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1// SPDX-License-Identifier: GPL-2.02#include <linux/mm_types.h>3#include <linux/maple_tree.h>4#include <linux/rwsem.h>5#include <linux/spinlock.h>6#include <linux/list.h>7#include <linux/cpumask.h>8#include <linux/mman.h>9#include <linux/pgtable.h>10 11#include <linux/atomic.h>12#include <linux/user_namespace.h>13#include <linux/iommu.h>14#include <asm/mmu.h>15 16#ifndef INIT_MM_CONTEXT17#define INIT_MM_CONTEXT(name)18#endif19 20const struct vm_operations_struct vma_dummy_vm_ops;21 22/*23 * For dynamically allocated mm_structs, there is a dynamically sized cpumask24 * at the end of the structure, the size of which depends on the maximum CPU25 * number the system can see. That way we allocate only as much memory for26 * mm_cpumask() as needed for the hundreds, or thousands of processes that27 * a system typically runs.28 *29 * Since there is only one init_mm in the entire system, keep it simple30 * and size this cpu_bitmask to NR_CPUS.31 */32struct mm_struct init_mm = {33 .mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),34 .pgd = swapper_pg_dir,35 .mm_users = ATOMIC_INIT(2),36 .mm_count = ATOMIC_INIT(1),37 .write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),38 MMAP_LOCK_INITIALIZER(init_mm)39 .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),40 .arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),41 .mmlist = LIST_HEAD_INIT(init_mm.mmlist),42#ifdef CONFIG_PER_VMA_LOCK43 .mm_lock_seq = 0,44#endif45 .user_ns = &init_user_ns,46 .cpu_bitmap = CPU_BITS_NONE,47 INIT_MM_CONTEXT(init_mm)48};49 50void setup_initial_init_mm(void *start_code, void *end_code,51 void *end_data, void *brk)52{53 init_mm.start_code = (unsigned long)start_code;54 init_mm.end_code = (unsigned long)end_code;55 init_mm.end_data = (unsigned long)end_data;56 init_mm.brk = (unsigned long)brk;57}58