ret("rd", -EPROTO);
ret = bootmeth_read_all(bflow->method, bflow);
if (ret)
return log_msg_ret("rd2", ret);
return 0;
}
#endif /* BOOTSTD_FULL */
int bootflow_boot(struct bootflow *bflow)
{
int ret;
if (bflow->state != BOOTFLOWST_READY)
return log_msg_ret("load", -EPROTO);
ret = bootmeth_boot(bflow->method, bflow);
if (ret)
return log_msg_ret("boot", ret);
/*
* internal error, should not get here since we should have booted
* something or returned an error
*/
return log_msg_ret("end", -EFAULT);
}
int bootflow_run_boot(struct bootflow_iter *iter, struct bootflow *bflow)
{
int ret;
printf("** Booting bootflow '%s' with %s\n", bflow->name,
bflow->method->name);
if (IS_ENABLED(CONFIG_OF_HAS_PRIOR_STAGE) &&
(bflow->flags & BOOTFLOWF_USE_PRIOR_FDT))
printf("Using prior-stage device tree\n");
ret = bootflow_boot(bflow);
if (!IS_ENABLED(CONFIG_BOOTSTD_FULL)) {
printf("Boot failed (err=%d)\n", ret);
return ret;
}
switch (ret) {
case -EPROTO:
printf("Bootflow not loaded (state '%s')\n",
bootflow_state_get_name(bflow->state));
break;
case -ENOSYS:
printf("Boot method '%s' not supported\n", bflow->method->name);
break;
case -ENOTSUPP:
/* Disable this bootflow for this iteration */
if (iter) {
int ret2;
ret2 = bootflow_iter_drop_bootmeth(iter, bflow->method);
if (!ret2) {
printf("Boot method '%s' failed and will not be retried\n",
bflow->method->name);
}
}
break;
default:
printf("Boot failed (err=%d)\n", ret);
break;
}
return ret;
}
int bootflow_iter_check_blk(const struct bootflow_iter *iter)
{
const struct udevice *media = dev_get_parent(iter->dev);
enum uclass_id id = device_get_uclass_id(media);
log_debug("uclass %d: %s\n", id, uclass_get_name(id));
if (id != UCLASS_ETH && id != UCLASS_BOOTSTD && id != UCLASS_QFW)
return 0;
return -ENOTSUPP;
}
int bootflow_iter_check_sf(const struct bootflow_iter *iter)
{
const struct udevice *media = dev_get_parent(iter->dev);
enum uclass_id id = device_get_uclass_id(media);
log_debug("uclass %d: %s\n", id, uclass_get_name(id));
if (id == UCLASS_SPI_FLASH)
return 0;
return -ENOTSUPP;
}
int bootflow_iter_check_net(const struct bootflow_iter *iter)
{
const struct udevice *media = dev_get_parent(iter->dev);
enum uclass_id id = device_get_uclass_id(media);
log_debug("uclass %d: %s\n", id, uclass_get_name(id));
if (id == UCLASS_ETH)
return 0;
return -ENOTSUPP;
}
int bootflow_iter_check_system(const struct bootflow_iter *iter)
{
const struct udevice *media = dev_get_parent(iter->dev);
enum uclass_id id = device_get_uclass_id(media);
log_debug("uclass %d: %s\n", id, uclass_get_name(id));
if (id == UCLASS_BOOTSTD)
return 0;
return -ENOTSUPP;
}
/**
* bootflow_cmdline_set() - Set the command line for a bootflow
*
* @value: New command-line string
* Returns 0 if OK, -ENOENT if no current bootflow, -ENOMEM if out of memory
*/
int bootflow_cmdline_set(struct bootflow *bflow, const char *value)
{
char *cmdline = NULL;
if (value) {
cmdline = strdup(value);
if (!cmdline)
return -ENOMEM;
}
free(bflow->cmdline);
bflow->cmdline = cmdline;
return 0;
}
#ifdef CONFIG_BOOTSTD_FULL
/**
* on_bootargs() - Update the cmdline of a bootflow
*/
static int on_bootargs(const char *name, const char *value, enum env_op op,
int flags)
{
struct bootstd_priv *std;
struct bootflow *bflow;
int ret;
ret = bootstd_get_priv(&std);
if (ret)
return 0;
bflow = std->cur_bootflow;
if (!bflow)
return 0;
switch (op) {
case env_op_create:
case env_op_overwrite:
ret = bootflow_cmdline_set(bflow, value);
if (ret && ret != ENOENT)
return 1;
return 0;
case env_op_delete:
bootflow_cmdline_set(bflow, NULL);
fallthrough;
default:
return 0;
}
}
U_BOOT_ENV_CALLBACK(bootargs, on_bootargs);
#endif
/**
* copy_in() - Copy a string into a cmdline buffer
*
* @buf: Buffer to copy into
* @end: End of buffer (pointer to char after the end)
* @arg: String to copy from
* @len: Number of chars to copy from @arg (note that this is not usually the
* sane as strlen(arg) since the string may contain following arguments)
* @new_val: Value to put after arg, or BOOTFLOWCL_EMPTY to use an empty value
* with no '=' sign
* Returns: Number of chars written to @buf
*/
static int copy_in(char *buf, char *end, const char *arg, int len,
const char *new_val)
{
char *to = buf;
/* copy the arg name */
if (to + len >= end)
return -E2BIG;
memcpy(to, arg, len);
to += len;
if (new_val == BOOTFLOWCL_EMPTY) {
/* no value */
} else {
bool need_quote = strchr(new_val, ' ');
len = strlen(new_val);
/* need space for value, equals sign and maybe two quotes */
if (to + 1 + (need_quote ? 2 : 0) + len >= end)
return -E2BIG;
*to++ = '=';
if (need_quote)
*to++ = '"';
memcpy(to, new_val, len);
to += len;
if (need_quote)
*to++ = '"';
}
return to - buf;
}
int cmdline_set_arg(char *buf, int maxlen, const char *cmdline,
const char *set_arg, const char *new_val, int *posp)
{
bool found_arg = false;
const char *from;
char *to, *end;
int set_arg_len;
char empty = '\0';
int ret;
from = cmdline ?: &empty;
/* check if the value has quotes inside */
if (new_val && new_val != BOOTFLOWCL_EMPTY && strchr(new_val, '"'))
return -EBADF;
set_arg_len = strlen(set_arg);
for (to = buf, end = buf + maxlen; *from;) {
const char *val, *arg_end, *val_end, *p;
bool in_quote;
if (to >= end)
return -E2BIG;
while (*from == ' ')
from++;
if (!*from)
break;
/* find the end of this arg */
val = NULL;
arg_end = NULL;
val_end = NULL;
in_quote = false;
for (p = from;; p++) {
if (in_quote) {
if (!*p)
return -EINVAL;
if (*p == '"')
in_quote = false;
continue;
}
if (*p == '=' && !arg_end) {
arg_end = p;
val = p + 1;
} else if (*p == '"') {
in_quote = true;
} else if (!*p || *p == ' ') {
val_end = p;
if (!arg_end)
arg_end = p;
break;
}
}
/*
* At this point val_end points to the end of the value, or the
* last char after the arg name, if there is no label.
