// SPDX-License-Identifier: GPL-2.0
#include <linux/mm_types.h>
#include <linux/maple_tree.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/cpumask.h>
#include <linux/mman.h>
#include <linux/pgtable.h>

#include <linux/atomic.h>
#include <linux/user_namespace.h>
#include <linux/iommu.h>
#include <asm/mmu.h>

#ifndef INIT_MM_CONTEXT
#define INIT_MM_CONTEXT(name)
#endif

const struct vm_operations_struct vma_dummy_vm_ops;

/*
 * For dynamically allocated mm_structs, there is a dynamically sized cpumask
 * at the end of the structure, the size of which depends on the maximum CPU
 * number the system can see. That way we allocate only as much memory for
 * mm_cpumask() as needed for the hundreds, or thousands of processes that
 * a system typically runs.
 *
 * Since there is only one init_mm in the entire system, keep it simple
 * and size this cpu_bitmask to NR_CPUS.
 */
struct mm_struct init_mm = {
        .mm_mt          = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),
        .pgd            = swapper_pg_dir,
        .mm_users       = ATOMIC_INIT(2),
        .mm_count       = ATOMIC_INIT(1),
        .write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
        MMAP_LOCK_INITIALIZER(init_mm)
        .page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
        .arg_lock       =  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
        .mmlist         = LIST_HEAD_INIT(init_mm.mmlist),
#ifdef CONFIG_PER_VMA_LOCK
        .vma_writer_wait = __RCUWAIT_INITIALIZER(init_mm.vma_writer_wait),
        .mm_lock_seq    = SEQCNT_ZERO(init_mm.mm_lock_seq),
#endif
        .user_ns        = &init_user_ns,
#ifdef CONFIG_SCHED_MM_CID
        .mm_cid.lock = __RAW_SPIN_LOCK_UNLOCKED(init_mm.mm_cid.lock),
#endif
        .flexible_array = MM_STRUCT_FLEXIBLE_ARRAY_INIT,
        INIT_MM_CONTEXT(init_mm)
};

void setup_initial_init_mm(void *start_code, void *end_code,
                           void *end_data, void *brk)
{
        init_mm.start_code = (unsigned long)start_code;
        init_mm.end_code = (unsigned long)end_code;
        init_mm.end_data = (unsigned long)end_data;
        init_mm.brk = (unsigned long)brk;
}