1 // SPDX-License-Identifier: GPL-2.0 2 #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_CONTEXT 17 #define INIT_MM_CONTEXT(name) 18 #endif 19 20 const struct vm_operations_struct vma_dummy_vm_ops; 21 22 /* 23 * For dynamically allocated mm_structs, there is a dynamically sized cpumask 24 * at the end of the structure, the size of which depends on the maximum CPU 25 * number the system can see. That way we allocate only as much memory for 26 * mm_cpumask() as needed for the hundreds, or thousands of processes that 27 * a system typically runs. 28 * 29 * Since there is only one init_mm in the entire system, keep it simple 30 * and size this cpu_bitmask to NR_CPUS. 31 */ 32 struct 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_LOCK 43 .mm_lock_seq = 0, 44 #endif 45 .user_ns = &init_user_ns, 46 .cpu_bitmap = CPU_BITS_NONE, 47 INIT_MM_CONTEXT(init_mm) 48 }; 49 50 void 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