// SPDX-License-Identifier: GPL-2.0

  #include <linux/init_task.h>
  #include <linux/export.h>
  #include <linux/mqueue.h>
  #include <linux/sched.h>

  #include <linux/sched/sysctl.h>

  #include <linux/sched/rt.h>

  #include <linux/sched/task.h>

  #include <linux/init.h>
  #include <linux/fs.h>
  #include <linux/mm.h>

  #include <linux/audit.h>

  
  #include <asm/pgtable.h>

  #include <linux/uaccess.h>

  static struct signal_struct init_signals = {
  	.nr_threads	= 1,
  	.thread_head	= LIST_HEAD_INIT(init_task.thread_node),
  	.wait_chldexit	= __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
  	.shared_pending	= {
  		.list = LIST_HEAD_INIT(init_signals.shared_pending.list),
  		.signal =  {{0}}
  	},

  	.multiprocess	= HLIST_HEAD_INIT,

  	.rlim		= INIT_RLIMITS,
  	.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
  #ifdef CONFIG_POSIX_TIMERS
  	.posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
  	.cputimer	= {
  		.cputime_atomic	= INIT_CPUTIME_ATOMIC,
  		.running	= false,
  		.checking_timer = false,
  	},
  #endif
  	INIT_CPU_TIMERS(init_signals)

  	.pids = {
  		[PIDTYPE_PID]	= &init_struct_pid,

  		[PIDTYPE_TGID]	= &init_struct_pid,

  		[PIDTYPE_PGID]	= &init_struct_pid,
  		[PIDTYPE_SID]	= &init_struct_pid,
  	},

  	INIT_PREV_CPUTIME(init_signals)
  };
  
  static struct sighand_struct init_sighand = {
  	.count		= ATOMIC_INIT(1),
  	.action		= { { { .sa_handler = SIG_DFL, } }, },
  	.siglock	= __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
  	.signalfd_wqh	= __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
  };

  /*
   * Set up the first task table, touch at your own risk!. Base=0,
   * limit=0x1fffff (=2MB)
   */

  struct task_struct init_task
  #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
  	__init_task_data
  #endif

  = {

  #ifdef CONFIG_THREAD_INFO_IN_TASK
  	.thread_info	= INIT_THREAD_INFO(init_task),
  	.stack_refcount	= ATOMIC_INIT(1),
  #endif

  	.state		= 0,
  	.stack		= init_stack,
  	.usage		= ATOMIC_INIT(2),
  	.flags		= PF_KTHREAD,

  	.prio		= MAX_PRIO - 20,
  	.static_prio	= MAX_PRIO - 20,
  	.normal_prio	= MAX_PRIO - 20,

  	.policy		= SCHED_NORMAL,
  	.cpus_allowed	= CPU_MASK_ALL,
  	.nr_cpus_allowed= NR_CPUS,
  	.mm		= NULL,
  	.active_mm	= &init_mm,

  	.restart_block	= {

  		.fn = do_no_restart_syscall,
  	},
  	.se		= {
  		.group_node 	= LIST_HEAD_INIT(init_task.se.group_node),
  	},
  	.rt		= {
  		.run_list	= LIST_HEAD_INIT(init_task.rt.run_list),
  		.time_slice	= RR_TIMESLICE,
  	},
  	.tasks		= LIST_HEAD_INIT(init_task.tasks),

  #ifdef CONFIG_SMP
  	.pushable_tasks	= PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
  #endif
  #ifdef CONFIG_CGROUP_SCHED
  	.sched_task_group = &root_task_group,
  #endif

  	.ptraced	= LIST_HEAD_INIT(init_task.ptraced),
  	.ptrace_entry	= LIST_HEAD_INIT(init_task.ptrace_entry),
  	.real_parent	= &init_task,
  	.parent		= &init_task,
  	.children	= LIST_HEAD_INIT(init_task.children),
  	.sibling	= LIST_HEAD_INIT(init_task.sibling),
  	.group_leader	= &init_task,
  	RCU_POINTER_INITIALIZER(real_cred, &init_cred),
  	RCU_POINTER_INITIALIZER(cred, &init_cred),
  	.comm		= INIT_TASK_COMM,
  	.thread		= INIT_THREAD,
  	.fs		= &init_fs,
  	.files		= &init_files,
  	.signal		= &init_signals,
  	.sighand	= &init_sighand,
  	.nsproxy	= &init_nsproxy,
  	.pending	= {
  		.list = LIST_HEAD_INIT(init_task.pending.list),
  		.signal = {{0}}
  	},
  	.blocked	= {{0}},
  	.alloc_lock	= __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
  	.journal_info	= NULL,
  	INIT_CPU_TIMERS(init_task)
  	.pi_lock	= __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
  	.timer_slack_ns = 50000, /* 50 usec default slack */

  	.thread_pid	= &init_struct_pid,

  	.thread_group	= LIST_HEAD_INIT(init_task.thread_group),
  	.thread_node	= LIST_HEAD_INIT(init_signals.thread_head),

  #ifdef CONFIG_AUDITSYSCALL
  	.loginuid	= INVALID_UID,

  	.sessionid	= AUDIT_SID_UNSET,

  #endif
  #ifdef CONFIG_PERF_EVENTS
  	.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
  	.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
  #endif
  #ifdef CONFIG_PREEMPT_RCU
  	.rcu_read_lock_nesting = 0,
  	.rcu_read_unlock_special.s = 0,
  	.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
  	.rcu_blocked_node = NULL,
  #endif
  #ifdef CONFIG_TASKS_RCU
  	.rcu_tasks_holdout = false,
  	.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
  	.rcu_tasks_idle_cpu = -1,
  #endif
  #ifdef CONFIG_CPUSETS
  	.mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
  #endif
  #ifdef CONFIG_RT_MUTEXES
  	.pi_waiters	= RB_ROOT_CACHED,
  	.pi_top_task	= NULL,
  #endif

  	INIT_PREV_CPUTIME(init_task)

  #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
  	.vtime.seqcount	= SEQCNT_ZERO(init_task.vtime_seqcount),
  	.vtime.starttime = 0,
  	.vtime.state	= VTIME_SYS,
  #endif
  #ifdef CONFIG_NUMA_BALANCING
  	.numa_preferred_nid = -1,
  	.numa_group	= NULL,
  	.numa_faults	= NULL,
  #endif
  #ifdef CONFIG_KASAN
  	.kasan_depth	= 1,
  #endif
  #ifdef CONFIG_TRACE_IRQFLAGS
  	.softirqs_enabled = 1,
  #endif
  #ifdef CONFIG_LOCKDEP
  	.lockdep_recursion = 0,
  #endif
  #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  	.ret_stack	= NULL,
  #endif
  #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
  	.trace_recursion = 0,
  #endif
  #ifdef CONFIG_LIVEPATCH
  	.patch_state	= KLP_UNDEFINED,
  #endif
  #ifdef CONFIG_SECURITY
  	.security	= NULL,
  #endif

  };

  EXPORT_SYMBOL(init_task);
  
  /*
   * Initial thread structure. Alignment of this is handled by a special
   * linker map entry.
   */

  #ifndef CONFIG_THREAD_INFO_IN_TASK

  struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);

  #endif