* arg_end is the char after the arg name
* val points to the value, or NULL if there is none
* char after the value.
*
* fred=1234
* ^ ^^ ^
* from || |
* / \ \
* arg_end val val_end
*/
log_debug("from %s arg_end %ld val %ld val_end %ld\n", from,
(long)(arg_end - from), (long)(val - from),
(long)(val_end - from));
if (to != buf) {
if (to >= end)
return -E2BIG;
*to++ = ' ';
}
/* if this is the target arg, update it */
if (arg_end - from == set_arg_len &&
!strncmp(from, set_arg, set_arg_len)) {
if (!buf) {
bool has_quote = val_end[-1] == '"';
/*
* exclude any start/end quotes from
* calculations
*/
if (!val)
val = val_end;
*posp = val - cmdline + has_quote;
return val_end - val - 2 * has_quote;
}
found_arg = true;
if (!new_val) {
/* delete this arg */
from = val_end + (*val_end == ' ');
log_debug("delete from: %s\n", from);
if (to != buf)
to--; /* drop the space we added */
continue;
}
ret = copy_in(to, end, from, arg_end - from, new_val);
if (ret < 0)
return ret;
to += ret;
/* if not the target arg, copy it unchanged */
} else if (to) {
int len;
len = val_end - from;
if (to + len >= end)
return -E2BIG;
memcpy(to, from, len);
to += len;
}
from = val_end;
}
/* If we didn't find the arg, add it */
if (!found_arg) {
/* trying to delete something that is not there */
if (!new_val || !buf)
return -ENOENT;
if (to >= end)
return -E2BIG;
/* add a space to separate it from the previous arg */
if (to != buf && to[-1] != ' ')
*to++ = ' ';
ret = copy_in(to, end, set_arg, set_arg_len, new_val);
log_debug("ret=%d, to: %s buf: %s\n", ret, to, buf);
if (ret < 0)
return ret;
to += ret;
}
/* delete any trailing space */
if (to > buf && to[-1] == ' ')
to--;
if (to >= end)
return -E2BIG;
*to++ = '\0';
return to - buf;
}
int bootflow_cmdline_set_arg(struct bootflow *bflow, const char *set_arg,
const char *new_val, bool set_env)
{
char buf[2048];
char *cmd = NULL;
int ret;
ret = cmdline_set_arg(buf, sizeof(buf), bflow->cmdline, set_arg,
new_val, NULL);
if (ret < 0)
return ret;
ret = bootflow_cmdline_set(bflow, buf);
if (*buf) {
cmd = strdup(buf);
if (!cmd)
return -ENOMEM;
}
free(bflow->cmdline);
bflow->cmdline = cmd;
if (set_env) {
ret = env_set("bootargs", bflow->cmdline);
if (ret)
return ret;
}
return 0;
}
int cmdline_get_arg(const char *cmdline, const char *arg, int *posp)
{
int ret;
ret = cmdline_set_arg(NULL, 1, cmdline, arg, NULL, posp);
return ret;
}
int bootflow_cmdline_get_arg(struct bootflow *bflow, const char *arg,
const char **val)
{
int ret;
int pos;
ret = cmdline_get_arg(bflow->cmdline, arg, &pos);
if (ret < 0)
return ret;
*val = bflow->cmdline + pos;
return ret;
}
int bootflow_cmdline_auto(struct bootflow *bflow, const char *arg)
{
struct serial_device_info info;
char buf[50];
int ret;
ret = serial_getinfo(gd->cur_serial_dev, &info);
if (ret)
return ret;
*buf = '\0';
if (!strcmp("earlycon", arg)) {
snprintf(buf, sizeof(buf),
"uart8250,mmio32,%#lx,%dn8", info.addr,
info.baudrate);
} else if (!strcmp("console", arg)) {
snprintf(buf, sizeof(buf),
"ttyS0,%dn8", info.baudrate);
}
if (!*buf) {
printf("Unknown param '%s\n", arg);
return -ENOENT;
}
ret = bootflow_cmdline_set_arg(bflow, arg, buf, true);
if (ret)
return ret;
return 0;
}